JP2002046031A - Press-in method for elastic bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly press an outer cylinder-less type elastic bush capable of reducing the diameter of a flange part on one end positioned on the tip in the bush press-in direction into a support hole formed on a material to be supported, by forming flange parts on both ends of an inter sleeve embedded in an elastic body and forming an axial cutout on the inner sleeve. SOLUTION: A reduced diameter guide 5 is arranged on the opening surface on the inlet side of a support hole 1a of a material to be supported 1, and a flange part 22a on one end of an inter sleeve 22 is introduced into the support hole 1a by reducing the diameter by press-in to the reduced diameter guide 5. The reduced diameter guide 5 is constituted of a plurality of segments 5a freely openable and closeable in the radial direction, the segments 5a are radially opened after press-in of a bush to separate the reduced diameter guide 5. A recessed part 4a for receiving the flange part 22a on one end projected from the support hole 1a is formed on a fixing jig 4 to abut on the outlet side opening surface of the support hole 1a of the article to be supported 1 into an oval shape taking the direction parallel to the width direction of a cutout 22c of the inter sleeve 22 as the major axial direction, and the flange part 22a is prevented from being caught in the fixing jig 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for press-fitting an elastic bush used to elastically support a supported object by fitting it into a support hole formed in the supported object such as a suspension arm. .

[0002]

2. Description of the Related Art Heretofore, as this kind of elastic bush, there has been known an elastic bush having an inner cylinder, an elastic body fixed to the outer periphery of the inner cylinder, and an inter sleeve embedded at a radially intermediate portion of the elastic body. . Further, the elastic bush has an outer cylinder fixed to the outer periphery of the elastic body and is press-fitted and fixed to the support hole of the supported object by the outer cylinder. There is an outer cylinder-less type in which an elastic body is brought into direct contact.

[0003] The outer cylinder-less type has an advantage that the cost is lower than that of the type with an outer cylinder. However, since the fixing to the support hole is obtained only by the interference of the elastic body, the drawback that the pull-out load is reduced. There is. Therefore, in the outer cylinder-less type elastic bush, at both ends of the inter sleeve, a flange portion is formed to project radially outward from the axial projection surface of the support hole in a state where the elastic bush is fitted into the support hole, It has been considered that the flange portion at one end and the flange portion at the other end increase the resistance to removal in one direction and the other in the axial direction so that the removal load can be increased.

[0004]

In the case where flange portions are formed at both ends of the inter sleeve as described above in the outer cylinder-less type elastic bush, the flange portions at both ends are located at positions forward in the press-fitting direction of the elastic bush into the support holes. A notch is formed in at least a part of the flange portion at one end in the circumferential direction so as to reduce the diameter of the flange portion at one end, and is supported when the elastic bush is pressed into the support hole. An annular reduced diameter guide whose inner diameter decreases as approaching the support hole is arranged on the entrance side opening surface of the support hole of the object, and the flange portion at one end of the inter sleeve is pressed down into the reduced diameter guide to support it. It is necessary to guide it into the hole. However, in this state, the reduced diameter guide is pressed by the flange portion at the other end of the inter sleeve due to the press-fitting of the elastic bush, and the reduced diameter guide cannot be detached.

SUMMARY OF THE INVENTION In view of the above, the present invention makes it possible to remove a reduced diameter guide after press-fitting, and supports an outer cylinderless type elastic bush having flange portions formed at both ends of an inter sleeve using a reduced diameter guide. An object of the present invention is to provide a method capable of smoothly press-fitting a hole.

[0006]

