JPH11117973A - Cylinder type vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of flow down of press-in liquid, applied on the end faces of the extension tips on both sides of the rubber elastic support body of the cylinder type vibration control device, when the rubber elastic support part is pressed in the circular mounting hole of a bracket. SOLUTION: When a bush part 10 having rubber elastic substance support parts 12 formed on the outer peripheral surface of an inner cylinder metal fitting 11 extending to both sides in an orthogonal direction to a shaft orthogonal direction is pressed in the cylindrical member 21 of a mounting metal fitting 20, press-in liquid is applied on the extension tip surface 12c1 of the rubber elastic support part to perform smooth press-in. A plurality of slit-form groove parts 12d to hold press-in liquid on the extension tip surface are formed in the extension tip surface, whereby since press-in liquid is prevented from flowing down from the extension tip surface during press in, press-in is smoothly executed. Thereby, the rubber elastic support part is easily pressed in the cylindrical member of the mounting metal in a uniform state that a rubber layer has no strain, and is fixed in a proper position.

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 interposed between a support portion and a supported portion of a vehicle, for example, between a vehicle body and an engine, and elastically suppresses rolling of the supported portion.

[0002]

2. Description of the Related Art Conventionally, as a cylindrical vibration isolator of this kind,
For example, a roll mount for an engine disclosed in Japanese Patent Application Laid-Open No. 7-243463 is known (see FIG. 8). The roll mount includes an inner cylindrical member 1 connected to one of a vehicle body side and an engine side, and is fixed to an outer peripheral surface of the inner cylindrical member 1 and extends toward both sides in a direction perpendicular to the axis thereof. A rubber elastic body support portion 2 having a convex curved surface and elastic body stopper portions 3 integrally formed on both side surfaces orthogonal to the extending direction of the rubber elastic body support portion are provided. The rubber elastic body support portion 2 is press-fitted into a circular mounting hole (not shown) which is a mounting portion such as a bracket provided on the other of the vehicle body side and the engine side, and the elastic body stopper portion 3 has a circular mounting hole. It is positioned opposite the inner peripheral surface in the roll load input direction.

In the above-mentioned cylindrical vibration isolator, the rubber support elastic support 2 press-fitted into the circular mounting hole includes the inner cylindrical fitting 1.
And is extended toward both sides in the direction perpendicular to the axis thereof, and is pressed against the inner peripheral surface of the circular mounting hole to be press-fitted at two places. Therefore, when the rubber elastic body supporting portion 2 is press-fitted and inserted into the circular mounting hole, the rubber elastic body supporting portion 2 easily falls down and bends, so that uniform press-fitting is not easy and proper positioning of the press-fitting position is also difficult. It's not easy. For this reason, a press-fitting liquid is applied to both ends of the rubber elastic body supporting portion 2 to facilitate press-fitting, and after excessively press-fitting into the circular mounting hole in order to remove distortion of the rubber layer due to press-fitting, By performing the returning operation, uniform press-fitting is enabled and an appropriate press-fitting position is ensured.

[0004]

However, since the front end surfaces of both sides of the rubber elastic body support portion 2 are formed in a convex curved shape, the press fitting applied to the front end surfaces of both sides during the press fitting operation is performed. There is a problem that the liquid flows down and the effect of smooth press-fitting by applying the press-fitting liquid is impaired. The present invention is intended to solve the above-described problem, and the press-fitting liquid applied to the both-side extending front end surfaces of the rubber elastic body support portion press-fits the rubber elastic body support portion into a circular mounting hole such as a bracket. It is an object of the present invention to provide a cylindrical vibration isolator that can be prevented from flowing down from a tip surface.

[0005]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, a structural feature of the invention according to the first aspect is that the invention has a cylindrical mounting portion, and has a support portion side of a vehicle and a cylindrical mounting portion. A mounting bracket connected to one of the supported parts side, and an inner cylindrical metal fitting coaxially inserted into the mounting part of the mounting bracket and connected to one of the other of the support part side and the supported part side. , Which is fixed to the outer peripheral surface of the inner cylindrical fitting and extends toward both sides in the direction perpendicular to the axis of the inner cylindrical fitting, and the extended distal end faces on both sides are formed into a convex curved shape, and the press-fitting liquid is applied to the extended distal end faces on both sides. The rubber elastic body support is press-fitted into the mounting part of the mounting bracket in a state where the rubber elastic body support is extended. Having an elastic stopper portion provided with a gap with respect to the inner peripheral surface of the portion A vibration damping device, in that a plurality of slit-like groove portion or hole-shaped recess to hold a press-fit solution to extending front end face of the rubber elastic body supporting portion.

