JP2003206970A - Cylindrical vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical vibration control device for implementing measure to suppressing occurrence of abnormal noise at a low cost. <P>SOLUTION: The cylindrical vibration control device comprises: a main shaft member 1; an outer cylinder member 2 coaxially disposed to the outside of the main shaft member 1 at a distance; a rubber elastic body 3 interposed between the main shaft member 1 and the outer cylinder member 2 to integrally connect the main shaft member with the outer cylinder member, and having a pair of bores 31, 32 passing through the rubber elastic body in an axial direction; and an elastic stopper member 4 having a mounting base portion 41 supported by an end of the main shaft member 1, and a circular stopper portion 44 extending from the mounting base portion 41 in an axial direction, inserted in one bore 31, and having a sectional shape in a direction perpendicular to an axis. A projecting portion 45 is disposed to the stopper portion 44 of the elastic stopper member 4 so that the projecting portion extends toward both ends from the central portion in the direction perpendicular to the axis, and gradually and largely projects to an outer circumferential side toward the both ends. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical vibration isolator which is suitable for use as a vehicle diff mount or engine mount.

[0002]

2. Description of the Related Art Conventionally, for example, when a differential is mounted on a vehicle, a cylindrical vibration damping device such as a differential mount for supporting the differential on a vehicle body is used. As such a cylindrical vibration isolator, FIG. 7 and FIG.
As shown in FIG. 3, a main shaft member 5 formed in a cylindrical shape and having an annular stopper 51 fitted in the central portion of the outer peripheral surface thereof, and the main shaft member 5
Of the outer cylinder member 6 arranged substantially coaxially outside the space
And a pair of curls which are interposed between the main shaft member 5 and the outer cylinder member 6 to integrally connect the two, and which are provided on both sides of the main shaft member 5 in the radial main vibration input direction and which penetrate in the axial direction. A rubber elastic body 7 having 71, 72, a mounting base portion 81 held at one end of the main shaft member 5, and an axially extending portion extending from the mounting base portion 81 and inserted into one of the curls 71 of the rubber elastic body 7. An elastic stopper member 8 made of rubber having a stopper portion 84 having a circular arc-shaped cross section in the direction perpendicular to the axis (see FIG. 9).
And FIG. 10. ) Is known to consist of.

In this cylindrical vibration isolator, the main shaft member 5 is connected and fixed to one of the mounting portions of the vehicle body and the differential, and the outer cylindrical member 6 is mounted in the other mounting portion.
It is attached and used by connecting and fixing. In this case, at a position along the main vibration input direction (the differential load input direction) in the radial direction of the tubular vibration damping device,
The rubber elastic body 6 is attached so that the pair of curls 71 and 72 are positioned. Note that the tubular vibration-damping device shown in FIGS. 7 and 8 is mounted such that the main vibration input direction is the vertical direction in the drawings, and the differential load is applied to the main shaft member 5. .

When a vibration is input to the cylindrical vibration isolator, the rubber elastic body 7 interposed between the main shaft member 5 and the outer cylinder member 6 is elastically deformed, so that the vibration is effectively generated. Attenuated. At this time, since the rubber elastic body 7 is provided with the pair of curls 71 and 72, the compressive strain and the tensile strain of the rubber elastic body 7 are alleviated, whereby the durability of the rubber elastic body 7 is improved. ing. Further, since this cylindrical vibration isolator normally has a large amount of differential movement, in order to secure the durability of the rubber elastic body 7 by restricting an excessive relative displacement between the main shaft member 5 and the outer cylinder member 6. In addition to the annular stopper 51 fitted to the main shaft member 5, an elastic stopper member 8 in which a stopper portion 84 is inserted and arranged in the currant 71 is also provided.

[0005]

By the way, the stopper portion 82 of the elastic stopper member 8 is formed in conformity with the curved shapes of the currant 71 on the main shaft member 5 side and the outer cylinder member 6 side, and is usually in the circumferential direction. Is formed to have an arc shape with a substantially constant wall thickness. Then, when a large vibration is input to the cylindrical vibration isolator, the stopper portion 8
4 and the rubber elastic body 7 are in strong contact with each other to cause abnormal noise, so that the surface of the stopper portion 84 is textured or coated with silicon to suppress the generation of abnormal noise. I have to.

