JPH04111933U - Cylindrical anti-vibration rubber - Google Patents

Abstract

(57) [Summary] [Purpose] To equalize the degree of preliminary compression of the elastic body 4 in the radial direction over the circumferential direction. Structure: In a rubber bush consisting of an inner cylinder 1, an outer cylinder 2, a cylindrical intermediate member 3, and a cylindrical elastic body 4, the intermediate member 3 is made of a rubber material with higher rigidity than the elastic body 4. Due to the diameter reduction of the outer cylinder 2, the intermediate member 3 receives a substantially uniform load in the circumferential direction, and the diameters of the intermediate member 3 and the elastic body 4 are reduced substantially uniformly in the circumferential direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a cylindrical anti-vibration rubber having an intermediate member that increases the spring constant in the direction perpendicular to the axis. . This cylindrical anti-vibration rubber is applied to rubber bushings used in automobile suspension systems, for example. can.

0002

[Conventional technology]

Traditionally, cylindrical anti-vibration rubber, such as rubber bushings used in automobile suspension systems, has been used. As shown in FIG. a metal outer cylinder 200 interposed between the inner cylinder 100 and the outer cylinder 200; It is known that the intermediate member 300 is composed of an elastic body 400 made of a rubber material. It is. Here, the elastic body 400 is interposed between the intermediate member 300 and the inner cylinder 100. the inner elastic body 400a and the outer side interposed between the intermediate member 300 and the outer cylinder 200. It consists of an elastic body 400b. The intermediate member 300 has a slit 301 extending in the axial direction. is formed. Then, by narrowing the entire circumferential wall of the outer cylinder 200 to reduce the diameter. , gives precompression to the outer elastic body 400b in the radial direction, and applies precompression to the inner elastic body 40b. Preliminary compression is also applied to 0a in the radial direction. elasticity given precompression The body 400 has improved durability and extended lifespan. This rubber bushing is made of metal cylinder. Since the highly rigid intermediate member 300 is provided, the spring constant in the direction perpendicular to the axis is When K1 is the spring constant in the axial direction and K2 is the spring constant in the axial direction, the value of (K1/K2) is increased. It has advantages that can be achieved.

0003 Furthermore, conventionally, as another rubber bushing that can increase the value of (K1/K2), It is also known that the member 300 has a two-part structure.

0004

[Problem that the idea aims to solve]

By the way, in the above rubber bushing, the slit 301 is formed in the intermediate member 300. , the intermediate member 300 can flex in the radial direction, so that the intermediate member 300 Preliminary compression is also applied to the inner elastic body 400a on the inner side of the inner elastic body 300. But inside In the elastic body 400a, in a portion 400e that does not face the slit 301, the outer cylinder 20 Since the diameter reducing force of 0 does not directly act, the degree of pre-compression does not become very high.

[0005] Therefore, the degree of preliminary compression of the inner elastic body 400a in the radial direction is A portion 400e that does not face 01 and a portion 400c that faces slit 301. different. The present invention has been made in view of the above-mentioned circumstances, and claims 1 to 3 both satisfy the above-mentioned circumstances. The purpose is to make the degree of precompression of the elastic body uniform in the radial direction in the circumferential direction. The purpose of the present invention is to provide an advantageous cylindrical anti-vibration rubber.

[0006]

[Means to solve the problem]

The cylindrical anti-vibration rubber according to claim 1 includes an inner cylinder and an outer cylinder disposed on the outer peripheral side of the inner cylinder. , a cylindrical intermediate member interposed between the inner cylinder and the outer cylinder, and between the intermediate member and the inner cylinder and It has a cylindrical elastic body made of rubber material interposed between the intermediate member and the outer cylinder, and the outer cylinder The elastic body is precompressed in the radial direction by at least one of reducing the diameter of the inner cylinder and expanding the diameter of the inner cylinder. It consists of The intermediate member is made of a rubber material that is more rigid than the rubber material that makes up the elastic body. It is characterized by the presence of

[0007] As mentioned above, the intermediate member according to claim 1 is made of rubber material constituting the elastic body. It is also made of highly rigid rubber material. For example, the rubber material that makes up the elastic body When the rubber hardness is Hs45 to Hs55, the rubber hardness of the rubber material constituting the intermediate member is Hs can be 70-90. The cylindrical anti-vibration rubber according to claim 2 includes an inner cylinder and an outer cylinder disposed on the outer peripheral side of the inner cylinder. , an intermediate member interposed between the inner cylinder and the outer cylinder, and an intermediate part between the intermediate member and the inner cylinder. It has a cylindrical elastic body made of rubber material interposed between the material and the outer cylinder, and the diameter of the outer cylinder is reduced. The elastic body is precompressed in the radial direction by at least one of the expansion diameter of the inner cylinder and is, The intermediate member includes a cylindrical fiber-reinforced layer that is more rigid than the rubber material that makes up the elastic body; It is characterized by being composed of a rubber material bonded to a fiber reinforcing layer. Ru. Since the intermediate member according to claim 2 has a fiber reinforced layer, the rubber constituting the elastic body More rigid than other materials. The fibers that make up the fiber reinforcement layer are organic fibers, inorganic fibers, Metal fiber type can be used. Specifically, the fiber reinforcement layer can be formed from canvas.

