JP2006329394A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of sufficiently exercising vibration control performance with respect to vibration with small amplitude while being a structure capable of avoiding deterioration of durability of a pair of rubbery elastic bodies. <P>SOLUTION: The vibration control device is provided with an inner tube 1, an outer tube 2, the pair of rubbery elastic bodies 3, a first cavity part 4, a second cavity part 5, a first stopper rubber 6, and a second stopper rubber 7. The first stopper rubber 6 is comprised of a first stopper part 11, and a pair of second stopper parts 12. An overall length L1 of the first stopper part 11 is set longer than a protruding amount T1 of the first stopper part 11, and a stopper face 11A of the first stopper part 11 is formed like an arced shape hugging an outer circumferential face 1A of the inner tube 1. A protruding amount T2 of the second stopper part 12 is set longer than the protruding amount T1 of the first stopper part 11, and the overall length L1 of the first stopper part 11 is set longer than an overall length L2 of the second stopper part 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention
An inner cylinder,
An outer cylinder,
A pair of rubber-like elastic bodies positioned between the inner cylinder and connecting the inner cylinder and the outer cylinder;
A first cavity portion and a second cavity portion formed between the inner cylinder and the outer cylinder, and positioned between the inner cylinder and a pair of rubber-like elastic bodies;
A first stopper rubber formed in the first cavity,
A second stopper rubber formed in the second cavity,
The first stopper rubber protrudes from the thin rubber film vulcanized and formed on the inner peripheral surface of the outer cylinder toward the inner cylinder side, and the second stopper rubber is added to the inner peripheral surface of the outer cylinder. The present invention relates to an anti-vibration device that protrudes toward the inner cylinder from a thin rubber film formed by sulfur molding.

  The above-described vibration isolator is interposed, for example, between a lower arm that supports a vehicle wheel and a vehicle body member. The first cavity portion and the second cavity portion are arranged in the front-rear direction of the automobile, thereby reducing the spring constant in the front-rear direction and improving the ride comfort. The first stopper rubber and the second stopper rubber prevent an excessive relative displacement in the front-rear direction of the inner cylinder and the outer cylinder to prevent a decrease in durability of the pair of rubber-like elastic bodies.

  Conventionally, in this type of vibration isolator, as shown in FIG. 8, the first stopper rubber 6 and the second stopper rubber 7 are solidly formed, and in the direction perpendicular to the axis O of the inner cylinder 1. In the cross section (transverse cross section), the stopper surface 6A of the first stopper rubber 6 and the stopper surface 7A of the second stopper rubber 7 are respectively formed into arcuate surfaces that gently curve, and the first stopper rubber 6 and the second stopper rubber are formed. The volume of rubber 7 was large. In FIG. 8, 2 is an outer cylinder, 3 is a rubber-like elastic body, 4 is a first cavity, 5 is a second cavity, and 8 is a hollow hole of the inner cylinder 1.

  According to the above conventional structure, since the volume of the first stopper rubber and the second stopper rubber is large, vibration with a small amplitude is input and the inner cylinder repeats collision and separation with the first stopper rubber and the second stopper rubber. The dynamic spring constant at that time was high, and the anti-vibration characteristics against vibration with a small amplitude were likely to be insufficient. To reduce the dynamic spring constant, the width of the first stopper rubber (the width of the first stopper rubber in the circumferential direction of the outer cylinder) and the width of the second stopper rubber (the width of the second stopper rubber in the circumferential direction of the outer cylinder) are reduced. As a result, excessive relative displacement between the inner cylinder and the outer cylinder cannot be prevented, leading to a decrease in durability of the rubber-like elastic body.

  The present invention has been made in view of the above circumstances, and its purpose is to sufficiently exhibit vibration-proof characteristics against vibrations having small amplitudes while being capable of avoiding a decrease in durability of a pair of rubber-like elastic bodies. It is in providing a vibration isolator.

