Shock absorber oil seal cover and air spring

Abstract

The utility model discloses a shock absorber oil seal cover and air spring, shock absorber oil seal cover includes: cover body, it includes the vertical section of tubular, the horizontal section that forms annularly from the inside wall of the upper end portion of vertical section inwardly contracts, the inner peripheral surface of vertical section is equipped with several annular distribution's inner bulge interval, the central hole that communicates to the vertical section is formed in the middle of horizontal section, and the inner air passage for airflow is formed between the inside wall of vertical section and the two inner bulges of adjacent to several, inner lining ring is embedded in the inside of horizontal section and is arranged coaxially with horizontal section, the buffer ring of oil seal cover upper end surface can effectively solve the problem that the abnormal sound will be produced when the buffer block hits on the oil seal cover.

Description

Technical Field

[0001] This utility model belongs to the field of air spring accessories, and specifically relates to a shock absorber oil seal cover and an air spring. Background Technology

[0002] Most air springs on the market are equipped with oil seal caps, which protect the shock absorber's oil seal by bearing the force from the buffer block. The oil seal cap needs a certain strength during air spring operation, which can cause abnormal noise and also reduces the cost of assembly. Currently, there are two types of oil seal caps: with and without inserts. Oil seal caps without inserts have a simpler structure and are mainly suitable for forces from closed pistons, which are relatively small. Oil seal caps with inserts are suitable for air springs using open pistons, where the force from the buffer block is larger, requiring the insert to increase the strength of the cap itself. However, existing oil seal caps, after assembly with the shock absorber, have the same inner diameter across the upper, middle, and lower sections. This causes the oil seal cap to easily shift and tilt after impact, becoming stuck and unable to maintain coaxiality with the shock absorber. If further impacted while in this state, the oil seal cap is easily damaged. Utility Model Content

[0003] The purpose of this invention is to provide a shock absorber oil seal cover that can effectively reduce the impact force between the shock absorber and the buffer block, and reduce the noise generated during impact.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a shock absorber oil seal cover, comprising:

[0005] The cover body includes a tubular vertical section and a transverse section that tapers inward from the inner wall of the upper end of the vertical section to form an annular shape. The inner circumferential surface of the vertical section is provided with a plurality of annularly distributed inner protrusions. A central hole is formed in the middle of the transverse section, which communicates with the vertical section. A plurality of internal air passages for airflow are formed between the inner wall of the vertical section and two adjacent inner protrusions.

[0006] An inner lining ring is embedded inside the transverse segment and is coaxially arranged with the transverse segment;

[0007] The inner liner ring is fitted onto the piston rod of the shock absorber. The piston rod passes through the central hole and has a gap between it and the outer circumferential surface of the inner liner ring. The vertical section is fitted onto the upper end of the shock absorber cavity, and its inner protrusion is clamped onto the outer circumferential surface of the shock absorber cavity. At this time, several internal air passages for airflow are formed between the inner wall of the vertical section, the inner protrusion, and the outer circumferential surface of the shock absorber cavity. The vertical section is fixedly installed inside the air spring piston, which serves to protect the buffer block and the shock absorber oil seal while not affecting the airflow of the shock absorber.

[0008] In another embodiment, the outer circumferential surface of the vertical section is provided with a plurality of annularly distributed protrusions, each of which is arranged parallel to the axial direction of the cover body. A plurality of external air passages for airflow are formed between the outer wall of the vertical section and two adjacent external protrusions. When the vertical section is sleeved on the upper end of the shock-absorbing cavity of the shock absorber and its vertical section passes through the air spring piston, a plurality of external air passages for airflow are formed between the outer wall of the vertical section, the external protrusions and the inner circumferential surface of the air spring piston. The vertical section is fixedly inserted into the air spring piston, which protects the buffer block and the shock absorber oil seal while improving the airflow of the shock absorber and the air spring piston.

