JP4124415B2

JP4124415B2 - Reinforcement structure of hydraulic shock absorber

Info

Publication number: JP4124415B2
Application number: JP2002017694A
Authority: JP
Inventors: 武夫針ヶ谷; 稔篠塚
Original assignee: Showa Corp
Current assignee: Astemo Ltd
Priority date: 2002-01-25
Filing date: 2002-01-25
Publication date: 2008-07-23
Anticipated expiration: 2022-01-25
Also published as: JP2003222181A

Description

【０００１】
【発明の属する技術分野】
本発明は油圧緩衝器の補強構造に関する。
【０００２】
【従来の技術】
従来の油圧緩衝器は、ダンパチューブの下端部をスピニング加工したり、下端部に底板を溶接することにより底部を形成し、この底部に車軸側取付部となるアイジョイントを溶接して取付けている。そして、ダンパチューブの底部に対するアイジョイントの取付強度を確保するため、実開平3-121245に記載の如く、ダンパチューブの底部をアイジョイントの外形に倣う円弧面としてそれらの溶接面積を大きくし、その溶接強度の増強を図っている。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来技術では、車両の仕様により車量が重くなると、ダンパチューブの底部に対するアイジョイントの取付部に高い応力が集中し、この取付部に必要十分な取付強度を確保できない。このような場合には、ダンパチューブとアイジョイントの肉厚を大きくして強度確保するものとなり、油圧緩衝器の重量が大幅に大きくなり、コスト面でも不利になる。
【０００４】
本発明の課題は、ダンパチューブの底部に対するアイジョイントの取付強度を簡易な構造で補強することにある。
【０００５】
【課題を解決するための手段】
請求項１の発明は、ダンパチューブの下端部に底板を溶接して形成した底部にアイジョイントを溶接した油圧緩衝器の補強構造において、ダンパチューブの側部とアイジョイントの外周部とをつなぐ補強部材を設け、前記補強部材が、ダンパチューブの側部に溶接される保持部と、アイジョイントの外周部に溶接される支持部とを有し、前記保持部がダンパチューブの側部の全周囲に嵌合する嵌合部を備え、前記補強部材における嵌合部の下端側部分はその上端側部分よりも拡径された逃げ部を形成され、逃げ部はダンパチューブの外周との間に隙間を形成してなるものである。
【０００６】
請求項２の発明は、請求項１の発明において更に、前記補強部材における嵌合部の下端側部分には、前記逃げ部がダンパチューブの外周との間に形成する隙間に開口する孔を穿設してなるものである。
【００１５】
【発明の実施の形態】
図１は油圧緩衝器を一部破断して示す正面図、図２は第１実施形態を示し、（Ａ）は正面図、（Ｂ）は側面図、図３は第２実施形態を示し、（Ａ）は正面図、（Ｂ）は側面図、図４は第１参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図、図５は第２参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図、図６は第３参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。
【００１６】
（第１実施形態）（図１、図２）
油圧緩衝器１０は、図１に示す如く、ダンパチューブ１１とダンパロッド１２と懸架ばね１３を有し、ダンパチューブ１１の外周部には下スプリングシート１４を取着し、ダンパロッド１２に上スプリングシート１５を取着し、懸架ばね１３をスプリングシート１４、１５の間に介装している。
【００１７】
油圧緩衝器１０は、ダンパチューブ１１の下部に車軸側取付部１６を設け、ダンパロッド１２に取着してある上スプリングシート１５に車体側取付部１７を備え、車体側取付部１７に取付ボルト１８を取着してある。そして、油圧緩衝器１０は、懸架ばね１３により路面からの衝撃を吸収し、ダンパチューブ１１が内蔵する減衰装置（不図示）により懸架ばね１３の伸縮振動を制振する。
【００１８】
尚、油圧緩衝器１０は、ダンパロッド１２の外端部に挿着したジョイントカラー２１によりワッシャ２２、カバープレート２３を位置決めし、これらのワッシャ２２、カバープレート２３の間にマウントラバー２４Ａ、２４Ｂを設け、このマウントラバー２４Ａ、２４Ｂの間に上スプリングシート１５の基端部１５Ａを挟持した状態で該ダンパロッド１２の上端部に取付ナット２５が螺装される。また、上スプリングシート１５の筒状部１５Ｂが囲むダンパロッド１２まわりにはバンプラバー２６が圧入され、ダンパチューブ１１のダンパロッド１２が貫通している軸封部まわりにはバンプストッパキャップ２７が固定され、バンプストッパキャップ２７にバンプラバー当接板２７Ａを備えている。
【００１９】
