Sealing structure for vehicle air spring

Abstract

The invention 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 as well as the top rubber and the upper mounting seat assembly are effectively sealed, so that 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 the stability of the air spring are guaranteed.

Description

Technical Field

[0001] The present invention 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 are an important suspension component that has a significant impact on the stability and safety of vehicles. Air springs are filled with high-pressure air in a closed container with a variable volume, and use the compressibility of the gas to realize the function of an elastic element. During the driving process of the vehicle, the piston rod and the air spring will have relative movement, and it is necessary to provide a movable high-pressure sealing structure at the contact part 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, and 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 bear the internal air pressure of the air spring, affecting the performance of the top rubber, and lacking 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 bearing the internal air pressure of the air spring and affecting the performance of the top rubber. Summary of the invention

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

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention 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 on 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 arranged 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 colloid and a skeleton that are fixedly connected, 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 structure 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 protrusion of the colloid is provided with an edge ring structure, and the protrusion height of the edge ring structure is smaller than the protrusion height of the bottom ring 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 present invention 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 a seat hole of the upper mounting seat assembly by the top glue and the piston rod using a nut or a fastening assembly. After the top end of the piston rod of the shock absorber passes through the central hole of the skeleton of the sealing gasket and the top glue, the top end of the piston rod is fastened to the top glue by tightening a nut, and 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, 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, thereby 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

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

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

[0021] Figure numerals: upper mounting seat assembly 1, top rubber 2, piston rod 3, nut 4, fastening assembly 5, sealing gasket 6, colloid 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention is further described below in conjunction with 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, wherein the fastening assembly 5 is arranged at the top of the upper mounting seat assembly 1, and the top side wall of the piston rod 3 is provided with an external thread matched with the nut 4, and a sealing gasket 6 and a top rubber 2 are arranged in the seat hole of the upper mounting seat assembly 1, and the top of the piston rod 3 passes through the sealing gasket 6 and the top rubber 2 and is threadedly fixed with the nut 4, and the top rubber 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, and 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 a retaining ring structure or a cap ring is connected to the upper mounting seat assembly 1 with an internal thread structure of the external thread or a cap and a bolt.

[0025] A sealing structure for a vehicle air spring based on the above structure, wherein a sealing gasket 6 and a top rubber 2 are installed in an upper mounting seat assembly 1, and the sealing gasket 6 is fixedly installed in a seat hole of the upper mounting seat assembly 1 by the top rubber 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 rubber 2, the nut 4 is tightened with the top end of the piston rod 3 to fasten the top rubber 2, and the fastening assembly 5 is installed on the top of the upper mounting seat assembly 1, the top rubber 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. The bottom surface of the sealing gasket 6 is compressed and deformed against the upper mounting seat assembly 1, and the sealing gasket 6 is sealed with the upper mounting seat assembly 1, so that the top rubber 2 is sealed with 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 of the shock absorber, and the piston rod 3 is sleeved and passed through the sealing gasket 6, and the sealing gasket 6 and the piston rod 3 are interference fit, and the sealing gasket 6 and the piston rod 3 are sealed, so that the top rubber 2 and the piston rod 3 are sealed; under the cooperation of the sealing gasket 6 and the upper mounting seat assembly 1, and the sealing gasket 6 and the piston rod 3, the top rubber 2 and the piston rod 3, and the top rubber 2 and the upper mounting seat assembly 1 are effectively sealed, the top rubber 2 is in a sealed state and isolated from the internal air pressure of the air spring, and the pressure difference between the upper surface and the lower surface of the top rubber 2 is kept consistent, so as to avoid the lower surface of the top rubber 2 being subjected to the internal air pressure of the air spring, resulting in a large pressure difference between the upper surface and the lower surface of the top rubber 2 affecting the performance of the top rubber, thereby ensuring the performance of the top rubber 2, and then ensuring the performance and stability of the air spring, and improving the comfort of riding in the car. The outer wall of the sealing gasket 6 is gap-matched or fitted with the inner wall of the upper mounting seat assembly 1. The fastening assembly 5 is arranged on the top of the upper mounting seat assembly 1, and the top rubber 2 and the sealing gasket 6 are fixedly installed in 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 in an overall sealed state. The sealing gasket 6 supports and bears the pressure transmitted by the colloid of the top rubber 2. And 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 greater the internal air pressure, the tighter the sealing gasket 6 and the piston rod 3 fit, and the better the sealing effect.

