JPS57114752A - Negative brake having hydraulic closed circuit - Google Patents

Negative brake having hydraulic closed circuit

Info

Publication number
JPS57114752A
JPS57114752A JP76881A JP76881A JPS57114752A JP S57114752 A JPS57114752 A JP S57114752A JP 76881 A JP76881 A JP 76881A JP 76881 A JP76881 A JP 76881A JP S57114752 A JPS57114752 A JP S57114752A
Authority
JP
Japan
Prior art keywords
brake
brake cylinder
piston
closed circuit
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.)
Granted
Application number
JP76881A
Other languages
Japanese (ja)
Other versions
JPH0233543B2 (en
Inventor
Masami Ochiai
Takashi Kanai
Morio Oshina
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 JP76881A priority Critical patent/JPH0233543B2/en
Publication of JPS57114752A publication Critical patent/JPS57114752A/en
Publication of JPH0233543B2 publication Critical patent/JPH0233543B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Braking Systems And Boosters (AREA)

Abstract

PURPOSE: To prevent decrease of brake efficiency when exterior force is applied on loading by effecting supply and discharge of hydraulic oil to and from a negative brake cylinder by a switch valve interlocking with swash actuator of hydraulic pump.
CONSTITUTION: Switch valve 23, interlocked with swash actuator 2 of variable capacity hydraulic pump 1, connects brake cylinder 10 to a tank when piston 2a of acuator 2 is in a neutral position, and connects brake cylinder 10 to shuttle valve 22 within a hydraulic closed circuit when piston 2a is in an active position. Therefore, the brake is effected when piston 2a is in a neutral position. If exterior force is applied on load 8 to cause high pressure within piping 13 or 14, this high pressure cannot be supplied to brake cylinder 10 via shuttle valve 22, and brake effect won't be decreased.
COPYRIGHT: (C)1982,JPO&Japio
JP76881A 1981-01-08 1981-01-08 YUATSUHEIKAIRONONEGATEIBUBUREEKISOCHI Expired - Lifetime JPH0233543B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP76881A JPH0233543B2 (en) 1981-01-08 1981-01-08 YUATSUHEIKAIRONONEGATEIBUBUREEKISOCHI

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP76881A JPH0233543B2 (en) 1981-01-08 1981-01-08 YUATSUHEIKAIRONONEGATEIBUBUREEKISOCHI

Publications (2)

Publication Number Publication Date
JPS57114752A true JPS57114752A (en) 1982-07-16
JPH0233543B2 JPH0233543B2 (en) 1990-07-27

Family

ID=11482868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP76881A Expired - Lifetime JPH0233543B2 (en) 1981-01-08 1981-01-08 YUATSUHEIKAIRONONEGATEIBUBUREEKISOCHI

Country Status (1)

Country Link
JP (1) JPH0233543B2 (en)

Also Published As

Publication number Publication date
JPH0233543B2 (en) 1990-07-27

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