JPH08105408A - Piston seal structure for single acting hydraulic cylinder device - Google Patents

Piston seal structure for single acting hydraulic cylinder device

Info

Publication number
JPH08105408A
JPH08105408A JP6264538A JP26453894A JPH08105408A JP H08105408 A JPH08105408 A JP H08105408A JP 6264538 A JP6264538 A JP 6264538A JP 26453894 A JP26453894 A JP 26453894A JP H08105408 A JPH08105408 A JP H08105408A
Authority
JP
Japan
Prior art keywords
annular
peripheral surface
cylinder
inner peripheral
piston
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
JP6264538A
Other languages
Japanese (ja)
Other versions
JP3094811B2 (en
Inventor
Morikazu Morohoshi
盛一 諸星
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.)
KODAIRA IND
KODAIRA SANGYO KK
KYODO KASEI KK
NAKASHIKI SHOJI KK
YUNIPURA KK
Oiles Industry Co Ltd
Original Assignee
KODAIRA IND
KODAIRA SANGYO KK
KYODO KASEI KK
NAKASHIKI SHOJI KK
YUNIPURA KK
Oiles Industry Co 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 KODAIRA IND, KODAIRA SANGYO KK, KYODO KASEI KK, NAKASHIKI SHOJI KK, YUNIPURA KK, Oiles Industry Co Ltd filed Critical KODAIRA IND
Priority to JP06264538A priority Critical patent/JP3094811B2/en
Publication of JPH08105408A publication Critical patent/JPH08105408A/en
Application granted granted Critical
Publication of JP3094811B2 publication Critical patent/JP3094811B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Sealing With Elastic Sealing Lips (AREA)

Abstract

PURPOSE: To prevent leakage of high pressure oil so as to reduce sliding resistance by providing a circular elastic body in a sealing groove of a piston and a resin circular seal body between the outer circumferential face of the circular elastic body and the cylinder inner circumferential face and forming a circular groove on a pressure chamber side pressure receiving surface in the circular elastic body. CONSTITUTION: High pressure oil to be fed to a pressure chamber 19 in a cylinder 5 is introduced to a circular groove 21 via a circular gap 63, and a circular tongue part 34 is warped outward so as to push a circular seal body 9 toward an inner circumferential face 6 of the cylinder 5, and the outer circumferential face 7 of the circular seal 9 is brought into contact with the inner circumferential face 6 so as to prevent the oil inside the pressure chamber 19 from leaking. Therefore, leakage of the high pressure oil can be prevented even when interference between the inner circumferential face 6 and the circular seal body 9 is comparatively little. When the oil is returned to a tank from the pressure chamber 19, the outward deflection of the circular tongue part 34 is eliminated as a pressure in the pressure chamber 19 is comparatively lowered, and as a result, pressing of the circular seal body 9 to the inner circumferential face 6 by the high pressure oil is eliminated, and sliding resistance of the circular seal body 9 toward the inner circumferential face 6 can be reduced.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、単動型油圧シリンダ装
置用ピストンシール構造に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston seal structure for a single-acting hydraulic cylinder device.

【0002】[0002]

