JPH06241256A - Tubular vibration control bush - Google Patents

Abstract

PURPOSE:To enable an efficient material taking, and easy manufacture and sufficient strengthening. CONSTITUTION:A holder member 1 has a tubular holding part 11 and it is locked to a car frame by two leg parts 12A and 12B. In addition, an outer cylinder 4 is pressed in and clamped to an inner part of this holding part 11, and a vibrationproof rubber body 3 is formed in this outer cylinder 4. An inner cylinder 2 connecting and supporting a vibrator is pierced through, and embedded in this vibrationproof rubber body 3. In this holding part 11, an intermediate part of a long plate of specified width is formed into a tubular shape, while in the symmetrical leg parts 12A, 12B, both ends of this long plate is bent horizontally more outward than abutting point of the intermediate part formed into a round shape and then further it is formed after being bent toward an outer circumference of the holding part 11, and each of almost triangular spaces S1 and S2 is formed in a gap between both symmetrical circumferences of the holding part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical vibration damping bush, and more particularly to a structural improvement of the cylindrical vibration damping bush which is easy to manufacture and has a good material yield.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a conventional cylindrical vibration-proof bush, and a holder member 1 has a cylindrical holding portion 11 and leg portions 12. The holding portion 11 is formed of a metal pipe having a predetermined length, and the leg portion 12 is formed by cutting out the top surfaces of both side walls of a U-shaped bent metal plate body in an arc shape.
1 is welded to the outer periphery of the lower surface. A vibration-proof rubber body 3 having an inner cylinder 2 penetratingly embedded in the center is injection-molded in an outer cylinder 4, and the outer cylinder 4 is press-fitted and fixed in the holding portion 11. The leg portion 12 is fixed to a vehicle frame (not shown), which is a base body, with a bolt or the like, and a bolt for connecting the engine is inserted into the inner cylinder 2.

However, in such a structure, it is necessary to use a relatively expensive pipe material for the holding portion 11 and to fix the separately manufactured leg portion 12 by welding.

Therefore, for example, Japanese Patent Laid-Open No. 62-110037.
As shown in FIG. 7, the publication discloses a holder member in which a single plate body is press-molded into a substantially U-shape and both side walls 13 having circular openings 131 are used as holding portions. According to this, it is possible to easily and inexpensively manufacture the holder member without using the expensive pipe material and the labor such as welding.

[0005]

However, in the holder member described in the above publication, the unfolded shape on the plate material is relatively complicated as shown in FIG. , The material yield is poor. Further, since the outer cylinder is supported by the thin side walls 13 facing each other with a space, there is a problem that the strength is not sufficient for the vibration input in the cylinder axis direction.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cylindrical vibration-proof bushing that enables efficient material removal, is easy to manufacture, and has sufficient strength.

[0007]

To explain the structure of the present invention, a tubular vibration-proof bush has a tubular holding portion 11 and a leg portion 1.
A holder member 1 fixed to the base body by 2A and 12B;
The holder member 1 is provided with an anti-vibration rubber body 3 in which an inner cylinder 2 for connecting and supporting the vibrating body is embedded. The intermediate portion 51 of the long plate 5 having a constant width is formed into a cylindrical shape to form the holding portion 11, and both end portions 52, 53 of the long plate 5 are formed.
Is bent horizontally outward from the abutting point of the intermediate portion formed into a cylindrical shape, and is further bent toward the outer circumference of the holding portion 11 to form substantially triangular spaces S1 and S2 between the left and right outer circumferences of the holding portion 11, respectively. The legs 12A and 12B are formed.

[0008]

In the above structure, the long plate 5 having a constant width is formed by bending to form the holder member 1. Therefore, the manufacturing is simple, the material is taken without waste, and the material yield can be improved.

Further, since the left and right legs 12A and 12B have a constant width, they have sufficient strength against vibration input from the cylinder axis direction of the holding portion 11 and have a substantially triangular space S.
Since S1 and S2 are formed, they have rigidity even against vibration input from the direction perpendicular to the axis.

