Abnormal sound prevention structure of air spring

Abstract

The utility model provides an abnormal sound prevention structure of an air spring, relates to the technical field of air springs, and aims to solve the technical problem that in the prior art, abnormal sound is easily generated between a piston and an oil seal cover, and then the service life is affected. An air spring abnormal sound prevention structure comprises a piston, an oil seal cover and a sealing ring, an annular sealing groove is formed in the peripheral wall of the oil seal cover, the sealing ring is clamped in the sealing groove, a through hole is formed in the piston in the axial direction, an annular protruding part is arranged on the inner wall of the through hole in the circumferential direction, the oil seal cover is inserted into the protruding part, and the sealing ring abuts against the inner wall of the protruding part to be compressed; the sealing groove is formed in the oil seal cover and used for installing the sealing ring, the protruding part is arranged in the through hole of the piston and used for being matched with the oil seal cover, after the oil seal cover is pressed into an inner hole of the protruding part, the gap between the piston and the oil seal cover is filled with the sealing ring due to extrusion deformation, and abnormal sound generated when the piston makes contact with the oil seal cover when the air spring is twisted is avoided; and the service lives of the piston, the oil seal cover and even the air spring are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air springs, in particular to an air spring anti-abnormal noise structure. Background Art

[0002] Passenger car air suspension systems replace traditional coil springs with air springs, achieving adjustable vehicle height, consistent suspension frequency deviation under varying loads, and absorbing and filtering high-frequency road shock, thereby improving vehicle ride comfort and handling stability. The core component of an air spring is the airbag, a composite of rubber and cord layers. This airbag ensures the air spring's airtightness, pressure-bearing properties, and travel capacity. Because an air spring operates as a closed system, internal pressure increases or decreases as it compresses or stretches.

[0003] Current air springs and front shock absorbers typically mate with each other by inserting the front shock absorber's outer cylinder through the air spring piston, creating a clearance fit. However, in real-world vehicle conditions, when the vehicle turns or experiences significant deflection of the air spring, the piston can come into contact with the shock absorber's oil seal, producing unusual noise. Over time, this can also shorten the air spring's service life. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an air spring anti-noise structure to solve the technical problem in the existing technology that abnormal noise is easily generated between the piston and the oil seal cover, thereby affecting the service life.

[0005] In order to solve the above technical problems, the utility model provides an air spring anti-noise structure, including a piston, an oil seal cover and a sealing ring. The outer peripheral wall of the oil seal cover is provided with an annular sealing groove, and the sealing ring is clamped in the sealing groove. A through hole is provided in the axial direction of the piston, and an annular protrusion is provided on the inner wall of the through hole along the circumferential direction. The oil seal cover is inserted into the protrusion and the sealing ring is compressed by being pressed against the inner wall of the protrusion.

[0006] After adopting the above structure, the utility model has the following advantages of an air spring anti-abnormal noise structure: a sealing groove is provided on the oil seal cover for installing a sealing ring, and a protrusion is provided in the piston through hole for cooperating with the oil seal cover; after the oil seal cover is pressed into the inner hole of the protrusion, the sealing ring is squeezed and deformed by the protrusion to fill the gap between the piston and the oil seal cover to alleviate the impact, thereby avoiding abnormal noise caused by contact between the piston and the oil seal cover when the air spring is twisted, and also improving the service life of the piston, the oil seal cover and even the air spring.

[0007] As an improvement, a number of air holes are distributed circumferentially on the protrusion, and each air hole passes through the protrusion vertically; this structure solves the problem of the piston air chamber and the bladder skin air chamber being connected.

[0008] As an improvement, a number of air holes are evenly distributed along the circumference of the protrusion; with this structure, the evenly distributed air holes make the flow of gas between the piston air chamber and the bladder skin air chamber smoother.

[0009] As an improvement, the cross-sectional area of ​​each air hole is greater than or equal to 110 square millimeters; this structure avoids howling at the air hole due to the small air hole area during the expansion and contraction of the air spring.

