Dustproof cover structure of large-swing-angle driving shaft and automobile

Abstract

The invention relates to the technical field of driving shaft dust covers, and discloses a large-swing-angle driving shaft dust cover structure and an automobile, the large-swing-angle driving shaft dust cover structure comprises a dust cover body, the dust cover body is provided with a first wave crest and a second wave crest, and the outer diameter of the first wave crest is larger than that of the second wave crest; the first wave crest height in the axial direction of the dust cover body is larger than the second wave crest height. The dustproof cover body is small in occupied size and compact in structure, does not limit and influence structural arrangement and space utilization of a chassis, reduces the amount of grease in an outer ball cage joint of a driving shaft, and has a larger swing angle range due to the arrangement of a double-wave-crest structure; the first wave crest and the second wave crest are arranged in a staggered mode, the first wave crest is higher than the second wave crest, the second wave crest can serve as a reinforcing rib structure between the first wave crest and the shaft rod connecting part, the supporting strength of the dust cover when a swing angle occurs is improved, and extrusion stress deformation between the wave crests under the condition that the swing angle is larger than 30 degrees can be eliminated. The problems that an existing dust cover is prone to wrinkling and abnormal sound due to extrusion are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive shaft dust covers, and particularly to a large swing angle drive shaft dust cover structure and an automobile. Background Art

[0002] With the rapid development of new energy vehicles, the market has an increasing demand for new automotive functions. In order to facilitate parking and reduce the turning radius of the vehicle, the function of rear-wheel steering of the vehicle has been developed. The rear-wheel steering function of the vehicle requires that the outer constant velocity joint of the drive shaft has a certain swing angle, and the swing angle should be greater than 30 degrees. Currently, the traditional rear drive shaft uses a single-wave dust cover, which can reduce the internal space of the outer constant velocity joint of the drive shaft to reduce the amount of grease in the constant velocity joint to achieve cost reduction. However, due to structural limitations, this single-wave dust cover can only achieve a maximum swing angle of 22 degrees for the constant velocity joint. When the swing angle is larger, the dust cover is easily squeezed and wrinkled, making abnormal noises and unable to meet the durability use requirements, affecting the long-term use of the dust cover. Therefore, although the single-wave structure dust cover has a smaller volume and requires less grease, the single-wave dust cover cannot meet the large swing angle requirements of rear-wheel steering.

[0003] The existing multi-wave dust covers can meet the swing angle of the drive shaft greater than 30 degrees, but the dust covers occupy a large space, which brings limitations and impacts on the chassis structure layout and space utilization; and a large amount of grease needs to be injected into the constant velocity joint, resulting in too high costs. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a large swing angle drive shaft dust cover structure and an automobile. The dust cover body has a small occupied volume, a compact structure, does not bring limitations and impacts on the chassis structure layout and space utilization, reduces the amount of grease in the outer constant velocity joint of the drive shaft, and the double-wave structure setting has a larger swing angle range and has good anti-extrusion performance.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, a large swing angle drive shaft dust cover structure includes a dust cover body. The dust cover body is provided with a first wave peak and a second wave peak. The outer diameter of the first wave peak is greater than the outer diameter of the second wave peak, and the height of the first wave peak in the axial direction of the dust cover body is greater than the height of the second wave peak, which can increase the swing angle range of the dust cover body, and the overall volume is small. The dust cover body has good anti-extrusion performance.

[0007] As a further implementation manner, the dust cover body has a large diameter end and a small diameter end, and is sequentially provided with a first wave peak, a first wave valley, a second wave peak, a second wave valley, and a shaft rod connection part from the large diameter end to the small diameter end.

[0008] As a further implementation, a first clamping portion is provided at the large-diameter end position, and the first clamping portion is used to cooperate with the first clamp.

[0009] As a further implementation, the small-diameter end is provided at the end position of the shaft rod connecting portion, and a second clamping portion is provided at the small-diameter end for cooperating with the second clamp.

[0010] As a further implementation, the first wave crest, the first wave trough, the second wave crest, and the second wave trough are all annular planar structures parallel to each other and are arranged perpendicular to the axis of the dust cover body.

[0011] As a further implementation, the height of the first wave trough is less than the height of the second wave trough.

[0012] As a further implementation, the first wave crest is connected to the large-diameter end through a first outer transition portion and connected to the first wave trough through a first inner transition portion; the second wave crest is connected to the first wave trough through a second outer transition portion and connected to the second wave trough through a second inner transition portion, and the inner side edge of the second wave trough is connected to the shaft rod connecting portion.

[0013] As a further implementation, the cross-section of each of the transition portions is inclined with respect to the axis of the dust cover body.

