JPS616028A - Control circuit for hydraulic clutch for running speed shift - Google Patents

Control circuit for hydraulic clutch for running speed shift

Info

Publication number
JPS616028A
JPS616028A JP59126870A JP12687084A JPS616028A JP S616028 A JPS616028 A JP S616028A JP 59126870 A JP59126870 A JP 59126870A JP 12687084 A JP12687084 A JP 12687084A JP S616028 A JPS616028 A JP S616028A
Authority
JP
Japan
Prior art keywords
valve
set value
pressure
secondary pressure
opens
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
JP59126870A
Other languages
Japanese (ja)
Other versions
JPH045852B2 (en
Inventor
Satoru Fukui
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP59126870A priority Critical patent/JPH045852B2/ja
Publication of JPS616028A publication Critical patent/JPS616028A/en
Publication of JPH045852B2 publication Critical patent/JPH045852B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types
    • F16D25/14—Fluid pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0209—Control by fluid pressure characterised by fluid valves having control pistons, e.g. spools

Abstract

PURPOSE:To make a loss time short, by disposing, in parallel, a valve which closes when a secondary pressure exceeds a set value, a valve which opens when the secondary pressure is below the set value and an orifice between a hydraulic pump and a speed shift hydraulic clutch. CONSTITUTION:A valve 18 which closes when a secondary pressure exceeds a set value P1, a valve 19 which opens when the secondary pressure is at a set value P2 higher than the above-mentioned set value P1 and an orifice 20 are connected in parallel together between a pump P and a speed shift hydraulic clutch C in a passage upstream of clutch operation control valves T1 through T4. Accordingly, the valve 18 opens when the secondary pressure is below the set value P1 to boost up the pressure up to the initial operating pressure of the hydraulic clutch C in a short time. Both valves 18, 19 close when the secondary pressure is between both set pressures P1, P2, and therefore the pressure is gradually raised by means of the orifice 20 to offer a smooth clutch operating characteristic. Further, when the secondary pressure exceeds the set value P2, the valve 19 opens to rapidly boost up the pressure up to the set pressure value of a valve 15 to give the normal clutch transmission condition.
JP59126870A 1984-06-20 1984-06-20 Expired - Lifetime JPH045852B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59126870A JPH045852B2 (en) 1984-06-20 1984-06-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59126870A JPH045852B2 (en) 1984-06-20 1984-06-20

Publications (2)

Publication Number Publication Date
JPS616028A true JPS616028A (en) 1986-01-11
JPH045852B2 JPH045852B2 (en) 1992-02-03

Family

ID=14945872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59126870A Expired - Lifetime JPH045852B2 (en) 1984-06-20 1984-06-20

Country Status (1)

Country Link
JP (1) JPH045852B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151574A (en) * 1986-12-16 1988-06-24 Kubota Ltd Hydraulic circuit for working vehicle
JPS63152751A (en) * 1986-12-17 1988-06-25 Kubota Ltd Hydraulically operated gear transmission

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5437061U (en) * 1977-08-18 1979-03-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5437061U (en) * 1977-08-18 1979-03-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151574A (en) * 1986-12-16 1988-06-24 Kubota Ltd Hydraulic circuit for working vehicle
JPS63152751A (en) * 1986-12-17 1988-06-25 Kubota Ltd Hydraulically operated gear transmission

Also Published As

Publication number Publication date
JPH045852B2 (en) 1992-02-03

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees