阅读说明：本技术 一种纯电动动力总成电机轴与减速器输入轴连接结构 (Connecting structure of motor shaft and input shaft of speed reducer of pure electric power assembly ) 是由 马安朋 包科杰 陈志华 于 2021-01-12 设计创作，主要内容包括：本发明公开了一种纯电动动力总成电机轴与减速器输入轴连接结构,包括电机轴总成,减速器轴总成,电机轴总成一端被电机右支撑轴承支撑限位,另一端靠近中部被电机轴左支撑轴承支撑限位,减速器一端被减速器支撑轴承支撑,另一端与电机轴相互连接,减速器轴总成与电机轴总成连接端的端部设置内止口支撑面,电机轴总成相对应部位设置外止口支撑面,电机轴总成外止口支撑面与减速器轴总成内置口支撑面接触配合,将减速器轴总成支撑,新的改进结构设计,相校于现有技术,一方面能保证传递动力的平稳性,另一方面能减少一个支撑轴承,有效降低动力总成连接结构的制造成本。(The invention discloses a structure for connecting a motor shaft of a pure electric power assembly and an input shaft of a speed reducer, which comprises a motor shaft assembly and the speed reducer shaft assembly, wherein one end of the motor shaft assembly is supported and limited by a right supporting bearing of the motor, the other end of the motor shaft assembly, which is close to the middle part, is supported and limited by a left supporting bearing of the motor shaft, one end of the speed reducer is supported by a supporting bearing of the speed reducer, the other end of the speed reducer is mutually connected with the motor shaft, an inner spigot supporting surface is arranged at the end part of the connecting end of the speed reducer shaft assembly and the motor shaft assembly, an outer spigot supporting surface is arranged at the corresponding part of the motor shaft assembly, and the outer spigot supporting surface of the motor shaft assembly is in contact fit with the inner spigot supporting surface of the speed reducer shaft assembly to support the speed reducer shaft assembly.)

1. The utility model provides a pure electric power assembly motor shaft and reduction gear input shaft connection structure, including the motor shaft assembly, reduction gear shaft assembly reduction gear support bearing, motor shaft assembly one end is supported spacingly by motor right side support bearing, the other end is close to the middle part and is supported spacingly by motor shaft left side support bearing, reduction gear one end is supported by reduction gear support bearing, the other end and motor shaft interconnect, the motor shaft assembly passes through the mutual joint of the internal spline on external splines and the reduction gear shaft assembly above that, realize the effective transmission of moment of torsion, its characterized in that: the end part of the connecting end of the reducer shaft assembly and the motor shaft assembly is provided with an inner spigot supporting surface, the corresponding part of the motor shaft assembly is provided with an outer spigot supporting surface, and the outer spigot supporting surface of the motor shaft assembly is in contact fit with the inner spigot supporting surface of the reducer shaft assembly to support the reducer shaft assembly.

2. The structure of claim 1, wherein the motor shaft of the pure electric power assembly is connected to the input shaft of the speed reducer, and the structure is characterized in that the outer seam allowance support surface of the motor shaft assembly is arranged at a solid part of the motor shaft, and the left support shaft of the motor shaft is preferably arranged close to the outer edge of the inner seam allowance support surface of the speed reducer assembly.

3. The structure for connecting the motor shaft of the pure electric power assembly and the input shaft of the speed reducer according to claim 2, wherein a preferred range of a distance G between a left support shaft of the motor shaft and a support surface of an inner spigot of the speed reducer assembly is 3.5-4.5 mm.

Technical Field

The invention relates to a new energy automobile power assembly, in particular to a structure for connecting a motor shaft and a reducer input shaft of a pure electric power assembly.

Background

With the gradual rise of pure electric new energy automobiles, various large automobile manufacturing companies strive to reduce the design cost of parts and improve the efficiency of a transmission system while improving the quality of key parts of the new energy automobiles, the improvement of the efficiency of the transmission system determines the cost to a certain extent, the contradiction between the product quality and the cost is solved, the contradiction is required to be verified in the product planning and defining stages, the product quality is ensured, the cost is considered comprehensively, the electric power assembly motor shaft and reducer input shaft connecting structure plays a more critical role in the automobile structural design, on one hand, the transmission efficiency of a motor is ensured, on the other hand, the transmission precision is also ensured, and the generation of overlarge noise is avoided.

The motor shaft and the reducer transmission system of the existing electric power assembly generally support the reducer and the motor shaft assembly through a plurality of supporting bearings, and the structural design needs more supporting bearings to ensure the stability of power transmission.

Disclosure of Invention

The invention aims to provide a structure for connecting a motor shaft of a pure electric power assembly and an input shaft of a speed reducer, which can ensure the stability of power transmission of a power motor and the speed reducer and effectively reduce the cost of the power assembly.

