JP4170971B2 - Press-fitting method of vibration-proof bushing into the press-fitting hole of the mounting target member - Google Patents

Description

  The present invention comprises an inner cylinder, an outer cylinder, and a rubber-like elastic body that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder, with the inner cylinder sandwiched between the rubber-like elastic bodies. The present invention relates to an anti-vibration bush that is formed with a pair of positioning holes and is press-fitted into a press-fitting hole of a member to be attached.

  This type of anti-vibration bush is press-fitted into a press-fitting hole of a suspension arm (corresponding to a member to be attached) that supports the wheel of an automobile, and is fixed to a member on the vehicle body side with a fixing bolt inserted into the inner cylinder. In this fixed state, a pair of straight holes formed in the rubber-like elastic body are arranged, for example, in the front-rear direction of the vehicle body. As a result, the spring constant in the front-rear direction is reduced to improve riding comfort, and the spring constant in the left-right direction of the vehicle body is increased to improve steering stability.

  In the case of the above structure, if the direction in which the straight holes are arranged is inclined with respect to the longitudinal direction of the vehicle body, it is difficult to set the spring constant in the longitudinal direction to a target value. Therefore, the vibration isolating bush must be accurately positioned and press-fitted into the press-fitting hole of the arm in the circumferential direction of the press-fitting hole. The above example is an example in which the direction in which the straight holes are arranged matches the longitudinal direction of the vehicle body, but there is also a structure in which the direction in which the straight holes are arranged is along a direction different from the longitudinal direction of the vehicle body. Even in such a structure, the anti-vibration bush must be accurately positioned and press-fitted into the press-fitting hole of the arm in the circumferential direction of the press-fitting hole.

  When press-fitting the vibration-proof bushing into the press-fitting hole of the arm, fit one end of the vibration-proof bushing into the support hole of the press-fitting support jig, and receive the end of the outer cylinder from the lower side in the support jig. Support. Then, the arm held by the holding portion of the press-fitting device is lowered from the upper side of the other end of the vibration-proof bushing, and the arm is press-fitted and fitted into the vibration-proof bush. As a result, the vibration-proof bushing is press-fitted into the press-fitting hole of the arm. The positional relationship between the support jig and the holding part of the press-fitting device is accurately set. If the vibration-proof bushing is accurately placed in the support hole of the support jig in the circumferential direction of the support hole, the vibration-proof bushing It is precisely positioned and press-fitted into the press-fitting hole.

  Conventionally, when positioning the anti-vibration bushing in the circumferential direction with respect to the support hole of the support jig, an operator can place a predetermined position (for example, the circumference of the inner and outer cylinders) on a reference point formed on the support jig. The center of the tick hole in the direction was aligned.

  According to the above-mentioned conventional means, the operator has positioned the predetermined position of the straight hole on the reference point formed on the support jig, so that the position of the vibration isolating bush with respect to the support hole of the support jig is not good. It was sometimes accurate.

An object of the present invention is to provide a method for press- fitting an anti-vibration bush that can be accurately positioned with respect to a support jig and can be press-fitted without being displaced in the press-fitting hole of a member to be attached in the circumferential direction.