[0014] As a further implementation, the cross-sectional width of the first wave crest is not less than the cross-sectional width of the second wave crest.

[0015] In a second aspect, an automobile has a rear-wheel steering function and is equipped with the large swing angle drive shaft dust cover structure as described in any one of the above at the outer ball joint of the drive shaft.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The dust cover body of the present invention occupies a small volume and has a compact structure, which will not bring restrictions and impacts on the chassis structure layout and space utilization, reduces the amount of grease in the outer ball joint of the drive shaft, and the double wave crest structure has a larger swing angle range; the first wave crest and the second wave crest are staggered, the first wave crest is higher than the second wave crest, and the second wave crest can be used as a reinforcing rib structure between the first wave crest and the shaft rod connecting portion, improving the support strength of the dust cover when the swing angle occurs, and can eliminate the extrusion stress deformation between the wave crests in the case of a large swing angle greater than 30°, solving the problem that the existing dust cover is prone to wrinkles and abnormal noises due to extrusion.

[0018] 2. The cross-sections of the respective transition portions of the present invention are inclined, such that the distance between the first wave crest and the second wave crest and the distance between the second wave crest and the top of the shaft rod connecting portion are greater than the distance between the bottoms. When a swing angle occurs, it can ensure that the dust cover body has a sufficient swing range, and there will be no contact or collision between the wave crests and between the second wave crest and the shaft rod connecting portion, which can meet the durability use requirements in the case of large swing angles of the rear wheel steering.

[0019] 3. The second wave crest of the present invention does not protrude beyond the first wave crest, such that the axial length of the entire dust cover body is relatively small. Compared with the dust cover body with a single wave crest structure, on the one hand, it increases its effective swing angle range without increasing the axial dimension of the dust cover body, and on the other hand, it can ensure sufficient support strength, which can meet the durability use requirements in the case of large swing angles of the rear wheel steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0021] Figure 1 is a schematic view of the overall structure of the dust cover body in an embodiment of the present invention;

[0022] Figure 2 is a front view structural schematic diagram after the dust cover body is installed in an embodiment of the present invention;

[0023] Figure 3 is an axonometric structural schematic diagram after the dust cover body is installed in an embodiment of the present invention;

[0024] Figure 4 is a partial cross-sectional schematic diagram of the dust cover body in an embodiment of the present invention.

[0025] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0026] Wherein: 1. Dust cover body, 2. Outer ball joint housing of the drive shaft, 3. First clamp, 4. Second clamp; 13. First clamping portion, 111. First outer transition portion, 11. First wave crest, 112. First inner transition portion; 6. First wave valley, 121. Second outer transition portion, 12. Second wave crest, 122. Second inner transition portion, 7. Second wave valley; 5. Shaft rod connecting portion, 14. Second clamping portion, 15. Flange structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0028] As mentioned in the background art, the currently traditional rear drive shaft uses a single-peak dust cover, which can reduce the internal space of the outer constant velocity joint of the drive shaft to reduce the amount of grease in the constant velocity joint and achieve cost reduction. However, due to structural limitations, this single-peak dust cover can only achieve a maximum constant velocity joint swing angle of 22 degrees. When the swing angle is larger, the dust cover is easily squeezed and wrinkled, making abnormal noises and unable to meet the durable use requirements, affecting the long-term use of the dust cover. Therefore, the single-peak dust cover for rear-wheel steering cannot meet the large swing angle requirements. Although the existing multi-peak dust covers can meet a drive shaft swing angle greater than 30 degrees, the overall space occupied by the dust cover is relatively large, which brings limitations and impacts on the chassis structure layout and space utilization; and the amount of grease that needs to be injected into the constant velocity joint is large, resulting in too high costs.

[0029] When the rear wheels of an automobile are steered, generally, the dust cover is required to be able to meet a constant velocity joint swing angle greater than 30°. Therefore, it is necessary to improve the existing dust cover structure so that on the one hand, it has a smaller volume, does not affect the layout of other structural spaces, and reduces the cost of the required grease; on the other hand, it needs to be able to meet a constant velocity joint swing angle greater than 30°, and the overall structure of the dust cover has good anti-extrusion performance. In order to meet the large swing angle requirements of the outer constant velocity joint dust cover of the drive shaft for rear-wheel steering of an automobile, the structure of the dust cover body is improved through the following embodiments so that it can meet the above requirements.

[0030] Embodiment 1

[0031] In a typical implementation manner of the present invention, with reference to Figures 1 - 4 as shown, a large swing angle drive shaft dust cover structure includes a dust cover body 1. The dust cover body 1 has a large diameter end and a small diameter end, and is fixedly installed on the outer constant velocity joint housing 2 of the drive shaft through a clamp.