In order to achieve the purpose, the invention comprises a motor shaft assembly, a speed reducer shaft assembly and a speed reducer supporting bearing, wherein one end of the motor shaft assembly is supported and limited by a motor right supporting bearing, the other end of the motor shaft assembly, which is close to the middle part, is supported and limited by a motor shaft left supporting bearing, one end of the speed reducer is supported by the speed reducer supporting bearing, the other end of the speed reducer is mutually connected with a motor shaft, the motor shaft assembly is mutually clamped with an internal spline on the speed reducer shaft assembly through an external spline on the motor shaft assembly, and the effective transmission of torque is realized, and the invention is characterized in that: the end part of the connecting end of the reducer shaft assembly and the motor shaft assembly is provided with an inner spigot supporting surface, the corresponding part of the motor shaft assembly is provided with an outer spigot supporting surface, and the outer spigot supporting surface of the motor shaft assembly is in contact fit with the inner spigot supporting surface of the reducer shaft assembly to support the reducer shaft assembly.

Furthermore, according to the invention, the outer spigot supporting surface of the motor shaft assembly is arranged at the solid part of the motor shaft, and the preferred position of the left supporting shaft of the motor shaft is close to the outer edge of the inner spigot supporting surface on the reducer assembly.

Drawings

Fig. 1 is a schematic diagram of a prior art structure.

FIG. 2 is a schematic cross-sectional view of the structure of the present invention.

FIG. 3 is a schematic view of a motor shaft assembly according to the present invention.

FIG. 4 is a schematic view of the reducer shaft assembly according to the present invention.

Fig. 5 is a preferred embodiment of the structure of the present invention.

In the drawings

5-motor shaft assembly; 52-external spline; 6-reducer shaft assembly; 61-internal spline; 53-male end support surface; 62-inner spigot support surface; 50-motor shaft right support bearing; 51-motor shaft left support bearing; 60-reducer support bearing; 11-middle support bearing, 7-internal and external spline matching part; 63-outer edge surface 63 of the inner spigot supporting surface of the reducer assembly; g is the gap between the outer edge surface of the inner spigot support surface and the left support bearing of the motor shaft.

Detailed Description

If fig. 1 is the structural schematic diagram of the prior art, in the figure, motor shaft assembly 5, reduction gear shaft assembly 6, the reduction gear left end is supported by left support bearing 60, 5 right-hand members of motor shaft assembly are supported by motor shaft right support bearing 50, the left end is supported by motor left support bearing 51, there is middle support bearing 11 in motor shaft assembly 5 and reduction gear bearing 6 junction, current structure, if do not set up middle support bearing 11, cantilever connection appears in reduction gear shaft assembly and motor shaft, distortion appears easily in the operation process, lead to the power transmission stationarity variation, the noise problem appears.

Referring to fig. 2, which is a schematic sectional view of the structure of the present invention, compared with fig. 1 of the prior art, the present invention omits the middle support bearing 11 in fig. 1, and designs an inner spigot support surface 62 by lengthening the end of the reducer shaft assembly, during the assembly process, the inner spigot support surface 62 on the reducer shaft assembly contacts and matches with the outer spigot support surface 53 at the corresponding position of the motor shaft assembly, so as to support the reducer, and the outer spigot support surface 53 of the motor shaft assembly is arranged at the solid position of the motor shaft.

Referring to fig. 3, which is a schematic structural diagram of the motor shaft assembly of the present invention, one end of the motor shaft assembly 5 is provided with an outer spigot supporting surface 53, and the connection portion with the reducer shaft assembly is provided with an outer spline 52.

Referring to fig. 4, which is a schematic structural diagram of the reducer shaft assembly of the present invention, one end of the reducer assembly has a reducer support bearing 60, and the other end of the reducer assembly has an inner spigot support surface 62 and an inner spline 61.

Referring to fig. 2, which is a schematic sectional view of the present invention, the motor shaft assembly 5 is engaged with the internal spline 61 of the reducer shaft assembly shown in fig. 4 through the external spline 52 of fig. 3, and the spline fitting realizes effective torque transmission as shown by the internal and external spline fitting part 7 of fig. 2.

Fig. 5 shows a preferred embodiment of the structure of the present invention, wherein the motor shaft left support shaft 51 is preferably located near the outer edge surface of the inner spigot support surface 62 on the reducer assembly to increase the support of the contact portion between the reducer shaft assembly and the motor shaft assembly and ensure the stability of the power transmission between the reducer and the reducer, and the gap G between the reducer shaft assembly and the motor shaft assembly is determined by the manufacturing assembly gap of the related dimensions of the reducer shaft assembly and the motor shaft assembly.

FIG. 5 shows a preferred embodiment of the present invention, wherein the distance G between the left support shaft of the motor shaft and the support surface of the inner stop of the reducer assembly is preferably in the range of 3.5-4.5 mm.

The new improved structure design is compared with the prior art, and on one hand, the stability of power transmission can be guaranteed, on the other hand, one supporting bearing can be reduced, and the manufacturing cost of the power assembly connecting structure is effectively reduced.