Linear Bushings. Description of each series and Table of dimensions

Transcription

1 Linear Bushins escription of each series and Table of dimensions Linear Bushin G Pae - to -9 Linear Bushin Pae - to -7 ompact Linear Bushin Pae -7 to -77 Miniature Linear Bushin Pae -7 to - In the table of dimensions, standard products are referred to usin identification numbers marked with. The identification numbers marked with refer to our semi-standard products.

2 Linear Bushin G is a hih load capacity type linear motion rollin uide which achieves endless linear motion of an external cylinder alon a shaft with rooved raceways. It is a very simple and compact linear bushin with a lare load capacity. Interchaneable Linear Bushin G G Solid shaft and hollow shaft U.S. PATT Linear Bushin G series Linear Bushin G shape Solid shaft Model code G The dimensional accuracy of the external cylinder and that of the shaft with rooved raceways are controlled individually to ensure interchaneability, so that they can be combined, added or exchaned freely. The shaft with rooved raceways can be selected from two types: the solid shaft type G and the hollow shaft type GT. The hollow shaft type is suitable for applications in which pipin, wirin or ventilation is needed. Hollow shaft GT Hih load capacity Two rows of steel balls are incorporated in the external cylinder and make contact with rooved raceways of the shaft to obtain hih riidity and hih load capacity. imensionally interchaneable with Linear Bushin Linear Bushin G is dimensionally interchaneable with Linear Bushin and it is easy to chane from one to another. Identification number and specification The specification of Linear Bushin G is indicated by the identification number, consistin of a model code, a size, a part code and any supplemental codes. U.S. PATT o.,9, xternal cylinder G / with rooved raceways G T R Assembled set G T R / with rooved raceways xternal cylinder xternal cylinder body Steel ball Series Shape of shaft Model code G Rin Retainer nd plate Size of rollin uide Size Stop rin umber of external cylinders Lenth of shaft Part code Structure of Linear Bushin G Special specification Supplemental code =.kf=.lbs. - =.97inch -

3 Series G Special specification xternal cylinder with shell type flane With end seals U Special specification is applicable to all models and sizes. When a combination of several special specifications is required, arrane their supplemental codes in alphabetical order. Shape of shaft Solid shaft Hollow shaft o symbol T xternal cylinder with shell type flane When a flaned external cylinder is required, this type can be used. A shell type flane is formed by precision drawin of thin steel plate. Size of rollin uide Indicate the shaft in. Table imensions of the external cylinder with shell type flane L T umber of external cylinders Assembled set xternal cylinder only or an assembled set, indicate the number of external cylinders assembled on one shaft with rooved raceways. or an external cylinder, only "" can be indicated. d pcd unit : L T d pcd Lenth of shaft Assembled set only R R Indicate the lenth of shaft with rooved raceways in. or standard and maximum lenths, see the table of dimensions. G G G GT GT GT G GT... G GT... G GT... With end sealsu To prevent intrusion of forein matter, end seals are mounted at both ends of the external cylinder. nd seal nd seal G =.kf=.lbs. - =.97inch -

4 Ratin Accuracy The load ratins of Linear Bushin G are defined for downward load. Suarized descriptions of load ratins are iven below. or details of load ratin definitions and load calculations, see "General description". load ratin The basic dynamic load ratin is defined as the constant load both in direction and manitude under which a roup of identical Linear Bushins G are individually operated and 9% of the units in the roup can travel x meters free from material damae due to rollin contact fatiue. load ratin The basic static load ratin is defined as the static load that ives a prescribed constant contact stress at the center of the contact area between the rollin element and raceway receivin the maximum load. ynamic torque ratin T The dynamic torque ratin is defined as the constant torque both in direction and manitude under which a roup of identical Linear Bushins G are individually operated and 9% of the units in the roup can travel x meters free from material damae due to rollin contact fatiue. The accuracy of Linear Bushin G is shown in the dimension table. The allowable value for the total radial runout of axial line of the shaft with rooved raceways is shown in Table. The allowable value for the twist of rooves with respect to effective lenth of shaft with rooved raceways is m for any lenth of over the entire effective lenth of raceway. Measurin methods of accuracy are shown in Table. Table Total radial runout of axial line of shaft with rooved raceways Overall lenth of shaft over incl. G GT G GT G GT Remark : These values are applicable when the radial internal clearance is m. G GT G GT 7 unit : m G GT Static torque ratin T direction and load ratin The static torque ratin is defined as the static torque that ives a prescribed constant contact stress at the center of the contact area between the rollin element and raceway receivin the maximum load., T, T i. irections of load ratin and torque ratin Since the load ratins of Linear Bushin G iven in the table of dimensions are for downward load, they must be corrected for the load direction for upward or lateral load. The corrected basic dynamic load ratins and basic static load ratins are shown in Table. Table direction and load ratin Upward load ownward load Lateral load Table Measurin methods of accuracy Item Measurin method Illustrations of measurin method Twist of rooves with respect to effective lenth of the shaft with rooved raceways ix and support the shaft. Then apply a uni-directional torsional moment on the external cylinder before placin a dial ae probe at riht anles to the shaft aainst the side face of the measurin block attached on the external cylinder. Measure runout when the external cylinder and the ae have traveled toether millimeters on any effective part of the raceway rooves. In the measurement, the probe should be applied as near as possible to the outer surface of the external cylinder. Measurin block atum block for travelin of ae G ratin ynamic load ratin direction ownward Upward Lateral. Static load ratin.7 Total radial runout of axial line of shaft with rooved raceways (See Table.) While supportin the shaft at its supportin parts or at both center holes, place a dial ae probe to the outer surface of external cylinder, and measure runout at several positions in the axial direction while turnin the shaft one rotation. Use the maximum value. =.kf=.lbs. - =.97inch -