The feature of the present invention is that
An inner cylinder,
An outer cylinder,
A pair of rubber-like elastic bodies positioned between the inner cylinder and connecting the inner cylinder and the outer cylinder;
A first cavity portion and a second cavity portion formed between the inner cylinder and the outer cylinder, and positioned between the inner cylinder and a pair of rubber-like elastic bodies;
A first stopper rubber formed in the first cavity,
A second stopper rubber formed in the second cavity,
The first stopper rubber protrudes from the thin rubber film vulcanized and formed on the inner peripheral surface of the outer cylinder toward the inner cylinder side, and the second stopper rubber is added to the inner peripheral surface of the outer cylinder. A vibration isolator that protrudes toward the inner cylinder from a thin rubber film molded by sulfur,
The first stopper rubber is
A first stopper portion protruding toward the hollow hole of the inner cylinder;
It consists of a pair of second stopper portions that are located across the first stopper portion in the circumferential direction of the outer cylinder and project toward the hollow hole of the inner cylinder,
The pair of second stopper portions are located away from the first stopper portion in the circumferential direction,
The total length of the first stopper portion in the circumferential direction is set longer than the protruding amount of the first stopper portion from the rubber film, and the stopper surface of the first stopper portion is an arc shape along the outer peripheral surface of the inner cylinder. Formed into
The amount of protrusion of the second stopper portion from the rubber film is set longer than the amount of protrusion of the first stopper portion from the rubber film,
The total length of the first stopper portion in the circumferential direction is set longer than the total length of the second stopper portion in the circumferential direction.

  According to this configuration, since the first stopper rubber is composed of the first stopper portion and the pair of second stopper portions, when a vibration having an amplitude less than a predetermined value is input, only the pair of second stopper portions is used. The tube can be received to absorb vibrations. Accordingly, for example, the first stopper rubber is easily elastically deformed as compared with a structure in which a space between adjacent ones of the first stopper portion and the pair of second stopper portions is filled with a rubber material. The dynamic spring constant can be reduced without reducing the width of the spring. Since the pair of second stopper portions protrude from the rubber film toward the hollow hole side of the inner cylinder, the pair of second stopper portions are compressed from the inner and outer cylinders when vibration having an amplitude of a predetermined value or more is input. It becomes difficult to buckle against force, and can sufficiently resist a large compressive force. The first stopper portion protrudes toward the hollow hole of the inner cylinder, and the total length of the first stopper portion in the circumferential direction is set to be longer than the protruding amount of the first stopper portion from the rubber film. The stopper surface is formed in an arc shape along the outer peripheral surface of the inner cylinder, and the protrusion amount of the first stopper portion from the rubber film is set shorter than the protrusion amount of the second stopper portion from the rubber film, and the circumferential direction Since the total length of the first stopper portion is set to be longer than the total length of the second stopper portion in the circumferential direction, the first stopper portion can sufficiently resist the compression force. As a result, when a vibration having a large amplitude of a predetermined value or more is input, the inner cylinder can be stably received by the first stopper portion and the pair of second stopper portions. That is, the spring force of the first stopper rubber as a stopper spring that prevents excessive relative displacement of the inner and outer cylinders is increased, and a satisfactory stopper action can be achieved.

In the present invention,
The first cavity portion and the second cavity portion penetrate in the axial direction of the inner and outer cylinders, and when the center of the first stopper portion in the circumferential direction is located at the center in the circumferential direction of the first cavity portion, The inner cylinder coming toward the one stopper portion side is received by the first stopper portion and also received by the pair of second stopper portions on both outer sides of the first stopper portion. Thereby, an inner cylinder can be stably received with a 1st stopper part and a pair of 2nd stopper part.

In the present invention,
If the second stopper rubber is formed so that the length in the circumferential direction is shorter toward the radially inner side of the outer cylinder, the inner cylinder can be stably received by the second stopper rubber. .

According to the present invention,
It was possible to provide a vibration isolator capable of sufficiently exhibiting the vibration isolating characteristics against vibration with a small amplitude while having a structure capable of avoiding a decrease in durability of the pair of rubber-like elastic bodies.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
1 to 3 show a cylindrical vibration isolator 100 interposed between a lower arm that supports a vehicle wheel and a vehicle body member. The vibration isolator 100 includes an inner cylinder 1, an outer cylinder 2, a pair of rubber-like elastic bodies 3 and 3 that connect the inner cylinder 1 and the outer cylinder 2, and the inner cylinder 1. Formed between the inner cylinder 1 and the outer cylinder 2, and is formed in the first cavity part 4, the second cavity part 5, and the first cavity part 4 located between the pair of rubber-like elastic bodies 3 and 3, A first stopper rubber 6 projecting toward the inner cylinder 1 from a thin rubber film 15 vulcanized and formed on the inner peripheral surface 2C of the outer cylinder 2 and a second cavity 5 are formed from the rubber film 15. And a second stopper rubber 7 protruding toward the inner cylinder 1 side. The inner and outer cylinders 1 and 2 are both made of metal, and the inner cylinder 1 is formed in a thick, non-circular cylindrical shape, and the outer cylinder 2 is formed in a thin cylindrical shape. The rubber film 15 is formed to have a uniform thickness over the entire inner peripheral surface 2C of the outer cylinder 2. Since the first stopper rubber 6 and the second stopper rubber 7 protrude from the rubber film 15, for example, the first stopper rubber 6 and the second stopper rubber 7 are compared with the structure in which the first stopper rubber 6 and the second stopper rubber 7 protrude from the inner peripheral surface 2 </ b> C of the outer cylinder 2. The base of the 1 stopper rubber 6 and the 2nd stopper rubber 7 is hard to be cracked.

