JP4092274B2 - Hydraulic shock absorber mounting - Google Patents

Description

  The present invention relates to a mounting portion that is welded and fixed to a lower end portion of a hydraulic shock absorber body or a front end portion of a piston rod in a hydraulic shock absorber used in a suspension device of a vehicle such as an automobile. The present invention relates to a structure of a plate winding type mounting eye joined by processing.

  A hydraulic shock absorber used for a suspension device of a vehicle such as an automobile includes an attachment portion as attachment means for attaching to another member at a lower end portion of the hydraulic shock absorber main body or a tip end portion of a piston rod.

  The mounting portion is composed of an annular mounting eye, an inner cylinder arranged inside the mounting eye, and a rubber bush fitted between them, and the hydraulic shock absorber main body lower end or piston rod tip The hydraulic shock absorber is attached to the other member by being welded and fixed to the portion and inserting a connecting member such as a connecting shaft into the inner cylinder.

  The mounting eye constituting the mounting portion is formed by either 1) a method in which a long pipe is cut to a predetermined width, or 2) a method in which the ends of the plate material are joined together by roll processing. The method shown in Patent Document 1 can be exemplified as the method of 2).

That is, a long plate is cut into a predetermined length, and the ends are joined together to form an annular mounting eye, and the joint is welded and fixed to the lower end of the hydraulic shock absorber body. is there.
JP-A-8-128485 (FIGS. 2, 3, 5, 6, 7, and 10)

  However, the configuration of Patent Document 1 has the following problems.

  That is, when forming the mounting eye, a plate material 50 having a constant plate thickness and a rectangular cross section as shown in FIG. 6 is used, so that the upper surface serving as the outer peripheral surface of the mounting eye during the roll processing to bend in the direction indicated by the arrow Q. 51 is pulled in the bending direction, and the lower surface 52 serving as the inner peripheral surface is compressed.

  Therefore, as shown in FIG. 7, the molded mounting eye is a tapered surface in which both side surfaces 53 are close to each other toward the outer peripheral surface (upper surface 51), that is, a tapered surface having an obtuse angle. An acute corner 54 is formed at the boundary between the peripheral surface (lower surface 52) and the side surface 53.

  When the bush 55 is inserted into the mounting eye in this state, the bush 55 comes into pressure contact with the corner portion 54. When stress is concentrated on the pressure contact portion in the operating state of the suspension device, the bush 55 is damaged. It is feared that the durability will decrease.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mounting portion for a hydraulic shock absorber that does not impair the durability of the bush even when stress is concentrated on the boundary portion between the inner peripheral surface and the side surface of the mounting eye.

  In order to achieve the above object, the present invention provides an annular mounting eye formed by joining the short side ends of a plate material by roll processing, and an annular inner cylinder disposed inside the mounting eye. And a bushing fitted between them, and a mounting portion of the hydraulic shock absorber that welds and fixes the joint portion of the mounting eye to the lower end of the hydraulic shock absorber main body or the tip of the piston rod. Both end portions on the longitudinal direction side of the plate material serving as the side surfaces are tapered surfaces having an obtuse slope from the lower surface serving as the inner peripheral surface of the mounting eye toward the upper surface serving as the outer peripheral surface in the state of the plate material before being rolled. It is characterized by this.

  According to the present invention, since there is no acute corner at the boundary between the inner peripheral surface and the side surface of the mounting eye, even if stress is concentrated on the boundary, the pressed bushing is damaged. The durability of the bushing itself can be improved.

  Hereinafter, an embodiment in which the present invention is embodied in a mounting portion of a reverse cylinder type hydraulic shock absorber used in an automobile suspension device will be described with reference to the drawings.

  FIG. 2 shows the lower part of the main body of the hydraulic shock absorber. A lower cap 3 is fitted to the lower end portion of the outer shell 2 constituting the hydraulic shock absorber main body 1, and both are liquid-tightly connected by seam welding. ing.

  The lower cap 3 has a ring-shaped mounting portion 4 fixedly welded to the lower surface of the lower cap 3. The hydraulic shock absorber is connected to the lower end of the piston rod (not shown) extending from the mounting portion 4 and the hydraulic shock absorber body 1. Is attached to the suspension device of the automobile.

  The mounting portion 4 includes an annular mounting eye 5, an inner cylinder 6 disposed inside the mounting eye 5, and a natural or synthetic rubber bush 7 inserted between the inner cylinder 6 and the inner cylinder 6. A connecting shaft or the like (not shown) of the suspension device is inserted into 6.

  The mounting eye 5 is formed in an annular shape by joining the end portions on the short side direction of the plate material by roll processing, and a substantially central portion of the joint portion 14 is formed on the lower cap 3 as shown in FIG. The abutment eye 5 and the lower cap 3 are welded and fixed by electrical resistance welding.

