Sealing structure for vehicle air spring

Abstract

The utility model discloses a sealing structure for a vehicle air spring, and belongs to the technical field of vehicle air springs. The problems that in the prior art, a sealing structure of an air spring is poor in sealing effect, and the performance of top rubber can be affected are solved. The fastening assembly is arranged at the top of the upper mounting base assembly, external threads are arranged on the side wall of the top end of the piston rod, a sealing washer and top rubber are arranged in a base hole of the upper mounting base assembly, the top end of the piston rod penetrates through the sealing washer and the top rubber and then is fixed to a nut in a threaded mode, and the top rubber abuts against the top face of the sealing washer. The bottom face of the sealing washer abuts against the inner bottom face of the seat hole of the upper installation seat assembly, and the inner diameter of the sealing washer is smaller than the outer diameter of the piston rod. According to the sealing structure for the vehicle air spring, the top rubber and the piston rod are effectively sealed, the top rubber and the upper installation base assembly are effectively sealed, the pressure difference between the upper surface and the lower surface of the top rubber is kept consistent, the performance of the top rubber is guaranteed, and the performance and stability of the air spring are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle air springs, and in particular relates to a sealing structure for a vehicle air spring. Background Art

[0002] In the automotive industry, air springs, as an important suspension component, have a significant impact on the stability and safety of vehicles. Air springs are formed by filling a closed container with variable volume with high-pressure air, and utilizing the compressibility of the gas to realize the function of an elastic element. During vehicle driving, the piston rod and the air spring will have relative movement, requiring a movable high-pressure sealing structure to be provided at the contact portion between the upper end of the air spring and the piston rod. The traditional structure uses multiple O-rings to seal the top rubber and the upper mounting seat assembly, and the top rubber and the piston rod, but the sealing performance is poor. Multiple O-rings need to be designed for sealing between the top rubber and the piston rod, and the top rubber and the upper mounting seat assembly, which will cause the lower surface of the top rubber to be subjected to the internal air pressure of the air spring, affecting the performance of the top rubber. There is a lack of a sealing structure that can seal between the top rubber and the piston rod, and the top rubber and the upper mounting seat assembly, and prevent the lower surface of the top rubber from being subjected to the internal air pressure of the air spring, which affects the performance of the top rubber. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a sealing structure for a vehicle air spring, which has a good sealing effect, keeps the pressure difference between the upper and lower surfaces of the top glue consistent, and ensures the performance of the top glue.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The utility model discloses a sealing structure for a vehicle air spring, comprising a fastening assembly, an upper mounting seat assembly, a piston rod and a nut, wherein the fastening assembly is arranged at the top of the upper mounting seat assembly, the top end side wall of the piston rod is provided with an external thread matching the nut, a sealing gasket and a top glue are provided in the seat hole of the upper mounting seat assembly, the top end of the piston rod passes through the sealing gasket and the top glue and is threadedly fixed to the nut, the top glue abuts against the top surface of the sealing gasket, the bottom surface of the sealing gasket abuts against the inner bottom surface of the seat hole of the upper mounting seat assembly, and the inner diameter of the sealing gasket is smaller than the outer diameter of the piston rod.

[0006] Furthermore, the sealing gasket includes a fixedly connected colloid and a skeleton, the skeleton is used to support the colloid, the bottom protrusion of the colloid is provided with at least one bottom annular structure, and the inner side of the skeleton is provided with an annular sealing structure, and the inner diameter of the annular sealing structure is smaller than the outer diameter of the piston rod of the shock absorber.

[0007] Furthermore, the skeleton is an annular structural member made of steel, aluminum alloy or PA66.

[0008] Furthermore, the colloid is an annular structural member made of nitrile rubber, natural rubber, chloroprene rubber or propylene rubber.

[0009] Furthermore, the skeleton is fixed on the top of the colloid by vulcanization.

[0010] Furthermore, an annular sealing lip is provided on the inner wall protrusion of the annular sealing structure.

[0011] Furthermore, the number of the annular sealing lip is at least one.

[0012] Furthermore, the bottom edge of the colloid is convexly provided with an edge annular structure, and the convex height of the edge annular structure is smaller than the convex height of the bottom annular structure.

[0013] Furthermore, the top protrusion of the colloid is provided with an annular support structure, and the height of the annular support structure is the same as the vertical distance between the skeleton of the top glue and the bottom surface of the top glue.

[0014] Furthermore, a spring steel wire ring is arranged around the outer side of the annular sealing structure.