However, since the embossing cannot be directly applied to the elastic stopper member 8 by machining, the die for vulcanizing and forming the elastic stopper member 8 is manually applied. It becomes very expensive, which causes an increase in cost. Also, when silicon is applied, the cost is unavoidable because silicon is expensive.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a cylindrical vibration isolator capable of realizing a measure for suppressing abnormal noise generation at low cost. Is.

[0008]

A cylindrical vibration isolator according to the invention for solving the above-mentioned problems is a main shaft member and an outer side of the main shaft member with a distance therebetween. An outer cylinder member arranged coaxially, a rubber elastic body having a currant penetrating in the axial direction, which is interposed between the main shaft member and the outer cylinder member to integrally connect them, and the main shaft member An elastic stopper member having an attachment base portion held at one end of the base and a stopper portion extending axially from the attachment base portion and inserted and arranged in the curl of the rubber elastic body, the stopper portion having an arc-shaped cross-section in the direction perpendicular to the axis. In a tubular vibration damping device including, the stopper portion of the elastic stopper member,
A means is adopted which has a raised portion that extends from the central portion in the direction perpendicular to the axis toward both ends and that gradually increases toward the outer peripheral side or the inner peripheral side toward both ends.

In the tubular vibration damping device of the present invention, when a large radial vibration is input to the tubular vibration damping device,
The main shaft member and the outer tubular member relatively move in the radial direction, and the rubber elastic body elastically deforms. As a result, the stopper portion of the elastic stopper member that is inserted and arranged in the curb of the rubber elastic body is sandwiched between the curving wall surface of the rubber elastic body and is compressed, resulting in excessive relative displacement between the main shaft member and the outer cylinder member. Is elastically regulated.

At this time, since the raised portions provided on the stopper portion are formed so as to be gradually raised toward the outer peripheral side or the inner peripheral side toward the both ends, the central portion from the both end portions of the raised portion is formed. It comes in contact with the wall surface in the order of. Therefore, in the surface of the stopper portion on the side where the raised portion is projected, the raised portion first comes into contact with the curled wall first, and the raised portion gradually comes into contact with the central portion from both ends,
The entire surface does not contact at the same time. This reliably reduces abnormal noise that tends to occur when a large vibration is input.

Since the raised portion in the present invention can be easily formed when the elastic stopper member is formed by vulcanization molding, a large increase in cost can be avoided.

Therefore, in the tubular vibration-damping device of the present invention, since the above-mentioned raised portion is provided in the stopper portion of the elastic stopper member, it is possible to realize a measure for suppressing abnormal noise generation at low cost. .

In the elastic stopper member of the present invention, at least the stopper portion is formed of an elastic body such as rubber or resin. The hardness of the stopper portion is set in accordance with the hardness of the rubber elastic body having the currant into which the stopper portion is inserted and arranged. The raised portion provided on the stopper portion extends from the central portion in the direction perpendicular to the axis toward both ends, and is formed so as to gradually increase toward the outer peripheral side or the inner peripheral side toward the both ends. It is provided in pairs on both sides. A single ridge or a plurality of ridges may be provided in the axial direction of the stopper.

According to a second aspect of the present invention, there is provided the tubular vibration damping device according to the first aspect, wherein the raised portion has an arcuate shape formed at a bending rate different from that of the stopper portion. The means of having a cross-sectional shape is adopted.

According to this means, the raised portion provided on the stopper portion can be set by an easy method. In addition,
If the bending rate of the raised portion is made smaller than the bending rate of the stopper portion, the raised portion is formed so as to rise toward the outer peripheral side of the stopper portion. On the contrary, if the bending rate of the raised portion is made larger than the bending rate of the stopper portion, the raised portion is formed so as to rise toward the inner peripheral side of the stopper portion.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the cylindrical vibration isolator according to the present embodiment taken along the direction perpendicular to the axis, and is a sectional view taken along the line II of FIG. 2, and FIG. 2 is its cylindrical vibration isolator. 2 is a sectional view taken along the axial direction of FIG. 2 and is a sectional view taken along the line II-II of FIG.

The tubular vibration damping device of this embodiment is used as a diff mount, and as shown in FIGS. 1 and 2, a main shaft member 1 having an annular stopper 11, and an outer side of the main shaft member 1. An outer tubular member 2 coaxially arranged with a distance between the main body 1 and the outer tubular member 2, and a rubber elastic body 3 having a pair of gussets 31 and 32 penetrating in the axial direction. , An elastic stopper member 4 having a stopper portion 44 provided with a raised portion 45. In addition,
In the tubular vibration damping device shown in FIGS. 1 and 2, the main shaft member 1 is connected and fixed to a mounting portion of a differential, and the outer cylinder member 6 is connected and fixed to a mounting portion of a vehicle body to be mounted.
A state in which a differential load is applied to the main shaft member 1 is shown.

