Differential assembly and vehicle

Abstract

The utility model discloses a differential mechanism assembly which comprises a differential mechanism shell, a planetary gear, a gasket and a gear shaft, the gasket is located between the planetary gear and the differential mechanism shell, the differential mechanism shell is provided with a contact face making contact with the gasket, and the contact face is provided with a first lubricating oil groove containing lubricating media. According to the differential assembly, the service life can be prolonged, and the working reliability can be improved. The utility model further discloses a vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of rear drive axles of electric vehicles, and specifically relates to a differential assembly and a vehicle. Background Art

[0002] The rated load of a certain type of electric drive axle of a logistics vehicle is 2T, the maximum output torque of the axle is 1500-1800N.m, the speed ratio is 8.5, and the maximum input speed of the motor is 9500r / min. The electric drive axle of the logistics vehicle has structural design defects, and multiple differential failures have occurred. The main fault phenomenon is the sintering and locking of the planetary gear shaft and the planetary gear, which will cause the planetary gear shaft to torsion fracture after further development.

[0003] After analysis, the causes of differential failure are summarized as follows:

[0004] a. The inner hole of the planetary gear is not modified, and there is edge contact between the large end hole of the planetary gear and the cross shaft. The average contact stress at the edge of the hole is about 324MPa, and the contact stress is large;

[0005] b. After the differential assembly is assembled, the spherical surface of the planetary gear and the spherical gasket fit perfectly, and the lubricating oil cannot enter and effectively lubricate;

[0006] c. Heat treatment does not meet the standards, causing mutual wear between the planetary shaft and the planetary gear; the cleanliness is too poor, which can easily lead to jamming and poor lubrication.

[0007] In order to improve the quality of the electric drive axle system, the above-mentioned technical problems need to be solved urgently.

[0008] For example, the patent document with publication number CN105650240A discloses an automatic locking differential lock pin device for a rear drive axle of an automobile, which includes a differential case, a straight shaft, planetary gears and axle gears are arranged on the differential case, a locking hole I is arranged on the straight shaft, a locking hole II is arranged on the straight shaft, a locking hole thread is arranged in the locking hole I, a locking pin corresponding to the straight shaft is arranged in the locking hole I and the locking hole II, a locking pin thread is arranged on the locking pin to match the locking hole thread, and a locking nut is arranged at one end of the locking pin. The technical solution disclosed in the patent document also cannot solve the technical problems described above. Utility Model Content

[0009] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a differential assembly, the purpose of which is to improve reliability.

[0010] In order to solve the above technical problems, the technical solution adopted by the utility model is: a differential assembly includes a differential housing, a planetary gear, a gasket and a gear shaft, the gasket is located between the planetary gear and the differential housing, a contact surface in contact with the gasket is provided on the differential housing, and a first lubricating oil groove for accommodating a lubricating medium is provided on the contact surface.

[0011] A plurality of the first lubricating oil grooves are provided.

[0012] The contact surface is provided with an axial hole for inserting the gear shaft, and all first lubricating oil grooves are distributed around the axial hole.

[0013] A second lubricating oil groove is arranged on the outer circumferential surface of the gear shaft, and the second lubricating oil groove is arranged at both ends of the gear shaft.

[0014] Two second lubricating oil grooves are arranged at both ends of the gear shaft.

[0015] The utility model also provides a vehicle, comprising the differential assembly.

[0016] The differential assembly of the utility model can improve the service life and working reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the differential assembly of the utility model;

[0018] Figure 2 is a schematic diagram of the structure of the differential housing;

[0019] Figure 3 It is a schematic diagram of the structure of the gear shaft;

[0020] The markings in the above figures are: 1. differential housing; 2. gear shaft; 3. contact surface; 4. first lubricating oil groove; 5. second lubricating oil groove; 6. drainage surface; 7. planetary gear. DETAILED DESCRIPTION

[0021] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0022] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower" and similar expressions used in this article are for illustrative purposes only.

[0023] It should be noted that, in the following embodiments, the “first” and “second” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequential order of execution, but are merely for the convenience of description.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] like Figures 1 to 3 As shown, the utility model provides a differential assembly, including a differential housing 1, a planetary gear 7, a gasket and a gear shaft 2. A contact surface 3 in contact with the gasket is provided on the differential housing 1, the contact surface 3 is a spherical surface, and a first lubricating oil groove 4 for accommodating a lubricating medium is provided on the contact surface 3.