[0009] In another embodiment, the inner diameter of the middle section of the vertical segment along the axial direction is smaller than the inner diameters of the upper and lower sides of the middle section, and the inner diameter of the middle section is interference-fitted with the outer diameter of the upper end of the shock-absorbing cavity to ensure that the cover body can be firmly fitted onto the upper end of the shock-absorbing cavity.

[0010] In another embodiment, a top air passage communicating with the inner air passage is provided on the lower end face of the transverse section; this increases the airflow of the shock absorber and the air spring piston.

[0011] In another embodiment, the top airways are distributed in a divergent pattern on the lower end surface of the transverse segment with the axis of the transverse segment as the center line.

[0012] In another embodiment, a countersunk hole is provided in the top air passage. The countersunk hole is partially formed on the inner liner ring, and the spaced holes on the inner liner ring improve the flexibility of the inner liner ring, prevent the inner liner ring from breaking after a violent impact, and further improve the air volume of the shock absorber and the air spring piston.

[0013] In another embodiment, the countersunk hole extends through the inner liner ring.

[0014] In another embodiment, a plurality of concentrically arranged, annular buffer rings are formed on the upper surface of the transverse segment.

[0015] In another embodiment, the inner wall of the lower part of the middle section is conical with an inner diameter that increases from top to bottom.

[0016] This utility model also provides an air spring, which includes a shock absorber, an air spring piston, a buffer block, and a shock absorber oil seal cover sleeved on the shock absorber and passing through the air spring piston. The buffer block is located above the shock absorber, and the shock absorber oil seal cover is the aforementioned shock absorber oil seal cover.

[0017] The beneficial effects of this utility model are as follows: the buffer ring on the upper end face of the oil seal cover can effectively solve the problem of abnormal noise caused by the impact of the buffer block on the oil seal cover; the inner side of the vertical section adopts a structure that is thin in the middle and thick on both sides to cooperate with the shock absorber, solving the problem of improper assembly of the oil seal cover and the shock absorber; the inner liner ring is made of metal, solving the problem of insufficient strength of the oil seal cover when the buffer block impacts the oil seal cover; the ribs on the outside of the oil seal cover cooperate with the piston, solving the problem of insufficient air throttling area due to the small gap between the oil seal cover and the piston, which affects the stiffness of the air spring, and the risk of the piston falling off and the air spring leaking due to the large gap between the oil seal cover and the piston. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly process of this utility model;

[0019] Figure 2 This is a perspective view of the shock absorber oil seal cover in this utility model;

[0020] Figure 3 This is a perspective view of the shock absorber oil seal cover of this utility model from another angle;

[0021] Figure 4 for Figure 3 EE cross-section. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0023] like Figure 1 As shown, the air spring includes a shock absorber A, an air spring piston B, a buffer block C, and a shock absorber oil seal 1 that is sleeved on the shock absorber A and passes through the air spring piston B. The buffer block C is located above the shock absorber.

[0024] like Figure 2-4 As shown, the shock absorber oil seal cover 1 includes: a cover body 2 and an inner liner ring 3. The cover body 2 includes a tubular vertical section 4 and a transverse section 5 that tapers inward from the inner wall of the upper end of the vertical section 4 to form an annular shape. Several annularly distributed inner protrusions 6 are provided on the inner circumferential surface of the vertical section 4. A central hole 7 is formed in the middle of the transverse section 5, which connects to the vertical section 4. Several internal air passages 8 are formed between the inner wall of the vertical section 4, two adjacent inner protrusions 6, and the outer wall of the shock absorber cavity A2 of the shock absorber A. The inner liner ring 3 is embedded in the transverse section 5 and is coaxially arranged with the transverse section 5.

[0025] Specifically, the outer circumferential surface of the vertical section 4 is provided with several annularly distributed external protrusions 9. Each external protrusion 9 is arranged parallel to the axial direction of the cover body 2. Several external air passages 10 for airflow are formed between the outer wall of the vertical section 4, two adjacent external protrusions 9, and the inner circumferential surface of the air spring piston B. The inner liner ring 3 is sleeved on the piston rod A1 of the shock absorber A. The piston rod A1 passes through the central hole 7 and has a gap with the outer circumferential surface of the inner liner ring 3. When the vertical section 4 is sleeved on the upper end of the shock absorber cavity A2 of the shock absorber A and its vertical section 4 passes through the air spring piston B, the vertical section 4 is fixedly inserted into the air spring piston B, which protects the buffer block C and the oil seal of the shock absorber A while improving the airflow of the shock absorber A and the air spring piston B.

