A high-strength large swing angle dust cover suitable for use with a rear drive shaft

Abstract

The application provides a high-strength large-angle dust cover suitable for rear drive shafts, which comprises a large-diameter section and a small-diameter section, the small-diameter end is provided with a drive shaft connecting part, and the large-diameter end is provided with a shell connecting part; a transition section is arranged between the large-diameter section and the small-diameter section, a plurality of wave crest structures are arranged on the transition section, a wave trough structure is formed between two adjacent wave crest structures, each wave crest structure comprises a large-diameter end wave crest surface and a small-diameter end wave crest surface, a plurality of large-diameter end buffer lines are arranged on the large-diameter end wave crest surface close to the large-diameter section, and a large-diameter end drainage groove is formed between two adjacent large-diameter end buffer lines; a plurality of small-diameter end buffer lines are arranged on the small-diameter end wave crest surface close to the small-diameter end, and a small-diameter end drainage groove is formed between two adjacent small-diameter end buffer lines. Under the working condition of effectively reducing the occupied space, the internal volume and the amount of lubricating grease, the application is not prone to cracks and wear, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dust covers for rear drive shafts, in particular to a high-strength large-angle dust cover suitable for rear drive shafts. BACKGROUND

[0002] The driving wheel of a vehicle is connected to a drive shaft for receiving driving force from an engine or motor, and a constant-velocity universal joint is installed between the drive shaft and the driving wheel of the vehicle to stably transmit the driving force from the engine or motor to the driving wheel of the vehicle without being affected by the angle change of the driving wheel. Since the constant-velocity universal joint of the vehicle having the above structure slides while rotating at high speed, a lubricant such as grease is required to satisfy the lubrication requirement of this part, and a dust cover is provided to prevent contamination and leakage of the lubricant. However, in the prior art, the angle change of the driving wheel causes the dust cover to be stretched or compressed, which causes the dust cover to strain, stress concentrate, deform, displace, and generate friction, resulting in premature cracking and wear of the dust cover, especially in the working condition of large-angle and high-strength use, the service life is short. Therefore, it is necessary to develop a dust cover that can adapt to large-angle changes. SUMMARY

[0003] Therefore, the application aims to overcome the defects in the prior art and provide a high-strength large-angle dust cover suitable for rear drive shafts.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A high-strength large-angle dust cover suitable for rear drive shafts, comprising a large-diameter section connected to a housing and a small-diameter section connected to a drive shaft, the large-diameter section and the small-diameter section being on the same center axis, the small-diameter end being provided with a drive shaft connecting portion, and the large-diameter end being provided with a housing connecting portion; a transition section is provided between the large-diameter section and the small-diameter section, and a plurality of wave peak structures are provided on the transition section, a wave valley structure is formed between adjacent two wave peak structures, each wave peak structure comprises a large-diameter end wave peak surface and a small-diameter end wave peak surface, a plurality of large-diameter end buffer lines are provided on the large-diameter end wave peak surface close to the large-diameter section, and a large-diameter end drainage groove is formed between adjacent two large-diameter end buffer lines; a plurality of small-diameter end buffer lines are provided on the small-diameter end wave peak surface close to the small-diameter end, and a small-diameter end drainage groove is formed between adjacent two small-diameter end buffer lines.

[0006] Further, the wave valley structure is an arc-shaped groove.

[0007] Further, the two side walls of the large-diameter end drainage groove are inclined surfaces.

[0008] Further, the two side walls of the small-diameter end drainage groove are inclined surfaces.

[0009] Further, the outer surface of the shell connecting part is provided with a shell end fixing groove.

[0010] Further, the outer surface of the driving shaft connecting part is provided with a driving shaft end fixing groove.

[0011] Further, the outer diameter of each of the wave crest structures gradually decreases from the large-diameter section to the small-diameter section.

