JP2006322552A - Vibration-proofing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-proofing device constructed to sufficiently develop small-amplitude vibration-proofing property while avoiding the durability degradation of a pair of rubber elastic bodies. <P>SOLUTION: The vibration-proofing device comprises an inner cylinder 1, an outer cylinder 2, the pair of rubber elastic bodies 3, a first cavity 4 and a second cavity, a first stopper rubber 6 formed in the first cavity 4 and protruded from the side of the outer cylinder 2 to the side of the inner cylinder 1, and a second stopper rubber 7 formed in the second cavity 5 and protruded from the side of the outer cylinder 2 to the side of the inner cylinder 1. The first stopper rubber 6 consists of a first stopper portion 11, a second stopper portion 12 and a third stopper portion 13 arranged side by side at certain spaces P in a peripheral direction S of the outer cylinder 2 and protruded to the inner cylinder 1. <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 outer cylinder side toward the inner cylinder side, and the second stopper rubber relates to a vibration isolator that protrudes from the outer cylinder side toward the inner cylinder side.

  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. 9, 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 on arcuate surfaces that curve gently, and the first stopper rubber 6 and the second stopper rubber are formed. The volume of rubber 7 was large.

  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. If the width of the first stopper rubber (width in the circumferential direction of the outer cylinder) or the width of the second stopper rubber (width in the circumferential direction of the outer cylinder) is reduced in order to reduce the dynamic spring constant, the inner cylinder and the outer cylinder are excessively large. The relative displacement cannot be prevented, and the durability of the rubber-like elastic body is lowered.

  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 outer cylinder side toward the inner cylinder side, and the second stopper rubber protrudes from the outer cylinder side toward the inner cylinder side,
The first stopper rubber is
The outer cylinder is arranged at a certain interval in the circumferential direction of the outer cylinder, and includes a first stopper section, a second stopper section, and a third stopper section that protrude toward the inner cylinder side.

  According to this configuration, since the first stopper rubber includes the first stopper portion, the second stopper portion, and the third stopper portion, for example, next to the first stopper portion, the second stopper portion, and the third stopper portion. Compared to a structure in which the matching material is filled with a rubber material, it becomes easier to elastically deform up to a predetermined amplitude, and the dynamic spring constant can be reduced without reducing the width of the first stopper rubber. . And since the 1st stopper part, the 2nd stopper part, and the 3rd stopper part protrude toward the inner cylinder from the outer cylinder side, when a vibration with a large amplitude is inputted, the first stopper part and the second stopper part The third stopper portion is less likely to buckle against the compressive force from the inner and outer cylinders. As a result, the first stopper portion, the second stopper portion, and the third stopper portion can sufficiently resist a large compressive force, and the inner cylinder is formed by the first stopper portion, the second stopper portion, and the third stopper portion. Can be received stably. 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, the second stopper portion is located at a central portion in the circumferential direction of the first cavity portion, and the first cavity portion in the circumferential direction. When the stopper portion and the third stopper portion are positioned with the second stopper portion sandwiched therebetween, the inner cylinder coming toward the second stopper portion side is received by the second stopper portion, and both the second stopper portions are Receiving by the first and third stopper portions on the outer side. Thereby, an inner cylinder can be stably received by the 1st stopper part, the 2nd stopper part, and the 3rd stopper part.

In the present invention,
When the first stopper portion, the second stopper portion, and the third stopper portion protrude toward the inner cylinder from a thin rubber film vulcanized and formed on the inner peripheral surface of the outer cylinder, The amount of protrusion of the first stopper portion, the second stopper portion, and the third stopper portion can be set large, and the first stopper portion, the second stopper portion, and the third stopper portion are easily elastically deformed up to a predetermined amplitude. .

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. .

In the present invention,
The second stopper portion protrudes toward the hollow hole of the inner cylinder, and the first stopper portion and the third stopper portion are in a direction toward the hollow hole of the inner cylinder and the protruding direction of the second stopper portion. If it protrudes in a direction inclined with respect to, the following effects can be obtained.

  When vibration with a large amplitude is input, the first stopper portion, the second stopper portion, and the third stopper portion are less likely to buckle against the compressive force from the inner and outer cylinders. As a result, the first stopper portion, the second stopper portion, and the third stopper portion can sufficiently resist a large compressive force, and the first stopper portion, the second stopper portion, and the third stopper portion The inner cylinder can be received stably. 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.

