JP4206871B2 - Mounting structure for supporting member of single cylinder type hydraulic shock absorber - Google Patents

Mounting structure for supporting member of single cylinder type hydraulic shock absorber Download PDF

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JP4206871B2
JP4206871B2 JP2003306529A JP2003306529A JP4206871B2 JP 4206871 B2 JP4206871 B2 JP 4206871B2 JP 2003306529 A JP2003306529 A JP 2003306529A JP 2003306529 A JP2003306529 A JP 2003306529A JP 4206871 B2 JP4206871 B2 JP 4206871B2
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cylinder
shock absorber
piston
hydraulic shock
support member
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亮 松野
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Hitachi Ltd
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Description

本発明は、単筒式油圧緩衝器のシリンダの外周部に各種センサ等の支持部材を取付けるための単筒式油圧緩衝器の支持部材取付構造に関するものである。   The present invention relates to a support member mounting structure for a single cylinder hydraulic shock absorber for mounting support members such as various sensors on the outer periphery of a cylinder of a single cylinder hydraulic shock absorber.

自動車用サスペンション装置等に装着される油圧緩衝器として、例えば図3に示すような単筒式油圧緩衝器が知られている。
単筒式油圧緩衝器１は、有底円筒状のシリンダ2の開口部にロッドガイド3およびオイルシール4が取付けられ、シリンダ2内の底部側に、フリーピストン5が摺動可能に嵌装されている。シリンダ2内は、フリーピストン5によって底部側のガス室6と他端側の油室7とに画成されており、ガス室6には高圧ガスが封入され、油室7には油液が封入されている。 For example, a single cylinder type hydraulic shock absorber as shown in FIG. 3 is known as a hydraulic shock absorber mounted on an automobile suspension device or the like.
The single cylinder type hydraulic shock absorber 1 has a rod guide 3 and an oil seal 4 attached to an opening of a bottomed cylindrical cylinder 2, and a free piston 5 is slidably fitted on the bottom side of the cylinder 2. ing. The cylinder 2 is defined by a free piston 5 into a gas chamber 6 on the bottom side and an oil chamber 7 on the other end side. The gas chamber 6 is filled with high-pressure gas, and the oil chamber 7 is filled with oil liquid. It is enclosed.

シリンダ2の油室7には、ピストン8が摺動可能に嵌装され、このピストン8によって、油室7内がシリンダ上室7Aとシリンダ下室7Bとの2室に画成されている。ピストン8には、ピストンロッド9の一端がナット10によって連結されており、ピストンロッド9の他端側は、ロッドガイド3およびオイルシール4に摺動可能かつ液密的に挿通されて外部へ延出されている。   A piston 8 is slidably fitted in the oil chamber 7 of the cylinder 2, and the piston 8 divides the oil chamber 7 into two chambers, a cylinder upper chamber 7A and a cylinder lower chamber 7B. One end of a piston rod 9 is connected to the piston 8 by a nut 10, and the other end of the piston rod 9 is slidably and liquid-tightly inserted into the rod guide 3 and the oil seal 4 to extend to the outside. Has been issued.

ピストン8には、シリンダ上下室7A,7B間を連通させる伸び側油路11および縮み側油路12が設けられている。伸び側油路11および縮み側油路12には、それぞれ、その油液の流動を制御して減衰力を発生させるオリフィスおよびディスクバルブ等からなる伸び側減衰力発生機構13および縮み側減衰力発生機構14が設けられている。   The piston 8 is provided with an extension side oil passage 11 and a contraction side oil passage 12 that communicate between the cylinder upper and lower chambers 7A and 7B. The extension side oil passage 11 and the compression side oil passage 12 are respectively provided with an extension side damping force generating mechanism 13 and a compression side damping force generation composed of an orifice, a disk valve and the like that control the flow of the oil to generate a damping force. A mechanism 14 is provided.

この構成により、ピストンロッド9の伸び行程時には、シリンダ2内のピストン8の摺動にともない、シリンダ上室7Aの油液がピストン8の伸び側油路11を通ってシリンダ下室7Bへ流れ、伸び側減衰力発生機構13によって減衰力が発生する。また、縮み行程時には、シリンダ下室7Bの油液が縮み側油路13を通ってシリンダ上室7Aへ流れ、縮み側減衰力発生機構14によって減衰力が発生する。このとき、ピストンロッド9の侵入、退出による油室7の容積変化をフリーピストン5が移動してガス室6の高圧ガスを圧縮、膨張することによって補償する。   With this configuration, during the extension stroke of the piston rod 9, as the piston 8 slides in the cylinder 2, the oil in the cylinder upper chamber 7A flows through the extension-side oil passage 11 of the piston 8 to the cylinder lower chamber 7B. A damping force is generated by the extension side damping force generation mechanism 13. Further, during the contraction stroke, the oil in the cylinder lower chamber 7B flows to the cylinder upper chamber 7A through the contraction side oil passage 13, and the contraction side damping force generation mechanism 14 generates a damping force. At this time, the volume change of the oil chamber 7 due to the entry and exit of the piston rod 9 is compensated by the free piston 5 moving and compressing and expanding the high-pressure gas in the gas chamber 6.