Means for Solving the Problems In order to solve the above problems,
An elastic bush that is fitted into a support hole formed in a supported object to elastically support the supported object, and is in direct contact with the inner cylinder and the inner surface of the support hole fixed to the outer periphery of the inner cylinder. And an inter sleeve embedded in a radially intermediate portion of the elastic body. At both ends of the inter sleeve, an elastic bush is fitted radially outwardly from the axial projection surface of the support hole with the elastic bush fitted in the support hole. While forming a flange that projects toward
A notch is formed in at least a part of the flange at one end in the circumferential direction of the flange at one end located in the press-fitting direction of the elastic bush with respect to the support hole, and the flange at one end is formed at the flange at one end. According to a first feature of the present invention, in a method of press-fitting a member which can be reduced in diameter into a support hole, an annular shape in which an inner diameter becomes smaller as approaching the support hole is provided on an inlet-side opening surface of the support hole of the object to be supported. A plurality of segments which are provided with a diameter reducing guide, and which reduce the diameter of the flange portion at one end of the inter sleeve by being pushed into the diameter reducing guide so as to be guided into the support hole, and which can be opened and closed in the radial direction. According to the second feature of the present invention, an annular reduced-diameter guide is provided on the inlet-side opening surface of the support hole of the supported object. Are arranged, and at a plurality of locations in the circumferential direction of the inner circumference of the diameter-reducing guide, a guide projection is provided in which the amount of projection inward in the radial direction increases toward the support hole, and the flange portion at the one end of the inter sleeve is provided. By pressing the guide into the reduced diameter guide, the diameter is reduced by the guide projection so that it is introduced into the support hole, and a plurality of concave portions in the circumferential direction are formed in the flange portion at the other end of the inter sleeve in the same phase as the guide projection. And
After the press-fitting of the elastic bush, the reduced diameter guide is detached in the axial direction so that each guide protrusion passes through each concave notch,
Further, according to the third feature of the present invention, the inner diameter of the support object at the entrance side opening surface of the support hole becomes smaller as approaching the support hole, and is opened in one radial direction matching the notch. A reduced diameter guide having a substantially U-shape is disposed, and the flange portion at one end of the inter sleeve is reduced in diameter by being pushed into the reduced diameter guide so as to be guided into the support hole. The guide is detached in the direction opposite to the opening direction of the guide.

In any of the first to third features, after the elastic bush is press-fitted, the diameter reducing guide can be detached without being disturbed by the flange portion at the other end of the inter sleeve, and thus the elastic bush can be contracted. It can be smoothly pressed into the support hole using a diameter guide.

When the elastic bush is press-fitted, the outlet side opening surface of the support hole of the supported object is brought into contact with a fixing jig to receive the press-fit load of the elastic bush. In this case, the fixing jig is provided with a concave portion for receiving the flange portion at the one end of the inter sleeve which is pushed out from the outlet of the support hole upon completion of the press-fitting of the elastic bush, but when the flange portion at one end is pushed out from the support hole, The flange portion is strongly pressed against the inner surface of the concave portion in an attempt to expand the diameter in a direction parallel to the width direction of the cutout formed in the flange portion, and catches on the fixing jig. Therefore, according to a fourth feature of the present invention, the concave portion provided in the fixing jig is formed in an elliptical shape whose major axis is a direction parallel to the width direction of the notch. According to this, the diameter of the flange portion at one end pushed out from the support hole is allowed to increase in the concave portion, and the flange portion does not strongly contact the inner surface of the concave portion, thereby preventing the fixing jig from being caught.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1A, reference numeral 1 denotes a suspension arm which is a supported object, and an elastic bush 2 is fitted into a support hole 1a at an end of the suspension arm 1. The elastic bush 2 includes a metal inner cylinder 20, an elastic body 21 made of rubber fixed to the outer periphery of the inner cylinder 20, and a metal intersleeve 22 embedded at a radially intermediate portion of the elastic body 21. Thus, an outer cylinderless type in which the elastic body 21 is brought into direct contact with the inner surface of the support hole 1a is configured. Then, a pair of support shafts 3, 3 are attached to the inner cylinder 20 from both sides in the axial direction.
Into contact with both ends of
A bracket portion 3b extending outward from a is fastened to a vehicle body (not shown) through a mounting hole 3c formed in the bracket portion 3b.