[0015] The beneficial effects of the utility model are:

[0016] The present application provides a sealing structure for a vehicle air spring, in which a sealing gasket and a top glue are installed in an upper mounting seat assembly, and the sealing gasket is fixedly installed in the seat hole of the upper mounting seat assembly by the top glue and the piston rod using a nut or a fastening assembly. For example, after the top end of the piston rod of the shock absorber passes through the center hole of the skeleton of the sealing gasket and the top glue, it is fastened to the top glue by tightening the nut with the top end of the piston rod. The fastening assembly is installed on the top of the upper mounting seat assembly, the top glue is in contact with the top surface of the sealing gasket, and the bottom surface of the sealing gasket is in contact with the inner bottom surface of the upper mounting seat assembly. The bottom surface of the sealing gasket is compressed and deformed against the upper mounting seat assembly, and the sealing gasket is sealed with the upper mounting seat assembly, so that the top rubber and the upper mounting seat assembly are sealed; the inner diameter of the sealing gasket is smaller than the outer diameter of the piston rod of the shock absorber, and the piston rod sleeve passes through the sealing gasket, and the sealing gasket and the piston rod are interference fit, and the sealing gasket and the piston rod are sealed, so that the top rubber and the piston rod are sealed; with the cooperation of the sealing gasket and the upper mounting seat assembly and the sealing gasket and the piston rod, the top rubber and the piston rod, and the top rubber and the upper mounting seat assembly are effectively sealed, and the top rubber is in a sealed state and isolated from the internal air pressure of the air spring. The pressure difference between the upper and lower surfaces of the top rubber is kept consistent, so as to avoid the lower surface of the top rubber being subjected to the internal air pressure of the air spring, resulting in a large pressure difference between the upper and lower surfaces of the top rubber, affecting the performance of the top rubber, thereby ensuring the performance of the top rubber, and then ensuring the performance and stability of the air spring, and improving the comfort of riding in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a cross-sectional view of a sealing structure for a vehicle air spring provided by an embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional view of a sealing gasket without an annular support structure provided by an embodiment of the present utility model;

[0020] Figure 3 It is a cross-sectional view of a sealing gasket with an annular support structure provided in an embodiment of the present utility model.

[0021] Figure numerals: upper mounting seat assembly 1, top glue 2, piston rod 3, nut 4, fastening assembly 5, sealing gasket 6, glue 61, skeleton 62, annular support structure 63, edge annular structure 64, bottom annular structure 65, spring steel wire ring 66, annular sealing structure 67, annular sealing lip 671. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 、 Figure 2 、 Figure 3As shown, this embodiment provides a sealing structure for a vehicle air spring, including a fastening assembly 5, an upper mounting seat assembly 1, a piston rod 3 and a nut 4. The fastening assembly 5 is arranged at the top of the upper mounting seat assembly 1. The top side wall of the piston rod 3 is provided with an external thread that cooperates with the nut 4. A sealing gasket 6 and a top glue 2 are provided in the seat hole of the upper mounting seat assembly 1. The top end of the piston rod 3 passes through the sealing gasket 6 and the top glue 2 and is threadedly fixed to the nut 4. The top glue 2 abuts against the top surface of the sealing gasket 6, and the bottom surface of the sealing gasket 6 abuts against the inner bottom surface of the seat hole of the upper mounting seat assembly 1. The inner diameter of the sealing gasket 6 is smaller than the outer diameter of the piston rod 3. The fastening assembly 5 is a cap and retaining ring structure or a cap ring-shaped internal thread structure of the upper mounting seat assembly 1 or a cap and a bolt connected to the upper mounting seat assembly 1.

[0025] A sealing structure for a vehicle air spring based on the above structure, wherein the sealing gasket 6 and the top glue 2 are installed in the upper mounting seat assembly 1, and the sealing gasket 6 is fixedly installed in the seat hole of the upper mounting seat assembly 1 by the top glue 2 and the piston rod 3 using a nut 4 or a fastening assembly 5. After the top end of the piston rod 3 of the shock absorber passes through the center hole of the skeleton of the sealing gasket 6 and the top glue 2, the nut 4 is tightened with the top end of the piston rod 3 to fasten it to the top glue 2, and the fastening assembly 5 is installed on the top of the upper mounting seat assembly 1, and the top glue 2 is in contact with the top surface of the sealing gasket 6, and the bottom surface of the sealing gasket 6 is in contact with the inner bottom surface of the upper mounting seat assembly 1. When the cam 6 is in the air, the piston rod 3 is pressed against the piston 3, and the piston rod 3 is pressed against the piston rod 3, thereby the cam 6 and the piston rod 3 are in the air. The outer wall of the sealing gasket 6 has a clearance fit or fits against the inner wall of the upper mounting seat assembly 1. The fastening assembly 5 is positioned atop the upper mounting seat assembly 1, securing the top rubber 2 and the sealing gasket 6 within the seat hole of the upper mounting seat assembly 1. With the cooperation of the fastening assembly 5 and the sealing gasket 6, the top rubber 2 is completely sealed. The sealing gasket 6 supports and withstands the pressure transmitted by the rubber in the top rubber 2. Furthermore, under the action of the internal air pressure of the air spring, the sealing gasket 6 and the piston rod 3 fit more tightly. The higher the internal air pressure, the tighter the fit between the sealing gasket 6 and the piston rod 3, resulting in a better sealing effect.