シリンダ2の底部には、サスペンションアーム等(図示せず)に連結するための取付アイ15が結合されており、ピストンロッド9の先端部には、車体側に連結するための取付部16が設けられている。シリンダ2の上端側外周部には、車体との間に介装されるサスペンションスプリング(図示せず)を受けるためのスプリングシート17が取付けられている。また、ピストンロッド9には、リバウンドストッパ18が取付けられている。   A mounting eye 15 for coupling to a suspension arm or the like (not shown) is coupled to the bottom of the cylinder 2, and a mounting portion 16 for coupling to the vehicle body side is provided at the tip of the piston rod 9. It has been. A spring seat 17 for receiving a suspension spring (not shown) interposed between the cylinder 2 and the vehicle body is attached to the outer peripheral portion on the upper end side of the cylinder 2. A rebound stopper 18 is attached to the piston rod 9.

単筒式油圧緩衝器1のシリンダ2の外周部には、スプリングシート17のほか、アンチロックブレーキシステム用のセンサ等の外装部品を支持するためのブラケット19(支持部材)が取付けられている。ここで、単筒式油圧緩衝器1は、その外周部にブラケット19等を取付ける場合、シリンダの外側に外筒を有する複筒式油圧緩衝器とは異なり、内部をフリーピストン5及びピストン8が摺動するシリンダ2の外周部にを直接取付けることになるため、その取付構造が問題となる。   In addition to the spring seat 17, a bracket 19 (support member) for supporting exterior parts such as a sensor for an antilock brake system is attached to the outer periphery of the cylinder 2 of the single cylinder hydraulic shock absorber 1. Here, when the bracket 19 or the like is attached to the outer periphery of the single cylinder hydraulic shock absorber 1, unlike the double cylinder hydraulic shock absorber having an outer cylinder on the outer side of the cylinder, a free piston 5 and a piston 8 are provided inside. Since the outer periphery of the sliding cylinder 2 is directly attached, the attachment structure becomes a problem.

図3に示すように、ブラケット19をシリンダ2に直接溶接する場合、溶接によるシリンダ2の変形が問題となるため、ブラケット19の取付位置は、フリーピストン5が摺動しないシリンダ2の下端部付近に限定される。
そこで、図4に示すように、シリンダ2の中央部付近にブラケット19を取付ける場合には、予め円筒状のアウタチューブ20の上端部外周にブラケット19を溶接しておき、アウタチューブ20をシリンダ2に外嵌させ、その下端部をシリンダ2の下端部に溶接する構造が採られている。 As shown in FIG. 3, when the bracket 19 is directly welded to the cylinder 2, deformation of the cylinder 2 due to welding becomes a problem, so the mounting position of the bracket 19 is near the lower end of the cylinder 2 where the free piston 5 does not slide. It is limited to.
Therefore, as shown in FIG. 4, when mounting the bracket 19 near the center of the cylinder 2, the bracket 19 is welded to the outer periphery of the upper end of the cylindrical outer tube 20 in advance, and the outer tube 20 is connected to the cylinder 2 The lower end of the cylinder 2 is welded to the lower end of the cylinder 2.

しかしながら、このようにアウタチューブ20を介してブラケット19をシリンダ2に取付ける構造では、部品点数が増加し、コストが高くなると共に、ばね下重量が増大するという問題を生じる。
なお、特許文献1には、シリンダの下端部にブラケットを直接溶接し、また、シリンダの中間部にアウタチューブを介してばね受けを取付けた単筒式油圧緩衝器が記載されている。
特開２０００−４６０９０号公報 However, in the structure in which the bracket 19 is attached to the cylinder 2 via the outer tube 20 in this way, there are problems that the number of parts increases, the cost increases, and the unsprung weight increases.
Patent Document 1 describes a single-cylinder hydraulic shock absorber in which a bracket is directly welded to a lower end portion of a cylinder, and a spring receiver is attached to an intermediate portion of the cylinder via an outer tube.
JP 2000-46090 A

本発明は、上記の点に鑑みてなされたものであり、部品点数及び重量を増大させることなく、簡単な構造でシリンダの中間部外周に支持部材を取付けることができる単筒式油圧緩衝器の支持部材取付構造を提供することを目的とする。   The present invention has been made in view of the above points, and is a single-cylinder hydraulic shock absorber in which a support member can be attached to the outer periphery of an intermediate portion of a cylinder with a simple structure without increasing the number of parts and weight. An object is to provide a support member mounting structure.

