6. Gear Units with Input Options

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1 AD input shaft assembly Helical gear unit with AD input shaft assembly SEW Helical, parallel shaft helical, helical-bevel and helical-worm gear units are equipped with an input shaft assembly. The input shafts have inch dimensions. Metric dimensions are provided on request. The end of the input shaft has a tapped hole to aid in mounting drive components. The bearings of the input shaft are lubricated by grease. Natural Buna Rubber oil seals and o-ring seals are used for sealing the cover. The rugged bearings of the input shaft permit high overhung loads. Consult your SEW assembly facility if oil bath lubricated bearings are required. 37 AD input shaft assembly

2 Constant Speed Gear Reducers R/F/K/S Selection of the gear unit Define the gear unit type Determine gear unit size based on Maximum output torque (T a max ) Gear unit reduction ratio (i) in the selection tables with AD input shaft assembly Check the maximum permitted overhung load value on the output (F Ra ) Check the maximum permitted input torque at the gear unit (P e ) with regard to the thermal limit power (see page 41) Check the overhung load at the input (F Re ) Please contact SEW if the requirements are more demanding (e.g. higher overhung load on the input end). Gear Unit Information Available AD Input Assemblies and Ratings Ratio i Output Speed n a R27 AD3 AD4 Input Output Input Input OHL Output Output Input Input OHL Output Power Torque Stages Power F Torque OHL Power P emax T amax P Re F Torque e T a F Ra P Re e T a rpm HP lb-in Pri. Sec. HP lb lb-in lb HP lb lb-in lb Output OHL F Ra Selection Table Example AD input shaft assembly 38

3 Centering shoulder AD../ZR The input shaft housing can be configured with a centering shoulder as an option for use when mounting a motor scoop. Contact your SEW-Eurodrive facility for additional information. AD../RS backstop The input shaft assembly can be configured with a backstop if the application only requires one direction of rotation. Backstops with centrifugally disengaging wedge elements are used. This design offers the advantage that, above a certain speed (lift-off speed), the wedge elements lift off the contacting surface and rotate with the shaft. As a result, the backstops operate with no wear or power loss. They are maintenance-free and can be used at high speeds. Dimensions: The backstop is completely integrated within the input cover. There is no difference in dimensions between an input shaft assembly with or without a backstop. Locking torques: Type Maximum locking torque of backstop Lift-off speed lb-in Nm rpm AD2/RS AD3/RS AD4/RS AD5/RS AD6/RS AD7/RS AD8/RS Specify output direction of rotation when ordering When you order a gear unit with an input shaft assembly and backstop, the required direction of rotation of the output shaft must be specified. The direction of rotation is specified as viewed from the output shaft of the gear unit. For drives with shaft extensions at ends A and B, the direction of rotation must be specified as viewed from end A. Caution: To avoid damage, the direction of rotation of the drive must be checked before starting up the machine. B CCW CW CCW Specify output direction of rotation when ordering CCW - Counterclockwise CW - Clockwise A CW 39 AD input shaft assembly

4 Constant Speed Gear Reducers R/F/K/S AD.. /P motor mounting platform Belt drives can be set up in a compact configuration using an adjustable motor mounting platform. The motor mounting platform is arranged in parallel to the input shaft. The distance from the input shaft can be adjusted using threaded columns. Helical gear unit with input shaft assembly and AD../P motor mounting platform The available gear unit / motor combinations for input shaft assemblies with motor mounting platforms can be found in the corresponding dimension sheets. R gear unit page 287 F gear unit page 451 K gear unit page 627 S gear unit page 726 Additional weights for AD../P Motor type Additional weight in lb IEC NEMA AD2/P AD3/P AD4/P AD5/P AD6/P AD7/P DT71 56C DT80 143T DT90 145T DT T/184T DV DV T/215T DV T/256T DV T/286T DV T DV T/364T DV T DV T AD input shaft assembly 40

5 Thermal limit power for gear units with input shaft assembly The power values given in the selection tables for gear units with input shaft assemblies are mechanical limit powers. However, gear units may become thermally overloaded before they reach the mechanical power limit. This depends on the mounting position. For mineral oils, corresponding cases are indicated in the selection tables by having the mounting position specified. Please contact SEW if the mounting position you require is the same as one of those indicated. By considering the actual operating conditions, it will then be possible to recalculate the thermal limit power based on the specific application. Alternatively, suitable measures can be taken (e.g. using a synthetic lubricant with higher thermal stability) to increase the thermal limit power of the gear unit. The following data is required for the evaluation: Gear unit type Output speed (n a ) rpm Ambient temperature C Gear ratio i *Cyclic duration factor cdf % Power drawn (P) kw Installation location:...in small, enclosed rooms...in large rooms, halls...in the open Installation situation: e.g. steel foundation, concrete foundation * Cyclic duration factor run time under load min / hr. = AD input shaft assembly