CN212115012U

CN212115012U - Optimized structure of automobile power assembly

Info

Publication number: CN212115012U
Application number: CN202021078880.1U
Authority: CN
Inventors: 潘宁静; 陈兴; 刘平; 肖志高
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 an automobile power assembly's optimization structure, the both ends cover respectively of motor shaft has first bearing and second bearing, and first bearing is cylindrical roller bearing, and the second bearing is deep groove ball bearing, and the inboard of first bearing and second bearing all pushes up with the motor shaft, and the outside of first bearing and second bearing is equipped with the mounting, the mounting carries out axial spacingly to first bearing and second 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

Optimized 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 the spline), the bearing room of four bearings is other in reduction gear rear housing, 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, the requirement has just been proposed to the axiality of four bearing rooms, and four bearing rooms are respectively on the casing 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 an optimized structure of automobile power assembly, the both ends of motor shaft overlap respectively has first bearing and second bearing, and first bearing is the cylindrical roller bearing, and the second bearing is deep groove ball bearing, and the inboard of first bearing and second bearing all pushes up with the motor shaft, still overlaps on the motor shaft to have reduction gear one-level driving gear, and reduction gear one-level driving gear sets up the outside at first bearing.

Preferably, the cylindrical roller bearing is sleeved on the motor shaft and is positioned at one end, close to the speed reducer, of the motor shaft; the deep groove ball bearing is sleeved on the motor shaft and is positioned at one end, far away from the speed reducer, of the motor shaft.

Preferably, the fixing parts are arranged on the outer sides of the first bearing and the second bearing and used for axially limiting the first bearing and the second bearing.

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 motor shaft is further provided with two second fixing pieces, one of the second fixing pieces is abutted against the outer side of the inner ring of the second bearing, and the other second fixing piece is abutted against the inner side of the outer ring 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 under clearance fit becomes strong is solved, be favorable to improving the NVH performance of whole car, make 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. And the radial bearing capacity of the cylindrical roller bearing is stronger than that of the deep groove ball bearing, so that under the same working condition, the size of the cylindrical roller bearing is smaller, and correspondingly, the size of an oil seal under the condition of needing the oil seal can be reduced, so that the linear speed of an oil seal lip under the same working condition is reduced, the restriction of the oil seal on the improvement of the rotating speed of a motor is improved, positive significance is brought to the improvement of the efficiency of a power assembly, and the cost is reduced well due to the reduction of the bearing.

Drawings

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

FIG. 2 is an enlarged view of a portion of area A of FIG. 1;

FIG. 3 is an enlarged view of a portion of the area B in FIG. 1;

FIG. 4 is a schematic cross-sectional view of the 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, 2, 3 and 4, in this embodiment, the first bearing 3 is preferably a cylindrical roller bearing, the second bearing 5 is preferably a deep groove ball bearing, 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 that the motor shaft is axially limited, and the motor shaft 1 can be prevented 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. The second fixing parts 9 are arranged on the outer side and the inner side of the second bearing 5, the two second fixing parts 9 are respectively propped against the inner ring and the outer ring of the second bearing 5, the second bearing 5 can be axially limited through the shaft shoulder 12 of the motor shaft 1 and the second fixing parts 9, the whole bearing and the motor shaft system can be axially limited, and the stability of the whole bearing and the motor shaft system is improved. Wherein the first fixing member 2 and the two second fixing members 9 are preferably snap rings.

The reducer primary driving gear 7 is sleeved on the motor shaft 1, and the reducer primary driving gear 7 is arranged on the outer side of the first bearing 3. 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 first bearing 3 together axially limit the primary driving gear 7 of the speed reducer.

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, as shown in fig. 1, the lubricating oil is located on the left side of the oil seal 4.

In this embodiment, the first bearing 3 is a cylindrical roller bearing, and the radial bearing capacity of the motor shaft 1 at the speed reducer 6 can be improved due to the large radial bearing capacity of the cylindrical roller bearing. And because the radial bearing capacity of the cylindrical roller bearing is stronger than that of the deep groove ball bearing, under the same working condition, the size of the cylindrical roller bearing is smaller, and correspondingly, the size of the oil seal 4 under the condition of needing the oil seal 4 can be reduced, so that the linear speed of the lip of the oil seal 4 under the same working condition is reduced, the restriction of the oil seal 4 on the improvement of the rotating speed of the motor is improved, the abrasion of the oil seal 4 can be reduced, and the service life of the oil seal is prolonged.

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

Claims

1. The utility model provides an automobile power assembly's optimization structure, its characterized in that, the both ends of motor shaft overlap respectively has first bearing and second bearing, and first bearing is the cylindrical roller bearing, and the second bearing is deep groove ball bearing, still overlaps on the motor shaft to have the one-level driving gear of reduction gear, and the one-level driving gear of reduction gear sets up the outside at first bearing.

2. The optimized structure of an automobile power assembly according to claim 1, wherein the cylindrical roller bearing is sleeved on the motor shaft and is positioned at one end of the motor shaft close to the speed reducer; the deep groove ball bearing is sleeved on the motor shaft and is positioned at one end of the motor shaft, which is far away from the speed reducer; the inner sides of the first bearing and the second bearing are abutted against the motor shaft.

3. The optimized structure of an automobile power assembly according to claim 2, wherein fixing members are arranged on the outer sides of the first bearing and the second bearing, and the fixing members axially limit the first bearing and the second bearing.

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

5. The preferable structure of the automobile power assembly according to claim 3, wherein the motor shaft further includes two second fixing members, one of the two second fixing members abuts against an outer side of the inner race of the second bearing, and the other second fixing member abuts against an inner side of the outer race of the second bearing.

6. The optimized structure of an automobile power assembly according to claim 3, 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 optimized structure of an automobile power assembly according to claim 1, wherein the motor shaft is a stepped rotating shaft, the two ends of the motor shaft are provided with annular clamping grooves to form steps, and the first bearing and the second bearing are arranged at the annular clamping grooves in an interference fit manner.