GB896859A - Improvements in or relating to hydraulic control mechanism - Google Patents
Improvements in or relating to hydraulic control mechanismInfo
- Publication number
- GB896859A GB896859A GB2774657A GB2774657A GB896859A GB 896859 A GB896859 A GB 896859A GB 2774657 A GB2774657 A GB 2774657A GB 2774657 A GB2774657 A GB 2774657A GB 896859 A GB896859 A GB 896859A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- lever
- oil
- cylinder
- 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.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements
- A01B63/1117—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements using a hitch position sensor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
896,859. Fluid-pressure servomotorcontrol systems. MASSEY - FERGUSON (UNITED KINGDOM) Ltd. Sept. 3, 1958 [Sept. 3, 1957], No. 27746/57. Class 135. [Also in Group XXXI] A tractor with an hyraulic powerlift mechanism has a piston 13 and cylinder 12 for raising, lowering or holding stationary a hitch-linkage connected thereto, a control valve 23 which is between the cylinder and a pump 17, which is subject to joint manual and automatic control and which is movable into an equilibrium position to supply hydraulic fluid to the cylinder and piston at a restricted rate sufficient to maintain a pressure to support the hitch-linkage when loaded; it also has a valve 21 to relieve the pump when it is supporting the load. A gear-wheel pump 17 draws oil through a filter 20 from the tractor sump 18 and feeds it through the valve 21 and a non-return valve 105 to a valve 23. The valve 23 is operated either by lever 38 or lever 39 according as the hand lever 36, to which they are both pivoted, is in its range A-B or its range B-C. In the range A-B the levers set the working depth subject to draft-control through the linkage 45, 46 as described in the Specification 896,858, in this Group, by causing the piston-rod 14 to rotate an arm 15 on a cross-shaft 16 which carries lift arms connected to the hitch linkage (not shown). In the range B-C the shaft 16 is moved similarly but, control is exercised by a cam 81 and stud 82 which serve to lift the lever 39 from the valve 23 when the shaft 16 reaches a position corresponding to the setting of lever 36. When the spool 31 of valve 23 is fully raised oil at pressure is fed through a non-return valve 24 to the cylinder 12 excess oil is discharged through the valve 21. At " draft control " the lever 38 depresses the spool so that most of the oil is returned to the sump 18 through the orifice 26 and the load on the hitch-linkage forces oil from the cylinder under the valve 24, past a check valve 125 which closes if the flow is too rapid and out through an adjustable valve 121 to the orifice 26. If the load drops excessively the draft-control gear operates to cause lever 38 to release the spool 31, so that after alternate rising and falling a position of equilibrium is reached with the outlet 26 almost closed and the oil being delivered to the cylinder at a restricted rate. Operation at " position control " is similar, but the spool 31 is brought to its equilibrium position by action of the cam 81 on the lever 39. In neither instance does the equilibrium position correspond to any fixed position of the hand lever. The relief valve 21 relies for its operation on the pressure differences between the top 94 and bottom internal surfaces of its piston due to the hole 101. When the difference is sufficient to overcome the spring 95 the valve rises and snaps open due to additional pressure of the oil which reaches the underside of the piston. If desired, the valve 21 can be reset by opening the valve 121 by hand. Specification 896,860 also is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2774657A GB896859A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to hydraulic control mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2774657A GB896859A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to hydraulic control mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
GB896859A true GB896859A (en) | 1962-05-23 |
Family
ID=10264596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2774657A Expired GB896859A (en) | 1957-09-03 | 1957-09-03 | Improvements in or relating to hydraulic control mechanism |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB896859A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109357894A (en) * | 2018-11-07 | 2019-02-19 | 吉林大学 | Tractor rear suspension system off-line test device and its detection method |
CN110061571A (en) * | 2019-05-09 | 2019-07-26 | 东北农业大学 | A kind of high-frequency microwave formula wireless charging device and its application method |
-
1957
- 1957-09-03 GB GB2774657A patent/GB896859A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109357894A (en) * | 2018-11-07 | 2019-02-19 | 吉林大学 | Tractor rear suspension system off-line test device and its detection method |
CN109357894B (en) * | 2018-11-07 | 2024-03-15 | 吉林大学 | Off-line detection device and detection method for rear suspension system of tractor |
CN110061571A (en) * | 2019-05-09 | 2019-07-26 | 东北农业大学 | A kind of high-frequency microwave formula wireless charging device and its application method |
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