JPH0842518A - Cushion device for pressure fluid cylinder - Google Patents

Cushion device for pressure fluid cylinder

Info

Publication number
JPH0842518A
JPH0842518A JP23782195A JP23782195A JPH0842518A JP H0842518 A JPH0842518 A JP H0842518A JP 23782195 A JP23782195 A JP 23782195A JP 23782195 A JP23782195 A JP 23782195A JP H0842518 A JPH0842518 A JP H0842518A
Authority
JP
Japan
Prior art keywords
damper
rod
cylinder
shaped rubber
insertion hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP23782195A
Other languages
Japanese (ja)
Other versions
JP2723091B2 (en
Inventor
Mitsuo Noda
光雄 野田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howa Machinery Ltd
Original Assignee
Howa Machinery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Howa Machinery Ltd filed Critical Howa Machinery Ltd
Priority to JP23782195A priority Critical patent/JP2723091B2/en
Publication of JPH0842518A publication Critical patent/JPH0842518A/en
Application granted granted Critical
Publication of JP2723091B2 publication Critical patent/JP2723091B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Actuator (AREA)

Abstract

PURPOSE:To improve the durability of a rubber damper in a cushion device of a cylinder which uses a rubber damper. CONSTITUTION:A stapped damper insertion hole 29 is formed on a cylinder cap 7, toward a piston end 13. A tapered and stepped bar-like rubber damper 37 is fitted to the damper insertion hole 29 with a sufficient margin in a diameter direction and prevented from escaping in an axial direction. A leading end chamfered portion 41 is projected into a cylinder chamber 9. When the piston end 13 abuts against the chamfered portion 41 at a stroke end, the chamfered portion 41 is pushed into a small diameter hole 35 of the damper insertion hole 31. The bar-like rubber damper 37, being widened in a diameter direction, is not interfered by the edge of the small diameter hole 35, thus the rubber damper 37 is not damaged.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は圧流体シリンダのク
ッション装置に関し、特に、緩衝部材を用いたものに関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion device for a pressure fluid cylinder, and more particularly to a cushion device using a cushioning member.

【0002】[0002]

【従来の技術】上述のようなクッション装置には、例え
ば、シリンダチュ−ブ両端に嵌装されたシリンダカバ
−内部端周面に形成されたアリ溝に、このアリ溝が成す
容積より少許大なる体積の緩衝材が嵌装されているもの
(実公昭61−16409号)、外側シリンダの内側
に内側シリンダが嵌装された2重シリンダの緩衝装置で
あって、その内側シリンダの底板を貫通して貫通孔を設
け、その貫通孔にゴムなどから成る緩衝部材を入れ、そ
の緩衝部材の上下に断面凸形状のパッド部材を配置し、
これら上下のパッド部材の突起部を、底板に固着した上
下のプレート中心の通孔から、夫々外側シリンダのシリ
ンダ室と、内側シリンダのシリンダ室へ突出させたもの
(実公昭61−28898号)などがある。
2. Description of the Related Art In a cushion device as described above, for example, a dovetail groove formed on an inner peripheral surface of a cylinder cover fitted to both ends of a cylinder tube has a volume larger than the volume of the dovetail groove. A shock absorber of a double cylinder in which an inner cylinder is fitted inside the outer cylinder, and a shock absorber having a volume equal to that of the inner cylinder is penetrated through the bottom plate of the inner cylinder. A through hole is provided, a cushioning member made of rubber or the like is inserted into the through hole, and pad members having a convex cross section are arranged above and below the cushioning member,
The projections of these upper and lower pad members are projected into the cylinder chamber of the outer cylinder and the cylinder chamber of the inner cylinder, respectively, from through holes in the center of the upper and lower plates that are fixed to the bottom plate.
(Jitsuko Sho 61-28898).

【0003】[0003]

