JP2005207481A - Cylinder type liquid sealed vibration damping apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder type liquid sealed vibration damping apparatus which is excellent in the durability and has a long life. <P>SOLUTION: A first rubber-like elastic member 3 is arranged between a first inner cylinder 1 and an intermediate cylinder 2. A second rubber-like elastic member 5 is arranged between the intermediate cylinder 2 and an outer cylinder 4. A pair of liquid chambers 6, the wall of which is the second rubber-like elastic member 5, is formed between the intermediate cylinder 2 and the outer cylinder 4 so as to be positioned on the opposite sides of the intermediate cylinder 2. Further, orifices 7 are formed so as to connect a pair of the liquid chambers 6 with each other. The first inner cylinder 1 is made of steel, and the diameter of the first inner cylinder 1 has been expanded by press-fitting a second inner cylinder 8 into the first inner cylinder 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylindrical liquid-filled vibration isolator.

  The cylindrical liquid-filled vibration isolator is provided, for example, between a suspension member and a lower arm of an automobile. Then, the inner cylinder and the outer cylinder are relatively displaced by the input of vibration, the rubber-like elastic body is elastically deformed, and the volumes of both liquid chambers change. Thereby, the liquid flows through the orifice, and an excellent vibration damping effect is obtained by the liquid flow effect.

Conventionally, the above-described cylindrical liquid-filled vibration isolator includes a pair of liquid chambers in which a rubber-like elastic body is interposed between an inner cylinder and an outer cylinder, and the rubber-like elastic body serves as a chamber wall, and the pair of liquids The chamber is formed by forming an orifice that communicates the chambers (see Patent Document 1).
JP 2003-83389 A

  According to the above-described conventional configuration, since the rubber-like elastic body portion serving as the chamber wall of the liquid chamber extends over the inner cylinder and the outer cylinder, the rubber-like elastic body portion is inclined by an inclination angle between the inner cylinder and the outer cylinder (with respect to the inner cylinder). When the outer cylinder is tilted to the maximum with respect to the inner cylinder, the area near the base of the rubber-like elastic part to be compressed is refracted. Then there was a crack.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a cylindrical liquid-filled vibration isolator having excellent durability and long life.

  A feature of the present invention is that a first rubber-like elastic body is interposed between the first inner cylinder and the intermediate cylinder, and a second rubber-like elastic body is interposed between the intermediate cylinder and the outer cylinder. A pair of liquid chambers, each having an elastic body as a chamber wall, are formed between the intermediate cylinder and the outer cylinder in a state of being sandwiched between the intermediate cylinders, and an orifice for connecting the pair of liquid chambers to each other is formed. The first inner cylinder is made of iron, and the second inner cylinder is press-fitted into the first inner cylinder to expand the diameter of the first inner cylinder.

  According to this configuration, the first and second inner cylinders and the outer cylinder are relatively displaced by the input of vibration, and the intermediate cylinder and the outer cylinder are relatively displaced, whereby the first rubber-like elastic body and the second rubber-like elastic body. Is elastically deformed. Then, the volume of the pair of liquid chambers is changed, and the liquid flows through the orifice to attenuate the vibration.

  When the outer cylinder is inclined with respect to the first and second inner cylinders by the elastic deformation described above, the second rubber-like elastic body part forming the chamber wall of the liquid chamber is inclined by the inclination angle between the intermediate cylinder and the outer cylinder (the It receives a tensile force / compressive force corresponding to the inclination angle of the tube). Since the maximum value of the inclination angle is smaller than the maximum value of the inclination angle between the first and second inner cylinders and the outer cylinder (the inclination angle of the outer cylinder with respect to the first and second inner cylinders), the second rubber-like elasticity The tensile force and compressive force applied to the body part can be reduced.

  Since the first inner cylinder is made of iron and the second inner cylinder is press-fitted into the first inner cylinder to expand the diameter of the first inner cylinder, the first rubber-like elastic body is compressed in the radial direction. Thus, the durability of the first rubber-like elastic body can be improved. If the first inner cylinder is made of resin, it becomes weak against heat, the strength is lowered, and it is weak against salt, and the durability tends to decrease. Since it is made of iron, these problems can be solved.

  In the present invention, when the first rubber-like elastic body is set shorter than the liquid chamber in the axial direction and disposed at a position corresponding to the center of the liquid chamber, the intermediate cylinder is inclined with respect to the inner cylinder. The load applied to the second rubber-like elastic body can be reduced, and the intermediate cylinder can be easily inclined in both the forward and reverse directions with respect to the first and second inner cylinders.

  When the first inner cylinder is formed thinner than the intermediate cylinder, the first inner cylinder can be easily expanded in diameter by the second inner cylinder.

  According to the present invention, a cylindrical liquid-filled vibration isolator capable of improving the durability of the first rubber-like elastic body, the second rubber-like elastic body, and the first inner cylinder and extending the life thereof. Could be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, of a pair of front and rear vibration isolator provided between a front suspension member and a lower arm (both not shown) of the automobile, a rear vertical type cylindrical liquid-filled vibration isolator Is shown.

  In this cylindrical liquid-filled vibration isolator, a first rubber-like elastic body 3 is interposed between the first inner cylinder 1 and the intermediate cylinder 2, and a second rubber-like elastic body is interposed between the intermediate cylinder 2 and the outer cylinder 4. A pair of liquid chambers 6 having the second rubber-like elastic body 5 as a chamber wall are formed between the intermediate cylinder 2 and the outer cylinder 4 in a state of being sandwiched between the intermediate cylinders 2 and a pair of The first inner cylinder 1 is formed by forming an orifice 7 that connects the liquid chambers 6 in communication, the first inner cylinder 1 is made of iron, and the second inner cylinder 8 made of iron is press-fitted into the first inner cylinder 1. The diameter is increased.