【従来の技術】ダンプトラックの荷台突き上げ用単動型
油圧シリンダ装置は、例えばそのピストンロッドの一端
が荷台に、シリンダの一端が車体(シャーシ)にそれぞ
れ回動自在に取り付けられて、荷台突き上げ時には、油
圧ポンプからのオイル(油圧)がシリンダ内に供給さ
れ、荷台の戻り時には、荷台荷重を受けるピストンの戻
りと共にシリンダ内のオイルを、開弁されたポートを介
してタンクに戻すようにしている。そして荷台突き上げ
時は、シリンダ内の圧力室には150kgf/m2〜2
10kgf/m2 程度の高圧油が供給されるが、荷台の
戻り時には、荷台荷重に対応した低油圧がシリンダ内の
圧力室に生じる。このような単動型油圧シリンダ装置の
ピストンシール構造として、断面矩形状の弾性バックア
ップリング又はゴム製のOリングと、ポリテトラフルオ
ロエチレン等のシールリングとからなり、バックアップ
リング又はOリングが、ピストンに形成されたシールリ
ング溝に配され、その外周面にシールリングが、シリン
ダの内周面との間に締め代をもって装着されてなるもの
が従来用いられている。
2. Description of the Related Art A single-acting hydraulic cylinder device for pushing up a platform of a dump truck has, for example, one end of its piston rod rotatably attached to a platform and one end of a cylinder rotatably attached to a vehicle body (chassis). The oil (hydraulic pressure) from the hydraulic pump is supplied into the cylinder, and when the platform is returned, the oil in the cylinder is returned to the tank through the opened port together with the return of the piston that receives the platform load. . When the platform is pushed up, the pressure chamber in the cylinder has 150 kgf / m 2 to 2
High-pressure oil of about 10 kgf / m 2 is supplied, but when the platform is returned, a low hydraulic pressure corresponding to the platform load is generated in the pressure chamber in the cylinder. As a piston seal structure of such a single-acting hydraulic cylinder device, an elastic backup ring having a rectangular cross section or an O ring made of rubber and a seal ring made of polytetrafluoroethylene or the like are used, and the backup ring or the O ring is a piston. Conventionally used is a seal ring groove which is formed on the outer peripheral surface of which a seal ring is mounted with an interference with the inner peripheral surface of the cylinder.

【0003】[0003]

【発明が解決しようとする課題】ところで上記のような
従来のピストンシール構造では、荷台突き上げ時の高圧
のオイルの漏れを防止するため、シリンダの内周面との
間に大きな締め代をもってシールリングがバックアップ
リング又はOリングとシリンダの内周面との間に装着さ
れているので、この大きな締め代の影響によりシリンダ
の内周面に対するシールリングの摺動抵抗は比較的大き
く、このため荷台の戻り時におけるピストンの戻りにス
ムーズさを欠き、スティク・スリップを生じる等の不都
合の虞がある。
In the conventional piston seal structure as described above, in order to prevent the high-pressure oil from leaking when the bed is pushed up, the seal ring has a large interference with the inner peripheral surface of the cylinder. Is mounted between the backup ring or O-ring and the inner peripheral surface of the cylinder, the sliding resistance of the seal ring with respect to the inner peripheral surface of the cylinder is relatively large due to the influence of this large tightening margin. There is a risk of inconvenience such as lack of smoothness in returning the piston at the time of returning, causing sticky slip.

【0004】本発明は、前記諸点に鑑みてなされたもの
であって、その目的とするところは、シリンダ内の圧力
室に油圧が供給されると、等価的に大きな締め代をもっ
てシールリングが装着されたようにし得て、例えば荷台
突き上げ時の高圧のオイルの漏れを防止することができ
る一方、シリンダ内の圧力室が低油圧にされると、小さ
な締め代をもってシールリングが装着されたようにし得
て、シリンダの内周面に対するシールリングの摺動抵抗
を小さくして、例えば荷台の戻り時におけるピストンの
戻りをスムーズに行わせることができ、スティク・スリ
ップの発生をなくし得る、単動型油圧シリンダ装置用ピ
ストンシール構造を提供することにある。
The present invention has been made in view of the above points, and an object thereof is to equip a seal ring with an equivalently large tightening margin when hydraulic pressure is supplied to a pressure chamber in a cylinder. It is possible to prevent leakage of high-pressure oil when pushing up the bed, for example, while the pressure chamber in the cylinder is set to low hydraulic pressure so that the seal ring is installed with a small interference. As a result, the sliding resistance of the seal ring with respect to the inner peripheral surface of the cylinder can be reduced so that, for example, the piston can be smoothly returned when the platform is returned, and the occurrence of stiction and slip can be eliminated. It is to provide a piston seal structure for a hydraulic cylinder device.

【0005】[0005]

【課題を解決するための手段】本発明によれば前記目的
は、ピストンに形成されたシールリング溝に配される環
状弾性体と、シリンダの内周面に当接する外周面を有し
て、環状弾性体の外周面とシリンダの内周面との間に配
される樹脂製の環状シール体とを具備し、環状弾性体
は、非圧力室側においてシールリング溝を規定する一方
の環状側壁に当接する環状端面を有した環状基部と、シ
リンダの圧力室側の受圧面に環状溝を形成するように、
環状基部から一体的に伸びた環状二股部とを具備し、環
状二股部は、シールリング溝を規定する環状底壁に当接
して、環状基部からシリンダ軸心に沿って伸びた小径部
と、環状基部から斜め外方向に伸びた環状舌部とを具備
し、環状シール体は、環状基部及び環状舌部のそれぞれ
の外周面並びに環状舌部の環状端面に対面し、これら外
周面及び環状端面と相補形状の内周面を有しており、環
状基部に対面する環状シール体の内周面は、ピストン外
径よりも小径であり、環状弾性体の受圧面に形成された
環状溝に、シリンダの圧力室の圧力が導入されるように
なっている、単動型油圧シリンダ装置用ピストンシール
構造によって達成される。
According to the present invention, the object is to have an annular elastic body arranged in a seal ring groove formed in a piston and an outer peripheral surface abutting on an inner peripheral surface of a cylinder, A ring-shaped elastic body made of resin disposed between the outer peripheral surface of the ring-shaped elastic body and the inner peripheral surface of the cylinder, wherein the ring-shaped elastic body defines one of the ring-shaped side walls on the non-pressure chamber side. To form an annular groove on the pressure receiving surface on the pressure chamber side of the cylinder.
An annular bifurcated portion integrally extending from the annular base portion, the annular bifurcated portion is in contact with an annular bottom wall defining the seal ring groove, and a small diameter portion extending from the annular base portion along the cylinder axis, And an annular tongue extending obliquely outward from the annular base, the annular seal body faces the outer peripheral surfaces of the annular base and the annular tongue and the annular end surface of the annular tongue, and the outer peripheral surface and the annular end surface. Has an inner peripheral surface of a complementary shape, the inner peripheral surface of the annular seal body facing the annular base is smaller than the piston outer diameter, in the annular groove formed in the pressure receiving surface of the annular elastic body, This is achieved by a piston seal structure for a single-acting hydraulic cylinder device, in which the pressure in the pressure chamber of the cylinder is introduced.

【0006】本発明の好ましい例では、環状舌部の外周
面と環状シール体の内周面とは、微小環状隙間を介して
対面しており、また他の好ましい例では、環状舌部の環
状端面と環状シール体の内周面とは、摺動自在に当接し
て対面している。更に、シールリング溝の軸方向長を環
状シール体の軸方向長よりも長くして、環状シール体の
受圧面に形成された環状溝に、シリンダの圧力室の圧力
が導入されるようにようにしてもよい。
In a preferred example of the present invention, the outer peripheral surface of the annular tongue and the inner peripheral surface of the annular seal member face each other with a minute annular gap therebetween, and in another preferred example, the annular tongue section has an annular shape. The end surface and the inner peripheral surface of the annular seal body slidably contact and face each other. Further, the axial length of the seal ring groove is made longer than the axial length of the annular seal body so that the pressure of the pressure chamber of the cylinder is introduced into the annular groove formed on the pressure receiving surface of the annular seal body. You may

【0007】環状シール体は、低摩擦の樹脂材、好まし
くはポリテトラフルオロエチレンから形成されていると
よく、また、ポリテトラフルオロエチレンを主成分(一
例として60重量%)として、これにBronze p
owder(一例として30重量%)及びCarbon
フィラー(一例として10重量%)等を混合したもの
から形成されてなるものであってもよい。環状弾性体と
しては、天然ゴム、合成ゴムのいずれの材料から形成さ
れていてもよい。本発明における環状溝は、断面形状に
おいて半円形、半楕円形、三角形若しくは矩形のいずれ
でもよいが、好ましい例では略半楕円形である。
The annular seal body is preferably made of a resin material having a low friction, preferably polytetrafluoroethylene, and polytetrafluoroethylene as a main component (60% by weight, for example), and Bronze p.
owder (30% by weight as an example) and Carbon
It may be formed of a mixture of a filler (10 wt% as an example) and the like. The annular elastic body may be formed of any material of natural rubber and synthetic rubber. The annular groove in the present invention may have any of a semicircular shape, a semielliptical shape, a triangular shape and a rectangular shape in cross section, but in a preferable example, it is a substantially semielliptical shape.