【発明が解決しようとする課題】前記によれば、緩衝
材がアリ溝にきっちりと嵌装されているために、特に小
径のシリンダにおいては、ピストンの圧縮力による緩衝
材の変形可能な量は軸方向にも径方向にも極めて僅かで
あり、従って、無負荷時のシリンダカバ−端面よりのは
み出し量は極めて僅かであってピストンのクッションス
トロ−クは必然的に小さくならざるを得ない。そのた
め、ピストンの推力、慣性エネルギ−を十分吸収でき
ず、クッション時に大きな衝撃を生じるおそれがある。
しかし、従来のピストンロッドを有するシリンダではシ
リンダ自体の安全率が大きく(一般に50〜100
倍)、前述のように大きな衝撃が生じても事故や破損は
あまり無く、あるいは耐久性にもさほど影響がなかった
が、それにしてもこのような大きな衝撃が加わることは
好ましいことではない。また、前記において、パット
部材は金属、あるいは、半硬質のゴム、樹脂などで別体
に形成したり、緩衝部材と一体に形成したりしている
が、特に、緩衝部材とパッド部材をゴムで一体に形成し
たとき、パッド部材を抜止めしているプレート中心の通
孔からシリンダ室へ突出しているパッド部材の突起部
も、ピストンなどの衝撃により圧縮変形し、この圧縮に
より直径方向にもふくらむので、プレート中心の孔の縁
においてシリンダ室側で半径方向外側につぶれてひっか
かり、パッド部材を傷める問題があった。
According to the above, since the cushioning material is fitted tightly in the dovetail groove, the deformable amount of the cushioning material due to the compressive force of the piston is small, especially in a small diameter cylinder. It is extremely small in both the axial direction and the radial direction. Therefore, the amount of protrusion from the end surface of the cylinder cover when there is no load is very small, and the cushion stroke of the piston is inevitably small. Therefore, the thrust force and inertial energy of the piston cannot be sufficiently absorbed, and a large impact may occur during cushioning.
However, in a cylinder having a conventional piston rod, the safety factor of the cylinder itself is large (generally 50 to 100).
However, even if a large impact is generated as described above, there are few accidents and damages, or the durability is not so affected, but it is not preferable to apply such a large impact. Further, in the above, the pad member is formed separately from metal, semi-hard rubber, resin or the like, or is formed integrally with the cushioning member, but in particular, the cushioning member and the pad member are made of rubber. When formed integrally, the projection of the pad member that projects into the cylinder chamber from the through hole in the center of the plate that holds the pad member in place is also compressed and deformed by the impact of a piston, etc. Therefore, there is a problem that the edge of the hole at the center of the plate is crushed outwards in the radial direction on the cylinder chamber side and is caught, damaging the pad member.

【0004】[0004]

【課題を解決するための手段】本発明は上述の問題点を
解決するために、圧流体シリンダにおいて、シリンダキ
ャップとピストンの対向部分の何れか一方にダンパ挿入
孔を他方に開口して形成し、このダンパ挿入孔に、棒状
ゴムダンパを径方向に遊びを有して入れると共に抜け止
めを施し、かつ、棒状ゴムダンパの先端に所定長さの面
取り部を形成し、この面取り部をシリンダ室内へ突出さ
せたことを特徴とする。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pressure fluid cylinder in which a damper insertion hole is formed in either one of the opposing portions of a cylinder cap and a piston. , A rod-shaped rubber damper is inserted in the damper insertion hole with play in the radial direction to prevent the rod-shaped rubber damper from coming off, and a chamfered portion of a predetermined length is formed at the tip of the rod-shaped rubber damper, and this chamfered portion projects into the cylinder chamber. It is characterized by having done.

【0005】[0005]

【発明の実施の形態】この発明は、ロッドレスシリンダ
を含む空、油圧作動の圧流体シリンダに適用される。棒
状ゴムダンパは先細りの段付形状に形成され、その細径
部先端に面取り部を形成し、この棒状ゴムダンパを、ピ
ストンまたは、シリンダキャップに形成した段付形状の
ダンパ挿入孔に径方向の遊びを有して入れることで抜け
止めすると共に、面取り部をシリンダ室内へ突出させ
る。このようにすることで、ピストンが当接するとダン
パ挿入孔の開口部縁部より内側に面取り部が入り込むの
で、棒状ゴムダンパが直径方向に広がっても、ダンパ挿
入孔の開口部縁部にひっかからず、棒状ゴムダンパの外
周に傷をつけない。棒状ゴムダンパは、スプリング硬度
60〜70のニトリルゴムから成形される。また、棒状
ゴムダンパのダンパ挿入孔との径方向の遊びは、棒状ゴ
ムダンパが所定圧縮力を受けた時にその径が拡開して前
記ダンパ挿入孔に圧接するように設定し、しかも、この
時シリンダキャップとピストン端面間に所定隙間を生じ
させるように、棒状ゴムダンパの面取り部の突出量が設
定してある。更に、シリンダキャップに前記ダンパ挿入
孔を設け、シリンダキャップの流体給排ポートからの圧
流体を、このダンパ挿入孔を介してシリンダ室へ給排す
るようにしてあり、こうして、ピストンにより加えられ
る衝撃をゴムダンパが吸収したときに生じるゴムダンパ
内での熱を、積極的に圧流体で奪い取るようにしてあ
る。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention is applied to an empty, hydraulically operated pressure fluid cylinder including a rodless cylinder. The rod-shaped rubber damper is formed in a tapered stepped shape, and a chamfer is formed at the tip of the small diameter portion, and this rod-shaped rubber damper is provided with radial play in the stepped damper insertion hole formed in the piston or cylinder cap. By holding it, it can be prevented from coming off and the chamfer can be projected into the cylinder chamber. By doing this, when the piston comes into contact, the chamfer enters inside the opening edge of the damper insertion hole, so even if the rod-shaped rubber damper expands in the diameter direction, it does not get caught in the opening edge of the damper insertion hole. , Do not scratch the outer circumference of the rod-shaped rubber damper. The rod-shaped rubber damper is molded from nitrile rubber having a spring hardness of 60 to 70. Further, the radial play of the rod-shaped rubber damper with respect to the damper insertion hole is set so that when the rod-shaped rubber damper receives a predetermined compression force, its diameter expands and comes into pressure contact with the damper insertion hole. The projection amount of the chamfered portion of the rod-shaped rubber damper is set so as to create a predetermined gap between the cap and the end surface of the piston. Further, the cylinder cap is provided with the damper insertion hole so that the pressure fluid from the fluid supply / discharge port of the cylinder cap is supplied to and discharged from the cylinder chamber through the damper insertion hole. The heat in the rubber damper generated when the rubber damper absorbs is positively taken away by the pressure fluid.