[0012] Further, the inner wall of the driving shaft connecting part and the inner wall of the shell connecting part are each provided with at least one protruding structure.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The present application has a reasonable structure design. By arranging the large-diameter end buffer lines on the wave crest surface of the transition section close to the large-diameter section, arranging the small-diameter end buffer lines on the wave crest surface of the transition section close to the small-diameter section, arranging the large-diameter end connecting section between the transition section and the large-diameter section, and arranging the small-diameter end connecting section between the transition section and the small-diameter section, the overall structural strength of the dust cover can be effectively improved, while the dust cover has good tensile and compressive properties, and the flexibility of the dust cover during rotation is not reduced, so that the dust cover has excellent performance, and the structures of the dust cover are not prone to cracking under the application condition of a large swing angle, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application and are incorporated herein for purposes of illustration. The embodiments of the present application, and the specification are exemplary embodiments of the present application and are not intended to limit the present application in any way. In the drawings:

[0016] Fig. 1 FIG. 1 is a structural schematic diagram of the dust cover of the present application;

[0017] Fig. 2 FIG. 2 is a schematic diagram of the dust cover of the present application in a contracted state;

[0018] Fig. 3 FIG. 3 is a three-dimensional structural schematic diagram of the dust cover of the present application;

[0019] Fig. 4 FIG. 4 is a schematic diagram of the dust cover of the present application during installation and application;

[0020] Fig. 5 FIG. 5 is a three-dimensional structural schematic diagram of the dust cover of the present application during installation and application;

[0021] Fig. 6 FIG. 6 is a schematic diagram of the dust cover of the present application when a ring-shaped protrusion is arranged in an embodiment. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0025] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] A high-strength large-angle dust cover suitable for rear drive shaft use, as shown in Figs. 1 to 6 The large-diameter section 1 is connected with the shell 19, and the small-diameter section 2 is connected with the drive shaft 20. The large-diameter section and the small-diameter section are on the same center axis. The small-diameter end is provided with a drive shaft connecting part 3, and the large-diameter end is provided with a shell connecting part 4. There is a transition section 5 between the large-diameter section and the small-diameter section. A plurality of wave crest structures 6 are arranged on the transition section. A wave trough structure 7 is formed between two adjacent wave crest structures. Preferably, the outer diameter of each wave crest structure gradually decreases from the large-diameter section to the small-diameter section. The transition section smoothly transitions from the large-diameter section to the small-diameter section, ensuring the stability of the overall structure of the dust cover.

[0027] Each peak structure comprises a large-diameter end peak surface 8 and a small-diameter end peak surface 9, and a plurality of large-diameter end buffer lines 10 are arranged on the large-diameter end peak surface close to the large-diameter section side, and a large-diameter end drainage groove 11 is formed between adjacent two large-diameter end buffer lines; a plurality of small-diameter end buffer lines 12 are arranged on the small-diameter end peak surface close to the small-diameter section side, and a small-diameter end drainage groove 13 is formed between adjacent two small-diameter end buffer lines. It should be noted that the large-diameter end peak surface refers to the part of the peak structure from the valley structure on the large-diameter side to the peak top, and the small-diameter end peak surface refers to the part of the peak structure from the valley structure on the small-diameter side to the peak top. When the dust cover is in operation, water can be effectively drained between the drainage grooves, thereby avoiding water accumulation.

[0028] The valley structure is an arc-shaped groove. The two side walls of the large-diameter end drainage groove are both inclined surfaces, and the two side walls of the small-diameter end drainage groove are both inclined surfaces, so that the drainage groove is approximately in a V-shaped groove structure, which has a good effect on avoiding noise. The outer surface of the shell connecting portion is provided with a shell end fixing groove. The outer surface of the driving shaft connecting portion is provided with a driving shaft end fixing groove. Preferably, the inner wall of the driving shaft connecting portion and the inner wall of the shell connecting portion are both provided with at least one protruding structure 14. After the driving shaft connecting portion is sleeved on the driving shaft, the protruding structure can be clamped by a throat ring 21, and the protruding structure can effectively form a seal with the driving shaft. After the shell connecting portion is sleeved on the shell, the protruding structure can be clamped by a throat ring, and the protruding structure can effectively form a seal with the shell.

