阅读说明：本技术 一种防启停异响的半轴 (Half shaft capable of preventing abnormal sound during starting and stopping ) 是由 吴鑫玮 于 2021-09-24 设计创作，主要内容包括：本发明提供一种防启停异响的半轴,包括外星轮部和从外星轮部的端部一体轴向延伸出的柄部,外星轮部具有用于和轮毂面接触配合的配合端面,柄部用于和轮毂花键配合,配合端面朝向轮毂的表面上涂覆有低摩擦涂层。本申请中,通过在外星轮部的配合端面涂覆低摩擦涂层来有效降低外星轮部的配合端面与轮毂端面之间的摩擦,有效防止启停异响,提高整车舒适性；采用在外星轮部的配合端面直接涂覆低摩擦涂层的方式,使得低摩擦涂层有效附着在外星轮部的端面上,附着力好、不易脱落,也不存在断裂的问题,低成本地实现了有效防止端面异响。(The invention provides a half shaft capable of preventing abnormal starting and stopping sounds, which comprises an outer star wheel part and a handle part, wherein the handle part axially extends from the end part of the outer star wheel part integrally, the outer star wheel part is provided with a matching end surface used for being in contact fit with a hub surface, the handle part is used for being in spline fit with the hub, and the surface, facing a hub, of the matching end surface is coated with a low-friction coating. According to the application, the friction between the matching end face of the outer star wheel part and the end face of the hub is effectively reduced by coating the low-friction coating on the matching end face of the outer star wheel part, abnormal starting and stopping sounds are effectively prevented, and the comfort of the whole vehicle is improved; the mode of directly coating the low-friction coating on the matching end surface of the outer star wheel part is adopted, so that the low-friction coating is effectively attached to the end surface of the outer star wheel part, the adhesive force is good, the coating is not easy to fall off, the problem of fracture does not exist, and the effect of effectively preventing abnormal sound of the end surface is realized at low cost.)

1. The utility model provides a prevent half axle of start-stop abnormal sound, includes outer star portion (10) and handle portion (20) that extends from the integrative axial of the end of outer star portion (10), outer star portion (10) have be used for with wheel hub face contact complex counterface (11), handle portion (20) are used for with wheel hub spline fit, its characterized in that: the surface of the mating end face (11) facing the hub is coated with a low friction coating (30).

2. The axle shaft of claim 1, wherein: the low-friction coating (30) is a polytetrafluoroethylene coating.

3. The axle shaft of claim 1, wherein: the outer circumferential surface of the handle part (20) is provided with an external spline (40), and the external spline (40) comprises a plurality of tooth parts (41) which are distributed along the circumferential direction of the handle part (20) at intervals.

4. The axle shaft of claim 3, wherein: the outer spline (40) is a stepped spline, the stepped spline comprises a first spline shaft part (42) and a second spline shaft part (43), and the outer star wheel part (10), the first spline shaft part (42) and the second spline shaft part (43) are sequentially connected; the tooth tip diameter of the tooth portion (41) in the first spline shaft portion (42) is equal to the tooth tip diameter of the tooth portion (41) in the second spline shaft portion (43), and the tooth root diameter of the tooth portion (41) in the first spline shaft portion (42) is larger than the tooth root diameter of the tooth portion (41) in the second spline shaft portion (43).

Technical Field

The invention relates to the field of automobile transmission, in particular to a half shaft capable of preventing abnormal starting and stopping sounds.

Background

Currently, in automotive transmission systems, half shafts and hubs are assembled together to achieve the function of transmitting torque. Commercially, axle shafts typically include an outer star wheel portion and a shank portion (i.e., shaft portion), with the shank portion of the axle shaft and the wheel hub being most often in a splined engagement. However, due to the clearance of spline fit and the rigidity of the handle part of the half shaft, friction is generated between the end surface of the hub and the end surface of the outer star wheel part of the half shaft, and the abnormal sound of start and stop is easily generated under the condition, so that the comfort of the whole vehicle is affected.

In view of the above problems, the prior art provides several solutions, each of which has certain problems.

1. There is a scheme of coating Molycote (lubricating grease): coating Molycote on the end face of the outer star wheel part of the half shaft; however, Molycote is easily worn and the moist environment easily affects the adhesion, thereby reducing the noise reduction effect.

2. The proposal of adding the gasket is as follows: a gasket positioned between the end face of the hub and the end face of the besides-star wheel part of the half shaft is sleeved on the handle part of the half shaft, and the surface of the gasket is coated with coatings which are not easy to fall off, such as polytetrafluoroethylene; however, the gasket itself has low strength and is easily broken.

3. The scheme of adopting the end face spline comprises the following steps: disposing a spline at the end; however, the application cost of the design is very high, and the design is not suitable for middle and low-end products.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a half shaft for preventing abnormal start and stop sounds, which can achieve effective noise reduction at low cost.

In order to achieve the purpose, the invention provides a starting and stopping abnormal sound preventing half shaft which comprises an outer star wheel part and a handle part, wherein the handle part extends axially from the end part of the outer star wheel part integrally, the outer star wheel part is provided with a matching end surface used for being in contact fit with a hub surface, the handle part is used for being in spline fit with the hub, and the surface, facing to the hub, of the matching end surface is coated with a low-friction coating.