【0006】[0006]

【実施例】以下、空気圧で作動するロッドレスシリンダ
に本発明を適用した場合についてより具体的に説明す
る。図1において、シリンダバレル(シリンダ本体)1
には、シリンダ孔3が軸方向全長に亘って形成され、そ
の上壁にはスリット5がやはり軸方向全長に亘って形成
されている。シリンダバレル1の両端部は(図1では片
側のみ示すが)、シリンダキャップ7で夫々塞がれてシ
リンダ室9が構成されている。このシリンダ室9には、
ピストンヨ−ク11の左右にピストンエンド13を連結
して構成されるピストン15が軸方向摺動自在に嵌装さ
れている。ピストンヨ−ク11はその上部が細くなって
前記スリット5より外部へ突出され、この突出部にはコ
字丈のマウント17が連結されている。このマウント1
7はスリット5を内側及び外側から塞ぐインナ−シ−ル
バンド19及びアウタ−シ−ルバンド21を案内してお
り、これらのインナ−シ−ルバンド19及びアウタ−シ
−ルバンド21はその両端が前記シリンダキャップ7に
止めねじ23とスペ−サ25により連結されている。
The following is a more specific description of the case where the present invention is applied to a rodless cylinder operated by air pressure. In FIG. 1, a cylinder barrel (cylinder body) 1
The cylinder hole 3 is formed over the entire length in the axial direction, and the slit 5 is formed over the entire length in the axial direction on the upper wall thereof. Both ends of the cylinder barrel 1 (only one side is shown in FIG. 1) are closed by cylinder caps 7 to form a cylinder chamber 9. In this cylinder chamber 9,
A piston 15 configured by connecting piston ends 13 to the left and right of the piston yoke 11 is axially slidably fitted. The piston yoke 11 has a thin upper portion and is projected to the outside from the slit 5, and a U-shaped mount 17 is connected to this protruding portion. This mount 1
7 guides an inner seal band 19 and an outer seal band 21 that close the slit 5 from the inside and the outside, and both ends of the inner seal band 19 and the outer seal band 21 are the cylinders. It is connected to the cap 7 by a set screw 23 and a spacer 25.

