CN202032267U

CN202032267U - Lubrication structure of bearing of traction motor

Info

Publication number: CN202032267U
Application number: CN2011201140862U
Authority: CN
Inventors: 谭磊
Original assignee: XIANGTAN TRACTION MOTOR FACTORY
Current assignee: XIANGTAN TRACTION MOTOR FACTORY
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-11-09
Anticipated expiration: 2021-04-19

Abstract

The utility model relates to a motor, in particular to a lubrication structure of a bearing at a driving end of the motor, and specifically discloses a lubrication structure of a bearing of a traction motor. The lubrication structure comprises a rotor and an end cover, wherein a shaft end of the rotor is supported on the end cover through the bearing, an outer bearing cover fixed with the end cover is arranged at the outer side of the bearing, an inner bearing cover fixed with the end cover is arranged at the inner side of the bearing, and an inner seal ring matched with the inner bearing cover is also fixed on the rotor. According to the lubrication structure of the bearing of the motor, provided by the utility model, a motor bearing chamber can be communicated with a gear box, so that oil of the same brand can be adopted for the bearing and the gear of the motor for lubrication, and thus, oil lubrication of the bearing is realized, and the problem of grease lubrication is solved.

Description

The traction electric machine bearing lubrication structure

Technical field

The utility model relates to motor, and particularly the lubricating structure of electric-motor-driving step bearing is specially a kind of pulling motor for locomotive.

Background technique

The traditional lubrication system of pulling motor for locomotive is that bearing adopts grease lubrication.The electric-motor-driving end is provided with gear-box 21, and the small gear 22 and the locomotive gearwheel 23 of electric-motor-driving end mesh and adopt oil lubrication in gear-box 21, as shown in Figure 1.This structure is in operation and has certain defective: 1, structural limitations, may cause " scurrying oil " phenomenon to take place, cause electrical fault: limited by electric machine structure, outer bearing cover 4 (not revolving part) and and the fixing outer seal ring 24 (revolving part) of axle between must have certain clearance, motor can not seal fully with gear-box.During the rotor rotation, can form negative pressure between rotor end and the bearing chamber 7, when the free vent on the end cap 2 during obstructed or off-capacity, will with the oil in the gear-box along outer bearing cover and outside gap between the seal ring suck in the motor bearings chamber 7, in the locomotive operation process, two kinds of oiling agents of different nature can not be gone here and there mutually, otherwise greasy property descends.The oil that major part is inhaled into can drain to outside the motor by the oil leaking hole on the outer bearing cover.Because the stickiness of fat compares innage, prior motor inside cap 5 is relative simple with labyrinth seal structure between the axle sleeve 25, the inner ring that is inside cap 5 only has single radial seal groove, so, entering gear oil in the bearing chamber has and a spot ofly is inhaled into motor internal by labyrinth seal structure, destroy the electrical machine insulation system, cause faults such as motor ground connection or turn-to-turn short circuit.Phenomenon that Here it is so-called " scurrying oil ".2, bearing needs the periodic maintenance maintenance, otherwise can cause damage of bearings: in motor operation course, bearing grease can constantly consume, and this just needs regularly to add lubricating grease for bearing.The lubricating grease addition is too much or very few, oil is impure, rotten etc. all can cause phenomenons such as the bearing operation is bad, overheated, causes bearing fault, the motor damage.3, the composition of lubricating grease mainly is the oils of lubricate and the soap class of assist formation.Lubricate mainly be oils, therefore, the greasy property of lubricating grease is more much lower than oil lubrication.Locomotive running speed is more and more higher, and the traction electric machine rotating speed also improves thereupon, and the advantage that the lubricated greasy property of bearing oil is good, be fit to high rotating speed, can reduce bear vibration and noise more and more embodies.4, do not have circulation because of lubricating grease, because of stirring heating in the bearing rotation process, can go bad, wear out and soften, working life is shorter.And when changing lubricating grease, need series of steps such as bearing disintegration, cleaning, change trouble.Oil lubrication long service life, replacing simply are convenient to use.

Along with locomotive develops towards the high speed direction, the application of asynchronous traction motor more and more widely.There are above many restrictions in traditional bearing grease lubricating structure, is difficult to satisfy the requirement that motor bearings runs up.

