JPS5757946A - Traveling speed control unit to farm tractor - Google Patents
Traveling speed control unit to farm tractorInfo
- Publication number
- JPS5757946A JPS5757946A JP12807781A JP12807781A JPS5757946A JP S5757946 A JPS5757946 A JP S5757946A JP 12807781 A JP12807781 A JP 12807781A JP 12807781 A JP12807781 A JP 12807781A JP S5757946 A JPS5757946 A JP S5757946A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- traveling speed
- hydraulic pressure
- works
- speed control
- 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
- Gear-Shifting Mechanisms (AREA)
- Control Of Transmission Device (AREA)
Abstract
PURPOSE: To positively insure the cultivation, insemination and fertilization works of a farm tractor by optionally selecting an automatic control valve of a speed control unit to either an off-functional or an auto-functional position.
CONSTITUTION: While an automatic control valve 43 is functioning, a workload increase is detected by a pressure regulator valve 49, that is a load detector, and the valve 43 is shifted toward a low speed position, so that it may control feed/discharge switching of hydraulic oil to plural hydraulic pressure clutches 32, 33 and 34 for forward speed shifting, and the traveling speed is placed under control. Thus various farm works are insured under the constant condition. While the feed/discharge of the hydraulic oil to the hydraulic pressure clutches 32W35 is switched manually, the valve 43 is set to an off-functioning position and on/off switching of the hydraulic pressure clutches 32W35 is controlled by a manually operated switching valve 41. Therefore the traveling speed control of a tractor is manually practicable and an operator can appropriately carry out various farm works such as insemination, fertilization, etc.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12807781A JPS5757946A (en) | 1981-08-14 | 1981-08-14 | Traveling speed control unit to farm tractor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12807781A JPS5757946A (en) | 1981-08-14 | 1981-08-14 | Traveling speed control unit to farm tractor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52078420A Division JPS5821132B2 (en) | 1977-06-29 | 1977-06-29 | Traveling speed control device for agricultural tractors, etc. |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5757946A true JPS5757946A (en) | 1982-04-07 |
JPS628656B2 JPS628656B2 (en) | 1987-02-24 |
Family
ID=14975854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12807781A Granted JPS5757946A (en) | 1981-08-14 | 1981-08-14 | Traveling speed control unit to farm tractor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5757946A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0475918A2 (en) * | 1990-09-14 | 1992-03-18 | PRODEA S.r.l. | An electronic control system for a hydrokinetic power-shift transmission for a motor vehicle |
JPH04107565U (en) * | 1991-03-04 | 1992-09-17 | セイレイ工業株式会社 | tractor gearbox |
JPH07132754A (en) * | 1993-11-09 | 1995-05-23 | Yanmar Agricult Equip Co Ltd | Load control mechanism for tractor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01117096U (en) * | 1988-01-29 | 1989-08-08 |
-
1981
- 1981-08-14 JP JP12807781A patent/JPS5757946A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0475918A2 (en) * | 1990-09-14 | 1992-03-18 | PRODEA S.r.l. | An electronic control system for a hydrokinetic power-shift transmission for a motor vehicle |
EP0475918A3 (en) * | 1990-09-14 | 1993-10-20 | Prodea S R L | An electronic control system for a hydrokinetic power-shift transmission for a motor vehicle |
JPH04107565U (en) * | 1991-03-04 | 1992-09-17 | セイレイ工業株式会社 | tractor gearbox |
JPH07132754A (en) * | 1993-11-09 | 1995-05-23 | Yanmar Agricult Equip Co Ltd | Load control mechanism for tractor |
Also Published As
Publication number | Publication date |
---|---|
JPS628656B2 (en) | 1987-02-24 |
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