JP4092271B2 - 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 either (1) a method of forming a long pipe by cutting to a predetermined width, or (2) a method of forming the end portions of plate materials by joining them together by roll processing. It is generally formed, and as the method (2), the method shown in Patent Document 1 can be exemplified.

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.
Japanese Patent Laid-Open No. 8-128485 (FIGS. 2, 3, 5, 6, 6, 7 and 10)

  However, the configuration of Patent Document 1 has the following problems. That is, by fixing the joint portion of the mounting eye to the lower end portion of the hydraulic shock absorber main body, (1) fixing the end portions of the mounting eye to each other, and (2) fixing the mounting eye to the lower end portion of the main body. Since it plays a role, sufficient welding strength is required.

  In order to ensure sufficient welding strength, as shown in FIG. 8, the area of the portion where the joint portion of the plate member 40 is welded to the lower end portion of the hydraulic shock absorber body (hereinafter referred to as the welding area, and in FIG. In this case, it is necessary to secure a long welding surface Q that is a portion surrounded by the circle S among the portions where the end portions of the plate member 40 are joined together. There is.

  However, since the length of the weld surface depends on the shape of the end in the short direction of the plate 40 before roll processing, it is formed so as to be orthogonal to the longitudinal direction of the plate 40 serving as the side edge of the mounting eye. At the end in the short direction, the length of the weld surface cannot be extended unless the width of the mounting eye itself is changed.

  However, the mounting eye is a connecting portion with other members, and in the case of a hydraulic shock absorber, there are many restrictions on the shape and the like, and there is a problem that it is difficult to change the width and the like. Further, even if the width of the mounting eye can be changed, there is a problem that the welding area cannot be increased because there is a restriction on the shape of the hydraulic shock absorber side to which the mounting eye is welded.

  Accordingly, an object of the present invention is to provide a hydraulic shock absorber capable of improving the welding strength by extending the length of the weld surface without particularly changing the shape of the mounting eye or the hydraulic shock absorber side, which is restricted in relation to other members. It is to provide a mounting portion of the vessel.

  In order to achieve the above object, the means of the present invention includes an annular mounting eye formed by joining the end portions of plate members together by roll processing, an annular inner cylinder disposed inside the mounting eye, and these A 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 tip end portion of the piston rod. A counterbored portion that faces each other in opposite directions is formed at each end, and the circumferential seam formed in the circumferential direction or substantially circumferential direction of the mounting eye when each mated counterbored portion is stepped is said hydraulic pressure. It is characterized by being fixed by welding to the lower end of the shock absorber body or the tip of the piston rod.

  In this case, it is preferable that the overlapping surface of the overlapping portion is composed of a vertical surface in the width direction and a horizontal surface in the circumferential direction, and each horizontal surface is used as a circumferential seam portion. Similarly, reinforcement welding may be performed at the intersection between the vertical plane and the horizontal plane. Furthermore, the overlapping surface of each overlapping portion may be composed of an inclined surface along the width direction and an inclined surface along the circumferential direction, and the inclined surface along each circumferential direction may be used as a circumferential seam portion.

  According to the invention of each claim, since welding is performed using a circumferential seam formed in the circumferential direction or substantially in the circumferential direction, the length of the weld surface that affects the strength of the welded portion is determined by the width of the mounting eye, etc. Can be extended without changing the mounting strength, and the mounting strength of the mounting portion can be easily 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 a suspension device for an automobile will be described with reference to the drawings. As shown, 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 coupled by seam welding.

  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 attachment eye 5 is formed in an annular shape by joining the end portions of the plate material by roll processing. More specifically, as shown in FIG. 1, in the state of the plate material, both end portions of the plate material are respectively cut in half. Thus, an overlapped portion facing each other in the opposite direction is formed, and both end portions of the plate material are stepped through the overlapped portion.

  When the counterbored portion is formed, each end portion of the plate material is formed with a counterbored surface composed of vertical planes A and B in the width direction and a horizontal plane C along the circumferential direction. A protrusion 11 is provided, and a recess 12 in which the protrusion 11 is fitted is provided at the other end.

  The protrusion 11 is formed in a rectangular shape including a tip side 11a extending in a direction perpendicular to the side edge 5a of the mounting eye 5, and an outer side 11b and an inner side 11c extending in parallel with the side edge 5a. The recess 12 includes a bottom surface 12a extending in a direction perpendicular to the side edge 5a of the mounting eye 5 and a wall surface 12b extending in parallel with the side edge 5a, and the length of the tip side 11a and the length of the bottom surface 12a. Are set the same.

  In a state where these are fitted, the bottom surface 12a of the recess 12 and the tip side 11a abut, the wall surface 12b and the inner side 11c abut, and one end excluding the protrusion 11 And the other end excluding the concave portion 12 come into contact with each other.

  Further, a circumferential seam portion 14 using the horizontal plane C is formed by contact between the wall surface 12b and the inner side 11c, and one side, that is, vertical surfaces A and B are formed by contact between the bottom surface 12a and the tip side 11a. , And the other widthwise seam portion 16 is formed by contact of one end excluding the protrusion 11 and the other end excluding the recess 12. Has been.

  In addition, the length of the front end side 11a of the protrusion 11 is set to a half length of the width of the mounting eye 5 so that the circumferential seam portion 14 is located at the center of the mounting eye 5 in the width direction. It has become.

  The mounting eye 5 has a substantially central portion of the circumferential seam portion 14 abutted against the central portion of a hook-shaped projection (projection) 9 formed on the lower cap 3, and is attached by electric resistance welding as shown in FIG. The eye 5 and the lower cap 3 are fixed by welding.