A feature of the present invention includes an inner cylinder, an outer cylinder, and a rubber-like elastic body that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder. The inner cylinder is attached to the rubber-like elastic body. It is a method of press-fitting a vibration-proof bush formed with a pair of tick holes positioned between the press-fitting holes of a member to be attached ,
The anti-vibration bush is
The first rubber-like elastic body portion on one end side in the axial direction of the inner and outer cylinders is provided with a pair of first rubber protrusions protruding in the axial direction, and the second rubber-like shape on the other end side in the axial direction. The elastic body portion is provided with a pair of second rubber protrusions protruding in the axial direction,
The first rubber convex portion and the second rubber convex portion are vulcanized and molded integrally with the first rubber-like elastic body portion and the second rubber-like elastic body portion, and the inner cylinder in the radial direction of the inner and outer cylinders Vulcanized and adhered to the outer peripheral surface of the inner cylinder, which is located at the side,
The pair of straight holes are arranged at equal intervals in the circumferential direction of the inner and outer cylinders, and one first rubber convex portion of the pair of first rubber convex portions is arranged in the circumferential direction of one of the straight holes. Provided at a position corresponding to the center, and the other first rubber protrusion is provided at a position corresponding to the circumferential center of the other counterbore, and one second rubber of the pair of second rubber protrusions. The convex portion is provided at a position corresponding to the center in the circumferential direction of the one counterbore, and the other second rubber convex portion is provided at a position corresponding to the center in the circumferential direction of the other counterbore hole,
When the vibration-proof bushing is press-fitted into the press-fitting hole, one end or the other end of the outer cylinder is received and supported in the axial direction by the press-fitting support jig, and at this time, a pair of positioning of the support jig The pair of first rubber protrusions or the pair of second rubber protrusions are individually fitted into holes, and the vibration-proof bushing is positioned in the circumferential direction of the inner and outer cylinders with respect to the support jig. In the supporting state, the outer cylinder of the vibration-proof bushing is press-fitted into the press-fitting hole of the attachment target member .

Thus, in the present invention, when the vibration isolating bush is press-fitted into the press-fitting hole of the member to be attached, one end or the other end of the outer cylinder is received and supported in the axial direction by the press-fitting support jig. At this time, the pair of first rubber convex portions on the first rubber-like elastic body portion side or the pair of second rubber convex portions on the second rubber-like elastic body portion side are respectively inserted into the pair of positioning holes of the support jig. Fit separately. Thereby, the vibration isolating bush can be accurately positioned with respect to the support jig in the circumferential direction of the inner and outer cylinders. In this supported state, the vibration-proof bushing is press-fitted into the press-fitting hole of the attachment target member.

According to the present invention, also, since the first rubber protrusions and the second rubber projections are vulcanized molded integrally with the first rubber-like elastic material portion and a second rubber-like elastic material portion, rubber projection The portion can be made difficult to separate from the first rubber-like elastic body portion and the second rubber-like elastic body portion. Further, since the rubber convex portion is vulcanized and bonded to the outer peripheral surface of the inner cylinder, the rubber convex portion is supported by the inner cylinder, and thus the shape retention of the rubber convex portion can be improved. As a result, the pair of rubber projections can be easily fitted into the pair of positioning holes of the support jig.

In the present invention, the anti-vibration bush is configured such that the inner cylinder is set to be longer than the outer cylinder, and both ends of the inner cylinder protrude outward in the axial direction from both ends of the outer cylinder . One rubber convex portion protrudes axially outward from one end portion of the outer cylinder, and the pair of second rubber convex portions protrudes axially outward from the other end portion of the outer cylinder , One end or the other end of the inner cylinder of the vibration isolating bushing is fitted into the support hole of the support jig, and the one end or the other end of the outer cylinder is received and supported by the support jig in the axial direction. In addition, the first rubber convex portion or the second rubber convex portion arranged so as to be offset toward the inner cylinder side may be fitted into the positioning hole of the support jig. Thereby, it is possible to determine the rubber convex portion by just looking at the anti-vibration bush. Then, the rubber convex portion can be fitted into the positioning hole on the support jig side while looking at the rubber convex portion, and the positioning operation of the vibration isolating bush with respect to the support jig can be simplified.

According to the present invention, it is possible to position the vibration isolating bushing for supporting jig can be accurately press-fitting the vibration isolating bushing without causing displaced in the fitting hole of the mounting object member in the circumferential direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, 2, and 3 show an anti-vibration bush B. The anti-vibration bush B includes a slightly thick inner cylinder 1, a thin outer cylinder 2, and a rubber-like elastic body 3 that is interposed between the inner and outer cylinders 1 and 2 and connects the inner cylinder 1 and the outer cylinder 2. The rubber-like elastic body 3 is formed with a pair of straight holes 4 positioned so as to sandwich the inner cylinder 1 therebetween.

