JPS566832A - Hydraulic circuit for hydraulic shovel - Google Patents

Hydraulic circuit for hydraulic shovel

Info

Publication number
JPS566832A
JPS566832A JP8134479A JP8134479A JPS566832A JP S566832 A JPS566832 A JP S566832A JP 8134479 A JP8134479 A JP 8134479A JP 8134479 A JP8134479 A JP 8134479A JP S566832 A JPS566832 A JP S566832A
Authority
JP
Japan
Prior art keywords
change
over valve
over
hydraulic
shovel
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
Application number
JP8134479A
Other languages
Japanese (ja)
Inventor
Toichi Hirata
Toshimichi Ikeda
Seiji Tamura
Kuniaki Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP8134479A priority Critical patent/JPS566832A/en
Publication of JPS566832A publication Critical patent/JPS566832A/en
Pending legal-status Critical Current

Links

Landscapes

  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To provide a positive speed-up each of the actuators as well as to improve the workability of the shovel in a hydraulic circuit for a hydraulic shovel having three units of pumps.
CONSTITUTION: Hydraulic circuit is provided with a group of change-over valves as a change-over valve 9 for a leftward movement, a change-over valve 10 for increasing a speed of the boom, a change-over valve 11 for an arm, a change-over valve 12 for a boom turning operation, another group of change-over valve 18 having a change-over valve 18a for additional turning operation and a change-over valve 18b for additional arm, pumps 2 and 3, swivel motor 40, leftward movement motor 80 and rightward movement motor 90 etc. Throttle valves E and F are arranged for said groups of change-over valves and the additional change-over valve is controlled for its change-over operation by a pressure difference between the points before and after the throttle valves E and F.
COPYRIGHT: (C)1981,JPO&Japio
JP8134479A 1979-06-29 1979-06-29 Hydraulic circuit for hydraulic shovel Pending JPS566832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8134479A JPS566832A (en) 1979-06-29 1979-06-29 Hydraulic circuit for hydraulic shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8134479A JPS566832A (en) 1979-06-29 1979-06-29 Hydraulic circuit for hydraulic shovel

Publications (1)

Publication Number Publication Date
JPS566832A true JPS566832A (en) 1981-01-24

Family

ID=13743743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8134479A Pending JPS566832A (en) 1979-06-29 1979-06-29 Hydraulic circuit for hydraulic shovel

Country Status (1)

Country Link
JP (1) JPS566832A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6189123A (en) * 1984-10-09 1986-05-07 Handoothe- Kogyo Kk Automatic speed change type hydraulic drive unit for vehicle travel unit
JPH0452603U (en) * 1990-09-13 1992-05-06
JPH0452604U (en) * 1990-09-13 1992-05-06
JPH0454303U (en) * 1990-09-13 1992-05-11

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6189123A (en) * 1984-10-09 1986-05-07 Handoothe- Kogyo Kk Automatic speed change type hydraulic drive unit for vehicle travel unit
JPH0452603U (en) * 1990-09-13 1992-05-06
JPH0452604U (en) * 1990-09-13 1992-05-06
JPH0454303U (en) * 1990-09-13 1992-05-11

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