JPH1164148A - Leak measuring instrument - Google Patents

Leak measuring instrument

Info

Publication number
JPH1164148A
JPH1164148A JP24031397A JP24031397A JPH1164148A JP H1164148 A JPH1164148 A JP H1164148A JP 24031397 A JP24031397 A JP 24031397A JP 24031397 A JP24031397 A JP 24031397A JP H1164148 A JPH1164148 A JP H1164148A
Authority
JP
Japan
Prior art keywords
piston
cylinder
pressure
leak
chamber
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
JP24031397A
Other languages
Japanese (ja)
Other versions
JP3649558B2 (en
Inventor
Shizuo Matsumura
松村静雄
Masatake Kawamura
川村昌毅
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.)
KYB Corp
Original Assignee
Kayaba 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 Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP24031397A priority Critical patent/JP3649558B2/en
Publication of JPH1164148A publication Critical patent/JPH1164148A/en
Application granted granted Critical
Publication of JP3649558B2 publication Critical patent/JP3649558B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To prevent foreign matter from being bitten between the sliding surfaces of a cylinder and a piston, and prevent the operation failure by sticking of the piston by providing annular recessed groves in stepped parts formed in the front and rear of the piston, and fitting sealants to the grooves to seal the sliding surfaces of the cylinder and the piston. SOLUTION: A piston 3 is slidably fitted into a cylinder 1, and pressure chambers A, B are formed of the cylinder 1, a piston 3, and a lid body 2 screwed to the end of the cylinder 1. When the pressure chamber A is pressurized, and a hydraulic equipment connected to the chamber B has no leak, the pressures of the chambers A, B are equal to each other, so that the piston 3 is not moved. When the hydraulic equipment to be measured is leaked, the pressure of the chamber B is lower than that of the chamber A, and the piston is slid on the chamber B side within the cylinder 1. Even if a chip or foreign matter is included in the chambers A, B and about to be nipped between sliding surfaces (h), the foreign matter is eliminated by dust seals 7a, 7b, the piston 3 is moved without sticking, and it is detected by a stroke sensor 6 according to the moving quantity to measure the leak of the equipment.

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】この発明は、リーク測定器に
関し、特に、コントロールバルブ等の油圧機器のリーク
量を測定するリーク測定器に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak measuring device, and more particularly to a leak measuring device for measuring a leak amount of a hydraulic device such as a control valve.

【0002】[0002]

【従来の技術】従来、この種のリーク測定器としては、
図3に示すように、シリンダ1内に摺動自在に設けたピ
ストン3と、ピストン3によりシリンダ1内に区画され
る2つの圧力室A,Bと、2つの油室の内一方の圧力室
Aをポートaを介して図示しない加圧機に接続し、他方
の圧力室Bを図示しない測定対象である油圧機器あるい
は油圧回路等にポートbを介して接続し、シリンダ1に
固定した検出棒4をシリンダ1の軸線1fに沿って成形
した検出穴3aに非接触状態を保って挿入し、検出棒4
に設けたコア4aと検出穴3a端に設けた検出コイル5
とからなる非接触ストロークセンサ6により、一方の圧
力室Aを加圧した時のピストン3の移動量で測定対象で
ある油圧機器あるいは油圧回路等のリーク量を測定する
ようにしたものがある。
2. Description of the Related Art Conventionally, as this kind of leak measuring device,
As shown in FIG. 3, a piston 3 slidably provided in the cylinder 1, two pressure chambers A and B partitioned by the piston 3 in the cylinder 1, and one of two oil chambers A is connected to a pressurizing machine (not shown) via a port a, and the other pressure chamber B is connected to a hydraulic device or a hydraulic circuit or the like to be measured (not shown) via a port b. Into the detection hole 3a formed along the axis 1f of the cylinder 1 while maintaining the non-contact state.
Core 4a provided at the end and the detection coil 5 provided at the end of the detection hole 3a
There is a non-contact stroke sensor 6 configured to measure the amount of leakage of a hydraulic device or a hydraulic circuit to be measured by the movement amount of the piston 3 when one of the pressure chambers A is pressurized.