[0026] As an implementable method, Figure 1 、 Figure 2 、 Figure 3As shown, the sealing gasket 6 comprises a fixedly connected colloid 61 and a frame 62. The frame 62 supports the colloid 61. The bottom of the colloid 61 is provided with at least one bottom annular structure 65. An annular sealing structure 67 is located inside the frame 62. The inner diameter of the annular sealing structure 67 is smaller than the outer diameter of the shock absorber's piston rod 3. The colloid 61 and the frame 62 are annular in shape. The frame 62 is fixed to the top or inside of the colloid 61. The colloid 61 and the frame 62 can be chemically bonded using an adhesive or glue, heat-vulcanized, or mechanically secured using screws and nuts. The height of the raised bottom annular structure 65 is determined by the preload of the colloid 61.

[0027] The above-mentioned sealing gasket 6 is composed of a colloid 61 and a skeleton 62 supporting the colloid. A bottom annular structure 65 is protruded from the bottom of the colloid 61, and an annular sealing structure 67 with an inner diameter smaller than the outer diameter of the piston rod 3 of the shock absorber is provided on the inner side of the skeleton 62. The sealing gasket 6 is assembled with the upper mounting seat assembly 1, the top glue 2 and the piston rod 3. The sealing gasket 6 and the top glue 2 are installed in the upper mounting seat assembly 1. The sealing gasket 6 is fixedly installed in the seat hole of the upper mounting seat assembly 1 by the top glue 2 and the piston rod 3 using a nut 4 or a fastening assembly 5. After the top end of the piston rod 3 of the shock absorber passes through the annular sealing structure 67 of the sealing gasket 6 and the center hole of the skeleton of the top glue 2, it is fastened to the top glue 2 by tightening the nut 4 with the top end of the piston rod 3. The top glue 2 is in contact with the top surface of the sealing gasket 6, and the bottom surface of the sealing gasket 6 is in contact with the inner bottom surface of the upper mounting seat assembly 1. Among them, the bottom annular structure 65 is compressed and deformed against the upper mounting seat assembly 1, and the bottom annular structure 65 is sealed with the upper mounting seat assembly 1, so that the sealing gasket 6 is sealed with the upper mounting seat assembly 1, and then the top glue 2 is sealed with the upper mounting seat assembly 1; the inner diameter of the annular sealing structure 67 is smaller than the outer diameter of the piston rod 3 of the shock absorber, and the piston rod 3 is sleeved through the annular sealing structure 67, the annular sealing structure 67 is sealed with the piston rod 3, the sealing gasket 6 is sealed with the piston rod 3, and then the top glue 2 is sealed with the piston rod 3. With the cooperation of the bottom annular structure 65 and the annular sealing structure 67, the top glue 2 and the piston rod 3, the top glue 2 and the upper mounting seat assembly 1 are effectively sealed, and the top glue 2 is in a sealed state and isolated from the internal air pressure of the air spring. The pressure difference between the upper and lower surfaces of the top glue 2 is kept consistent, so as to avoid the lower surface of the top glue 2 being subjected to the internal air pressure of the air spring, causing the pressure difference between the upper and lower surfaces of the top glue 2 to be large, affecting the performance of the top glue 2, thereby ensuring the performance of the top glue 2, and then ensuring the performance and stability of the air spring, thereby improving the comfort of riding in the car. In summary, the aforementioned sealing gasket 6 only requires a single sealing gasket 6 to effectively seal between the top rubber 2 and the piston rod 3, and between the top rubber 2 and the upper mounting assembly 1. This provides excellent sealing performance, requires fewer sealing components, and is low cost. The pressure differential between the top and bottom surfaces of the top rubber 2 remains consistent, ensuring the performance of the top rubber 2. Under the action of the internal pressure of the air spring, the annular sealing structure 67 of the sealing gasket 6 and the shock absorber's piston rod 3 undergo axial relative movement, forming a dynamic seal with the piston rod 3. The amplitude of this relative movement is affected by the shape of the sealing gasket 6's skeleton 62, the properties of the colloid 61, and the internal pressure of the air spring. The outer wall of the sealing gasket 6 forms a clearance fit or fit with the inner wall of the upper mounting assembly 1. The fastening assembly 5 is positioned atop the upper mounting assembly 8, securing the top rubber 9 and the sealing gasket within the seat bore of the upper mounting assembly 8. The fastening assembly 5, the bottom annular structure 65, and the annular sealing structure 67 ensure that the top rubber 2 is completely sealed.The bottom annular structure 65 corresponds to the position of the top rubber 2. A first groove is provided on the frame 62, opposite to the top rubber 2. The top rubber 2 is installed in the first groove. The inner bottom surface of the upper mounting seat assembly 1 is provided with a second groove, opposite to the bottom annular structure 65. The bottom annular structure 65 is installed in the second groove. The support frame 62 withstands the pressure transmitted by the top rubber 2, improving stability. Under the action of the internal air pressure of the air spring, the annular sealing structure 67 and the piston rod 3 are more tightly fitted. The greater the internal air pressure, the tighter the fit between the annular sealing structure 67 and the piston rod 3, and the better the sealing effect.