5 Radial Internal learance The radial internal clearance of Linear Bushin G is approx. m. In the shell flane type, radial internal clearance is slihtly smaller than that of standard type. Moment of Inertia of Sectional Area and Section Modulus of with Grooved Raceways Moment of inertia of sectional area and section modulus of the shaft with rooved raceways are shown in Table. Table Moment of inertia of sectional area and section modulus it Precautions for Mountin The normal fit between the external cylinder of Linear Bushin G and the housin is recoended to be a clearance fit (H7). But, in special cases, a transition fit (J7) may be used. In case of the external cylinder with shell type flane, a clearance of over. based on the nominal outside is required. Mountin To mount Linear Bushin G, the external cylinder should be press fitted carefully with proper tools usin, for example, a press machine. Mountin examples are shown in i.. G GT G GT G G G G GT GT GT GT Moment of inertia of sectional area Section modulus Solid shaft Hollow shaft Solid shaft Hollow shaft i. Mountin examples of external cylinder Precautions for Use Accessories Lubrication Both rease and oil lubrication are applicable. In case of rease lubrication, use of quality lithium-soap base rease is recoended for eneral applications. ixin depth of mountin bolt of external cylinder The fixin depth of mountin bolt of external cylinder should be less than the maximum depth shown in the dimension table. The fixin female thread hole in the external cylinder is a throuh hole. Therefore, if the fixin depth of mountin bolt is too lare, the mountin bolt will contact and push the shaft, and accuracy and life will be affected adversely. Support Block Support blocks are prepared for supportin the ends of "shaft with rooved raceways" of Linear Bushin G. or details, consult. G Multiple external cylinders in close distance When two or more external cylinders (standard or with shell type flane) are used in close distance in the same housin, the distance between the centers of external cylinders should be over three times of the lenth of external cylinders. If the external cylinders are used in close distance, consult. Operation with rotational torque In case a bi-directional and/or repeated rotational torque is applied, select Linear Ball Spline G. =.kf=.lbs. - =.97inch -7

6 Solid shaftg Hollow shaftgt Linear Bushin G Mdepth d K d L Bore dia. of hollow shaft Interchaneable xternal cylinder ( ) ominal dimensions and tolerances Mdepth( ) d d( ) K L Maximum lenth load ratin load ratin ynamic torque ratin( ) T Static torque ratin( ) T G GT M..9 (.) G GT M. () G GT M. () G GT M. (.) G GT M. (.) G GT M. (.) ote( ) : iures shown in this column are the mass per of shaft. ( ) : The values in parentheses indicate the max. fixin depth of mountin bolt. ( ) : imension d indicates the maximum when machinin is done at the shaft ends. ( ) : iures shown in T and T columns are applicable when a uni-directional torque is applied. In case a bi-directional and/or repeated rotational torque is applied, select Linear Ball Spline G. Remark : All Linear Bushin G series are interchaneable specification products. G =.kf=.lbs. - =.97inch -9