[0026] The inner diameter of the middle section of the vertical section 4 along the axial direction is smaller than the inner diameter of the upper and lower sides of the middle section. The inner wall of the lower part of the middle section is conical with an inner diameter that increases from top to bottom. The inner diameter of the middle section is interference-fitted with the outer diameter of the upper end of the shock-absorbing cavity A2 to ensure that the cover body 2 can be firmly fitted onto the upper end of the shock-absorbing cavity A2.

[0027] A top air passage 11, communicating with the inner air passage 8, is provided on the lower end face of the transverse section 5. The top air passage 11 is distributed in a divergent pattern on the lower end face of the transverse section 5 with the axis of the transverse section 5 as the center line, improving the airflow of the shock absorber A and the air spring piston B. A countersunk hole 12 is formed in the top air passage 11, part of which is formed on the inner liner ring 3 and penetrates through the inner liner ring 3. The spaced holes formed on the inner liner ring 3 improve the flexibility of the inner liner ring 3, preventing the inner liner ring 3 from breaking after a violent impact, and further improving the airflow of the shock absorber A and the air spring piston B. Several annular and concentrically arranged buffer rings 13 are formed on the upper end face of the transverse section 5 to solve the problem of abnormal noise caused by the impact of the buffer block C on the oil seal cover.

[0028] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the protection scope of this utility model. All equivalent changes or modifications made according to this utility model should be covered within the protection scope of this utility model.

Claims

1. A shock absorber oil seal cover, characterized in that, It includes: The cover body includes a tubular vertical section and a transverse section that tapers inward from the inner wall of the upper end of the vertical section to form an annular shape. The inner circumferential surface of the vertical section is provided with a plurality of annularly distributed inner protrusions. A central hole is formed in the middle of the transverse section, which communicates with the vertical section. A plurality of internal air passages for airflow are formed between the inner wall of the vertical section and two adjacent inner protrusions. The inner lining ring is embedded inside the transverse section and is coaxially arranged with the transverse section. The inner lining ring is made of metal. The outer circumferential surface of the vertical section is provided with a number of annularly distributed external protrusions. Each external protrusion is arranged parallel to the axial direction of the cover body. A number of external air passages for airflow are formed between the outer wall of the vertical section and two adjacent external protrusions. The inner diameter of the middle section of the vertical segment along the axial direction is smaller than the inner diameter of the upper and lower sides of the middle section; a number of ring-shaped and concentrically arranged buffer rings are formed on the upper end surface of the horizontal segment.

2. The shock absorber oil seal cover according to claim 1, characterized in that: The lower end face of the transverse section is provided with a top airway that communicates with the inner airway.

3. The shock absorber oil seal cover according to claim 2, characterized in that: The top airways are distributed in a radiating pattern on the lower end surface of the transverse segment with the axis of the transverse segment as the center line.

4. The shock absorber oil seal cover according to claim 2, characterized in that: A countersunk hole is provided in the top air passage, and part of the countersunk hole is formed on the inner liner ring.

5. The shock absorber oil seal cover according to claim 4, characterized in that: The countersunk hole penetrates the inner lining ring.

6. The shock absorber oil seal cover according to claim 1, characterized in that: The inner wall of the lower part of the middle section is conical in shape with an inner diameter that increases from top to bottom.

7. An air spring comprising a shock absorber, an air spring piston, a buffer block, and a shock absorber oil seal cap sleeved on the shock absorber and passing through the air spring piston, wherein the buffer block is located above the shock absorber, characterized in that: The shock absorber oil seal cover is any one of the shock absorber oil seal covers described in claims 1-6.

Images