Slide Bearings Type E For Shaft Diameter Range mm Main Application Field Electric Machines

Transcription

1 Slide Bearings Type E For Shaft Diameter Range mm Main Application Field Electric Machines End flange mounted slide bearing type EFWF with water-cooling and lubrication by a fixed oil ring RENK series EFWF has been developed as a variation of the E-type bearing, based on the modular component principle. The EFWF bearings are a flange-mounted watercooled design with fixed oil ring lubrication. The mounting flange is located laterally at the end of the housing. The main application field for this type of bearings is electric machines in particular for marine application. This leaflet contains the data required for incorporating EFWF type bearings into machine designs.

2 Technical Information This brochure gives details of a range of fixed oil ring lubricated EF-bearings, shaft diameters 160 to 315 mm, suitable for use on electrical machines, fans, water turbines and pumps. For information on E-bearings with smaller shaft diameters refer to the corresponding RENK brochures. Bearing Housing The finned EF housings size 22 to 35 are made of high quality cast iron (EN-GJL-300) and are designed for heavy duty performance. Other materials, such as EN-GJS LT or GS 45 can be supplied in special cases. Bearing Shells The shells are manufactured from steel (C 10) and have a spherical seating. They are lined with RENKmetal therm 89 and the working surfaces and the oilways are configurated to give long life under severe operating conditions. Being fully interchangeable ensures trouble free assembly at all times. The bearing shells for the E type bearings with lubrication by fixed oil ring have always a plain cylindrical bore. Apart from bearings without thrust parts (type...q) there are shells with plain white-metal lined shoulders (type...b) to absorb non-continuous axial loads of limited magnitude, as well as shells with bi-directional taper land faces (type...k) which can absorb axial loads of medium magnitude. Alternatively the taper land faces can be supplied suitable for only one sense of rotation (type...e) to absorb high axial loads. Seals Particularly for marine application the EFWF-type bearings sizes 22 to 35 are equipped with rigid seals (type 20). These seals are made of corrosion resistant aluminium alloys and correspond to protection grade IP 44. Higher protection grade (up to IP 56) upon request. For stationary applications the bearings can be also fitted with floating labyrinth seals (type 10). These seals are made of fibre reinforced, high temperature resistant RENK plastic therm P50 and are resistant to wear. The floating labyrinth seals correspond to protection grade IP 44. Higher protection grades (up to IP 56) are also available. Special types of seals such as air seals or special machine seals are also available on request. Oil Supply Self lubrication by fixed oil ring in closed ring channel, up to approx. 18 m/s speed at the outer diameter of the ring. The non-locating bearings are fitted with fixed oil rings which move in axial direction on the shaft. The oil ring follows the movement of the shaft due to the friction produced by spring-mounted pressure plates. For use with locating bearing, the fixed oil ring is designed as collar, which can be either shrunk onto the shaft or machined out of the shaft forging. An oil scraper takes up the lubricant carried to the highest point by the fixed oil ring and delivers it to the oil pockets. The fixed oil ring has an excellent performance, ensuring enough lubricant amount even in the case of combined journal and thrust bearings. Electrical Insulation To prevent problems from electrical eddy currents, the EFWF bearings can be electrically insulated, internally. In such cases the spherical seating of the shell is coated with a layer of insulating plastic material. Also there is an insulating layer between rigid labyrinth seal and housing. Heat Dissipation Frictional heat generated is usually dissipated by radiation and natural convection. Water cooling can also be used, through seawater resistant cooling tubes submerged in the oil sump. Dimensions for connection upon request. Temperature Control Two independent commercially available thermosensors can be used for monitoring the temperature of the bearing. We recommend the use of RENK resistance thermometers; alternatively RENK angle thermometers for direct visual reading. Oil Selection Generally, any branded oil of low foaming tendency can be used as a lubricant. The correct viscosity for each operating condition will be determined by EDP calculation. Such calculations are always carried out at the design stage. A print-out of the results can be provided on request. Hydrostatic Jacking In the case of high surface pressures, provision can be made for high pressure jacking oil. The bottom half shell is provided with two hydrostatic pockets (one either side of the vertical centre line) with connections to a high pressure jacking system via flexible pipes. Further Options For applications where the start-up takes place at low ambient temperatures, the bearings can be fitted with a heater located in the oil sump.

3 Dimensions of Bearings 1) Seal diameters (d 9 ) are possible with every shaft diameter of one size. 2) This dimension is about 3 mm larger in case of insulated bearings. 3) Bore available on both sides. All weight values indicated in this catalogue are average, non-binding values. The drawings shown are not strictly binding. Note Any additional machine seal on the machine side will be of special design.

4 Locating bearing Non-locating bearing Oil level gauge Dimensions in mm Size D B 1 B 2 B 3 B 4 b 1 b 2 b 3 b 4 b 5 b 6 2) b 7 2) d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 1) d x 26 f M , h and x M x 33 f M ,3 18, h and x M x 40 f M , h and x M

5 Type E Housing F finned end flange mounted Heat dissipation W water cooling (finned tubes in oil sump) Shape of bore and type of F plain cylindrical bore, fixed oil ring lubrication lubrication Q without thrust parts (non-locating bearing) B plain sliding surfaces (guide bearing) Thrust parts K taper land faces for both senses of rotation (locating bearing) E taper land faces for one sense of rotation (locating bearing) Example for quoting a slide bearing type EF, water cooling with finned tubes in oil sump, plain cylindrical bore with fixed oil ring, thrust part with taper land faces for both senses of rotation as locating bearing, size 28, shaft diameter 280 mm: Slide bearing E F W F K The connection bores are fully interchangeable only as shown (modification or substitution of singular bores is not possible). Connection for Connection for Connection for Suction pipe Connection Connection Connection Oil Weight Oil thermosensor 3) cooler hydrostatik for hydrostatic for return pipe for for oil sump inlet outlet content jacking jacking hydrostatic heater thermometer bore bore d 11 d 12 t e 1 e 2 f 1 d 13 e 3 f 2 d 14 d 15 jacking d 16 d 17 d 18 d 19 d 20 h 1 h 2 L 1 [kg] [L] 2 x 2 x approx. approx. G 1/ G 3/ G 1/4 G 1/2 G 1/4 G 1 1/2 G 1/2 G 3/4 G 3/ ±5 front 2 x 1 x approx. approx. G 1/ G 3/8A G 1/4 G 1/2 G 1/4 G 1 1/2 G 1/2 G 3/4 G 3/ , ±5 side 2 x 1 x approx. approx. G 1/ G G 1/4 G 1/2 G 1/4 G 2 G 1/2 G 1 G ±8 side

6 Load Table Size Shaft-Ø F R (1) F R (2) Thrust part B (3) Thrust part K (4) Thrust part E (4) D F A F A F A [mm] [kn] [kn] [kn] [kn] [kn] The table serves only to select the size of E-Type bearing. Before booking an order, however, it will be necessary to carry out an EDP calculation, taking into account the reciprocal influence of operating parameters. 1. Radial loads F R in [kn] as permanent load without hydrostatic jacking (maximum value) for plain cylindrical bores. 2. Radial loads F R in [kn] as permanent load with hydrostatic jacking (maximum value) for plain cylindrical bores. 3. Axial load F A in [kn] which can be taken only for a short time (maximum value). 4. Axial load F A in [kn] as permanent load (maximum value).

7 Shaft Dimensions Locating bearing (axial clearance ± 0,25) Non-locating bearing (axial clearance ± 5) Chamfered edges 0,5 x 45 Surface condition DIN ISO 1302 Dimensions in mm Size D 1) b 1 b 2 b 3 b 4 b 5 b 6 d 1 d 2 d 3 r 1 r , ) For shaft dimensions see also our Manual for the application of RENK slide bearings or the computed calculation. Note: the listed shaft dimensions do not take into consideration the fitting of an additional machine seal (special design). Tolerances of form and position follow DIN Degree of accuracy B 10; others upon request.

8 Hydrostatic Jacking Unit for Bearings with Fixed Oil Ring This plan refers to a hydrostatic jacking unit mounted to a console, with two pump-motor unit with four pressure switches. 1.0 pump-motor unit 2.0 redundant pump-motor unit 3.0 shuttle valve 4.0 terminal box 5.0 filter 6.0 volume governor 7.0 terminal box 7.1 pressure switch 7.2 pressure switch 7.3 pressure switch 7.4 pressure switch 7.5 manometer 8.0 flow governor 9.0 terminal box with flange

9 Connecting Plan for Hydrostatic Jacking

10 Sales Organisation Headquarters and Manufacturing Plant RENK AKTIENGESELLSCHAFT Werk Hannover Weltausstellungsallee 21 D Hannover Phone: +49 (5 11) Fax: +49 (5 11) Internet: Manufacturing Plant Assembly and Distribution Centers with Sales and Engineering Support OMEGA RENK BEARINGS PVT. LTD. Anand Nagar, Raisen Road Bhopal India Phone: ( ) Fax: ( ) omtec@sancharnet.in Internet: Sales Agencies Australia Austria Belgium Brazil Canada Czech Republic Croatia Finland France G.B. and Ireland Hungary India Italy Japan Liechtenstein Luxembourg Mexico Netherlands Norway PR China Slovak Republic Slovenia Republic South Africa South Korea Spain Switzerland USA RENK Corporation 304, Tucapau Road Duncan S.C. USA Phone: (1-8 64) Fax: (1-8 64) COFICAL RENK MANCAIS DO BRASIL LTDA. Rodovia BR-280, km 54 - Em frente ao Parque Municipal de Exposições CEP Guaramirim - SC - Brasil Phone: (55-4) Fax: (55-4) MAN B&W (Japan) Ltd. RH Division; Fuji Building (Room 121) Marunouchi Chiyoda-ku, Tokyo Japan Phone: (81-3) Fax: (81-3) We reserve the right to changes made in the interests of technical improvement. RH-1222 (08.05) Printed in Germany