Antifriction structure between besides-star wheel and hub bearing

Abstract

The utility model relates to an antifriction structure between a besides-star wheel and a hub bearing, a connecting handle is arranged on one side of the end face of a wheel body of the besides-star wheel, the connecting handle comprises a spline shaft section, the antifriction structure comprises an antifriction gasket, a sliding shaft section and a step shaft section, the sliding shaft section and the step shaft section are both arranged on the connecting handle, and the sliding shaft section is arranged on the front side of the end face of the wheel body of the besides-star wheel. The step shaft section is located on the front end side of the sliding shaft section and located on the rear side of the spline shaft section, the outer diameter of the step shaft section is larger than that of the sliding shaft section, a limiting blocking face is formed between the step shaft section and the sliding shaft section, and the maximum outer diameter of the section, in front of the step shaft section, of the connecting handle is smaller than the outer diameter of the step shaft section. The anti-friction gasket is an elastic circular ring gasket, the sliding shaft section is sleeved with the anti-friction gasket, the anti-friction gasket can freely move on the sliding shaft section, the inner diameter of the anti-friction gasket is smaller than the outer diameter of the step shaft section, and the difference value between the inner diameter of the anti-friction gasket and the outer diameter of the step shaft section ranges from 0.2 mm to 0.4 mm; the hub bearing is installed on the connecting handle, and the end face of the hub bearing tightly presses the antifriction gasket on the end face of the wheel body.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a friction reduction structure between an outer star wheel and a wheel hub bearing. Background Art

[0002] When two objects come into contact, adhesion nodes are formed on the contact surface due to the adhesion effect. However, when the objects are subjected to load and slide relative to each other, shear fractures occur at the adhesion nodes, causing the fracture surface to vibrate, and the vibration produces sound. When the friction coefficient between the contact surfaces is large, relative sliding will produce relatively drastic changes in friction force, which will generate noise.

[0003] Among automotive parts, the outer star wheel in the transmission shaft assembly has a connecting handle, which is matched with the wheel hub bearing through a spline. The spline itself has a matching clearance, and the elastic deformation of the spline shaft causes a slight relative sliding between the contact surface of the wheel hub bearing and the end face of the outer star wheel body under starting and reversing conditions. According to the above theory and actual vehicle use, the friction between the wheel hub bearing and the end face of the outer star wheel body produces abnormal noise. This will not only affect the driver's judgment and the comfort of the passengers, but also affect the service life of the car.

[0004] In the prior art, a friction-reducing gasket is arranged between the wheel hub bearing and the outer star wheel. The friction-reducing gasket adopts two types: claw type and riveted type (with flange / flanged edge) to stably install on the connecting handle of the outer star wheel. For example, in patents with application numbers CN201610806308.4, CN201820523001.8 and CN201610171726.0, claw type friction-reducing gaskets are adopted. The inner ring of the friction-reducing gasket has three or more claws, which are stably installed on the connecting handle through the claws. However, this design will cause cracking due to stress concentration at the transition between the claw and the ring. For another example, in the patent with application number CN201920311943.4, a structure similar to a riveted anti-friction gasket is disclosed, in which an annular flange is arranged along the periphery on one side of the anti-friction gasket, which is used to tightly fit the part of the spherical shell part close to the handle part. The fitting force between the annular flange and the spherical shell part can ensure that the anti-friction gasket does not slide or deviate, thereby avoiding mutual friction between the end face of the inner ring of the bearing and the end face of the spherical shell part. However, this riveted anti-friction gasket is also prone to cracking due to stress concentration due to its complex structure. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a friction reduction structure between the outer star wheel and the hub bearing, which has a simple structure and can eliminate stress concentration while avoiding cracking of the friction reduction gasket.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a friction reduction structure between an outer star wheel and a wheel hub bearing, wherein one side of the wheel body end face of the outer star wheel has an integrated connecting handle, the connecting handle is used to connect with the wheel hub bearing, the connecting handle includes a spline shaft section used to connect with the wheel hub bearing, the wheel hub bearing is mounted on the spline shaft section and is opposite to the wheel body end face of the outer star wheel, the friction reduction structure includes a friction reduction gasket, and a sliding shaft section and a step shaft section both located on the connecting handle, the sliding shaft section is located on the front side of the wheel body end face of the outer star wheel, and the step shaft section is located on the front end side of the sliding shaft section , and is located at the rear side of the spline shaft section, the outer diameter of the step shaft section is larger than the outer diameter of the sliding shaft section, and a limit stop surface is formed between the two, the maximum outer diameter of the section of the connecting handle before the step shaft section is smaller than the outer diameter of the step shaft section, the anti-friction gasket is an elastic annular gasket, the anti-friction gasket is sleeved on the sliding shaft section, and can move freely on the sliding shaft section, the inner diameter of the anti-friction gasket is smaller than the outer diameter of the step shaft section, and the difference between the two is 0.2-0.4mm; the wheel hub bearing is installed on the connecting handle, and its end face presses the anti-friction gasket against the end face of the wheel body.