また、油圧緩衝器１０は、上スプリングシート１５のばね受部１５Ｃにスプリングラバー２８を介して懸架ばね１３を支持し、上スプリングシート１５とスプリングラバー２８との間にダストカバー２９の取付部２９Ａを挟み込んでいる。
【００２０】
以下、油圧緩衝器１０において、ダンパチューブ１１の下端部に設けた車軸側取付部１６の取付構造について詳述する。
【００２１】
油圧緩衝器１０は、図２に示す如く、ダンパチューブ１１の下端部に底板３１を嵌合し、ダンパチューブ１１の下端部と底板３１の外周を円周状溶接部３２によって溶接することによりダンパチューブ１１の底部１１Ａを形成してある。そして、底部１１Ａの中央部にアイジョイント３３を当接させてこれらを円周状溶接部３４で溶接し、アイジョイント３３の内径部にブッシュ３５を圧入して車軸側取付部１６を形成している。
【００２２】
油圧緩衝器１０は、ダンパチューブ１１の下端部寄りの側部とアイジョイント３３の外周部とをつなぐ補強部材３６を設けている。補強部材３６は、ダンパチューブ１１の側部に溶接部３７で溶接される保持部３６Ａと、アイジョイント３３の外周部に溶接部３８で溶接される支持部３６Ｂとを有する。
【００２３】
補強部材３６の保持部３６Ａは、ダンパチューブ１１の側部の全周囲に嵌合する嵌合部４１を備え、ダンパチューブ１１の外周と嵌合部４１の上端部を円周状溶接部３７によって溶接している。嵌合部４１の上端部側部分はダンパチューブ１１の外周を隙間なく抱持し、ダンパチューブ１１と同芯をなす。
【００２４】
補強部材３６の支持部３６Ｂは、嵌合部４１の下端側部分の直径方向にて相対する２部分から下方に延出される２組の相対する板状部４２、４２からなる。２組の板状部４２の間隔はアイジョイント３３の外径より小さく、両板状部４２の下端部はダンパチューブ１１の軸方向でアイジョイント３３の外周部に突き当てられ、直線状溶接部３８によってアイジョイント３３の外周部に溶接される。
【００２５】
尚、補強部材３６の支持部３６Ｂを構成する両板状部４２の間隔はアイジョイント３３の外径と等しくし、両板状部４２の下端部はアイジョイント３３の直径上でアイジョイント３３の外周部に溶接されても良い。これによれば、アイジョイント３３の取付強度の補強効果を向上できる。
【００２６】
ダンパチューブ１１の下端部は底板３１を溶接した溶接部３２の溶接ビートが該ダンパチューブ１１の外径よりはみ出るから、補強部材３６における嵌合部４１の下端側部分と両板状部４２はその溶接ビードとの干渉を回避するために、嵌合部４１の上端側部分よりも拡径された逃げ部４３を形成する。嵌合部４１の下端側部分には、アイジョイント３３と補強部材３６を溶接したダンパチューブ１１の塗装時に、逃げ部４３がダンパチューブ１１の外周との間に形成する隙間に侵入する塗料の液溜まり防止孔４４を穿設してある。
【００２７】
ダンパチューブ１１への車軸側取付部１６の取付手順は以下の通りになる。
(1)ダンパチューブ１１の底部１１Ａにアイジョイント３３を溶接する。
【００２８】
(2)補強部材３６をダンパチューブ１１の上端部の側から挿入し、補強部材３６の支持部３６Ｂを構成する板状部４２の下端部をアイジョイント３３の外周部に突き当て、補強部材３６を位置決めする。
【００２９】
(3)補強部材３６の保持部３６Ａ（嵌合部４１）をダンパチューブ１１の側部に溶接し、支持部３６Ｂ（板状部４２）をアイジョイント３３の外周部に溶接する。
(4)アイジョイント３３にブッシュ３５を圧入する。
【００３０】
本発明によれば、以下の作用がある。
▲１▼ダンパチューブ１１の底部１１Ａにアイジョイント３３を溶接した上で、ダンパチューブ１１の側部とアイジョイント３３の外周部とを補強部材３６によりつないでいる。補強部材３６は、ダンパチューブ１１の中心軸に対し、ダンパチューブ１１の側部とアイジョイント３３の外周部とをつなぐつなぎ点を、アイジョイント３３とダンパチューブ１１の底部１１Ａとの溶接部よりも外側に配置するものとなり、アイジョイント３３の取付強度を簡易に補強できる。
▲２▼取付部材はダンパチューブ１１自体も補強する。
【００３１】
▲３▼上記▲１▼、▲２▼により、ダンパチューブ１１、アイジョイント３３の肉厚を大きくすることなく、アイジョイント３３の取付強度、ダンパチューブ１１の強度を補強でき、油圧緩衝器１０の重量を大幅に大きくすることがなく、コスト面でも有利になる。
【００３２】
▲４▼補強部材３６は、ダンパチューブ１１の側部とアイジョイント３３の外周部に溶接されてそれらの両者に高い接合強度で接合される。
【００３３】
▲５▼補強部材３６の保持部３６Ａを構成する嵌合部４１がダンパチューブ１１の側部の周囲に嵌合することにより、ダンパチューブ１１自体の補強効果が大きく、ダンパチューブ１１の座屈を防止できる。
【００３４】
▲６▼補強部材３６の支持部３６Ｂがダンパチューブ１１の軸方向でアイジョイント３３の外周部に突き当てられることにより、ダンパチューブ１１とアイジョイント３３に対する補強部材３６の溶接位置を簡易に位置決めできる。
【００３５】
（第２実施形態）（図３）
第２実施形態が第１実施形態と異なる点は、補強部材３６の支持部３６Ｂを構成する両板状部４２の下端部を、アイジョイント３３の外周部の曲面に沿ってアイジョイント３３の直径上まで延在し、両板状部４２の下端部とアイジョイント３３の外周部とを溶接する直線状溶接部３８をアイジョイント３３の直径上で相対する２位置に設けたことにある。
