JPH11280813A - Attaching structure for vibration-proof bushing and manufacture of inner cylindrical fitting for vibration-proof bushing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching structure for a vibration-proof bushing, which can effectively prevent a nut from loosening. SOLUTION: In an attaching structure for a vibration-proof fitting in which an inner cylindrical fitting 11 of the vibration-proof bushing 1 press-fitted and fixed in the bore of a cylindrical part 21 formed in an end part of a control rod 2, is fitted onto a bolt 31 integrally incorporated with an axle housing 3, and a nut 32 is fastened onto the distal end part of the bolt 31 so as to attach and fix the bushing 1 to the axle housing 3, a projecting part 11a is formed on an end face of the inner cylinder fitting 11, which abuts against the axle housing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an anti-vibration bush used for, for example, a connecting portion of a vehicle, and a method of manufacturing an inner cylinder for the anti-vibration bush.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a control rod 7 connected to an axle housing 8 on a vehicle body and a connecting member 9 on a wheel side has been used for a link mechanism of a suspension mounted on a vehicle. Have been. The control rod 7 has cylindrical portions 71, 71 at both ends, and the vibration isolation bushes 5, 6 fitted and fixed to the respective cylindrical portions 71, 71 respectively provide vibration isolation to the axle housing 8 and the connecting member 9. Are linked. In this case, each cylindrical portion 7
The anti-vibration bushes 5 and 6 fitted and fixed to the first and the first 71 include inner cylinders 51 and 61, outer cylinders 52 and 62 coaxially disposed outside the inner cylinders 51 and 61, and an inner cylinder. Hardware 51, 6
1 and rubber elastic bodies 53 and 63 interposed between the outer cylinder fittings 52 and 62 and integrally connecting the two.
2 and 62 are fixed by press-fitting the cylindrical portions 71 and 71.

[0003] One of the vibration isolating bushes 6 includes a pair of brackets 90 protruding from the connecting member 9 at a distance.
The bolts 91 are inserted between the circular holes formed in the brackets 90 and 90 and the inner holes of the inner cylinder fittings 61, and the nuts 92 are fastened to tighten both ends of the inner cylinder fittings 61. It is attached and fixed to the connecting member 9.

The other vibration-isolating bush 5 is obtained by externally inserting the inner cylinder fitting 51 into a bolt 81 provided integrally with the axle housing 8, fastening a nut 82 and tightening both ends of the inner cylinder fitting 51. , Is fixed to the axle housing 8. In order to improve the fastening reliability, the inner cylinder fittings 51, 61 of the respective vibration-isolating bushes 5, 6 attached in this manner are attached to both end faces of the inner cylinder fittings 51, 61 with the fastening of the nuts 83, 93. In some cases, the projections 51a and 61a are provided so that both end surfaces bite into a mating member to be pressed against. This prevents slippage of the nuts 82 and 92 during fastening and loosening due to vibration or the like after fastening.

The projections 51a and 61a are formed by serration. This serration processing is performed using a serration processing apparatus provided with a pair of truncated cone-shaped balls in which concave grooves and ridges extending in the axial direction on the outer peripheral surface are provided alternately along the circumferential direction. Are rolled in the circumferential direction while simultaneously pressing the balls on both end surfaces of the inner cylinder fittings 51 and 61, thereby forming the inner cylinder fittings 51 and 61.
Serrations are simultaneously formed on both end surfaces of the.

[0006]

The anti-vibration bush 5 of the conventional anti-vibration bushes 5 and 6 which is fixed to the axle housing 8 is a bolt 81 provided integrally with the axle housing 8. Inner tube fitting 51
Is extrapolated. In this case, when the nut 82 is fastened, the projection portion 51a is crushed by rotating the seat portion 83 of the nut 82 with the tightening of the nut 82, and the crushed projection portion 51a is When the nut 82 is partially pressed against the seat portion 83,
Cannot be effectively prevented from being loosened due to vibrations or the like after the fastening.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a mounting structure for a vibration-isolating bush that can effectively prevent loosening of a nut. A second object of the present invention is to provide a method of manufacturing an inner cylinder fitting for a vibration-proof bush that can be manufactured.

[0008]

According to a first aspect of the present invention, there is provided a vibration isolating bush fixed to a first connecting member, the inner cylindrical metal fitting of which is integrally provided on a second connecting member. The bolt is externally inserted, and a nut is fastened to the tip of the bolt to tighten both ends of the inner cylindrical metal fitting, whereby the second
In the mounting structure of the vibration-isolating bush for mounting and fixing the vibration-isolating bush to the connecting member, a means is adopted in which the inner cylindrical fitting has a projection only on an end face abutting on the second connecting member side. .