[0029] In the present application, each large-diameter end buffer line and each small-diameter end buffer line not only plays a water guide role, but also plays a structure strength enhancement role. A small-diameter end transition section 15 is arranged between the small-diameter end peak surface close to the small-diameter section side and the small-diameter section, the wall thickness of the small-diameter end transition section gradually decreases from the small-diameter section side to the transition section side, and the length of the small-diameter end transition section is greater than the length of the small-diameter section. A large-diameter end transition section 16 is arranged between the large-diameter end peak surface close to the large-diameter section side and the large-diameter section, the wall thickness of the large-diameter end transition section gradually decreases from the large-diameter section side to the transition section side, and the height of the large-diameter end buffer line on the large-diameter end peak surface protruding from the surface of the large-diameter end peak surface gradually decreases from the large-diameter section side to the transition section side, while the height of the small-diameter end buffer line on the small-diameter end peak surface protruding from the surface of the small-diameter end peak surface is the same.

[0030] The structure design makes the large-diameter end buffer lines combine with the large-diameter section to form a larger included angle between the large-diameter section connecting section and its adjacent large-diameter end peak surface, so as to avoid stress concentration between the two, and further make the large-diameter section and the transition section have higher structural strength, and adapt to large swing working conditions. At the same time, the non-equal-height large-diameter end buffer line design makes the transition section "softer" at the position with smaller height of the large-diameter end buffer line than at the position close to the large-diameter section connecting section, and allows the part far from the large-diameter section connecting section to deform first in large swing applications, and further plays a role in protecting the large-diameter end connecting section. Correspondingly, the equal-height design of the small-diameter end buffer line and the variable-wall thickness structure design of the small-diameter end connecting section make the small-diameter end connecting section allow deformation, and the surface of the small-diameter end connecting section and each small-diameter end buffer line are in contact at the same time, and further make the small-diameter section and the transition section have higher structural strength, and adapt to large swing working conditions.

[0031] In an optional embodiment, a plurality of annular protrusions 17 are arranged on each small-diameter end peak surface without small-diameter section buffer lines, that is, in actual application, when the adjacent two peak surfaces (the large-diameter end peak surface and its adjacent small-diameter end peak surface) are in contact, a plurality of annular protrusions form support between the two peak surfaces, and a transition section drainage groove is formed between adjacent two annular protrusions, which plays a drainage role and further enhances the structural strength of the transition section, while ensuring that the dust cover has good expansion and contraction capability, and also prolongs the service life of the dust cover product. Each annular protrusion is also provided with a communication groove with the same structure as the water guide groove, which communicates adjacent two transition section drainage grooves. The depth of the communication groove is 1 / 3-1 / 2 of the height of the annular protrusion where it is located, and the width of the communication groove is 1 / 50-1 / 30 of the diameter of the annular protrusion where it is located. It will not reduce the flexibility of the dust cover when rotating, and will not damage its balance. Instead of surface contact between the two peak surfaces, the annular protrusion on the small-diameter end peak surface is in contact with the large-diameter end peak surface to form "line" contact. While obtaining the performance of silence, the performance is also guaranteed. The service life of the dust cover with improved structure can also be prolonged to a certain extent.

[0032] In an optional embodiment, each large-diameter end buffer groove and each small-diameter end buffer groove is provided with a water guide groove 18, and the water guide grooves on each large-diameter end buffer groove are staggered, and the water guide grooves on each small-diameter end buffer groove are also staggered. The depth of the water guide groove is 1 / 3-1 / 2 of the height of the buffer groove where the water guide groove is located, and the width of the water guide groove is 1 / 50-1 / 30 of the diameter of the buffer groove where the water guide groove is located. In a further improved scheme, the cross-sectional area (i.e., the product of the depth and the width) of the water guide groove on the buffer groove away from the wave valley structure gradually increases to the water guide groove on the buffer groove close to the wave valley structure, and the cross-sectional area (i.e., the product of the depth and the width) of the communication groove on the annular protrusion away from the wave valley structure gradually increases to the communication groove on the annular protrusion close to the wave valley structure, so that more water accumulates towards the wave valley structure position.

