Buffer block for automobile air suspension

Abstract

The utility model provides a buffer block for an automobile air suspension, which comprises a buffer block body provided with a tail part, and the periphery of the tail part is in interference fit connection with a mounting bottom cup; an annular groove is formed in the tail part, and the annular groove and the buffer block body are coaxially arranged; and an elastic ring is placed in the annular groove. The problems that the size of a buffer block widely used at present in an air spring is prone to being affected by air pressure, and a product is prone to falling off from an installation bottom cup are solved, the stable installation size can be provided for the buffer block, and it is guaranteed that the system performance is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts and air suspensions, in particular to a buffer block used for automobile air suspensions. Background Art

[0002] At present, in the market, foamed polyurethane materials are widely used in automobile suspension buffer blocks due to their excellent compressibility, durability, and progressive stiffness. The buffer block is generally installed and fixed in the bottom cup supported on the shock absorber by the elastic compression force generated by the interference fit. However, in the application of automobile air suspension, the unique microporous structure of this material itself will cause volume compression or expansion as the air pressure in the air spring changes, resulting in changes in the size of the part. In extreme cases, the size of the buffer block becomes smaller, the interference fit with the bottom cup becomes smaller, and the elastic compression force is not enough to fix the buffer block in the bottom cup. Under the action of gravity, the part falls off from the bottom cup. This problem can lead to abnormal noise, potential early failure of the buffer block and other risk issues, which must be solved technically. Utility Model Content

[0003] Based on the above problems, the utility model provides a buffer block for automobile air suspension, which solves the problem in the prior art that the size of the buffer block in the air spring is affected by the change of air pressure and the product is easy to fall off from the fixed position.

[0004] A buffer block for an automobile air suspension, comprising:

[0005] A buffer block body, wherein the buffer block body has a tail portion, and an outer periphery of the tail portion is connected to the mounting bottom cup by interference fit;

[0006] The tail portion is provided with an annular groove, and the annular groove and the buffer block body are coaxially arranged;

[0007] An elastic ring is placed in the annular groove.

[0008] Furthermore, the annular groove is at the bottom end and / or the upper end of the tail portion.

[0009] Furthermore, the elastic ring is a solid elastic ring or a hollow elastic ring.

[0010] Furthermore, the cross-sectional shape of the elastic ring is circular, square or semicircular.

[0011] Furthermore, the elastic ring is an assembly part or an embedded part of the buffer block before foaming.

[0012] Furthermore, the mounting bottom cup has a groove, and when an interference fit connection is achieved between the groove and the outer periphery of the tail portion, the annular groove is located in the groove.

[0013] Furthermore, the elastic ring is formed by welding steel wires or by plastic injection molding.

[0014] Furthermore, the buffer block body is made of porous polyurethane.

[0015] The beneficial technical effect of the utility model is as follows: by arranging an elastic ring on the buffer block, the material of the elastic ring is a dense solid material, the influence of external pressure changes on its volume can be ignored, and the buffer block is pressed against the inner wall of the buffer block mounting base cup through internal tension to form a fixed connection, which solves the problem that the buffer blocks currently widely used in air springs are easily affected by air pressure in size and the product is easy to fall off from the mounting base cup, and can provide a stable installation size for the buffer block to ensure more stable system performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1-3 This is a schematic structural diagram of a buffer block for automobile air suspension according to the utility model;

[0017] in,

[0018] 1-buffer block body;

[0019] 2-Install the bottom cup;

[0020] 21-groove;

[0021] 3-Elastic ring;

[0022] 11- the tail of the buffer block body;

[0023] 11a-upper end;

[0024] 11b - bottom end;

[0025] 111-Annular groove. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0029] See also Figure 1 The utility model provides a buffer block for automobile air suspension, comprising:

[0030] A buffer block body (1), the buffer block body having a tail portion (11), the outer periphery of the tail portion (11) being connected to the mounting base cup (2) by interference fit;

[0031] The tail portion (11) is provided with an annular groove (111), and the annular groove (111) and the buffer block body (1) are coaxially arranged;

[0032] An elastic ring (3) is placed in the annular groove (111).

[0033] The tail portion of the buffer block body refers to the mounting end that is connected to the mounting base cup by interference fit, and the buffer block and the mounting base cup are fixedly connected by interference fit.

[0034] By arranging an elastic ring on the buffer block, the material of the elastic ring is a dense solid material, and the influence of external pressure changes on its volume can be ignored. The buffer block is pressed against the inner wall of the buffer block mounting base cup through internal tension to form a fixed connection. This solves the problem that the buffer blocks currently widely used in air springs are easily affected by air pressure in size and the product is easy to fall off from the mounting base cup. It can provide a stable installation size for the buffer block and ensure more stable system performance.

[0035] Furthermore, the annular groove (111) is at the bottom end (11b) and / or the upper end (11a) of the tail portion (11).

[0036] Preferably, the annular groove is arranged at the bottom end of the tail portion, or at the upper end of the tail portion.

[0037] Preferably, the annular groove is provided at both the upper end and the bottom end of the tail. A double annular groove is provided, and an elastic ring is placed in each annular groove, and more preferably, the buffer block is pressed against the inner wall of the buffer block mounting bottom cup.

[0038] Specifically, the annular groove and the buffer block body are coaxially arranged to ensure that the buffer block body is subjected to uniform tension all around.

[0039] Furthermore, the elastic ring (3) is a solid elastic ring or a hollow elastic ring.

[0040] Furthermore, the cross-sectional shape of the elastic ring (3) is circular, square or semicircular.