In the invention according to claim 1 configured as described above, a plurality of slit-shaped grooves or a plurality of hole-shaped concave portions capable of holding a press-fitted liquid are provided on the extending front end surface of the rubber elastic body supporting portion. Thus, when the rubber elastic body supporting portion is press-fitted into the mounting portion of the mounting bracket, the press-fitting liquid applied to the extending distal end surface is held in the groove or the concave portion by the surface tension. Therefore, the flow of the press-fitting liquid from the extension end surface is suppressed, so that the press-fitting of the rubber elastic body supporting portion into the mounting portion is performed smoothly. As a result, according to the first aspect of the present invention, the rubber elastic body supporting portion can be easily pressed into the mounting portion of the mounting bracket in a uniform state without distortion in the rubber layer, and can be fixed at an appropriate position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a cylindrical vibration isolator interposed between an engine and a vehicle body of the embodiment. FIG. 3 is a front view, a side view, and a plan view of the apparatus (roll mount). The cylindrical vibration isolator includes a bush member 10.
And a fitting 20 into which the bush member 10 is press-fitted.

As shown in FIGS. 4 to 6, the bush member 10 has a cylindrical inner cylinder fitting 11 attached to the engine side (or the vehicle body side). Rubber elastic body support portions 12 are provided extending on both sides in the direction (lateral direction in the drawing). Rubber elastic body support 12
Is fixed to the outer peripheral surface of an intermediate portion excluding portions near both ends in the axial direction of the inner cylinder fitting 11, and has a substantially cylindrical inner portion 12 a around the inner cylinder fitting 11 and an intermediate portion extending substantially parallel to the outside thereof. 1
2b and an outer portion 12c extending outside thereof. The outer portion 12c has a trapezoidal extension end surface 12c1 having an outer end portion coaxially arcuate with respect to the inner cylinder fitting 11 and having both sides inclined with respect to the axial direction of the inner cylinder fitting 11. And both sides in the circumferential direction are convex portions 12c2 protruding in the circumferential direction. The convex portion 12c2 is gradually widened in the circumferential direction from the intermediate portion 12b to the extending front end surface 12c1, and the side edge in the circumferential direction is formed in an arc shape.
Further, as shown in FIGS. 5 and 6, the rubber elastic body supporting portion 12 has a width between both ends in the axial direction from the inner portion 12 a to the outer portion 1.
It gradually narrows slightly toward 2c.

FIG. 4 to FIG.
As shown in FIG. 6, a plurality of slit-shaped grooves 12d parallel to each other in the axial direction are provided. This groove 12d
Before press-fitting the rubber elastic body support portion 12 into the cylindrical mounting portion of the mounting bracket 20, the press-fitting liquid applied to the extension tip surface 12c1 is held by surface tension. This is to prevent the water from flowing down from the surface 12c1. Therefore, the groove 12d needs to be narrow and disposed on the entire front end surface 12c1 in order to efficiently hold the press-fitted liquid. The direction in which the grooves 12d are formed does not necessarily have to be parallel to the axial direction. However, it is not preferable that the grooves 12d be perpendicular to the axial direction, since this will promote the drop of the press-fitted liquid.

As shown in FIGS. 4 to 7, a pair of upper and lower stoppers projecting from both sides of the inner portion 12a in a direction perpendicular to the direction in which the rubber elastic body support portion 12 extends, as shown in FIGS. Parts 13 and 14 are provided. The surfaces of the stopper portions 13 and 14 having a substantially trapezoidal pyramid shape are chamfered in a curved shape. Although the widths of the stopper portions 13 and 14 in the direction perpendicular to the axis are the same, the width in the axial direction is smaller in the upper stopper portion 13 than in the lower stopper portion 14, so that there is a difference in stopper characteristics. Have been. However, as shown in FIG. 8, the shape of the stopper portions 13 and 14 extends to the outer portions 12c on both sides centering on the inner portions 12a on both side surfaces orthogonal to the extending direction of the rubber elastic body supporting portion 12. The outer periphery may be an arc-shaped stopper. The bush member 10 is integrally formed by performing rubber vulcanization molding in a state where the inner cylinder fitting 11 is set in a molding die (not shown).

