CN212115046U

CN212115046U - Two bearing structure of automobile power assembly

Info

Publication number: CN212115046U
Application number: CN202021078885.4U
Authority: CN
Inventors: 潘晓东; 陈兴; 潘宁静; 曹保平; 郭雪成
Original assignee: Zhuzhou Gear Co Ltd
Current assignee: Zhuzhou Gear Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-12-08
Anticipated expiration: 2030-06-12

Abstract

The utility model provides a two bearing arrangement of automobile power assembly, the both ends of motor shaft overlap respectively has first bearing and second bearing, and the inboard of first bearing and second bearing all pushes up with the motor shaft to it is spacing to carry out the axial to the motor shaft. The first bearing of cover on the motor shaft is located the one end that is close to the reduction gear, and the second bearing of cover on the motor shaft is located the one end of keeping away from the reduction gear, and first bearing and second bearing are ball bearing. The problem that under the four bearing structures, four bearing room axiality on the different casings require highly and noise becomes strong under clearance fit is solved to this embodiment, is favorable to improving the NVH performance of whole car, makes the power assembly structure compacter, has saved power assembly's arrangement space, effectual the cost is reduced.

Description

Two bearing structure of automobile power assembly

Technical Field

The utility model relates to a new energy automobile field, concretely relates to power assembly of car.

Background

The reduction gear axle and the motor shaft arrangement structure of traditional new energy automobile power assembly adopt four bearings to arrange usually, motor shaft and reduction gear axle respectively have two bearings to be as supporting promptly, then the diaxon realizes the transmission of moment through certain clearance fit (for example spline), the bearing room of four bearings is in reduction gear rear shell respectively, the reduction gear procapsid, motor casing, on the motor rear end cover, in order to guarantee that reduction gear axle and motor shaft can realize correct cooperation, just the requirement has been proposed to the axiality of four bearing rooms, and four bearing rooms are respectively on the shell of difference, the degree of difficulty of processing has been increased, the clearance fit of diaxon has certain alleviating to this kind of condition, but clearance fit can lead to the power assembly to produce the noise at the in-process of operation. In addition, as new energy industry competition becomes more intense, the host factory has a greater and greater call for cost reduction.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: how to improve the NVH performance of whole car, make power assembly structure compacter, save the arrangement space of power assembly, reduce cost.

The needle is with above-mentioned problem, the utility model provides a technical scheme is: the utility model provides a two bearing arrangement of automobile power assembly which characterized in that, the both ends of motor shaft overlap respectively has first bearing and second bearing, still overlaps on the motor shaft to have the first-order driving gear of reduction gear, and the first-order driving gear of reduction gear sets up the outside at first bearing.

Preferably, the inner sides of the first bearing and the second bearing are propped against the motor shaft, fixing pieces are arranged on the outer sides of the first bearing and the second bearing, and the fixing pieces are used for axially limiting the first bearing and the second bearing.

Preferably, the first bearing sleeved on the motor shaft is positioned at one end close to the speed reducer, and the second bearing sleeved on the motor shaft is positioned at one end far away from the speed reducer.

Preferably, the fixing piece arranged on the outer side of the first bearing is a first fixing piece, the first fixing piece is abutted against the outer side of the outer ring of the first bearing, and the inner side of the primary driving gear of the speed reducer is abutted against the outer side of the inner ring of the first bearing.

Preferably, the fixing member disposed outside the second bearing is a second fixing member, and the second fixing member abuts against an outer side of the inner race of the second bearing.

Preferably, the outer side of the first-level driving gear of the speed reducer is provided with a third fixing piece, and the third fixing piece is propped against the outer side of the first-level driving gear of the speed reducer.

Preferably, the motor shaft is the step pivot, and the both ends of motor shaft all are provided with ring groove and form the step, and first bearing and second bearing all install ring groove department with interference fit's mode.

The utility model has the beneficial technical effects that: the original speed reducer shaft is eliminated, only the motor shaft is reserved, and the primary driving gear on the original speed reducer shaft is fixed on the motor shaft instead. The problem of under the four bearing structures, four bearing room axiality on the different casings require highly and noise becomes strong under clearance fit is solved, be favorable to improving the NVH performance of whole car, let the power assembly structure compacter, saved the arrangement space of power assembly, reduced the quantity of driving medium and cancelled the cooperation of reduction gear axle and motor shaft, it has positive meaning to the efficiency promotion of power assembly, the reduction of bearing also can be fine reduce cost moreover.

Drawings

FIG. 1 is a schematic overall structure diagram according to a first embodiment;

FIG. 2 is a schematic cross-sectional view of a motor shaft according to the first embodiment;

in the figure: the motor comprises a motor shaft 1, a first fixing piece 2, a first bearing 3, an oil seal 4, a second bearing 5, a speed reducer 6, a speed reducer primary driving gear 7, a speed reducer front shell 8, a second fixing piece 9, a third fixing piece 10, an annular clamping groove 11, a shaft shoulder 12 and an annular groove 13.

