JPS56112327A - Four-wheel drive type tractor - Google Patents
Four-wheel drive type tractorInfo
- 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
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
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)
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 |
-
1980
- 1980-02-05 JP JP1339980A patent/JPS56112327A/en active Granted
Cited By (7)
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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