【００３６】
本実施形態によれば、補強部材３６の支持部３６Ｂがアイジョイント３３の外周部の曲面に沿って溶接されることにより、補強部材３６とアイジョイント３３の外周部との溶接部３８に生ずる応力を分散し、強度的に有利になる。
【００３７】
（第１参考形態）（図４）
第１参考形態が第２実施形態と異なる点は、ダンパチューブ１１の下端部をスピニング加工して底部１１Ａを形成したものであり、補強部材３６の嵌合部４１の下端側部分と両板状部４２は第２実施形態の逃げ部４３を形成されず、液溜まり防止孔４４も穿設されない。
【００３８】
（第２参考形態）（図５）
第２参考形態が第２実施形態と異なる点は、補強部材３６を２枚の相対する板材５１、５１により構成したことにある。両板材５１の上端側部分は、補強部材３６の保持部３６Ａを構成し、ダンパチューブ１１の直径上で相対する両側部に円弧状溶接部３７により溶接される。
【００３９】
両板材５１の下端側部分は、補強部材３６の支持部３６Ｂを構成し、アイジョイント３３の外周部の曲面に沿ってアイジョイント３３の直径上まで延在し、アイジョイント３３の直径上で相対する２位置に直線状溶接部３８により溶接される。両板材５１の中間部は、ダンパチューブ１１の下端部に底板３１を溶接した溶接部３２の溶接ビードを回避するための逃げ部５２、塗料の液溜まり防止孔５３を備える。
【００４０】
（第３参考形態）（図６）
第３参考形態が第２参考形態と異なる点は、第２参考形態における２枚の相対する板材５１、５１の各下端部をアイジョイント３３の下側外周部に沿う半円部によりつないだ１枚のＵ字状板材６１とし、この板材６１を補強部材３６としたことにある。
【００４１】
Ｕ字状板材６１の両端部たる２つの上端部は、補強部材３６の保持部３６Ａを構成し、ダンパチューブ１１の直径上で相対する両側部に円弧状溶接部３７によりに溶接される。Ｕ字状板材６１の略半円周状下端部は、補強部材３６の保持部３６Ｂを構成し、アイジョイント３３の略下半周に密着して該アイジョイント３３の外周部に沿う円弧状溶接部３８によりアイジョイント３３の外周部に溶接される。Ｕ字状板材６１において、ダンパチューブ１１の両側部に溶接された両上端部とアイジョイント３３の外周部に溶接された略半円周状下端部との中間部は、ダンパチューブ１１の下端部に底板３１を溶接した溶接部３２の溶接ビードを回避するための逃げ部６２、塗料の液溜まり防止孔６３を備える。
【００４２】
以上、本発明の実施の形態を図面により詳述したが、本発明の具体的な構成はこの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。
【００４３】
【発明の効果】
以上のように本発明によれば、ダンパチューブの底部に対するアイジョイントの取付強度を簡易な構造で補強することができる。
【図面の簡単な説明】
【図１】図１は油圧緩衝器を一部破断して示す正面図である。
【図２】図２は第１実施形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。
【図３】図３は第２実施形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。
【図４】図４は第１参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。
【図５】図５は第２参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。
【図６】図６は第３参考形態を示し、（Ａ）は正面図、（Ｂ）は側面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for a hydraulic shock absorber.
[0002]
[Prior art]
A conventional hydraulic shock absorber is formed by spinning a lower end portion of a damper tube or welding a bottom plate to the lower end portion and welding and attaching an eye joint as an axle side attachment portion to the bottom portion. . And, in order to secure the mounting strength of the eye joint to the bottom of the damper tube, as described in Japanese Utility Model Publication No. Hei 3-121245, the bottom of the damper tube is made into an arc surface that follows the outer shape of the eye joint, and their welding area is increased. We are trying to increase the welding strength.
[0003]
[Problems to be solved by the invention]