上記の課題を解決するために、請求項1の発明に係る単筒式油圧緩衝器の支持部材取付構造は、フリーピストンによってシリンダ内にガス室と油室とを画成し、ピストンロッドを連結したピストンを前記油室内に嵌装した単筒式油圧緩衝器おける前記シリンダの外周部に外装部品を支持するための支持部材を取付ける構造であって、
前記シリンダ内において、前記ピストン及び前記フリーピストンの摺動領域を限定することにより前記ピストンと前記フリーピストンとの間にこれらが摺動しない非摺動領域を存在させ、該非摺動領域の外周部に前記支持部材を結合することを特徴とする。
また、請求項2の発明に係る単筒式油圧緩衝器の支持部材取付構造は、上記請求項1の構成において、前記シリンダの径方向外側から内側への張出カシメによって前記支持部材を前記シリンダに結合させること特徴とする。 In order to solve the above-mentioned problem, the support structure for supporting a single cylinder hydraulic shock absorber according to the invention of claim 1 defines a gas chamber and an oil chamber in the cylinder by a free piston, and connects the piston rod. A structure in which a support member for supporting an exterior part is attached to the outer peripheral portion of the cylinder in the single cylinder hydraulic shock absorber in which the piston is fitted in the oil chamber,
In said cylinder, said piston and they are in the presence of non-sliding region which does not slide between the free piston and the piston by restricting the sliding area of the free piston, the outer peripheral portion of the non-sliding region The support member is coupled to the above.
Further, in the structure of claim 1, the support member mounting structure of the single cylinder type hydraulic shock absorber according to the invention of claim 2 is configured such that the support member is attached to the cylinder by caulking from the radially outer side to the inner side of the cylinder. It is characterized by being combined with.

請求項1の発明に係る単筒式油圧緩衝器の支持部材取付構造によれば、支持部材の結合によってシリンダの内周面が局部的に変形しても、非摺動領域には、ピストン及びフリーピストンが摺動しないため、これらのシール性を損なうことがないので、支持部材をシリンダの中間部外周に取付けることができる。また、従来のアウタチューブ等の部材を介することなく、支持部材をシリンダに直接結合することができるので、構造が簡単で製造コストが安価であり、ばね下重量が増大することもない。
また、請求項2に係る単筒式油圧緩衝器の支持部材取付構造によれば、さらに、張出カシメ部によってフリーピストンの移動が規制されるので、ピストンとフリーピストンとが衝突することがなく、これらの衝突によるピストンロッドの損傷を防止することができる。 According to the support structure for supporting a single cylinder hydraulic shock absorber according to the invention of claim 1, even if the inner peripheral surface of the cylinder is locally deformed by the connection of the support member, the non-sliding region includes the piston and since free piston does not slide, since it is not a name that impair these sealing property, it is possible to attach the support member to the intermediate portion outer periphery of the cylinder. Further, since the support member can be directly coupled to the cylinder without using a member such as a conventional outer tube, the structure is simple, the manufacturing cost is low, and the unsprung weight does not increase.
Further, according to the support member mounting structure of the single cylinder type hydraulic shock absorber according to claim 2, the movement of the free piston is further restricted by the overhanging caulking portion, so that the piston and the free piston do not collide with each other. The piston rod can be prevented from being damaged by these collisions.

以下、本発明の実施形態を図面に基づいて詳細に説明する。なお、図3及び図4に示す従来例に対して、同様の部分には同一の符号を付して、異なる部分についてのみ詳細に説明する。
本発明の第1実施形態について、図1を参照して説明する。本実施形態に係る単筒式油圧緩衝器1においては、これが装着されるサスペンション装置等によって、ピストンロッド9の伸縮ストローク範囲が規制されている。これにより、シリンダ2内において、ピストン8及びフリーピストン5の摺動領域が限定されており、シリンダ2の中間部に、ピストン8及びフリーピストン5の非摺動領域Aが存在する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 3 and FIG. 4, the same reference numerals are given to the same parts, and only different parts will be described in detail.
A first embodiment of the present invention will be described with reference to FIG. In the single cylinder type hydraulic shock absorber 1 according to the present embodiment, the expansion / contraction stroke range of the piston rod 9 is restricted by a suspension device or the like to which the single cylinder hydraulic shock absorber 1 is attached. Thus, the sliding area of the piston 8 and the free piston 5 is limited in the cylinder 2, and the non-sliding area A of the piston 8 and the free piston 5 exists in the middle part of the cylinder 2.