  The second rubber-like elastic body 5 is vulcanized and formed over the intermediate cylinder 2 and the fitting cylinder 9 with respect to the outer cylinder 4. The fitting cylinder 9 is fitted in the outer cylinder 4. The first inner cylinder 1, the intermediate cylinder 2, the fitting cylinder 9 and the outer cylinder 4 are all cylinders, and the lengths are increased in this order. The second inner cylinder 8 is formed in a slightly thicker cylinder than the outer cylinder 4, and the first inner cylinder 1 is formed thinner than the intermediate cylinder 2. The axial center of the first inner cylinder 1, the second inner cylinder 8, the intermediate cylinder 2, the fitting cylinder 9 and the outer cylinder 4 is located at the same position, and the center of the pair of liquid chambers 6 in the axial direction is also each cylinder. It is located at the same position as the axial center of 1, 8, 2, 9, and 4.

  The fitting cylinder 9 is positioned between the pair of circular ring portions 10 and 20 that are spaced apart in the axial direction of the inner and outer tubes 1, 8, and 2, and the intermediate tube 2, and the pair of circular ring portions 10 and 20 And a pair of connecting walls 11 and 21 having an arc shape in cross section.

  The second rubber-like elastic body 5 is vulcanized and bonded to the pair of circular ring portions 10 and 20 and the inner peripheral surfaces of the pair of connecting walls 11 and 21. Of the second rubber-like elastic body 5, the second rubber-like elastic body portion between one circular ring portion 10 and the intermediate cylinder 2 constitutes an end wall 12 of the liquid chamber 6, and the other circular ring portion 20. And the second rubber-like elastic body portion between the intermediate cylinder 2 constitutes another end wall 13 of the liquid chamber 6, and the second rubber-like elastic body portion between the connecting walls 11, 21 and the intermediate cylinder 2 is inside and outside. A wall portion 14 of the liquid chamber 6 in the circumferential direction of the cylinders 1 and 2 is configured. The end walls 12 and 13 are formed in a circular cross section that is convex in the axial direction toward the center of the liquid chamber, and the connection end portions of the end walls 12 and 13 with respect to the intermediate cylinder 2 are connected to the circular ring portions 10 and 20. It arrange | positions in the center side of the liquid chamber in the said axial direction rather than an edge part.

  The pair of connecting walls 11 and 21 are located on the radially inner side of the pair of circular ring portions 10 and 20. Then, both end portions 16C of the semicircular ring-shaped first orifice forming member 16 are overlapped with the outer peripheral surfaces of the pair of connecting walls 11 and 21, and both end portions 18C of the semicircular ring-shaped second orifice forming member 18 are paired with each other. The connecting walls 11 and 21 are overlapped on the outer peripheral surface. Also, the first orifice forming member 16 and the second orifice forming member 18 have one end portions 16C and 18C butting each other in the circumferential direction and the other end portions 16C and 18C butting in the circumferential direction.

  The first orifice forming member 16 and the second orifice forming member 18 are provided with orifice forming grooves 22 and 24 communicating with each other on the outer peripheral portion, respectively, and one end of these orifice forming grooves 22 and 24 is provided in each liquid chamber 6. It is open. Reference numerals 23 and 25 denote openings.

  A stopper 19 made of a second rubber-like elastic body portion having an arcuate cross section protruding from the intermediate cylinder 2 side toward the inner peripheral surface side of the first or second orifice forming member 16, 18 is provided in the liquid chamber 6. is there. In addition, the first rubber-like elastic body 3 is set shorter than the liquid chamber 6 in the axial direction and arranged at a position corresponding to the center of the liquid chamber 6, and the center of the first rubber-like elastic body 3 and the liquid are arranged in the axial direction. The center of the chamber 6 is located at the same position.

  Both ends of the outer cylinder 4 in the axial direction are bent inward in the radial direction to prevent relative movement in the axial direction between the outer cylinder 4 and the fitting cylinder 9.

Plan view of cylindrical liquid-filled vibration isolator AA sectional view of FIG. BB sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st inner cylinder 2 Intermediate | middle cylinder 3 1st rubber-like elastic body 4 Outer cylinder 5 2nd rubber-like elastic body 6 Liquid chamber 7 Orifice 8 2nd inner cylinder

Claims (3)

  A first rubber-like elastic body is interposed between the first inner cylinder and the intermediate cylinder, a second rubber-like elastic body is interposed between the intermediate cylinder and the outer cylinder, and the second rubber-like elastic body is connected to the chamber wall. A pair of liquid chambers are formed between the intermediate cylinder and the outer cylinder in a state of being sandwiched between the intermediate cylinders, and an orifice is formed to connect the pair of liquid chambers in communication with each other. Is a cylindrical liquid-filled vibration isolator in which the second inner cylinder is press-fitted into the first inner cylinder to expand the diameter of the first inner cylinder.   2. The cylindrical liquid-filled vibration isolator according to claim 1, wherein the first rubber-like elastic body is set shorter than the liquid chamber in an axial direction and disposed at a position corresponding to the center of the liquid chamber.   The cylindrical liquid-filled vibration isolator according to claim 1 or 2, wherein the first inner cylinder is formed thinner than the intermediate cylinder.

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