【0008】[0008]

【作用】本発明の単動型油圧シリンダ装置用ピストンシ
ール構造では、例えば荷台突き上げ時に、環状弾性体の
受圧面に形成された環状溝に、シリンダの圧力室の圧力
が導入されると、環状二股部の環状舌部が、導入された
圧力により外方向に撓まされ、これにより環状シール体
をシリンダの内周面に押し付けて、環状シール体の外周
面とシリンダの内周面との間を十分に液密に保持して、
高圧油の漏洩を阻止する。そして荷台の戻り時には、シ
リンダの圧力室の圧力の低下に伴って環状二股部の環状
舌部の撓みが解除される結果、環状シール体のシリンダ
の内周面への押し付けも解除され、而してシリンダの内
周面に対する環状シール体の摺動抵抗が小さくなり、荷
台の戻り時におけるピストンの戻りがスムーズに行われ
る。
In the piston seal structure for a single-acting hydraulic cylinder device of the present invention, when the pressure in the pressure chamber of the cylinder is introduced into the annular groove formed in the pressure receiving surface of the annular elastic body, for example, when the bed is pushed up, The annular tongue portion of the bifurcated portion is bent outward by the introduced pressure, thereby pressing the annular seal body against the inner peripheral surface of the cylinder, and between the outer peripheral surface of the annular seal body and the inner peripheral surface of the cylinder. Is kept liquid-tight enough,
Prevent leakage of high pressure oil. Then, when the loading platform returns, the bending of the annular tongue of the annular fork is released as the pressure in the pressure chamber of the cylinder decreases, and as a result, the pressing of the annular seal body against the inner peripheral surface of the cylinder is also released. As a result, the sliding resistance of the annular seal body against the inner peripheral surface of the cylinder is reduced, and the piston can be smoothly returned when the platform is returned.

【0009】以下本発明を、図に示す好ましい具体例に
基づいて更に詳細に説明する。なお、本発明はこれら具
体例に何等限定されないのである。
The present invention will be described in more detail below based on the preferred embodiments shown in the drawings. The present invention is not limited to these specific examples.

【0010】[0010]

【具体例】図1及び図2において本例の単動型油圧シリ
ンダ装置用ピストンシール構造1は、ピストン2に形成
されたシールリング溝3に配される環状弾性体4と、シ
リンダ5の内周面6に当接する外周面7を有して、環状
弾性体4の外周面8とシリンダ5の内周面6との間に配
される樹脂製の環状シール体9とを具備している。
1 and 2, a piston seal structure 1 for a single-acting hydraulic cylinder device according to the present embodiment includes an annular elastic body 4 arranged in a seal ring groove 3 formed in a piston 2 and a cylinder 5. It has an outer peripheral surface 7 that abuts on the peripheral surface 6, and is provided with a resin annular seal body 9 arranged between the outer peripheral surface 8 of the annular elastic body 4 and the inner peripheral surface 6 of the cylinder 5. .

【0011】環状弾性体4は、シリンダ5内のピストン
2により画成された非圧力室15側においてシールリン
グ溝3を規定する一方の環状側壁16に当接する環状端
面17を有した環状基部18と、シリンダ5内のピスト
ン2により画成された圧力室19側の受圧面20に略半
楕円形状の環状溝21を形成するように、環状基部18
から一体的に伸びた環状二股部22とを具備している。
環状二股部22は、シールリング溝3を規定する環状底
壁31に内周面32が当接して、シリンダ5の軸心に沿
って伸びた小径部33と、環状基部18から斜め外方向
に伸びた環状舌部34とを具備している。
The ring-shaped elastic body 4 has a ring-shaped base portion 18 having a ring-shaped end surface 17 that abuts one ring-shaped side wall 16 defining the seal ring groove 3 on the non-pressure chamber 15 side defined by the piston 2 in the cylinder 5. And the annular base portion 18 so as to form a substantially semi-elliptical annular groove 21 on the pressure receiving surface 20 on the pressure chamber 19 side defined by the piston 2 in the cylinder 5.
And an annular bifurcated portion 22 integrally extending from.
The annular forked portion 22 has an inner peripheral surface 32 in contact with an annular bottom wall 31 that defines the seal ring groove 3, and a small diameter portion 33 extending along the axial center of the cylinder 5 and an oblique outward direction from the annular base portion 18. An elongated annular tongue 34.

【0012】シールリングに相当する環状シール体9
は、環状基部18の外周面41及び環状舌部34の斜め
外周面42並びに環状舌部34の逆斜め環状端面43に
対面し、これら外周面41、42及び環状端面43と相
補形状の内周面、すなわち内周面44、斜め内周面45
及び逆斜め内周面46を有していると共に、更に、逆斜
め内周面46に連接して内周面44と同径の内周面47
を有している。環状基部18に対面する環状シール体9
の内周面44は、ピストン2の外径Dよりも小径であ
り、環状シール体9の非受圧面側の端面48は、内周側
で環状側壁16に当接している。
An annular seal body 9 corresponding to a seal ring
Faces the outer peripheral surface 41 of the annular base portion 18, the oblique outer peripheral surface 42 of the annular tongue portion 34, and the reverse oblique annular end surface 43 of the annular tongue portion 34, and the inner peripheral surface of a shape complementary to these outer peripheral surfaces 41, 42 and the annular end surface 43. Surface, ie, inner peripheral surface 44, diagonal inner peripheral surface 45
And an inner peripheral surface 47 having the same diameter as the inner peripheral surface 44 while having an inner surface 46 opposite to the inner surface.
have. Annular seal body 9 facing the annular base portion 18
The inner peripheral surface 44 has a smaller diameter than the outer diameter D of the piston 2, and the end surface 48 on the non-pressure receiving surface side of the annular seal body 9 is in contact with the annular side wall 16 on the inner peripheral side.

【0013】本例のピストンシール構造1では、環状基
部18及び環状舌部34の外周面41及び42と環状シ
ール体9の内周面44及び45とは、微小環状隙間51
及び52を介して対面しており、環状舌部34の環状端
面43と環状シール体9の内周面46とは、互いに摺動
自在に当接して対面している。
In the piston seal structure 1 of the present embodiment, the outer peripheral surfaces 41 and 42 of the annular base portion 18 and the annular tongue portion 34 and the inner peripheral surfaces 44 and 45 of the annular seal body 9 have a minute annular gap 51.
And 52, and the annular end surface 43 of the annular tongue portion 34 and the inner peripheral surface 46 of the annular seal body 9 slidably contact each other and face each other.

【0014】また、ピストンシール構造1では、シール
リング溝3の軸方向長Lは、環状シール体9の軸方向長
lよりも長く、環状弾性体4の受圧面20に形成された
環状溝21にシリンダ5の圧力室19の圧力が導入され
るように、環状シール体9の受圧側の端面61とシール
リング溝3を規定する他方の環状側壁62との間は、環
状間隙63が形成されるようになっている。
In the piston seal structure 1, the axial length L of the seal ring groove 3 is longer than the axial length l of the annular seal body 9, and the annular groove 21 formed in the pressure receiving surface 20 of the annular elastic body 4. An annular gap 63 is formed between the end surface 61 of the annular seal body 9 on the pressure receiving side and the other annular side wall 62 defining the seal ring groove 3 so that the pressure of the pressure chamber 19 of the cylinder 5 is introduced into the cylinder. It has become so.