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 that are located between the inner cylinder 1 and the inner cylinder 1 and the outer cylinder 2, and the inner cylinder 1 and the outer cylinder 1. Formed between the inner cylinder 1 and the pair of rubber-like elastic bodies 3 between the first cavity part 4 and the second cavity part 5 and the first cavity part 4 formed between the inner cylinder 1 and the outer cylinder 2 side. A first stopper rubber 6 projecting from the outer cylinder 2 toward the inner cylinder 1 side, and a second stopper rubber 7 formed in the second cavity 5 and projecting from the outer cylinder 2 side toward the inner cylinder 1 side are provided. . 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 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 4 is formed in a circular arc shape along the circumferential direction S of the outer cylinder 2 as viewed in the axial direction of the inner and outer cylinders 1 and 2. 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 excessive relative displacement of the inner cylinder 1 and the outer cylinder 2 in the front-rear direction Z, thereby preventing a decrease in durability of the pair of rubber-like elastic bodies 3. . The pair of rubber-like elastic bodies 3, the first stopper rubber 6, and the second stopper rubber 7 are vulcanized with the same rubber compound, and the pair of rubber-like elastic bodies 3 are formed on the outer peripheral surface of the inner cylinder 1 and the outer cylinder 2. The first stopper rubber 6 and the second stopper rubber 7 are vulcanized and bonded to the inner peripheral surface of the outer cylinder 2 on the inner peripheral surface. The first cavity portion 4 and the second cavity portion 5 are molded using a core, but can also be formed by punching after vulcanization molding.

  As shown in FIGS. 1 and 5, the first stopper rubber 6 is arranged with a constant interval P in the circumferential direction S of the outer cylinder 2, and a first stopper portion 11 that protrudes toward the inner cylinder 1 side. It consists of a second stopper portion 12 and a third stopper portion 13. And the 2nd stopper part 12 is located in the center part 9 in the said circumferential direction S of the 1st cavity part 4, and the 1st stopper part 11 and the 3rd stopper part 13 pinch | interpose the 2nd stopper part 12 in the said circumferential direction S Is located at. The first stopper portion 11 and the third stopper portion 13 have the same shape. The first stopper portion 11, the second stopper portion 12, and the third stopper portion 13 protrude from a thin rubber film 15 that is vulcanized and formed on the inner peripheral surface 2C of the outer cylinder 2 over the entire circumference. Specifically, as shown in FIG. 8, the second stopper portion 12 is directed toward the axis O of the inner cylinder 1 (the axis O of the hollow hole 8 of the inner cylinder 1) in the axial direction view of the inner and outer cylinders 1 and 2. The first stopper portion 11 and the third stopper portion 13 protrude so as to be symmetrical with respect to a line N2 connecting the center R2 of the second stopper portion 12 and the axis O of the inner cylinder 1 in the circumferential direction S of the outer cylinder 2. And protrudes toward the point R1 on the line N2. A line N1 connecting the center Q1 of the first stopper portion 11 in the circumferential direction S and the protruding direction and the one point R1, and a line N3 connecting the center Q3 of the third stopper portion 13 in the circumferential direction S and the protruding direction and the one point R1. Is an angle (∠Q1R1Q3) of 55 ° (other numerical values may be used). The one point R1 may be located at the same position as the axis O of the hollow hole 8. As described above, the first stopper portion 11 and the third stopper portion 13 are directions T1 and T3 that are inclined in the direction toward the hollow hole 8 of the inner cylinder 1 and the protruding direction T2 of the second stopper portion 12. Protruding.

  As shown in FIGS. 2 and 6, the first stopper portion 11, the second stopper portion 12, and the third stopper portion 13 are connected to the outer cylinder 2 in a longitudinal section (a section along the axial direction of the inner and outer cylinders 1 and 2). As shown in FIGS. 1 and 5, the first stopper portion 11 and the second stopper are formed in a transverse cross section (a cross section in the direction perpendicular to the axis of the inner and outer cylinders 1 and 2) as shown in FIGS. The top surface (stopper surface) 12A of the second stopper portion 12 is more than the top surface (stopper surface) 11A of the first stopper portion 11 while the portion 12 and the third stopper portion 13 are set in a tapered shape. The width is set to be wider than the top surface (stopper surface) 13A of the third stopper portion 13. More specifically, the second stopper portion 12 is formed in a trapezoidal shape that expands toward the outer cylinder 2 side.