However, in the prior art, when the vehicle weight increases due to the vehicle specifications, high stress concentrates on the eye joint attachment portion with respect to the bottom portion of the damper tube, and a necessary and sufficient attachment strength cannot be ensured in this attachment portion. In such a case, the thickness of the damper tube and the eye joint is increased to ensure the strength, and the weight of the hydraulic shock absorber is greatly increased, which is disadvantageous in terms of cost.
[0004]
An object of the present invention is to reinforce the attachment strength of an eye joint to the bottom of a damper tube with a simple structure.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a reinforcement structure for a hydraulic shock absorber in which an eye joint is welded to a bottom portion formed by welding a bottom plate to a lower end portion of a damper tube, and reinforcement that connects a side portion of the damper tube and an outer peripheral portion of the eye joint. A holding portion welded to the side portion of the damper tube and a support portion welded to the outer peripheral portion of the eye joint, and the holding portion is all around the side portion of the damper tube. And a lower end side portion of the fitting portion in the reinforcing member is formed with an escape portion whose diameter is larger than that of the upper end side portion, and the escape portion is a gap between the outer periphery of the damper tube. Is formed .
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, a hole that opens in a gap formed between the relief portion and the outer periphery of the damper tube is formed in a lower end side portion of the fitting portion in the reinforcing member. it is those formed by set.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 is a partially cutaway front view of a hydraulic shock absorber, FIG. 2 shows a first embodiment, (A) is a front view, (B) is a side view, and FIG. 3 shows a second embodiment. (A) is a front view, (B) is a side view, FIG. 4 shows a first reference form, (A) is a front view, (B) is a side view, and FIG. 5 shows a second reference form. ) Is a front view, (B) is a side view, FIG. 6 is a third reference embodiment, (A) is a front view, and (B) is a side view.