The elastic body 21 includes a cylindrical portion 21a fitted into the support hole 1a, leg portions 21b formed at a plurality of circumferential locations on the inner periphery of the central portion of the cylindrical portion 21a, and fixed to the inner cylinder 20;
a stopper portion 2 formed by swelling radially outward at one end and the other end in the axial direction of a cylindrical portion 21a protruding in the axial direction from a.
1c and 21d, and the inter sleeve 22 is embedded in the cylindrical portion 21a so as to reach the stopper portions 21c and 21d at both ends. Flanges 22a and 22b that are bent radially outward in the respective stoppers 21c and 21d are formed at one end and the other end in the axial direction of the inter sleeve 22, respectively. Here, as shown in FIG. 2B, the flange portion 22a at one end and the stopper portion 21c at one end are formed in an elliptical shape having a minor diameter smaller than the diameter of the support hole 1a, and a flange at the other end. Part 22b and stopper part 21 at the other end
d is formed in a substantially circular shape as shown in FIG. Then, as shown in FIG. 3 (B), the notches 22 c, 22 c extending over the cylindrical portion of the inter sleeve 22 are positioned at both ends of the flange 22 a at one end as shown in FIG.
2 and the cylindrical portion 21a of the elastic body 21 is formed as shown in FIG.
As shown in FIG. 3A and FIG.
With the same phase as that of the notch 2c, split grooves 21e, 21e reaching the end face of the stopper portion 21c at one end are formed.
2c and the split groove 21e are formed so as to widen toward one end in the axial direction, and the flange portion 22a at one end and the stopper portion 2 are formed.
2c can be reduced in the major axis direction of the elliptical shape.
In the present embodiment, the notch 22c and the split groove 21e are formed over the entire lengths of the inter sleeve 22 and the cylindrical portion 21a, respectively, and the inter sleeve 22 and the cylindrical portion 21a are each formed into a half-shaped half. The notch 22c and the split groove 21e are divided into a flange 22b and a stopper 2 at the other end.
Terminating just before 1d, the sleeve 22 and the cylinder 2
1a can also be undivided.

When the elastic bush 2 is fitted in the support hole 1a, as shown in FIG.
An outer edge portion in the major diameter direction of 2a projects radially outward from the axial projection surface of the support hole 1a. The other end of the flange 2
2b also protrudes radially outward from the axial projection surface of the support hole 1a, and thus the flange portions 22a at one end and the other end are provided.
By 22b, a resistance force against detachment in one direction and the other in the axial direction is obtained, and the detachment load increases.

When the elastic bush 2 is pressed into the support hole 1a, as shown in FIG. 4 (A), the outlet side opening surface of the support hole 1a of the suspension arm 1 is brought into contact with the fixing jig 4, and the suspension arm An annular diameter-reduced guide 5 is arranged on the opening surface of the support hole 1a on the entrance side, and the elastic bush 2 is pressed into the support hole 1a from one end through the diameter-reduced guide 5. Here, the diameter-reducing guide 5 is formed such that the inner diameter becomes smaller as approaching the support hole 1a, and the flange portion 22a and the stopper portion 21c at one end are reduced in diameter by being pushed into the diameter-reducing guide 5 so that the support hole is reduced. 1a.
In the press-fitting completed state, as shown in FIG. 4B, the flange portion 22a at one end and the stopper portion 21c are pushed out from the outlet of the support hole 1a, and the flange portion 22b at the other end is connected to the support hole 1a side of the diameter reducing guide 5. And the diameter is slightly reduced. Here, as shown in FIG. 4 (c), the diameter reducing guide 5 has two segments 5a, 5a which can be opened and closed in the radial direction.
After the elastic bush 2 is press-fitted, the segments 5a, 5a are opened in the radial direction to release the reduced diameter guide 5.

The fixing jig 4 has a flange 22a at one end and a stopper 21 which is pushed out of the support hole 1a.
A concave portion 4a for receiving c is provided. Recess 4a
As shown in FIG. 4 (D), the elliptical shape is a direction parallel to the width direction of the notch 22c, that is, the major axis direction is the elliptical shape of the flange 22a at one end and the stopper 21c. Is formed. Thus, the flange portion 22a at one end and the stopper portion 2 extruded from the support hole 1a
The diameter expansion in the recess 4a of 1c is allowed. Therefore, the flange portion 22a and the stopper portion 21c at one end do not strongly press against the inner surface of the concave portion 4a, so that the fixing jig 4 is prevented from being caught. The fixing jig 4 comes into contact with the outlet-side opening surface of the support hole 1a at the upper surface portion on both sides in the minor diameter direction of the concave portion 4a, and can reliably receive the press-fitting load.

The diameter reducing guide is not limited to the above, and a diameter reducing guide 6 as shown in FIGS. 5A, 5B and 5C may be used. The diameter-reducing guide 6 is annular, and is provided at a plurality of locations in the circumferential direction of the inner circumference thereof, for example, at both ends of the flange portion 22a and the stopper portion 21c at one end in the long-diameter direction as it approaches the support hole 1a. A guide protrusion 6a having a large protrusion amount is provided so as to protrude.
a, the flange portion 22a at one end and the stopper portion 21c
Is reduced in diameter. As shown in FIG. 5C, a plurality of recesses 22d in the circumferential direction are formed on the other end of the flange portion 22b in the same phase as the guide protrusion 6a. Thus, if the reduced diameter guide 6 is moved in the axial direction after the elastic bush 2 is press-fitted, the guide projection 6a passes through the concave notch 22d, and the reduced diameter guide 6 interferes with the flange 22b at the other end. It can be separated from the elastic bush 2 in the axial direction without any occurrence.