[0007] Furthermore, there is a smooth transition between the step shaft section and the spline shaft section.

[0008] Furthermore, the anti-friction gasket comprises a gasket base and a friction-reducing and wear-resistant material coating arranged on both side end surfaces of the gasket base.

[0009] Furthermore, the thickness of the gasket substrate is 1 mm, and the thickness of the friction-reducing and wear-resistant material coating is 25-35 μm.

[0010] Furthermore, the material of the gasket substrate is 65Mn spring steel or SPCC cold-rolled carbon steel.

[0011] Furthermore, the friction-reducing and wear-resistant material coating is a Xylan Teflon coating or a DuPont D6600 coating.

[0012] As described above, the friction reduction structure of the utility model has the following beneficial effects:

[0013] It can solve the abnormal noise problem when the vehicle starts and reverses; the anti-friction gasket has a simple structure, a simple manufacturing process, a low manufacturing cost, and will not cause cracking due to stress concentration. It has a good effect in eliminating abnormal noise and solving the problem of gasket cracking. The outer star wheel structure matched with it also ensures that the anti-friction gasket and the connecting handle are supplied in one piece, which improves the installation efficiency of the vehicle factory; it has a good promotion and practical value, and after promotion and application, it can improve market competitiveness. In summary, the utility model effectively overcomes the various shortcomings of the existing technology and has a high industrial utilization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1The utility model is a schematic diagram of the installation of the anti-friction gasket between the wheel hub bearing and the outer star wheel.

[0015] Figure 2 It is a structural schematic diagram of the friction-reducing pad in the utility model.

[0016] Figure 3 It is a full cross-sectional view of the anti-friction gasket in the utility model.

[0017] Figure 4 The schematic diagram of the structure of the sliding shaft section and the step shaft section in the utility model is

[0018] Figure 5 for Figure 4 Enlarged view of circle A.

[0019] Figure 6 Schematic diagram of the installation of the anti-friction gasket on the sliding shaft section in the utility model

[0020] Figure 7 for Figure 6 Enlarged view of circle B.

[0021] Description of Figure Numbers

[0022] 1 Wheel bearing

[0023] 2 Alien Wheel

[0024] 21 Wheel end face

[0025] 3 Connecting handle

[0026] 31 Threaded shaft segment

[0027] 32 Spline shaft segment

[0028] 33 Step shaft segment

[0029] 34 Sliding shaft segment

[0030] 35 Limit stop surface

[0031] 36 Undercut

[0032] 4 Anti-friction pads DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0034] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0035] See also Figures 1 to 7 The utility model provides a friction reduction structure between an outer star wheel 2 and a wheel hub bearing 1. An integral connecting handle 3 is provided on one side of the wheel body end face 21 of the outer star wheel 2. The connecting handle 3 is used to connect with the wheel hub bearing 1. The connecting handle 3 and the outer star wheel 2 are an integral part and are part of a transmission shaft assembly. The connecting handle 3 includes a spline shaft section 32 for connecting with the wheel hub bearing 1. The spline shaft section 32 is provided with a spline, and the connecting handle 3 located in front of the spline shaft section 32 can be collectively referred to as a front section. The front section generally includes a threaded shaft section 31. During installation, the wheel hub bearing 1 is installed on the spline shaft section 32, and the two are driven by the spline. The wheel hub bearing 1 is kept opposite to the wheel body end face 21 of the outer star wheel 2, and is screwed on the threaded shaft section 31 by a nut, and the wheel hub bearing 1 is pressed to make it abut against the wheel body end face 21 of the outer star wheel 2 to keep it axially fixed.

