JPS6011773A - Control unit of hydraulic close circuit - Google Patents
Control unit of hydraulic close circuitInfo
- Publication number
- JPS6011773A JPS6011773A JP11692083A JP11692083A JPS6011773A JP S6011773 A JPS6011773 A JP S6011773A JP 11692083 A JP11692083 A JP 11692083A JP 11692083 A JP11692083 A JP 11692083A JP S6011773 A JPS6011773 A JP S6011773A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- main circuit
- circuit
- pump
- holding pressure
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は可変ポンプとモータとを閉回路接続してなる油
圧閉回路の制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic closed circuit control device in which a variable pump and a motor are connected in a closed circuit.
従来の油圧閉回路としては、例えば第１図に示すように
、可変ポンプＰとモータＭと金弟１、第２主回路１，２
で閉回路−接続し、可変ポンプＰの吐出量変更部材（つ
まシ、斜板）ｐ、ｅサーボピストン３に連結し、このサ
ーボピストン３に制御ポンプ４の吐出圧油をパイロット
弁５で供給して吐出量を制御するように１したものが知
られている。For example, as shown in FIG. 1, a conventional hydraulic closed circuit includes a variable pump P, a motor M, a metal tube 1, and a second main circuit 1, 2.
A closed circuit is connected to the variable pump P, and the discharge amount changing members (picks, swash plate) P and E are connected to the servo piston 3, and the discharge pressure oil of the control pump 4 is supplied to the servo piston 3 by the pilot valve 5. It is known that the discharge amount is controlled by 1 in order to control the discharge amount.
この様な油圧閉回路のモータＡｆ ｆパワーショベルの
旋回体の旋回として利用した場合に、パワーショベルが
傾斜地で稼動している際に旋回体の、自然降下を防止す
るために、モータＭの回転を確実に停止させる機械式ブ
レーキ６を設置している。When such a hydraulic closed circuit motor Af f is used for turning the revolving body of a power excavator, the rotation of motor M must be A mechanical brake 6 is installed to ensure a reliable stop.
この機械式ブレーキ６はバネ力で常時制動状態に保持さ
れ、パイロット弁５の第１．纂２回路５．，５２の圧力
フ＞ ｔＪ、、 ｐ ｉＲの差圧△Ｌが一定値以上にな
ると非制動状態となるようにしである。This mechanical brake 6 is always maintained in a braking state by a spring force, and the first brake of the pilot valve 5 is held in a braking state at all times by a spring force. 2 circuits 5. , 52 pressure f > tJ, , piR When the differential pressure ΔL of iR exceeds a certain value, a non-braking state is established.
つまり１機械式ブレーキ６の受圧室６σをバイ四ット式
の切換弁７を介して制″御ポンプ４の吐出路４αに接続
し、切換弁７ｆ：常時ドレーン位置Ｎ（受圧室６αをド
レーンに接続する位置）とし、そのｍｌ、第２パイロツ
ト圧受部７． 、７２を前記第１、第２回路５１＊５！
に接続し、前記差圧ΔＬが生じると第１又は第２連通位
置Ｉ、［（受圧室６αを吐出路４αに接続する位置）に
切換るように構成しである。In other words, the pressure receiving chamber 6σ of the mechanical brake 6 is connected to the discharge passage 4α of the control pump 4 via the bi-quad type switching valve 7, and the switching valve 7f is in the constant drain position N (the pressure receiving chamber 6α is ), and the second pilot pressure receiving portions 7., 72 are connected to the first and second circuits 51*5!
and is configured to switch to the first or second communication position I (a position connecting the pressure receiving chamber 6α to the discharge path 4α) when the pressure difference ΔL occurs.
この様に構成すると、パイロット弁５の操作レバ５αを
矢印イ方向に操作して第１回路５１に圧油を吐出すると
その圧力ＰｉＬが大となυサーボピストン３が矢印口方
向に移動して可変ポンプＰが第１主回路１に圧油を吐出
する。With this configuration, when the operating lever 5α of the pilot valve 5 is operated in the direction of arrow A to discharge pressure oil into the first circuit 51, the pressure PiL becomes large and the υ servo piston 3 moves in the direction of the arrow. A variable pump P discharges pressure oil to the first main circuit 1.
