JPS61145786U - - Google Patents
Info
- Publication number
- JPS61145786U JPS61145786U JP2904085U JP2904085U JPS61145786U JP S61145786 U JPS61145786 U JP S61145786U JP 2904085 U JP2904085 U JP 2904085U JP 2904085 U JP2904085 U JP 2904085U JP S61145786 U JPS61145786 U JP S61145786U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control
- lowering
- motor
- pump
- 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 description 10
- 239000012530 fluid Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の実施例の油圧回路図、第２図
は従来装置の油圧回路図、第３図及び第４図は従
来装置のポンプ、モータ制御線図であつて、第３
図はモータ制御域がポンプ制御域より高い荷重域
で行われる場合の荷重とモータ回転数、モータ傾
転角、ポンプ傾転角、ポンプ吐出圧との関係を示
す図、第４図はモータ制御域がポンプ制御域より
低い荷重域で行われる場合の荷重とモータ回転数
、モータ傾転角、ポンプ傾転角、ポンプ吐出圧の
関係を示す図である。
１…可変容量形ポンプ、２…レギユレータ、３
…可変容量形モータ、４…制御シリンダ、７…カ
ウンタバランス弁、８…定馬力制御弁、１０…ば
ね、１８…液室、１９…ピストン、２０…遠隔制
御弁。
FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram of a conventional device, and FIGS. 3 and 4 are pump and motor control diagrams of a conventional device.
The figure shows the relationship between load, motor rotation speed, motor tilting angle, pump tilting angle, and pump discharge pressure when the motor control range is higher than the pump control range. Figure 4 shows the motor control FIG. 4 is a diagram showing the relationship between the load, motor rotation speed, motor tilt angle, pump tilt angle, and pump discharge pressure when the load range is lower than the pump control range. 1...variable displacement pump, 2...regulator, 3
...variable displacement motor, 4...control cylinder, 7...counter balance valve, 8...constant horsepower control valve, 10...spring, 18...liquid chamber, 19...piston, 20...remote control valve.
Claims (1)
るようにポンプ吐出量を制御するレギユレータを
備えた可変容量形ポンプと、制御シリンダに供給
される圧液により１回転当りの押しのけ容積が制
御される可変容量形モータと、荷重巻下げ時可変
容量形モータを制動するカウンタバランス弁と、
このカウンタバランス弁と可変容量形モータとを
つなぐ流路の液圧が、設定圧より低いと前記の押
しのけ容積を小に、設定圧を越えると押しのけ容
積を大に、設定圧と釣合うと押しのけ容積が一定
となるように前記制御シリンダを制御する定馬力
制御弁を備えると共に、かかるモータ制御を前記
ポンプ制御が行われる荷重域より軽い荷重域で行
えるようにした昇降用液圧制御装置において、定
馬力制御弁に巻下げ時巻下指令圧を導いて定馬力
制御弁を前記設定圧より高い所定圧力にセツトす
る手段を備えたことを特徴とする昇降用液圧制御
装置。 A variable displacement pump equipped with a regulator that controls the pump discharge amount so that the pump discharge amount corresponds to its own pump discharge pressure, and the displacement per revolution is controlled by the pressure fluid supplied to the control cylinder. A variable displacement motor, a counterbalance valve that brakes the variable displacement motor when lowering a load,
If the hydraulic pressure in the flow path connecting the counterbalance valve and the variable displacement motor is lower than the set pressure, the displacement volume is reduced, if it exceeds the set pressure, the displacement volume is increased, and if it is balanced with the set pressure, the displacement volume is increased. A hydraulic pressure control device for lifting, which includes a constant horsepower control valve that controls the control cylinder so that the volume is constant, and allows such motor control to be performed in a load range that is lighter than a load range in which the pump control is performed, 1. A hydraulic pressure control device for lifting and lowering, comprising means for guiding a lowering command pressure during lowering to a constant horsepower control valve to set the constant horsepower control valve at a predetermined pressure higher than the set pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2904085U JPS61145786U (en) | 1985-02-28 | 1985-02-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2904085U JPS61145786U (en) | 1985-02-28 | 1985-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61145786U true JPS61145786U (en) | 1986-09-08 |
Family
ID=30527488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2904085U Pending JPS61145786U (en) | 1985-02-28 | 1985-02-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61145786U (en) |
-
1985
- 1985-02-28 JP JP2904085U patent/JPS61145786U/ja active Pending
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