【0007】このようなロッドレスシリンダCYにおい
て、シリンダキャップ7はその軸部27に前記ピストン
15と対向する部分にダンパ挿入孔29が設けられてい
る。このダンパ挿入孔29は太径孔31と、この太径孔
31に挿入されてシリンダキャップ7と一体のキャップ
33に形成された小径孔35とから、軸方向に段付形状
で、且つ、その断面上部がシリンダキャップ7の上面に
平行な平面部となる形状に形成してある。このダンパ挿
入孔29には、前記段付形状と対応し、しかし、シリン
ダバレル1の径方向でダンパ挿入孔29の内周面との間
に所定の遊びを有するように、その太さを細くした段付
形状の棒状ゴムダンパ37が軸方向に固着されることな
く挿入され、ダンパ挿入孔29と棒状ゴムダンパ37の
段部によって棒状ゴムダンパ37が軸方向へ向け止めさ
れている。この棒状ゴムダンパ37の長さLは、先端の
受圧面積に対する長さLの割合が大きくなるようにして
あり、軸方向にたわみ易くしてある。この長さLは、自
由表面積に対する受圧面積の比を示す形状係数で表せ
ば、形状係数が0.25以下となるような長さであるこ
と(円形断面では断面直径と長さが同一以上の長さ)が
好ましい。この棒状ゴムダンパ37は、潤滑の関係から
耐油性があり、しかも反発性の比較的低い材質(例えば
ニトリルゴム)が良く、そのスプリング硬さHs(ゴム
硬さ)は、Hs85よりもHs70の方がより良い結果
が得られた。この棒状ゴムダンパ37はその小径部39
の先端部に面取り部41が形成され、棒状ゴムダンパ3
7の太径部43後端面がダンパ挿入孔29の底部と当接
している状態で、この面取り部41が前記キャップ33
端面からシリンダ室9へ突出するようになっている。こ
の面取り部41の突出量L1、及び棒状ゴムダンパ37
とダンパ挿入孔29との径方向の遊びは、棒状ゴムダン
パ37が所定の軸方向圧縮力(ピストン推力によるエネ
ルギとマウント17上の荷重による慣性エネルギによ
る)を受けた時に、棒状ゴムダンパ37が軸方向にクッ
ションストロ−クstたわみ、かつその太さが径方向に
拡開して前記ダンパ挿入孔29の内面に圧着し、しか
も、このように圧着してピストン15を停止させた時、
ピストン15とシリンダキャップ7のキャップ33の相
対する端面間には僅かな間隙δがあるように、ゴムの弾
性等とも関連づけられて設定されている。前記ダンパ挿
入孔29の底部は、シリンダキャップ7に設けられた圧
流体の給排用ポ−ト45に連通孔47を介して連通さ
れ、また、ダンパ挿入孔29のキャップ33には前記小
径孔35の上下に矩形断面の圧流体通過溝49が形成さ
れ、さらにキャップ33前、後端面には前記圧流体通過
溝49につながった上下の溝51a、51bが形成さ
れ、シリンダ室9と圧流体の給排用ポ−ト45は、ダン
パ挿入孔29を介して連通されている。
In such a rodless cylinder CY, the cylinder cap 7 is provided with a damper insertion hole 29 in a portion of the cylinder cap 7 facing the piston 15. The damper insertion hole 29 has a large-diameter hole 31 and a small-diameter hole 35 that is inserted into the large-diameter hole 31 and is formed in a cap 33 that is integral with the cylinder cap 7. The upper portion of the cross section is formed into a flat surface portion parallel to the upper surface of the cylinder cap 7. The damper insertion hole 29 corresponds to the stepped shape, but has a small thickness so as to have a predetermined play with the inner peripheral surface of the damper insertion hole 29 in the radial direction of the cylinder barrel 1. The stepped rod-shaped rubber damper 37 is inserted without being fixed in the axial direction, and the rod-shaped rubber damper 37 is stopped in the axial direction by the damper insertion hole 29 and the stepped portion of the rod-shaped rubber damper 37. The length L of the rod-shaped rubber damper 37 is such that the ratio of the length L to the pressure receiving area of the tip is large, and it is easily bent in the axial direction. This length L is a length such that the shape factor is 0.25 or less in terms of the shape factor indicating the ratio of the pressure receiving area to the free surface area (in the circular cross section, the cross sectional diameter and the length are equal to or more than the same). Length) is preferred. This rod-shaped rubber damper 37 is preferably made of a material having oil resistance and relatively low resilience (for example, nitrile rubber) due to lubrication, and its spring hardness Hs (rubber hardness) is Hs70 rather than Hs85. Better results were obtained. This rod-shaped rubber damper 37 has a small diameter portion 39.
A chamfer 41 is formed at the tip of the rod-shaped rubber damper 3
In the state where the rear end surface of the large diameter portion 43 of 7 contacts the bottom portion of the damper insertion hole 29, the chamfered portion 41 is
The end surface projects into the cylinder chamber 9. The protrusion amount L1 of the chamfer 41 and the rod-shaped rubber damper 37
The radial play between the rod-shaped rubber damper 37 and the damper insertion hole 29 is such that when the rod-shaped rubber damper 37 receives a predetermined axial compression force (the energy of the piston thrust and the inertial energy of the load on the mount 17), the rod-shaped rubber damper 37 is axially moved. When the cushion stroke st is flexed, and its thickness is expanded in the radial direction to be crimped to the inner surface of the damper insertion hole 29, and when the piston 15 is stopped by crimping in this way,
There is a slight gap δ between the opposed end surfaces of the piston 15 and the cap 33 of the cylinder cap 7, which is set in association with the elasticity of rubber and the like. The bottom portion of the damper insertion hole 29 is communicated with a pressure fluid supply / discharge port 45 provided in the cylinder cap 7 through a communication hole 47, and the cap 33 of the damper insertion hole 29 is provided with the small diameter hole. A pressure fluid passage groove 49 having a rectangular cross section is formed above and below 35, and upper and lower grooves 51a and 51b connected to the pressure fluid passage groove 49 are formed on the front and rear end surfaces of the cap 33. The supply / discharge port 45 is communicated through the damper insertion hole 29.

