JP2023023490A - Vibration control bush - Google Patents

Abstract

To achieve reduction of spring rigidity for input vibration acting in a twisting direction.SOLUTION: In a vibration control bush, an expansion part 17 expanding to a radial outer side is formed at a portion which is enclosed from the radial outer side by a slide cylinder 13 on an outer peripheral surface of an inner cylinder 11. The vibration control bush includes: a first elastic body 14 which connects an outer peripheral surface of the expansion part with an inner peripheral surface of the slide cylinder; second elastic bodies 15, making a pair, which respectively connect portions located at both sides sandwiching the expansion part in an axial direction with an inner peripheral surface of an outer cylinder 12 over an entire circumferential length on the outer peripheral surface of the inner cylinder; outer engagement members 18 each of which protrudes from the inner peripheral surface of the outer cylinder to the radial inner side; and inner engagement members 19 each of which is provided at the axial inner side relative to the outer engagement member and protrudes from the outer peripheral surface of the inner cylinder to the radial outer side. Each second elastic body extends to the axial outer side in a direction from the radial inner side toward the outer side, connects the inner engagement member with the outer engagement member in the axial direction, and is spaced apart from the slide cylinder and the expansion part to the axial outer side.SELECTED DRAWING: Figure 1

Description

The present invention relates to an anti-vibration bush.

Conventionally, an inner cylinder connected to either one of a vibration generating part and a vibration receiving part, an outer cylinder connected to the other and surrounding the inner cylinder from the outside in the radial direction, and a sliding element inside the outer cylinder. a sliding cylinder movably fitted to the inner cylinder, the outer peripheral surface of the inner cylinder being formed with a spherical bulging portion that bulges outward in the radial direction; A concave spherical recess is formed in which the bulging portion is slidably fitted, and on both sides of the bulging portion in the axial direction along the central axis of the inner cylinder, on the outer peripheral surface of the inner cylinder. A vibration damping bushing is known that includes a pair of elastic bodies connecting a portion and an inner peripheral surface of an outer cylinder separately over the entire length in the circumferential direction.
In this anti-vibration bushing, when the inner cylinder and the outer cylinder are relatively displaced so that their respective center axes intersect each other, when vibration in the twisting direction is input, the elastic body is elastically deformed, and the outer circumference of the bulging portion is deformed. When the surface slides on the inner peripheral surface of the recessed portion and when axial vibration is input, the elastic body is elastically deformed due to the relative displacement of the inner and outer cylinders, and the sliding cylinder moves to the outer cylinder. sliding on the inner peripheral surface of

JP-A-6-129460

However, the conventional anti-vibration bush has a problem that it is difficult to reduce the spring force against input vibration in a prying direction.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vibration-damping bushing capable of achieving a low spring against input vibration in a prying direction.

In order to solve the above problems and achieve such objects, the vibration isolating bushing of the present invention is an inner cylinder connected to either one of the vibration generating portion and the vibration receiving portion, and to the other. and an outer cylinder surrounding the inner cylinder from the outside in the radial direction; and a sliding cylinder slidably fitted in the outer cylinder. A bulging portion that bulges radially outward is formed in a portion surrounded by the cylinder from the outside in the radial direction, and the outer peripheral surface of the bulging portion and the inner peripheral surface of the sliding cylinder are connected. a first elastic body, portions of the outer peripheral surface of the inner cylinder located on both sides of the bulging portion in the axial direction along the central axis of the inner cylinder, and the inner peripheral surface of the outer cylinder. Separately, a pair of second elastic bodies connected over the entire length in the circumferential direction, an outer locking member protruding radially inward from the inner peripheral surface of the outer cylinder, and an outer locking member extending further in the axial direction than the outer locking member. an inner locking member that is provided on the inner side of the bulging portion along the inner cylinder and protrudes radially outward from the outer peripheral surface of the inner cylinder, wherein the second elastic body extends from the radially inner side Extends outward away from the bulging portion in the axial direction as it goes outward, connects the inner locking member and the outer locking member in the axial direction, and connects the sliding cylinder and the bulging portion. spaced outwardly in said axial direction from the portion.