7 LBLBLBBB Linear Bushin is a hih precision linear motion rollin uide which travels alon a shaft to achieve endless linear motion. In the external cylinder, a retainer, steel balls, etc. are compactly incorporated. Wide variations in size are available for selections suitable for each application. Low frictional linear motion Linear Bushin Steel balls are accurately uided by a retainer, so low frictional resistance and stable linear motion can be achieved. Simple replacement of conventional plain bushins It is easy to use Linear Bushins instead of conventional plain bushins, because both types are used with a round shaft, and no major redesin is necessary. Wide variations or each dimensional series, standard, adjustable clearance and open types are available with and without seals, so the best linear bushin for the application may be selected. Stainless steel type Linear Bushins made of stainless steel are also available. This type is suitable for applications where corrosion resistance is important. Linear Bushin series imension series Metric series xternal cylinder shape Adjustable clearance type Sealin Without end seals With two end seals Without end seals With two end seals Without end seals Model code LB LB LB LB LB AJ LB AJ AJ AJ AJ AJ LB AJ LB AJ AJ AJ AJ AJ LB OP LB OP OP OP OP OP xternal cylinder Retainer Linear Bushin Adjustable clearance type With two end seals Without end seals With two end seals Without end seals LB OP LB OP OP OP OP OP LBB B LBB LBB AJ B AJ LB, LB, LBB,,, B Inch series Steel ball With two end seals LBB AJ Without end seals With two end seals LBB OP B OP LBB OP Structure of Linear Bushin Remark : "" in the model code indicates that it is stainless steel type. =.kf=.lbs. - =.97inch -

8 Identification number and specification The specification of Linear Bushin is indicated by the identification number, consistin of a model code, a size, a material symbol, a part code, a shape code and a classification symbol. LB series LB OP Lenth of external cylinder or the metric series, indicate the lenth of the external cylinder in. or the inch series, indicate the lenth of external cylinder in the unit of / inch. Series series Model code 9 9 AJ P Retainer material arbon steel made o symbol Synthetic resin made In case of series, specify the retainer material. or applicable models and sizes, see the "Model number" column in the table of dimensions on paes - to -7. The maximum operatin temperature for the synthetic resin type is. ontinuous operation is possible at temperatures up to. In all of LB series, the retainer is made of synthetic resin. Inscribed circle Outside of external cylinder Size Material Hih carbon steel made o symbol Stainless steel made Specify the component part material. or applicable models and sizes, see the "" column in the table of dimensions on paes - to -7. Lenth of external cylinder Retainer material Material Sealin 7 xternal cylinder shape Accuracy 9 class Series Material symbol Part code Shape code lassification symbol Inscribed circle Outside of external cylinder Metric series LB, LB,, Inch series LBB, B or the metric series, indicate the inscribed circle in. or the inch series, indicate the inscribed circle in the unit of / inch. or the metric series, indicate the outside of external cylinder in. or the inch series, indicate the outside of external cylinder in the unit of / inch. 7 Sealin Without end seal With two end seals xternal cylinder shape Adjustable clearance type AJ See "xternal cylinder shape" shown below. OP xternal cylinder shape This type is widely used as a eneral purpose linear uide. Hih and precision classes are available. o symbol Adjustable clearance type A slot in a lonitudinal direction is made on the external cylinder in order to adjust the clearance. When this type is used with a housin which can adjust the bore, the radial internal clearance can be adjusted without fit selection between the linear bushin and shaft. It is possible to ive a preload. 9 Accuracy class Hih o symbol o symbol P The two seal types incorporate seals with superior dust protection performance at both ends of the external cylinder for preventin intrusion of forein matter. The maximum allowable temperature for seals is. This type has one or two fewer ball circuits than the standard type, creatin an open section to allow clearance for a shaft support. The open type bushin is coonly used with lon shafts when one or more support blocks are needed to reduce shaft deflection or sa. The width of the support blocks can be determined to match the () dimension of fan shaped open section shown in the table of dimensions. The radial internal clearance can also be adjusted. or details of accuracy, see the table of dimensions on paes - to -7. Hih class and precision class are available for the LB, LBB, and B standard type series. or the adjustable clearance type and the open type, only hih class is available, and the accuracy values are applicable only before cuttin the external cylinders. LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