As shown in FIGS. 1 to 3, the bush portion 10 is mounted by press-fitting a cylindrical member 21 of a mounting bracket 20. Here, the illustrated arrow R
Indicates a direction in which a roll load is applied to the bush portion 10 from the engine side. The mounting bracket 20 includes a cylindrical member 21.
And an irregularly shaped attachment member 22 fixed to the outer periphery by welding and attached to the vehicle body (or the engine side). The mounting member 22 has a cylindrical mounting portion 23 formed by bending a metal plate into a substantially U-shape. The tubular portion mounting portion 23 is provided with a pair of bent portions 23b and 23c bent at a right angle to the connecting plate portion 23a. At opposite ends of the bent portions 23b and 23c with respect to the connecting plate portion 23a, mounting concave portions 23b1 and 23c1 cut out in an arc shape.
Are formed, and both sides are formed such that one side extends from the other side. The tubular member 21 is fixed to the mounting recesses 23b1 and 23c1 by welding at positions indicated by oblique lines in the drawing. One fixing portion 23a1, 23a2 is provided at a position near both ends of the connecting plate portion 23a.

A reinforcing member 24 is fixed to a position of the one bent portion 23b near the other side by welding at a position shown by oblique lines in the figure. As shown in FIGS. 1 to 3, the reinforcing member 24 is formed by drawing a bottom plate 24 a having a right-angled triangular shape with an acute end cut out, and drawing at right angles to the bottom plate 24 a on the oblique side and on one side opposed to the oblique side. Folded plates 24b and 24c are provided. A fixing portion 24a1 is provided near the cutout position of the bottom plate 24a.
The mounting bracket 20 includes fixing portions 23a1, 23a2, 24a1.
With this, it is fixed to the vehicle body side (or the engine side).

In the cylindrical vibration isolator constructed as described above, when the bush portion 10 is press-fitted into the cylindrical member 21 of the mounting bracket 20, the rubber elastic body support portion 12 is extended to smoothly press-fit. The press-fitting liquid is applied to the front end face 12c1, but the plurality of slit-shaped grooves 12d capable of holding the press-fitting liquid are provided on the extended front end face 12c1, so that the press-fitting liquid applied from the extending front end face 12c1 during press-fitting is provided. Does not flow down, the effect of applying the press-in liquid is maintained, and the press-in is smoothly performed. Therefore, in the present embodiment,
The rubber elastic body support portion 12 can be easily press-fitted into the rubber layer of the mounting member 20 in a uniform state without distortion, and can be fixed at an appropriate position.

In the above embodiment, a slit-like groove 12d is formed in the extension end surface 12c1 to prevent the applied press-in liquid from flowing down. May be provided. The shape of the concave portion may be any shape other than the circle. Further, the specific outer shape and the like of the cylindrical vibration isolator of the present invention are not limited to those described in the above embodiment, and can be changed as appropriate.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a cylindrical vibration isolator according to one embodiment of the present invention.

FIG. 2 is a left side view showing the cylindrical vibration isolator.

FIG. 3 is a plan view showing the cylindrical vibration isolator.

FIG. 4 is a front view showing a bush member used for the cylindrical vibration isolator.

FIG. 5 is a plan view showing the bush member.

FIG. 6 is a bottom view showing the bush member.

FIG. 7 is a partial cross-sectional view taken along line VII-VII shown in FIG.

FIG. 8 is a front view showing a bush member used for a conventional cylindrical vibration isolator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Bush member, 11 ... Inner tube fitting, 12 ... Rubber elastic body support part, 12a ... Inner part, 12b ... Middle part, 12c ...
Outer portion, 12c1 ... extended tip surface, 12c2 ... convex portion, 12
d: groove portion, 13, 14: stopper portion, 20: mounting bracket,
21: cylindrical member, 22: mounting member, 23: cylindrical portion mounting portion, 23a: connecting plate portion, 23a1, 23a2: fixing portion,
23b, 23c: bent portion, 23b1, 23c1: mounting concave portion, 24: reinforcing member, 24a: bottom plate, 24a1: fixed portion, 24b, 24c: bent plate.

Claims (1)

[Claims] 1. A mounting bracket having a cylindrical mounting portion and connected to one of a support portion side and a supported portion side of a vehicle, and coaxially inserted into the cylindrical mounting portion of the mounting bracket. An inner cylindrical member arranged and connected to the other of the supporting portion side and the supported portion side; and an inner cylindrical member fixed to an outer peripheral surface of the inner cylindrical member and extending toward both sides in a direction perpendicular to the axis of the inner cylindrical member. And a rubber elastic body support portion that is press-fitted into the mounting portion of the mounting bracket in a state where the extension tip surfaces on both sides are formed in a convex curved shape, and the press-in liquid is applied to the extension tip surfaces on both sides. An elastic stopper which is integrally formed on both side surfaces perpendicular to the extending direction of the rubber elastic body support portion, and whose protruding tip surface is provided with a gap with respect to the inner peripheral surface of the mounting portion. And a cylindrical vibration isolator comprising: Cylindrical vibration damping device, characterized in that a plurality of slit-like groove portion or hole-shaped recess that can hold.