According to this means, when the nut of the inner cylinder of the vibration isolating bush is externally inserted into the bolt of the first connecting member and the nut is fastened, the second connection of the inner cylinder is accompanied by the tightening of the nut. The protrusion provided on the end surface on the member side bites into the opposing member facing the member, thereby preventing the inner cylindrical fitting from rotating.
On the other hand, since the projection on the nut side end surface of the inner cylinder is not provided, the entire end surface of the inner cylinder is strongly pressed against the nut due to the tightening force of the bolt and nut as the nut is tightened. Become.

Therefore, according to the mounting structure of the vibration isolating bush of the present invention, loosening of the nut can be effectively prevented. The protrusion in the present invention may be formed in a shape that bites into a mating member facing the protrusion when the nut is fastened. For example, a concave groove and a ridge extending in the radial direction are formed in the circumferential direction. And various shapes, such as serrations, which are arranged alternately along the line.

According to a second aspect of the present invention to solve the second problem, the connecting member is externally inserted into a bolt provided integrally with the connecting member, and a nut is fastened to a tip of the bolt to connect the connecting member. A method of manufacturing an inner cylinder fitting for a vibration-proof bush attached and fixed to a member, wherein a long pipe material is cut into a predetermined length having a length of at least two completed inner cylinder fittings. A tubular intermediate product forming step of forming a tubular intermediate product, a projecting portion forming step of forming projections on both end surfaces of the tubular intermediate product, and cutting the center of the tubular intermediate product to form the tubular intermediate product And a dividing step of dividing the article into two pieces.

According to this means, a cylindrical intermediate product having a length of at least two completed inner cylindrical fittings is formed in the intermediate product forming step, and the cylindrical intermediate product is formed in the next projection forming step. After the projections are formed on both end faces, the center of the cylindrical intermediate product is cut into two pieces in a cutting step. Therefore, according to the method for manufacturing the inner cylinder fitting for the vibration-isolating bush of the present invention, the inner cylinder fitting having the protruding portion only at one end surface can be efficiently and easily produced, and the cost can be reduced. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a mounting structure of a vibration isolating bush according to the present embodiment in a partial cross section. The anti-vibration bush 1 of the present embodiment includes an inner cylindrical member 11, an outer cylindrical member 12 arranged coaxially outside the inner cylindrical member 11, and an inner cylindrical member 1.
An inner hole of a cylindrical portion 21 formed at one end of a control rod (first connecting member) 2, comprising a rubber elastic body 13 interposed between the first and outer tube fittings 12 and integrally connecting the two. The outer tube fitting 12 is press-fitted into the housing and fixed.

One end face of the inner cylinder fitting 11 is flat, and the other end face is formed with serrations in which concave grooves and convex ridges extending in the radial direction are alternately arranged along the circumferential direction. Have been. The protruding ridge of the serration is formed in a tapered shape having a sharp tip at the tip, and the protruding ridge forms a protrusion 11a. The inner tube fitting 11 is manufactured by a manufacturing method described later.

In the vibration-isolating bush 1, the inner cylindrical fitting 11 is externally inserted into a bolt 31 provided integrally with the axle housing (second connecting member) 3 by welding or the like from the side where the projection 11a is provided. The nut 31 is fixed to the axle housing 3 by fastening a nut 32 to the tip of the bolt 31 and tightening both ends of the inner cylinder fitting 11. At this time, when the nut 32 is fastened, the axle housing 3
The protruding portion 11a provided on the end surface on the side cuts into the head of the bolt 31 facing the protruding portion 11a, and the rotation of the inner cylindrical fitting 11 is prevented. On the other hand, since the end face of the inner cylinder fitting 11 on the nut 32 side is formed as a flat surface, the entire end face of the inner cylinder fitting 11 is tightened by the tightening force of the bolt 31 and the nut 32 as the nut 32 is tightened. Is in a state of being strongly pressed against the seat portion 33.

Therefore, the anti-vibration bush 1 of this embodiment
According to the mounting structure described above, the loosening of the nut 32 caused by vibration or the like after the fastening of the nut 32 can be effectively prevented, and the nut 33 can be easily tightened when the vibration isolating bush 1 is mounted. .
The other end of the control rod 2 is connected to a wheel-side connecting member via a vibration-isolating bush, which is configured in the same manner as in the conventional case.

Next, a method of manufacturing the inner cylinder fitting 11 will be described. As shown in FIG. 2, the inner cylinder fitting 11 of the present embodiment is manufactured by sequentially performing a cylindrical intermediate product forming step, a projection forming step, a dividing step, and a finishing step. First, in a tubular intermediate product forming step, as shown in FIG. 2A, a long pipe material 4 formed of a predetermined metal material is prepared, and this The cylindrical intermediate product 41 is formed by cutting into a predetermined length L having a length corresponding to two pieces of the metal fittings 11. This cylindrical intermediate product 4
The length L of 1 is appropriately set to include a margin for cutting when cutting in a later dividing step, and a dimension for cutting in a finishing step as needed.