[0036] The friction reduction structure of the utility model includes a friction reduction pad 4, and a sliding shaft section 34 and a step shaft section 33 both located on the connecting handle 3. The sliding shaft section 34 is located on the front side of the wheel body end face 21 of the outer star wheel 2, and the step shaft section 33 is located on the front end side of the sliding shaft section 34 and on the rear side of the spline shaft section 32. The outer diameter of the step shaft section 33 is larger than the outer diameter of the sliding shaft section 34, and a limit stop surface 35 is formed between the two. The maximum outer diameter of the section of the connecting handle 3 before the step shaft section 33 is smaller than the step shaft section 33, the anti-friction gasket 4 is an elastic annular gasket, the anti-friction gasket 4 is sleeved on the sliding shaft segment 34, and can move freely on the sliding shaft segment 34, that is, the inner hole diameter of the anti-friction gasket 4 is larger than the outer diameter of the sliding shaft segment 34, and the thickness is smaller than the length of the sliding shaft segment 34, the inner diameter of the anti-friction gasket 4 is smaller than the outer diameter of the step shaft segment 33, and the difference between the two is 0.2 to 0.4 mm; the wheel hub bearing 1 is installed on the connecting handle 3, and its end face presses the anti-friction gasket 4 against the end face 21 of the wheel body.

[0037] The friction-reducing pad 4 of the utility model, when used, refers to Figure 1 , Figure 6 and Figure 7 The anti-friction gasket 4 is first assembled with the outer star wheel 2 and then transported and assembled together. Specifically, the anti-friction gasket 4 is inserted from the front end of the connecting handle 3, and a special pressing tool, such as a sleeve structure, is used to press the anti-friction gasket through the threaded shaft section 31, the spline shaft section 32 and the step shaft section 33. The anti-friction gasket 4 will be deformed to a certain extent when passing through the step shaft section 33, and then be pressed into the sliding shaft section 34. Due to the presence of the limiting stop surface 35 between the step shaft section 33 and the sliding shaft section 34, the anti-friction gasket 4 will not fall out of the step shaft section 33, thereby achieving stable installation of the anti-friction gasket 4 on the connecting handle 3, and will not fall out during subsequent transportation and assembly work. Therefore, the manufacturer can manufacture and assemble the anti-friction gasket 4 and the outer star wheel 2 in advance, and then send the whole to the customer for assembly, avoiding the need for the customer to pair and assemble the anti-friction gasket 4 on site.

[0038] When assembling the hub bearing 1 and the outer star wheel 2, refer to Figure 1 The wheel hub bearing 1 is compressed by the locking nut, and the wheel hub bearing 1 compresses the friction-reducing gasket 4 onto the wheel body end face 21. The two end faces of the friction-reducing gasket 4 are respectively kept in good contact with the end face of the wheel hub bearing 1 and the wheel body end face 21, so as to avoid direct contact between the wheel hub bearing 1 and the wheel body end face 21 of the outer star wheel 2, and change the friction characteristics of the contact surface between the wheel hub bearing 1 and the outer star wheel 2, thereby eliminating the abnormal noise caused by the friction between the wheel hub bearing 1 and the wheel body end face 21 of the outer star wheel 2 under starting and reversing conditions. Moreover, compared with the prior art, the traditional design concept is changed, and the friction-reducing gasket 4 is a simple annular structure gasket, and the front and rear end faces are planes and parallel to each other. When the friction is reduced between the wheel hub bearing 1 and the outer star wheel 2, there is no stress concentration on the friction-reducing gasket 4, thereby avoiding the cracking of the friction-reducing gasket 4, and the operation is stable and reliable, and the service life is long.

[0039] In this embodiment, see Figure 5 and Figure 6As a preferred design, there is a smooth transition between the step shaft section 33 and the spline shaft section 32, and the circumference of the front end portion of the step shaft section 33 gradually increases from front to back, so that the anti-friction gasket 4 can pass through the step shaft section 33 and is easy to assemble. At the same time, the transition section structure reduces the stress concentration of the connecting handle 3 and makes the outer star wheel stronger. The limit stop surface 35 between the step shaft section 33 and the sliding shaft section 34 can be processed into a chamfer, and of course it can also be processed into a rounded corner. When processing the step shaft section 33 and the sliding shaft section 34, a tool withdrawal groove 36 structure is processed on the wheel body end face 21 of the outer star wheel 2 to facilitate tool withdrawal after hard turning. In general outer star wheel structures, the transition form from the wheel body end face 21 to the connecting handle 3 is a rounded transition. The rounded corner structure easily causes the anti-friction gasket 4 to fail to be compacted and cannot completely contact the wheel body end face 21. By adding the backing groove 36, the outer surface of the sliding shaft section 34 near the wheel body end face 21 can be completely straight along the axial direction, or have a small curvature when it is an arc shape, so that the anti-friction gasket 4 can be compacted on the wheel body end face 21, and the inner hole of the anti-friction gasket 4 will not be squeezed by the part of the sliding shaft section 34 near the wheel body end face 21, thereby avoiding gasket deformation and affecting the friction reduction performance.