Further, the low friction coating is a polytetrafluoroethylene coating.

Further, the outer peripheral surface of the handle portion is provided with an external spline, and the external spline comprises a plurality of tooth portions which are distributed at intervals along the circumferential direction of the handle portion.

Further, the external spline is a stepped spline, the stepped spline comprises a first spline shaft part and a second spline shaft part, and the external star wheel part, the first spline shaft part and the second spline shaft part are sequentially connected; the tooth top diameter of the first spline shaft middle tooth part is equal to the tooth top diameter of the second spline shaft middle tooth part, and the tooth root diameter of the first spline shaft middle tooth part is larger than the tooth root diameter of the second spline shaft middle tooth part.

As mentioned above, the half shaft for preventing the abnormal start and stop sound has the following beneficial effects:

according to the application, the friction between the matching end face of the outer star wheel part and the end face of the hub is effectively reduced by coating the low-friction coating on the matching end face of the outer star wheel part, abnormal starting and stopping sounds are effectively prevented, and the comfort of the whole vehicle is improved; the mode of directly coating the low-friction coating on the matching end surface of the outer star wheel part is adopted, so that the low-friction coating is effectively attached to the end surface of the outer star wheel part, the adhesive force is good, the coating is not easy to fall off, the problem of fracture does not exist, and the effect of effectively preventing abnormal sound of the end surface is realized at low cost.

Drawings

Fig. 1 and 2 are schematic structural views of half shafts in different views in the present application.

FIG. 3 is a front view of the half shaft of the present application.

FIG. 4 is a cross-sectional view of the half shaft of the present application.

Description of the element reference numerals

10 outer star wheel part

11 mating end face

20 handle part

30 low friction coating

40 external spline

41 tooth system

42 first splined shaft portion

43 second spline shaft part

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

The application provides a half shaft for preventing abnormal sound of starting and stopping, which is called as the half shaft for short below and is used for being assembled with a wheel hub. As shown in FIGS. 1 and 2, the half axle related to the present application comprises an outer star wheel portion 10 and a handle portion 20 integrally extending from the right end of the outer star wheel portion 10 in a rightward axial direction, and the outer star wheel portion 10 and the handle portion 20 are integrally formed, so that the half axle is an integrally formed part. The right end of the outer star wheel part 10 is provided with a matching end surface 11, and the matching end surface 11 is used for surface contact matching with the left end surface of the wheel hub; the outer circumference of the handle part 20 is provided with an external spline 40, the handle part 20 is used for being inserted into the assembly hole of the wheel hub, and the external spline 40 on the handle part 20 is matched with the internal spline on the inner circumference of the assembly hole of the wheel hub. In particular, as shown in fig. 2 and 4, the surface of the mating end face 11 at the right end of the outer planetary gear portion 10 facing the hub is coated with the low friction coating 30, and the low friction coating 30 is preferably a teflon coating and has high adhesion.

In this application, the half shaft and the hub are assembled together through splines, and both rotate together to transmit torque. In the working process, especially at the moment of starting and stopping, friction is generated between the matching end surface 11 at the right end of the outer star wheel part 10 and the left end surface of the wheel hub, and the friction between the matching end surface 11 of the outer star wheel part 10 and the left end surface of the wheel hub is effectively reduced by coating the low-friction coating 30 on the matching end surface 11 of the outer star wheel part 10, so that abnormal starting and stopping sounds caused by large friction are effectively prevented, and the comfort of the whole vehicle is improved. In addition, the mode that the low-friction coating 30 is directly coated on the matching end face 11 of the outer star wheel portion 10 is adopted, so that the low-friction coating 30 is effectively attached to the end face of the outer star wheel portion 10, the adhesive force is good, the coating is not prone to falling off, the problem of fracture does not exist, and the effect of effectively preventing abnormal sound of the end face is achieved at low cost.

Further, as shown in fig. 1 to 3, the external spline 40 on the outer peripheral surface of the shank 20 includes a plurality of teeth 41 spaced apart in the circumferential direction of the shank 20, and the external spline 40 on the outer peripheral surface of the shank 20 is a stepped spline. Specifically, the stepped spline includes a first spline shaft portion 42 and a second spline shaft portion 43, and the outer star wheel portion 10, the first spline shaft portion 42, and the second spline shaft portion 43 are sequentially connected from left to right; the tip diameter of the tooth portion 41 in the first spline shaft portion 42 is equal to the tip diameter of the tooth portion 41 in the second spline shaft portion 43, and the root diameter of the tooth portion 41 in the first spline shaft portion 42 is larger than the root diameter of the tooth portion 41 in the second spline shaft portion 43. Thus, the external spline 40 is relatively thickened at the first spline shaft portion 42, which can improve the rigidity of the external spline 40 on the shank portion 20 and reduce deformation; moreover, it can be known from CAE analysis that the maximum point of the external spline 40 on the handle 20 is the tooth root of the tooth portion 41 attached to the hub, and after the first spline shaft portion 42 is relatively thickened, the rigidity of the tooth portion 41 on the handle can be improved at the tooth root, so that the deformation of the mating end surface 11 at the right end of the external planetary gear portion 10 can be effectively avoided, and the risk of abnormal start-stop sound is further reduced.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.