[0010]

[Embodiment 1] In FIG. 1, a holder member 1 of an anti-vibration bush comprises a holding portion 11 that is bent and formed into a cylindrical shape, and legs 12A and 12B that are bent and formed at left and right positions of a lower half portion thereof. The leg portions 12A and 12B form substantially triangular spaces S1 and S2 between the leg portion 12A and 12B and the outer circumference of the cylinder of the holding portion 11, respectively.
The lower surfaces of A and 12B are on the same plane. The main body of the vibration-proof bush is formed by injection-molding a vibration-proof rubber body 3 in a large-diameter outer cylinder 4, and the outer cylinder 4 is press-fitted and fixed in the cylinder of the holding portion 11. The vibration-proof rubber body 3 has a small-diameter inner cylinder 2 penetratingly embedded in the center of a bridge portion 31 extending between the upper and lower blind holes 32 and 33. A connecting bolt of an engine is inserted and fixed in the inner cylinder 2, while the holder member 1 has left and right leg portions 12A, 12
It is fixed to the vehicle frame by a weld nut 14 provided at B.

The holder member 1 is molded as follows. That is, a long plate 5 having a constant width as shown in FIG. 2 is prepared, and the weld nut 14 is provided so as to match the mounting holes (not shown) provided on the plate surfaces of both ends 52 and 53. After pressing the intermediate portion 51 of the long plate 5 into a cylindrical shape to form the holding portion 11 (FIG. 3), after bending the abutting portions of the cylinder horizontally outward, from the position where the weld nut 14 is provided. Also, the outer edge is folded back further obliquely upward, and the respective tips are brought into contact with the left and right outer peripheral surfaces of the holding portion 11, respectively.
Then, spot welding is performed on the contact point with the outer peripheral surface and the abutting point.

According to this structure, the holding portion 11 of the holder member 1 and the leg portions 12A and 12B can be integrally formed by pressing, which facilitates manufacturing. Then, the left and right legs 12
Since A and 12B and the holding portion 11 have a constant width, they have sufficient strength even if vibration is input from the holding portion 11 in the cylinder axis direction. Further, since the leg portions 12A and 12B form the substantially triangular spaces S1 and S2, the leg portions 12A and 12B also exhibit durability against vibration input in the direction perpendicular to the axis (the horizontal direction in FIG. 1).

[0013]

[Embodiment 2] The cylindrical vibration-proof bushing shown in FIG. 4 is obtained by injection-molding the vibration-proof rubber body 3 directly into the holding portion 11 without using an outer cylinder. The long plate 5 (FIG. 2) is formed into a U-shape that expands downward as shown by the chain line in the figure, the inner cylinder 2 is positioned, and the vibration-proof rubber body 3 is injection-molded into a predetermined shape. Board 5
Is bent to form legs 12A and 12B.

According to this structure, in addition to the effect of the first embodiment, the number of parts can be reduced, and the press-fitting process of the outer cylinder is not necessary. Furthermore, when the holding portion 11 is formed into a cylindrical shape, the cross-linking portion 31 of the vibration-proof rubber body 3 is compressed from the left and right, and the tensile stress at the time of forming is eliminated, so its durability is improved.

[0015]

As described above, the tubular vibration-proof bushing of the present invention is simple to manufacture, has sufficient strength, and exhibits effective vibration insulation performance.

[Brief description of drawings]

FIG. 1 is a front view of a cylindrical anti-vibration bush showing an embodiment of the present invention.

FIG. 2 is a perspective view of a plate material.

FIG. 3 is a perspective view of a holder member.

FIG. 4 is a front view of a cylindrical vibration damping bush showing another embodiment of the present invention.

FIG. 5 is an overall perspective view of a tubular vibration damping bush showing a conventional example.

FIG. 6 is an exploded perspective view of a tubular vibration damping bush showing a conventional example.

FIG. 7 is a perspective view of a holder member showing another conventional example.

FIG. 8 is a perspective view of a plate material showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder member 11 Holding part 12A, 12B Leg part 2 Inner cylinder 3 Anti-vibration rubber body 4 Outer cylinder 5 Long plate 51 Intermediate part 52,53 Both ends S1, S2 Triangular space

Claims (1)

[Claims] 1. An anti-vibration rubber body having a cylindrical holding portion, a holder member fixed to a base body by a leg portion, and an inner cylinder disposed inside the holder member and connecting and supporting a vibrating body, which is embedded through. In a cylindrical vibration-proof bushing including: a long plate having a constant width is formed into a cylindrical shape to form the holding portion, and both ends of the long plate are abutted with the middle part formed into a cylindrical shape. Cylindrical anti-vibration, characterized in that after bending horizontally outward from the point, it is further bent toward the outer circumference of the holding part to form legs that form a substantially triangular space with the left and right outer circumferences of the holding part. bush.