[0008] The cylindrical anti-vibration rubber according to claim 3 includes an inner cylinder and an outer cylinder disposed on the outer peripheral side of the inner cylinder. , an intermediate member interposed between the inner cylinder and the outer cylinder, and an intermediate part between the intermediate member and the inner cylinder. It has a cylindrical elastic body made of rubber material interposed between the material and the outer cylinder, and the diameter of the outer cylinder is reduced. The elastic body is precompressed in the radial direction by at least one of the expansion diameter of the inner cylinder and is, The intermediate member includes a large number of complements arranged circumferentially and extending substantially parallel to the axial direction of the inner cylinder. It is made up of a strong wire material and a flexible binding material that binds each reinforcing wire material into a cylindrical shape. This is a characteristic feature. Since the intermediate member according to claim 3 has a reinforcing wire, it has elasticity. It is more rigid than the rubber material that makes up its body. The reinforcing wire is made of high quality material such as metal or resin. The cord may be made of a rigid material. Steel and aluminum alloys are used as metals. Can be used. Flexible binding material is a material that binds a large number of reinforcing wires into a cylindrical shape. For example, a rubber material or a string member can be used.

[0009] In claims 1 to 3, the elastic body is at least one of reducing the diameter of the outer cylinder and expanding the diameter of the inner cylinder. is precompressed in the radial direction by In addition, the diameter, thickness, material, etc. of the inner cylinder and outer cylinder are You can choose as appropriate. The inner cylinder, outer cylinder and intermediate member can be arranged coaxially, A non-coaxial arrangement may be used depending on the case. The inner cylinder, outer cylinder and intermediate member are in contact with the elastic body. It may be attached or may be non-adhesive depending on the case. Adhesion is adhesive, vulcanization Either way is fine.

0010

[Effect]

In cylindrical anti-vibration rubber, if the diameter of the outer cylinder is reduced, the intermediate member will move in the circumferential direction. The intermediate member is subjected to a substantially uniform load over the entire length, and the diameter of the intermediate member is reduced substantially uniformly. In addition, the inner cylinder When the diameter of the intermediate member is expanded, the intermediate member receives a substantially uniform load in the circumferential direction , the diameter of the intermediate member is expanded substantially uniformly.

[0011] In addition, since the intermediate member has higher rigidity than the rubber material that makes up the elastic body, it The spring constant at is high.

0012

【Example】

(First example) A first embodiment of the present invention will be described based on FIGS. 1 and 2. Figure 1 is a vertical cross-sectional view of the finished product. , and FIG. 2 shows a sectional view taken along line W-W. As shown in Figs. 1 and 2, this bushing consists of an inner cylinder 1, an outer cylinder 2, an intermediate member 3, and an elastic body. It consists of 4.

[0013] The inner cylinder 1 is made of steel and has a central hole 10 with an axis P1. The outer cylinder 2 is made of steel. It is arranged substantially coaxially on the outside of the inner cylinder 1. The intermediate member 3 has a cylindrical shape, and the inner It is interposed substantially coaxially between the cylinder 1 and the outer cylinder 2. The intermediate member 3 is made of rubber material. However, the rubber hardness is about Hs70 to Hs90. The thickness of the intermediate member 3 is 1 to 5 m. It is said to be about m. Also, as can be understood from Fig. 1, the length of the intermediate member 3 in the axial direction is It is said to be about the same as the outer cylinder 2.

[0014] The elastic body 4 is made of a rubber material with a rubber hardness of about 45 to 55 Hs. follow The rubber material constituting the intermediate member 3 is higher than the rubber material constituting the elastic body 4. It is rigid. The elastic body 4 is a cylindrical inner elastic body interposed between the intermediate member 3 and the inner cylinder 1. It consists of a body 41 and a cylindrical outer elastic body 42 interposed between the intermediate member 3 and the outer cylinder 2. Ru.