[0016]
First Embodiment (FIGS. 1 and 2)
As shown in FIG. 1, the hydraulic shock absorber 10 includes a damper tube 11, a damper rod 12, and a suspension spring 13. A lower spring seat 14 is attached to the outer periphery of the damper tube 11, and an upper spring is attached to the damper rod 12. A seat 15 is attached, and a suspension spring 13 is interposed between the spring seats 14 and 15.
[0017]
The hydraulic shock absorber 10 is provided with an axle-side mounting portion 16 at the lower portion of the damper tube 11, an upper spring seat 15 attached to the damper rod 12 is provided with a vehicle body-side mounting portion 17, and mounting bolts are mounted on the vehicle body-side mounting portion 17. 18 is attached. The hydraulic shock absorber 10 absorbs the impact from the road surface by the suspension spring 13 and suppresses the expansion and contraction vibration of the suspension spring 13 by a damping device (not shown) built in the damper tube 11.
[0018]
The hydraulic shock absorber 10 positions the washer 22 and the cover plate 23 by the joint collar 21 inserted into the outer end portion of the damper rod 12, and mount rubbers 24 A and 24 B are provided between the washer 22 and the cover plate 23. A mounting nut 25 is screwed to the upper end portion of the damper rod 12 with the base end portion 15A of the upper spring seat 15 sandwiched between the mount rubbers 24A, 24B. A bump rubber 26 is press-fitted around the damper rod 12 surrounded by the cylindrical portion 15B of the upper spring seat 15, and a bump stopper cap 27 is fixed around the shaft seal portion through which the damper rod 12 of the damper tube 11 passes. The bump stopper cap 27 is provided with a bump rubber contact plate 27A.
[0019]
Further, the hydraulic shock absorber 10 supports the suspension spring 13 via the spring rubber 28 on the spring receiving portion 15 C of the upper spring seat 15, and the attachment portion 29 A of the dust cover 29 between the upper spring seat 15 and the spring rubber 28. Is sandwiched.
[0020]
Hereinafter, in the hydraulic shock absorber 10, the mounting structure of the axle side mounting part 16 provided in the lower end part of the damper tube 11 is explained in full detail.
[0021]
As shown in FIG. 2, the hydraulic shock absorber 10 has a bottom plate 31 fitted to the lower end portion of the damper tube 11, and the lower end portion of the damper tube 11 and the outer periphery of the bottom plate 31 are welded by a circumferential welding portion 32. A bottom 11A of the tube 11 is formed. Then, the eye joint 33 is brought into contact with the center portion of the bottom portion 11A and these are welded by the circumferential welded portion 34, and the bush 35 is press-fitted into the inner diameter portion of the eye joint 33 to form the axle side mounting portion 16. Yes.
[0022]
The hydraulic shock absorber 10 is provided with a reinforcing member 36 that connects the side portion near the lower end portion of the damper tube 11 and the outer peripheral portion of the eye joint 33. The reinforcing member 36 includes a holding portion 36 A that is welded to the side portion of the damper tube 11 by a welding portion 37, and a support portion 36 B that is welded to the outer peripheral portion of the eye joint 33 by a welding portion 38.
[0023]
The holding portion 36 A of the reinforcing member 36 includes a fitting portion 41 that fits all around the side portion of the damper tube 11, and the outer periphery of the damper tube 11 and the upper end portion of the fitting portion 41 are connected by a circumferential welded portion 37. Welding. The upper end portion side portion of the fitting portion 41 holds the outer periphery of the damper tube 11 without a gap and is concentric with the damper tube 11.
[0024]
The support portion 36 B of the reinforcing member 36 includes two sets of opposed plate-like portions 42 and 42 that extend downward from two portions opposed in the diameter direction of the lower end side portion of the fitting portion 41. The distance between the two sets of plate-like portions 42 is smaller than the outer diameter of the eye joint 33, and the lower ends of both plate-like portions 42 are abutted against the outer peripheral portion of the eye joint 33 in the axial direction of the damper tube 11. It welds to the outer peripheral part of the eye joint 33 by 38.