Summary of the invention

" scurrying oil " phenomenon easily takes place and influences lubrication effect and driving end bearing employing existing defective of grease lubrication and problem in order to solve existing pulling motor for locomotive driving end in the utility model, a kind of traction electric machine bearing lubrication structure is provided, this design makes motor bearings and gear lubrication adopt the oil lubrication of the identical trade mark, and has effectively avoided " scurrying oil " phenomenon.

The utility model is to adopt following technological scheme to realize: the traction electric machine bearing lubrication structure, outer bearing cover is provided with the oiling box, outer bearing cover is positioned to have on the position in oiling box chamber with bearing chamber (all has bearing chamber on the existing conventional motor, bearing chamber is respectively by the cavity that forms between outer bearing cover, outer seal ring and inside cap, axle sleeve or internal sealed ring and the bearing) through hole that communicates, sealing is provided with stopper in the through hole, is installed with lace cord on the stopper; The inside cap inner ring has at least two (ring-type) radial seal groove, the bottom of each radial seal groove (being as the criterion with the inside cap position that assembles) has oil leaking hole, the bottom of inside cap has spill port, the oil leaking hole of each radial seal groove bottom communicates with spill port, also have the spill port that communicates with each other on end cap and outer bearing cover, the spill port on the inside cap communicates with spill port on the end cap.During use, gear-box is fastened on electric motor end cap or the outer bearing cover as prior art, make the oiling box be positioned at gear-box, lubricant oil is after the gear rotation takes up in the gear-box, enter the oiling box, be connected, promptly lubricant oil is sucked in the motor bearings chamber by lace cord by lace cord and bearing chamber, guarantee lubricant oil cleaning, no-sundries, give the bearing sufficient lubrication.Spill port on oil leaking hole in the radial seal groove of lubricant oil on the inside cap inner ring in the bearing chamber, spill port, end cap and the outer bearing cover of inside cap bottom is back to gear-box, thereby realizes the circulation of lubricant oil.

The motor bearings chamber of traction electric machine bearing lubrication structure described in the utility model can communicate with gear-box, makes motor bearings and gear lubrication adopt the oil lubrication of the identical trade mark (promptly realized the oil lubrication of bearing, overcome the problem that grease lubrication exists).And the labyrinth structure of inside cap and internal axle sleeve formation is more complicated, reliable, and lubricant oil can not be inhaled into the rotor end, also just no longer has " scurrying oil " problem.Can form good oil circulation between bearing chamber and the gear-box, lubricating bearings well is more conducive to take away the heat of bearing, effectively brings into play the characteristic that bearing runs up.The utility model is rational in infrastructure, and the bearing oil oil circuit is simply clear, and it is smooth and easy to circulate, and can be used for all locomotives oil-lubricated bearing traction electric machine, also can be used for the motor of other oil lubrication.

Description of drawings

Fig. 1 is existing traction electric machine bearing lubrication structure schematic representation;

Fig. 2 is the structural representation of traction electric machine bearing lubrication structure described in the utility model;

Fig. 3 is the A-A sectional drawing of Fig. 2;

Fig. 4 is the partial structurtes schematic representation of inside cap;

Among the figure: 1-rotor, 2-end cap, 3-bearing, 4-outer bearing cover, the 5-inside cap, 6-internal sealed ring, 7-bearing chamber, 8-stopper, the 9-lace cord, 10-radial seal groove, 11-oil leaking hole, 12-spill port, 13,14-spill port, 15-accepts the chamber, 16-oil storage chamber, 17-filter screen, the 18-seal groove, 21-gear-box, 22-small gear, the 23-gearwheel, the outer seal ring of 24-, 25-axle sleeve.

Embodiment

Pulling motor for locomotive, comprise rotor 1, end cap 2, the rotor axle head is supported on the end cap 2 by bearing 3, and bearing 3 arranged outside have the outer bearing cover of fixing with end cap 24, bearing 3 inboards are provided with the inside cap of fixing with end cap 25, also are fixed with the internal sealed ring 6 that cooperates with inside cap 5 on the rotor; Outer bearing cover 4 is provided with the oiling box, and the outer bearing cover 4 of traction electric machine bearing lubrication structure is positioned on the position in oiling box chamber and has the through hole that communicates with bearing chamber 7, and sealing is provided with stopper 8 in the through hole, is installed with lace cord 9 on the stopper; Inside cap 5 inner rings have at least two (ring-type) radial seal groove 10, the bottom of each radial seal groove 10 has oil leaking hole 11, the bottom of inside cap 5 has spill port 12, the oil leaking hole 11 of each radial seal groove bottom communicates with the spill port 12 of inside cap 5 bottoms, also have the