9 Ratin Precautions for Use Suarized descriptions of load ratins of Linear Bushin are iven below. or details of load ratin definitions and load calculations, see "General description". load ratin The basic dynamic load ratin is defined as the constant load both in direction and manitude under which a roup of identical Linear Bushins are individually operated and 9% of the units in the roup can travel x meters free from material damae due to rollin contact fatiue. learance Adjustable clearance and open type Linear Bushins can be adjusted for radial internal clearance if they are used with a housin which can adjust the bore. However, if the deree of the adjustment is excessive, deformation at the contact points between steel balls and shaft or external cylinder becomes lare, resultin in short life. Therefore, it is recoended to prepare a shaft with a specified fit tolerance and adjust the radial internal clearance to zero or minimal preload by matchin the individual components. The clearance is adjusted while checkin with a dial ae. The adjustment is enerally completed when the shaft is rotated in an unloaded condition and liht resistance is caused by the rotation of shaft. In this condition, the radial internal clearance becomes zero or minimal preload. or open type Linear Bushins havin three rows of ball circuits, clearance adjustment can not be made. load ratin The basic static load ratin is defined as the static load that ives a prescribed constant contact stress at the center of the contact area between the rollin element and raceway receivin the maximum load. Relationships between load ratins and the position of ball circuits ratins of Linear Bushin are affected by the position of the ball circuits. In the table of dimensions, two types of load ratins are shown correspondin to the load directions and steel ball circuit positions as shown in i. and i.. In i. the load direction is in line with the steel ball circuit position and this direction is referred to as load in the table of dimensions. In eneral, the load ratins for this direction are also used, when the load direction is indeterminate or the steel ball circuit position in relation to the load direction cannot be determined. In i., the load direction is pointed at the center of two ball circuits and this direction is referred to as load in the table of dimensions. In eneral, a larer load can be received in this case compared with load. i. i. i. xample of clearance adjustment Raceway surface Since Linear Bushins operate with a shaft as a raceway surface, the shaft should be heat-treated and round. Recoended surface hardness and rouhness of the shaft are shown in Table, and also recoended minimum effective hardenin depth of the raceway is shown in Table. Table Surface hardness and rouhness of raceway Item Recoended value Remarks Surface hardness Surface rouhness HR.mRa or better (.mry or better) When the raceway hardness is less than the necessary hardness, multiply load ratins by the hardness factor. When the required accuracy is not severe, a surface rouhness of about.mra (.mry) is adequate. Table Minimum effective hardenin depth over incl. unit : Recoended minimum effective hardenin depth.... LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

10 Lubrication Linear Bushins can be used with oil or rease lubrication. A ood quality lithium-soap base rease is recoended for rease lubrication. When rotational motion is present Linear Bushins can only be operated in linear motion and can not be rotated. When linear motion in short stroke lenth and rotation are both required, Stroke Rotary Bushin (See pae -7.) is recoended. If linear motion in lon stroke lenth and rotation are both required, a combination of Linear Bushin and eedle Roller Bearin as shown in i. is recoended. it Precautions for Mountin Table shows the recoended fit tolerances for Linear Bushin. The fit between Linear Bushin and housin is usually clearance fit. or some special applications, an interference fit may be required. or adjustable clearance or open type Linear Bushins, the followin recoendations apply. The shaft is finished smaller than the lower limit of the tolerance rane of the inscribed circle of the Linear Bushin, while the housin is finished larer than the upper limit of the tolerance rane of the outside of the external cylinder of the Linear Bushin. Table Recoended fit tolerance Spacer Shell type eedle Roller Bearin Stop rin Item Housin Type ormal clearance loser clearance learance fit Interference fit LB, LBB, B LB, Hih class class f, f, h h h j H7 H H7 J7 J J7 Mountin i. xample of confiuration for lon stroke linear motion and rotation Precaution for use of Linear Bushin havin three rows of ball circuits Linear Bushins havin three rows of ball circuits can be used only for the load direction shown in i.. If two Linear Bushins are used in parallel, by considerin the load distribution, the arranement shown in i. is recoended. This type can not be adjusted for radial internal clearance. When press-fittin the Linear Bushin into the housin, do not hit the end plate. The correct method is to radually push the external cylinder with a ji for assemblin. (See i. 7.) Then the external cylinder is fixed in the axial direction with a stop rin or a stopper plate. When insertin the shaft into the Linear Bushin assembled into a housin, radually and ently insert a shaft avoidin to ive impact on the steel balls and retainers. If two shafts are used in parallel, fix one shaft accurately as a datum shaft and locate the second shaft to the datum shaft keepin the parallelism. i. shows an example of eneral assemblin. -. w-. i. 7 LB, LB, LBB,,, B i. i. i. xample of assemblin =.kf=.lbs. - =.97inch -7

11 Accessories Table imensions of felt seals for Linear Bushin Steel shaft for Linear Bushin In order to achieve full performance of Linear Bushin, heat-treated and round steel shafts with hih accuracy are available. oercial shafts can also be delivered upon request. or details, consult. B support block Support blocks are prepared for supportin the ends of shaft for Linear Bushin. or details, consult. elt seals for Linear Bushin elt seals are available for Linear Bushin without end seal. If dust protection and minimal frictional resistance in linear motion are both required, felt seals are recoended. imensions of felt seals are shown in Table. d d B 9 9 unit : Remark : These felt seals are used with or LB models. or other models and types, consult for details. LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -9

12 Linear Bushin : Metric series : LB Adjustable clearance type : LBAJ : LBOP h LB LBAJ LBOP LB LB LB LB LB LB LB LB LB Adjustable clearance type LB LB AJ AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB OP LB OP LB OP LB OP LB OP LB OP LB OP w m m 9 ominal dimensions and tolerances m h m eree ccentricity Max. m 7 load ratin load ratin Preferable circlip LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