  As shown in FIG. 4, in the state of the plate material 10, the mounting eye 5 has both longitudinal end portions 11 spaced from each other from the lower surface 12 serving as the inner peripheral surface of the mounting eye 5 toward the upper surface 13 serving as the outer peripheral surface. As shown in FIG. 1, the upper surface side is pulled in the longitudinal direction and the lower surface side is compressed during roll processing for bending in the direction indicated by the arrow Q. Further, the side surface 5a of the mounting eye 5 is a plane perpendicular to the inner peripheral surface (lower surface 12).

  As shown in FIG. 1, the bush 7 includes a cylindrical main body 15 and ears 16 projecting in a disc shape on both sides thereof, and the mounting eye 5 is sandwiched between the ears 16. The base portion 16a of the ear portion 16 is pressed against the corner portion 17 that is the boundary portion between the side surface 5a and the inner peripheral surface.

  Therefore, in this state, even if stress concentrates on the pressure contact portion in the operation state of the suspension device, the corner portion 17 is acute, so that the root portion 16a of the bush 7 is damaged and the durability thereof is increased. It is designed not to decrease

  Further, as shown in FIG. 3, a welding rod was used between the outer circumferential surface separated by an arbitrary distance in the circumferential direction that is separated from each other across the joint portion 14 of the mounting eye 5 and the lower cap 3. Reinforcement welding R is performed, and the lower cap 3 is fixed by welding at a total of three locations.

  As described above, according to the present embodiment, the both ends 11 in the longitudinal direction of the plate 10 forming the mounting eye 5 are tapered surfaces that are separated from the lower surface 12 that is the inner peripheral surface of the mounting eye 5 toward the upper surface 13. Therefore, the side surface 5a of the mounting eye 5 by roll processing can be made a plane perpendicular to the inner peripheral surface thereof.

  Therefore, even if the bush 7 is fitted to the mounting eye 5, the root portion 16a of the ear portion 16 of the bush 7 is only pressed against the corner portion 17 which is not an acute angle. Even if stress is concentrated on the portion, the root portion 16a is not damaged and the durability of the bush 7 itself can be improved.

  In addition, since the portion for performing electrical resistance welding and the portion for performing reinforcement welding are dispersed on the outer peripheral surface of the mounting eye 5, heat from the welding is concentrated on the joint portion of the mounting eye 5 as in the prior art. It is possible to prevent the occurrence of general distortion.

  In addition, this invention is not limited to the said embodiment, For example, it can also be changed and embodied as follows.

  1) In the present embodiment, the reinforcement welding R is provided at one location in the circumferential direction away from the joint portion 14 in total, but two locations are provided in total. It is not necessary.

  2) The corner 17 at the boundary between the inner peripheral surface of the mounting eye 5 and the side surface 5a may be an obtuse corner 18 as shown in FIG. 5, for example, in addition to the right angle of the present embodiment. That is, it is only necessary that the bush 7 does not have an acute angle that is easily damaged.

  3) In the present embodiment, the present invention is embodied in the reverse cylinder type hydraulic shock absorber, but is not limited thereto, and may be embodied in a single cylinder type hydraulic shock absorber.

  4) In this embodiment, the mounting eye 5 is welded and fixed to the lower end 1 of the hydraulic shock absorber body. However, the present invention is not limited to this, and the mounting eye 5 is welded to the tip of the piston rod. Also good.

1 is a partially broken side view of a mounting portion of a hydraulic shock absorber showing the best mode for carrying out the present invention. It is a side view in FIG. In FIG. 1, it is a partially broken front view except an inner cylinder and a bush. It is a perspective view which shows the process of roll-processing a board | plate material. It is a partially broken side view of another example of the present invention. It is a perspective view which shows the conventional structure and shows the process of roll-processing a board | plate material. It is a partially broken side view which shows the conventional structure and shows the attachment eye formed at the process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic shock absorber main body 4 Mounting part 5 Mounting eye 5a Side surface 6 Inner cylinder 7 Bush 10 Board | plate material 11 Longitudinal direction side edge part 12 Lower surface 13 Upper surface 14 Seam part

Claims (2)

An annular mounting eye formed by joining ends in the short direction of the plate material by roll processing, a similar inner cylinder disposed inside the mounting eye, and a bush fitted between them In the mounting portion of the hydraulic shock absorber that welds and fixes the joint portion of the mounting eye to the lower end portion of the hydraulic shock absorber main body or the piston rod tip portion, both end portions in the longitudinal direction of the plate material that becomes the side surfaces of the mounting eye by roll processing, A mounting portion of a hydraulic shock absorber, characterized in that a tapered surface having an obtuse angle from the lower surface serving as the inner peripheral surface of the mounting eye toward the upper surface serving as the outer peripheral surface in the state of the plate material before being rolled. 2. The hydraulic shock absorber according to claim 1, wherein a slope angle of the tapered surface is set so that a side surface of the mounting eye becomes a plane perpendicular to the inner peripheral surface when the plate material is rolled into the mounting eye. Mounting part.

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