  The anti-vibration bush B having the above structure is press-fitted into a press-fitting hole 6 (see FIGS. 6 and 7) of an arm 5 (corresponding to a member to be attached) of the rear suspension, and a member on the vehicle body side with a fixing bolt inserted into the inner cylinder 1. Fixed to. In this fixed state, the pair of straight holes 4 are arranged in the front-rear direction of the vehicle body. As a result, the spring constant in the front-rear direction is reduced to improve riding comfort, and the spring constant in the left-right direction of the vehicle body is increased to improve steering stability.

  The structure of the vibration-proof bush B will be described in detail. The rubber-like elastic body 3 is vulcanized over the entire circumference between the inner and outer cylinders 1 and 2. The pair of straight holes 4 is set in a circular arc shape in the cross section along the circumferential direction of the inner and outer cylinders 1 and 2. The inner cylinder 1 is set longer than the outer cylinder 2, and both end portions 1 </ b> A and 1 </ b> B of the inner cylinder 1 protrude outward in the axial direction from both end portions 2 </ b> A and 2 </ b> B of the outer cylinder 2. A pair of first rubber projections 8 projecting in the axial direction from the first rubber-like elastic body portion 3A on the side of the one end 1A, 2A in the axial direction of the inner and outer cylinders 1, 2 are provided. A pair of second rubber protrusions 10 are provided that protrude in the axial direction from the second rubber-like elastic body portion 3B on the other end 1B, 2B side in the axial direction. The first rubber convex portion 8 and the second rubber convex portion 10 are integrated with the rubber elastic body 3 by the same rubber compound as the rubber elastic body 3 (that is, the first rubber elastic body portion 3A and the second rubber elastic body 3). It is vulcanized (integrated with the body part 3B).

  The pair of first rubber protrusions 8 protrudes axially outward from the one end 2A of the outer cylinder 2, and the pair of second rubber protrusions 10 is axially outward from the other end 2B of the outer cylinder 2. Protruding. The first rubber convex portion 8 and the second rubber convex portion 10 are offset from the inner cylinder 1 side in the radial direction of the inner and outer cylinders 1 and 2 and are vulcanized and bonded to the outer peripheral surface of the inner cylinder 1.

  The pair of straight holes 4 are arranged at equal intervals in the circumferential direction of the inner and outer cylinders 1, 2, and the pair of first rubber protrusions 8 are arranged at equal intervals in the circumferential direction of the inner and outer cylinders 1, 2. The pair of second rubber projections 10 are arranged at equal intervals in the circumferential direction of the inner and outer cylinders 1 and 2. Of the pair of first rubber protrusions 8, one first rubber protrusion 8 is located at a position corresponding to the center in the circumferential direction of one of the straight holes 4, and the other first rubber protrusion 8 is the other straight hole. 4 of the pair of second rubber protrusions 10, and one of the pair of second rubber protrusions 10 is positioned at a position corresponding to the center of the circumferential direction of one of the straight holes 4. The other second rubber projection 10 is located at a position corresponding to the circumferential center of the other straight hole 4.

  When the vibration isolating bush B is press-fitted into the press-fitting hole 6 of the arm 5, as shown in FIGS. 4, 5 and 6, the anti-vibration is made vertically in the support hole 11 of the press-fitting support jig 7. One end (or the other end) of the bush B is fitted, and the support jig 7 receives and supports the one end 2A (or the other end 2B) of the outer cylinder 2 from below in the axial direction. At this time, the pair of first rubber protrusions 8 (or the pair of second rubber protrusions 10) are fitted into the pair of positioning holes 9 of the support jig 7 separately. Thereby, the vibration isolating bush B can be accurately positioned with respect to the support jig 7 in the circumferential direction of the inner and outer cylinders 1 and 2. 6 and 7, the arm 5 held by the holding portion 13 of the press-fitting device 12 is lowered from the upper side of the other end 2B (or one end 2A) of the outer cylinder 2 to prevent the arm 5. Press fit on the swing bush B. As a result, the vibration-proof bush B is press-fitted into the press-fitting hole 6 of the arm 5. A rod-shaped inner cylinder receiver 14 that is inserted into the inner cylinder 1 is erected on the support jig 7.

  As described above, the pair of first rubber projections 8 are individually fitted into the pair of positioning holes 9 formed in the support jig 7, and the pair of second rubbers are inserted into the pair of positioning holes 9. The convex part 10 is comprised so that it may each fit.