この時、ＰｔＬ −ＰｉＲが△Ｌｙｅ越えると切換弁７
が第１連通位置■に切換シ、制御ポンプ４の吐出油が機
械式ブレーキ６の受圧室６αに供給されて非制動状態と
なってモータＭは回転する。At this time, if PtL - PiR exceeds △Lye, the switching valve 7
is switched to the first communication position (3), the oil discharged from the control pump 4 is supplied to the pressure receiving chamber 6α of the mechanical brake 6, and the motor M rotates in a non-braking state.
この様に構成すれば、傾斜地で旋回体を上げる場合（つ
まり、負荷を持ち上げる方向に動かす場合）に、機械式
ブレーキ６を解除したとき第１主回路１に保持圧がかか
る時には、機械式ブレーキ６の解除に先立って可変ポン
プＰは第１主回路１に圧油を吐出しているので、第１主
回路１には圧油が満たされて機械式ブレーキ６全解除さ
れる時には第１主回路Ｉは保持圧近く壕で圧力上昇して
いるから、機械式ブレーキ６を解除すればモータＭはス
ムーズに回転することができる。With this configuration, when raising the rotating body on a slope (that is, when moving in the direction of lifting a load), when the mechanical brake 6 is released and holding pressure is applied to the first main circuit 1, the mechanical brake Since the variable pump P discharges pressure oil to the first main circuit 1 before the mechanical brake 6 is released, the first main circuit 1 is filled with pressure oil, and when the mechanical brake 6 is completely released, the first main circuit 1 is filled with pressure oil. Since the pressure in the circuit I is rising near the holding pressure, the motor M can rotate smoothly if the mechanical brake 6 is released.
すなわち、負荷持上げ時に可変ポンプ吐出側の主回路に
保持圧がかかる場合にはスムーズに荷を下げる方向に動
かす場合）に、機械式ブレーキ６を解除したとき第２主
回路２に保持圧がかかる時には、機械式ブレーキ６の解
除に先立って可変ポンプＰは第１主回路１に圧油を吐出
しているから、この状態で機械式ブレーキ６を解除する
とモータＭは負荷（旋回体）の自重と第１主回路１の圧
力によって急激に回転する。In other words, if holding pressure is applied to the main circuit on the discharge side of the variable pump when lifting a load, holding pressure is applied to the second main circuit 2 when the mechanical brake 6 is released. Sometimes, the variable pump P discharges pressure oil to the first main circuit 1 before the mechanical brake 6 is released, so if the mechanical brake 6 is released in this state, the motor M will absorb the weight of the load (rotating body). It rotates rapidly due to the pressure of the first main circuit 1.
この回転し始めたモータＭは第２主回路２の圧力が保持
圧となるまで自由落下し、第２主回路２の圧力が保持圧
と一致した時に初めてコントロール可能な状態となる。The motor M that has started rotating falls freely until the pressure in the second main circuit 2 reaches the holding pressure, and only when the pressure in the second main circuit 2 matches the holding pressure does it become controllable.
したがって、この自由落下の間はモータＭはコントロー
ル不能であり、また負荷が重い場合には急激なショック
を発生してしまう。Therefore, during this free fall, the motor M is uncontrollable, and if the load is heavy, a sudden shock will occur.
すなわち、負荷下げ時には可変ポンプ吸込側に保持圧が
かかり、可変ポンプ吸込側の流量全コントロールしてモ
ータの回転を制御するのであるが、機械式ブレーキの解
除の前後で圧力のかかる回路が入れ替るため、この際に
ショックを生じる。In other words, when the load is reduced, holding pressure is applied to the variable pump suction side, and the motor rotation is controlled by controlling the entire flow rate of the variable pump suction side, but the circuit that applies pressure is switched before and after the mechanical brake is released. Therefore, a shock occurs at this time.
以上要約すると、従来の制御装置であると可変ポンプの
吐出側の主回路と反対側の主回路に負荷保持圧が作用す
る場合には、その反対側の主回路が保持圧に達するまで
の間には可変ポンプがモータ、モータがポンプ作用を行
なうことになるので、ショックが発生してしまうとの不
具合を有する。In summary, with conventional control devices, when load holding pressure acts on the main circuit on the opposite side of the discharge side of a variable pump, the period until the main circuit on the opposite side reaches the holding pressure is Since the variable pump is the motor and the motor performs the pumping action, there is a problem that a shock may occur.
本発明は上記の事情に鑑みなされたものであり、その目
的は、どちらか一方の主回路に発生した保持圧によって
ポンプが自由落下することを防止できるようにした油圧
閉回路の制御装置を提供することである。The present invention has been made in view of the above circumstances, and its purpose is to provide a hydraulic closed circuit control device that can prevent the pump from falling freely due to the holding pressure generated in one of the main circuits. It is to be.
以下第２図以降を参照して本発明の詳細な説明する。な
お、従来と同一部材は符号を同一とする。The present invention will be described in detail below with reference to FIG. 2 and subsequent figures. Note that members that are the same as those in the prior art have the same reference numerals.
斜板Ｐ１とサーボシリンダ３との間には零点シフトシリ
ンダ１０が設けてあｐ、該零点シフトシリンダ１０はシ
リンダチューブＩＩ内にピストン＋２ｔ−備えたロッド
１３全嵌挿して第１、第２室１０．．１０．全形成し、
一対のバネ１４．１４で中立位置に保持しかつ第１、第
２室１０．、ｔｏ。A zero point shift cylinder 10 is provided between the swash plate P1 and the servo cylinder 3, and the zero point shift cylinder 10 is fully inserted into the cylinder tube II with a rod 13 provided with a piston +2t-, and is connected to the first and second chambers. 10. ．． 10. Fully formed,
The first and second chambers 10. are held in a neutral position by a pair of springs 14.14. , to.
金弟１、第２主回路１．２に接続した構造となっている
。It has a structure in which it is connected to the main circuit 1 and the second main circuit 1 and 2.
しかして、機械式ブレーキ６を解除した時に保持圧がか
からない場合（例えば平地で旋回体を旋回させる場合）
には、第１、第２室１０．。However, when the holding pressure is not applied when the mechanical brake 6 is released (for example, when turning the rotating structure on flat ground)
The first and second chambers are 10. .
１０、内の圧力が鈎シ合っているから斜板ＰＩが正規の
零点となり、通常のように制御される。10, since the pressures within are matched, the swash plate PI becomes the normal zero point and is controlled as usual.
また、機械式ブレーキ６を解除した時に第１主回路１に
保持圧がかかる場合（例えば傾斜地で旋回体を上げる時
）には、機械式ブレーキ６が解除すると第１主回路１に
保持圧ががかシ、第１室１０Ｉ内の圧力が大となるから
ロッド１３は矢印ハ方向に移動して斜板Ｐ１が矢印二方
向に傾転して可変ポンプＰは所定の吐出量よりも少ない
微少な量の消音吐出する。In addition, if holding pressure is applied to the first main circuit 1 when the mechanical brake 6 is released (for example, when raising the rotating structure on a slope), the holding pressure is applied to the first main circuit 1 when the mechanical brake 6 is released. However, since the pressure in the first chamber 10I increases, the rod 13 moves in the direction of the arrow C, the swash plate P1 tilts in the two directions of the arrow, and the variable pump P pumps a small amount less than the predetermined discharge amount. Discharges a sufficient amount of noise.
これにより、第１主回路１の圧力を増大させてモータＡ
ｆの自由落下を防止する。この後にモータＭは正常回転
される。As a result, the pressure in the first main circuit 1 is increased and the motor A
Prevent free fall of f. After this, the motor M is rotated normally.
また、機械式ブレーキ６が解除した時に第２主回路に保
持圧がかかる場合（例えば傾斜地で旋回体を下げる時）
には、機械式ブレーキ６が解除すると第２主回路２の圧
力が上昇して第２室１０２内の圧力が上昇し、ロッド１
３は矢印巾方向に移動して斜板Ｐ１ヲ反矢印二方向に傾
転して第２主回路２側に圧油を吐出して第２主回路２の
圧力全上昇しモータＭの自由落下全阻止する。Also, when holding pressure is applied to the second main circuit when the mechanical brake 6 is released (for example, when lowering the rotating structure on a slope)
When the mechanical brake 6 is released, the pressure in the second main circuit 2 increases, the pressure in the second chamber 102 increases, and the rod 1
3 moves in the width direction of the arrow, tilts the swash plate P1 in the opposite direction of the arrow, discharges pressure oil to the second main circuit 2 side, the pressure of the second main circuit 2 rises completely, and the motor M falls freely. completely prevent it.