【0003】[0003]

【発明が解決しようとする課題】ところで、上記従来例
のものでは、シリンダ内をピストンが自在に摺動すると
ともにシリンダとピストンとの摺動面からの流体の漏れ
を防止するために、シリンダの内周面とピストンの外周
面とを高精度に加工してあるが、測定対象である油圧機
器にあっては、機器内に加工に伴って生じる切り粉や異
物が十分に取り除けず残っていたり、作業中に異物等が
誤って混入したりしており、このためシリンダ内に切り
粉や異物が混入して、シリンダ内周面とピストン外周面
との摺動面に噛み込み、ピストンがスティックしてしま
い、ピストンが作動不良になると言う問題があった。そ
こで、この発明は、シリンダ内周とピストン外周との摺
動面に異物が噛み込まないようにして、ピストンのステ
ィックによる作動不良を防止することを目的とする。
By the way, in the above-mentioned prior art, the piston is slid freely in the cylinder and the leakage of the fluid from the sliding surface between the cylinder and the piston is prevented. The inner peripheral surface and the outer peripheral surface of the piston are machined with high precision.However, in the case of the hydraulic equipment to be measured, chips and foreign substances generated by the machining remain in the equipment without being sufficiently removed. During operation, foreign matter or the like is mistakenly mixed in.Therefore, cutting chips or foreign matter is mixed in the cylinder and bites into the sliding surface between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston. There was a problem that the piston would malfunction. Accordingly, it is an object of the present invention to prevent foreign matter from being caught in a sliding surface between an inner periphery of a cylinder and an outer periphery of a piston, thereby preventing malfunction of the piston caused by a stick.

【0004】[0004]

【課題を解決するための手段】第1の発明では、シリン
ダと、シリンダ内を摺動自在に嵌挿するピストンと、ピ
ストンによりシリンダ内に区画される2つの圧力室と、
一方の圧力室を加圧機に接続するようシリンダに設けら
れるポートと、他方の圧力室を測定対象である油圧機器
に接続するようシリンダに設けられるポートと、シリン
ダの軸線に沿ってピストンに成形される検出穴と、検出
穴に非接触状態で挿入されシリンダの一端に固定される
検出棒と、検出棒に設けたコアと検出穴端に設けたコイ
ルとからなるストロークセンサとを備え、一方の圧力室
を加圧したときのピストンの移動量で測定対象である油
圧機器のリーク量を測定するリーク測定器において、前
記ピストンの前後に段径部を成形し、この段径部に環状
の凹溝を設け、環状の凹溝にシール部材を嵌挿してシリ
ンダとピストンとの摺動面をシールする。
According to a first aspect of the present invention, there is provided a cylinder, a piston slidably inserted in the cylinder, and two pressure chambers defined in the cylinder by the piston.
A port provided on the cylinder to connect one pressure chamber to the pressurizing machine, a port provided on the cylinder to connect the other pressure chamber to the hydraulic equipment to be measured, and a piston formed along the cylinder axis. A detection hole inserted into the detection hole in a non-contact state and fixed to one end of a cylinder; and a stroke sensor including a core provided on the detection rod and a coil provided at an end of the detection hole. In a leak measuring device for measuring a leak amount of a hydraulic device to be measured by an amount of movement of a piston when a pressure chamber is pressurized, a step diameter portion is formed before and after the piston, and an annular recess is formed in the step diameter portion. A groove is provided, and a seal member is inserted into the annular groove to seal a sliding surface between the cylinder and the piston.

【0005】第2の発明では、ピストンに圧力室と段径
部とを連通する連通路を設け、段径部に設けた環状の凹
溝に嵌挿するシール部材の前後の圧力が同圧になるよう
にする。
In the second invention, the piston is provided with a communication passage for communicating the pressure chamber with the step diameter portion, and the pressure before and after the seal member inserted into the annular groove provided in the step diameter portion becomes the same pressure. To be.