The main shaft member 1 is made of iron-based metal and is formed into a thick cylindrical shape. An annular stopper 11 is fitted to the central portion of the outer peripheral surface of the main shaft member 1 so as to project radially outward from the outer peripheral surface of the main shaft member 1.

The outer cylinder member 2 is formed of a ferrous metal plate in a cylindrical shape, has an inner diameter larger than the outer diameter of the main shaft fitting 1 by a predetermined dimension, and is formed to have a length slightly shorter than the main shaft fitting 1. . The outer cylinder member 2 is arranged on the outer side of the main shaft member 1 in a substantially coaxial manner with a distance. In this case, the main shaft fitting 1 and the outer cylinder member 2 are slightly eccentric in the vertical direction in the figure because the differential load is applied to the main shaft member 1.

The rubber elastic body 3 is formed into a substantially cylindrical shape by integrally vulcanizing and molding a rubber material together with the main shaft fitting 1 and the outer tubular member 2. The rubber elastic body 3 is vulcanized and adhered to the outer peripheral surface of the main shaft fitting 1 and the inner peripheral surface of the outer cylindrical member 2, and is interposed between the both to integrally connect the both. A pair of bellows 31, 32 penetrating in the axial direction and having an arc-shaped cross section is provided at axially symmetrical positions on both sides of the main shaft fitting 1 in the radial direction of the rubber elastic body 3.

The elastic stopper member 4 is integrally formed by vulcanizing and molding a rubber material. This elastic stopper member 4
As shown in FIGS. 3 and 4, the oval-shaped mounting base 41 having a circular mounting hole 42 in the center thereof, and an axially extending section from one end of the mounting base 41, and a cross section in a direction perpendicular to the axis. The stopper portion 44 is formed in an arc shape having a substantially constant thickness. The stopper portion 44 is formed according to the curved shapes of the currant 31 provided on the rubber elastic body 3 on the main shaft member 1 side and the outer cylinder member 2 side. This stopper portion 44
The central portion in the axial direction of the projection 45 extends from the central portion in the direction perpendicular to the axis toward both ends, and gradually increases toward the outer peripheral side toward both ends.
Is provided. The raised portion 45 has an arcuate cross-sectional shape with a substantially constant wall thickness formed at a bending rate smaller than that of the stopper portion 44 in the direction perpendicular to the axis. As a result, a concave portion 46 formed by the difference in bending rate between the stopper portion 44 and the raised portion 45 is formed in the portion of the inner peripheral surface of the stopper portion 44 where the raised portion 45 is provided.

This elastic stopper member 4 is shown in FIGS.
As shown in FIG. 3, the mounting hole 42 of the mounting base 41 is fitted and fixed to the outer periphery of the one end of the spindle metal fitting 1 in a state where the stopper portion 44 is inserted and arranged in the one end 31 of the rubber elastic body 3. Installed. In this case, the stopper portion 44 inserted and arranged in the currant 31 has its inner peripheral surface abutting on the inner wall surface of the currant 31 and both ends of the raised portion 45 abutting on the outer wall surface of the currant 31. .

The cylindrical vibration isolator of the present embodiment constructed as described above is mounted by connecting and fixing the main shaft member 1 to the mounting portion of the differential and connecting and fixing the outer cylinder member 6 to the mounting portion of the vehicle body. As a result, the state shown in FIGS. 1 and 2 is obtained. In this case, the main vibration input direction (differential load input direction) in the radial direction to the cylindrical vibration damping device is the vertical direction in the drawing.

When large vibration in the radial direction is input to the cylindrical vibration isolator, the main shaft member 1 and the outer cylindrical member 2 relatively move in the radial direction and the rubber elastic body 3 is elastically deformed. As a result, the stopper portion 44 of the elastic stopper member 4 which is inserted and arranged in the currant 31 of the rubber elastic body 3 has the rubber elastic body 3
By being compressed by being sandwiched between the wall surfaces of the curled hole 31, excessive relative displacement between the main shaft member 1 and the outer cylinder member 2 is elastically restricted.