[0025]
The interval between both plate-like portions 42 constituting the support portion 36B of the reinforcing member 36 is made equal to the outer diameter of the eye joint 33, and the lower end portion of both plate-like portions 42 is above the diameter of the eye joint 33 and You may weld to an outer peripheral part. According to this, the reinforcement effect of the attachment strength of the eye joint 33 can be improved.
[0026]
The lower end portion of the damper tube 11 has a welding beat of the welded portion 32 where the bottom plate 31 is welded protrudes from the outer diameter of the damper tube 11. In order to avoid interference with the weld bead, the escape portion 43 having a diameter larger than that of the upper end side portion of the fitting portion 41 is formed. In the lower end portion of the fitting portion 41, the coating liquid enters the clearance formed between the escape portion 43 and the outer periphery of the damper tube 11 when the damper tube 11 welded with the eye joint 33 and the reinforcing member 36 is painted. A pool prevention hole 44 is formed.
[0027]
The attachment procedure of the axle side attachment portion 16 to the damper tube 11 is as follows.
(1) The eye joint 33 is welded to the bottom 11A of the damper tube 11.
[0028]
(2) The reinforcing member 36 is inserted from the upper end side of the damper tube 11, and the lower end portion of the plate-like portion 42 constituting the supporting portion 36 B of the reinforcing member 36 is abutted against the outer peripheral portion of the eye joint 33. Positioning.
[0029]
(3) The holding portion 36A (fitting portion 41) of the reinforcing member 36 is welded to the side portion of the damper tube 11, and the support portion 36B (plate-like portion 42) is welded to the outer peripheral portion of the eye joint 33.
(4) Press the bush 35 into the eye joint 33.
[0030]
The present invention has the following effects.
(1) After the eye joint 33 is welded to the bottom portion 11A of the damper tube 11, the side portion of the damper tube 11 and the outer peripheral portion of the eye joint 33 are connected by the reinforcing member 36. The reinforcing member 36 has a connecting point that connects the side portion of the damper tube 11 and the outer periphery of the eye joint 33 with respect to the central axis of the damper tube 11, rather than a welded portion between the eye joint 33 and the bottom portion 11 A of the damper tube 11. It becomes what is arrange | positioned outside and can reinforce the attachment strength of the eye joint 33 easily.
(2) The mounting member also reinforces the damper tube 11 itself.
[0031]
(3) By the above (1) and (2), the mounting strength of the eye joint 33 and the strength of the damper tube 11 can be reinforced without increasing the thickness of the damper tube 11 and the eye joint 33. There is no significant increase in weight, which is advantageous in terms of cost.
[0032]
(4) The reinforcing member 36 is welded to the side portion of the damper tube 11 and the outer peripheral portion of the eye joint 33, and is joined to both of them with high joint strength.
[0033]
(5) When the fitting portion 41 constituting the holding portion 36A of the reinforcing member 36 is fitted around the side portion of the damper tube 11, the damper tube 11 itself has a great reinforcing effect, and the damper tube 11 is buckled. Can be prevented.
[0034]
(6) By supporting the support portion 36B of the reinforcing member 36 against the outer peripheral portion of the eye joint 33 in the axial direction of the damper tube 11, the welding position of the reinforcing member 36 with respect to the damper tube 11 and the eye joint 33 can be easily positioned. .
[0035]
Second Embodiment (FIG. 3)
The second embodiment differs from the first embodiment in that the lower ends of both plate-like portions 42 constituting the support portion 36B of the reinforcing member 36 are arranged with the diameter of the eye joint 33 along the curved surface of the outer peripheral portion of the eye joint 33. The linear welded portion 38 that extends to the top and welds the lower end portions of the two plate-like portions 42 and the outer peripheral portion of the eye joint 33 is provided at two opposite positions on the diameter of the eye joint 33.
[0036]
According to the present embodiment, the stress generated in the welded portion 38 between the reinforcing member 36 and the outer peripheral portion of the eye joint 33 by welding the support portion 36B of the reinforcing member 36 along the curved surface of the outer peripheral portion of the eye joint 33. Is dispersed, which is advantageous in terms of strength.