  The first cavity 4 and the second cavity 5 penetrate the inner and outer cylinders 1 and 2 in the axial direction J. The first cavity portion 4 and the second cavity portion 5 are arranged in the front-rear direction Z of the automobile, thereby reducing the spring constant in the front-rear direction Z and improving the ride comfort of the automobile. The first cavity 4 and the first stopper rubber 6 are located on the front side in the front-rear direction, and the second cavity 5 and the second stopper rubber 7 are located on the rear side in the front-rear direction. The first stopper rubber 6 and the second stopper rubber 7 prevent the relative displacement of the inner cylinder 1 and the outer cylinder 2 in the front-rear direction Z, thereby reducing the durability of the pair of rubber-like elastic bodies 3 and 3. To prevent. The pair of rubber-like elastic bodies 3 and 3, the rubber film 15, the first stopper rubber 6 and the second stopper rubber 7 are vulcanized and molded by the same rubber compound. Although the 1st cavity part 4 and the 2nd cavity part 5 are shape | molded using the core, you may cut out and form after vulcanization molding.

  As shown in FIGS. 1 and 5, the first stopper rubber 6 includes a first stopper portion 11 that protrudes toward the axis O of the inner cylinder 1 (the axis O of the hollow hole 8 of the inner cylinder 1), and an outer A pair of second stopper portions 12 that are positioned with the first stopper portion 11 sandwiched in the circumferential direction S of the cylinder 2 and project toward the axis O of the inner cylinder 1 (the axis O of the hollow hole 8 of the inner cylinder 1). , 12. In the circumferential direction S, the pair of second stopper portions 12 and 12 are positioned away from the first stopper portion 11. The central portion 9 (that is, the center 9) of the first stopper portion 11 in the circumferential direction S is located at the central portion 19 (that is, the center 19) of the first cavity portion 4 in the circumferential direction S. The total length L1 of the first stopper portion 11 in the circumferential direction S is set to be longer than the protruding amount T1 of the first stopper portion 11 from the rubber film 15, and the stopper surface 11A of the first stopper portion 11 is the outer periphery of the inner cylinder 1. It is formed in an arcuate curved surface along the surface 1A. The protrusion amount T2 of the second stopper portion 12 from the rubber film 15 is set to be longer than the protrusion amount T1 of the first stopper portion 11 from the rubber film 15, and the total length L1 of the first stopper portion 11 in the circumferential direction S is The length is set to be longer than the total length L2 of the second stopper portion 12 in the circumferential direction S.

  As shown in FIGS. 2 and 6, in a longitudinal section (a section along the axial direction of the inner and outer tubes 1 and 2), the first stopper portion 11 and the second stopper portion 12 are spread toward the outer tube 2 side. As shown in FIGS. 1 and 5, the second stopper portion 12 is set in a tapered shape in a transverse section (a section in the direction perpendicular to the axis of the inner and outer cylinders 1 and 2). Yes. 12A is a stopper surface of the second stopper portion 12. This stopper surface 12A is formed in the inclined surface located in the inner peripheral surface 2C side of the outer cylinder 2, so that the side farther from the 1st stopper part 11 in the said circumferential direction S is.