そして、シリンダ2の非摺動領域Aの外周部に、L字型に折曲された支持部材としてのブラケット21の一側が、プロジェクション溶接によって結合されている。この場合、プロジェクション溶接によって、シリンダ2の内周面が局部的に変形しても、非摺動領域Aには、ピストン8及びフリーピストン5が摺動しないので、これらの移動及びシール性を損なうことがない。これにより、ブラケット21をシリンダ2の中間部外周に取付けることができる。また、従来のアウタチューブ20等の部材を介することなく、ブラケット21をシリンダ2に直接溶接することができるので、構造が簡単で製造コストが安価であり、ばね下重量が増大することもない。   Then, one side of the bracket 21 as a support member bent into an L shape is joined to the outer peripheral portion of the non-sliding region A of the cylinder 2 by projection welding. In this case, even if the inner peripheral surface of the cylinder 2 is locally deformed by projection welding, the piston 8 and the free piston 5 do not slide in the non-sliding region A, so that their movement and sealing performance are impaired. There is nothing. Thereby, the bracket 21 can be attached to the outer periphery of the intermediate portion of the cylinder 2. Further, since the bracket 21 can be directly welded to the cylinder 2 without using a conventional member such as the outer tube 20, the structure is simple, the manufacturing cost is low, and the unsprung weight does not increase.

次に、本発明の第2実施形態について、図2を参照して説明する。本実施形態に係る単筒式油圧緩衝器1は、上記第1実施形態のものと同様、非摺動領域Aを有している。シリンダ2の外周部に取付けられるブラケット22(支持部材)は、シリンダ2の外周部に嵌合される円筒部23と、ABSセンサ等の外装部品を装着するための取付部24とから構成されている。ブラケット22は、シリンダ2の非摺動領域Aに嵌合させた円筒部23を張出カシメによってシリンダ2に結合することによって取付けられている。張出カシメは、ブラケット22の円筒部23とシリンダ2との重合部を外側から塑性変形させて内側に突出させ、これにより、シリンダ2の外周に形成される凹部と円筒部に23の内周に形成される凸部との凹凸嵌合によって、これらを互いに結合させるものである。   Next, a second embodiment of the present invention will be described with reference to FIG. The single cylinder type hydraulic shock absorber 1 according to the present embodiment has a non-sliding region A as in the case of the first embodiment. The bracket 22 (support member) attached to the outer peripheral part of the cylinder 2 is composed of a cylindrical part 23 fitted to the outer peripheral part of the cylinder 2 and an attachment part 24 for attaching exterior parts such as an ABS sensor. Yes. The bracket 22 is attached by connecting the cylindrical portion 23 fitted to the non-sliding region A of the cylinder 2 to the cylinder 2 by overhanging. The overhang caulking causes the overlapping portion of the cylindrical portion 23 and the cylinder 2 of the bracket 22 to be plastically deformed from the outside and protrudes inward, whereby the recess formed on the outer periphery of the cylinder 2 and the inner periphery of the cylindrical portion 23 are These are connected to each other by concave-convex fitting with the convex portions formed in the above.

この場合、張出カシメによって、シリンダ2の内周面に複数の張出カシメ部25が突出することになるが、非摺動領域Aには、ピストン8及びフリーピストン5が摺動しないので、これらの移動及びシール性を損なうことはない。これにより、上記第1実施形態と同様の作用、効果を奏することができる。
また、万一、油室7内の油液が外部へ漏出し又はガス室6へ侵入して、フリーピストン5が非摺動領域A内へ上昇した場合でも、張出カシメ部25によってフリーピストン5の上昇が規制されるので、ピストンロッド9とフリーピストン5とが衝突することがなく、これら衝突による異音の発生やピストンロッド9の損傷等を防止することができる。 In this case, a plurality of overhanging caulking portions 25 project on the inner peripheral surface of the cylinder 2 due to overhanging caulking, but the piston 8 and the free piston 5 do not slide in the non-sliding area A. These movements and sealing properties are not impaired. Thereby, the same operations and effects as those of the first embodiment can be obtained.
Even if the oil in the oil chamber 7 leaks to the outside or enters the gas chamber 6 and the free piston 5 rises into the non-sliding region A, the free piston Since the rise of 5 is restricted, the piston rod 9 and the free piston 5 do not collide, and it is possible to prevent the generation of noise due to the collision, damage to the piston rod 9, and the like.