[0037]
(First Reference Form) (FIG. 4)
The difference between the first reference embodiment and the second embodiment is that the lower end portion of the damper tube 11 is processed by spinning to form the bottom portion 11A. The portion 42 does not form the escape portion 43 of the second embodiment, and the liquid pool preventing hole 44 is not formed.
[0038]
( Second reference form) (FIG. 5)
The second reference embodiment is different from the second embodiment in that the reinforcing member 36 is constituted by two opposing plate members 51 and 51. The upper end portions of both plate members 51 constitute a holding portion 36 A of the reinforcing member 36, and are welded to the opposite side portions on the diameter of the damper tube 11 by arc-shaped welding portions 37.
[0039]
The lower end side portions of both plate members 51 constitute a support portion 36B of the reinforcing member 36, extend to the diameter of the eye joint 33 along the curved surface of the outer peripheral portion of the eye joint 33, and are relative to each other on the diameter of the eye joint 33. The two welded positions are welded by the linear welded portion 38. An intermediate portion of both plate members 51 includes a relief portion 52 for avoiding a weld bead of the weld portion 32 in which the bottom plate 31 is welded to the lower end portion of the damper tube 11, and a liquid pool prevention hole 53.
[0040]
( 3rd reference form) (FIG. 6)
The third reference embodiment differs from the second reference embodiment, was connected by semicircular portions along the respective lower ends of the two opposing plate members 51, 51 in the second reference embodiment in the lower outer peripheral portion of the eye joint 33 1 One U-shaped plate material 61 is used as the reinforcing member 36.
[0041]
Two upper end portions which are both ends of the U-shaped plate material 61 constitute a holding portion 36 A of the reinforcing member 36, and are welded to the opposite side portions on the diameter of the damper tube 11 by arc-shaped welding portions 37. A substantially semicircular lower end portion of the U-shaped plate material 61 constitutes a holding portion 36B of the reinforcing member 36, is in close contact with the substantially lower half circumference of the eye joint 33, and is an arc-shaped weld portion along the outer circumference of the eye joint 33. It welds to the outer peripheral part of the eye joint 33 by 38. In the U-shaped plate member 61, an intermediate portion between both upper end portions welded to both side portions of the damper tube 11 and a substantially semicircular lower end portion welded to the outer peripheral portion of the eye joint 33 is a lower end portion of the damper tube 11. Are provided with an escape portion 62 for avoiding a weld bead of the weld portion 32 to which the bottom plate 31 is welded, and a paint liquid pool preventing hole 63.
[0042]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
[0043]
【The invention's effect】
As described above, according to the present invention, the attachment strength of the eye joint to the bottom of the damper tube can be reinforced with a simple structure.
[Brief description of the drawings]
FIG. 1 is a front view showing a hydraulic shock absorber partially broken.
2A and 2B show a first embodiment, in which FIG. 2A is a front view and FIG. 2B is a side view.
FIG. 3 shows a second embodiment, where (A) is a front view and (B) is a side view.
4A and 4B show a first reference embodiment, where FIG. 4A is a front view and FIG. 4B is a side view.
5A and 5B show a second reference embodiment, where FIG. 5A is a front view and FIG. 5B is a side view.
6A and 6B show a third reference embodiment, where FIG. 6A is a front view, and FIG. 6B is a side view.

Claims

In the reinforcement structure of the hydraulic shock absorber in which the eye joint is welded to the bottom formed by welding the bottom plate to the lower end of the damper tube,
A reinforcing member is provided to connect the side of the damper tube and the outer periphery of the eye joint,
The reinforcing member has a holding portion welded to the side portion of the damper tube, and a support portion welded to the outer peripheral portion of the eye joint ,
The holding portion includes a fitting portion that fits around the entire side of the damper tube,
The lower end side portion of the fitting portion in the reinforcing member is formed with a relief portion whose diameter is larger than that of the upper end side portion, and the escape portion is formed with a gap between the outer periphery of the damper tube. Reinforced structure of hydraulic shock absorber.

The reinforcement of the hydraulic shock absorber according to claim 1, wherein a hole that opens in a gap formed between the relief portion and the outer periphery of the damper tube is formed in a lower end side portion of the fitting portion in the reinforcing member. Construction.