spill port

13,14 that communicates with each other on end cap 2 and outer bearing cover 4, the spill port 12 on the inside cap 5 communicates with spill port 13 on the end cap 2.During concrete enforcement, the radial seal groove 10 on the inside cap inner ring is four.From the oil leaking hole diameter maximum of the nearest radial seal groove (first seal groove) of bearing 3, most lubricant oil can be flowed back to gear-box via first seal groove on inside cap 5 inner rings.The oil leaking hole of all the other seal grooves is less relatively, plays the effect of protection oil circulation.Be subjected to the restriction of outer bearing cover 4 surface sizes, the oiling box is as being conventional shape, and its volume can't be too big, and the store oil amount is limited, is unfavorable for the circulation of lubricant oil; For this reason, the oiling box is by accepting chamber 15 and constituting with the oil storage chamber 16 of accepting that the chamber communicates and extend along the outer bearing cover surface downwards; Stopper 8 is positioned at the oil storage chamber 16 of oiling box, can increase the store oil amount of oiling box like this, improves the circulation of lubricant oil.During concrete the manufacturing, can adopt multiple structure to realize on the outer bearing cover oiling box being set, as can be with the welding of oiling box, be bonded on the outer bearing cover, or adopt casting, casting etc. that oiling box and outer bearing cover is one-body molded.Filter screen 17 is set in the import of oiling box, enters the oiling box to avoid the impurity in the gear-box.The spill port 12 of inside cap 5 bottoms is made of transverse holes that communicates with each other and vertical hole.Transverse holes is used to link up each radial seal groove, and vertical hole communicates with spill port on the end cap.For further increasing the sealing between inside cap 5 and the end cap 2, on inside cap 5 and end cap opposing end faces, have seal groove 18, place rubber seal in the seal groove 18, further to prevent the leakage of oil between inside cap and the end cap.For further preventing " scurrying oil " phenomenon, on the surface of contact of internal sealed ring 6 and inside cap 5, be provided with labyrinth seal structure; Labyrinth seal structure is existing the application on existing like product.So-called labyrinth seal structure is exactly to have a plurality of axial seal grooves on the end face of inside cap, has the tooth that groove a plurality of and on the inside cap end face matches on the end face of internal sealed ring, and teeth groove cooperates to increase climbs oily distance, thereby plays the effect of sealing.

Claims

1. traction electric machine bearing lubrication structure, it is characterized in that: outer bearing cover (4) is provided with the oiling box, outer bearing cover (4) is positioned on the position in oiling box chamber and has the through hole that communicates with bearing chamber (7), and sealing is provided with stopper (8) in the through hole, is installed with lace cord (9) on the stopper; Inside cap (5) inner ring has at least two radial seal groove (10), the bottom of each radial seal groove (10) has oil leaking hole (11), the bottom of inside cap (5) has spill port (12), the oil leaking hole of each radial seal groove bottom (11) communicates with the spill port (12) of inside cap (5) bottom, also have the spill port (13,14) that communicates with each other on end cap (2) and outer bearing cover (4), the spill port (12) on the inside cap (5) communicates with spill port (13) on the end cap (2).

2. traction electric machine bearing lubrication structure as claimed in claim 1 is characterized by: the oiling box is by accepting chamber (15) and constituting with the oil storage chamber (16) of accepting that the chamber communicates and extend along the outer bearing cover surface downwards; Stopper (8) is positioned at the oil storage chamber (16) of oiling box.

3. traction electric machine bearing lubrication structure as claimed in claim 1 or 2 is characterized by: on inside cap (5) inner ring from the oil leaking hole diameter maximum of the nearest radial seal groove of bearing (3).

4. traction electric machine bearing lubrication structure as claimed in claim 1 or 2 is characterized by: filter screen (17) is set in the import of oiling box.

5. traction electric machine bearing lubrication structure as claimed in claim 1 or 2 is characterized by: have seal groove (18) on inside cap (5) and end cap opposing end faces, place rubber seal in the seal groove (18).