【0015】以上のようなピストンシール構造1を有す
る単動型油圧シリンダ装置71は、例えばピストン2に
連結されたピストンロッド72のシリンダ5外突出端が
連結機構73を介してダンプトラック(図示せず)の荷
台に、シリンダ5の一端が連結機構74を介してダンプ
トラックの車体にそれぞれ回動自在に連結されて用いら
れる。そして単動型油圧シリンダ装置71は、荷台突き
上げ時には、ポート75を介して油圧ポンプからのオイ
ル(油圧)がシリンダ5の圧力室19に供給されて、ピ
ストンロッド72がシリンダ5外に伸長され、荷台の戻
り時には、ピストンロッド72を介して荷台荷重を受け
るピストン2の戻りと共にシリンダ5の圧力室19のオ
イルを、開弁されたポート75を介してタンクに戻すよ
うにしている。
In the single-acting hydraulic cylinder device 71 having the piston seal structure 1 as described above, for example, the protruding end of the piston rod 72 connected to the piston 2 outside the cylinder 5 is connected to the dump truck via the connecting mechanism 73 (not shown). One end of the cylinder 5 is rotatably connected to the vehicle body of the dump truck via the connecting mechanism 74. In the single-acting hydraulic cylinder device 71, oil (hydraulic pressure) from the hydraulic pump is supplied to the pressure chamber 19 of the cylinder 5 via the port 75 when the platform is pushed up, and the piston rod 72 is extended outside the cylinder 5. When the platform is returned, the oil in the pressure chamber 19 of the cylinder 5 is returned to the tank via the opened port 75 together with the return of the piston 2 which receives the platform load via the piston rod 72.

【0016】ところでピストンシール構造1では、シリ
ンダ5の圧力室19に供給される高油圧は、環状間隙6
3を介して環状溝21にも導入されるようになっている
ため、この環状溝21に導入された高油圧によって環状
舌部34が外方向に撓んで環状シール体9をシリンダ5
の内周面6に向かって押し、而して環状シール体9の外
周面7は、圧力室19のオイルが漏出しないように、シ
リンダ5の内周面6に液密に当接されるようになる。し
たがって環状シール体9のシリンダ5の内周面6との間
の締め代が比較的小さい場合でも、荷台突き上げ時の高
圧のオイルの漏れを防止することができる。一方、オイ
ルがシリンダ5の圧力室19からポート75を介してタ
ンクに戻される場合には、圧力室19が比較的低圧とな
るため、環状舌部34の外方向の撓みが解消される結
果、環状シール体9のシリンダ5の内周面6への高油圧
による押圧も解消され、而して、シリンダ5の内周面6
に対する環状シール体9の摺動抵抗を小さくすることが
できる。したがって荷台の戻り時におけるピストン2の
戻りをスムーズに行わせることができ、スティク・スリ
ップの発生をなくすことができる。
In the piston seal structure 1, however, the high hydraulic pressure supplied to the pressure chamber 19 of the cylinder 5 causes the annular gap 6
Since it is also introduced into the annular groove 21 through the annular groove 21, the annular tongue portion 34 bends outward due to the high hydraulic pressure introduced into the annular groove 21, and the annular seal body 9 is moved to the cylinder 5
The inner peripheral surface 6 of the cylinder 5, and the outer peripheral surface 7 of the annular seal body 9 is brought into liquid-tight contact with the inner peripheral surface 6 of the cylinder 5 so that oil in the pressure chamber 19 does not leak. become. Therefore, even when the tightening margin between the annular seal body 9 and the inner peripheral surface 6 of the cylinder 5 is relatively small, it is possible to prevent the high-pressure oil from leaking when the cargo bed is pushed up. On the other hand, when the oil is returned from the pressure chamber 19 of the cylinder 5 to the tank via the port 75, the pressure chamber 19 becomes a relatively low pressure, and as a result, the outward bending of the annular tongue 34 is eliminated. The pressing of the annular seal body 9 against the inner peripheral surface 6 of the cylinder 5 by the high hydraulic pressure is also eliminated, and thus the inner peripheral surface 6 of the cylinder 5 is released.
It is possible to reduce the sliding resistance of the annular seal body 9 with respect to. Therefore, the piston 2 can be smoothly returned when the luggage carrier is returned, and the occurrence of sticky slip can be eliminated.