It is also possible to use a diameter reducing guide 7 as shown in FIGS. 6A, 6B and 6C. The diameter-reducing guide 7 is formed so that the inner diameter decreases as it approaches the support hole 1a, and this point is the same as the diameter-reducing guide 5 shown in FIG. 4, but is different from that shown in FIG. It is formed in a substantially U-shape that is open to one side in the radial direction corresponding to the notch 22c, that is, one side in the short diameter direction of the flange portion 22a and the stopper portion 21c at one end. Thus, in this embodiment, after the elastic bush 2 is press-fitted, the diameter-reduced guide 7 can be separated from the elastic bush 2 by moving the guide 7 in the direction opposite to the opening direction, that is, in the other short-axis direction. FIG.
In the case where either the diameter reducing guide 6 of FIG. 6 or the diameter reducing guide 7 of FIG. 6 is used, as in the case of using the diameter reducing guide 5 of FIG. The press-fitting operation is performed by bringing the outlet side opening surface of the support hole 1a of the arm 1 into contact.

As described above, the support hole 1 of the suspension arm 1
Although the method of press-fitting the elastic bush 2 into a has been described, the present invention can be similarly applied to press-fitting the elastic bush into a support hole of a supported object other than the suspension arm.

[0017]

As is apparent from the above description, according to the present invention, the diameter-reduced guide can be released after the bush is press-fitted, and the outer cylinder-less type in which flange portions are formed at both ends of the inter sleeve is provided. The elastic bush can be smoothly pressed into the support hole of the supported object using the reduced diameter guide, and the flange at one end can be prevented from being caught by the fixing jig that receives the press-fit load. Can be

[Brief description of the drawings]

1A is a sectional side view of an elastic bush in a used state, and FIG. 1B is a sectional view taken along line IB-IB of FIG. 1A.

2A is a side view of the bush in a free state, FIG.
(B) a front view of the bush seen from the left side of FIG.
(C) Rear view of the bush seen from the right side of FIG. 2 (A)

FIG. 3A is a perspective view of the bush in a free state,
(B) Perspective view of the inter sleeve

FIG. 4A is a sectional side view showing an initial state of the press-fitting operation of the bush using the diameter reducing guide of the first embodiment,
(B) a cut-away side view showing a completed state of the press-fitting operation;
(C) Plan view seen from above in FIG. 4 (B), (D) Plan view of fixing jig

FIG. 5A is a sectional side view showing an initial state of the press-fitting operation of the bush using the diameter-reducing guide of the second embodiment,
(B) a cut-away side view showing a completed state of the press-fitting operation;
(C) Plan view seen from above FIG. 5 (B)

FIG. 6A is a cross-sectional side view showing an initial state of the press-fitting operation of the bush using the reduced-diameter guide of the third embodiment,
(B) a cut-away side view showing a completed state of the press-fitting operation;
(C) Plan view seen from above FIG. 6 (B)

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Suspension arm (supported object) 1a Supporting hole 2 Elastic bush 20 Inner cylinder 21 Elastic body 22 Intersleeve 22a Flange part at one end 22b Flange part at the other end 22c Notch 22d Concave notch 4 Fixing jig 4a Recess 5 Reducing diameter Guide 5a Segment 6 Reduced diameter guide 6a Guide protrusion 7 Reduced diameter guide (U-shaped guide)

Continued on the front page (72) Inventor Satoshi Ogawa 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (Reference) 3C030 BB12 BC26 3J048 AA01 BA19 BB03 EA17 3J059 AD02 AE01 BA42 BC06 CC01 EA14 GA02

Claims (4)