[0041] Furthermore, the elastic ring (3) is an assembly part or a pre-embedded part of the buffer block before foaming.

[0042] When it is an assembly part, the elastic ring is installed in the annular groove at the rear of the buffer block body by assembly.

[0043] When it is an embedded part, the elastic ring is placed in the mold of the buffer block body by embedding, and is directly fixed to the annular groove at the tail of the buffer block through the buffer block foaming process.

[0044] Furthermore, the mounting base cup (2) has a groove (21), and when an interference fit connection is achieved between the groove (21) and the outer periphery of the tail portion (11), the annular groove (111) is located in the groove (21).

[0045] The annular groove is located in the groove, that is, the elastic ring in the annular groove is in the groove of the mounting base cup at the tail, and the tail material of the buffer block body between the elastic ring and the groove of the mounting base cup is compressed, and the elastic ring is compressed to generate reverse tension, which presses the tail material of the buffer block in the groove of the mounting base cup to form a fixed connection. The material of the elastic ring is a dense solid material, and the effect of external pressure changes on its volume can be ignored. When the air pressure around the buffer block body increases, the tail will produce radial deformation. At this time, since the size of the elastic ring remains unchanged, the position of the tail of the buffer block body between the elastic ring and the groove of the mounting base cup can be effectively constrained. It can provide a stable installation size for the buffer block, ensure that the system performance is more stable, and solve the problem that the size of the currently widely used polyurethane buffer block in the air spring is easily affected by air pressure, and the product is easy to fall off from the mounting base cup.

[0046] Furthermore, the elastic ring (3) is made of metal or non-metal, such as steel, aluminum alloy, plastic, carbon fiber, etc. The processing method thereof is different according to the selected material.

[0047] Furthermore, the elastic ring (3) is formed by welding steel wires or by plastic injection molding.

[0048] Different grades of materials can be selected depending on the application requirements of the parts.

[0049] Specifically, the elastic ring is made of carbon fiber.

[0050] Furthermore, the material of the buffer block body (1) is porous polyurethane. The buffer block body (1) is formed by foaming in a mold cavity or by machining a prefabricated pipe.

[0051] The material of the buffer block body is porous polyurethane. The buffer block body is formed by foaming in a mold cavity or by machining a prefabricated pipe. Preferably, the material used for the buffer block body is an elastomeric material. The buffer block body of the utility model is preferably made of NDI type but not limited to NDI type porous polyurethane elastomer. The material properties of the porous polyurethane product of the utility model are as follows: its density range is 200 to 1000 kg / m measured according to DIN EN ISO 845 3, commonly used is 300 to 750kg / m 3 The tensile strength measured according to DIN EN ISO 1798 is in the range of 2 to 8 MPa, the elongation at break is in the range of 200% to 700%, or the tear strength measured according to DIN ISO 34-1B(b) is in the range of 4 to 12 N / mm. The material used needs to meet at least two of the above material performance requirements, three are better, and all four material performance requirements are best met.

[0052] The raw materials for the buffer block body are usually prepared based on isocyanate diisocyanatotoluene (TDI), naphthalene diisocyanate (NDI), preferably 2,6-diisocyanatotoluene (TODI) and 1,5-naphthalene diisocyanate (5-NDI) to prepare porous polyurethane elastomers. The buffer block body based on porous polyurethane material is usually foamed in a closed cavity of the mold. The prepared raw materials are injected into the closed cavity. The amount of injection is determined by the density of the parts that need to meet the performance requirements. The raw materials are foamed in the cavity at a certain temperature and time. The surface temperature of the cavity is usually 40 to 100°C, and the parts are demolded after being kept warm in the cavity for 5 to 60 minutes.

[0053] The utility model places an elastic ring in the buffer block body and uses the tension generated by the elastic ring after being stressed to firmly fix the buffer block in the mounting base cup, so it has a very good installation and fixing effect. When the buffer block is subjected to external air pressure, it can effectively prevent the buffer block from falling off from the mounting base cup. The risk of polyurethane buffer blocks falling off in air spring applications is basically eliminated. The buffer block of the utility model is easy to design and manufacture, and can effectively improve the installation and fixing force of the buffer block to prevent it from loosening.

[0054] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A buffer block for automobile air suspension, characterized in that: include: A buffer block body, wherein the buffer block body has a tail portion, and an outer periphery of the tail portion is connected to the mounting bottom cup by interference fit; The tail portion is provided with an annular groove, and the annular groove and the buffer block body are coaxially arranged; An elastic ring is placed in the annular groove.

2. A buffer block for automobile air suspension according to claim 1, characterized in that: The annular groove is at the bottom end and / or the upper end of the tail portion.

3. The buffer block for automobile air suspension according to claim 1, characterized in that: The elastic ring is a solid elastic ring or a hollow elastic ring.

4. The buffer block for automobile air suspension according to claim 1, characterized in that: The cross-sectional shape of the elastic ring is circular, square or semicircular.

5. The buffer block for automobile air suspension according to claim 1, characterized in that: The elastic ring is an assembly part or an embedded part before the buffer block is foamed.

6. A buffer block for automobile air suspension according to claim 2, characterized in that: The mounting bottom cup has a groove, and when an interference fit connection is achieved between the groove and the outer periphery of the tail portion, the annular groove is located in the groove.

7. The buffer block for automobile air suspension according to claim 1, characterized in that: The elastic ring is formed by welding steel wires or by plastic injection molding.

8. The buffer block for automobile air suspension according to claim 1, characterized in that: The material of the buffer block body is porous polyurethane.

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