Detailed Description

The invention is further described below with reference to the following examples and figures:

example one

As shown in fig. 1, the reducer 6 includes a reducer front housing 8, in this embodiment, a reducer primary driving gear 7 is sleeved at one end of the motor shaft 1, bearings are sleeved at both ends of the motor shaft 1, and two bearings are used as supports of the motor shaft 1 to form a highly integrated two-bearing cantilever beam structure.

As shown in fig. 1 and fig. 2, in the present embodiment, the first bearing 3 and the second bearing 5 are preferably deep groove ball bearings, the motor shaft 1 is a stepped rotating shaft, the two ends of the motor shaft 1 are both provided with an annular clamping groove 11 to form a step, the first bearing 3 is sleeved on the annular clamping groove 11 at one end of the motor shaft 1 close to the speed reducer 6 in an interference fit manner, and the inner sides of the first bearing 3 and the second bearing 5 are both abutted against a shaft shoulder 12 of the motor shaft 1, so as to axially limit the motor shaft and prevent the motor shaft 1 from moving in the axial direction. The first fixing piece 2 is arranged on the outer side of the first bearing 3, and the first fixing piece 2 is abutted against the outer side of the outer ring of the first bearing 3, so that the first bearing 3 is axially limited through the shaft shoulder 12 of the motor shaft 1 and the first fixing piece 2. The second bearing 5 is sleeved on the annular clamping groove 11 at one end of the motor shaft 1 far away from the speed reducer 6 in an interference fit mode. And a second fixing piece 9 is arranged on the outer side of the second bearing 5, and the second fixing piece 9 is abutted against the outer side of the inner ring of the second bearing 5, so that the second bearing 5 is axially limited through a shaft shoulder 12 of the motor shaft 1 and the second fixing piece 9. Both the first attachment 2 and the second attachment 9 are preferably snap rings.

The reducer first-level driving gear 7 is sleeved on the motor shaft 1, the reducer first-level driving gear 7 is arranged on the outer side of the first bearing 3, and the outer side of the first bearing 3 is propped against the reducer first-level driving gear 7. The connection between the first-level driving gear 7 of the speed reducer and the motor shaft 1 can be any one of interference connection, spline connection, flat key connection and inclined key connection, the connection modes can both realize that the motor shaft 1 drives the first-level driving gear 7 of the speed reducer to rotate, and the interference connection is preferred in the embodiment. The motor shaft 1 is further provided with a third fixing piece 10, the third fixing piece 10 is arranged on the outer side of the first-stage driving gear 7 of the speed reducer, and the third fixing piece 10 is abutted to the outer side of the first-stage driving gear 7 of the speed reducer. The third fixing member 10 may be a snap ring, a rivet, or a round nut, and the third fixing member 10 and the inner ring of the first bearing 3 axially limit the first-stage driving gear 7 of the speed reducer together, so that the connection structure of the first-stage driving gear 7 of the speed reducer, the snap ring 9, and the first bearing 3 is compact.

In this embodiment, the transmission gear and the bearing of the speed reducer are lubricated by oil lubrication, and in order to prevent oil leakage, an oil seal 4 is further sleeved on the motor shaft 1, and as shown in fig. 1, the lubricating oil is located on the left side of the oil seal 4.

It will be apparent that modifications and variations are possible without departing from the principles of the invention.

Claims

1. The utility model provides a two bearing arrangement of automobile power assembly which characterized in that, the both ends of motor shaft overlap respectively has first bearing and second bearing, still overlaps on the motor shaft to have the first-order driving gear of reduction gear, and the first-order driving gear of reduction gear sets up the outside at first bearing.

2. The two-bearing structure of the automobile power assembly according to claim 1, wherein the inner sides of the first bearing and the second bearing are abutted against the motor shaft, and the outer sides of the first bearing and the second bearing are provided with fixing members which axially limit the first bearing and the second bearing.

3. The dual bearing arrangement of claim 1, wherein the first bearing on the motor shaft is located near the reducer and the second bearing on the motor shaft is located far from the reducer.

4. The two-bearing structure of the automobile power assembly according to claim 3, wherein the fixing member provided on the outer side of the first bearing is a first fixing member which abuts against the outer side of the outer ring of the first bearing, and the inner side of the primary driving gear of the speed reducer abuts against the outer side of the inner ring of the first bearing.

5. The two-bearing structure of an automobile power assembly according to claim 3, wherein the fixing member provided outside the second bearing is a second fixing member that abuts against an outside of the inner race of the second bearing.

6. The two-bearing structure of the automobile power assembly as claimed in claim 4, wherein a third fixing member is disposed outside the primary driving gear of the speed reducer, and the third fixing member abuts against the outside of the primary driving gear of the speed reducer.

7. The two-bearing structure of the automobile power assembly as claimed in claim 1, wherein the motor shaft is a stepped shaft, the two ends of the motor shaft are provided with annular locking grooves to form steps, and the first bearing and the second bearing are mounted at the annular locking grooves in an interference fit manner.