[0026] As an implementation method, Figure 1 , Figure 2 , Figure 3As shown, the sealing gasket 6 comprises a colloid 61 and a skeleton 62 which are fixedly connected. 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. The inner side of the skeleton 62 is provided with an annular sealing structure 67. The inner diameter of the annular sealing structure 67 is smaller than the outer diameter of the piston rod 3 of the shock absorber. The colloid 61 and the skeleton 62 are annular. The skeleton 62 is fixed on the top or inside of the colloid 61. The colloid 61 and the skeleton 62 can be fixed by chemical bonding with adhesive or glue, or by heating and vulcanizing the colloid 61 and the skeleton 62, or by mechanical fixing with screws and nuts. The height of the protrusion of the bottom annular structure 65 is set by the pre-compression amount 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 convexly provided at the bottom of the colloid 61. 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 rubber 2 and the piston rod 3. The sealing gasket 6 and the top rubber 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 rubber 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 rubber 2, the nut 4 is used to tighten the top end of the piston rod 3 to fasten it to the top rubber 2. The top rubber 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 rubber 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 and passes 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 rubber 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 rubber 2 and the piston rod 3, the top rubber 2 and the upper mounting seat assembly 1 are effectively sealed, the top rubber 2 is in a sealed state and isolated from the internal air pressure of the air spring, the pressure difference between the upper surface and the lower surface of the top rubber 2 is kept consistent, so as to avoid the lower surface of the top rubber 2 being subjected to the internal air pressure of the air spring, resulting in a large pressure difference between the upper surface and the lower surface of the top rubber 2 affecting the performance of the top rubber 2, thereby ensuring the performance of the top rubber 2, and then ensuring the performance and stability of the air spring, thereby improving the comfort of riding in the car. In summary, the above-mentioned sealing gasket 6 only needs one sealing gasket 6 to effectively seal the top rubber 2 and the piston rod 3, and the top rubber 2 and the upper mounting seat assembly 1, with good sealing effect, few sealing elements required, and low cost; the pressure difference between the upper surface and the lower surface of the top rubber 2 is kept consistent to ensure 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 piston rod 3 of the shock absorber move axially relative to each other, and the annular sealing structure 67 of the sealing gasket 6 and the piston rod 3 of the shock absorber form a dynamic seal, and the amplitude of the relative movement is affected by the shape of the skeleton 62 of the sealing gasket 6, the performance of the colloid 61 and the size of the internal pressure of the air spring. The outer wall of the sealing gasket 6 and the inner wall of the upper mounting seat assembly 1 are gap-matched or fitted. The fastening assembly 5 is arranged on the top of the upper mounting seat assembly 8, and the top rubber 9 and the sealing gasket are fixedly installed in the seat hole of the upper mounting seat assembly 8. Under the cooperation of the fastening assembly 5, the bottom annular structure 65 and the annular sealing structure 67, the top rubber 2 is in an overall sealed state.The bottom annular structure 65 corresponds to the colloid position of the top rubber 2, a first groove opposite to the colloid of the top rubber 2 is set on the skeleton 62, and the colloid of the top rubber 2 is installed in the first groove, and the inner bottom surface of the upper mounting seat assembly 1 is provided with a second groove opposite to the bottom annular structure 65, and the bottom annular structure 65 is installed in the second groove, and the support skeleton 62 bears the pressure transmitted by the colloid of the top rubber 2 to improve stability. And under the action of the internal air pressure of the air spring, the annular sealing structure 67 and the piston rod 3 fit more closely, and the greater the internal air pressure, the tighter the annular sealing structure 67 and the piston rod 3 fit, and the better the sealing effect.

[0028] The skeleton 62 is an annular structure 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, which can better support and fill the colloid 61.

[0030] As an implementable embodiment, 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 implementation 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 frame 62 is fixed on the top of the colloid 61, so that the frame 62 and the colloid 61 can be bonded and fixed by heating and vulcanization, which has a simple manufacturing operation.

[0034] As an implementation method, Figure 1 , Figure 2 , Figure 3 As shown, the inner wall protrusion 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 the annular sealing lips 671 is one or more, such as one or two or more integers, and the 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 rubber 2 and the piston rod 3 of the shock absorber.

[0038] As an implementation 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 is pressed and deformed against the inner bottom surface of the upper mounting seat assembly 1, further enhancing the sealing and support of the top rubber 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 part, and the outer edge of the colloid 61 is bent downward to form a colloid bending part that cooperates with the skeleton bending part. The skeleton bending part is coated on the colloid bending part, and the edge annular structure 64 is arranged on the colloid bending part, and the edge annular structure 64 protrudes from the skeleton bending part. The skeleton bending part is inclined and chamfered away from the colloid bending part, and the edge annular structure 64 is arranged on the inclined surface of the colloid bending part.

[0040] As an implementation method, Figure 1 , Figure 3 As shown, 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 .

[0041] After the sealing gasket is assembled with the upper mounting seat assembly 1, the top rubber 2 and the piston rod 3, the top of the annular support structure 63 fits or contacts the frame of the top rubber 2, supporting the annular sealing structure 67, preventing the annular sealing structure 67 of the sealing gasket and the piston rod 3 of the shock absorber from axial relative movement 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 colloid 61 can be made by integral molding, the inner diameter of the annular support structure 63 is slightly larger than the outer diameter of the piston rod 3 of the shock absorber, the piston rod 3 of the shock absorber is sleeved in the annular support structure 63, and the piston rod 3 of the shock absorber is gap-matched with the annular support structure 63. A support frame is arranged inside the cylindrical annular support structure 63 to enhance the strength, rigidity and stability of the annular support structure 63.

[0042] As an implementation 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 installation groove is circumferentially arranged on the outer side wall of the annular sealing structure 67 , and the spring wire ring 66 is sleeved in the annular installation groove, applying radial inward pre-pressure to the annular sealing structure 67 , thereby improving the stability of the annular sealing structure 67 .

[0044] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions 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: The invention comprises a fastening component (5), an upper mounting seat component (1), a piston rod (3) and a nut (4); the fastening component (5) is arranged at the top of the upper mounting seat component (1); the top end side wall of the piston rod (3) is provided with an external thread matching with the nut (4); a sealing gasket (6) and a top glue (2) are provided in the seat hole of the upper mounting seat component (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); the bottom surface of the sealing gasket (6) abuts against the inner bottom surface of the seat hole of the upper mounting seat component (1); and the inner diameter of the sealing gasket (6) is smaller than the outer diameter of the piston rod (3).

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

3. A 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. A 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 protrusion 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 protruded with an edge annular structure (64), and the protrusion height of the edge annular structure (64) is smaller than the protrusion 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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