  Further, reinforcement welding R using a welding rod is performed between the widthwise seam portion 15 on one side and the widthwise seam portion 16 on the other side of the mounting eye 5 and the lower cap 3. Is welded and fixed at three locations.

  In addition, the welding area S of the three places shown in FIG.

  As described above, according to the present embodiment, when the mounting eye 5 is welded to the lower cap 3, the central portion of the circumferential seam portion 14 of the mounting eye 5 is brought into contact with the protrusion 9 of the lower cap 3, Since this circumferential seam portion 14, one widthwise seam portion 15, and the other widthwise seam portion 15 are welded at three locations, the welding surface Q is ensured longer than the conventional structure and the welding area S is increased. can do.

  Accordingly, the welding strength sufficient to perform the two roles of fixing the ends of the mounting eye 5 and fixing the mounting eye 5 to the lower cap 3 can be easily achieved without particularly changing the width of the mounting eye 5 and the like. Can be improved.

  Further, since the circumferential seam portion 14 of the mounting eye 5 is welded and fixed to the lower cap 3, the above-mentioned seam portion is placed on the axis of the hydraulic shock absorber that is the portion to which the most force is applied to the bush 7 fitted in the mounting eye 5. 14 crosses only one place. Therefore, unlike the conventional structure, there is no fear that the joint portion overlaps on the axis, and the bush 7 is damaged due to the joint portion.

  Further, since the circumferential seam portion 14 is the central portion in the width direction of the mounting eye 5, the general hydraulic shock absorber main body 1 in which the central portion of the projection 9 and the central portion in the width direction of the mounting door 5a are joined. In this mounting structure, welding is easy.

  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 number of welding points between the mounting eye 5 and the lower cap 3 is three, but the present invention is not limited to this, and may be two or one depending on the required strength.

  (2) The combination of the protrusion 11 and the recess 12 may be, for example, as shown in FIG. In this case, although the length of the circumferential seam portion 14 is relatively short, the welding surface can be extended longer than that of the conventional structure, so that, for example, a welding area S as shown in FIG. 5 can be secured, and the welding strength is improved. be able to.

  Further, the size of the protrusion 11 and the recess 12 may be set so that the length of the circumferential seam 14 as shown in FIG. 6 is longer than the width of the mounting eye 5. In this case, for example, a large welding area S can be ensured only at the circumferential seam 14 portion, and the welding strength can be improved similarly. In this case, the welding location may be one location or a plurality of locations.

  Further, as shown in FIG. 7, the counterbored surface is composed of inclined surfaces A1 and B1 along the width direction and inclined surfaces C1 along the circumferential direction, and the inclined surfaces C1 and A1 along the width direction are inclined in the circumferential direction. , The circumferential seam portion 14 and the widthwise seam portions 15 and 16 may be inclined. In this case as well, the same actions and effects as described above are exhibited.

  (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 fixed by welding to the lower end portion 1 of the hydraulic shock absorber main body, but the present invention is not limited to this, and the embodiment is embodied to weld the mounting eye 5 to the tip of the piston rod. May be.

It is a top view which shows the joint part of the attachment eye which shows the best form for implementing this invention. It is a side view which shows the attachment part of the hydraulic shock absorber which shows the best form for implementing this invention. In FIG. 2, it is a partially broken side view which shows a state except an outer cylinder and a bush. It is side surface sectional drawing in FIG. It is a top view which shows another example of this invention and shows the joint part of the attachment eye. It is a top view which shows the other another example of this invention, and shows the joint part of the attachment eye. It is a top view which shows the further another example of this invention, and shows the joint part of the attachment eye. It is a top view which shows the conventional structure and shows the joint part of the attachment eye.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic shock absorber main body 4 Attaching part 5 Attaching eye 6 Inner cylinder 7 Bush 11 Protruding part 11a Tip side 11b Outer side 11c Inner side 12 Recess 12a Bottom face 14 Circumferential seam part P Attaching eye width A, B, vertical plane C Horizontal plane A1, B1 Width direction inclined surface C1 Circumferential direction inclined surface

Claims (4)

A hydraulic shock absorber provided with an annular mounting eye formed by joining the ends of the plate material by roll processing, a similar annular inner cylinder disposed inside the mounting eye, and a bush fitted between them In the mounting part of the hydraulic shock absorber that welds and fixes the joint part of the mounting eye to the lower end of the main body or the tip of the piston rod, the mounting eye is in the state of a plate material, and both ends are facing each other in opposite directions. Formed and welded to the lower end of the main body of the hydraulic shock absorber or the tip of the piston rod, the circumferential seam formed in the circumferential direction or substantially circumferential direction of the mounting eye when each jointed portion is stepped The mounting part of the hydraulic shock absorber characterized by having performed. The mounting portion of the hydraulic shock absorber according to claim 1, wherein the overlapping surface of the overlapping portion is composed of a vertical surface in the width direction and a horizontal surface in the circumferential direction, and each horizontal surface is used as a circumferential seam portion. The mounting portion of the hydraulic shock absorber according to claim 1 or 2, wherein reinforcement welding is performed at a crossing portion between the vertical plane and the horizontal plane. 2. The overlapping surface of each overlapping portion is composed of an inclined surface along the width direction and an inclined surface along the circumferential direction, and the inclined surface along each circumferential direction is used as a circumferential seam portion. Mounting part of hydraulic shock absorber.

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