According to this aspect of the invention, since the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder are connected to the first elastic body and the second elastic body, the inner cylinder and the outer cylinder are arranged so that their central axes are aligned with each other. When a vibration in a twisting direction that causes relative displacement so as to intersect is input, the first elastic body and the second elastic body are elastically deformed. At this time, the pair of second elastic bodies sandwiching the bulging portion in the axial direction extends outward in the axial direction from the inner side in the radial direction toward the outer side, and the inner locking member and the outer locking member extend toward the outer side in the radial direction. are connected in the axial direction, the second elastic body can be shear-deformed against a load in the twisting direction, and the spring can be reduced against input vibration in the twisting direction.
Since the first elastic body connecting the outer peripheral surface of the bulging portion and the inner peripheral surface of the sliding cylinder is provided, when vibration in the radial direction is input, the first elastic body and the second elastic body move. By elastically deforming, the outer cylinder and the inner cylinder are relatively elastically displaced in the radial direction, so that the spring can be easily adjusted against input vibration in the radial direction.
Since the second elastic body is spaced outward in the axial direction from the sliding cylinder and the bulging portion, when axial vibrations and vibrations around the central axis are respectively input, the inner cylinder and the outer cylinder are displaced relative to each other. Accordingly, the sliding cylinder smoothly slides on the inner peripheral surface of the outer cylinder while the second elastic body is elastically deformed.

The second elastic body may be provided in a state in which a compressive force is applied in the axial direction from the inner locking member and the outer locking member.

Since the second elastic body is provided with a compressive force applied in the axial direction, the relative positions of the outer cylinder, the inner cylinder, and the sliding cylinder in the axial direction change before and after the load input. While being able to prevent slippage, the durability of the second elastic body can be ensured.

The outer locking member and the inner locking member may extend inward in the axial direction from the inner side in the radial direction toward the outer side.

Since the outer locking member and the inner locking member extend inward in the axial direction as they go from the inner side in the radial direction to the outer side, the second elastic body is reliably shear-deformed against the load in the prying direction. can be made

At least one of the outer peripheral surface of the sliding cylinder and the inner peripheral surface of the outer cylinder may be formed with a recess for accommodating a lubricant.

At least one of the outer peripheral surface of the sliding cylinder and the inner peripheral surface of the outer cylinder is formed with a containing recess for containing the lubricant. During this period, the lubricant can be retained, and smooth sliding of the sliding cylinder can be maintained for a long period of time.

According to the present invention, it is possible to reduce the spring force against input vibration in the prying direction.

1 is a longitudinal sectional view of an anti-vibration bush shown as one embodiment; FIG. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1;

An embodiment of the anti-vibration bush will be described below with reference to FIGS. 1 and 2. FIG.
The anti-vibration bushing 1 includes an inner cylinder 11 connected to one of the vibration generating portion and the vibration receiving portion, an outer cylinder 12 connected to the other, a sliding cylinder 13, and a first elastic body 14. , a second elastic body 15 , an outer locking member 18 and an inner locking member 19 .

The anti-vibration bush 1 is used, for example, as a suspension bush or engine mount for automobiles, or as a mount for industrial machines installed in factories.
When the anti-vibration bush 1 is used as a suspension bush for an automobile, for example, the inner cylinder 11 is inserted into the inner cylinder 11 while being sandwiched from both sides in the axial direction by brackets (not shown) of suspension members. The inner cylinder 11 is fixed to the bracket using a fastening member (not shown) such as a bolt, and the outer cylinder 12 is press-fitted inside, for example, a mounting holder (not shown) for the link member. 12 is fixed to the holder.

Hereinafter, the direction along the central axis O of the inner cylinder 11 is referred to as the axial direction. Further, in a planar view of the vibration-isolating bushing 1 viewed from the axial direction, the direction intersecting the central axis O is called the radial direction, and the direction rotating around the central axis O is called the circumferential direction.

The axial center portions of the inner cylinder 11, the outer cylinder 12, the sliding cylinder 13, and the first elastic body 14 are aligned with each other. The anti-vibration bushing 1 has a symmetrical shape with respect to a straight line L passing through the central portion in the axial direction when viewed in longitudinal section along one of the axial direction and the radial direction.
Hereinafter, the side closer to the straight line L along the axial direction will be referred to as the inner side in the axial direction, and the side farther from the straight line L along the axial direction will be referred to as the outer side in the axial direction.