In the next step of forming a projection, as shown in FIG. 2B, a projection 42 is formed by subjecting both end surfaces of the cylindrical intermediate product 41 to serration processing. Here, this is performed using an existing serration processing device provided with a pair of frustoconical balls in which concave grooves and ridges extending in the axial direction are alternately provided on the outer peripheral surface along the circumferential direction. That is, by rolling the pair of balls in the circumferential direction while simultaneously pressing both end surfaces of the cylindrical intermediate product 41, serrations are simultaneously formed on both end surfaces of the cylindrical intermediate product 41 to form the protrusions 42.

Then, in the next dividing step, as shown in FIG. 2C, the center of the tubular intermediate product 41 is cut to divide the tubular intermediate product 41 into two pieces. As a result, one end surface is flattened by the cutting, and two symmetrical and identical cylindrical intermediate products 43, 43 having the projections 42 formed by the serration process in the previous process on the other end surface are formed. You.

Then, in the next finishing step, FIG.
As shown in (1), the end of each of the cylindrical intermediate products 43, 43 is chamfered. In some cases, each cylindrical intermediate product 43,
The flat surface side of 43 is cut or cut into a fixed size. Thereby, as shown in FIG. 3, the inner cylinder fitting 11 having the protrusion 11a formed by serration only on one end surface and the other end surface being a flat surface is completed.

As described above, the inner tube fitting 11 of the present embodiment
According to the manufacturing method of (1), it is possible to efficiently and easily manufacture the inner cylindrical metal fitting 11 having the protruding portion 11a only on one end surface,
Cost can be reduced. The serration processing device used in the projection forming step is a cylindrical intermediate product 41.
An existing processing device that forms serrations on both end surfaces of the substrate at the same time can be used, and a dedicated processing device that forms serrations only on one end surface is not required. In this case, since serrations are simultaneously formed on both end surfaces of the cylindrical intermediate product 41, a change in size and shape of the cylindrical intermediate product 41 during serration processing can be reduced, and quality can be stabilized. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a mounting structure of an anti-vibration bush according to an embodiment of the present invention in a partial cross section.

FIG. 2 is an explanatory diagram showing a manufacturing process of the inner cylinder fitting for the vibration-proof bush according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a protrusion formed on one end surface of the inner cylinder in a manufacturing process of the inner cylinder for an anti-vibration bush according to the embodiment of the present invention.

FIG. 4 is an explanatory view showing, in partial cross section, a conventional mounting structure of a vibration-isolating bush.

[Explanation of symbols]

1, 5, 6: anti-vibration bush 2, 7, ... control rod (first connecting member) 3, 8: axle housing (second connecting member) 4
... Pipe material 9 ... Connecting member 11,51,61 ... Inner tube fitting 11a, 51a, 61a ... Protrusion 12,52,6
2 ... outer cylinder fittings 13, 53, 63 ... rubber elastic body 21, 71 ... tubular part 31, 81, 91 ... bolt 32, 82, 92 ... nut 33, 83, 93 ... seat part 41, 43 ... tubular middle Product 42 ... Protrusion 90 ... Bracket

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazumasa Asami 10-1 Amanuma, Hiratsuka-shi, Kanagawa Inside Nissan Shatai Co., Ltd.

Claims (2)

[Claims] 1. An inner cylinder fitting of an anti-vibration bush fixed to a first connecting member is externally inserted into a bolt integrally provided on a second connecting member, and a nut is fastened to a tip of the bolt to tighten the inner cylinder. In the mounting structure of the vibration-isolating bush, which fixes and fixes the vibration-isolating bush to the second connecting member by tightening both ends of the metal fitting, the inner cylindrical metal fitting is attached to an end surface that contacts the second connecting member side. A mounting structure for an anti-vibration bush, characterized in that the mounting structure has only protrusions. 2. A method of manufacturing an inner cylinder for an anti-vibration bush, which is externally inserted into a bolt provided integrally with a connecting member and a nut is fastened to a tip of the bolt to be attached and fixed to the connecting member. A tubular intermediate product forming step of forming a tubular intermediate product by cutting a long pipe material into a predetermined length having a length corresponding to at least two completed inner cylindrical fittings; A projecting portion forming step of forming projecting portions on both end surfaces of the cylindrical intermediate product; and a dividing step of cutting the center of the cylindrical intermediate product and dividing the cylindrical intermediate product into two pieces, in order. A method for producing an inner cylinder fitting for a vibration-proof bush, characterized by the following.