At this time, since the raised portion 45 provided on the stopper portion 44 is formed so as to be gradually raised toward the outer peripheral side toward both ends, the raised portion 45 is formed.
From the both ends to the center, the curls 31 come into contact with the wall surface of the curls. Therefore, on the surface of the stopper portion 44 on the side where the raised portion 45 projects, the raised portion 45 first contacts the wall surface of the currant 31, and the raised portion 45 contacts stepwise from both ends toward the central portion. , The whole surface does not contact at the same time. This reliably reduces abnormal noise that tends to occur when a large vibration is input.

Since the raised portion 45 provided on the stopper portion 44 can be easily formed when the elastic stopper member 4 is formed by vulcanization molding, a large increase in cost can be avoided. .

As described above, in the tubular vibration damping device of this embodiment, since the above-mentioned raised portion 45 is provided on the stopper portion 44 of the elastic stopper member 4, the countermeasure for suppressing the generation of abnormal noise is low. Can be realized at cost.

Further, since the raised portion 45 provided on the stopper portion 44 of the present embodiment is formed so as to have an arcuate cross-sectional shape having a bending rate different from that of the stopper portion 44, the raised portion 45 is formed. Can be set by an easy method.

The raised portion 45 of this embodiment is formed to have a bending ratio smaller than that of the stopper portion 44 so that the raised portion 45 rises toward the outer peripheral side of the stopper portion 44. Like the elastic stopper member 4a shown in FIG. 10, the bending rate of the raised portion 45a is made larger than the bending rate of the stopper portion 44a so that the raised portion 45a is raised toward the inner peripheral side of the stopper portion 44a. Good. Also in this case, the same effect as in the case of the above embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view taken along a direction perpendicular to an axis of a tubular vibration-damping device according to an embodiment of the present invention, which is a sectional view taken along the line I-I of FIG.

FIG. 2 is a cross-sectional view taken along the axial direction of the tubular vibration-damping device according to the embodiment of the present invention, which is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a front view of the elastic stopper member according to the embodiment of the present invention as viewed in the axial direction.

FIG. 4 is a side view of the elastic stopper member according to the embodiment of the present invention.

FIG. 5 is a front view of an elastic stopper member according to a modified example of the present invention as viewed in the axial direction.

FIG. 6 is a side view of an elastic stopper member according to a modified example of the present invention.

FIG. 7 is a cross-sectional view of a conventional cylindrical vibration damping device taken along a direction perpendicular to the axis, and is a cross-sectional view taken along the line VII-VII of FIG.

8 is a cross-sectional view taken along the axial direction of a conventional cylindrical vibration damping device, which is a cross-sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a front view of a conventional elastic stopper member as seen from the axial direction.

10 is a cross-sectional view taken along the axial direction of a conventional elastic stopper member and is a cross-sectional view taken along the line XX of FIG.

[Explanation of symbols]

1, 5 ... Main shaft member 2, 6 ... Outer cylinder member 3, 7
... rubber elastic bodies 4, 4a, 8 ... elastic stopper members 11, 51 ... annular stoppers 31, 32, 71, 72 ... curls 41, 81 ... mounting bases 42 ... mounting holes 44, 44a, 84 ... stoppers 45, 45a ... Raised portion 46 ... Recessed portion

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3D035 CA05 CA06                 3J048 AA01 BA19 BB01 CB05 EA01                       EA07                 3J059 AA04 BA42 BA74 BC06 DA13                       GA09 GA12

Claims (2)

[Claims] 1. A main shaft member, an outer cylinder member arranged outside the main shaft member in a substantially coaxial shape with a distance therebetween, and an outer cylinder member interposed between the main shaft member and the outer cylinder member to integrally form both members. A rubber elastic body that has a currant that penetrates in the axial direction, and a mounting base portion that is held at one end of the main shaft member, and that extends in the axial direction from the mounting base portion and that is inserted into the currant of the rubber elastic body. An elastic stopper member having a stopper portion whose cross-sectional shape in the direction perpendicular to the axis is arcuate, and the stopper portion of the elastic stopper member has both ends from a central portion in the direction perpendicular to the axis. A tubular vibration-damping device having a raised portion that is formed so as to extend toward the outer peripheral side or the inner peripheral side toward the both ends. 2. The tubular vibration damping device according to claim 1, wherein the raised portion has an arcuate cross-sectional shape formed with a bending rate different from that of the stopper section.