[0026] Specifically, if Figure 1 As shown, the planetary gear 7, the gasket and the gear shaft 2 are located inside the differential housing 1, the planetary gear 7 is mounted on the gear shaft 2, and the gasket is located between the planetary gear 7 and the differential housing 1. A shaft hole for inserting the end of the gear shaft 2 is provided on the contact surface 3, and a plurality of first lubricating oil grooves 4 are provided, and all the first lubricating oil grooves 4 are distributed around the shaft hole and are evenly distributed along the circumferential direction. By arranging the lubricating oil grooves, lubrication can be improved, and the service life and working reliability can be increased.

[0027] In this embodiment, two first lubricating oil grooves 4 are provided, and the first lubricating oil grooves 4 extend from the inner wall surface of the differential case 1 to the shaft hole on the contact surface 3. The inner wall surface of the differential case 1 is a plane perpendicular to the axis of the shaft hole, and the contact surface 3 is located at the center of the inner wall surface. The two first lubricating oil grooves 4 are symmetrically arranged.

[0028] like Figure 3 As shown, a second lubricating oil groove 5 is provided on the outer circumferential surface of the gear shaft 2, and the second lubricating oil groove 5 is provided at both ends of the gear shaft 2. A drainage surface 6 for guiding the lubricating oil to flow to the second lubricating oil groove 5 is also provided on the gear shaft 2, and the drainage surface 6 is located between the second lubricating oil groove 5 and the outer circumferential surface of the gear shaft 2, and the drainage surface 6 is provided at both ends of the length direction of the second lubricating oil groove 5, and the length direction of the second lubricating oil groove 5 is parallel to the length direction of the gear shaft 2, and the drainage surface 6 is connected to the inner bottom surface of the second lubricating oil groove 5 and the outer circumferential surface of the gear shaft 2, and the drainage surface 6 is an arc surface to ensure that the lubricating oil can flow into the second lubricating oil groove 5.

[0029] In this embodiment, two second lubricating oil grooves 5 are arranged at both ends of the gear shaft 2. The two second lubricating oil grooves 5 located at the same end of the gear shaft 2 are symmetrically arranged. The planetary gear 7 is located in the second lubricating oil groove 5. The second lubricating oil groove 5 contains a lubricating medium to provide lubrication for the planetary gear 7.

[0030] As a preferred embodiment, the inner hole of the planetary gear 7 is optimized to reduce the edge contact stress of the hole. The average hole contact stress after the inner hole is optimized is 198 MPa, and there is no hole edge contact phenomenon.

[0031] The utility model also provides a vehicle, including a differential assembly of the above structure. The specific structure of the differential assembly can be referred to Figures 1 to 3 Since the vehicle of the utility model includes the differential assembly in the above embodiment, it has all the advantages of the above differential assembly.

[0032] In this embodiment, the vehicle is an electric vehicle, the differential assembly is installed on the rear drive axle of the electric vehicle, the differential assembly is connected to two half-axles, and the differential assembly is used to drive the half-axles to rotate.

[0033] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A differential assembly, comprising a differential housing, a planetary gear, a gasket and a gear shaft, wherein the gasket is located between the planetary gear and the differential housing, and a contact surface in contact with the gasket is provided on the differential housing, characterized in that: The contact surface is provided with a first lubricating oil groove for accommodating a lubricating medium.

2. The differential assembly according to claim 1, characterized in that: A plurality of the first lubricating oil grooves are provided.

3. The differential assembly according to claim 2, characterized in that: The contact surface is provided with an axial hole for inserting the gear shaft, and all first lubricating oil grooves are distributed around the axial hole.

4. The differential assembly according to any one of claims 1 to 3, characterized in that: A second lubricating oil groove is arranged on the outer circumferential surface of the gear shaft, and the second lubricating oil groove is arranged at both ends of the gear shaft.

5. The differential assembly according to claim 4, characterized in that: Two second lubricating oil grooves are arranged at both ends of the gear shaft.

6. A vehicle, characterized in that: A differential assembly comprising any one of claims 1 to 5.

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