[0010] As an improvement, the upper end surface inside the oil seal cover is connected with an annular metal insert; with this structure, the upper end surface of the oil seal cover will collide and contact with other structures during the expansion and contraction of the air spring. By providing the metal insert, the structural strength of the oil seal cover is improved, thereby extending the service life of the air spring.

[0011] As an improvement, an annular groove is provided at the upper end of the interior of the oil seal cover, and the inner wall on the outer side of the annular groove penetrates into the inner wall of the oil seal cover and forms a horizontal step surface on the oil seal cover. An annular limiting portion is provided at the lower part of the inner wall on the inner side of the annular groove, and the metal insert is embedded in the annular groove and the bottom end of the metal insert is against the step surface and the upper end surface of the limiting portion; this structure is adopted to improve the stability of the connection between the metal insert and the oil seal cover.

[0012] As an improvement, the inner diameter of the sealing groove is 59.6mm, the outer diameter of the oil seal cover is 64.9mm, and the size of the sealing ring is φ58*3.55mm; with this structure, the outer wall of the sealing ring is exposed outside the outer wall of the oil seal cover, so that the sealing ring can contact the inner wall of the protrusion and deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the present invention.

[0014] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0015] Figure 3 for Figure 1 A partial enlarged view of part B in the middle.

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 5 It is a top view of the utility model.

[0018] Figure 6 It is a schematic diagram of the three-dimensional structure of the piston in the utility model.

[0019] Figure numerals: 1. piston; 2. oil seal cover; 3. sealing ring; 4. sealing groove; 5. through hole; 6. protrusion; 7. air hole; 8. metal insert; 9. annular groove; 10. step surface; 11. limit part. DETAILED DESCRIPTION

[0020] The following is a detailed description of an air spring anti-noise structure of the present invention in conjunction with the accompanying drawings.

[0021] like Figures 1 to 6 As shown, an air spring anti-noise structure includes a piston 1, an oil seal cover 2 and a sealing ring 3. The outer peripheral wall of the oil seal cover 2 is provided with an annular sealing groove 4, and the sealing ring 3 is clamped in the sealing groove 4. The inner diameter of the sealing groove 4 is 59.6 mm, the outer diameter of the oil seal cover 2 is 64.9 mm, the height of the sealing groove 4 is 4.8 mm, and the size of the sealing ring 3 is φ58*3.55 mm, that is, the inner diameter of the sealing ring 3 is 58 mm, and the cross-sectional diameter of the sealing ring 3 is 3.55 mm.

[0022] like Figure 1 、 Figure 2 and Figure 6 As shown, a through hole 5 is provided in the axial direction of the piston 1. The axial direction of the piston 1 is the vertical direction. The inner wall of the through hole 5 is provided with an annular protrusion 6 in the circumferential direction. The oil seal cover 2 is inserted into the protrusion 6 and the sealing ring 3 is pressed against the inner wall of the protrusion 6 and compressed. That is, an interference fit between the oil seal cover 2 and the piston 1 is achieved through the sealing ring 3 and the protrusion 6.

[0023] like Figure 5 and Figure 6 As shown, a plurality of air holes 7 are distributed circumferentially on the protrusion 6, each air hole 7 vertically penetrates the protrusion 6, and each air hole 7 is in the shape of an arc-shaped waist hole, and a plurality of air holes 7 are equidistantly distributed along the circumference of the protrusion 6, and the cross-sectional area of ​​each air hole 7 is greater than or equal to 110 square millimeters; In this embodiment, a total of four air holes 7 are provided on the protrusion 6, and the cross-sectional area of ​​each air hole 7 is 150 square millimeters.