【0008】このような構成によれば、マウント17に
所定の荷重をかけてピストン15が所定の速度で左行又
は、右行すると、そのストロ−クエンド付近でピストン
15の推力によるエネルギと荷重による慣性エネルギが
棒状ゴムダンパ37に作用する。すると、棒状ゴムダン
パ37は軸方向に圧縮されつつ径方向に拡開する。ゴム
ダンパを棒状にしたことでその受圧面積に対する長さの
割合が大となり、軸方向のたわみは従来のものより多く
なる。そしてこのたわみにより生ずる拡開変位は、棒状
ゴムダンパ37とダンパ挿入孔29間に径方向の間隙が
あるので、棒状ゴムダンパ37がダンパ挿入孔29に圧
接するまで容易に変形する。このように軸方向たわみ量
を多くして、このたわみ量に関連してキャップ33から
の突出量L1を長くしてやることでクッションストロ−
クstを従来より長くできることになる。そして、この
ように長いクッションストロ−クstをうけるのでピス
トン15は停止までの制動距離が長くなり、ピストン1
5にかかる加速度が小さくなる。こうして、棒状ゴムダ
ンパ37がダンパ挿入孔29に圧接するまでに前記エネ
ルギが棒状ゴムダンパ37で殆ど吸収され、その後、棒
状ゴムダンパ37の拡開がダンパ挿入孔29で規制され
る。すると、軸方向たわみも規制され、クッション作用
の終りに向けて残ったエネルギが棒状ゴムダンパ37先
端をつぶすようにして円滑に吸収され、ピストン15は
シリンダキャップ7端面の僅かに手前で停止される。
According to this structure, when a predetermined load is applied to the mount 17 and the piston 15 moves leftward or rightward at a predetermined speed, the energy and the load due to the thrust of the piston 15 near the stroke end. The inertial energy acts on the rod-shaped rubber damper 37. Then, the rod-shaped rubber damper 37 expands in the radial direction while being compressed in the axial direction. By making the rubber damper into a rod shape, the ratio of the length to the pressure receiving area becomes large, and the axial deflection becomes larger than that of the conventional one. The expansion displacement caused by this bending is easily deformed until the rod-shaped rubber damper 37 comes into pressure contact with the damper insertion hole 29 because there is a radial gap between the rod-shaped rubber damper 37 and the damper insertion hole 29. In this way, the cushion stroke is increased by increasing the axial deflection amount and lengthening the protrusion amount L1 from the cap 33 in relation to the deflection amount.
The st can be made longer than before. Since such a long cushion stroke st is received, the piston 15 has a longer braking distance until it is stopped.
The acceleration applied to 5 becomes small. Thus, most of the energy is absorbed by the rod-shaped rubber damper 37 until the rod-shaped rubber damper 37 comes into pressure contact with the damper-inserted hole 29, and thereafter the expansion of the rod-shaped rubber damper 37 is restricted by the damper insertion hole 29. Then, the axial deflection is also regulated, and the energy remaining toward the end of the cushioning action is smoothly absorbed by crushing the tip end of the rod-shaped rubber damper 37, and the piston 15 is stopped slightly before the end surface of the cylinder cap 7.