13 Linear Bushin with Seals : Metric series : LB Adjustable clearance type : LB AJ : LB OP h LB LB AJ LB OP LB LB LB LB LB LB LB LB LB Adjustable clearance type LB LB AJ AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB AJ LB OP LB OP LB OP LB OP LB OP LB OP LB OP w m m 9 ominal dimensions and tolerances m h m eree ccentricity Max. m 7 load ratin load ratin Preferable circlip LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

14 Linear Bushin : Metric series : LB Adjustable clearance type : LBAJ : LBOP h LB LBAJ LBOP LB. Adjustable clearance type LB AJ. w m Hih m 9 ominal dimensions and tolerances m ( ) h m eree.... ccentricity Max. m Hih load ratin 7.. load ratin LB LB LB LB LB LB LB LB LB LB LB S LB S AJ LB AJ LB LB LB LB LB LB LB LB LB AJ AJ AJ AJ AJ AJ AJ AJ AJ LB OP LB OP LB OP LB OP LB OP LB OP LB OP LB OP LB OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

15 Linear Bushin with Seals : Metric series : LB Adjustable clearance type : LB AJ : LB OP h LB LB AJ LB OP LB. Adjustable clearance type LB AJ. w m Hih m 9 ominal dimensions and tolerances m ( ) h m eree.... ccentricity Max. m Hih load ratin 7.. load ratin LB S LB LB LB LB LB LB LB LB LB LB..... LB S AJ LB AJ LB LB LB LB LB LB LB LB LB AJ AJ AJ AJ AJ AJ AJ AJ AJ LB OP LB OP LB OP LB OP LB OP LB OP LB OP LB OP LB OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -7

16 Linear Bushin : Inch series : LBB Adjustable clearance type : LBBAJ : LBBOP h LBB LBBAJ LBBOP (inch). ( /) 9. ( /).7 ( /).7 ( /) 9. ( /). ().7 ( /). ( /). () LBB LBB LBB LBB LBB LBB LBB LBB LBB Bal circuits Adjustable clearance type LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ. 7. LBB OP LBB OP LBB OP LBB OP LBB OP LBB OP LBB OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. w m /. / 9. /.7 /.7 / /.7 7 /. 9. ccentricity Max. m Hih m / /.7 / 9. 7/.7 7/. /. /.7 /.7 /. / / 9.. /. 7. / 7. / ominal dimensions and tolerances m ( ) h m eree / /. 7.9 / / / 7/ / 9/ /. 7. /.7 9. / / / load ratin load ratin LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -9

17 Linear Bushin with Seals : Inch series : LBB Adjustable clearance type : LBB AJ : LBB OP h LBB LBB AJ LBB OP (inch). ( /) 9. ( /).7 ( /).7 ( /) 9. ( /). ().7 ( /). ( /). () LBB LBB LBB LBB LBB LBB LBB LBB LBB 7.. Adjustable clearance type LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ LBB AJ. LBB 79 OP LBB OP LBB OP LBB OP LBB OP LBB OP LBB OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class w m /. / 9. /.7 /.7 / 9.. /.7 /.. ccentricity Max. m Hih m / /.7 / 9. 7/.7 7/. /. /.7 /.7 /. / / 9.. /. 7. / 7. / ominal dimensions and tolerances m ( ) h m eree / /. 7.9 / / / 7/ / 9/ /. 7. /.7 9. / / / load ratin load ratin LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

18 Linear Bushin : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP AJ Adjustable clearance type 7. ominal dimensions and tolerances m Tolerancancance Toler- w ( ) Toler- Hih m m m 9... Max. h m erecision Pre- Hih ccentricity load ratin load ratin AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 9 AJ 9 AJ OP OP OP OP OP 7 OP 7 OP OP OP 9 OP 9 OP LB, LB, LBB,,, B 9 AJ AJ OP OP AJ 7 AJ AJ AJ 79 7 OP 7 OP OP OP AJ AJ 7 OP OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. : The end plate for the standard type and the adjustable clearance type with a shaft of or less is fixed usin a stop rin for hole =.kf=.lbs. - =.97inch -

19 Linear Bushin : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP 9 9 Adjustable clearance type 9 AJ 9 AJ AJ 9 9 OP 9 OP OP 7 m w Hih 9 9 ominal dimensions and tolerances.... ( ) m m m ccentricity load ratin Max. h m erecision Hih Pre load ratin AJ AJ AJ ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. OP OP OP LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

20 Linear Bushin with Seals : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP Adjustable clearance type 9 AJ 7. m w Hih ominal dimensions and tolerances 9... ( ) m m m ccentricity Max. h m eree Hih load ratin load ratin AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 9 AJ 9 AJ OP OP OP OP OP 7 OP 7 OP OP OP 9 OP 9 OP LB, LB, LBB,,, B 9 AJ AJ OP OP AJ 7 AJ AJ AJ 79 7 OP 7 OP OP OP AJ AJ 7 OP OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. : The end plate for the standard type and the adjustable clearance type with a shaft of or less is fixed usin a stop rin for hole =.kf=.lbs. - =.97inch -7