[Claims] An elastic bush used to fit in a support hole formed in a supported object to elastically support the supported object, the elastic bush being fixed to an inner cylinder and an outer periphery of the inner cylinder. An elastic body that directly contacts the inner surface of the elastic body, and an intersleeve embedded in a radially intermediate portion of the elastic body, and axial projection of the support hole in a state where the elastic bush is fitted into the support hole at both ends of the intersleeve. A flange portion projecting radially outward from the surface is formed, and at least a part of the flange portion at one end in the circumferential direction of the flange portion at one end located in the press-fitting direction of the elastic bush into the support hole among the flange portions at both ends. In the method of forming a notch over the shape portion and press-fitting into the support hole the one that allows the flange portion at one end to be reduced in diameter, the inner diameter becomes closer to the support hole at the entrance side opening surface of the support hole of the object to be supported. Becomes smaller A plurality of diameter-reduced guides are arranged, and the flange portion at the one end of the inter sleeve is pushed into the diameter-reduced guide so as to be reduced in diameter and guided into a support hole. The elastic bush is press-fitted, and the segments are opened radially after the elastic bush is press-fitted. 2. An elastic bush used to fit in a support hole formed in a supported object and elastically support the supported object, the elastic bush being fixed to an inner cylinder and an outer periphery of the inner cylinder. An elastic body that directly contacts the inner surface of the elastic body, and an intersleeve embedded in a radially intermediate portion of the elastic body, and axial projection of the support hole in a state where the elastic bush is fitted into the support hole at both ends of the intersleeve. A flange portion projecting radially outward from the surface is formed, and at least a part of the flange portion at one end in the circumferential direction of the flange portion at one end located in the press-fitting direction of the elastic bush into the support hole among the flange portions at both ends. In the method of forming a notch over the shape of a part and press-fitting a flange part at one end capable of being reduced in diameter into a support hole, an annular diameter-reduced guide is arranged on an inlet-side opening surface of the support hole of a supported object. And inside the reduced diameter guide At a plurality of locations in the circumferential direction, projecting guide projections whose radially inward projecting amount increases as approaching the support holes are protruded, and the flange portion at one end of the inter sleeve is pushed into the reduced diameter guide by the guide projection. In addition to reducing the diameter, it is guided into the support hole, and a plurality of concave portions in the circumferential direction are formed in the flange portion at the other end of the inter sleeve in the same phase as the guide protrusion, and each guide protrusion is pressed after the elastic bush is press-fitted. A method for press-fitting an elastic bush, wherein the diameter-reducing guide is detached in the axial direction so as to pass through each concave notch. 3. An elastic bush, which is fitted into a support hole formed in a supported object to elastically support the supported object, the elastic bush being fixed to an inner cylinder and an outer periphery of the inner cylinder. An elastic body that directly contacts the inner surface of the elastic body, and an intersleeve embedded in a radially intermediate portion of the elastic body, and axial projection of the support hole in a state where the elastic bush is fitted into the support hole at both ends of the intersleeve. A flange portion projecting radially outward from the surface is formed, and at least a part of the flange portion at one end in the circumferential direction of the flange portion at one end located in the press-fitting direction of the elastic bush into the support hole among the flange portions at both ends. In the method of forming a notch over the shape portion and press-fitting into the support hole the one that allows the flange portion at one end to be reduced in diameter, the inner diameter becomes closer to the support hole at the entrance side opening surface of the support hole of the object to be supported. Becomes smaller In addition, a substantially U-shaped diameter-reducing guide that is open to one side in the radial direction that matches the notch is arranged, and the flange portion at one end of the inter sleeve is pressed into the diameter-reducing guide to reduce the diameter, thereby forming a support hole. A method of press-fitting an elastic bush, wherein the reduced-diameter guide is separated in a direction opposite to a direction in which the guide is opened after the elastic bush is press-fitted. 4. An elastic bush used to fit in a support hole formed in a supported object to elastically support the supported object, wherein the elastic bush is fixed to an inner cylinder and an outer periphery of the inner cylinder. An elastic body that directly contacts the inner surface of the elastic body, and an intersleeve embedded in a radially intermediate portion of the elastic body, and axial projection of the support hole in a state where the elastic bush is fitted into the support hole at both ends of the intersleeve. A flange portion projecting radially outward from the surface is formed, and at least a part of the flange portion at one end in the circumferential direction of the flange portion at one end located in the press-fitting direction of the elastic bush into the support hole among the flange portions at both ends. In the method of forming a notch over the shape portion and press-fitting the one having a flange portion of one end capable of being reduced in diameter into the support hole, the outlet side opening surface of the support hole of the supported object is brought into contact with the fixing jig. Loading of elastic bush The fixing jig is provided with a concave portion for receiving the flange portion at one end of the inter sleeve which is pushed out from the outlet of the support hole upon completion of the press-fitting of the elastic bush, and the concave portion is formed in the width direction of the notch. A press-fitting method for an elastic bush, wherein the elastic bush is formed in an elliptical shape whose major axis extends in a direction parallel to the elastic bush.