JP2005188602A - Piston structure - Google Patents

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JP2005188602A
JP2005188602A JP2003429856A JP2003429856A JP2005188602A JP 2005188602 A JP2005188602 A JP 2005188602A JP 2003429856 A JP2003429856 A JP 2003429856A JP 2003429856 A JP2003429856 A JP 2003429856A JP 2005188602 A JP2005188602 A JP 2005188602A
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piston
fitting
passage
fitted
passages
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JP4352390B2 (en
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Hirohide Onami
博英 大浪
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the joint strength of members constituting a piston. <P>SOLUTION: This piston structure 1 in split construction is fitted into a cylinder of a hydraulic draft gear or the like. It comprises a first piston half 2 having a mounting opening 4 in the center to which a piston rod is connected and a plurality of inlet passages 5 and a plurality of outlet passages 6 alternately arranged therearound and a second piston half joined thereto. In the piston structure 1, a pair of circular fitting protruded portion 15 and fitted recessed portion 16 are formed in annular dead spaces between each of the inlet passage 5 and the outlet passage 6 and the mounting opening 4 on a joint surface 7 between the first piston half 2 and the second piston half 3. These are mutually pressed in and fitted into to join the first piston half 2 to the second piston half 3. By using the dead spaces, the sizes of the fitting protruded portion 15 and the fitted recessed portion 16 are increased and these joint strength is improved without sacrificing the flow path areas of the inlet passages 5 and the outlet passages 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、油圧緩衝器等のシリンダに嵌装される分割構造のピストン構造体に関するものである。   The present invention relates to a divided piston structure that is fitted into a cylinder such as a hydraulic shock absorber.

一般的に、筒型の油圧緩衝器のシリンダに嵌装されるピストンは、その中心部にピストンロッドの一端部を挿通して連結するための軸方向の貫通孔が設けられ、その貫通孔の周囲に、ピストンの両端面を貫通する複数の油液通路が配置されている。これらの複数の通路は、ピストンを斜めに貫通しており、その入口がピストンの端面の外周側に開口され、出口が反対側の端面の内周側に開口されている。ピストンの両端面には、油液通路の入口と出口との間を通って出口の周りを囲むように環状の弁座が突出され、この弁座に、中央部がクランプされた円板状のディスクバルブが着座されている。そして、油液通路を流通する油液の流れをディスクバルブの開閉によって制御して減衰力を発生させる。   Generally, a piston fitted in a cylinder of a cylindrical hydraulic shock absorber is provided with an axial through-hole for inserting and connecting one end of a piston rod at the center thereof. Around the periphery, a plurality of oil liquid passages penetrating both end faces of the piston are arranged. The plurality of passages obliquely penetrate the piston, the inlet is opened on the outer peripheral side of the piston end face, and the outlet is opened on the inner peripheral side of the opposite end face. On both end faces of the piston, an annular valve seat protrudes between the inlet and outlet of the oil passage and surrounds the outlet, and a disc-like shape with a central portion clamped on the valve seat. Disc valve is seated. Then, the flow of the oil liquid flowing through the oil liquid passage is controlled by opening and closing the disk valve to generate a damping force.

上記のようなピストンを製造する場合、油液通路がピストンを斜めに貫通しているため、機械加工しにくく、また、焼結等による金型成形が非常に困難であり、生産性に問題がある。   When manufacturing the piston as described above, the oil passage is obliquely penetrating the piston, so it is difficult to machine, and it is very difficult to mold by sintering, which causes a problem in productivity. is there.

そこで、従来、例えば特許文献１に記載されているように、ピストンを分割構造とし、外周側の入口通路と内周側の出口通路とが円周方向に交互に配置された２つのピストン半体をだぼピンとだぼ穴との嵌合によって互いに結合する技術が提案されている。なお、
ピストン半体の入口通路と出口通路とは、ピストン半体の結合面に形成された径方向溝を介して互いに連通されている。
特公昭４８−２１３７８号公報 Therefore, conventionally, as described in Patent Document 1, for example, two piston halves in which the piston has a divided structure and the outer peripheral side inlet passage and the inner peripheral side outlet passage are alternately arranged in the circumferential direction. A technique has been proposed in which the dowel pins and dowel holes are coupled to each other by fitting. In addition,
The inlet passage and the outlet passage of the piston half are communicated with each other via a radial groove formed in the coupling surface of the piston half.
Japanese Patent Publication No. 48-21378

この構成により、入口通路及び出口通路をピストンの端面に対して垂直に設けることができるので、焼結等による金型成形によってピストン半体を容易に製造することが可能となり、ピストンの生産性を高めることができる。   With this configuration, the inlet passage and the outlet passage can be provided perpendicular to the end face of the piston, so that it is possible to easily manufacture the piston half body by molding such as sintering, and the productivity of the piston can be reduced. Can be increased.

しかしながら、上記従来の分割構造のピストンでは、次のような問題がある。２つのピストン半体は、複数の油液通路の隙間に配置された小径のだぼピンとだぼ穴との嵌合によって互いに結合されるので、結合強度が低い。だぼピン及びだぼ穴の数を増やすことによって、ある程度結合強度を高めることができるが、位置合せが困難になり、位置決め精度も低下する。また、だぼピン及びだぼ穴の径を大きくすると、油液通路の流路面積を充分大きくとることができなくなるという問題を生じる。特に、ピストン部の油液通路の流量が大きい単筒式油圧緩衝器の場合に問題となる。   However, the conventional split structure piston has the following problems. Since the two piston halves are coupled to each other by fitting a dowel pin with a small diameter disposed in the gap between the plurality of oil passages and dowel holes, the coupling strength is low. By increasing the number of dowel pins and dowel holes, the coupling strength can be increased to some extent, but alignment becomes difficult and the positioning accuracy also decreases. Further, when the diameters of the dowel pins and dowel holes are increased, there arises a problem that the flow passage area of the oil liquid passage cannot be made sufficiently large. This is a problem particularly in the case of a single cylinder type hydraulic shock absorber having a large flow rate in the oil passage of the piston portion.

本発明は、上記の点に鑑みてなされたものであり、結合強度及び生産性を高めることができる分割構造のピストン構造体を提供することを目的とする。   This invention is made | formed in view of said point, and it aims at providing the piston structure of the division structure which can improve joint strength and productivity.

上記の課題を解決するために、請求項１に係る発明は、中心部にピストンロッドの一端部を結合させる取付開口が貫通され、該取付開口の周囲に複数の通路が貫通された略円板状の２つのピストン半体を互いに結合し、前記２つのピストン半体の通路を互いに連通させるようにしたピストン構造体であって、
前記２つのピストン半体の互いの結合面における前記取付開口と前記通路との間に円周方向に沿って延びる円弧状の嵌合凸部及び嵌合凹部を形成し、前記嵌合凸部と前記嵌合凹部との嵌合によって前記２つのピストン半体を互いに結合させることを特徴とする。
請求項２の発明に係るピストン構造体は、上記請求項１の構成において、前記嵌合凸部及び前記嵌合凹部は、円周方向に沿って前記通路の幅を超えて延びていることを特徴とする。
また、請求項３の発明に係るピストン構造体は、上記請求項１又は２の構成において、前記嵌合凸部及び前記嵌合凹部は、側面部にテーパ面を有していることを特徴とする。 In order to solve the above-mentioned problem, the invention according to claim 1 is a substantially circular plate in which a mounting opening for coupling one end of a piston rod to the center is penetrated, and a plurality of passages are penetrated around the mounting opening. A piston structure in which two piston halves are connected to each other, and the passages of the two piston halves communicate with each other;
An arc-shaped fitting convex part and a fitting concave part extending along a circumferential direction are formed between the mounting opening and the passage on the coupling surfaces of the two piston halves, and the fitting convex part The two piston halves are coupled to each other by fitting with the fitting recess.
A piston structure according to a second aspect of the present invention is the piston structure according to the first aspect, wherein the fitting convex portion and the fitting concave portion extend beyond the width of the passage along a circumferential direction. Features.
A piston structure according to a third aspect of the present invention is characterized in that, in the configuration of the first or second aspect, the fitting convex portion and the fitting concave portion have a tapered surface on a side surface portion. To do.

請求項１の発明に係るピストン構造体によれば、ピストンロッドの取付開口と、その周囲に配置された通路との間のデッドスペースを利用して、円弧状の嵌合凸部及び嵌合凹部を設けたことにより、通路の流路面積を犠牲にすることなく結合部の寸法を大きくすることができ、ピストン半体の結合強度を高めることができる。
請求項２の発明に係るピストン構造体によれば、嵌合凸部及び嵌合凹部の寸法が大きくなり、ピストン半体の結合強度が高まる。
また、請求項３の発明に係るピストン構造体によれば、嵌合凸部及び嵌合凹部のテーパ面によって、ピストン半体の結合時の位置決めを容易に行うと共に、位置決め精度を高めることができる。 According to the piston structure of the first aspect of the present invention, the arcuate fitting convex portion and the fitting concave portion are formed by utilizing a dead space between the mounting opening of the piston rod and the passage disposed around the piston rod mounting opening. By providing, the dimension of the coupling portion can be increased without sacrificing the passage area of the passage, and the coupling strength of the piston half can be increased.
According to the piston structure of the invention of claim 2, the dimensions of the fitting convex part and the fitting concave part are increased, and the coupling strength of the piston half is increased.
Further, according to the piston structure of the invention of claim 3, the positioning at the time of coupling of the piston halves can be easily performed and the positioning accuracy can be improved by the tapered surfaces of the fitting convex portion and the fitting concave portion. .

以下、本発明の一実施形態を図面に基づいて詳細に説明する。
図１及び図２に示すように、本実施形態に係るピストン構造体１は、筒型油圧緩衝器のシリンダに嵌装されるものであり、略円板状の第１ピストン半体２と第２ピストン半体３とを互いに結合して構成される２分割構造となっている。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the piston structure 1 according to the present embodiment is fitted into a cylinder of a cylindrical hydraulic shock absorber, and includes a substantially piston-like first piston half 2 and a first piston half body 2. The two-piston half 3 is coupled to each other to form a two-part structure.

第１ピストン半体２は、中心部にピストンロッド（図示せず）の一端部を挿通して結合するための円形の取付開口４が軸方向に貫通されている。開口４の周囲には、複数の入口通路５（通路）及び出口通路６（通路）が周方向に沿って等間隔で交互に配置されて、第１ピストン半体２を軸方向に貫通している。   The first piston half body 2 has a circular mounting opening 4 extending in the axial direction through which one end of a piston rod (not shown) is inserted and coupled to the center. Around the opening 4, a plurality of inlet passages 5 (passages) and outlet passages 6 (passages) are alternately arranged at equal intervals along the circumferential direction, and penetrate the first piston half 2 in the axial direction. Yes.

入口通路５は、ピストン１の端面、すなわち、第１ピストン半体２の第２ピストン半体３との結合面７とは反対側の端面８の外周側に、円周方向に沿って延びる長方形の入口開口９を有している。出口通路６は、端面８の内周側に円形の出口開口１０を有している。端面８には、入口開口９と出口開口１０との間を仕切る環状のシート部１１が突出され、また、取付開口４の周囲に環状のクランプ部１２が突出されている。そして、ディスクバルブ（図示せず）の内周部がクランプ部１２に固定され、外周部がシート部１１に着座される。入口通路５及び出口通路６の結合面７側の開口は、入口開口９と出口開口１０とを組合わせた形状を有する互いに同形状の連通開口１３、１４となっている。   The inlet passage 5 is a rectangular shape extending in the circumferential direction on the outer peripheral side of the end surface 8 of the piston 1, that is, the end surface 8 opposite to the coupling surface 7 of the first piston half 2 with the second piston half 3. Inlet opening 9 is provided. The outlet passage 6 has a circular outlet opening 10 on the inner peripheral side of the end face 8. On the end face 8, an annular sheet portion 11 that partitions between the inlet opening 9 and the outlet opening 10 protrudes, and an annular clamp portion 12 protrudes around the mounting opening 4. The inner peripheral portion of the disc valve (not shown) is fixed to the clamp portion 12 and the outer peripheral portion is seated on the seat portion 11. The openings on the coupling surface 7 side of the inlet passage 5 and the outlet passage 6 are communication openings 13 and 14 having the same shape and a combination of the inlet opening 9 and the outlet opening 10.

第１ピストン半体２の結合面７には、取付開口４と連通開口１３との間の環状の部位に、ピストン半体２と同心に配置された一対の円弧状の嵌合凸部１５及び嵌合凹部１６が形成されている。嵌合凸部１５及び嵌合凹部１６は、互いに圧入、嵌合可能な形状であり、第１ピストン半体２の中心に対して対称位置に配置されており、入口通路５及び出口通路６の幅を超えて円周方向に延ばされている。また、嵌合凸部１５及び嵌合凹部１６の側面部は、テーパ面１５Ａ、１６Ａとなっている。   The coupling surface 7 of the first piston half 2 has a pair of arcuate fitting projections 15 disposed concentrically with the piston half 2 at an annular portion between the mounting opening 4 and the communication opening 13 and A fitting recess 16 is formed. The fitting convex portion 15 and the fitting concave portion 16 are shapes that can be press-fitted and fitted to each other, and are arranged at symmetrical positions with respect to the center of the first piston half body 2. It extends in the circumferential direction beyond the width. Further, the side surfaces of the fitting convex portion 15 and the fitting concave portion 16 are tapered surfaces 15A and 16A.

第１ピストン半体２と第２ピストン半体３とは、同形状であり、結合後に適宜機械加工等が施されて、ピストン構造体１として所定の形状に仕上げられるので、第２ピストン半体３については、上述の第１ピストン半体２に対応する部分には同一の符号を付して説明は省略する。   The first piston half 2 and the second piston half 3 have the same shape, and are appropriately machined after being joined to be finished into a predetermined shape as the piston structure 1. 3, the same reference numerals are given to the portions corresponding to the first piston half 2 described above, and description thereof is omitted.

第１ピストン半体２と第２ピストン半体３とは、結合面７どうしを対向させて、互いの嵌合凸部１５を嵌合凹部１６に圧入、嵌合することによって結合される。これにより、第１ピストン半体２及び第２ピストン半体３のそれぞれの入口通路５と出口通路６とが連通開口１３、１４によって連通されて、ピストン１を軸方向に貫通する油液通路が形成される。   The first piston half body 2 and the second piston half body 3 are coupled by pressing the fitting convex portions 15 into the fitting concave portions 16 and fitting them with the coupling surfaces 7 facing each other. Thereby, the inlet passage 5 and the outlet passage 6 of each of the first piston half 2 and the second piston half 3 are communicated with each other by the communication openings 13 and 14, and the oil liquid passage penetrating the piston 1 in the axial direction is formed. It is formed.

第１ピストン半体２と第２ピストン半体３とを結合した後、適宜機械加工等を施してピストン構造体１を所定の形状に仕上げ、その外周部にピストンリング１７が装着される。そして、取付開口４にピストンロッドの一端部が挿通され、結合され、ピストン１の両端面８のクランプ部１２にディスクバルブが取付けられてシート部１１に着座される。   After the first piston half 2 and the second piston half 3 are coupled, the piston structure 1 is finished into a predetermined shape by appropriate machining or the like, and a piston ring 17 is attached to the outer periphery thereof. Then, one end portion of the piston rod is inserted into the attachment opening 4 and coupled, and a disc valve is attached to the clamp portions 12 on both end faces 8 of the piston 1 and is seated on the seat portion 11.

嵌合凸部１５及び嵌合凹部１６は、入口通路５及び出口通路６と取付開口４との間の環状のデッドスペースに配置され、その円周方向に沿って円弧状に形成されているので、油液通路の流路面積を犠牲にすることなく、充分大きな寸法とすることができるので、圧入による結合強度を高めることができ、結合後の機械加工等によって結合が外れることがない。また、嵌合凸部１５自体の強度が高まるので、圧入時の嵌合凸部１５の損傷を防止することができる。   The fitting convex portion 15 and the fitting concave portion 16 are arranged in an annular dead space between the inlet passage 5 and the outlet passage 6 and the mounting opening 4 and are formed in an arc shape along the circumferential direction thereof. In addition, since the dimensions can be made sufficiently large without sacrificing the flow passage area of the oil liquid passage, the bonding strength by press-fitting can be increased, and the bonding does not come off by machining after the bonding. Further, since the strength of the fitting convex portion 15 itself is increased, it is possible to prevent the fitting convex portion 15 from being damaged during press-fitting.

嵌合凸部１５及び嵌合凹部１６は、第１及び第２ピストン半体２、３と同心に配置され、側面部がテーパ面１５Ａ、１６Ａとなっているので、圧入時に、容易に嵌合させることができ、また、第１ピストン半体２と第２ピストン半体３との中心の位置合せの精度を高めることができる。   The fitting convex portion 15 and the fitting concave portion 16 are arranged concentrically with the first and second piston halves 2 and 3, and the side portions are tapered surfaces 15A and 16A, so that they can be easily fitted during press-fitting. In addition, the accuracy of center alignment between the first piston half 2 and the second piston half 3 can be improved.

また、第１ピストン半体２と第２ピストン半体３とは、同形状であり、焼結等によって容易に金型成形することができるので、製造コストを低減することができる。   Further, the first piston half 2 and the second piston half 3 have the same shape and can be easily molded by sintering or the like, so that the manufacturing cost can be reduced.

なお、上記実施形態では、嵌合凸部１５及び嵌合凹部１６の側面部全体にテーパ面１５Ａ、１６Ａを形成したものを示しているが、本発明は、これに限らず、嵌合凸部１５の先端部及びこれに嵌合する嵌合凹部１６の底部のみにテーパ面１５Ａ、１６Ａを形成し、他の側面部は、結合面７に垂直な形状とするようにしてもよい。この場合、嵌合凸部１５のテーパ面１５Ａによって嵌合作業を容易にすると共に、結合面７に垂直な側面部によって、これらの相互の嵌合強度をさらに高めることができる。   In addition, in the said embodiment, although what formed taper surface 15A, 16A in the whole side part of the fitting convex part 15 and the fitting recessed part 16 is shown, this invention is not restricted to this, A fitting convex part The taper surfaces 15A and 16A may be formed only at the front end portion of 15 and the bottom portion of the fitting recess 16 fitted thereto, and the other side surface portions may be formed in a shape perpendicular to the coupling surface 7. In this case, the fitting operation can be facilitated by the tapered surface 15A of the fitting convex portion 15, and the mutual fitting strength can be further increased by the side surface portion perpendicular to the coupling surface 7.

また、上記実施形態では、本発明を筒型の油圧緩衝器のシリンダに嵌装されるピストンに適用した例について説明しているが、本発明は、これに限らず、他のシリンダに嵌装されるピストンにも同様に適用することができる。   Moreover, although the said embodiment demonstrated the example which applied this invention to the piston fitted to the cylinder of a cylindrical hydraulic shock absorber, this invention is not limited to this and is fitted to another cylinder. The same applies to the pistons to be used.

本発明の一実施形態に係るピストン構造体の縦断面図である。It is a longitudinal cross-sectional view of the piston structure which concerns on one Embodiment of this invention. 図１に示すピストン構造体を構成するピストン半体の平面図である。It is a top view of the piston half which comprises the piston structure shown in FIG.

符号の説明Explanation of symbols

１ ピストン構造体、２ 第１ピストン半体、３ 第２ピストン半体、４ 取付開口、５ 入口通路（通路）、６ 出口通路（通路）、７ 結合面、１５ 嵌合凸部、１６ 嵌合凹部、１５Ａ テーパ面、１６Ａ テーパ面
DESCRIPTION OF SYMBOLS 1 Piston structure, 2 1st piston half body, 3nd piston half body, 4 Mounting opening, 5 Inlet passage (passage), 6 Outlet passage (passage), 7 Connection surface, 15 Fitting convex part, 16 Fitting Recess, 15A taper surface, 16A taper surface

Claims (3)

中心部にピストンロッドの一端部を結合させる取付開口が貫通され、該取付開口の周囲に複数の通路が貫通された略円板状の２つのピストン半体を互いに結合し、前記２つのピストン半体の通路を互いに連通させるようにしたピストン構造体であって、
前記２つのピストン半体の互いの結合面における前記取付開口と前記通路との間に円周方向に沿って延びる円弧状の嵌合凸部及び嵌合凹部を形成し、前記嵌合凸部と前記嵌合凹部との嵌合によって前記２つのピストン半体を互いに結合させることを特徴とするピストン構造体。 An attachment opening for connecting one end of the piston rod is passed through the center, and two substantially disk-shaped piston halves with a plurality of passages around the attachment opening are connected to each other. A piston structure in which body passages communicate with each other;
An arc-shaped fitting convex part and a fitting concave part extending along a circumferential direction are formed between the mounting opening and the passage on the coupling surfaces of the two piston halves, and the fitting convex part A piston structure, wherein the two piston halves are coupled to each other by fitting with the fitting recess. 前記嵌合凸部及び前記嵌合凹部は、円周方向に沿って前記通路の幅を超えて延びていることを特徴とする請求項１に記載のピストン構造体。 The piston structure according to claim 1, wherein the fitting convex portion and the fitting concave portion extend beyond the width of the passage along a circumferential direction. 前記嵌合凸部及び前記嵌合凹部は、側面部にテーパ面を有していることを特徴とする請求項１又は２に記載のピストン構造体。
The piston structure according to claim 1 or 2, wherein the fitting convex part and the fitting concave part have a tapered surface on a side part.
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Cited By (8)

* Cited by examiner, † Cited by third party
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JP2008303927A (en) * 2007-06-06 2008-12-18 Kayaba Ind Co Ltd Piston
EP2009321A2 (en) 2007-06-29 2008-12-31 Hitachi Ltd. Shock absorber
DE102009014907A1 (en) 2008-03-26 2009-10-01 Hitachi, Ltd. Fluid-filled shock absorbers
US20130168195A1 (en) * 2011-12-30 2013-07-04 Mando Corporation Piston assembly of shock absorber
JP2013542388A (en) * 2010-11-09 2013-11-21 ゲーカーエン シンター メタルズ ホールディング ゲーエムベーハー Manufacture of valve components for embedded hydraulic applications that are composed of multiple parts and have a groove shape for embedded sealing
JP2014098444A (en) * 2012-11-15 2014-05-29 Kayaba Ind Co Ltd Shock absorber
KR20170108952A (en) 2015-01-30 2017-09-27 히다치 오토모티브 시스템즈 가부시키가이샤 Fluidic damper
JP7431685B2 (en) 2020-07-03 2024-02-15 カヤバ株式会社 buffer

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008303927A (en) * 2007-06-06 2008-12-18 Kayaba Ind Co Ltd Piston
EP2009321A2 (en) 2007-06-29 2008-12-31 Hitachi Ltd. Shock absorber
KR101559177B1 (en) 2008-03-26 2015-10-12 가부시끼가이샤 히다치 세이사꾸쇼 Hydraulic damper
DE102009014907A1 (en) 2008-03-26 2009-10-01 Hitachi, Ltd. Fluid-filled shock absorbers
DE102009014907B4 (en) 2008-03-26 2024-02-29 Hitachi Astemo, Ltd. Fluid pressure shock absorbers
US8807301B2 (en) 2008-03-26 2014-08-19 Hitachi, Ltd. Fluid pressure shock absorber
JP2013542388A (en) * 2010-11-09 2013-11-21 ゲーカーエン シンター メタルズ ホールディング ゲーエムベーハー Manufacture of valve components for embedded hydraulic applications that are composed of multiple parts and have a groove shape for embedded sealing
US20130168195A1 (en) * 2011-12-30 2013-07-04 Mando Corporation Piston assembly of shock absorber
US9074650B2 (en) * 2011-12-30 2015-07-07 Mando Corporation Piston assembly of shock absorber
JP2014098444A (en) * 2012-11-15 2014-05-29 Kayaba Ind Co Ltd Shock absorber
KR20170108952A (en) 2015-01-30 2017-09-27 히다치 오토모티브 시스템즈 가부시키가이샤 Fluidic damper
US10711860B2 (en) 2015-01-30 2020-07-14 Hitachi Automotive Systems, Ltd. Fluidic damper
JP7431685B2 (en) 2020-07-03 2024-02-15 カヤバ株式会社 buffer

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