Hydraulic drive system
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IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0162142
(1993-12-14)
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우선권정보 |
JP-0130938 (1992-05-22) |
국제출원번호 |
PCT/JP93/00677
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§371/§102 date |
19931214
(19931214)
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국제공개번호 |
WO-9324757
(1993-12-09)
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발명자
/ 주소 |
- Nozawa Yusaku (Ibaraki JPX) Ohtsu Wataru (Ibaraki JPX) Ichiki Nobuhiko (Ibaraki JPX) Ino Kazuyuki (Shimodate JPX) Matsuzaki Hiroshi (Tsukuba JPX) Takahashi Kinya (Tsuchiura JPX)
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출원인 / 주소 |
- Hitachi Construction Machinery Co., Ltd. (Tokyo JPX 03)
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인용정보 |
피인용 횟수 :
6 인용 특허 :
0 |
초록
▼
A hydraulic drive system comprises a check valve cb1 for detecting a pressure on the outlet side of a pressure compensating device VB1, a maximum load pressure detecting line SL1 for selecting higher one of the pressure detected by the check valve cb1 and a load pressure of an actuator associated wi
A hydraulic drive system comprises a check valve cb1 for detecting a pressure on the outlet side of a pressure compensating device VB1, a maximum load pressure detecting line SL1 for selecting higher one of the pressure detected by the check valve cb1 and a load pressure of an actuator associated with a hydraulic pump P1 and supplying it as a signal pressure, a check valve cb2 for detecting a pressure on the outlet side of a pressure compensating device VB2, a maximum load pressure detecting line SL2 for selecting higher one of the pressure detected by the check valve cb2 and a load pressure of an actuator associated with a hydraulic pump P2 and supplying it as a signal pressure independently of the maximum load pressure detecting line SL1, and a passage 300 for joining hydraulic fluids supplied from the hydraulic pumps P1, P2 and passing through variable restrictors RB1, RB2 with each other and supplying it to an actuator B. Mutual independence between the two hydraulic pumps P1, P2 can be thereby ensured.
대표청구항
▼
A hydraulic drive system, comprising first and second variable displacement hydraulic pumps (P1, P2), a first hydraulic actuator (B) driven by hydraulic fluids delivered from said first and second hydraulic pumps (P1, P2), a second hydraulic actuator (C) driven by the hydraulic fluid delivered from
A hydraulic drive system, comprising first and second variable displacement hydraulic pumps (P1, P2), a first hydraulic actuator (B) driven by hydraulic fluids delivered from said first and second hydraulic pumps (P1, P2), a second hydraulic actuator (C) driven by the hydraulic fluid delivered from said second hydraulic pump, first variable restrictor means (RB1) for controlling a flow rate of the hydraulic fluid supplied from said first hydraulic pump to said first hydraulic actuator, second variable restrictor means (RB2) for controlling a flow rate of the hydraulic fluid supplied from said second hydraulic pump to said first hydraulic actuator, third variable restrictor means (RC) for controlling a flow rate of the hydraulic fluid supplied from said second hydraulic pump to said second hydraulic actuator, a first pressure compensating device (VB1) for controlling a differential pressure across said first variable restrictor means, a second pressure compensating device (VB2) for controlling a differential pressure across said second variable restrictor means, a third pressure compensating device (VC) for controlling a differential pressure across said third variable restrictor means, first delivery rate control means (41a) for controlling a delivery rate of said first hydraulic pump, second delivery rate control means (41b) for controlling a delivery rate of said second hydraulic pump, and a coupling circuit (300) for joining the flow rate passing through said first variable restrictor means and the flow rate passing through said second variable restrictor means with each other and supplying the joined flow rate to said first hydraulic actuator, wherein said system further comprises: first sensor means (cb1) for detecting a pressure on an outlet side of said first pressure compensating device, second sensor means (cb2) for detecting a pressure on an outlet side of said second pressure compensating device; third sensor means (cc) for detecting a pressure on an outlet side of said third pressure compensating device; first signal pressure supply means (SL1) for supplying the pressure detected by said first sensor means, as a first signal pressure, to said first delivery rate control means; second signal pressure supply means (SL2) operated independently of said first signal pressure supply means for selecting a higher one of the pressure detected by said second sensor means and the pressure detected by said third sensor means, and supplying the selected higher pressure as a second signal pressure to said second delivery rate control means; and opening/closing means disposed in said coupling circuit and switched over from a closed position to an open position in response to a shift from a sole operation of said first variable restrictor means (RB1) to a combined operation of said first and second variable restrictor means (RB1, RB2); wherein an operating relationship between said first and second variable restrictor means (VB1, VB2) is set such that when a demanded flow rate of said first hydraulic actuator (B) is small, said first variable restrictor means is solely operated to supply only the hydraulic fluid from said first hydraulic pump (P1) to said first hydraulic actuator and when the demanded flow rate of said first hydraulic actuator is increased to exceed a predetermined value, said first and second variable restrictor means are both operated to supply both the hydraulic fluids from said first and second hydraulic pumps (P1, P2) to said first hydraulic actuator.
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