  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 top surface (stopper surface) 7A of the second stopper rubber 7 is positioned closer to the inner cylinder 1 side in the axial direction center side of the inner and outer cylinders 1 and 2 (the second stopper rubber 7 in the axial direction). The inner surface is formed on a tapered surface (located on the inner cylinder 1 side). As shown in FIG. 4, when a pair of through holes 14 (corresponding to hole portions) along the axial direction J of the inner and outer cylinders 1 and 2 are formed in the second stopper rubber 7 and vibrations with a predetermined amplitude or more are input, Each through-hole 14 is crushed in the radial direction so that the inner peripheral surface 14 </ b> A of the through-hole 14 is in close contact. That is, the pair of through-holes 14 are crushed during vibrations with a predetermined amplitude or more and the inner peripheral surface 14A of the through-holes 14 is brought into close contact with each other, so that the second stopper rubber 7 performs a stopper function that regulates the displacement of the inner cylinder 1. It is configured. The through hole 14 is formed as a tapered hole having a smaller diameter toward the axially central side of the inner and outer cylinders 1 and 2 (smaller diameter toward the inner side of the second stopper rubber 7). The pair of through holes 14 are formed using a core in the same manner as the first cavity portion 4 and the second cavity portion 5, but can also be formed by punching after vulcanization molding.

[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 vibration isolator Plan view of conventional vibration isolator

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inner cylinder, 2 ... Outer cylinder, 2C ... Inner peripheral surface of outer cylinder, 3 ... Rubber-like elastic body, 4 ... 1st cavity part, 5 ... 2nd cavity part, 6 ... 1st DESCRIPTION OF SYMBOLS 1 stopper rubber, 7 ... 2nd stopper rubber, 8 ... Hollow hole, 9 ... Center part, 11 ... 1st stopper part, 12 ... 2nd stopper part, 13 ... 3rd stopper part, 14 ... ... hole (through hole), 14A ... inner peripheral surface of hole, 15 ... rubber film, 100 ... vibration isolator, J ... axial direction of inner and outer cylinders, O ... axis of inner cylinder, P …… Spacing, S …… Circumferential direction of the outer cylinder, K2 …… Diameter inner side, D …… Length in the circumferential direction, R2 …… Center of the second stopper portion, N2 …… Center of the second stopper portion A line connecting the axis of the inner cylinder and the axis of the inner cylinder, R1... One point on the line (one point on the line connecting the center of the first stopper part and the axis of the inner cylinder), T2. , T3 ... in the inner cylinder In the direction toward the hole, and a direction inclined with respect to the protruding direction of the second stopper portion

Claims (5)

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 outer cylinder side toward the inner cylinder side, and the second stopper rubber protrudes from the outer cylinder side toward the inner cylinder side,
The first stopper rubber is
An anti-vibration device comprising a first stopper portion, a second stopper portion, and a third stopper portion that are arranged at a certain interval in the circumferential direction of the outer cylinder and project toward the inner cylinder side.   The first cavity portion and the second cavity portion penetrate in the axial direction of the inner and outer cylinders, the second stopper portion is located at a central portion in the circumferential direction of the first cavity portion, and the first cavity portion in the circumferential direction. The vibration isolator according to claim 1, wherein the stopper portion and the third stopper portion are located with the second stopper portion interposed therebetween.   The said 1st stopper part, 2nd stopper part, and 3rd stopper part protrude toward the said inner cylinder from the thin rubber film vulcanized and formed by the inner peripheral surface of the said outer cylinder over the perimeter. Or the vibration isolator of 2.   The anti-vibration device according to any one of claims 1 to 3, wherein the second stopper rubber is formed so that a length in the circumferential direction becomes shorter toward a radially inner side of the outer cylinder.   The second stopper portion protrudes toward the hollow hole of the inner cylinder, and the first stopper portion and the third stopper portion are in a direction toward the hollow hole of the inner cylinder and the protruding direction of the second stopper portion. The vibration isolator as described in any one of Claims 2-4 which protrudes in the direction inclined with respect to.

Images