JPH0814203A - Pressure regulation device - Google Patents
Pressure regulation deviceInfo
- Publication number
- JPH0814203A JPH0814203A JP6149654A JP14965494A JPH0814203A JP H0814203 A JPH0814203 A JP H0814203A JP 6149654 A JP6149654 A JP 6149654A JP 14965494 A JP14965494 A JP 14965494A JP H0814203 A JPH0814203 A JP H0814203A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- piston
- switch
- hydraulic circuit
- contact
- 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
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、油圧工具等の油圧源に
使用される増圧器を用いた増圧回路において、油圧力を
設定値以内に規制する圧力規制装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating device for regulating hydraulic pressure within a set value in a pressure boosting circuit using a pressure booster used for a hydraulic power source such as a hydraulic tool.
【０００２】[0002]
【従来の技術】従来、この種の圧力規制装置としては、
例えば本出願人が先に開示したようなものがある（実開
平２ー１０７８０２号公報参照）。この従来の圧力規制
装置は、図７に示すように、油圧ポンプ（図示せず）か
ら送出された作動油を増圧器（図示せず）を用いて増圧
した１次側油圧回路３内の圧油が所定圧力以上になると
開いて、１次側油圧回路３内から圧油を流出し、１次側
油圧回路３内の圧力を低下させるリリーフバルブ１と、
このリリーフバルブ１から流出した圧油の圧力を受けて
増圧ＯＮ／ＯＦＦの切換え信号を出力する増圧ＯＮ／Ｏ
ＦＦ発信機構２１とから構成されている。2. Description of the Related Art Conventionally, as this type of pressure regulating device,
For example, there is one disclosed by the present applicant (see Japanese Utility Model Laid-Open No. 2-107802). As shown in FIG. 7, this conventional pressure regulating device is provided in a primary-side hydraulic circuit 3 in which hydraulic oil sent from a hydraulic pump (not shown) is pressurized by a pressure booster (not shown). A relief valve 1 that opens when the pressure oil reaches a predetermined pressure or more and flows out from the primary side hydraulic circuit 3 to reduce the pressure in the primary side hydraulic circuit 3;
Pressure increase ON / O that receives the pressure of pressure oil flowing out from the relief valve 1 and outputs a pressure increase ON / OFF switching signal
It is composed of an FF transmission mechanism 21.
【０００３】リリーフバルブ１は、以下のように構成さ
れている。ボディ２には、その下端から上方へ向かって
１次側油圧回路３を穿設し、この１次側油圧回路３の上
端を拡径して段部４ａを形成し、さらにこの段部４ａか
ら上方へ開いた所定深さの開口部４を穿設してある。こ
の開口部４の下端部には、１次側油圧回路３に連通した
小孔５ａを軸心上に有するディスク状のバルブシート５
を装着し、さらにこのバルブシート５の上端面に当接し
上方へ延設した筒状のバルブ本体６を開口部４に嵌合し
てある。The relief valve 1 is constructed as follows. A primary side hydraulic circuit 3 is bored upward from the lower end of the body 2 and the upper end of the primary side hydraulic circuit 3 is expanded to form a step 4a. An opening 4 having a predetermined depth opened upward is provided. At the lower end of the opening 4, a disc-shaped valve seat 5 having a small hole 5a communicating with the primary hydraulic circuit 3 on the axis thereof.
And a cylindrical valve body 6 that is in contact with the upper end surface of the valve seat 5 and extends upward is fitted in the opening 4.
【０００４】バルブ本体６内部の下部には、バルブシー
ト５の小孔５ａを開閉するポペット弁７ａを下端に有す
るディスク状のバルブステム７を、バルブ本体６の内周
面に上下方向へ摺動可能に嵌合させ、またバルブ本体６
上部の内周面には、上下移動可能にプラグ８を螺着して
ある。さらにバルブ本体６の内部には、バルブステム７
の上端とプラグ８の下端の間に挟まれた圧縮バネ９を備
え、プラグ８により圧縮バネ９の弾性付勢力を調整し、
バルブステム７をバルブシート５に所定の圧力で押圧す
るようになっている。そして、ポペット弁７ａをバルブ
シート５の小孔５ａに当接して小孔５ａを遮断すると、
バルブシート５の上端面とバルブ本体６の内周面とバル
ブステム７の下端面で囲まれた油室１０を形成するよう
になっている。A disc-shaped valve stem 7 having a poppet valve 7a at the lower end for opening and closing the small hole 5a of the valve seat 5 is slid vertically on the inner peripheral surface of the valve body 6 in the lower portion inside the valve body 6. Fit as much as possible, and valve body 6
A plug 8 is screwed onto the inner peripheral surface of the upper part so as to be vertically movable. Further, inside the valve body 6, the valve stem 7
Is provided between the upper end of the plug 8 and the lower end of the plug 8, and the elastic biasing force of the compression spring 9 is adjusted by the plug 8.
The valve stem 7 is pressed against the valve seat 5 with a predetermined pressure. Then, when the poppet valve 7a is brought into contact with the small hole 5a of the valve seat 5 to block the small hole 5a,
An oil chamber 10 surrounded by the upper end surface of the valve seat 5, the inner peripheral surface of the valve body 6 and the lower end surface of the valve stem 7 is formed.
【０００５】さらに、バルブ本体６の下部には、上下方
向に離間した上段の孔６ａと下段の孔６ｂを径方向へ穿
設してあり、これらの孔６ａ、６ｂは、バルブステム７
が下降してポペット弁７ａがバルブシート５の小孔５ａ
を遮断したとき（リリーフバルブ１が閉じたとき）に、
下段の孔６ｂがバルブステム７により遮断され、逆にバ
ルブステム７が上昇して弁７ａが開いたとき（リリーフ
バルブ１が開いたとき）に、上下段の孔６ａ、６ｂが共
に開くようになっている。Further, an upper hole 6a and a lower hole 6b, which are vertically separated from each other, are formed in the lower portion of the valve body 6 in the radial direction. These holes 6a and 6b are formed in the valve stem 7.
Is lowered and the poppet valve 7a is moved to the small hole 5a of the valve seat 5.
Shut off (when the relief valve 1 is closed),
The lower holes 6b are blocked by the valve stem 7, and conversely, when the valve stem 7 rises and the valve 7a opens (when the relief valve 1 opens), the upper holes 6a and 6b are opened together. Has become.
【０００６】さらに、このような構成のリリーフバルブ
１を組付けたときには、バルブシート５の下端面の小孔
５ａが開口部４の下端に穿設した１次側油圧回路３に連
通すると共に、リリーフバルブ１が開いたときには、バ
ルブ本体６の上段の孔６ａと下段の孔６ｂが、それぞれ
開口部４から径方向へ穿設した中回路１３に連通するよ
うになっている。Further, when the relief valve 1 having such a structure is assembled, the small hole 5a on the lower end surface of the valve seat 5 communicates with the primary hydraulic circuit 3 formed at the lower end of the opening 4. When the relief valve 1 is opened, the upper hole 6a and the lower hole 6b of the valve body 6 communicate with the middle circuit 13 that is bored from the opening 4 in the radial direction.
【０００７】また、増圧ＯＮ／ＯＦＦ発信機構２１は、
以下のように構成されている。ボディ２の前側面（図７
において右側面）Ｆ1 から後方へ（すなわち中回路１３
ヘ向かって）所定深さのピストンホルダ収納孔２２を穿
設し、このピストンホルダ収納孔２２の後方を縮径して
段部２２ａを形成すると共に、所定深さのピストン挿通
孔２３を穿設し、さらに、このピストン挿通孔２３の後
方を縮径して段部２３ａを形成すると共に、ピストン挿
通孔２３を中回路１３に連通させている。Further, the pressure increase ON / OFF transmission mechanism 21 is
It is configured as follows. Front side of body 2 (Fig. 7
At the right side) from F 1 to the rear (that is, the middle circuit 13
(To f) A piston holder housing hole 22 having a predetermined depth is bored, the rear side of the piston holder housing hole 22 is reduced in diameter to form a step portion 22a, and a piston insertion hole 23 having a predetermined depth is bored. Further, the diameter of the rear portion of the piston insertion hole 23 is reduced to form a step portion 23a, and the piston insertion hole 23 is communicated with the middle circuit 13.
【０００８】さらに、段部２２ａの近傍のピストンホル
ダ収納孔２２には、ボディ２の外部へ通じた２次側油圧
回路２８を接続している。Further, a secondary side hydraulic circuit 28 communicating with the outside of the body 2 is connected to the piston holder housing hole 22 near the step portion 22a.
【０００９】ピストン挿通孔２３には、ピストンホルダ
収納孔２２を挿通したピストン２４を装着してある。こ
のピストン２４は、前方へ延設されたロッド部２４ａ
と、このロッド部２４ａの後方を拡径して形成されたデ
ィスク状のヘッド部２４ｂとを有して構成されている。
ヘッド部２４ｂの前方のピストンホルダ収納孔２２に
は、スプリングホルダとしてのプラグ２５が前後方向へ
移動可能に螺着されると共に、ロッド部２４ａがプラグ
２５の軸心上に穿設されたロッド挿通孔２５ａを挿通し
て前後方向へ摺動可能になっている。A piston 24, which is inserted through the piston holder housing hole 22, is attached to the piston insertion hole 23. The piston 24 has a rod portion 24a extending forward.
And a disk-shaped head portion 24b formed by expanding the diameter of the rear portion of the rod portion 24a.
A plug 25, which serves as a spring holder, is screwed into the piston holder housing hole 22 in the front of the head portion 24b so as to be movable in the front-rear direction, and a rod portion 24a is inserted through a rod inserted in the axial center of the plug 25. It is slidable in the front-rear direction through the hole 25a.
【００１０】さらに、ピストンホルダ収納孔２２に装着
されたピストン２４のヘッド部２４ｂとプラグ２５の間
には、圧縮バネ２６を挟み込みピストン２４を後方へ押
圧している。さらに、ピストン２４のロッド部２４ａの
前方には、ピストン２４の前端がマイクロスイッチ２７
の接点２７ａに当接し得るようにマイクロスイッチ２７
を取り付けている。Further, a compression spring 26 is sandwiched between the head portion 24b of the piston 24 mounted in the piston holder housing hole 22 and the plug 25 to push the piston 24 rearward. Further, in front of the rod portion 24a of the piston 24, the front end of the piston 24 has a micro switch 27.
Of the micro switch 27 so that it can come into contact with the contact 27a of the
Is installed.
【００１１】このような増圧ＯＮ／ＯＦＦ発信機構２１
では、１次側油圧回路３内の圧力が所定圧力以上になる
と、１次側油圧回路３内の圧力がバルブシート５の小孔
５ａを介してバルブステム７のポペット弁７ａに作用
し、ポペット弁７ａを押し上げて開くと同時に、バルブ
本体６の上段の孔６ａを遮断することなく、下段の孔６
ｂを開く。これにより、１次側油圧回路３内の圧力はバ
ルブシート５の小孔５ａ、油室１０、下段の孔６ｂを介
して中回路１３に伝達され、圧縮バネ２６の付勢力に抗
して、ピストン２４を前進させる。このときピストン２
４のロッド部２４ａの前端がマイクロスイッチ２７の接
点２７ａを押圧し、例えばスイッチＯＮの状態にするよ
うになっている。また、このスイッチＯＮの状態のとき
に、中回路１３がピストン挿通孔２３を介して２次側油
圧回路２８に連通され中回路１３内の圧油がピストン挿
通孔２３を通って２次側油圧回路２８に流出されるよう
になっている。Such a pressure increasing ON / OFF transmitting mechanism 21
Then, when the pressure in the primary side hydraulic circuit 3 becomes equal to or higher than a predetermined pressure, the pressure in the primary side hydraulic circuit 3 acts on the poppet valve 7a of the valve stem 7 via the small hole 5a of the valve seat 5, and the poppet At the same time as the valve 7a is pushed up and opened, the upper hole 6a of the valve body 6 is not blocked and the lower hole 6a is not blocked.
Open b. Thereby, the pressure in the primary side hydraulic circuit 3 is transmitted to the middle circuit 13 through the small hole 5a of the valve seat 5, the oil chamber 10 and the lower hole 6b, and resists the biasing force of the compression spring 26, The piston 24 is advanced. At this time piston 2
The front end of the rod portion 24a of No. 4 presses the contact 27a of the micro switch 27 to bring the switch ON, for example. Further, when the switch is in the ON state, the middle circuit 13 communicates with the secondary side hydraulic circuit 28 via the piston insertion hole 23 so that the pressure oil in the middle circuit 13 passes through the piston insertion hole 23 and the secondary side hydraulic pressure. It is designed to be discharged to the circuit 28.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら、この従
来の圧力規制装置にあっては、規制対象の１次側油圧回
路３内の油圧力を一定以上高く設定し過ぎると、リリー
フバルブ１から中回路１３へ流出する油量が多くなり、
ピストン２４の前進速度が速くなり過ぎてしまう。この
ため、ピストン２４がマイクロスイッチ２７の接点２７
ａに当接する際に、マイクロスイッチ２７の接点２７ａ
に衝撃力を与え，マイクロスイッチ２７を早期に故障さ
せてしまうという問題点があった。However, in this conventional pressure regulating device, if the hydraulic pressure in the regulated primary side hydraulic circuit 3 is set too high by a certain level or more, the relief valve 1 to the middle circuit will be closed. The amount of oil flowing out to 13 increases,
The forward speed of the piston 24 becomes too fast. Therefore, the piston 24 contacts the contact 27 of the microswitch 27.
contact point 27a of the microswitch 27 when abutting on a
However, there is a problem in that the micro switch 27 is damaged at an early stage by applying an impact force to the.
【００１３】本発明は、このような従来の問題点に着目
してなされたもので、１次側油圧回路内の油圧力が所定
圧力より高くなり過ぎ、リリーフバルブから中回路へ流
出する油量が増大することがあっても、マイクロスイッ
チに衝撃力を与えることがなく、マイクロスイッチの早
期の故障を防止できる圧力規制装置の提供を目的とす
る。The present invention has been made by paying attention to such a conventional problem, and the amount of oil flowing out from the relief valve to the intermediate circuit due to the oil pressure in the primary side hydraulic circuit becoming higher than a predetermined pressure. It is an object of the present invention to provide a pressure regulation device that can prevent an early failure of the microswitch without giving an impact force to the microswitch even if the pressure increases.