[0015] In this embodiment, the inner tube 1, the outer tube 2, and the intermediate member 3 are bonded to the elastic body 4. In this example, during manufacturing, a swage with a large number of split molds arranged in the radial direction was used. Using a rubber bushing device, place the rubber bushing before the drawing process in the radial center area of each split mold. Then, move the split molds radially and centripetally, and the tip of each split mold The entire circumferential wall of the cylinder 2 is compressed and narrowed to reduce its diameter. In this way, the circumference of outer cylinder 2 By reducing the diameter of the entire wall, the outer elastic body 42 is uniformly pre-compressed. Moreover, in the middle Compared to the case where the member is made of a metal cylinder, the diameter of the rubber intermediate member 3 is reduced almost uniformly. As a result, the inner elastic body 41 is also pre-compressed almost uniformly.

[0016] Furthermore, in this embodiment, as described above, the rubber intermediate member 3 is more uniform than the metal cylinder. Since the diameter is reduced uniformly, it is advantageous to avoid local stress concentration near the intermediate member 3. In this sense as well, the durability and life of the elastic body 4 can be improved. In this rubber bushing, an external force acts in the direction of arrow A1, which is perpendicular to the axis. Therefore, when the outer cylinder 2 is relatively displaced, the inner elastic body 41 and the outer elastic body of the elastic body 4 The body 42 undergoes compression and tension deformation. Also, along the circumferential direction of arrow B1, the outer cylinder 2 undergoes relative displacement, the elastic body 4 undergoes shear deformation. Furthermore, in the axial direction When the outer cylinder 2 is relatively displaced along the arrow C1 direction, the inner elastic body of the elastic body 4 41 and the outer elastic body 42 undergo shear deformation. In this embodiment, the highly rigid intermediate member 3 is Therefore, the spring constant in the direction perpendicular to the axis is K3, and the spring constant in the axial direction is K3. When the spring constant is K4, the spring constant K3 can be set higher as in the conventional case shown in Fig. 3. can increase the value of (K3/K4). (Other examples) In the above embodiment, both the outer circumferential surface of the inner cylinder 1 and the inner circumferential surface of the outer cylinder 2 are elastic, as described above. Although the elastic body 4 is bonded to the elastic body 4, the present invention is not limited to this. The elastic body 4 may be press-fitted into the outer cylinder 2 while being adhered to the outer peripheral surface of the cylinder 1. Of course it's a good thing. For example, the loose wheels used in automobile four-ring suspensions Like an impact device, an outer cylinder 2 is connected to both ends of a long bar-shaped metal link, and the Then, the elastic body 4 having the structure in which the intermediate member 3 is embedded is adhered to the outer peripheral surface of the inner cylinder 1. , the elastic body 4 may be press-fitted into the outer cylinder 2.

[0017] Furthermore, a second embodiment of the present invention is shown in FIG. The configuration of the second embodiment shown in FIG. 4 is basic. The structure is the same as that of the first embodiment, and parts that perform the same functions are given the same reference numerals. do. However, the intermediate member 3 according to the second embodiment is a cylindrical fiber reinforcement made of canvas. a reinforcing layer 34; a cylindrical rubber material 35 bonded to the inner and outer surfaces of the fiber reinforcing layer 34; It consists of This intermediate member 3 shown in FIG. 4 is provided with a fiber reinforcement layer 34. Therefore, the rigidity is higher than that of the rubber material forming the elastic body 4.

[0018] In the second embodiment, as in the case of the first embodiment, a large number of split molds are arranged in a radial direction. Using a swaging device placed in the direction of the and move the split mold in the radial direction in the centripetal direction. , the entire circumferential wall of the outer cylinder 2 is strongly compressed by the tip of each split mold to narrow and reduce the diameter, and the outer elastic body 4 2 is uniformly pre-compressed. Moreover, compared to the conventional method where the intermediate member is made of metal cylinder, The fiber reinforcing layer 34 and the rubber material 35 constituting the intermediate member 3 are reduced in diameter almost uniformly. As in the first embodiment, the inner elastic body 41 is also pre-compressed almost uniformly.

[0019] Furthermore, in the second embodiment as well, the fiber reinforced layer 34 of the intermediate member 3 is different from the conventional metal tube. Since the diameter is reduced almost uniformly, local stress concentration near the intermediate member 3 is avoided. It is advantageous for In addition, in the second embodiment as well, a highly rigid Since the intermediate member 3 is provided, the spring constant K3 in the direction perpendicular to the axis is set higher. This has the advantage of increasing the value of (K3/K4).

[0020] Further, FIG. 5 shows an intermediate member 3 used in a third embodiment of the present invention. The third fruit shown in Figure 5 The configuration of this embodiment is basically the same as that of the first embodiment. However, in the third embodiment The intermediate member 3 is a plurality of intermediate members arranged in the circumferential direction and extending substantially parallel to the axial direction of the inner cylinder 1. Each wire cord 38 is tied to a steel wire cord 38 as a reinforcing wire. It is made of a cylindrical rubber material 39. This intermediate member 3 shown in FIG. Since the cord 38 is provided, this intermediate member 3 is made of rubber that constitutes the elastic body 4. More rigid than other materials.