[0040] In this embodiment, see Figure 2 and Figure 3 As a preferred design, the anti-friction gasket 4 includes a gasket substrate and a friction-reducing and wear-resistant material coating arranged on both side end surfaces of the gasket substrate. The material of the gasket substrate can be 65Mn spring steel or SPCC cold-rolled carbon steel, which is formed by stamping and can be heat-treated or not. The thickness of the gasket substrate is preferably 1mm. The thickness of the friction-reducing and wear-resistant material coating is 25 to 35μm, and Xylan Teflon coating or DuPont D6600 coating can be used to achieve a good friction reduction effect. In other embodiments, the friction-reducing gasket 4 can also be made of other suitable materials and thickness dimensions.

[0041] The friction reduction structure between the outer star wheel and the hub bearing of the utility model has the following beneficial effects:

[0042] It can solve the abnormal noise problem when the vehicle starts and reverses; the anti-friction gasket 4 has a simple structure, a simple manufacturing process, a low manufacturing cost, and will not cause stress to crack. It has a good effect in eliminating abnormal noise and solving the gasket cracking problem. The outer star wheel 2 structure matched with it also ensures that the anti-friction gasket 4 and the connecting handle 3 are supplied in one piece, which improves the installation efficiency of the vehicle factory; it has a good promotion and practical value, and after promotion and application, it can improve market competitiveness. In summary, the utility model effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A friction reduction structure between an outer star wheel and a wheel hub bearing, wherein one side of a wheel body end face (21) of the outer star wheel (2) has an integral connecting handle (3), the connecting handle (3) is used to connect with the wheel hub bearing (1), the connecting handle (3) comprises a spline shaft section (32) used to connect with the wheel hub bearing (1), the wheel hub bearing (1) is mounted on the spline shaft section (32) and is opposite to the wheel body end face (21) of the outer star wheel (2), characterized in that: The friction reduction structure comprises a friction reduction gasket (4), and a sliding shaft section (34) and a step shaft section (33) both located on the connecting handle (3); the sliding shaft section (34) is located on the front side of the wheel body end surface (21) of the outer star wheel (2); the step shaft section (33) is located on the front end side of the sliding shaft section (34) and on the rear side of the spline shaft section (32); the outer diameter of the step shaft section (33) is larger than the outer diameter of the sliding shaft section (34), and a limit stop surface (35) is formed between the two; the connecting handle (3) is located on the step shaft section (3 3) The maximum outer diameter of the previous sections is smaller than the outer diameter of the step shaft section (33); the anti-friction gasket (4) is an elastic annular gasket; the anti-friction gasket (4) is sleeved on the sliding shaft section (34) and can move freely on the sliding shaft section (34); the inner diameter of the anti-friction gasket (4) is smaller than the outer diameter of the step shaft section (33), and the difference between the two is 0.2 to 0.4 mm; the hub bearing (1) is installed on the connecting handle (3), and its end face presses the anti-friction gasket (4) onto the end face (21) of the wheel body.

2. The friction reducing structure according to claim 1, characterized in that: There is a smooth transition between the step shaft section (33) and the spline shaft section (32).

3. The friction reducing structure according to claim 1, characterized in that: The anti-friction gasket (4) comprises a gasket base and a friction-reducing and wear-resistant material coating arranged on both side end surfaces of the gasket base.

4. The friction reducing structure according to claim 3, characterized in that: The thickness of the gasket substrate is 1 mm, and the thickness of the friction-reducing and wear-resistant material coating is 25-35 μm.

5. The friction reducing structure according to claim 3, characterized in that: The material of the gasket substrate is 65Mn spring steel or SPCC cold-rolled carbon steel.

6. The friction reducing structure according to claim 3 or 5, characterized in that: The friction-reducing and wear-resistant material coating is a Xylan Teflon coating or a DuPont D6600 coating.

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