[0032] As Figure 1 shown, the dust cover body 1 is a double-peak structure, including a first peak 11 and a second peak 12. The outer diameter of the first peak 11 is greater than the outer diameter of the second peak 12, so that the second peak 12 is arranged inside the first peak 11.

[0033] A first clamping portion 13 is provided at the large diameter end position of the dust cover body. The first clamping portion 13 is used to cooperate with a first clamp. The first clamp 3 locks the first clamping portion 13 on the outer constant velocity joint housing 2 of the drive shaft. The small diameter end is arranged at the end position of the shaft rod connecting portion 5. A second clamping portion 14 is provided at the small diameter end for cooperating with a second clamp. The second clamp 4 locks the second clamping portion 14 on the drive shaft rod, as Figure 2 and Figure 3 shown.

[0034] At the upper and lower ends of the first clamping portion 13 and the second clamping portion 14, annular edge structures 15 are provided to limit the position of the clamp and prevent relative displacement between the clamp and the clamping portion.

[0035] The structure from the large-diameter end to the small-diameter end of the dust cover body 1 is successively the first wave crest 11, the first wave trough 6, the second wave crest 12, the second wave trough 7, and the shaft connecting portion 5.

[0036] As Figure 1 and Figure 4 shown, the structures of the first wave crest 11, the first wave trough 6, the second wave crest 12, and the second wave trough 7 are all annular planar structures and are parallel to each other, greatly reducing the extrusion stress during the deformation of the dust cover. The outer diameters of the first wave crest 11, the first wave trough 6, the second wave crest 12, and the second wave trough 7 decrease successively. The planes where the first wave crest 11, the first wave trough 6, the second wave crest 12, and the second wave trough 7 are located are perpendicular to the axis of the dust cover body 1.

[0037] The outer side and the inner side of the wave crest are both connected to the corresponding transition portion, making the entire dust cover a continuously extending structure.

[0038] As Figure 1 and Figure 4 shown, the outer side of the first wave crest 11 is connected to the top position of the first clamping portion 13 at the large-diameter end through the first outer transition portion 111. The top position is described based on the orientation perspective where the axis of the dust cover body 1 is perpendicular to the horizontal plane, with the large-diameter end at the bottom and the small-diameter end at the top.

[0039] The inner side of the first outer transition portion 111 is connected to the outer side of the first wave trough 6 through the first inner transition portion 112; the outer side of the second wave crest 12 is connected to the inner side of the first wave trough 6 through the second outer transition portion 121, the inner side of the second wave crest 12 is connected to the outer side of the second wave trough 7 through the second inner transition portion 122, and the inner side of the second wave trough 7 is connected to the bottom position of the shaft connecting portion 5. The top position of the shaft connecting portion 5 is set as the second clamping portion 13.

[0040] Therefore, the structure extending successively from the bottom to the top of the dust cover body 1 is the first clamping portion 13, the first outer transition portion 111, the first wave crest 11, the first inner transition portion 112, the first wave trough 6, the second outer transition portion 121, the second wave crest 12, the second inner transition portion 122, the second wave trough 7, the shaft connecting portion 5, and the second clamping portion 14, and each structure is connected successively.

[0041] Since the outer diameters of the first wave crest 11, the first wave trough 6, the second wave crest 12, and the second wave trough 7 decrease successively, the cross-section of the transition portion is inclined with respect to the axis of the dust cover body 1. Each transition portion structure is a frustum of a cone with upper and lower openings, and the lower opening of the inner transition portion is small and the upper opening is large, while the upper opening of the outer transition portion is small and the lower opening is large. AsFigure 4 as shown

[0042] As Figure 1 and Figure 4 shown, according to the Figure 4 viewpoint, with the large-diameter end at the bottom and the small-diameter end at the top, the height of the first wave crest 11 in the axial direction of the dust cover body is greater than the height of the second wave crest 12, so that the first wave crest 11 and the second wave crest 12 of this embodiment are in a structure with staggered heights.

[0043] The cross-section of the transition part is inclined, so that the distance between the first wave crest 11 and the second wave crest 12 and the distance between the top of the second wave crest 12 and the top of the shaft rod connecting part 5 are greater than the bottom distance. When the swing angle occurs, it can ensure that the dust cover body 1 has enough swing range, and there will be no contact or collision between the wave crests and between the second wave crest 12 and the shaft rod connecting part 5, so that the dust cover body of this embodiment has enough swing angle range and can meet the large swing angle requirement during the rear wheel steering.