[0028] The skeleton 62 is an annular structural member made of steel, aluminum alloy or PA66.

[0029] The skeleton 62 structure made of steel, aluminum alloy, PA66 or other materials has the characteristics of height and high strength, and is used as a supporting and filling structure to better support and fill the colloid 61.

[0030] As an implementation method, the colloid 61 is an annular structural member made of nitrile rubber, natural rubber, chloroprene rubber or propylene rubber.

[0031] The colloid 61 structural parts made of materials such as nitrile rubber, natural rubber, chloroprene rubber or propylene rubber have the characteristics of excellent elasticity, high temperature resistance, low temperature resistance and corrosion resistance, and are better used as colloid 61 and then as sealing gaskets for vehicle air springs.

[0032] As an implementable method, Figure 1 、 Figure 2 、 Figure 3 As shown, the skeleton 62 is fixed on the top of the colloid 61 by vulcanization.

[0033] The skeleton 62 is fixed on the top of the colloid 61, so that the skeleton 62 and the colloid 61 can be bonded and fixed by using heating and vulcanization, which is a simple manufacturing operation.

[0034] As an implementable method, Figure 1 、 Figure 2 、 Figure 3 As shown, the inner wall of the annular sealing structure 67 is provided with an annular sealing lip 671 or a sealing ring.

[0035] The annular sealing lip 671 is used to enhance the sealing between the annular sealing structure 67 and the piston rod 3 of the shock absorber, thereby enhancing the sealing between the top rubber 2 and the piston rod 3 of the shock absorber.

[0036] There is at least one annular sealing lip 671 .

[0037] The number of annular sealing lips 671 is one or more, such as one or two or more integers, and multiple annular sealing lips 671 are arranged in parallel and spaced apart on the inner wall of the annular sealing structure 67, further enhancing the sealing between the annular sealing structure 67 and the piston rod 3 of the shock absorber, and then enhancing the sealing between the top glue 2 and the piston rod 3 of the shock absorber.

[0038] As an implementable method, Figure 1 、 Figure 2 、 Figure 3 As shown, the bottom edge of the colloid 61 is protruded with an edge annular structure 64 , and the protruding height of the edge annular structure 64 is smaller than the protruding height of the bottom annular structure 65 .

[0039] The sealing gasket 6 is installed in the upper mounting seat assembly 1, and the edge annular structure 64 contacts the inner bottom surface of the upper mounting seat assembly 1 and is compressed and deformed, further enhancing the sealing and support of the top glue 2 and the upper mounting seat assembly 1. The height of the protrusion of the edge annular structure 64 is set by the pre-compression amount of the colloid 61. The outer edge of the skeleton 62 is bent downward to form a skeleton bending portion, and the outer edge of the colloid 61 is bent downward to form a colloid bending portion that cooperates with the skeleton bending portion. The skeleton bending portion is covered on the colloid bending portion, and the edge annular structure 64 is set on the colloid bending portion. The edge annular structure 64 protrudes from the skeleton bending portion. The skeleton bending portion is tilted and chamfered away from the colloid bending portion, and the edge annular structure 64 is set on the inclined surface of the colloid bending portion.