【0017】[0017]

【発明の効果】以上のように本発明によれば、環状シー
ル体のシリンダの内周面との間の締め代を比較的小さく
しても、シリンダ内の圧力室に高油圧が供給されると、
等価的に大きな締め代をもってシールリングが装着され
たようにし得て、例えば荷台突き上げ時の高圧のオイル
の漏れを防止することができる一方、シリンダ内の圧力
室が低油圧にされると、小さな締め代をもってシールリ
ングが装着されたようにし得て、シリンダの内周面に対
するシールリングの摺動抵抗を小さくして、例えば荷台
の戻り時におけるピストンの戻りをスムーズに行わせる
ことができ、スティク・スリップの発生をなくし得る。
As described above, according to the present invention, high hydraulic pressure is supplied to the pressure chamber in the cylinder even if the tightening margin between the annular seal body and the inner peripheral surface of the cylinder is relatively small. When,
Equivalently, the seal ring may be installed with a large tightening allowance to prevent high-pressure oil from leaking when the bed is pushed up, for example, while the pressure chamber in the cylinder is made to have a low hydraulic pressure. The seal ring can be mounted with a tightening allowance, the sliding resistance of the seal ring with respect to the inner peripheral surface of the cylinder can be reduced, and, for example, the piston can be smoothly returned when the bed is returned. -Slip can be eliminated.

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

【図1】本発明の好ましい具体例が適用された単動型油
圧シリンダ装置の説明図である。
FIG. 1 is an explanatory diagram of a single-acting hydraulic cylinder device to which a preferred embodiment of the present invention is applied.

【図2】本発明の好ましい具体例の詳細説明図である。FIG. 2 is a detailed explanatory diagram of a preferred embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 単動型油圧シリンダ用ピストンシール構造 2 ピストン 3 シールリング溝 4 環状弾性体 6 内周面 7 外周面 8 外周面 9 環状シール体 18 環状基部 21 環状溝 22 環状二股部 33 小径部 34 環状舌部 1 Piston seal structure for single-acting hydraulic cylinder 2 Piston 3 Seal ring groove 4 Annular elastic body 6 Inner peripheral surface 7 Outer peripheral surface 8 Outer peripheral surface 9 Annular seal body 18 Annular base 21 Annular groove 22 Annular forked part 33 Small diameter part 34 Annular tongue Department