[0044] A second wave crest 12 is added between the first wave crest 11 and the shaft rod connecting part 5, and the two wave crests are staggered in height, and the second wave crest is designed to be short and flat. The second wave crest can be used as a reinforcing rib structure between the first wave crest and the shaft rod connecting part 5, playing a good supporting role, improving the supporting strength of the dust cover when the swing angle occurs, and can eliminate the extrusion stress deformation between the wave crests in the case of a large swing angle greater than 30°, solving the problem that the existing dust cover is prone to wrinkles and abnormal noises due to extrusion, so as to meet the durable use performance of the dust cover.

[0045] Furthermore, since the height of the first wave crest 11 is greater than the height of the second wave crest 12, the second wave crest 12 is retracted inside the extension range of the first wave crest 11. Since the second wave crest 12 does not protrude from the first wave crest 11, the axial length of the entire dust cover body 1 is smaller. Compared with the dust cover body with a single wave crest structure, on the one hand, its effective swing angle range is increased, and on the other hand, sufficient supporting strength can be ensured, and the durable use requirement in the case of a large swing angle of the rear wheel steering can be met.

[0046] The dust cover body 1 of this embodiment occupies a small volume, has a compact structure, will not bring restrictions and impacts on the chassis structure layout and space utilization, reduces the amount of grease inside the outer ball cage joint of the drive shaft, and reduces the raw material cost of the drive shaft.

[0047] It can be understood that the purpose of this embodiment is to provide a new design scheme for a large swing angle drive shaft dust cover that meets the requirements of automotive rear wheel steering, and there are no rigid requirements for the material and wall thickness of the dust cover.

[0048] Further, the height of the relatively outer first wave valley 6 is less than the height of the inner second wave valley 7. This structural design increases the straight-line distance from the second wave valley 7 to the first wave valley 6, so that when the swing angle occurs, there will be no mutual contact between the two sets of wave valleys and wave peaks, thus avoiding the problems of frictional abnormal noise and durability failure caused by contact friction.

[0049] The cross-sectional width of the first wave peak is not less than the cross-sectional width of the second wave peak. In an optional example, the cross-sectional width of the first wave peak is equal to the cross-sectional width of the second wave peak.

[0050] Embodiment 2

[0051] In a typical embodiment of the present invention, refer to Figures 1 - 4 As shown, a vehicle is provided with a rear-wheel steering function, and the large swing angle drive shaft dust cover structure described in Embodiment 1 is installed at the outer constant velocity joint housing 2 of the drive shaft. By adopting the dust cover body 1 structure, the extrusion stress deformation between the wave peaks in the case of a large swing angle greater than 30° can be eliminated, so as to meet the durable use performance of the dust cover.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large swing angle drive shaft dust cover structure, characterized in that: The dust cover body comprises a first wave crest and a second wave crest. The outer diameter of the first wave crest is larger than the outer diameter of the second wave crest. The height of the first wave crest along the axial direction of the dust cover body is larger than the height of the second wave crest.

2. A large swing angle drive shaft dust cover structure according to claim 1, characterized in that: The dust cover body has a large diameter end and a small diameter end, and a first wave crest, a first wave trough, a second wave crest, a second wave trough and a shaft connecting part are sequentially arranged from the large diameter end to the small diameter end.

3. The large swing angle drive shaft dust cover structure according to claim 2, characterized in that: A first clamping portion is provided at the large diameter end, and the first clamping portion is used to cooperate with the first clamp.

4. The large swing angle drive shaft dust cover structure according to claim 2, characterized in that: The small diameter end is arranged at the end position of the shaft rod connecting part, and the small diameter end is arranged as a second clamping part for cooperating with the second clamp.

5. The large swing angle drive shaft dust cover structure according to claim 2, characterized in that: The first wave crest, the first wave trough, the second wave crest, and the second wave trough are all annular planar structures parallel to each other and are arranged perpendicular to the axis of the dust cover body.

6. A large swing angle drive shaft dust cover structure according to claim 5, characterized in that: A height of the first corrugation valley is smaller than a height of the second corrugation valley.

7. The large swing angle drive shaft dust cover structure according to claim 6, characterized in that: The first wave peak is connected to the large diameter end through the first outer transition portion and to the first wave valley through the first inner transition portion; the second wave peak is connected to the first wave valley through the second outer transition portion and to the second wave valley through the second inner transition portion, and the inner side of the second wave valley is connected to the shaft connecting portion.

8. The large swing angle drive shaft dust cover structure according to claim 7, characterized in that: The cross section of each transition portion is arranged to be inclined relative to the axis of the dust cover body.

9. The large swing angle drive shaft dust cover structure according to claim 1, characterized in that: The cross-sectional width of the first wave peak is not less than the cross-sectional width of the second wave peak.

10. An automobile, characterized in that: The automobile has a rear wheel steering function, and a large swing angle drive shaft dust cover structure as claimed in any one of claims 1 to 9 is installed on the outer ball cage of the drive shaft.

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