JPS56112327A - Four-wheel drive type tractor - Google Patents

Four-wheel drive type tractor

Info

Publication number
JPS56112327A
JPS56112327A JP1339980A JP1339980A JPS56112327A JP S56112327 A JPS56112327 A JP S56112327A JP 1339980 A JP1339980 A JP 1339980A JP 1339980 A JP1339980 A JP 1339980A JP S56112327 A JPS56112327 A JP S56112327A
Authority
JP
Japan
Prior art keywords
tractor
wheel
speed
wheel drive
travel
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
JP1339980A
Other languages
Japanese (ja)
Other versions
JPS6111814B2 (en
Inventor
Osami Hashimoto
Norimi Nakamura
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 JP1339980A priority Critical patent/JPS56112327A/en
Publication of JPS56112327A publication Critical patent/JPS56112327A/en
Publication of JPS6111814B2 publication Critical patent/JPS6111814B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

PURPOSE: To automatically obtain excellent travel state by providing a device which detects the change in the travel speed of a tractor by the use of the actual speed of revolution of a wheel and properly switching the four-wheel and two-wheel drive travel states in accordance with the actual load condition.
CONSTITUTION: An operating front wheel 1 is driven by separate hydraulic motors M1, which are connected in parallel to their common variable capacity type hydraulic pump P1. On the other hand, a pair of right and left rear wheels 2 are driven by a hydraulic motor M2 which is connected to a variable capacity type hydraulic pump P2 through a deflector 9. Such a tractor provides a device 28 which detects the change in the tractor travel speed caused by an operating device 10 against the respective pumps P1 and P2 by the use of the actual speed of revolution of the output shaft 29 of a gear type speed changer 19. Besides, when the output of this detector 28 exceeds a preset value, the flow rate regulating valves 21 and 21 of a switching mechanism 20 and its direction change-over valve 23 are opened and the tractor is switched into the two-wheel drive travel state.
COPYRIGHT: (C)1981,JPO&Japio
JP1339980A 1980-02-05 1980-02-05 Four-wheel drive type tractor Granted JPS56112327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1339980A JPS56112327A (en) 1980-02-05 1980-02-05 Four-wheel drive type tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1339980A JPS56112327A (en) 1980-02-05 1980-02-05 Four-wheel drive type tractor

Publications (2)

Publication Number Publication Date
JPS56112327A true JPS56112327A (en) 1981-09-04
JPS6111814B2 JPS6111814B2 (en) 1986-04-04

Family

ID=11832032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1339980A Granted JPS56112327A (en) 1980-02-05 1980-02-05 Four-wheel drive type tractor

Country Status (1)

Country Link
JP (1) JPS56112327A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856919A (en) * 1981-09-30 1983-04-04 Fuji Heavy Ind Ltd Change-over control for four wheel drive car
JPS5861025A (en) * 1981-10-09 1983-04-11 Hitachi Ltd Microcomputer controlled 4-wheel driving car
US4396087A (en) * 1981-04-24 1983-08-02 International Harvester Co. Auxiliary drive system for combines
JPS5923467U (en) * 1982-08-05 1984-02-14 株式会社クボタ Traveling device for mobile agricultural machinery
US4528871A (en) * 1982-05-05 1985-07-16 Zahnradfabrik Freidrichshafen Ag Hydrostatic drive for vehicles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396087A (en) * 1981-04-24 1983-08-02 International Harvester Co. Auxiliary drive system for combines
JPS5856919A (en) * 1981-09-30 1983-04-04 Fuji Heavy Ind Ltd Change-over control for four wheel drive car
JPH0138687B2 (en) * 1981-09-30 1989-08-16 Fuji Heavy Ind Ltd
JPS5861025A (en) * 1981-10-09 1983-04-11 Hitachi Ltd Microcomputer controlled 4-wheel driving car
JPH0313091B2 (en) * 1981-10-09 1991-02-21 Hitachi Seisakusho Kk
US4528871A (en) * 1982-05-05 1985-07-16 Zahnradfabrik Freidrichshafen Ag Hydrostatic drive for vehicles
JPS5923467U (en) * 1982-08-05 1984-02-14 株式会社クボタ Traveling device for mobile agricultural machinery

Also Published As

Publication number Publication date
JPS6111814B2 (en) 1986-04-04

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