【0009】本実施例ではシリンダキャップ7のキャッ
プ33にピストン15が当接しないので、ピストン15
に衝撃が加わるおそれがないが、拡開時にピストン15
とシリンダキャップ7端面が当接してもよい。また、ピ
ストン15が棒状ゴムダンパ37に当接すると、棒状ゴ
ムダンパ37の先端が軸方向にたわみながら拡開する
が、棒状ゴムダンパ37の先端に面取り部41が形成し
てあるので、ピストン15が当接すると同時に、ダンパ
挿入孔29の開口部縁部より内側に小径部39より更に
細い面取り部41が入り込み、棒状ゴムダンパ37外周
が拡開してもダンパ挿入孔29の開口部縁部にひっかか
らず、棒状ゴムダンパ37外周に傷をつけないので、棒
状ゴムダンパ37の耐久性を向上できる。また、このよ
うに棒状ゴムダンパ37の小径部39より面取り部41
の先端部の断面積(受圧面積)をより小さくしたことに
より、ピストン速度が速い時にはクッション作用が有効
に作用して、ピストン制動時の加速度が小さくなること
を本願出願人は実験により確認している。また、棒状ゴ
ムダンパ37がピストン15等によるエネルギを吸収す
ると、これは棒状ゴムダンパ37内で熱エネルギに変換
され、棒状ゴムダンパ37の温度が上昇することは周知
であるが、本実施例では、棒状ゴムダンパ37を入れて
いるダンパ挿入孔29を介して圧流体が給排されるの
で、通過する圧流体により棒状ゴムダンパ37の熱が奪
われ、温度上昇を防ぐことができ、やはり、棒状ゴムダ
ンパ37の耐久性が向上できる。また、本実施例では、
ダンパ挿入孔29で棒状ゴムダンパ37の拡開を規制す
るようにしたので、使用空気圧力がある程度(±2kg
/cm2程度)変化してもピストン15のストロ−ク誤
差、つまり棒状ゴムダンパ37のクッションストロ−ク
をあまり変化しないようにできるが、ピストン15のス
トロ−ク誤差があまり問題でない場合は、ダンパ挿入孔
29で棒状ゴムダンパ37の拡開を規制する必要はな
い。更に、棒状ゴムダンパ37のダンパ挿入孔29はシ
リンダキャップ7に直接加工してもよい。また、図6に
示すように、ピストンエンド13に段付のダンパ挿入孔
29が形成され、このダンパ装着孔にやはり段付棒状ゴ
ムダンパ37が径方向に遊びをもって挿入されてもよ
い。なお、ロッドを有するシリンダにおいても、ヘッド
側のシリンダキャップに本発明を採用できることは云う
までもない。
In this embodiment, since the piston 15 does not contact the cap 33 of the cylinder cap 7, the piston 15
There is no risk of impact on the piston, but the piston 15
The end surface of the cylinder cap 7 may abut. Further, when the piston 15 comes into contact with the rod-shaped rubber damper 37, the tip end of the rod-shaped rubber damper 37 expands while flexing in the axial direction. However, since the chamfered portion 41 is formed at the tip end of the rod-shaped rubber damper 37, the piston 15 comes into contact with it. At the same time, the chamfered portion 41 that is thinner than the small diameter portion 39 enters inside the opening edge portion of the damper insertion hole 29, and even if the outer periphery of the rod-shaped rubber damper 37 expands, the edge portion of the damper insertion hole 29 is not scratched. Since the outer circumference of the rod-shaped rubber damper 37 is not damaged, the durability of the rod-shaped rubber damper 37 can be improved. Further, in this way, the chamfered portion 41 is smaller than the small diameter portion 39 of the rod-shaped rubber damper 37.
The applicant confirmed by experiments that by making the cross-sectional area (pressure receiving area) of the tip of the piston smaller, the cushioning action effectively works when the piston speed is high, and the acceleration during piston braking becomes small. There is. It is well known that when the rod-shaped rubber damper 37 absorbs energy from the piston 15 or the like, it is converted into heat energy in the rod-shaped rubber damper 37, and the temperature of the rod-shaped rubber damper 37 rises. Since the pressure fluid is supplied and discharged through the damper insertion hole 29 in which 37 is inserted, the heat of the rod-shaped rubber damper 37 is taken away by the passing pressure fluid and the temperature rise can be prevented. You can improve the property. Further, in this embodiment,
Since the expansion of the rod-shaped rubber damper 37 is regulated by the damper insertion hole 29, the operating air pressure is kept to some extent (± 2 kg
/ Cm 2 or so) of the piston 15 also vary stroke - click error, i.e. a cushion stroke of the rod-shaped rubber dampers 37 - although the click can be prevented from change much, stroke of the piston 15 - when click error is less problem, damper It is not necessary to restrict the expansion of the rod-shaped rubber damper 37 with the insertion hole 29. Further, the damper insertion hole 29 of the rod-shaped rubber damper 37 may be directly processed in the cylinder cap 7. Further, as shown in FIG. 6, a stepped damper insertion hole 29 may be formed in the piston end 13, and the stepped rod-shaped rubber damper 37 may also be inserted in the damper mounting hole with play in the radial direction. It is needless to say that the present invention can be applied to the cylinder cap on the head side even in the cylinder having the rod.

【0010】図5に、本願出願人が実験した最も好適な
場合の実験結果の一例を示す。内径10mmのロッドレ
スシリンダにおいて、 長さLに対する突出量L1の比:0.2〜0.3程度 遊び:0.4mm/径 程度 材質:ニトリルゴム ゴムのスプリング硬さ:Hs70 ピストン速度:0.5m/s マウント上の荷重:0.4kg 使用空気圧力:5kgf/cm2 という条件の下で、ピストン15に生じる加速度は7〜
8G程度であった。
FIG. 5 shows an example of an experimental result in the most preferable case in which the applicant of the present invention conducted an experiment. In a rodless cylinder with an inner diameter of 10 mm, the ratio of the protrusion amount L1 to the length L: about 0.2 to 0.3 Play: 0.4 mm / diameter Material: Nitrile rubber Spring hardness of rubber: Hs70 Piston speed: 0. 5 m / s Load on mount: 0.4 kg Working air pressure: 5 kgf / cm 2 Under the condition of acceleration of piston 15 is 7 to
It was about 8G.