The outer cylinder 12 is made of, for example, a metal material. The outer cylinder 12 surrounds the inner cylinder 11 from the outside in the radial direction. The outer cylinder 12 is arranged coaxially with the central axis O. As shown in FIG. At both ends in the axial direction of the inner peripheral surface of the outer cylinder 12, stepped portions 12a facing outward in the axial direction are formed. In the outer cylinder 12, a crimping portion 12b that is bent inward in the radial direction is formed at an edge positioned axially outside the stepped portion 12a. The stepped portion 12a and the crimped portion 12b extend continuously over the entire length in the circumferential direction. The stepped portion 12a and the crimped portion 12b face each other in the axial direction.

The sliding cylinder 13 is slidably fitted in the outer cylinder 12 . The sliding cylinder 13 is made of a low-friction material such as polyacetal. The sliding cylinder 13 is arranged coaxially with the central axis O. As shown in FIG. The sliding cylinder 13 is provided in the axial center of the outer cylinder 12 . At both ends in the axial direction of the inner peripheral surface of the slide cylinder 13, strip-shaped restricting portions 13a are formed separately, protruding radially inward and extending continuously over the entire length in the circumferential direction.

At least one of the outer peripheral surface of the sliding cylinder 13 and the inner peripheral surface of the outer cylinder 12 is formed with an accommodating recess 16 that accommodates a lubricant such as grease. In the illustrated example, the housing recess 16 is formed on the outer peripheral surface of the sliding cylinder 13 . The accommodation recesses 16 are composed of a plurality of strip-shaped grooves, formed over the entire length of the outer peripheral surface of the sliding cylinder 13 in both the axial direction and the circumferential direction, and have a lattice shape when viewed from the outside in the radial direction.
It should be noted that the housing recess 16 may not be provided on the outer peripheral surface of the sliding cylinder 13 and the inner peripheral surface of the outer cylinder 12 .

Both ends of the inner cylinder 11 in the axial direction are positioned axially outside of both ends of the outer cylinder 12 in the axial direction.
On the outer peripheral surface of the inner cylinder 11 , a bulging portion 17 that bulges radially outward is formed in a portion surrounded by the sliding cylinder 13 from the radially outer side. The bulging portion 17 is formed in the axially central portion of the outer peripheral surface of the inner cylinder 11 . The bulging portion 17 has a trapezoidal shape in longitudinal cross-sectional view along one of the axial direction and the radial direction.
In addition, the bulging portion 17 may be formed in a spherical shape, for example. Further, the bulging portion 17 may be formed on the outer peripheral surface of the inner cylinder 11 at a portion axially away from the axially central portion.

On the outer peripheral surface of the inner cylinder 11, stepped portions 11a facing outward in the axial direction are formed at portions located on both sides of the bulging portion 17 in the axial direction. The stepped portion 11a is located axially inside the stepped portion 12a of the outer cylinder 12 . The stepped portion 11a and the bulging portion 17 extend continuously over the entire length in the circumferential direction.

The first elastic body 14 connects the outer peripheral surface of the bulging portion 17 and the inner peripheral surface of the sliding cylinder 13 . The first elastic body 14 connects the inner cylinder 11 and the outer cylinder 12 via the sliding cylinder 13 . The first elastic body 14 is formed in a tubular shape from a rubber material or the like. The first elastic body 14 is arranged coaxially with the central axis O. As shown in FIG. The inner peripheral surface of the first elastic body 14 is adhered to the outer peripheral surface of the bulging portion 17 . The outer peripheral surface of the first elastic body 14 is in pressure contact with the inner peripheral surface of the sliding cylinder 13 . The first elastic body 14 is compressed and deformed in the radial direction. The first elastic body 14 is axially sandwiched between restricting portions 13 a separately formed at both ends of the inner peripheral surface of the sliding cylinder 13 in the axial direction.

A plurality of ribs 14a are formed on the outer peripheral surface of the first elastic body 14 at intervals in the axial direction so as to protrude outward in the radial direction and extend continuously over the entire length in the circumferential direction. The rib 14 a is radially crushed while the first elastic body 14 is fitted in the sliding cylinder 13 .
The ribs 14a may not be formed on the outer peripheral surface of the first elastic body 14.

The second elastic body 15 connects each portion of the outer peripheral surface of the inner cylinder 11 located on both sides sandwiching the bulging portion 17 in the axial direction and the inner peripheral surface of the outer cylinder 12 over the entire circumferential length. are doing. The pair of second elastic bodies 15 are formed in a tubular shape from a rubber material or the like, and extend continuously over the entire length in the circumferential direction. The second elastic body 15 is arranged coaxially with the central axis O. As shown in FIG. The second elastic body 15 is spaced outward in the axial direction from the sliding cylinder 13 , the bulging portion 17 and the first elastic body 14 . The second elastic body 15 may be in contact with the first elastic body 14 in the axial direction.

Here, the outer locking member 18 protrudes radially inward from the inner peripheral surface of the outer cylinder 12 . The inner locking member 19 is provided axially inward of the outer locking member 18 and protrudes radially outward from the outer peripheral surface of the inner cylinder 11 .
The second elastic body 15 extends axially outward from the radially inner side toward the outer side, and axially connects the inner locking member 19 and the outer locking member 18 . The second elastic body 15 is provided with a compressive force applied in the axial direction from the inner locking member 19 and the outer locking member 18 .

In the illustrated example, the outer locking member 18 and the inner locking member 19 are axially opposed to each other. The outer locking member 18 and the inner locking member 19 are formed in an annular shape and arranged coaxially with the central axis O. As shown in FIG. The outer locking member 18 and the inner locking member 19 are formed in a plate shape with front and back surfaces facing the axial direction. The outer locking member 18 and the inner locking member 19 extend axially inward from the radially inner side to the outer side.

Note that the outer locking member 18 and the inner locking member 19 may extend straight in the radial direction. The outer locking member 18 may be formed integrally with the outer cylinder 12 , and the inner locking member 19 may be integrally formed with the inner cylinder 11 . The outer locking member 18 and the inner locking member 19 may be radially separated from each other and not axially opposed to each other.

A radial inner end portion of the outer engaging member 18 is spaced radially outward from the outer peripheral surface of the inner cylinder 11 . A radially outer end portion of the outer locking member 18 extends straight in the radial direction. The caulking portion 12 b of the outer cylinder 12 axially abuts against the outer surface of the outer locking member 18 , which faces outward in the axial direction. An elastically deformable first seal portion 21 is provided on the inner surface facing inward in the axial direction of the radially outer end portion of the outer locking member 18 . The first seal portion 21 is made of a rubber material or the like and formed integrally with the second elastic body 15 . The first seal portion 21 extends continuously over the entire length in the circumferential direction. The first seal portion 21 is in pressure contact with a step portion 12a formed on the inner peripheral surface of the outer cylinder 12 in the axial direction. A radially outer end portion of the outer locking member 18 is axially sandwiched and fixed between the step portion 12 a and the crimp portion 12 b of the outer cylinder 12 .

The radially outer end portion of the inner locking member 19 extends radially inward from the inner peripheral surface of the outer cylinder 12 and axially outward from the sliding cylinder 13 , the bulging portion 17 , and the first elastic body 14 . , apart from each other. A radial inner end portion of the inner locking member 19 extends straight in the radial direction. An elastically deformable second seal portion 22 is provided on the inner surface facing inward in the axial direction of the radially inner end portion of the inner locking member 19 . The second seal portion 22 is made of a rubber material or the like and formed integrally with the second elastic body 15 . The second seal portion 22 extends continuously over the entire length in the circumferential direction. The second seal portion 22 is in pressure contact with a stepped portion 11a formed on the outer peripheral surface of the inner cylinder 11 in the axial direction. The radial inner end portion of the inner locking member 19 extends outward in the axial direction, and the axial end portion of the inner cylinder 11 is fitted to fix the inner locking member 19 to the inner cylinder 11 . A fitting cylinder 19a is formed.

As described above, according to the anti-vibration bushing 1 according to the present embodiment, the outer peripheral surface of the inner cylinder 11 and the inner peripheral surface of the outer cylinder 12 are connected to the first elastic body 14 and the second elastic body 15. Therefore, when the inner cylinder 11 and the outer cylinder 12 are relatively displaced so that their central axes intersect with each other, when vibration in the twisting direction is input, the first elastic body 14 and the second elastic body 15 are elastically deformed. do. At this time, the pair of second elastic bodies 15 axially sandwiching the bulging portion 17 extends axially outward from the radially inner side toward the outer side, and the inner locking member 19 and the outer locking member 18 are connected in the axial direction, it is possible to shear-deform the second elastic body 15 against the load in the twisting direction, and it is possible to reduce the spring against the input vibration in the twisting direction. can.

Since the first elastic body 14 connecting the outer peripheral surface of the bulging portion 17 and the inner peripheral surface of the sliding cylinder 13 is provided, when radial vibration is input, the first elastic body 14 and the first elastic body 14 are connected to each other. 2. Elastic deformation of the elastic body 15 results in relative elastic displacement of the outer cylinder 12 and the inner cylinder 11 in the radial direction, making it possible to easily adjust the spring for input vibration in the radial direction.
Since the second elastic body 15 is spaced outward in the axial direction from the sliding cylinder 13 and the bulging portion 17, when axial vibration and vibration around the central axis O are respectively input, the inner cylinder 11 and As the outer cylinder 12 is relatively displaced, the sliding cylinder 13 smoothly slides on the inner peripheral surface of the outer cylinder 12 while the second elastic body 15 is elastically deformed.

Since the second elastic body 15 is provided in a state in which a compressive force is applied in the axial direction from the inner locking member 19 and the outer locking member 18, the outer cylinder 12, the inner cylinder 11 and the sliding cylinder 13 are elastically deformed. , can be prevented from shifting before and after the load input, and the durability of the second elastic body 15 can be ensured.

Since the outer locking member 18 and the inner locking member 19 extend axially inward from the radially inner side toward the outer side, the second elastic body 15 can be reliably secured against a prying direction load. It can be shear deformed.

At least one of the outer peripheral surface of the sliding cylinder 13 and the inner peripheral surface of the outer cylinder 12 is formed with an accommodating recess 16 for accommodating the lubricant. As a result, it is possible to maintain the smooth sliding of the sliding cylinder 13 for a long period of time.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, the first seal portion 21 and the second seal portion 22 may not be provided on the outer locking member 18 and the inner locking member 19, respectively.
The fitting tube 19a may not be formed on the inner locking member 19.
A recess may be provided on the outer peripheral surface of the first elastic body 14, for example, in a portion facing a direction in which transmission of vibration is desired to be reduced.

In addition, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the scope of the present invention, and the above-described embodiments and modifications may be combined as appropriate.

Reference Signs List 1 anti-vibration bushing 11 inner cylinder 12 outer cylinder 13 sliding cylinder 14 first elastic body 15 second elastic body 16 accommodation recess 17 bulging portion 18 outer locking member 19 inner locking member O central axis

Claims (4)

an inner cylinder connected to one of the vibration generating portion and the vibration receiving portion, and an outer cylinder connected to the other and surrounding the inner cylinder from the outside in the radial direction;
a sliding cylinder slidably fitted in the outer cylinder,
A bulging portion that bulges radially outward is formed in a portion of the outer peripheral surface of the inner cylinder that is surrounded by the sliding cylinder from the radially outer side,
a first elastic body connecting the outer peripheral surface of the bulging portion and the inner peripheral surface of the sliding cylinder;
In the outer peripheral surface of the inner cylinder, each portion located on both sides sandwiching the bulging portion in the axial direction along the central axis of the inner cylinder and the inner peripheral surface of the outer cylinder are separately provided over the entire circumferential length. a pair of connected second elastic bodies;
an outer locking member protruding radially inward from the inner peripheral surface of the outer cylinder;
an inner locking member provided on the inner side of the bulging portion along the axial direction relative to the outer locking member and projecting radially outward from the outer peripheral surface of the inner cylinder,
The second elastic body extends outward from the bulging portion in the axial direction from the radially inner side to the outer side, and connects the inner locking member and the outer locking member in the axial direction. A vibration isolating bushing that is connected and spaced outwardly in the axial direction from the sliding cylinder and the bulging portion. 2. The anti-vibration bushing according to claim 1, wherein said second elastic body is provided in a state in which a compressive force is applied in said axial direction from said inner locking member and said outer locking member. 3. The anti-vibration bushing according to claim 1, wherein said outer locking member and said inner locking member extend inward in said axial direction as they extend from the inner side in the radial direction toward the outer side. 4. The apparatus according to any one of claims 1 to 3, wherein at least one of an outer peripheral surface of said sliding cylinder and an inner peripheral surface of said outer cylinder is formed with an accommodating recess for accommodating a lubricant. Anti-vibration bush.

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