  The second stopper rubber 7 is formed so that the length d in the circumferential direction S becomes shorter toward the radially inner side K2 of the outer cylinder 2. As shown in FIG. 2, the stopper surface 7A of the second stopper rubber 7 is located closer to the inner cylinder 1 side in the axial direction J center side of the inner and outer cylinders 1 and 2 (inward of the second stopper rubber 7 in the axial direction J). It is formed on a tapered surface (located closer to the inner cylinder 1 side). As shown in FIG. 4, the second stopper rubber 7 is formed with a pair of through holes 14 and 14 (corresponding to the pair of holes 14 and 14) along the axial direction J of the inner and outer cylinders 1 and 2. When the vibration with the amplitude of 1 is input, each through hole 14 is crushed in the radial direction and the inner peripheral surface 14A of the through hole 14 is in close contact. The through hole 14 is formed as a tapered hole having a smaller diameter toward the center side in the axial direction J of the inner and outer cylinders 1 and 2 (smaller diameter toward the inner side of the second stopper rubber 7 in the axial direction J). The pair of through-holes 14 and 14 are formed using a core in the same manner as the first cavity portion 4 and the second cavity portion 5, but may be formed by hollowing out after vulcanization molding.

  With the above structure, when vibration with an amplitude less than a predetermined value is input, the first stopper rubber 6 receives the inner cylinder 1 with only the pair of second stopper portions 12 and 12 and absorbs the vibration. When vibration having an amplitude greater than or equal to a predetermined value is input, the first stopper rubber 6 receives the inner cylinder 1 with the first stopper portion 11 and the pair of second stopper portions 12 and 12.

[Another embodiment]
The hole 14 may be a hole with a bottom. The number of holes 14 may be only one, or may be three or more. The first cavity 4 and the first stopper rubber 6 may be located on the rear side in the front-rear direction, and the second cavity 5 and the second stopper rubber 7 may be located on the front side in the front-rear direction.

Plan view of vibration isolator AA sectional view of FIG. BB sectional view of FIG. CC sectional view of FIG. Enlarged view of the first stopper rubber EE sectional view of FIG. DD sectional view of FIG. Plan view of conventional vibration isolator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner cylinder 1A Inner cylinder outer peripheral surface 2 Outer cylinder 2C Outer cylinder inner peripheral surface 3 Rubber-like elastic body 4 First cavity part 5 Second cavity part 6 First stopper rubber 7 Second stopper rubber 8 Hollow hole 9 Circumferential direction 1st stopper part 11A 1st stopper part 11A First stopper part stopper surface 12 Second stopper part 15 Rubber film 19 Center 100 in the circumferential direction of the first cavity part Vibration isolator d Length in the circumferential direction (circumference Length of the second stopper rubber in the direction)
J Axial direction of inner and outer cylinders K2 Radial inner side L1 of outer cylinder L1 Total length of first stopper part L2 Total length of second stopper part S Circumferential direction T1 of outer cylinder T2 Protrusion amount of first stopper part T2 Protrusion of second stopper part amount

Claims (3)

An inner cylinder,
An outer cylinder,
A pair of rubber-like elastic bodies positioned between the inner cylinder and connecting the inner cylinder and the outer cylinder;
A first cavity portion and a second cavity portion formed between the inner cylinder and the outer cylinder, and positioned between the inner cylinder and a pair of rubber-like elastic bodies;
A first stopper rubber formed in the first cavity,
A second stopper rubber formed in the second cavity,
The first stopper rubber protrudes from the thin rubber film vulcanized and formed on the inner peripheral surface of the outer cylinder toward the inner cylinder side, and the second stopper rubber is added to the inner peripheral surface of the outer cylinder. A vibration isolator that protrudes toward the inner cylinder from a thin rubber film molded by sulfur,
The first stopper rubber is
A first stopper portion protruding toward the hollow hole of the inner cylinder;
It consists of a pair of second stopper portions that are located across the first stopper portion in the circumferential direction of the outer cylinder and project toward the hollow hole of the inner cylinder,
The pair of second stopper portions are located away from the first stopper portion in the circumferential direction,
The total length of the first stopper portion in the circumferential direction is set longer than the protruding amount of the first stopper portion from the rubber film, and the stopper surface of the first stopper portion is an arc shape along the outer peripheral surface of the inner cylinder. Formed into
The amount of protrusion of the second stopper portion from the rubber film is set longer than the amount of protrusion of the first stopper portion from the rubber film,
An anti-vibration device in which an overall length of the first stopper portion in the circumferential direction is set longer than an overall length of the second stopper portion in the circumferential direction.   The first cavity portion and the second cavity portion penetrate in the axial direction of the inner and outer cylinders, and the center of the first stopper portion in the circumferential direction is located at the center in the circumferential direction of the first cavity portion. The vibration isolator as described.   3. The vibration isolator according to claim 1, wherein the second stopper rubber is formed such that a length in the circumferential direction becomes shorter toward a radially inner side of the outer cylinder.

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