21 Linear Bushin with Seals : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP 9 9 Adjustable clearance type 9 AJ 9 AJ AJ 9 9 OP 9 OP OP 7 w ominal dimensions and tolerances m ( ) h Hih m m m eree ccentricity load ratin Max. m Hih load ratin AJ AJ AJ OP OP OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -9

22 Linear Bushin : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ AJ AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 7 AJ 7 AJ 9 AJ 9 AJ AJ OP OP OP OP OP OP OP OP 7 OP 7 OP OP OP 7 OP 7 OP 9 OP 9 OP OP w m ( ) m m m ominal dimensions and tolerances h eree 7 7 ccentricity Max. m 7 load ratin load ratin LB, LB, LBB,,, B ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. =.kf=.lbs. - =.97inch -

23 Linear Bushin with Seals : Metric series : Adjustable clearance type : AJ (Synthetic resin retainer) AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ AJ AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 7 AJ 7 AJ 9 AJ 9 AJ AJ OP OP OP OP OP OP OP OP 7 OP 7 OP OP OP 7 OP 7 OP 9 OP 9 OP OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : Seals of the Linear Bushins marked with an asterisk (*) protrude a little from the end face of external cylinder. w m ( ) m m m ominal dimensions and tolerances h Max. eree m ccentricity 7 load ratin load ratin LB, LB, LBB,,, B =.kf=.lbs. - =.97inch -

24 Linear Bushin : Inch series : B B(Synthetic resin retainer) Adjustable clearance type : BAJ B AJ(Synthetic resin retainer) : BOP B OP(Synthetic resin retainer) h B BAJ BOP inch. ( /) B B 9.. B AJ Adjustable clearance type. w /. ( ) m m m m Hih /.7 ominal dimensions and tolerances / h eree ccentricity Max. m Hih load ratin ( ). ( ) 7. load ratin ( ) ( ) 9. ( /).7 ( /) B B B B 7.. B AJ B AJ B AJ B OP B OP. / / /.7 7 /. 7 / / ( /) 9. ( /). ().7 ( /). ( /). () B B B B B B B B B B B B B AJ B AJ B AJ B AJ B AJ B AJ B AJ B AJ B AJ B AJ B AJ B AJ B OP B OP B OP B OP B OP B OP B OP B OP B OP B OP B OP B OP /.7 / 9.. /.7 /.. 7 / / / 9.. / / / / / LB, LB, LBB,,, B. ( /) 7. (). () B B 79 B 9 B AJ B 79 AJ B 9 AJ 9 B OP B 79 OP B 9 OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. ( ) : The load ratin for three rows of ball circuits is shown as a representative value. Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. 7 9 / / / =.kf=.lbs. - =.97inch -

25 Stainless Steel Linear Bushin : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ 7 AJ AJ 9 99 OP AJ OP. AJ OP 9 AJ OP AJ OP AJ 77 7 OP AJ 7 OP AJ 9 OP 9 AJ 9 OP 9 9 AJ 9 OP 9 9 AJ 9 OP 9 AJ OP AJ OP 7 7 AJ 7 OP AJ 7 OP AJ OP AJ 79 OP 7 AJ OP AJ OP 9 9 AJ 9 9 OP 9 9 AJ 9 OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub ( ) m m m Max. h m erecision Pre- Hih =.kf=.lbs. - =.97inch -7 w m Hih ominal dimensions and tolerances ccentricity 7 load ratin load ratin Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. : The end plate for the standard type and the adjustable clearance type with a shaft of or less is fixed usin a stop rin for hole. LB, LB, LBB,,, B

26 Stainless Steel Linear Bushin with Seals : Metric series : Adjustable clearance type : : AJ OP (Synthetic resin retainer) AJ(Synthetic resin retainer) OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ 7 AJ AJ 9 99 OP AJ OP. AJ OP 9 AJ OP AJ OP AJ 77 7 OP AJ 7 OP AJ 9 OP 9 AJ 9 OP 9 9 AJ 9 OP 9 9 AJ 9 OP 9 AJ OP AJ OP 7 7 AJ 7 OP AJ 7 OP AJ AJ AJ 9 9 OP OP OP 9 9 AJ AJ AJ 79 9 OP OP OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub =.kf=.lbs. - =.97inch -9 w m Hih ominal dimensions and tolerances ) ( m m m ccentricity Max. h m eree Hih load ratin load ratin Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class. : The end plate for the standard type and the adjustable clearance type with a shaft of or less is fixed usin a stop rin for hole. LB, LB, LBB,,, B

27 Stainless Steel Linear Bushin : Metric series : (Synthetic resin retainer) Adjustable clearance type : AJ AJ(Synthetic resin retainer) : OP OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ AJ AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 7 AJ 7 AJ OP OP OP OP OP OP OP OP 7 OP 7 OP OP OP 7 OP 7 OP w m ( ) m m m ominal dimensions and tolerances h Max. eree m ccentricity 7 load ratin load ratin LB, LB, LBB,,, B AJ 9 AJ 7 9 OP 9 OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. =.kf=.lbs. -7 =.97inch -7

28 Stainless Steel Linear Bushin with Seals : Metric series : Adjustable clearance type : : AJ OP (Synthetic resin retainer) AJ(Synthetic resin retainer) OP(Synthetic resin retainer) h AJ OP Adjustable clearance type AJ AJ AJ AJ AJ AJ AJ AJ AJ AJ 7 AJ 7 AJ AJ AJ 7 AJ 7 AJ OP OP OP OP OP OP OP OP 7 OP 7 OP OP OP 7 OP 7 OP w m ( ) m m m ominal dimensions and tolerances h Max. eree m ccentricity 7 load ratin load ratin LB, LB, LBB,,, B AJ 9 AJ 9 OP 9 OP ote( ) : When circlips are used for mountin, the dimension minus twice the width of circlip becomes the width of hub. Remark : Seals of the Linear Bushins marked with an asterisk (*) protrude a little from the end face of external cylinder. =.kf=.lbs. -7 =.97inch -7

29 ompact Linear Bushin LK Identification umber LK Series LK ompact Linear Bushin is a linear motion rollin uide, incorporatin steel balls and a retainer compactly in an external cylinder which is made from a thin special-steel plate by precision drawin, carburizin and quenchin. ompact Linear Bushin can be used to reatly reduce the size and weiht of linear motion part of machines, because its sectional heiht is as small as to and it is mounted directly on the shaft which is used as the raceway. Steel balls are uided accurately by the retainer, so frictional resistance is small and a hihly accurate linear motion can be obtained. ompact Linear Bushin is tihtly fitted in the housin bore with an interference, so it is not necessary to fix it axially and handlin is easy. Series Size Sealin Model code Part code Raceway surface Since the shaft surface is used as a raceway for ompact Linear Bushin, the shaft must be heat-treated and round. Recoended surface hardness and rouhness of the shaft are shown in Table. Table Surface hardness and rouhness of shaft Item Surface hardness Recoended value HR LK LK Surface rouhness( ).mra or less.mry or less) ote( ) : In case hih accuracy is not required,.mra(.mry) can be used. xternal Retainer cylinder Steel ball Seal LK Structure of ompact Linear Bushin =.kf=.lbs. -7 =.97inch -7

30 it The correct dimensions and accuracy ompact Linear Bushin are obtained only after it has been pressfitted into the housin bore. As the external cylinder is thin, accuracy is directly affected by the dimensions, shape and riidity of housin, so these factors must be examined carefully. The recoended fit is shown in Table. ompact Linear Bushin : LK With seals : LK Table Recoended fit. Housin material class of shaft ormal clearance loser clearance class of housin bore ormal clearance loser clearance Steel, ast iron Liht alloy h h j j H 7 K 7 H K w Mountin Oil hole in the housin ompact Linear Bushin should be press-fitted into the housin ently, usin an appropriate tool as shown in i. with its marked and face up. As the external cylinder is thin, it must never be stuck directly with a haer. Since the external cylinder of ompact Linear Bushin is firmly press-fitted into the housin bore,it is not necessary to fix it axially. Marked end -. dia- LK Identification umber umber of ball circuits Weiht (Reference). Sealed type LK umber of ball circuits Weiht (Reference). Boundary dimensions () load ratin( ) load ratin( ) 9 LK 9. LK. 7 LK. LK. 9 LK 7. LK w-. ote( ) : The seal end of sealed type slihtly protrudes from the end face of external cylinder. ( ) : The load directions A and B are shown in the sketches below. i. xample of mountin tool LK =.kf=.lbs. -7 =.97inch -77

31 Miniature Linear Bushin S Miniature Linear Bushin is a miniature type linear motion rollin uide which travels alon a shaft to achieve endless linear motion. The shaft is. In the external cylinder of Miniature Linear Bushin, a retainer, steel balls and stop rins are compactly incorporated, and precise positionin accuracy can be obtained. Miniature Linear Bushin series Lenth of external cylinder Sealin Model code Standard Without seal S S Low frictional linear motion Steel balls are accurately uided by a retainer, so low frictional resistance and stable linear motion can be achieved. ompact desin Wide variations In addition to the standard type, the hih-riidity lon type is available. These types can be selected to suit the requirements in applications. Stainless steel type Miniature Linear Bushin With end seals S S Miniature Linear Bushin is very small in size, allowin for compact assembly in machines and equipment. Miniature Linear Bushins made of stainless steel are also available. This type is suitable for applications where corrosion resistance is important. Hih riidity lon Without seal SL SL With end seals SL SL Retainer Steel ball xternal cylinder S Structure of Miniature Linear Bushin Remark : "" in the model codes indicates a stainless steel type. =.kf=.lbs. -7 =.97inch -79

32 Identification number and specification The specification of Miniature Linear Bushin is indicated by the identification number, consistin of a model code, a size, a material symbol, a part code and a classification symbol. Series S S S P L Lenth of external cylinder Standard Hih riidity lon : L : o symbol Series Model code Inscribed circle Indicate the inscribed circle in. Lenth of external cylinder Inscribed circle Size Material Hih carbon steel made : o symbol Stainless steel made : Specify the component part material. Material Material symbol Sealin Accuracy class Part code lassification symbol Sealin Accuracy class Without seal : o symbol With two end seals : Hih : o symbol : P Sealed type incorporates seals with superior dust protection performance in both ends of the external cylinder for preventin intrusion of forein matter. or details of accuracy, see the table of dimensions on pae -. The precision class is applicable to standard type only. When strict control of radial internal clearance is required, specially controlled products of which inscribed circle is selected within the divisions of every. can be delivered. If required, consult. S =.kf=.lbs. - =.97inch -

33 Ratin Precautions for Use Suarized descriptions of load ratins of Miniature Linear Bushin are iven below. or details of load ratin definitions and load calculations, see "General description". load ratin The basic dynamic load ratin is defined as the constant load both in direction and manitude under which a roup of identical Miniature Linear Bushins are individually operated and 9% of the units in the roup can travel x meters free from material damae due to rollin contact fatiue. load ratin The basic static load ratin is defined as the static load that ives a prescribed constant contact stress at the center of the contact area between the rollin element and raceway receivin the maximum load. Raceway surface Since Miniature Linear Bushins operate with a shaft as a raceway surface, the shaft should be heat-treated and round. Recoended surface hardness, rouhness and minimum effective hardenin depth of the shaft are shown in Table. Table Surface hardness, rouhness and minimum effective hardenin depth Item Surface hardness Surface rouhness ffective hardenin depth Recoended value HR.mRa or better.mry or better). or more Remark When the raceway hardness is less than the necessary hardness, multiply load ratins by the hardness factor. Relationships between load ratins and the position of ball circuits ratins of Miniature Linear Bushin are affected by the position of the ball circuits. In the table of dimensions, two types of load ratins are shown correspondin to the load directions and steel ball circuit positions as shown in i. and i.. In i. the load direction is in line with the steel ball circuit position and this direction is referred to as load in the table of dimensions. In eneral, the load ratins for this direction are also used, when the load direction is indeterminate or the steel ball circuit position in relation to the load direction cannot be determined. In i., the load direction is pointed at the center of two ball circuits and this direction is referred to as load in the table of dimensions. In eneral, a larer load can be received in this case compared with load. Lubrication Miniature Linear Bushin can be used with oil or rease lubrication. It is a coon practice to apply rease lihtly on the shaft surface and steel balls for rease lubrication. A ood quality lithium-soap base rease is recoended for rease lubrication. When rotational motion is present Miniature Linear Bushin can only be operated in linear motion and can not be rotated. When linear motion in short stroke lenth and rotation are both required, Miniature Stroke Rotary Bushin (See pae -.) is recoended. Insertion of shaft When Miniature Linear Bushin is assembled with the shaft, do not insert the shaft with anle. It is possible that the steel balls will fall out or the retainer will be deformed and smooth operation can not be obtained. S i. i. =.kf=.lbs. - =.97inch -

34 it Precautions for Mountin Table shows the recoended fit tolerances for Miniature Linear Bushin. Thickness of external cylinder is very thin. Therefore, when fittin it into the housin, epoxy type adhesive is recoended for fixin the external cylinder in the housin. o not apply press fittin. Standard : S Hih riidity lon :SL Miniature Linear Bushin Table Recoended fit tolerance ( of shaft and housin bore) lass Item Housin unit : m S S SL SL Hih class class S S SL SL Accessories Steel shaft for Miniature Linear Bushin In order to achieve full performance of Miniature Linear Bushin, heat-treated and round steel shafts with hih accuracy and riidity are available. or details, consult. S S S S SL SL SL SL S S S S SL SL SL SL S S S S SL SL SL SL ominal dimensions and tolerances m Hih m Hih Remark : In the tolerance and eccentricity columns, "" refers to precision class and "Hih" refers to hih class m ccentricity Max. m Hih load ratin load ratin S =.kf=.lbs. - =.97inch -