【００１４】[0014]
【課題を解決するための手段】上記目的を達成するため
に本発明は、油圧ポンプからの送油を増圧器を用いて増
圧した圧油を導く１次側油圧回路と、前記１次側油圧回
路に接続され、前記１次側油圧回路内の圧力が所定圧力
未満のときは閉じて前記１次側油圧回路内の圧油を遮断
し、前記１次側油圧回路内の圧力が所定圧力以上のとき
は開いて前記１次側油圧回路内の圧油を吐出するリリー
フバルブと、前記リリーフバルブの開閉に連動してスイ
ッチをＯＮ／ＯＦＦ作動させ、増圧ＯＮ／ＯＦＦの切換
え信号を出力する増圧ＯＮ／ＯＦＦ発信機構と、前記リ
リーフバルブに流入した圧油を吐出する２次側油圧回路
と、を備えて成り、前記増圧機を用いて増圧した油圧力
を規制する増圧回路の圧力規制装置において、前記増圧
ＯＮ／ＯＦＦ発信機構は、増圧ＯＮ／ＯＦＦの切換え信
号を出力するスイッチと、前記スイッチの接点を押圧し
又は前記スイッチの接点から離れて前記スイッチをＯＮ
／ＯＦＦ作動させるピストンと、前記スイッチの接点に
向かって前記ピストンを付勢する圧縮ばねと、前記リリ
ーフバルブから吐出される圧油の圧力を受けて前記ピス
トンを前記スイッチの接点から引き離すピストン押戻し
手段とを備えて成ることを特徴とするものである。In order to achieve the above object, the present invention is directed to a primary side hydraulic circuit that guides pressure oil obtained by increasing the pressure of oil sent from a hydraulic pump using a pressure booster, and the primary side hydraulic circuit. It is connected to a hydraulic circuit and is closed when the pressure in the primary side hydraulic circuit is less than a predetermined pressure to shut off the pressure oil in the primary side hydraulic circuit. In the above case, the relief valve that opens to discharge the pressure oil in the primary side hydraulic circuit and the switch that operates in conjunction with opening and closing of the relief valve are turned ON / OFF to output a pressure increase ON / OFF switching signal. Pressure increase ON / OFF transmission mechanism, and a secondary side hydraulic circuit that discharges the pressure oil that has flowed into the relief valve, and a pressure increase circuit that regulates the oil pressure increased using the pressure intensifier. In the pressure regulation device of, the pressure increase ON / OFF transmission Structure is, ON and a switch which outputs a switching signal of the pressure-increasing ON / OFF, the switch off the contacts of the switch from the pressing or contact of the switch
/ OFF-actuated piston, compression spring for urging the piston toward the contact of the switch, and piston push-back for receiving the pressure of pressure oil discharged from the relief valve to separate the piston from the contact of the switch Means and means are provided.
【００１５】また、前記スイッチは、マイクロスイッチ
であり、前記ピストン押戻し手段は、前記ピストンの径
方向へ前記ピストンの外周面から膨出した段部であるこ
ととした。Further, the switch is a micro switch, and the piston pushing-back means is a step portion bulging from the outer peripheral surface of the piston in the radial direction of the piston.
【００１６】[0016]
【作用】１次側油圧回路内の圧力が所定圧力未満のとき
は、リリーフバルブが閉じて、増圧ＯＮ／ＯＦＦ発信機
構のピストンが、スイッチの接点を圧縮バネの付勢力に
より押圧して、例えばスイッチＯＮの状態になってい
る。この状態から１次側油圧回路内の圧力が所定圧力以
上になると、リリーフバルブが開き、１次側油圧回路内
の圧油がリリーフバルブから吐出される。このリリーフ
バルブから吐出された圧油は、増圧ＯＮ／ＯＦＦ発信機
構のピストンの外周面から径方向へ膨出した段部に当た
り、ピストンにスイッチの接点から離れる方向へ圧力が
作用する。この段部に作用する圧力は、圧縮バネの付勢
力より大きいため、ピストンはスイッチの接点から離れ
てスイッチＯＦＦの状態となる。When the pressure in the primary side hydraulic circuit is less than the predetermined pressure, the relief valve is closed and the piston of the pressure increasing ON / OFF transmitting mechanism presses the contact of the switch by the urging force of the compression spring, For example, the switch is in the ON state. When the pressure in the primary side hydraulic circuit becomes equal to or higher than a predetermined pressure in this state, the relief valve opens and the pressure oil in the primary side hydraulic circuit is discharged from the relief valve. The pressure oil discharged from the relief valve hits a step portion that bulges radially from the outer peripheral surface of the piston of the pressure increase ON / OFF transmission mechanism, and pressure acts on the piston in a direction away from the contact of the switch. Since the pressure acting on this step portion is larger than the biasing force of the compression spring, the piston separates from the contact of the switch and is in the switch-off state.
【００１７】さらに、このスイッチＯＦＦの状態の下
で、１次側油圧回路内の圧油がリリーフバルブを通って
吐出されて１次側油圧回路内の圧力が所定圧力未満に低
下すると、リリーフバルブが徐々に閉じて、１次側油圧
回路内の圧油の流出が遮断される。このため、ピストン
の外周面から径方向へ膨出した段部に作用する圧力が次
第に弱まり、ピストンは圧縮バネの付勢力によりスイッ
チの接点をゆっくりと押圧してスイッチＯＮの状態とな
る。Further, when the pressure oil in the primary side hydraulic circuit is discharged through the relief valve and the pressure in the primary side hydraulic circuit falls below a predetermined pressure under this switch OFF state, the relief valve Is gradually closed, and the outflow of pressure oil in the primary hydraulic circuit is blocked. For this reason, the pressure acting on the step portion that bulges radially from the outer peripheral surface of the piston gradually weakens, and the piston slowly presses the contact of the switch by the urging force of the compression spring, and the switch is turned on.
【００１８】[0018]
【実施例】以下、本実施例を図面に基づいて説明する。
図１〜図３は本発明に係る圧力規制装置の第１の実施例
を示す。図１において、先に述べた従来例と同様な部
材、部位には、従来例との差異を明確にするため従来例
と同一の符号を付す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described below with reference to the drawings.
1 to 3 show a first embodiment of a pressure regulating device according to the present invention. In FIG. 1, the same members and parts as those of the conventional example described above are denoted by the same reference numerals as those of the conventional example in order to clarify the difference from the conventional example.
【００１９】図１において、第１の実施例に係る圧力規
制装置は、従来例と同様に、油圧ポンプ（図示せず）か
ら送出された作動油を増圧器（図示せず）を用いて増圧
した１次側油圧回路３内の圧力が、所定圧力以上になる
と開いて、１次側油圧回路３内から圧油を流出し、１次
側油圧回路３内の圧力を所定圧力未満に低下させるリリ
ーフバルブ１と、このリリーフバルブ１から流出される
圧油の圧力を受けて増圧ＯＮ／ＯＦＦの切り換え信号を
発信する増圧ＯＮ／ＯＦＦ発信機構３１とから構成され
る。In FIG. 1, the pressure regulating device according to the first embodiment increases the working oil sent from a hydraulic pump (not shown) by using a pressure booster (not shown), as in the conventional example. When the pressure in the pressurized primary side hydraulic circuit 3 becomes equal to or higher than a predetermined pressure, it opens and pressure oil flows out from the primary side hydraulic circuit 3 to reduce the pressure in the primary side hydraulic circuit 3 to less than the predetermined pressure. The relief valve 1 and the pressure increase ON / OFF transmission mechanism 31 which receives the pressure of the pressure oil flowing out from the relief valve 1 and transmits a pressure increase ON / OFF switching signal.
【００２０】リリーフバルブ１は、従来例と同一な構成
をなしている。すなわち、リリーフバルブ１は、上下方
向に小孔５ａが穿設されたバルブシート５をボディ２に
内蔵すると共に、バルブシート５の上面に、小孔５ａを
囲むように下端を当接し、上方へ延設した筒状のバルブ
本体６を備えている。The relief valve 1 has the same construction as the conventional example. That is, in the relief valve 1, the valve seat 5 having the small hole 5a formed in the up-down direction is built in the body 2, and the lower end is abutted on the upper surface of the valve seat 5 so as to surround the small hole 5a to move upward. The extended valve body 6 is provided.
【００２１】バルブ本体６の内部には、バルブ本体６の
内周面で上下方向へ摺動可能であり、小孔５ａを開閉す
るポペット弁７ａを下端に有するディスク状のバルブス
テム７と、バルブ本体６の上部内周面に上下方向へ移動
可能に螺着されたプラグ８と、バルブステム７とプラグ
８の間に挟まれてバルブステム７を所定圧力で下方へ付
勢する圧縮バネ９とを備えてある。そして、ポペット弁
７ａをバルブシート５の小孔５ａに当接し閉じると、バ
ルブシート５と、バルブステム７と、バルブ本体６の内
周面で囲まれた油室１０を形成するようにしてある。Inside the valve body 6, a disc-shaped valve stem 7 slidable in the vertical direction on the inner peripheral surface of the valve body 6 and having a poppet valve 7a at the lower end for opening and closing the small hole 5a, and a valve A plug 8 screwed to the upper inner peripheral surface of the main body 6 so as to be vertically movable, and a compression spring 9 sandwiched between the valve stem 7 and the plug 8 for urging the valve stem 7 downward with a predetermined pressure. Is equipped with. When the poppet valve 7a is brought into contact with the small hole 5a of the valve seat 5 and closed, an oil chamber 10 surrounded by the valve seat 5, the valve stem 7, and the inner peripheral surface of the valve body 6 is formed. .
【００２２】さらに、バルブ本体６の下部には、上下に
離間した上段の孔６ａと下段の孔６ｂを径方向に穿設し
てあり、ポペット弁７ａをバルブシート５の小孔５ａに
当接し閉じた状態では、下段の孔６ｂがバルブステム７
により遮断され、逆に、ポペット弁７ａがバルブシート
５の小孔５ａから離れ開いた状態では、上下段の孔６
ａ、６ｂが、共に開くようにしてある。Further, an upper hole 6a and a lower hole 6b, which are vertically separated from each other, are formed in the lower portion of the valve body 6 in the radial direction, and the poppet valve 7a is brought into contact with the small hole 5a of the valve seat 5. In the closed state, the lower hole 6b has the valve stem 7
When the poppet valve 7a is opened apart from the small hole 5a of the valve seat 5, the upper and lower holes 6a and 6b are closed.
A and 6b are opened together.
【００２３】さらに、上下段の孔６ａ、６ｂは、ボディ
２の内部に穿設した中回路１３に連通してあり、一方、
バルブシート５の下面の小孔５ａは、１次側油圧回路３
に連通してある。Further, the upper and lower holes 6a, 6b communicate with the middle circuit 13 formed inside the body 2, while
The small hole 5a on the lower surface of the valve seat 5 is provided on the primary side hydraulic circuit 3
Is in communication with.
【００２４】そして、１次側油圧回路３内の圧力が所定
圧力以上になると、１次側油圧回路３内の圧力がバルブ
シート５の小孔５ａを介してポペット弁７ａに作用し、
圧縮バネ９の付勢力に抗してバルブステム７を押し上げ
る。これにより、ポペット弁７ａが開くと共に、バルブ
本体６の上下段の孔６ａ、６ｂが開き、１次側油圧回路
３内の圧油が、バルブシート５の小孔５ａ、油室１０、
及び下段の孔６ｂを通って中回路１３に流入して中回路
１３内の圧力が所定圧力以上に上昇するようにしてあ
る。When the pressure in the primary hydraulic circuit 3 exceeds a predetermined pressure, the pressure in the primary hydraulic circuit 3 acts on the poppet valve 7a via the small hole 5a in the valve seat 5,
The valve stem 7 is pushed up against the biasing force of the compression spring 9. As a result, the poppet valve 7a is opened, the upper and lower holes 6a, 6b of the valve body 6 are opened, and the pressure oil in the primary side hydraulic circuit 3 is transferred to the small hole 5a of the valve seat 5, the oil chamber 10,
Also, the pressure in the middle circuit 13 rises above a predetermined pressure by flowing into the middle circuit 13 through the lower hole 6b.
【００２５】次に、増圧ＯＮ／ＯＦＦ発信機構３１は、
以下のように構成される。ボディ２の前側面（図１にお
いて右側面）Ｆ2 から後方へ（すなわち、中回路１３へ
向かって）所定深さのピストンホルダ収納孔３２を穿設
し、このピストンホルダ収納孔３２の後方を縮径して段
部３２ａを形成すると共に、所定深さの筒部挿通孔３３
を穿設してある。さらに、この筒部挿通孔３３の後方を
縮径して段部３３ａを形成すると共に、中回路１３に連
通してある。Next, the pressure increase ON / OFF transmission mechanism 31
It is configured as follows. A piston holder housing hole 32 having a predetermined depth is formed from the front side surface (right side surface in FIG. 1) F 2 of the body 2 rearward (that is, toward the middle circuit 13), and the rear side of the piston holder housing hole 32 is formed. The diameter is reduced to form the step portion 32a, and the cylindrical portion insertion hole 33 having a predetermined depth is formed.
Has been drilled. Further, the diameter of the rear portion of the cylindrical portion insertion hole 33 is reduced to form a step portion 33a and communicates with the middle circuit 13.
【００２６】さらに、段部３２ａの近傍のピストンホル
ダ収納孔３２には、ボディ２の外部へ導かれた２次側油
圧回路２８を接続し、また、ピストンホルダ収納孔３２
の前端部周面には、雌ねじ３２ｂを設けてある。Further, the secondary side hydraulic circuit 28 guided to the outside of the body 2 is connected to the piston holder housing hole 32 near the step portion 32a, and the piston holder housing hole 32 is provided.
A female screw 32b is provided on the peripheral surface of the front end portion of the.
【００２７】筒部挿通孔３３には、ピストンホルダ収納
孔３２を挿通したピストン３４を装着してある。このピ
ストン３４は、前方へ延設したロッド部３５と、ロッド
部３５の後方を拡径して形成したディスク部３６と、さ
らに、ディスク部３６の後方を拡径して形成したスプリ
ングホルダ部３７とを有して構成される。A piston 34, which is inserted through the piston holder housing hole 32, is attached to the cylindrical portion insertion hole 33. The piston 34 includes a rod portion 35 extending forward, a disc portion 36 formed by enlarging the rear portion of the rod portion 35, and a spring holder portion 37 formed by enlarging the rear portion of the disc portion 36. And is configured.
【００２８】さらに、スプリングホルダ部３７は、ディ
スク部３６の後端から径方向へ突設し、ピストンホルダ
収納孔３２に嵌合可能なフランジ部３７ａと、このフラ
ンジ部３７ａを縮径して後方へ所定長さ突設し、筒部挿
通孔３３に嵌合可能な筒部３７ｂとから構成され、この
筒部３７ｂの内部がスプリング室３７ｃを形成してい
る。さらに、ピストン３４には、軸心上でスプリング室
３７ｃから前方へディスク部３６の内部に達した油流出
孔３７ｄを穿設し、さらに、この油流出孔３７ｄをディ
スク部３６内部で径方向に分岐してディスク部３６を貫
通した油流出孔３７ｅを穿設してある。Further, the spring holder portion 37 is provided in a radial direction from the rear end of the disc portion 36, and has a flange portion 37a which can be fitted into the piston holder housing hole 32, and the flange portion 37a having a reduced diameter and rearward. And a cylindrical portion 37b which is protruded by a predetermined length and can fit into the cylindrical portion insertion hole 33. The inside of the cylindrical portion 37b forms a spring chamber 37c. Further, the piston 34 is provided with an oil outflow hole 37d which reaches the inside of the disk portion 36 forward from the spring chamber 37c on the axial center, and further, this oil outflow hole 37d is radially formed inside the disk portion 36. An oil outflow hole 37e is formed by branching and penetrating the disk portion 36.
【００２９】ピストンホルダ収納孔３２には、ピストン
ホルダ３８を装着してある。ピストンホルダ３８の前部
外周面には、ピストンホルダ収納孔３２の雌ねじ３２ｂ
と螺合する雄ねじ３８ａを設け、また、ピストンホルダ
３８の前部にはピストン３４のロッド部３５に、嵌合可
能なロッド挿通孔３８ｂを穿設し、さらにロッド挿通孔
３８ｂの後方を拡径してディスク部３６に嵌合可能なデ
ィスク挿通孔３８ｃを穿設すると共に、段部３８ｄを形
成してある。A piston holder 38 is mounted in the piston holder housing hole 32. On the outer peripheral surface of the front portion of the piston holder 38, the female screw 32b of the piston holder housing hole 32 is formed.
A male screw 38a that is screwed with is provided, a rod insertion hole 38b that can be fitted to the rod portion 35 of the piston 34 is formed in the front portion of the piston holder 38, and the diameter of the rear portion of the rod insertion hole 38b is expanded. Then, a disc insertion hole 38c that can be fitted into the disc portion 36 is formed, and a step portion 38d is formed.
【００３０】さらに、スプリングホルダ部３７の筒部３
７ｂの内部には、ピストン３４を前方へ弾性付勢する圧
縮バネ３９を備えてある。Further, the cylindrical portion 3 of the spring holder portion 37
A compression spring 39 that elastically biases the piston 34 forward is provided inside 7b.
【００３１】さらに、ボディ２の前側面Ｆ2 には、マイ
クロスイッチ等のようなスイッチ２７が取り付けてあ
り、圧縮バネ３９が伸長し、ピストン３４が前進した状
態では、ピストン３４の前端がマイクロスイッチ２７の
接点２７ａを押圧してスイッチＯＮの状態にしてある。Further, a switch 27 such as a micro switch is attached to the front side surface F 2 of the body 2, and when the compression spring 39 is extended and the piston 34 is advanced, the front end of the piston 34 is a micro switch. The contact 27a of the switch 27 is pressed to turn on the switch.
【００３２】そして、図２に示すように、ピストン３４
の筒部３７ｂをボディ２の筒部挿通孔３３に嵌入して、
ピストンホルダ３８の雄ねじ３８ａとピストンホルダ収
納孔３２の雌ねじ３２ｂを螺着し、ピストン３４のディ
スク部３６の前端をディスク挿通孔３８ｃの段部３８ｄ
に当接した状態（すなわち、圧縮バネ３９が伸長しピス
トン３４のロッド部３５が前進した状態）では、フラン
ジ部３７ａの前端面とピストンホルダ３８の後端に所定
の隙間Ｃ1 を生じ、この隙間Ｃ1 は油流出孔３７ｅに連
通するが、ピストンホルダ収納孔３２の周面に遮断され
て２次側油圧回路２８に連通されないようにしてある。Then, as shown in FIG.
The cylindrical portion 37b of is inserted into the cylindrical portion insertion hole 33 of the body 2,
The male screw 38a of the piston holder 38 and the female screw 32b of the piston holder housing hole 32 are screwed together, and the front end of the disc portion 36 of the piston 34 is fixed to the step portion 38d of the disc insertion hole 38c.
(That is, the compression spring 39 extends and the rod portion 35 of the piston 34 advances), a predetermined gap C 1 is created between the front end surface of the flange portion 37a and the rear end of the piston holder 38. The clearance C 1 communicates with the oil outflow hole 37e, but is blocked by the peripheral surface of the piston holder housing hole 32 so as not to communicate with the secondary hydraulic circuit 28.
【００３３】なお、図２に示すように、隙間Ｃ1 に面す
るピストン３４のフランジ部３７ａの前端面３７ｆと、
ロッド部３５の後方を拡径して形成した段部３５ａと
が、ピストン押戻し手段としての、ピストン３４の径方
向へピストン３４の外周面から膨出した段部となってい
る。また、この状態では、ロッド部３５が前進してマイ
クロスイッチ２７の接点２７ａに当接し、例えばスイッ
チ０Ｎの状態にしてある。As shown in FIG. 2, the front end surface 37f of the flange portion 37a of the piston 34 facing the clearance C 1 and
A step portion 35a formed by expanding the diameter of the rear portion of the rod portion 35 is a step portion that bulges from the outer peripheral surface of the piston 34 in the radial direction of the piston 34, which serves as piston pushing-back means. Further, in this state, the rod portion 35 moves forward to abut the contact 27a of the micro switch 27, for example, the state of the switch 0N.
【００３４】また、図３に示すように、ピストン３４の
筒部３７ｂをボディ２の筒部挿通孔３３に嵌入して、ピ
ストンホルダ３８の雄ねじ３８ａとピストンホルダ収納
孔３２の雌ねじ３２ｂを螺着し、ピストン３４の筒部３
７ｂが筒部挿通孔３３の段部３３ａに当接した状態（す
なわち、圧縮バネ３９が圧縮されピストン３４が後退し
た状態）では、ピストンホルダ３８の後端面とピストン
３４のフランジ部３７ａの前面との隙間Ｃ1 が拡大し、
この拡大した隙間Ｃ1 は、２次側油圧回路２８に連通す
るようにしてある。Further, as shown in FIG. 3, the cylinder portion 37b of the piston 34 is fitted into the cylinder portion insertion hole 33 of the body 2, and the male screw 38a of the piston holder 38 and the female screw 32b of the piston holder housing hole 32 are screwed. Then, the cylinder portion 3 of the piston 34
When 7b is in contact with the stepped portion 33a of the cylindrical portion insertion hole 33 (that is, the state where the compression spring 39 is compressed and the piston 34 is retracted), the rear end surface of the piston holder 38 and the front surface of the flange portion 37a of the piston 34 are The gap C 1 of
The enlarged clearance C 1 is communicated with the secondary hydraulic circuit 28.
【００３５】このような構成の増圧ＯＮ／ＯＦＦ発信機
構は、図２に示すように、１次側油圧回路３内の圧力が
所定圧力以上になると、上述したように、リリーフバル
ブ１が開き、１次側油圧回路３内の圧油が中回路１３を
通って増圧ＯＮ／ＯＦＦ発信機構のスプリング室３７ｃ
に流入し、さらにピストン３４内部の油流出孔３７ｄ及
び３７ｅを通って隙間Ｃ1 に流入する。また、油流出孔
３７ｄに流入した圧油は、ディスク部３６の外周面とデ
ィスク挿通孔３８ｃとの隙間を通って、ディスク挿通孔
３８ｃの段部３８ｄとディスク部３６の前端面（すなわ
ち、ロッド部３５の後方を拡径して形成した段部）３５
ａとの隙間Ｃ2 に流入する。これにより、筒部挿通孔３
３、スプリング室３７ｃ、油流出孔３７ｄ、３７ｅ、及
び隙間Ｃ 1 、Ｃ2 に所定圧力以上の圧力Ｐが作用する。Pressure-increasing ON / OFF transmitter having such a configuration
As shown in Fig. 2, the pressure in the primary side hydraulic circuit 3 is
When the pressure exceeds a certain level, as described above, the relief valve
Valve 1 opens and the pressure oil in the primary side hydraulic circuit 3 causes the middle circuit 13 to
Spring chamber 37c for increasing pressure ON / OFF transmission mechanism
To the oil outflow hole 37d inside the piston 34 and
And a gap C through 37e1Flow into. Also the oil spill hole
The pressure oil that has flowed into 37 d is discharged from the outer peripheral surface of the disk portion 36 and
Disk insertion hole through the gap with the disk insertion hole 38c
38c of the step portion 38d and the front end surface of the disc portion 36 (that is,
Then, a step portion formed by expanding the diameter of the rear portion of the rod portion 35) 35
Gap between a and C2Flow into. As a result, the cylindrical portion insertion hole 3
3, spring chamber 37c, oil outflow holes 37d, 37e, and
And gap C 1, C2A pressure P higher than a predetermined pressure acts on.
【００３６】このとき、ピストン３４の筒部３７ｂの外
径面積Ａ1 が、隙間Ｃ1 に面したフランジ部３７ａの前
端面３７ｆの面積と、隙間Ｃ2 に面したディスク部３６
の前端面３５ａの面積との合計面積Ａ2 より小さくして
あるので、ピストン３４を後退させる力Ａ2 ×Ｐが、ピ
ストン３４を前進させる力Ａ1 ×Ｐより大きくなり、ピ
ストン３４が後退して、ピストン３４の前端がマイクロ
スイッチ２７の接点２７ａから引き離され、スイッチＯ
ＦＦの状態となる。At this time, the outer diameter area A 1 of the cylindrical portion 37b of the piston 34 is such that the area of the front end surface 37f of the flange portion 37a facing the gap C 1 and the disk portion 36 facing the gap C 2
Since it is smaller than the total area A 2 of the area of the front end face 35a of the above, the force A 2 × P for retracting the piston 34 becomes larger than the force A 1 × P for advancing the piston 34, and the piston 34 retracts. The front end of the piston 34 is pulled away from the contact 27a of the micro switch 27, and the switch O
The state becomes FF.
【００３７】ただし、圧縮バネ３９の付勢力は、ピスト
ン３４の後退を妨げないように、上記のピストン３４を
後退させる力と前進させる力との差より小さくし、か
つ、リリーフバルブ１が遮断された筒部挿通孔３３、ス
プリング室３７ｃ、及び隙間Ｃ内の圧力が所定圧力未満
の状態のときには、ピストン３４を前方へ押し出しマイ
クロスイッチ２７の接点２７ａを押圧しスイッチＯＮと
することができるだけの付勢力をもたせてある。However, the urging force of the compression spring 39 is set to be smaller than the difference between the force for retracting the piston 34 and the force for advancing it so as not to hinder the retreat of the piston 34, and the relief valve 1 is shut off. When the pressures in the cylindrical portion insertion hole 33, the spring chamber 37c, and the gap C are less than the predetermined pressure, the piston 34 can be pushed forward to push the contact 27a of the micro switch 27 to turn the switch ON. It has power.
【００３８】そして、ピストン３４が後退したときに
は、図３に示すように、隙間Ｃ1 及びＣ2 が拡大されて
油流出孔３７ｅが２次側油圧回路２８に連通して、１次
側油圧回路３内の圧油がリリーフバルブ１、中回路１
３、スプリング室３７ｃ、油流出孔３７ｄ、及び３７ｅ
を通って２次側油圧回路２８に流出し、１次側油圧回路
３内の圧力が低下する。When the piston 34 retracts, as shown in FIG. 3, the gaps C 1 and C 2 are enlarged and the oil outflow hole 37e communicates with the secondary side hydraulic circuit 28 so that the primary side hydraulic circuit. Pressure oil in 3 is relief valve 1, middle circuit 1
3, spring chamber 37c, oil outflow hole 37d, and 37e
To flow to the secondary side hydraulic circuit 28, and the pressure in the primary side hydraulic circuit 3 decreases.
【００３９】１次側油圧回路３内の圧油の圧力が所定圧
力未満に低下すると、リリーフバルブ１が徐々に閉じる
と共に、スプリング室３７ｃ、油流出孔３７ｄ、３７
ｅ、及び隙間Ｃ1 、Ｃ2 の圧力が徐々に低下するため、
圧縮バネ３９の付勢力により、ピストン３４がゆっくり
と前進してマイクロスイッチ２７の接点２７ａに当接
し、スイッチＯＮの状態になる。When the pressure of the pressure oil in the primary side hydraulic circuit 3 falls below a predetermined pressure, the relief valve 1 is gradually closed and the spring chamber 37c and the oil outflow holes 37d, 37 are formed.
e and the pressures in the gaps C 1 and C 2 gradually decrease,
The urging force of the compression spring 39 causes the piston 34 to slowly move forward to come into contact with the contact 27a of the micro switch 27, and the switch is turned on.
【００４０】従って、ピストン３４がマイクロスイッチ
２７の接点２７ａに衝撃力を与えることなく接点２７ａ
に当接するため、マイクロスイッチ２７の故障を防止す
ることができる。Therefore, the contact point 27a of the micro switch 27 is not applied by the piston 34 to the contact point 27a.
Since it abuts against, the failure of the micro switch 27 can be prevented.
【００４１】図４〜図６には、本発明に係る圧力規制装
置の第２の実施例を示してある。この第２の実施例の圧
力規制装置も、リリーフバルブ１と増圧ＯＮ／ＯＦＦ発
信機構５１とを有して構成してあり、リリーフバルブ１
については、前述した従来例および第１の実施例と同一
の構成をなしているので、その構造説明は省略する。FIGS. 4 to 6 show a second embodiment of the pressure regulating device according to the present invention. The pressure regulating device of the second embodiment is also configured to have the relief valve 1 and the pressure increase ON / OFF transmission mechanism 51.
Since it has the same configuration as the above-mentioned conventional example and the first example, the description of the structure will be omitted.
【００４２】図４において、増圧ＯＮ／ＯＦＦ発信機構
５１は、以下のように構成される。ボディ２の上側面Ｆ
3 から下方へ所定深さのピストンホルダ収納孔５２を穿
設し、このピストンホルダ収納孔５２の下方を縮径して
段部５２ａを形成すると共に、ボディ２に穿設した２次
側油圧回路２８に連通してある。また、ピストンホルダ
収納孔５２の中間部を、ボディ２に穿設した中回路１３
に連通してあり、さらにピストンホルダ収納孔５２の上
端部周面には、雌ねじ５２ｂを設けてある。In FIG. 4, the pressure increase ON / OFF transmission mechanism 51 is constructed as follows. Upper side F of body 2
A piston holder housing hole 52 having a predetermined depth is drilled downward from 3, and the lower side of the piston holder housing hole 52 is reduced in diameter to form a step portion 52a, and a secondary hydraulic circuit drilled in the body 2 is formed. It communicates with 28. Further, the intermediate portion of the piston holder housing hole 52 is formed in the body 2 to form the middle circuit 13
A female screw 52b is provided on the peripheral surface of the upper end portion of the piston holder housing hole 52.
【００４３】ピストンホルダ収納孔５２には、円柱状の
ピストンホルダ５３を装着してある。このピストンホル
ダ５３の上端部外周面には、ピストンホルダ収納孔５２
の雌ねじ５２ｂと螺合する雄ねじ５３ａを設けてある。
ピストンホルダ５３の軸心上には、上端から下方へ向か
って所定深さのロッド挿通孔５４を穿設し、さらにロッ
ド挿通孔５４の下方を拡径して段部５４ａを形成すると
共に、ピストンホルダ５３の下方へ向かって開いた開口
部５５を穿設してある。また、ピストンホルダ５３の中
央部の外周面に周方向へ延びる周溝５６を設け、この周
溝５６から径方向へ延びて開口部５５に連通した油流入
孔５７を穿設してある。さらに、油流入孔５７より下方
の開口部５５の周面に、周方向へ延びる周溝５８を設け
てある。A cylindrical piston holder 53 is attached to the piston holder housing hole 52. On the outer peripheral surface of the upper end of the piston holder 53, the piston holder housing hole 52 is formed.
A male screw 53a that is screwed with the female screw 52b is provided.
On the axial center of the piston holder 53, a rod insertion hole 54 having a predetermined depth is formed downward from the upper end, and the diameter of the lower portion of the rod insertion hole 54 is expanded to form a step portion 54a. An opening 55 opened downwardly of the holder 53 is provided. Further, a peripheral groove 56 extending in the circumferential direction is provided on the outer peripheral surface of the central portion of the piston holder 53, and an oil inflow hole 57 extending in the radial direction from the peripheral groove 56 and communicating with the opening 55 is formed. Further, a circumferential groove 58 extending in the circumferential direction is provided on the circumferential surface of the opening 55 below the oil inflow hole 57.
【００４４】ロッド挿通孔５４と開口部５５には、ピス
トン５９を挿通してある。ピストン５９は、ピストンホ
ルダ５３のロッド挿通孔５４に嵌合可能な上下方向へ延
設したロッド部６０と、このロッド部６０の下方を径方
向へ膨出してピストン押戻し手段としての段部６０ａを
形成すると共に、ピストンホルダ５３の開口部５５に嵌
合可能なスプリングホルダ部６１と、開口部５５に嵌入
可能でロッド部６０の中間から径方向へ突設した断面３
角形状のストッパー６２とを有して構成される。A piston 59 is inserted through the rod insertion hole 54 and the opening 55. The piston 59 includes a rod portion 60 that extends vertically and can be fitted into the rod insertion hole 54 of the piston holder 53, and a step portion 60a as a piston pushing-back means that radially bulges below the rod portion 60. And a spring holder 61 that can be fitted into the opening 55 of the piston holder 53 and a cross-section 3 that can be fitted into the opening 55 and that projects radially from the middle of the rod 60.
And a stopper 62 having a square shape.
【００４５】ピストン５９のスプリングホルダ部６１の
軸心上には、下方へ開いた所定深さのスプリング収納室
６３を穿設すると共に、このスプリング収納室６３の上
部でスプリングホルダ部６１を径方向に貫通した油流出
孔６４を穿設してある。スプリング収納室６３には、ピ
ストン５９を上方へ付勢する圧縮バネのような拘束手段
６５を装着してある。さらにボディ２の上側面Ｆ3 に
は、マイクロスイッチ等のスイッチ２７を取り付け、マ
イクロスイッチ２７の接点２７ａがピストン５９の先端
に当接できるようにしてある。On the axial center of the spring holder 61 of the piston 59, a spring accommodating chamber 63 having a predetermined depth which is opened downward is formed, and the spring holder 61 is radially disposed above the spring accommodating chamber 63. An oil outflow hole 64 penetrating therethrough is formed. The spring accommodating chamber 63 is provided with a restraint means 65 such as a compression spring that biases the piston 59 upward. Further, a switch 27 such as a micro switch is attached to the upper side face F 3 of the body 2 so that the contact 27a of the micro switch 27 can abut the tip of the piston 59.
【００４６】そして、ピストン５９のロッド部６０をピ
ストンホルダ５３のロッド挿通孔５４に挿通すると共
に、圧縮バネ６５をスプリング収納室６３の上端とピス
トンホルダ収納孔５２の段部５２ａとの間に挟み込んだ
状態で、ピストンホルダ５３をピストンホルダ収納孔５
２に挿通し雄ねじ５３ａを雌ねじ５２ｂに螺着すると、
圧縮バネ６５の付勢力によりピストン５９が押し上げら
れて、ストッパー６２がピストンホルダ５３の開口部５
５の段部５４ａに当接し、油流入孔５７が周溝５６を介
して中回路１３に連通し、さらに開口部５５がピストン
５９の段部６０ａにより密閉されて、開口部５５から２
次側油圧回路２８への連通が遮断されるようにしてあ
る。The rod portion 60 of the piston 59 is inserted into the rod insertion hole 54 of the piston holder 53, and the compression spring 65 is sandwiched between the upper end of the spring accommodating chamber 63 and the step 52a of the piston holder accommodating hole 52. The piston holder 53 and the piston holder storage hole 5
2 and the male screw 53a is screwed into the female screw 52b,
The piston 59 is pushed up by the urging force of the compression spring 65, and the stopper 62 moves the opening 5 of the piston holder 53.
5, the oil inflow hole 57 communicates with the intermediate circuit 13 through the circumferential groove 56, and the opening 55 is sealed by the step 60a of the piston 59, so that the opening 55 to 2
Communication with the secondary hydraulic circuit 28 is cut off.
【００４７】このような構成の増圧ＯＮ／ＯＦＦ発信機
構は、図４に示すように、１次側油圧回路３内の圧力が
所定圧力以上になると、上述したように、リリーフバル
ブ１が開き、１次側油圧回路３内の圧油が中回路１３及
び増圧ＯＮ／ＯＦＦ発信機構の油流入孔５７を通って開
口部５５に流入して、開口部５５に所定圧力以上の圧力
Ｐが作用する。As shown in FIG. 4, when the pressure in the primary side hydraulic circuit 3 becomes equal to or higher than a predetermined pressure, the pressure increasing ON / OFF transmitting mechanism having such a structure opens the relief valve 1 as described above. The pressure oil in the primary-side hydraulic circuit 3 flows into the opening 55 through the intermediate circuit 13 and the oil inflow hole 57 of the pressure-increasing ON / OFF transmitting mechanism, and the pressure P above the predetermined pressure is applied to the opening 55. To work.
【００４８】このとき、開口部５５に作用した圧力は段
部６０ａの面積Ａ3 に作用し（図５（ａ），（ｂ）参
照）、ピストン５９を下降させ、ピストン５９の上端が
マイクロスイッチ２７の接点２７ａから引き離され、例
えばスイッチＯＦＦの状態となる（図６参照）。At this time, the pressure acting on the opening 55 acts on the area A 3 of the step portion 60a (see FIGS. 5A and 5B), and the piston 59 is lowered so that the upper end of the piston 59 is a microswitch. The contact 27 is separated from the contact 27a of the switch 27 so that the switch is turned off (see FIG. 6).
【００４９】ただし、圧縮バネ６５の付勢力は、ピスト
ン５９の下降を妨げないように、上記のピストン５９を
下降させる力より小さくし、かつ、リリーフバルブ１が
遮断された開口部５５内の圧力が所定圧力未満の状態の
ときには、ピストン５９を上方へ押し出しマイクロスイ
ッチ２７の接点２７ａを押圧しスイッチＯＮとすること
ができるだけの付勢力をもたせてある。However, the urging force of the compression spring 65 is made smaller than the force for lowering the piston 59 so as not to hinder the lowering of the piston 59, and the pressure in the opening 55 where the relief valve 1 is shut off. When the pressure is less than the predetermined pressure, the piston 59 is pushed upward to press the contact 27a of the micro switch 27 to turn on the switch.
【００５０】そして、ピストン５９が下降したときに
は、図６に示すように、ピストン５９の段部６０ａが下
降して、密閉状態であった開口部５５が開口部５５の周
溝５８に連通するため、１次側油圧回路３内の圧油がリ
リーフバルブ１、中回路１３、油流入孔５７、開口部５
５、開口部５５の周溝５８、油流出孔６４、スプリング
収納室６３を通ってを２次側油圧回路２８に流出し、１
次側油圧回路３内の圧力が低下する。When the piston 59 descends, as shown in FIG. 6, the stepped portion 60a of the piston 59 descends so that the opening 55 in the sealed state communicates with the circumferential groove 58 of the opening 55. The pressure oil in the primary side hydraulic circuit 3 is the relief valve 1, the intermediate circuit 13, the oil inflow hole 57, and the opening 5.
5, through the peripheral groove 58 of the opening 55, the oil outflow hole 64, and the spring accommodating chamber 63 to the secondary side hydraulic circuit 28, and
The pressure in the secondary hydraulic circuit 3 decreases.
【００５１】１次側油圧回路３内の圧油の圧力が所定圧
力未満に低下すると、リリーフバルブ１が徐々に閉じる
と共に、開口部５５圧力が徐々に低下するため、圧縮バ
ネ６５の付勢力により、ピストン５９がゆっくりと前進
してマイクロスイッチ２７の接点２７ａを押圧し、スイ
ッチＯＮの状態になる。従って、ピストン５９がマイク
ロスイッチ２７の接点２７ａに衝撃力を与えることなく
接点２７ａを押圧するため、マイクロスイッチ２７の故
障を防止することができる。When the pressure of the pressure oil in the primary side hydraulic circuit 3 drops below a predetermined pressure, the relief valve 1 gradually closes and the pressure in the opening 55 gradually drops, so that the biasing force of the compression spring 65 causes , The piston 59 slowly advances to press the contact 27a of the micro switch 27, and the switch is turned on. Therefore, the piston 59 presses the contact 27a without applying an impact force to the contact 27a of the micro switch 27, so that the failure of the micro switch 27 can be prevented.
【００５２】[0052]
【発明の効果】以上説明したように本発明によれば、１
次側油圧回路内の圧力が所定圧力以上になると、リリー
フバルブが開き、スイッチの接点を押圧しているピスト
ンをスイッチの接点から引き離して、例えばスイッチを
ＯＦＦ作動させ、そして１次側油圧回路内の圧力が所定
圧力未満に低下すると、圧縮バネの付勢力により、ピス
トンをゆっくりと押し出してスイッチの接点に押圧さ
せ、スイッチをＯＮ作動させるようにしたので、スイッ
チのＯＮ／ＯＦＦ作動の際に、スイッチの接点に衝撃力
が作用せず、スイッチの早期の故障を防止することがで
きる。As described above, according to the present invention, 1
When the pressure in the secondary hydraulic circuit becomes equal to or higher than a predetermined pressure, the relief valve opens, the piston pressing the contact of the switch is separated from the contact of the switch, for example, the switch is turned off, and the hydraulic circuit in the primary side is opened. When the pressure drops below a prescribed pressure, the piston is slowly pushed out by the biasing force of the compression spring to press it against the contact point of the switch, and the switch is turned ON. Therefore, when the switch is turned ON / OFF, Since the impact force does not act on the contact of the switch, it is possible to prevent the switch from prematurely failing.
【図１】本発明に係る圧力規制装置の第１の実施例を示
す組立断面図である。FIG. 1 is an assembled cross-sectional view showing a first embodiment of a pressure regulating device according to the present invention.
【図２】増圧ＯＮ／ＯＦＦ発信機構に圧油が流入するリ
リーフバルブの開き始めの状態を示す図１の圧力規制装
置の一部破断断面図である。FIG. 2 is a partially cutaway cross-sectional view of the pressure regulating device of FIG. 1 showing a state where a relief valve in which pressure oil flows into a pressure increase ON / OFF transmission mechanism starts to open.
【図３】リリーフバルブが開き、増圧ＯＮ／ＯＦＦ発信
機構に所定圧力以上が作用した状態を示す図１の圧力規
制装置の一部破断断面図である。FIG. 3 is a partially cutaway sectional view of the pressure regulating device of FIG. 1 showing a state in which a relief valve is opened and a predetermined pressure or more is applied to a pressure increase ON / OFF transmission mechanism.
【図４】本発明に係る圧力規制装置の第２の実施例を示
す組立断面図である。FIG. 4 is an assembled sectional view showing a second embodiment of the pressure regulating device according to the present invention.
【図５】（ａ）は増圧ＯＮ／ＯＦＦ発信機構に圧油が流
入するリリーフバルブの開き始めの状態を示す図４の圧
力規制装置の一部破断断面図である。（ｂ）はピストン
押戻し手段としての段部の面積を示すＹ−Ｙ線視図であ
る。5A is a partially cutaway cross-sectional view of the pressure regulating device of FIG. 4, showing a state where the relief valve in which pressure oil flows into the pressure increase ON / OFF transmission mechanism starts to open. (B) is a YY line view which shows the area of the step part as a piston pushing back means.
【図６】リリーフバルブが開き、増圧ＯＮ／ＯＦＦ発信
機構に所定圧力以上が作用した状態を示す図５の圧力規
制装置の一部破断断面図である。FIG. 6 is a partially cutaway cross-sectional view of the pressure regulating device of FIG. 5 showing a state in which the relief valve is opened and a predetermined pressure or more is applied to the pressure increase ON / OFF transmission mechanism.
【図７】従来の圧力規制装置の一例を示す組立断面図で
ある。FIG. 7 is an assembled sectional view showing an example of a conventional pressure regulation device.
１ リリーフバルブ ３ １次側油圧回路 ２７ スイッチ（マイクロスイッチ） ２８ ２次側油圧回路 ３１、５１ 増圧ＯＮ／ＯＦＦ発信機構 ３４、５９ ピストン ３５ａ ピストン押戻し手段（段部、ディスク部前端
面） ３７ｆ ピストン押戻し手段（フランジ部前端面） ３９、６５ 圧縮バネ ６０ａ ピストン押戻し手段（段部）1 Relief valve 3 Primary side hydraulic circuit 27 Switch (micro switch) 28 Secondary side hydraulic circuit 31, 51 Pressure increase ON / OFF transmission mechanism 34, 59 Piston 35a Piston pushing back means (step portion, disk portion front end surface) 37f Piston pushing back means (front end surface of flange) 39, 65 Compression spring 60a Piston pushing back means (step)
Claims (2)
増圧した圧油を導く１次側油圧回路と、 前記１次側油圧回路に接続され、前記１次側油圧回路内
の圧力が所定圧力未満のときは閉じて前記１次側油圧回
路内の圧油を遮断し、前記１次側油圧回路内の圧力が所
定圧力以上のときは開いて前記１次側油圧回路内の圧油
を吐出するリリーフバルブと、 前記リリーフバルブの開閉に連動してスイッチをＯＮ／
ＯＦＦ作動させ、増圧ＯＮ／ＯＦＦの切換え信号を出力
する増圧ＯＮ／ＯＦＦ発信機構と、 前記リリーフバルブに流入した圧油を吐出する２次側油
圧回路と、を備えて成り、前記増圧機を用いて増圧した
油圧力を規制する増圧回路の圧力規制装置において、 前記増圧ＯＮ／ＯＦＦ発信機構は、増圧ＯＮ／ＯＦＦの
切換え信号を出力するスイッチと、前記スイッチの接点
を押圧し又は前記スイッチの接点から離れて前記スイッ
チをＯＮ／ＯＦＦ作動させるピストンと、前記スイッチ
の接点に向かって前記ピストンを付勢する圧縮ばねと、
前記リリーフバルブから吐出される圧油の圧力を受けて
前記ピストンを前記スイッチの接点から引き離すピスト
ン押戻し手段とを備えて成ることを特徴とする圧力規制
装置。1. A primary-side hydraulic circuit that guides pressure oil obtained by increasing the pressure of oil sent from a hydraulic pump using a pressure booster, and a pressure inside the primary-side hydraulic circuit that is connected to the primary-side hydraulic circuit. Is less than a predetermined pressure, it is closed to shut off the pressure oil in the primary side hydraulic circuit, and when the pressure in the primary side hydraulic circuit is a predetermined pressure or more, it is opened to close the pressure in the primary side hydraulic circuit. Relief valve that discharges oil, and switch ON / OFF in conjunction with opening and closing of the relief valve
The booster is provided with a pressure-increasing ON / OFF transmission mechanism that is turned OFF and outputs a pressure-increasing ON / OFF switching signal, and a secondary hydraulic circuit that discharges the pressure oil that has flowed into the relief valve. In a pressure regulator of a pressure boosting circuit that regulates the hydraulic pressure boosted by using a pressure booster, the pressure boosting ON / OFF transmission mechanism pushes a switch that outputs a pressure boosting ON / OFF switching signal and a contact of the switch. Or a piston for activating the switch ON / OFF apart from the contact of the switch, and a compression spring for urging the piston toward the contact of the switch,
A pressure regulating device comprising: piston push-back means for receiving the pressure of pressure oil discharged from the relief valve and separating the piston from the contact of the switch.
り、前記ピストン押戻し手段は、前記ピストンの径方向
へ前記ピストンの外周面から膨出した段部である請求項
１記載の圧力規制装置。2. The pressure regulating device according to claim 1, wherein the switch is a micro switch, and the piston pushing-back means is a step portion that bulges from an outer peripheral surface of the piston in a radial direction of the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14965494A JP3475335B2 (en) | 1994-06-30 | 1994-06-30 | Pressure regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14965494A JP3475335B2 (en) | 1994-06-30 | 1994-06-30 | Pressure regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0814203A true JPH0814203A (en) | 1996-01-16 |
| JP3475335B2 JP3475335B2 (en) | 2003-12-08 |
Family
ID=15479949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14965494A Expired - Lifetime JP3475335B2 (en) | 1994-06-30 | 1994-06-30 | Pressure regulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3475335B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141813A (en) * | 2013-05-06 | 2014-11-12 | 北京华德液压工业集团有限责任公司 | Direct-acting overflow valve |
-
1994
- 1994-06-30 JP JP14965494A patent/JP3475335B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141813A (en) * | 2013-05-06 | 2014-11-12 | 北京华德液压工业集团有限责任公司 | Direct-acting overflow valve |
| CN104141813B (en) * | 2013-05-06 | 2017-02-15 | 北京华德液压工业集团有限责任公司 | Direct-acting overflow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3475335B2 (en) | 2003-12-08 |
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