───────────────────────────────────────────────────── フロントページの続き (71)出願人 594178620 ユニプラ株式会社 埼玉県狭山市柏原337−24 (72)発明者 諸星 盛一 栃木県小山市大字稲葉郷1341ノ1 小平産 業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 594178620 UNIPLA Co., Ltd. 337-24 Kashiwara, Sayama City, Saitama Prefecture (72) Inventor Moriichi Morohoshi 1341 Inaba, Oyama City, Tochigi Prefecture Kodaira Industrial Co., Ltd.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 ピストンに形成されたシールリング溝に
配される環状弾性体と、シリンダの内周面に当接する外
周面を有して、環状弾性体の外周面とシリンダの内周面
との間に配される樹脂製の環状シール体とを具備し、環
状弾性体は、非圧力室側においてシールリング溝を規定
する一方の環状側壁に当接する環状端面を有した環状基
部と、シリンダの圧力室側の受圧面に環状溝を形成する
ように、環状基部から一体的に伸びた環状二股部とを具
備し、環状二股部は、シールリング溝を規定する環状底
壁に当接して、環状基部からシリンダ軸心に沿って伸び
た小径部と、環状基部から斜め外方向に伸びた環状舌部
とを具備し、環状シール体は、環状基部及び環状舌部の
それぞれの外周面並びに環状舌部の環状端面に対面し、
これら外周面及び環状端面と相補形状の内周面を有して
おり、環状基部に対面する環状シール体の内周面は、ピ
ストン外径よりも小径であり、環状弾性体の受圧面に形
成された環状溝に、シリンダの圧力室の圧力が導入され
るようになっている、単動型油圧シリンダ装置用ピスト
ンシール構造。
1. An outer peripheral surface of an annular elastic body and an inner peripheral surface of a cylinder having an annular elastic body arranged in a seal ring groove formed in a piston and an outer peripheral surface abutting on an inner peripheral surface of a cylinder. And a ring-shaped elastic body made of resin, wherein the ring-shaped elastic body has a ring-shaped base having a ring-shaped end face that abuts one ring-shaped side wall that defines a seal ring groove on the non-pressure chamber side, and a cylinder. So as to form an annular groove on the pressure receiving surface on the pressure chamber side, the annular bifurcated portion integrally extends from the annular base portion, and the annular bifurcated portion abuts on the annular bottom wall defining the seal ring groove. A small diameter portion extending from the annular base portion along the cylinder axis, and an annular tongue portion extending obliquely outward from the annular base portion, and the annular seal body includes outer peripheral surfaces of the annular base portion and the annular tongue portion, and Face the annular end surface of the annular tongue,
The inner peripheral surface of the annular seal body, which has an inner peripheral surface of a shape complementary to the outer peripheral surface and the annular end surface, is smaller than the outer diameter of the piston, and is formed on the pressure receiving surface of the annular elastic body. A piston seal structure for a single-acting hydraulic cylinder device, in which the pressure in the pressure chamber of the cylinder is introduced into the formed annular groove.
【請求項2】 環状舌部の外周面と環状シール体の内周
面とは、微小環状隙間を介して対面している、請求項1
に記載の単動型油圧シリンダ装置用ピストンシール構
造。
2. The outer peripheral surface of the annular tongue portion and the inner peripheral surface of the annular seal body are opposed to each other with a minute annular gap therebetween.
Piston seal structure for a single-acting hydraulic cylinder device described in.
【請求項3】 環状舌部の環状端面と環状シール体の内
周面とは、摺動自在に当接して対面している、請求項1
又は2に記載の単動型油圧シリンダ装置用ピストンシー
ル構造。
3. The annular end surface of the annular tongue portion and the inner peripheral surface of the annular seal body slidably abut and face each other.
Alternatively, the piston seal structure for a single-acting hydraulic cylinder device according to item 2.
【請求項4】 シールリング溝の軸方向長は、環状シー
ル体の軸方向長よりも長い、請求項1から3のいずれか
一項に記載の単動型油圧シリンダ装置用ピストンシール
構造。
4. The piston seal structure for a single-acting hydraulic cylinder device according to claim 1, wherein the axial length of the seal ring groove is longer than the axial length of the annular seal body.
JP06264538A 1994-10-04 1994-10-04 Piston seal structure for single-acting hydraulic cylinder device Expired - Fee Related JP3094811B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06264538A JP3094811B2 (en) 1994-10-04 1994-10-04 Piston seal structure for single-acting hydraulic cylinder device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06264538A JP3094811B2 (en) 1994-10-04 1994-10-04 Piston seal structure for single-acting hydraulic cylinder device

Publications (2)

Publication Number Publication Date
JPH08105408A true JPH08105408A (en) 1996-04-23
JP3094811B2 JP3094811B2 (en) 2000-10-03

Family

ID=17404663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06264538A Expired - Fee Related JP3094811B2 (en) 1994-10-04 1994-10-04 Piston seal structure for single-acting hydraulic cylinder device

Country Status (1)

Country Link
JP (1) JP3094811B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063003A (en) * 2010-09-20 2012-03-29 Advics Co Ltd Sealing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063003A (en) * 2010-09-20 2012-03-29 Advics Co Ltd Sealing device
CN102410372A (en) * 2010-09-20 2012-04-11 株式会社爱德克斯 Sealing apparatus
CN102410372B (en) * 2010-09-20 2015-12-16 株式会社爱德克斯 Seal arrangement
US9316317B2 (en) 2010-09-20 2016-04-19 Advics Co., Ltd. Sealing apparatus

Also Published As

Publication number Publication date
JP3094811B2 (en) 2000-10-03

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