[0033] The above structure design not only ensures that the adjacent two rows of water grooves are connected by the water guide groove and the adjacent two transition section water grooves are connected by the communication groove, but also ensures the structural reinforcement of the buffer groove. The travel path of the accumulated water in each row of water grooves is longer, which is similar to a "labyrinth". At the moment of contraction of the dust cover, the more water accumulates in the corresponding water groove or transition section water groove, the more water is compressed instantaneously to form a "solid structure" in the corresponding groove. That is, the accumulated water in the groove can also assist in reinforcing the transition section. Since more water accumulates in the wave valley structure position, stress concentration and premature damage due to excessive deformation of the wave valley structure can be avoided. Therefore, the disadvantages of accumulated water are converted into advantages, which is more conducive to prolonging the service life of the dust cover.

[0034] The water grooves can well drain water. When there is accumulated water between the contact parts of the two wave peaks, the accumulated water can be smoothly drained to the wave valley structure part (of the drainage space) and the outside of the dust cover along the water grooves. The water grooves arranged in the axial direction of the dust cover and the grooves arranged in the circumferential direction serve as a drainage structure between the contact surfaces. They simultaneously play a role in draining water in the horizontal and vertical directions, which can effectively avoid the noise generated by instantaneous drainage between the two (wave peak) contact surfaces, reduce the vibration of the dust cover, and be conducive to prolonging the service life of the dust cover. Since the water guide grooves on each buffer groove are staggered, the adjacent two water grooves are connected by different position water guide grooves.

[0035] The dust cover has excellent use performance, meanwhile, the occupied space is reduced, the internal volume is reduced, the lubricating grease is saved, under the application working condition of a large swing angle, the cracks of each part structure of the dust cover are not prone to appear, and the service life is prolonged.

[0036] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft, characterized in that: It includes a large-diameter section connected to the housing and a small-diameter section connected to the drive shaft. The large-diameter section and the small-diameter section are on the same central axis. The small-diameter end is provided with a drive shaft connection part, and the large-diameter end is provided with a housing connection part. There is a transition section between the large-diameter section and the small-diameter section. The transition section has several wave crest structures. A wave trough structure is formed between two adjacent wave crest structures. Each wave crest structure includes a large-diameter end wave crest surface and a small-diameter end wave crest surface. Several large-diameter end buffer patterns are provided on the large-diameter end wave crest surface near the large-diameter section. A large-diameter end drainage groove is formed between two adjacent large-diameter end buffer patterns. Several small-diameter end buffer patterns are provided on the small-diameter end wave crest surface near the small-diameter end. A small-diameter end drainage groove is formed between two adjacent small-diameter end buffer patterns. Water guide grooves are provided on each large-diameter end buffer pattern and each small-diameter end buffer pattern. The water guide grooves on the large-diameter end buffer patterns are staggered, and the water guide grooves on the small-diameter end buffer patterns are also staggered. The cross-sectional area of ​​the water guide grooves on the buffer patterns away from the trough structure gradually increases from the buffer patterns on the side closer to the trough structure. On each small-diameter end wave crest surface without small-diameter buffer texture, there are several annular protrusions. Several annular protrusions form support between two wave crest surfaces and form a transition section drainage groove between two adjacent annular protrusions. Each annular protrusion is provided with a connecting groove, which connects two adjacent transition section drainage grooves. The cross-sectional area of ​​the connecting groove on the annular protrusion away from the trough structure gradually increases towards the annular protrusion closer to the trough structure, causing more water to flow towards the trough structure.

2. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: The valley structure is an arc-shaped groove.

3. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: Both sides of the large-diameter end drainage groove are sloped.

4. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: Both sides of the drainage groove at the small diameter end are sloped.

5. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: The outer surface of the housing connection part is provided with a housing end fixing groove.

6. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: The outer surface of the drive shaft connection part is provided with a drive shaft end fixing groove.

7. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: The outer diameter of the wave crest structure in each channel gradually decreases from the large diameter section to the small diameter section.

8. A high-strength dust cover with a large swing angle suitable for use on a rear drive shaft according to claim 1, characterized in that: Both the inner wall of the drive shaft connection and the inner wall of the housing connection are provided with at least one protruding structure.

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