Air spring support ring piston assembly and air spring

Abstract

The utility model discloses an air spring support ring piston assembly and an air spring, comprising a connecting piece, a support ring, and a piston. The support ring is fixedly connected to the outer circumferential outer wall of the connecting piece. The connecting piece, the support ring and the piston are press-fitted and fixed so that the support ring and the top of the piston are interference-fitted. In the utility model, the straight-cylindrical support ring is fixed by the outer circumferential outer wall of the connecting piece, so that it can directly support the connecting piece and have an interference fit with the piston, thereby improving the supporting strength of the connecting piece and ensuring that the guide tube of the air spring only contacts the inner side of the connecting piece during movement, and does not contact the support ring to generate friction noise.

Description

Technical Field

[0001] The utility model relates to the technical field of air springs, and more specifically to an air spring support ring piston assembly and an air spring. Background Art

[0002] In the field of passenger cars, air springs are important components that connect the chassis and the body. By adjusting the internal air pressure to change the stiffness of the air springs, the vehicle's handling and stability can be achieved during driving. This structure is more suitable for reducing road impact. Semi-active suspensions and active suspensions represented by air suspensions are gradually becoming standard for mid- to high-end passenger cars. Compared with traditional coil springs, the biggest difference between air springs and traditional coil springs is the use of a bladder structure instead of a wire spring. The bladder is divided into an inner rubber layer, a cord wire, and an outer rubber layer. Pressing rings are used at the upper and lower ends of the bladder to press the bladder, the air intake seat, and the bladder and the piston circumference to bring the bladder compression ratio to a reasonable range, thereby ensuring that the air spring will not leak, bladder ring detachment, and other defects. It can be seen that pressing is a key process for the entire air spring. Figure 1 As shown, the piston is formed by a water expansion die using an aluminum alloy material. At this time, the pressure ring applies a load to the bladder through a crimping machine, which is transmitted to the aluminum alloy piston and causes deformation. Therefore, this product adds a support ring 2 at the mouth of the connecting piece 1. The support ring has an arc surface and is located inside the connecting piece 1 to support the pressure ring 4 and the bladder 5 to ensure that the crimping position will not produce permanent plastic deformation.

[0003] However, in the actual production process, this structure has some defects:

[0004] 1. Plastic parts shrink during the actual injection molding process, the outer diameter of the plastic parts is poorly consistent, and the outer diameter of the assembly is prone to ellipse, which leads to inaccurate buckling dimensions. The long-term movement of the pressure ring will cause air leakage, resulting in product failure.

[0005] 2. The thickness of the internal metal part, i.e., the support ring 2, is affected by the injection molding process of the connector 1 and needs to be completely injection molded inside the connector 1. At this time, only by reducing the thickness of the support ring 2 can the injection molding process requirements be met. The thinner the metal part, the less support strength will be, and it cannot provide a safe support coefficient for buckling. Utility Model Content

[0006] The technical problem to be solved by the utility model is how to improve the supporting force of the connecting piece.

[0007] The utility model solves the above-mentioned technical problems through the following technical means: an empty spring support ring piston assembly, including a connecting piece, a support ring, and a piston, wherein the support ring is fixedly connected to the outer circumferential outer wall of the connecting piece, and the connecting piece, the support ring and the piston are press-fitted and fixed so that the support ring and the top of the piston have an interference fit.

[0008] As a preferred technical solution, it also includes a bladder and a pressure ring, and the bladder is fastened to the piston through the pressure ring.

[0009] As a preferred technical solution, the support ring can cover the vertical connection surface between the connecting piece and the piston.

[0010] As a preferred technical solution, an installation groove adapted to the support ring is provided on the outer wall of the connecting piece.

[0011] As a preferred technical solution, the support ring is in a straight-cylindrical configuration.

[0012] As a preferred technical solution, the outer edge of the top of the support ring and the top of the installation groove form an overlapping portion that is compatible with the top of the piston.

[0013] As a preferred technical solution, the supporting force of the supporting ring is greater than the buckling pressure of the pressing ring.

[0014] As a preferred technical solution, the bladder includes a first connecting portion and a second connecting portion, one side of the first connecting portion abuts against the pressure ring and the other side abuts against the piston, and the second connecting portion is arranged outside the pressure ring.

[0015] As a preferred technical solution, one end of the piston connected to the first connecting portion is provided with a serration portion.

[0016] An air spring comprises the above-mentioned air spring support ring piston assembly.

[0017] The beneficial effects of the utility model are:

[0018] (1) In the utility model, a straight cylindrical support ring is fixed to the outer circumferential outer wall of the connecting piece, so that it can directly support the connecting piece and has an interference fit with the piston, thereby improving the supporting strength of the connecting piece and ensuring that the guide tube of the air spring only contacts the inner side of the connecting piece during movement, and does not contact the support ring to generate friction noise.

[0019] (2) In the present invention, since the lateral supporting force of the connecting member is improved, the thickness of the pressure ring can be thickened to improve the overall supporting force. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a connector structure provided as the background technology of the utility model;

[0021] Figure 2 A schematic diagram of the structure of an empty spring support ring piston assembly provided as the background technology of the utility model;

[0022] Figure 3 A schematic diagram of the structure of the empty spring support ring piston assembly provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the support ring structure provided by an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of a piston cross-section structure provided in an embodiment of the utility model;

[0025] Figure 6 A schematic diagram of the cross-sectional structure of an air spring provided in an embodiment of the utility model;

[0026] Figure numbers: 1, connecting piece; 11, mounting groove; 2, support ring; 3, piston; 4, pressure ring; 5, bladder; 51, first connecting part; 52, second connecting part; 6, intake seat; 7, guide tube. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] See also Figure 3 , Figure 4 A hollow spring support ring piston assembly comprises a connector 1, a support ring 2 and a piston 3. The connector 1 is provided with an annular mounting groove 11 on the circumferential outer side, and the support ring 2 is fixedly connected in the mounting groove 11. An overlap portion is formed between the top of the mounting groove 11 and the outer edge of the top of the connector 1. The connector 1 is interference fit with the top of the piston 3 through the support ring 2, and the overlap portion overlaps with the top of the piston 3. A bladder 5 comprises a first connecting portion 51 and a second connecting portion 52. The first connecting portion 51 is arranged on the outer side of the top of the piston 3 and is fastened to the connector 1, the support ring 2 and the piston 3 through a pressure ring 4. The first connecting portion 51 is connected to the second connecting portion 52. The second connecting portion 52 of the bladder 5 wraps the pressure ring 4 between it and the first connecting portion 51, and the first connecting portion 51 and the second connecting portion 52 are also fixed by vulcanization for a second time. A serration portion is also provided on the end of the piston 3 connected to the first connecting portion 51.

[0030] See also Figure 4The support ring 2 and the piston 3 are split structures. The support ring 2 is a metal ring, and its circumferential inner and outer walls are generally straight surfaces, and can also be set as straight surfaces. In this embodiment, the inner wall diameter of the top of the metal ring is smaller than the inner wall diameter of the bottom. The support ring 2 is made of 45 steel and is fixed to the mounting groove 11 of the connector 1 by vulcanization. The support ring 2 can cover the entire vertical connection surface between the connector 1 and the piston 3 and provide strength support for the connector 1 and the piston 3. The connector 1 is made of plastic, which can be nylon. The support ring 2 is set on the circumferential outer side of the connector 1 to provide strength support for the connector 1 and the piston 3, ensuring that the guide tube 7 only contacts the inner wall of the connector 1 on the inner side of the support ring 2 during movement, and will not contact the support ring 2 to produce friction noise.

[0031] Installation method:

[0032] See also Figure 5 , Figure 6 During the installation of the support ring 2, the support ring 2 is fixed and vulcanized on the outside of the connecting piece 1 to form an integral part. The inner wall of the connecting piece 1 is still a plastic structure to ensure that the guide tube 7 of the air spring contacts the inner wall of the connecting piece 1 during movement and does not contact the support ring 2 to produce friction noise. At this time, the support ring 2 is pressed together by a press and a piston 3, and then the bladder 5 is assembled at the outer end buckling position, and the bladder 5 is buckled by the pressing ring 4 to fix the first connecting part 51 of the bladder 5, that is, the bladder 5 is preliminarily fixed to ensure that the supporting force inside the support ring 2 is greater than the buckling pressure of the pressing ring 4 to ensure that no deformation occurs, thereby meeting the limit explosion requirements of the air spring and ultimately meeting the use conditions of the entire vehicle.

[0033] Example 2

[0034] An air spring comprises the empty spring support ring piston assembly, an air intake seat 6 and a guide tube 7 in Example 1, wherein the bottom end of the air intake seat 6 is fixed to the bladder 5, the top end of the guide tube 7 is fixed to the air intake seat 6, and the empty spring support ring piston assembly can move toward or away from the air intake seat 6.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An empty spring support ring piston assembly, comprising a connecting piece, a support ring, and a piston, characterized in that: The support ring is fixedly connected to the outer circumferential outer wall of the connecting piece, and the connecting piece, the support ring and the piston are press-fitted and fixed so that the support ring and the top of the piston are interference-fitted.

2. The empty spring support ring piston assembly according to claim 1, characterized in that: It also includes a bladder and a pressure ring, and the bladder is connected and fastened to the piston through the pressure ring.

3. The empty spring support ring piston assembly according to claim 1, characterized in that: The support ring can cover the vertical connection surface between the connecting piece and the piston.

4. The empty spring support ring piston assembly according to claim 1, characterized in that: The outer wall of the connecting piece is provided with a mounting groove matched with the supporting ring.

5. The empty spring support ring piston assembly according to claim 1, characterized in that: The support ring is arranged in a straight cylinder shape.

6. The empty spring support ring piston assembly according to claim 4, characterized in that: The outer edge of the top of the support ring and the top of the installation groove form an overlapping portion that is matched with the top of the piston.

7. The empty spring support ring piston assembly according to claim 2, characterized in that: The supporting force of the supporting ring is greater than the buckling pressure of the pressing ring.

8. The empty spring support ring piston assembly according to claim 2, characterized in that: The bladder includes a first connecting portion and a second connecting portion, one side of the first connecting portion abuts against the pressure ring, and the other side abuts against the piston, and the second connecting portion is arranged outside the pressure ring.

9. The empty spring support ring piston assembly according to claim 8, characterized in that: The end of the piston connected to the first connecting part is provided with a serration part.

10. An air spring, characterized in that: It comprises the empty spring support ring piston assembly as described in any one of claims 1-9.

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