なお、上述した各実施の形態においては、本発明における支持部材として、センサ等の外装部品を支持するためのブラケットを示したが、本発明は、これに限らず、支持部材としてはスプリングシート等であってもよい。 In each of the above-described embodiments, a bracket for supporting an exterior component such as a sensor is shown as the support member in the present invention. However, the present invention is not limited to this, and the support member may be a spring seat or the like. It may be.

本発明の第1実施形態に係る支持部材が取付けられた単筒式油圧緩衝器の縦断面図である。1 is a longitudinal sectional view of a single cylinder hydraulic shock absorber to which a support member according to a first embodiment of the present invention is attached. 本発明の第2実施形態に係る支持部材が取付けられた単筒式油圧緩衝器の縦断面図である。FIG. 5 is a longitudinal sectional view of a single cylinder hydraulic shock absorber to which a support member according to a second embodiment of the present invention is attached. 従来の溶接によって支持部材が取付けられた単筒式油圧緩衝器の縦断面図である。It is a longitudinal cross-sectional view of the single cylinder type hydraulic shock absorber to which the support member was attached by conventional welding. 従来のアウタチューブを介して支持部材が取付けられた単筒式油圧緩衝器の縦断面図である。It is a longitudinal cross-sectional view of the single cylinder type hydraulic shock absorber to which the support member was attached via the conventional outer tube.

符号の説明Explanation of symbols

1 単筒式油圧緩衝器、2シリンダ、5 フリーピストン、6 ガス室、7 油室、8 ピストン 、9 ピストンロッド、21 ブラケット(支持部材)、A 非摺動領域
1 Single cylinder type hydraulic shock absorber, 2 cylinders, 5 free piston, 6 gas chamber, 7 oil chamber, 8 piston, 9 piston rod, 21 bracket (support member), A non-sliding area

Claims (2)

フリーピストンによってシリンダ内にガス室と油室とを画成し、ピストンロッドを連結したピストンを前記油室内に嵌装した単筒式油圧緩衝器おける前記シリンダの外周部に外装部品を支持するための支持部材を取付ける構造であって、
前記シリンダ内において、前記ピストン及び前記フリーピストンの摺動領域を限定することにより前記ピストンと前記フリーピストンとの間にこれらが摺動しない非摺動領域を存在させ、該非摺動領域の外周部に前記支持部材を結合することを特徴とする単筒式油圧緩衝器の支持部材取付構造。 In order to support exterior parts on the outer periphery of the cylinder in a single cylinder hydraulic shock absorber in which a free piston defines a gas chamber and an oil chamber in the cylinder, and a piston connected with a piston rod is fitted in the oil chamber. It is a structure to attach the support member of,
In said cylinder, said piston and they are in the presence of non-sliding region which does not slide between the free piston and the piston by restricting the sliding area of the free piston, the outer peripheral portion of the non-sliding region A support member mounting structure for a single cylinder type hydraulic shock absorber, wherein the support member is coupled to a single cylinder type hydraulic shock absorber. 前記シリンダの径方向外側から内側への張出カシメによって前記支持部材を前記シリンダに結合させること特徴とする請求項1に記載の単筒式油圧緩衝器の支持部材取付構造。 2. The support structure for supporting a single cylinder type hydraulic shock absorber according to claim 1, wherein the support member is coupled to the cylinder by caulking from the radially outer side to the inner side of the cylinder.
JP2003306529A 2003-08-29 2003-08-29 Mounting structure for supporting member of single cylinder type hydraulic shock absorber Expired - Fee Related JP4206871B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182781A (en) * 2011-05-10 2011-09-14 付德海 Single-cylinder inflatable vibration absorber and application

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DE102005035569A1 (en) * 2005-07-29 2007-02-01 Thyssenkrupp Bilstein Suspension Gmbh Vibration damper with welded fasteners
US7565859B2 (en) 2006-04-25 2009-07-28 Smc Corporation Of America Power clamp with kinetic energy control
JP2010014196A (en) * 2008-07-03 2010-01-21 Kayaba Ind Co Ltd Single cylinder-type hydraulic shock absorber
JP5229618B2 (en) * 2008-07-12 2013-07-03 住友軽金属工業株式会社 Shock absorber and method of manufacturing the shock absorber
JP7275061B2 (en) * 2020-02-06 2023-05-17 日立Astemo株式会社 Cylinder device
KR20240042665A (en) * 2021-10-22 2024-04-02 히다치 아스테모 가부시키가이샤 Manufacturing method of shock absorber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182781A (en) * 2011-05-10 2011-09-14 付德海 Single-cylinder inflatable vibration absorber and application

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