【0011】[0011]

【発明の効果】以上のように、本発明は、棒状ゴムダン
パを採用したので、その長さが断面積に対して大きな割
合となり、同一圧縮力が作用してもその軸方向変形量が
大きくなり、しかもダンパ挿入孔と棒状ゴムダンパ間に
は径方向の遊びがあるので、前記により軸方向変形量が
大きくなって径方向の拡開が大となっても、その径方向
の拡開変位が自在であり、従って、拡開変位を大きく出
来る分だけ、シリンダカバ−またはピストンロッドの端
面からの棒状ゴムダンパの突出量(はみ出し量)を大き
くでき、これにより、ピストンのクッションストロ−ク
が大きくできて、その結果、長い制動距離でピストンを
制動することになり、ピストン制動時のピストンにかか
る加速度を小さくし得る。また、本発明はゴムダンパを
このように棒状としてダンパ挿入孔に入れるだけの簡単
な構成であるので、装置全体を小型化できて小径の圧流
体シリンダに使用できる。さらに、棒状ゴムダンパの先
端に所定長さの面取り部を形成し、この面取り部をシリ
ンダ室内へ突出させたので、ピストンが当接するとダン
パ挿入孔の開口部縁部より内側に面取り部が入り込み、
棒状ゴムダンパが直径方向に広がっても、ダンパ挿入孔
の開口部縁部にひっかからず、棒状ゴムダンパの外周に
傷をつけず、棒状ゴムダンパの耐久性を向上でき、長期
に亘ってクッション効果を維持できる利点がある。
As described above, since the present invention employs the rod-shaped rubber damper, the length thereof becomes a large proportion to the cross-sectional area, and the axial deformation amount becomes large even when the same compressive force acts. In addition, since there is radial play between the damper insertion hole and the rod-shaped rubber damper, even if the radial deformation increases and the radial expansion increases, the radial expansion displacement is free. Therefore, the amount of protrusion (protrusion amount) of the rod-shaped rubber damper from the end surface of the cylinder cover or piston rod can be increased by the amount that the expansion displacement can be increased, which allows the cushion stroke of the piston to be increased. As a result, the piston is braked over a long braking distance, and the acceleration applied to the piston during piston braking can be reduced. Further, since the present invention has a simple structure in which the rubber damper is rod-shaped and is inserted into the damper insertion hole, the entire apparatus can be downsized and can be used for a small-diameter pressure fluid cylinder. Furthermore, since a chamfered portion of a predetermined length is formed at the tip of the rod-shaped rubber damper and this chamfered portion is projected into the cylinder chamber, when the piston abuts, the chamfered portion enters inside the opening edge portion of the damper insertion hole,
Even if the rod-shaped rubber damper expands in the diameter direction, the edge of the opening of the damper insertion hole is not scratched, the outer periphery of the rod-shaped rubber damper is not scratched, the durability of the rod-shaped rubber damper can be improved, and the cushioning effect can be maintained for a long time. There are advantages.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明を実施したロッドレスシリンダの縦断面
である。
FIG. 1 is a vertical cross section of a rodless cylinder embodying the present invention.

【図2】図1のI−I断面図である。FIG. 2 is a cross-sectional view taken along the line II of FIG.

【図3】要部拡大断面である。FIG. 3 is an enlarged cross section of a main part.

【図4】図3のII−II断面である。4 is a II-II cross section of FIG. 3. FIG.

【図5】ピストンにかかる加速度の説明図である。FIG. 5 is an explanatory diagram of acceleration applied to a piston.

【図6】他の実施例である。FIG. 6 is another embodiment.

【符号の説明】[Explanation of symbols]

1 シリンダバレル(シリンダ本体) 7 シリンダキャップ 9 シリンダ室 15 ピストン 29 ダンパ挿入孔 37 棒状ゴムダンパ 41 面取り部 45 給排用ポ−ト CY ロッドレスシリンダ st クッションストロ−ク 1 Cylinder Barrel (Cylinder Main Body) 7 Cylinder Cap 9 Cylinder Chamber 15 Piston 29 Damper Insertion Hole 37 Rod Rubber Damper 41 Chamfering Part 45 Supply / Discharge Port CY Rodless Cylinder st Cushion Stroke