【0006】[0006]

【発明の実施の形態】以下、図面に基づいて本発明の実
施の形態について説明するに、前記従来例と同一の構成
要素に対しては同一の名称、符号を付して説明する。こ
の実施の形態に関わるリーク測定器は、図1に示すよう
に、シリンダ1内には、ピストン3が摺動自在に嵌挿さ
れ、シリンダ1,ピストン3,シリンダ1端に螺合する
蓋体2とで2つ圧力室A,Bが画成されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, a leak measuring instrument according to this embodiment has a piston 3 slidably fitted in a cylinder 1 and a screw body screwed to one end of a cylinder 1, a piston 3 and a cylinder 1. 2, two pressure chambers A and B are defined.

【0007】シリンダ1には、一方の圧力室Aを図示し
ない加圧機側に接続するように設けられるポートaと、
他方の圧力室Bを図示しない油圧機器に接続するように
設けられるポートbとが成形されている。
The cylinder 1 has a port a provided to connect one pressure chamber A to a pressurizing machine (not shown),
A port b provided to connect the other pressure chamber B to a hydraulic device (not shown) is formed.

【0008】ピストン3には、シリンダ1の中心軸線1
f方向の前後に段径部3bが設けられ、段径部3bには
環状の凹溝3cが成形されている。
The piston 3 has a central axis 1
A step diameter portion 3b is provided before and after in the f direction, and an annular concave groove 3c is formed in the step diameter portion 3b.

【0009】環状の凹溝3cには、ダストシール7a,
7bが装着されており、シリンダ1内とピストン3とを
シールするようになっている。
In the annular groove 3c, dust seals 7a,
7b is mounted so as to seal the inside of the cylinder 1 and the piston 3.

【0010】また、シリンダ1の中心軸線1fに沿って
検出穴3aが成形されており、この検出穴3aの一端側
には検出コイル5が装着されている。
A detection hole 3a is formed along the central axis 1f of the cylinder 1, and a detection coil 5 is mounted on one end of the detection hole 3a.

【0011】シリンダ1の端に螺合して検出棒4が固定
されており、ピストン3に成形した検出穴3aに非接触
状態を保って嵌挿されている。
A detection rod 4 is fixedly screwed to an end of the cylinder 1 and is fitted into a detection hole 3a formed in the piston 3 while keeping a non-contact state.

【0012】検出穴3aの一端側に設けられた検出コイ
ル5と検出棒4に設けたコア4aとでピストン3のスト
ロークを検出するストロークセンサ6を構成している。
A detection coil 5 provided at one end of the detection hole 3a and a core 4a provided on the detection rod 4 constitute a stroke sensor 6 for detecting the stroke of the piston 3.

【0013】ピストン3は、圧力室Aにおける圧力Pa
と圧力室Bにおける圧力Pbとに差圧(Pa−Pb)が
生じると、圧力の高い圧力室A側から低い圧力室B側方
向(図中右方向)に移動し、移動することによりピスト
ン3のストロークをストロークセンサ6で検出するよう
になっている。
The piston 3 has a pressure Pa in the pressure chamber A.
When a pressure difference (Pa−Pb) is generated between the pressure chamber B and the pressure Pb in the pressure chamber B, the piston 3 moves from the high pressure chamber A side to the low pressure chamber B side (rightward in the drawing), and the piston 3 Is detected by the stroke sensor 6.

【0014】そして、ピストン3の移動量に応じてスト
ロークセンサ6で検出された信号を図示しない制御部で
リーク量に換算して、測定対象である油圧機器の漏れを
測定する。
Then, a signal detected by the stroke sensor 6 in accordance with the amount of movement of the piston 3 is converted into a leak amount by a control unit (not shown), and the leak of the hydraulic equipment to be measured is measured.

【0015】また、シリンダ1内は、ピストン3が自在
に摺動するとともにシリンダ1の内周1aとピストン3
の外周3dとの摺動面hから漏れないようなハメアイに
なるよう高精度の加工がなされている。
In the cylinder 1, the piston 3 slides freely and the inner circumference 1a of the cylinder 1 and the piston 3
High-precision machining is performed so as to prevent leakage from the sliding surface h with the outer periphery 3d.

【0016】次にその作動について説明する。いま、例
えば、一方の圧力室Aが図示しない加圧機により加圧さ
れ、他方の圧力室Bに接続された測定対象である図示し
ない油圧機器に漏れがなければ、圧力室Aの圧力Paと
圧力室Bの圧力Pbとは同圧(Pa=Pb)となり、こ
のため、ピストン3は移動せず、停止したままの状態を
保ち、ストロークセンサ6による油圧機器の漏れは検出
されない。
Next, the operation will be described. Now, for example, if one of the pressure chambers A is pressurized by a pressurizer (not shown) and the hydraulic device (not shown) to be measured connected to the other pressure chamber B has no leak, the pressure Pa and the pressure of the pressure chamber A The pressure Pb of the chamber B is the same as the pressure Pb (Pa = Pb). Therefore, the piston 3 does not move, remains stopped, and the stroke sensor 6 does not detect leakage of hydraulic equipment.

【0017】そして、測定対象である油圧機器に漏れが
発生すると、圧力室Bの圧力Pbが圧力室Aの圧力Pa
より低く(Pa>Pb)なり、ピストン3の左右に圧力
差(Pa−Pb)が生じて、ピストン3は、シリンダ1
内を図中右方向に摺動する。
If a leak occurs in the hydraulic equipment to be measured, the pressure Pb in the pressure chamber B becomes equal to the pressure Pa in the pressure chamber A.
Lower (Pa> Pb), and a pressure difference (Pa−Pb) occurs on the left and right sides of the piston 3, and the piston 3
Inside to the right in the figure.

【0018】その際に、仮に、シリンダ1内の圧力室
A,Bに切り粉や異物か混入していて、ピストン3とシ
リンダ1との摺動面hに挟まれそうになっても、ピスト
ン3に設けたダストシール7a,7bでこれ等の切り粉
や異物を排除しながらスティックすることなくスムーズ
に移動し、ピストン3の移動量に応じてストロークセン
サ6で検出された信号を図示しない制御部でリーク量に
換算して、測定対象である油圧機器の漏れを測定するよ
うにしてある。
At this time, even if cutting chips or foreign matter is mixed in the pressure chambers A and B in the cylinder 1 and is likely to be caught by the sliding surface h between the piston 3 and the cylinder 1, the piston The dust seals 7a and 7b provided on the cylinder 3 move smoothly without sticking while removing these chips and foreign substances, and output signals detected by the stroke sensor 6 according to the amount of movement of the piston 3 to a control unit (not shown). Is converted into a leak amount, and the leak of the hydraulic equipment to be measured is measured.

【0019】このように、ピストン3の移動量で測定対
象である油圧機器のリーク量を測定するリーク測定器で
あって、前記ピストン3の前後に段径部3bを成形し、
この段径部3bに環状の凹溝3cを設け、環状の凹溝3
cにシール部材7a,7bを嵌挿してシリンダ1とピス
トン3との摺動面hをシールするようにしたので、シリ
ンダ1内の圧力室A,Bに切り粉や異物か混入して ピ
ストン3とシリンダ1との摺動面hに切り粉や異物が挟
まれそうになっても、ピストン3は、ピストン3に設け
たダストシール7a,7bでこれ等の切り粉や異物を排
除しながら移動するので、シリンダ内周面1aとピスト
ン1の外周面3dとの摺動面hに切り粉や異物が噛み込
むこともなく、ピストン3はスティックせず、スムーズ
に移動し、ピストン3の作動不良を防止するできる。
As described above, the present invention is a leak measuring device for measuring a leak amount of a hydraulic device to be measured by an amount of movement of a piston 3, wherein a step diameter portion 3b is formed before and after the piston 3,
An annular concave groove 3c is provided in the step diameter portion 3b.
The sealing members 7a and 7b are inserted into the cylinder 1c to seal the sliding surface h between the cylinder 1 and the piston 3, so that chips or foreign matter is mixed in the pressure chambers A and B in the cylinder 1 so that the piston 3 Even if chips or foreign matter is likely to be caught in the sliding surface h between the cylinder and the cylinder 1, the piston 3 moves while eliminating such chips and foreign matter by the dust seals 7a and 7b provided on the piston 3. Therefore, there is no possibility that cutting chips or foreign matter may bite into the sliding surface h between the inner peripheral surface 1a of the cylinder and the outer peripheral surface 3d of the piston 1, the piston 3 does not stick, and moves smoothly, and the malfunction of the piston 3 may be reduced. Can be prevented.

【0020】次に、第2図に示す第2の実施の形態は、
圧力室と段径部とを連通する導通路を設けるようにした
構成のみを相違させたもので、その他は第1の実施の形
態と同じであり、ここでは、相違する構成についてのみ
説明し、他の構成要素の詳細については省略する。
Next, a second embodiment shown in FIG.
Only the configuration in which a conduction path communicating the pressure chamber and the step diameter portion is provided is different, and the other configuration is the same as the first embodiment. Here, only the different configuration will be described. Details of other components are omitted.

【0021】そこで、第2の実施の形態のリーク測定器
は、図2に示すように、ピストン3にピストン3の検出
穴3aと段径部3bとを連通する通路8aを設けて、圧
力室Aの圧力Paを段径部3bに導入し、環状の凹溝3
cに装着したダストシール7aの前後が同圧になるよう
にし、他方、圧力室B側と段径部3bとを連通する通路
8bを設け、圧力室Bの圧力Pbを段径部3bに導入
し、環状の凹溝3cに装着したダストシール7bの前後
が同圧になるようにしてある。
Therefore, in the leak measuring device according to the second embodiment, as shown in FIG. 2, the piston 3 is provided with a passage 8a for communicating the detection hole 3a of the piston 3 with the step diameter portion 3b, and the pressure chamber is provided. A pressure Pa is introduced into the step diameter portion 3b, and the annular concave groove 3
c, the front and rear sides of the dust seal 7a are made to have the same pressure. On the other hand, a passage 8b communicating the pressure chamber B side and the step diameter part 3b is provided, and the pressure Pb of the pressure chamber B is introduced into the step diameter part 3b. The same pressure is applied to the front and rear of the dust seal 7b mounted on the annular groove 3c.

【0022】そして、測定対象である油圧機器に漏れが
発生すると、圧力室Bの圧力Pbが圧力室Aの圧力Pa
より低く(Pa>Pb)なり、ピストン3の左右に圧力
差が生じて、ピストン3は、シリンダ1内を図中右方向
に摺動する際に、環状の凹溝3cに装着したダストシー
ル7aの前後は、圧力室Aの圧力Paが導入され、同圧
となり、また、ダストシール7bの前後は、圧力室Bの
圧力Pbが導入され、同圧となり、ダストシール部材7
a,7bは圧力による変形を受けることがなく作用し、
ピストン3は、シリンダ1内をスムーズに移動すること
ができる。
When a leak occurs in the hydraulic equipment to be measured, the pressure Pb in the pressure chamber B becomes equal to the pressure Pa in the pressure chamber A.
The pressure becomes lower (Pa> Pb), and a pressure difference is generated between the left and right sides of the piston 3. When the piston 3 slides in the cylinder 1 rightward in the figure, the dust seal 7a attached to the annular groove 3c is closed. Before and after the pressure Pa of the pressure chamber A is introduced and the same pressure is applied, and before and after the dust seal 7b, the pressure Pb of the pressure chamber B is introduced and the same pressure is applied.
a and 7b operate without being deformed by pressure,
The piston 3 can move smoothly in the cylinder 1.

【0023】[0023]

【発明の効果】第1の発明によれば、ピストンの移動量
で測定対象である油圧機器のリーク量を測定するリーク
測定器であって、前記ピストンの前後に段径部を成形
し、この段径部に環状の凹溝を設け、環状の凹溝にシー
ル部材を嵌挿してシリンダとピストンとの摺動面をシー
ルするようにしたので、シリンダ内の圧力室に切り粉や
異物か混入して ピストンとシリンダとの摺動面に挟ま
れそうになっても、ピストンに設けたダストシールでこ
れ等の切り粉や異物を排除しながら移動するので、シリ
ンダ内周面とピストン外周面との摺動面に切り粉や異物
が噛み込みことがなくなり、ピストンがスティックせ
ず、スムーズに移動し、ピストンの作動不良を防止し、
測定対象である油圧機器のリーク量を的確に測定するこ
とができる。
According to the first aspect of the present invention, there is provided a leak measuring device for measuring a leak amount of a hydraulic device to be measured by a movement amount of a piston, wherein a step diameter portion is formed before and after the piston. An annular groove is provided in the step diameter part, and a seal member is inserted into the annular groove to seal the sliding surface between the cylinder and the piston, so that chips or foreign matter is mixed in the pressure chamber in the cylinder. As a result, even if it is likely to be caught between the sliding surfaces of the piston and the cylinder, the dust seal provided on the piston moves while eliminating such chips and foreign matter. Chips and foreign matter do not bite into the sliding surface, the piston does not stick and moves smoothly, preventing malfunction of the piston,
The leak amount of the hydraulic equipment to be measured can be accurately measured.

【0024】第2の発明によれば、ピストンに圧力室と
段径部とを連通する導通路を設け、段径部に設けた環状
の凹溝に嵌挿するダストシール部材の前後の圧力が同圧
になるようにしたので、前記第1の実施の形態と同様の
作用効果を奏するとともに、シール部材は圧力による変
形を受けることがなく良好に作用し、ピストンは、シリ
ンダ内をスムーズに移動することができる効果がある。
According to the second aspect of the present invention, the piston is provided with a conduction path for communicating the pressure chamber with the step diameter portion, and the pressure before and after the dust seal member inserted into the annular groove provided in the step diameter portion is the same. Since the pressure is applied, the same operation and effect as those of the first embodiment are obtained, and the seal member works well without being deformed by the pressure, and the piston moves smoothly in the cylinder. There is an effect that can be.

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

【図1】本発明の実施の形態を示すリーク測定器の正面
断面図である。
FIG. 1 is a front sectional view of a leak measuring instrument according to an embodiment of the present invention.

【図2】他の実施の形態を示すリーク測定器の正面断面
図である。
FIG. 2 is a front sectional view of a leak measuring instrument according to another embodiment.

【図3】従来例を示すリーク測定器の正面断面図であ
る。
FIG. 3 is a front sectional view of a leak measuring device showing a conventional example.

【符号の説明】[Explanation of symbols]

1 シリンダ 1a 内周 1f シリンダの中心軸線 2 蓋体 3 ピストン 3a 検出穴 3b 段径部 3c 環状の凹溝 3d 外周 4 検出棒 4a 検出コア 5 検出コイル 6 ストロークセンサ 7a,7b シール部材 8a,8b 通路 A,B 圧力室 a,b ポート Pa 圧力室Aの圧力 Pb 圧力室Bの圧力 h 摺動面 DESCRIPTION OF SYMBOLS 1 Cylinder 1a Inner circumference 1f Center axis of cylinder 2 Lid 3 Piston 3a Detection hole 3b Step diameter part 3c Annular groove 3d Outer circumference 4 Detection rod 4a Detection core 5 Detection coil 6 Stroke sensor 7a, 7b Seal member 8a, 8b Passage A, B Pressure chamber a, b port Pa Pressure in pressure chamber A Pb Pressure in pressure chamber B h Sliding surface

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】シリンダと、シリンダ内を摺動自在に嵌挿
するピストンと、ピストンによりシリンダ内に区画され
る2つの圧力室と、一方の圧力室を加圧機に接続するよ
うシリンダに設けられるポートと、他方の圧力室を測定
対象である油圧機器に接続するようシリンダに設けられ
るポートと、シリンダの軸線に沿ってピストンに成形さ
れる検出穴と、検出穴に非接触状態で挿入されシリンダ
の一端に固定される検出棒と、検出棒に設けたコアと検
出穴端に設けたコイルとからなるストロークセンサとを
備え、一方の圧力室を加圧したときのピストンの移動量
で測定対象である油圧機器のリーク量を測定するリーク
測定器において、前記ピストンの前後に段径部を成形
し、この段径部に環状の凹溝を設け、環状の凹溝にシー
ル部材を嵌挿してシリンダとピストンとの摺動面をシー
ルするようにしたことを特徴とするリーク測定器。
1. A cylinder, a piston slidably fitted in the cylinder, two pressure chambers defined in the cylinder by the piston, and one of the pressure chambers provided in the cylinder so as to be connected to a pressurizing machine. A port, a port provided in the cylinder to connect the other pressure chamber to the hydraulic device to be measured, a detection hole formed in the piston along the cylinder axis, and a cylinder inserted in a non-contact state with the detection hole. A detection rod fixed to one end of the sensor, and a stroke sensor including a core provided on the detection rod and a coil provided at an end of the detection hole, and a moving amount of the piston when one of the pressure chambers is pressurized is measured. In a leak measuring device for measuring the leak amount of a hydraulic device, a stepped portion is formed before and after the piston, an annular groove is provided in the stepped portion, and a seal member is inserted into the annular groove. Shi Sunda and leakage measuring device, characterized in that the sliding surfaces of the piston and adapted to seal.
【請求項2】前記ピストンに圧力室と段径部とを連通す
る連通路を設け、段径部に設けた環状の凹溝に嵌挿する
シール部材の前後の圧力が同圧になるようにしたことを
特徴とする請求項1に記載のリーク測定器。
2. A communication path for communicating a pressure chamber with a stepped portion of the piston is provided so that the pressure before and after a seal member inserted into an annular groove provided in the stepped portion has the same pressure. The leak measuring device according to claim 1, wherein:
JP24031397A 1997-08-21 1997-08-21 Leak measuring instrument Expired - Fee Related JP3649558B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24031397A JP3649558B2 (en) 1997-08-21 1997-08-21 Leak measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24031397A JP3649558B2 (en) 1997-08-21 1997-08-21 Leak measuring instrument

Publications (2)

Publication Number Publication Date
JPH1164148A true JPH1164148A (en) 1999-03-05
JP3649558B2 JP3649558B2 (en) 2005-05-18

Family

ID=17057613

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24031397A Expired - Fee Related JP3649558B2 (en) 1997-08-21 1997-08-21 Leak measuring instrument

Country Status (1)

Country Link
JP (1) JP3649558B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110553590A (en) * 2018-05-30 2019-12-10 厦门永裕机械工业有限公司 Piston detection method with booster feedback disc function and device thereof
CN112556936A (en) * 2020-12-28 2021-03-26 徐州金鼎恒立液压件有限公司 Hydraulic sealing comprehensive experiment table and experiment method
CN113932997A (en) * 2021-10-29 2022-01-14 徐州徐工液压件有限公司 Static seal combined test device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110553590A (en) * 2018-05-30 2019-12-10 厦门永裕机械工业有限公司 Piston detection method with booster feedback disc function and device thereof
CN110553590B (en) * 2018-05-30 2024-03-19 厦门永裕机械工业有限公司 Piston detection method and device with booster feedback disc function
CN112556936A (en) * 2020-12-28 2021-03-26 徐州金鼎恒立液压件有限公司 Hydraulic sealing comprehensive experiment table and experiment method
CN113932997A (en) * 2021-10-29 2022-01-14 徐州徐工液压件有限公司 Static seal combined test device

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Publication number Publication date
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