A driving motor and reducer spline matching structure and vehicle

Abstract

The utility model belongs to the technical field of drive motors, and particularly relates to a drive motor and a reducer spline matching structure and a vehicle, comprising: a drive motor output spline shaft and a reducer assembly input spline shaft, one end of the drive motor output spline shaft is provided with an external spline, and the reducer assembly input spline shaft is an internal spline shaft; the drive motor output spline shaft is used to insert into the internal spline shaft of the reducer assembly, so that the external spline and the internal spline shaft are meshed. The utility model designs the existing drive motor spline shaft as a drive motor output shaft external spline, and designs the reducer assembly input spline shaft as an internal spline shaft, and at the same time increases the depth of the internal spline hole, thereby solving the problem that the current drive motor shaft internal spline and reducer input shaft external spline matching dimensions are relatively tight, and can reduce the difficulty of mechanical processing of the drive motor and the reducer.

Description

Technical Field

[0001] The utility model belongs to the technical field of drive motors, and in particular relates to a drive motor and a speed reducer spline matching structure and a vehicle. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] With the advancement of the national new energy strategy, new energy commercial vehicles are gradually transforming to pure electric vehicles. Commercial vehicles are characterized by large mass and heavy load, which require the drive motor to output higher torque. Considering the cost pressure and layout space of new energy vehicles, it has become a trend to directly connect the drive motor and the reducer through splines, thereby eliminating the drive shaft.

[0004] Figure 1 The figure shows a conventional spline matching connection mode, in which the spline structure of the drive motor 1 is an inner spline 101 of the drive motor shaft, which matches with an outer spline 201 of the reducer input shaft of the reducer assembly 2 .

[0005] The coordination between the drive motor and the reducer requires extremely high coaxiality between the two, which is often at the micron level. Even products from the same batch and processed by the same fixture have different degrees of processing tolerances. The spline shaft will undergo a heat treatment process after machining, which will also cause a certain degree of thermal deformation. Moreover, micron-level deviations in coaxiality will cause stress friction in the motor during high-torque and high-power operation, thereby generating high temperatures, destroying the mechanical properties of metal materials, and ultimately causing premature wear.

[0006] However, since the internal spline of the drive motor shaft is also the rotor shaft of the drive motor, the processing depth of the internal spline hole and the diameter of the spline shaft are limited, and the matching size with the external spline of the reducer input shaft of the reducer assembly is usually tight, and no grease storage space can be reserved. Utility Model Content

[0007] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a driving motor and a speed reducer spline matching structure and a vehicle.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0009] The first aspect of the utility model provides a driving motor and a speed reducer spline matching structure, comprising: a driving motor output spline shaft and a speed reducer assembly input spline shaft;

[0010] The output spline shaft of the driving motor is sleeved with an external spline, and the input spline shaft of the reducer assembly is an internal spline shaft; the external spline of the output spline shaft of the driving motor is used to be inserted into the internal spline shaft of the reducer assembly, so that the external spline is meshed with the meshing internal spline shaft.

[0011] Furthermore, the length of the output spline shaft of the driving motor is smaller than the length of the input spline shaft of the reducer assembly.

[0012] Furthermore, an oil chamber is provided inside the input spline shaft of the reducer assembly.

[0013] Furthermore, the volume of the oil chamber is ≥60ml.

[0014] Furthermore, grease is stored in the oil cavity.

[0015] Furthermore, a sealing ring is sleeved on the output spline shaft of the driving motor.

[0016] Furthermore, the sealing ring is made of rubber.

[0017] Furthermore, the sealing ring and the external spline are arranged at a certain distance.

[0018] Furthermore, the output spline shaft of the driving motor is the rotor shaft of the driving motor.

[0019] The second aspect of the utility model provides a vehicle, which adopts a driving motor as a power source or an auxiliary power source, and uses the driving motor and the speed reducer spline matching structure provided by the first aspect of the utility model.

[0020] One or more of the above technical solutions have the following beneficial effects:

[0021] (1) The utility model designs the existing spline shaft of the drive motor as an external spline of the drive motor output shaft, and designs the input spline shaft of the reducer assembly as an internal spline shaft, and at the same time increases the depth of the internal spline hole, thereby solving the problem of tight dimensions caused by the current use of the internal spline of the drive motor shaft and the external spline of the reducer input shaft, and can reduce the difficulty of mechanical processing of the drive motor and the reducer.

[0022] (2) The utility model adds a grease storage oil chamber inside the input spline shaft of the reducer assembly. During movement, the high temperature of the spline causes the grease to dissolve. The dissolved grease continuously flows through the spline meshing surface, which can take away the heat generated by friction, thereby cooling the drive motor and the reducer spline shaft, and solving the problem of spline tooth burning and severe wear during movement.

[0023] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 This is a schematic diagram of the spline connection between the existing drive motor and reducer.

[0026] Figure 2 This is an overall schematic diagram of the spline matching structure of a drive motor and a reducer in Example 1.

[0027] Figure 3 This is a detailed diagram of the spline matching structure of a drive motor and a reducer in Example 1.