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 シリンダ本体端部をシリンダキャップで
塞いでシリンダ室を構成し、このシリンダ室内にピスト
ンを軸方向摺動自在に嵌装して成る圧流体シリンダにお
いて、シリンダキャップとピストンの対向部分の何れか
一方にダンパ挿入孔を他方に開口して形成し、このダン
パ挿入孔に、棒状ゴムダンパを径方向に遊びを有して入
れると共に抜け止めを施し、かつ、棒状ゴムダンパの先
端に所定長さの面取り部を形成し、この面取り部をシリ
ンダ室内へ突出させたことを特徴とする圧流体シリンダ
のクッション装置。
1. A pressure fluid cylinder in which a cylinder chamber is constructed by closing an end of a cylinder body with a cylinder cap, and a piston is fitted in the cylinder chamber so as to be slidable in an axial direction. A damper insertion hole is formed in either one of the two, and a rod-shaped rubber damper is inserted in this damper insertion hole with a radial play to prevent the rod-shaped rubber damper from slipping off. A cushion device for a pressure fluid cylinder, wherein a chamfered portion is formed, and the chamfered portion is projected into the cylinder chamber.
【請求項2】 棒状ゴムダンパのダンパ挿入孔との径方
向の遊びを、棒状ゴムダンパが所定圧縮力を受けた時に
その径が拡開して前記ダンパ挿入孔に圧接するように設
定し、しかも、この時シリンダキャップとピストン端面
間に所定隙間を生じさせるように、棒状ゴムダンパの面
取り部の突出量を設定したことを特徴とする請求項1項
記載の圧流体シリンダのクッション装置。
2. The radial play of the rod-shaped rubber damper with respect to the damper insertion hole is set so that when the rod-shaped rubber damper receives a predetermined compressive force, its diameter expands and comes into pressure contact with the damper insertion hole. 2. The cushion device for a pressure fluid cylinder according to claim 1, wherein the protrusion amount of the chamfered portion of the rod-shaped rubber damper is set so that a predetermined gap is created between the cylinder cap and the end surface of the piston at this time.
JP23782195A 1995-08-22 1995-08-22 Cushion device for pressure fluid cylinder Expired - Fee Related JP2723091B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23782195A JP2723091B2 (en) 1995-08-22 1995-08-22 Cushion device for pressure fluid cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23782195A JP2723091B2 (en) 1995-08-22 1995-08-22 Cushion device for pressure fluid cylinder

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP62162934A Division JPH0819924B2 (en) 1987-06-30 1987-06-30 Cushion device for pressure fluid cylinder

Publications (2)

Publication Number Publication Date
JPH0842518A true JPH0842518A (en) 1996-02-13
JP2723091B2 JP2723091B2 (en) 1998-03-09

Family

ID=17020907

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23782195A Expired - Fee Related JP2723091B2 (en) 1995-08-22 1995-08-22 Cushion device for pressure fluid cylinder

Country Status (1)

Country Link
JP (1) JP2723091B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918163A1 (en) * 1997-11-24 1999-05-26 Howa Machinery Limited An elastomer damper for an actuator cylinder
JP2008045646A (en) * 2006-08-14 2008-02-28 Koganei Corp Fluid-pressure actuator
JP2010281368A (en) * 2009-06-03 2010-12-16 Smc Corp Air cushion mechanism for pneumatic cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918163A1 (en) * 1997-11-24 1999-05-26 Howa Machinery Limited An elastomer damper for an actuator cylinder
JP2008045646A (en) * 2006-08-14 2008-02-28 Koganei Corp Fluid-pressure actuator
JP2010281368A (en) * 2009-06-03 2010-12-16 Smc Corp Air cushion mechanism for pneumatic cylinder

Also Published As

Publication number Publication date
JP2723091B2 (en) 1998-03-09

Similar Documents

Publication Publication Date Title
US4265344A (en) Liquid spring with integral plastic body and seal and fabrication method therefor
JP2002286076A (en) Braking and suffering device for movable part of furniture or the like
US4628579A (en) Method of fabricating a liquid spring shock absorber with integral plastic body and seal
JP3543592B2 (en) Rubber damper
US6092456A (en) Rodless power cylinder
EP0896174B1 (en) Piston ring arrangement for shock absorber
US6659470B2 (en) Oil seal of hydraulic shock absorber
US7252031B2 (en) Cylinder apparatus
US5535862A (en) Suspension strut with quiet rebound stop
JPH0842518A (en) Cushion device for pressure fluid cylinder
JP4442842B2 (en) Damper rebound stopper structure
US6668862B2 (en) Fluid bearing mechanism
JPH0819924B2 (en) Cushion device for pressure fluid cylinder
JP7507565B2 (en) Stroke Simulator
JPS6137880Y2 (en)
JP3395881B2 (en) Rodless cylinder cushion device
JP3340338B2 (en) Fluid pressure cylinder with shock absorber
JP2007046667A (en) Valve structure
JP4336220B2 (en) Oil seal structure of hydraulic shock absorber
JP3138212B2 (en) Fluid pressure cylinder with shock absorber
KR100320807B1 (en) Shock absorber
JP7133421B2 (en) buffer stopper
JP2001295877A (en) Shock absorber
JPH07301273A (en) Seal ring structure in free piston
JP2541731Y2 (en) Check valve

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees