JPS55139505A - Hydraulic circuit for rotary machine - Google Patents

Hydraulic circuit for rotary machine

Info

Publication number
JPS55139505A
JPS55139505A JP4728979A JP4728979A JPS55139505A JP S55139505 A JPS55139505 A JP S55139505A JP 4728979 A JP4728979 A JP 4728979A JP 4728979 A JP4728979 A JP 4728979A JP S55139505 A JPS55139505 A JP S55139505A
Authority
JP
Japan
Prior art keywords
brake
tachometer
held
valve
hydraulic
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
JP4728979A
Other languages
Japanese (ja)
Inventor
Shuichi Ichiyama
Yasuhiko Murata
Yukio Aoyanagi
Original Assignee
Hitachi Constr Mach 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 Constr Mach Co Ltd filed Critical Hitachi Constr Mach Co Ltd
Priority to JP4728979A priority Critical patent/JPS55139505A/en
Publication of JPS55139505A publication Critical patent/JPS55139505A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To protect brake lining from abnormal wear, by providing a detector for detecting the position of a control lever for actuating directional control valves and a tachometer for detecting the revolutional speed of hydraulic motor, and controlling a brake system according to the outputs of the detector and tachometer.
CONSTITUTION: When directional control valve 4 is shifted, for instance, to its operative position a by control lever 20, limit switch 22 is turned ON and directional control valve 19 is switched to position b. Resultantly, hydraulic oil from hydraulic pressure source 17 is supplied to the rod side of hydraulic cylinder 11, so that brake 10 is released. At the same time, counterbalance valve 6 is shafted to its operative position a, so that the revolutional speed of hydraulic motor 3 is increased gradually. In this state, if control lever 20 is returned to its neutral position, control valve 19 tends to be switched to position a. However, if hydraulic motor 3 is rotated by its inertia at a speed higher than a certain level, valve 19 is held in position b by the output of tachometer 23, so that brake 10 is held in its held in its inoperative position.
COPYRIGHT: (C)1980,JPO&Japio
JP4728979A 1979-04-19 1979-04-19 Hydraulic circuit for rotary machine Pending JPS55139505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4728979A JPS55139505A (en) 1979-04-19 1979-04-19 Hydraulic circuit for rotary machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4728979A JPS55139505A (en) 1979-04-19 1979-04-19 Hydraulic circuit for rotary machine

Publications (1)

Publication Number Publication Date
JPS55139505A true JPS55139505A (en) 1980-10-31

Family

ID=12771121

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4728979A Pending JPS55139505A (en) 1979-04-19 1979-04-19 Hydraulic circuit for rotary machine

Country Status (1)

Country Link
JP (1) JPS55139505A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515065A (en) * 1982-08-30 1985-05-07 The United States Of America As Represented By The Secretary Of The Navy Automatic centering servo actuator
JPS6289288U (en) * 1985-11-25 1987-06-08
US5709083A (en) * 1996-08-15 1998-01-20 Caterpillar Inc. Hydraulic swing motor deceleration control
EP0957210A1 (en) * 1998-05-13 1999-11-17 Poclain Hydraulics Industrie Hydraulic circuit with hydraulic motor and a three-position-valve
US6050091A (en) * 1996-03-27 2000-04-18 Komatsu Ltd. Brake device for oil hydraulic motor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515065A (en) * 1982-08-30 1985-05-07 The United States Of America As Represented By The Secretary Of The Navy Automatic centering servo actuator
JPS6289288U (en) * 1985-11-25 1987-06-08
JPH045515Y2 (en) * 1985-11-25 1992-02-17
US6050091A (en) * 1996-03-27 2000-04-18 Komatsu Ltd. Brake device for oil hydraulic motor
US5709083A (en) * 1996-08-15 1998-01-20 Caterpillar Inc. Hydraulic swing motor deceleration control
EP0957210A1 (en) * 1998-05-13 1999-11-17 Poclain Hydraulics Industrie Hydraulic circuit with hydraulic motor and a three-position-valve
FR2778703A1 (en) * 1998-05-13 1999-11-19 Poclain Hydraulics Ind Hydraulic fluid circuit having a hydraulic motor and a three-position selector for selecting the fluid circulation
US6038859A (en) * 1998-05-13 2000-03-21 Poclain Hydraulics Industrie Hydraulic fluid circuit having a hydraulic motor and a three-position selector for selecting the circulation of fluid

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