[0028] In the figure, 1, drive motor, 101 drive motor shaft inner spline, 2, reducer assembly, 201 reducer input shaft outer spline, 3, drive motor output spline shaft, 4, reducer assembly input spline shaft, 5, outer spline, 6, inner spline shaft, 7, oil chamber, 8, sealing ring. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1

[0031] like Figure 2 , Figure 3 As shown, the utility model proposes a driving motor and a speed reducer spline matching structure, comprising: a driving motor output spline shaft 3 and a speed reducer assembly input spline shaft 4;

[0032] The output spline shaft 3 of the driving motor is provided with an external spline 5, and the input spline shaft of the reducer assembly is an internal spline shaft 6; the external spline 5 of the output spline shaft of the driving motor is used to be inserted into the internal spline shaft 6 of the reducer assembly, so that the external spline is meshed with the meshing internal spline shaft.

[0033] The utility model makes targeted improvements to the spline matching mode between the drive motor and the reducer, designs the spline shaft of the existing drive motor as the external spline of the drive motor output shaft, designs the input spline shaft of the reducer assembly as the internal spline shaft, and increases the depth of the internal spline hole, thereby solving the problem of the tight matching size between the internal spline of the drive motor shaft and the external spline of the reducer input shaft, and can reduce the difficulty of mechanical processing of the drive motor and the reducer.

[0034] As a further technical solution, the output spline shaft 3 of the driving motor is the rotor shaft of the driving motor, and a longitudinal keyway, i.e., an external spline 5, is provided on one end surface of the rotor shaft; a connecting hole is provided inside the input spline shaft 4 of the reducer assembly along its axial direction, and a keyway is provided on the inner wall of the input spline shaft 4 of the reducer assembly along its axial direction, and the connecting hole is connected to the open end of the input spline shaft 4 of the reducer assembly; so that after the output spline shaft 3 of the driving motor extends into the interior of the input spline shaft 4 of the reducer assembly from the open end thereof, the external spline 5 engages with the internal spline shaft 6.

[0035] The length of the output spline shaft 3 of the drive motor is smaller than the length of the input spline shaft 4 of the reducer assembly, so that an oil chamber 7 is formed between it and the inner spline shaft 6 of the reducer assembly, and the oil chamber 7 is connected to the connecting hole; and by increasing the depth of the inner spline hole, the oil chamber volume of the inner spline shaft is ≥60ml. Grease is stored in the oil chamber 7, and the grease is G-4700 extreme pressure synthetic grease (high viscosity high temperature grease).

[0036] The utility model takes into account the stress friction caused by the machining tolerance of the motor during high torque and high power operation, which generates high-temperature grease during the spline movement. The dissolved grease continuously flows through the spline meshing surface, which can not only reduce the friction coefficient of the mechanical surface, but also take away the heat generated by friction, so that the spline mating surface can be mechanically run-in smoothly. This embodiment uses a vehicle loaded for 30,000 kilometers for reliability verification. After the motor and reducer are disassembled, the spline mating surface is in good condition, the service life of the spline mating is extended by 3-5 times, and there is no abnormal noise during operation.

[0037] As a further technical solution, a sealing ring 8 is sleeved on the output spline shaft 3 of the driving motor. The sealing ring 8 is arranged at a certain distance from the external spline 5. The sealing ring 8 is an "O" type rubber sealing ring used to seal grease. At the same time, the sealing ring can also prevent external pollution after the motor wades through water to a certain extent.

[0038] By using the above structure, the utility model can extend the service life of the spline matching structure by 3-5 times, and reduce the abnormal noise generated by the electric drive module (drive motor + power transmission), thereby improving the driving comfort of the vehicle. In terms of economic value, it can reduce the difficulty of mechanical processing of the drive motor and reducer, reduce manufacturing costs, and significantly reduce the costs of after-sales maintenance of the company.

[0039] Embodiment 2

[0040] This embodiment provides a vehicle, which uses a drive motor as a power source or an auxiliary power source, and uses the drive motor and reducer spline matching structure in the first embodiment.

[0041] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A spline matching structure between a drive motor and a reducer, characterized in that: include: The output spline shaft of the driving motor and the input spline shaft of the reducer assembly; One end of the output spline shaft of the drive motor is provided with an external spline, and the input spline shaft of the reducer assembly is an internal spline shaft; the output spline shaft of the drive motor is used to be inserted into the internal spline shaft of the reducer assembly so that the external spline is meshed with the internal spline shaft.

2. The driving motor and reducer spline matching structure according to claim 1 is characterized in that: The length of the output spline shaft of the driving motor is smaller than the length of the input spline shaft of the reducer assembly.

3. The driving motor and reducer spline matching structure according to claim 1 is characterized in that: An oil chamber is provided inside the input spline shaft of the reducer assembly.

4. The driving motor and reducer spline matching structure according to claim 3 is characterized in that: The volume of the oil chamber is ≥60ml.

5. The driving motor and reducer spline matching structure according to claim 3, characterized in that: Lubricating grease is stored in the oil cavity.

6. The driving motor and reducer spline matching structure according to claim 1, characterized in that: A sealing ring is sleeved on the output spline shaft of the driving motor.

7. The driving motor and reducer spline matching structure according to claim 6, characterized in that: The sealing ring is made of rubber.

8. The driving motor and reducer spline matching structure according to claim 6, characterized in that: The sealing ring is arranged at a certain distance from the external spline.

9. The driving motor and reducer spline matching structure according to claim 1, characterized in that: The output spline shaft of the driving motor is the rotor shaft of the driving motor.

10. A vehicle, using a drive motor as a power source or an auxiliary power source, characterized in that: Use the drive motor and reducer spline matching structure described in any one of claims 1 to 9.

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