[0024] like Figure 1 and Figure 3 As shown, the upper end surface of the inner part of the oil seal cover 2 is connected with an annular metal insert 8. Specifically, the upper end of the inner part of the oil seal cover 2 is provided with an annular groove 9. The inner wall on the outer side of the annular groove 9 penetrates into the inner wall of the oil seal cover 2 and forms a horizontal step surface 10 on the oil seal cover 2. In other words, the outer diameter of the inner wall on the outer side of the annular groove 9 is larger than the diameter of the inner wall of the oil seal cover 2, thereby forming a horizontal step surface 10. Figure 3 As shown; an annular limiting portion 11 is provided on the annular groove 9 and on the lower part of the inner wall close to the inner side, the metal insert 8 is embedded in the annular groove 9 and the bottom end of the metal insert 8 is against the step surface 10 and the upper end surface of the limiting portion 11; wherein, a notch is provided on the metal insert 8 corresponding to the position of the limiting portion 11, and in fact, the bottom end of the notch of the metal insert 8 is against the upper end surface of the limiting portion 11, and the material of the metal insert 8 is preferably 45 steel.

[0025] The utility model provides a sealing groove 4 on the oil seal cover 2 for installing the sealing ring 3, and provides a protrusion 6 in the through hole 5 of the piston 1 for cooperating with the oil seal cover 2. After the oil seal cover 2 is press-fitted into the inner hole of the protrusion 6, the sealing ring 3 is squeezed and deformed by the protrusion 6 to fill the gap between the piston 1 and the oil seal cover 2 to alleviate the impact, thereby avoiding the abnormal noise caused by the contact between the piston 1 and the oil seal cover 2 when the air spring is twisted, and also improving the service life of the piston 1, the oil seal cover 2 and even the air spring; and by providing an air hole 7 with a certain area and a metal insert 8 at the oil seal cover 2, it is further possible to avoid abnormal noise and improve the service life of the air spring.

[0026] The above describes the implementation mode of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned implementation mode. All other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An air spring anti-noise structure, characterized in that: The invention comprises a piston (1), an oil seal cover (2) and a sealing ring (3); the outer peripheral wall of the oil seal cover (2) is provided with an annular sealing groove (4); the sealing ring (3) is clamped in the sealing groove (4); a through hole (5) is provided in the axial direction on the piston (1); an annular protrusion (6) is provided on the inner wall of the through hole (5) in the circumferential direction; the oil seal cover (2) is inserted into the protrusion (6) so that the sealing ring (3) is pressed against the inner wall of the protrusion (6) and compressed.

2. The air spring anti-noise structure according to claim 1, characterized in that: A plurality of air holes (7) are distributed circumferentially on the protrusion (6), and each of the air holes (7) vertically penetrates the protrusion (6).

3. The air spring anti-noise structure according to claim 2, characterized in that: The plurality of air holes (7) are distributed equidistantly along the circumference of the protrusion (6).

4. The air spring anti-noise structure according to claim 2, characterized in that: The cross-sectional area of ​​each of the air holes (7) is greater than or equal to 110 square millimeters.

5. The air spring anti-noise structure according to claim 1, characterized in that: An annular metal insert (8) is connected to the upper end surface inside the oil seal cover (2).

6. The air spring anti-noise structure according to claim 5, characterized in that: An annular groove (9) is provided at the upper end of the interior of the oil seal cover (2). The inner wall of the annular groove (9) on the outer side penetrates into the inner wall of the oil seal cover (2) and forms a horizontal step surface (10) on the oil seal cover (2). An annular limiting portion (11) is provided at the lower portion of the inner wall of the annular groove (9) on the inner side. The metal insert (8) is embedded in the annular groove (9) and the bottom end of the metal insert (8) abuts against the step surface (10) and the upper end surface of the limiting portion (11).

7. The air spring anti-noise structure according to claim 1, characterized in that: The inner diameter of the sealing groove (4) is 59.6 mm, the outer diameter of the oil seal cover (2) is 64.9 mm, and the size of the sealing ring (3) is φ58*3.55 mm.

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