[Another embodiment]
Can be the direction of arrangement of currant hole 4 of a pair is also to apply the present invention to a structure vibration damping bushing along the other direction is press-fitted to the arm 5 to the longitudinal direction of the vehicle body. Above the axially embodiment Ru direction der of arrow J in FIG. 2 as is known.

Top view of anti-vibration bush E-O-E cross section of FIG. Anti-vibration bush perspective view Perspective view of support jig Vertical section of support jig Sectional view showing the first half of the press-fitting process Sectional view showing the latter half of the press-fitting process

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inner cylinder, 1A ... One end part of an inner cylinder, 1B ... Other end part of an inner cylinder, 2 ... Outer cylinder, 2A ... One end part of an outer cylinder, 2B ... Other end part of an outer cylinder, 3 ... rubber-like elastic body, 3A ... first rubber-like elastic body portion on one end side in the axial direction of the inner and outer cylinders, 3B ... second rubber-like elastic body portion on the other end side above the inner and outer cylinders, 4 ... Turning hole, 5 ... Installation target member, 6 ... Press fit hole, 7 ... Support jig, 8 ... Rubber projection, 9 ... Positioning hole, 10 ... Rubber projection, J ... Shaft direction

Claims (2)

An inner cylinder, an outer cylinder, and a rubber-like elastic body that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder, and a pair of rubber cylinders positioned between the inner cylinder and the rubber-like elastic body A method for press-fitting a vibration-proof bush having a straight hole into a press-fitting hole of a member to be mounted ,
The anti-vibration bush is
The first rubber-like elastic body portion on one end side in the axial direction of the inner and outer cylinders is provided with a pair of first rubber protrusions protruding in the axial direction, and the second rubber-like shape on the other end side in the axial direction. The elastic body portion is provided with a pair of second rubber protrusions protruding in the axial direction,
The first rubber convex portion and the second rubber convex portion are vulcanized and molded integrally with the first rubber-like elastic body portion and the second rubber-like elastic body portion, and the inner cylinder in the radial direction of the inner and outer cylinders Vulcanized and adhered to the outer peripheral surface of the inner cylinder, which is located at the side,
The pair of straight holes are arranged at equal intervals in the circumferential direction of the inner and outer cylinders, and one first rubber convex portion of the pair of first rubber convex portions is arranged in the circumferential direction of one of the straight holes. Provided at a position corresponding to the center, and the other first rubber protrusion is provided at a position corresponding to the circumferential center of the other counterbore, and one second rubber of the pair of second rubber protrusions. The convex portion is provided at a position corresponding to the center in the circumferential direction of the one counterbore, and the other second rubber convex portion is provided at a position corresponding to the center in the circumferential direction of the other counterbore hole,
When the vibration-proof bushing is press-fitted into the press-fitting hole, one end or the other end of the outer cylinder is received and supported in the axial direction by the press-fitting support jig, and at this time, a pair of positioning of the support jig The pair of first rubber protrusions or the pair of second rubber protrusions are individually fitted into holes, and the vibration-proof bushing is positioned in the circumferential direction of the inner and outer cylinders with respect to the support jig. Press-fitting the outer cylinder of the vibration-proof bushing into the press-fitting hole of the attachment target member in a supported state;
A method for press-fitting a vibration-proof bushing into a press-fitting hole of a mounting target member . The anti-vibration bush is configured such that the inner cylinder is set to be longer than the outer cylinder, both end portions of the inner cylinder protrude outward in the axial direction from both end portions of the outer cylinder, and the pair of first rubber protrusions Projecting outward in the axial direction from one end of the outer cylinder, and the pair of second rubber projections projecting outward in the axial direction from the other end of the outer cylinder ,
One end or the other end of the inner cylinder of the vibration isolating bushing is fitted in the support hole of the support jig, and the one end or the other end of the outer cylinder is received in the support jig in the axial direction. causes supported, proof of claim 1, wherein fitting the said first rubber protrusions was arranged offset to tube side or the second rubber protrusions in the positioning hole of the support jig How to press-fitting a vibration bush.

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