[0021] In the third embodiment, as in the case of the first embodiment, the swaging device is The molds are moved radially and centripetally, and the tip of each split mold covers the entire peripheral wall of the outer cylinder 2. The outer elastic body 42 is uniformly pre-compressed by applying strong pressure and narrowing to reduce the diameter. In the third example Even if the intermediate member 3 is made of a metal tube, the wire constituting the intermediate member 3 is Since the diameter of the yarn cord 38 and the cylindrical rubber material 39 is reduced almost uniformly, the first embodiment Similarly, the inner elastic body 41 is also precompressed almost uniformly. In addition, in the third embodiment However, since the highly rigid intermediate member 3 with the wire cord 38 is provided, the axial The advantage is that the spring constant in the angular direction can be made higher than K3, and the value of (K3/K4) can be increased. Has a point.

[0022] In addition, in each of the above-mentioned embodiments, the present invention is applied to a rubber bushing. In short, it has an inner cylinder, an outer cylinder, an intermediate member, an elastic body, and the outer cylinder Pre-compression is applied to the elastic body in the radial direction by at least one of reducing the diameter of the inner cylinder and expanding the diameter of the inner cylinder. Any material that can be provided is fine, such as member mount, strut mount, etc. It can also be applied to anti-vibration rubber. (Application example) The rubber bushing of each embodiment is, for example, an A-type control valve of an automobile suspension system. It can be installed at the vehicle body connection part of the system. In this case, the axis of the rubber bushing should be and so that the direction perpendicular to the axis of the rubber bushing is in the vehicle width direction. child This makes it possible to suppress harshness while maintaining steering stability.

[0023]

[Effect of the idea]

According to the cylindrical vibration isolating rubber according to claims 1 to 3, the diameter of the outer cylinder is reduced and the diameter of the inner cylinder is expanded. If at least one is done, the degree of precompression of the elastic body in the radial direction is equal to that in the circumferential direction. to equalize it. Therefore, it is advantageous to improve the durability and life of the elastic body. Furthermore, intermediate The member is almost uniformly shaped compared to the conventional intermediate member 300 made of a metal cylinder shown in FIG. Because the diameter is reduced or expanded, it is advantageous to avoid local stress concentration near intermediate members. In this sense as well, the durability and life of the elastic body can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a rubber bushing of a first embodiment.

FIG. 2 is a sectional view taken along line W-W in FIG. 1.

FIG. 3 is a cross-sectional view of a conventional rubber bushing.

FIG. 4 is a longitudinal sectional view of a rubber bushing of a second embodiment.

FIG. 5 is a perspective view of an intermediate member used in the rubber bushing of the third embodiment.

[Explanation of symbols]

In the figure, 1 is an inner cylinder, 2 is an outer cylinder, 3 is an intermediate member, and 4 is an elastic body.

Claims (3)

[Scope of utility model registration request] 1. An inner cylinder, an outer cylinder disposed on the outer peripheral side of the inner cylinder, a cylindrical intermediate member interposed between the inner cylinder and the outer cylinder, and the intermediate member and the inner cylinder. and a cylindrical elastic body made of a rubber material interposed between the intermediate member and the outer cylinder, and the elastic body is consists of pre-compression in the radial direction,
A cylindrical anti-vibration rubber characterized in that the intermediate member is made of a rubber material having higher rigidity than the rubber material constituting the elastic body. 2. An inner cylinder, an outer cylinder disposed on the outer peripheral side of the inner cylinder, a cylindrical intermediate member interposed between the inner cylinder and the outer cylinder, and the intermediate member and the inner cylinder. and a cylindrical elastic body made of a rubber material interposed between the intermediate member and the outer cylinder, and the elastic body is consists of pre-compression in the radial direction,
The intermediate member is composed of a cylindrical fiber-reinforced layer having higher rigidity than the rubber material constituting the elastic body, and a rubber material bonded to the fiber-reinforced layer. Shaking rubber. 3. An inner cylinder, an outer cylinder disposed on the outer peripheral side of the inner cylinder, a cylindrical intermediate member interposed between the inner cylinder and the outer cylinder, and the intermediate member and the inner cylinder. and a cylindrical elastic body made of a rubber material interposed between the intermediate member and the outer cylinder, and the elastic body is consists of pre-compression in the radial direction,
The intermediate member is composed of a large number of reinforcing wires arranged in the circumferential direction and extending substantially parallel to the axial direction of the inner cylinder, and a flexible binding material that binds each of the reinforcing wires into a cylindrical shape. A cylindrical anti-vibration rubber characterized by: