JPH0211206U - - Google Patents
Info
- Publication number
- JPH0211206U JPH0211206U JP8857888U JP8857888U JPH0211206U JP H0211206 U JPH0211206 U JP H0211206U JP 8857888 U JP8857888 U JP 8857888U JP 8857888 U JP8857888 U JP 8857888U JP H0211206 U JPH0211206 U JP H0211206U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic motor
- switching valve
- auxiliary
- variable displacement
- pipe
- 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
- 238000006073 displacement reaction Methods 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 1
Description
第１図は本考案の第１の実施例を示す油圧回路
図、第２図は第２の実施例を示す油圧回路図、第
３図は第３の実施例を示す油圧回路図、第４図は
従来技術を示す油圧回路図である。
１……下部走行体、２……上部旋回体、３……
エンジン、４，５，３１……油圧ポンプ、６……
タンク、７……センタジヨイント、８……油圧モ
ータ、８Ａ……容量可変部、９，４１……サーボ
アクチユエータ、１０……ブレーキ装置、１１Ａ
，１１Ｂ……主管路、１２……方向切換弁、１５
……補助切換弁、１６……シヤトル弁、１７Ａ，
１７Ｂ，３５Ａ，３５Ｂ，４２Ａ……制御管路、
１８，３６……容量制御弁、２１，３２，４２…
…副管路、２１Ａ，３２Ａ……パイロツト管路、
２２，４３……切換弁、２３，３３，４４……減
圧弁、３４……圧力制御弁。
Fig. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention, Fig. 2 is a hydraulic circuit diagram showing a second embodiment, Fig. 3 is a hydraulic circuit diagram showing a third embodiment, and Fig. 4 is a hydraulic circuit diagram showing a third embodiment. The figure is a hydraulic circuit diagram showing a conventional technique. 1... Lower traveling body, 2... Upper revolving body, 3...
Engine, 4, 5, 31...Hydraulic pump, 6...
Tank, 7... Center joint, 8... Hydraulic motor, 8A... Variable capacity section, 9, 41... Servo actuator, 10... Brake device, 11A
, 11B... Main pipeline, 12... Directional switching valve, 15
...Auxiliary switching valve, 16...Shuttle valve, 17A,
17B, 35A, 35B, 42A...control pipe,
18, 36... Capacity control valve, 21, 32, 42...
...Auxiliary pipe line, 21A, 32A...Pilot pipe line,
22, 43...Switching valve, 23, 33, 44...Pressure reducing valve, 34...Pressure control valve.
Claims (1)
、該油圧モータの容量可変部を駆動するサーボア
クチユエータと、前記油圧モータの回転停止時に
該油圧モータに制動を与えるブレーキ装置と、前
記油圧モータと主油圧源との間を接続した主管路
と、該主管路の途中に設けられ、前記油圧モータ
を正逆回転させる方向切換弁と、該方向切換弁と
油圧モータとの間に位置して前記主管路の途中に
設けられた回転自在なセンタジヨイントと、該セ
ンタジヨイントを介して前記ブレーキ装置と副油
圧源との間を接続した副管路と、該副管路の途中
に設けられ、前記方向切換弁に連通する補助切換
弁とからなる可変容量型油圧モータの駆動回路に
おいて、前記副管路の途中には副油圧源と補助切
換弁との間に位置して圧力切換装置を設け、該圧
力切換装置から出力される制御圧により前記サー
ボアクチユエータを大容量側と小容量側とに切換
制御する構成としたことを特徴とする可変容量型
油圧モータの駆動回路。 a variable displacement hydraulic motor having a variable displacement section; a servo actuator for driving the variable displacement section of the hydraulic motor; a brake device that applies braking to the hydraulic motor when the hydraulic motor stops rotating; and a main hydraulic power source, a directional switching valve provided in the middle of the main pipeline for rotating the hydraulic motor in forward and reverse directions, and a directional switching valve located between the directional switching valve and the hydraulic motor. A rotatable center joint provided in the middle of the main pipe, a sub-pipe connecting the brake device and the auxiliary hydraulic power source via the center joint, and a sub-pipe provided in the middle of the sub-pipe. In a variable displacement hydraulic motor drive circuit comprising an auxiliary switching valve communicating with the directional switching valve, a pressure switching device is located in the middle of the auxiliary pipe line between the auxiliary hydraulic pressure source and the auxiliary switching valve. A drive circuit for a variable displacement hydraulic motor, characterized in that the servo actuator is controlled to be switched between a large capacity side and a small capacity side using a control pressure output from the pressure switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8857888U JPH0211206U (en) | 1988-07-04 | 1988-07-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8857888U JPH0211206U (en) | 1988-07-04 | 1988-07-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0211206U true JPH0211206U (en) | 1990-01-24 |
Family
ID=31313137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8857888U Pending JPH0211206U (en) | 1988-07-04 | 1988-07-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0211206U (en) |
-
1988
- 1988-07-04 JP JP8857888U patent/JPH0211206U/ja active Pending