そして、第２主回路２内の圧力が保持圧となると斜板Ｐ
１が矢印二方向に傾転じて可変ポンプＰは第１主回路側
に圧油を吐出して正常の旋回動作を行なう。When the pressure in the second main circuit 2 reaches the holding pressure, the swash plate P
1 is tilted in the two directions of the arrow, and the variable pump P discharges pressure oil to the first main circuit side and performs a normal turning operation.
第３図は他の実施例を示し、パイロット弁５よシの第１
、第２回路５８，５□をサーボ装置Ａに接続し、サーボ
装置Ａで斜板Ｐ１’に作動するようにしてあり、該サー
ボ装置は第４図に示すように構成しである。つまり、サ
ーボピストン３はリンク２０で斜板Ｐ１に連結されかつ
一対のバネ２１．２１で中立位置に保持されていると共
に、レバ２２の一端が連結され、とのレバ２２の中間部
は第１スプール２３にピン２４で枢着され、かつ他端は
第２スプール２５に連結してあり、この第２スプール２
５はスリーブ２６に嵌挿されていると共に、制御ポンプ
４の吐出路４ａに接続した入口ボート２７と第１、第２
出ロポー）２８．２９ｔ−断連する括れ部３０を有し、
第１スプール２３は一対のバネ３１．３１で中立位置に
保持され、かつ第１、第２バネ室３２゜３３は前記第１
、第２回路５．〜５．に接続しであると共に、第１、第
２出ロボー）２８．２９はサーボピストン３の第１、第
２バネ室３４．３５に接続してあシ、さらにスリーブ２
６は一対のバネ３６．３６で中立位置に保持され、かつ
第１、第２バネ室３７．３８に第２、第１主回路２．１
に接続しであると共に、第２スプール２５はバネ３９で
中立位置に保持しである。FIG. 3 shows another embodiment, in which the first valve of the pilot valve 5
, the second circuits 58, 5□ are connected to the servo device A so that the servo device A operates on the swash plate P1', and the servo device is constructed as shown in FIG. That is, the servo piston 3 is connected to the swash plate P1 by a link 20 and held in a neutral position by a pair of springs 21.21, and one end of a lever 22 is connected to the swash plate P1. It is pivotally connected to the spool 23 by a pin 24, and the other end is connected to a second spool 25.
5 is fitted into the sleeve 26 and connected to the inlet boat 27 connected to the discharge path 4a of the control pump 4, and the first and second
28.29t - has a constricted part 30 that is disconnected,
The first spool 23 is held in a neutral position by a pair of springs 31 and 31, and the first and second spring chambers 32 and 33 are
, second circuit 5. ~5. In addition, the first and second output robots 28 and 29 are connected to the first and second spring chambers 34 and 35 of the servo piston 3, and the sleeve 2
6 is held in a neutral position by a pair of springs 36.36, and the second and first main circuits 2.1 are connected to the first and second spring chambers 37.38.
The second spool 25 is held in a neutral position by a spring 39.
この様でおるから、パイロット弁３を操作しない時には
サーボピストン３、第１、第２スプール２３．２５、ス
プール２６は中立位置に保持されて斜板Ｐ、は中立位置
（吐出量Ｏ位置）に保持される。Because of this, when the pilot valve 3 is not operated, the servo piston 3, the first and second spools 23, 25, and the spool 26 are held in the neutral position, and the swash plate P is in the neutral position (discharge amount O position). Retained.
そして、パイロット弁３？操作して第１回路５、に圧油
を供給すると第１スプール２３が右方に押動されてレバ
２２にサーボピストン３を中心として右方に揺動じ、第
２スプール２５を右方に摺動してムロボート２７全第１
出口ポート２８に連通し、制御ポンプ４の吐出圧油が第
１バネ室３４に供給されサーボピストン３を右方に押動
し斜板Ｐ＋に右方に傾転して第１回路１に圧油を吐出す
る。And pilot valve 3? When operated to supply pressure oil to the first circuit 5, the first spool 23 is pushed to the right, causing the lever 22 to swing to the right around the servo piston 3, and sliding the second spool 25 to the right. Move Muro Boat 27 all 1st
It communicates with the outlet port 28, and the discharge pressure oil of the control pump 4 is supplied to the first spring chamber 34, pushes the servo piston 3 to the right, causes the swash plate P+ to tilt to the right, and applies pressure to the first circuit 1. Discharge oil.
サーボピストン３が右方に押動されるとレノ９２２はビ
ン２４を中心として左方に揺動されて第２スプール２５
を左方に移動して入口ボート２７と第１出ロボート２８
とを遮断してサーボピストン３はその位置に保持される
。When the servo piston 3 is pushed to the right, the reno 922 is swung to the left about the bin 24 and is moved to the second spool 25.
Move to the left and enter the entrance boat 27 and the first exit boat 28.
The servo piston 3 is held at that position.
つまり、レバ２２によりサーボピストン３の移動が第２
スプール２５にフィードバックされて、第２スプール２
５が移動した値と相当する、だけサーボピストン３を移
動する。In other words, the lever 22 causes the servo piston 3 to move in the second
is fed back to the spool 25 and the second spool 2
The servo piston 3 is moved by an amount corresponding to the value moved by 5.
以上の動作において、第１主回路１に保持圧がかかると
、その保持圧は第２バネ室３８に保持されてスリーブ２
６を左方に押動して入口ボート２７と第１出ロボート２
８との連通面積を増大して第１バネ室３４への圧油供給
全増大するからサーボピストン３の移動ストロークが長
くなって可変ポンプＰの吐出量は増大し、第１主回路１
内全すみやかに保持圧に上昇する。In the above operation, when holding pressure is applied to the first main circuit 1, the holding pressure is held in the second spring chamber 38 and the sleeve 2
6 to the left to connect the entrance boat 27 and the first exit boat 2.
8 and the total pressure oil supply to the first spring chamber 34 increases, the movement stroke of the servo piston 3 becomes longer, the discharge amount of the variable pump P increases, and the first main circuit 1
The internal pressure quickly rises to the holding pressure.
また、第２主回路２に保持圧がかかると、その保持圧は
第１バネ室３７に供給されてスリーブ２６を右方に押動
して入口ボート２７と第２出ロポート２９とを連通し、
第２バネ室３５に制御ポンプ４の吐出圧油全供給してザ
ーボピストン３全左方に押動し、斜板Ｒｋ反対向に傾転
させて可変ポンプＰより第２主回路２に圧油全吐出する
。これにより、第２主回路２内の圧力全保持圧にすみや
かに上昇する。Further, when a holding pressure is applied to the second main circuit 2, the holding pressure is supplied to the first spring chamber 37 and pushes the sleeve 26 to the right to connect the inlet boat 27 and the second outlet port 29. ,
Fully supply the discharge pressure oil of the control pump 4 to the second spring chamber 35, push the servo piston 3 all the way to the left, tilt the swash plate Rk in the opposite direction, and supply all the pressure oil to the second main circuit 2 from the variable pump P. Exhale. As a result, the pressure within the second main circuit 2 quickly rises to the full holding pressure.
本発明は以上の様に々す、どちらか一方の主回路に発生
した保持圧によってポンプが自由落下することを防止で
きる。As described above, the present invention can prevent the pump from falling freely due to the holding pressure generated in one of the main circuits.
第１図は従来例の回路図、第２図は本発明の実施例を示
す回路図、第３図は第２実施例の回路図、第４図はその
サーボ装置の詳細断面図である。
Ｐは可変ポンプ、Ｍはモータ、１，２は第１、第２主回
路。
出願人 株式会社 小松製作所
代理人弁理士米原正章
弁理士浜本 忠FIG. 1 is a circuit diagram of a conventional example, FIG. 2 is a circuit diagram showing an embodiment of the present invention, FIG. 3 is a circuit diagram of a second embodiment, and FIG. 4 is a detailed sectional view of the servo device. P is a variable pump, M is a motor, and 1 and 2 are first and second main circuits. Applicant Komatsu Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto
Claims (1)
閉回路接続した油圧閉回路において、前記第１、ｇ２主
回路１，２のどちらか一方の主回路に発生した保持圧を
検知する手段と、この検知手段によって検知した保持圧
によって可変ポンプＰの吐出量変更部材Ｐ、ヲ、保持圧
が発生した側の主回路に圧油を吐出する状態に切換える
手段金膜けたこと全特徴とする油圧閉回路の制御装置。In a hydraulic closed circuit in which the variable pump P and the motor M are connected in a closed circuit through the first and second main circuits 1.2, the holding pressure generated in one of the first and g2 main circuits 1 and 2. and a means for switching the discharge amount changing member P of the variable pump P according to the holding pressure detected by the detection means to a state in which pressurized oil is discharged to the main circuit on the side where the holding pressure is generated. Hydraulic closed circuit control device with all features.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11692083A JPS6011773A (en) | 1983-06-30 | 1983-06-30 | Control unit of hydraulic close circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11692083A JPS6011773A (en) | 1983-06-30 | 1983-06-30 | Control unit of hydraulic close circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6011773A true JPS6011773A (en) | 1985-01-22 |
Family
ID=14698935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11692083A Pending JPS6011773A (en) | 1983-06-30 | 1983-06-30 | Control unit of hydraulic close circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6011773A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001099265A (en) * | 1999-10-01 | 2001-04-10 | Yanmar Diesel Engine Co Ltd | Hydraulic type continuously variable transmission |
| JP2009243435A (en) * | 2008-03-31 | 2009-10-22 | Kayaba Ind Co Ltd | Servo regulator |
| JP2011522177A (en) * | 2008-06-02 | 2011-07-28 | ツェットエフ フリードリヒスハーフェン アクチエンゲゼルシャフト | Hydraulic module having two oblique axis drive mechanisms incorporated in the hydraulic module |
| JP2014066331A (en) * | 2012-09-27 | 2014-04-17 | Daihatsu Motor Co Ltd | Hydraulic continuously variable transmission |
| WO2018168882A1 (en) * | 2017-03-13 | 2018-09-20 | Ｋｙｂ株式会社 | Servo regulator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5781536A (en) * | 1980-11-07 | 1982-05-21 | Hitachi Constr Mach Co Ltd | Turnable oil-pressure closed circuit for construction machinery |
-
1983
- 1983-06-30 JP JP11692083A patent/JPS6011773A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5781536A (en) * | 1980-11-07 | 1982-05-21 | Hitachi Constr Mach Co Ltd | Turnable oil-pressure closed circuit for construction machinery |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001099265A (en) * | 1999-10-01 | 2001-04-10 | Yanmar Diesel Engine Co Ltd | Hydraulic type continuously variable transmission |
| JP2009243435A (en) * | 2008-03-31 | 2009-10-22 | Kayaba Ind Co Ltd | Servo regulator |
| JP2011522177A (en) * | 2008-06-02 | 2011-07-28 | ツェットエフ フリードリヒスハーフェン アクチエンゲゼルシャフト | Hydraulic module having two oblique axis drive mechanisms incorporated in the hydraulic module |
| JP2014066331A (en) * | 2012-09-27 | 2014-04-17 | Daihatsu Motor Co Ltd | Hydraulic continuously variable transmission |
| WO2018168882A1 (en) * | 2017-03-13 | 2018-09-20 | Ｋｙｂ株式会社 | Servo regulator |
| JP2018150870A (en) * | 2017-03-13 | 2018-09-27 | Ｋｙｂ株式会社 | Servo regulator |
| CN110325734A (en) * | 2017-03-13 | 2019-10-11 | Ｋｙｂ株式会社 | Servo-operated regulator |
| CN110325734B (en) * | 2017-03-13 | 2020-11-24 | Ｋｙｂ株式会社 | Servo regulator |
| DE112018001305B4 (en) | 2017-03-13 | 2023-02-16 | Kyb Corporation | Servo regulator with feedback section for a variable volume piston pump |
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