[0040] As an implementable method, Figure 1 、 Figure 3 As shown, the top protrusion of the glue 61 is provided with an annular support structure 63 , and the height of the annular support structure 63 is the same as the vertical distance between the skeleton of the top glue 2 and the bottom surface of the top glue 2 .

[0041] After the sealing gasket is assembled with the upper mounting assembly 1, the top rubber 2, and the piston rod 3, the top of the annular support structure 63 fits or contacts the framework of the top rubber 2, supporting the annular sealing structure 67 and preventing axial relative movement between the annular sealing structure 67 of the sealing gasket and the piston rod 3 of the shock absorber under the action of the internal pressure of the air spring. The annular sealing structure 67 of the sealing gasket 6 forms a static seal with the piston rod 3 of the shock absorber, further enhancing the sealing performance and stability of the sealing gasket 6. The annular support structure 63 and the rubber 61 can be integrally molded. The inner diameter of the annular support structure 63 is slightly larger than the outer diameter of the shock absorber's piston rod 3. The shock absorber's piston rod 3 is sleeved within the annular support structure 63, and the shock absorber's piston rod 3 and the annular support structure 63 have a clearance fit. A support framework is provided within the cylindrical annular support structure 63 to enhance the strength, rigidity, and stability of the annular support structure 63.

[0042] As an implementable method, Figure 1 、 Figure 2 、 Figure 3 As shown, a spring steel wire ring 66 is arranged around the outer side of the annular sealing structure 67 .

[0043] An annular mounting groove is circumferentially provided on the outer side wall of the annular sealing structure 67 , and the spring wire ring 66 is sleeved in the annular mounting groove, applying radial inward pre-pressure to the annular sealing structure 67 to improve the stability of the annular sealing structure 67 .

[0044] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing structure for a vehicle air spring, characterized in that: It comprises a fastening assembly (5), an upper mounting seat assembly (1), a piston rod (3) and a nut (4), wherein the fastening assembly (5) is arranged at the top of the upper mounting seat assembly (1), the top side wall of the piston rod (3) is provided with an external thread matching the nut (4), a sealing gasket (6) and a top glue (2) are provided in the seat hole of the upper mounting seat assembly (1), the top end of the piston rod (3) passes through the sealing gasket (6) and the top glue (2) and is threadedly fixed to the nut (4), the top glue (2) is against the top surface of the sealing gasket (6), the bottom surface of the sealing gasket (6) is against the inner bottom surface of the seat hole of the upper mounting seat assembly (1), and the inner diameter of the sealing gasket (6) is smaller than the outer diameter of the piston rod (3).

2. The sealing structure for a vehicle air spring according to claim 1, characterized in that: The sealing gasket (6) comprises a fixedly connected colloid (61) and a skeleton (62), wherein the skeleton (62) is used to support the colloid (61), the bottom protrusion of the colloid (61) is provided with at least one bottom annular structure (65), and the inner side of the skeleton (62) is provided with an annular sealing structure (67), and the inner diameter of the annular sealing structure (67) is smaller than the outer diameter of the piston rod (3) of the shock absorber.

3. The sealing structure for a vehicle air spring according to claim 2, characterized in that: The skeleton (62) is an annular structural member made of steel, aluminum alloy or PA66.

4. The sealing structure for a vehicle air spring according to claim 3, characterized in that: The colloid (61) is an annular structural member made of nitrile rubber, natural rubber, chloroprene rubber or propylene rubber.

5. The sealing structure for a vehicle air spring according to claim 4, characterized in that: The skeleton (62) is fixed on the top of the colloid (61) by vulcanization.

6. The sealing structure for a vehicle air spring according to claim 2, characterized in that: An annular sealing lip (671) is provided on the inner wall of the annular sealing structure (67).

7. The sealing structure for a vehicle air spring according to claim 6, characterized in that: The number of the annular sealing lip (671) is at least one.

8. The sealing structure for a vehicle air spring according to claim 2, characterized in that: The bottom edge of the colloid (61) is convexly provided with an edge annular structure (64), and the convex height of the edge annular structure (64) is smaller than the convex height of the bottom annular structure (65).

9. A sealing structure for a vehicle air spring according to any one of claims 2 to 8, characterized in that: The top protrusion of the colloid (61) is provided with an annular support structure (63), and the height of the annular support structure (63) is the same as the vertical distance between the skeleton of the top glue (2) and the bottom surface of the top glue (2).

10. The sealing structure for a vehicle air spring according to claim 9, characterized in that: A spring steel wire ring (66) is arranged around the outer side of the annular sealing structure (67).

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