GB1154851A - Improvements in or relating to Power-Assisted Steering Systems, particularly for Motor Vehicles - Google Patents
Improvements in or relating to Power-Assisted Steering Systems, particularly for Motor VehiclesInfo
- Publication number
- GB1154851A GB1154851A GB30180/66A GB3018066A GB1154851A GB 1154851 A GB1154851 A GB 1154851A GB 30180/66 A GB30180/66 A GB 30180/66A GB 3018066 A GB3018066 A GB 3018066A GB 1154851 A GB1154851 A GB 1154851A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- fluid
- valves
- control edges
- pressure
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
1,154,851. Power assisted steering. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. 5 July, 1966 [6 July, 1965], No. 30180/66. Heading B7H. In a control device for a power assisted steering mechanism, a casing 1 located within a groove 2 within a housing (not shown) is rotatable by the steering shaft acting through a torsion bar 3 and a pair of forks 5, 5<SP>1</SP>. A pair of control spool valves 8, 81 are slidable in bushes 11, 11<SP>1</SP> located within the casing and have control edges 12, 12<SP>1</SP> and 13, 13<SP>1</SP> which cooperate with control edges 15, 15<SP>1</SP> and 16, 16<SP>1</SP> formed in the bushes. The groove 2 is supplied with pressure fluid which, in the neutral position of the valves, Fig. 1, passes between the control edges 12<SP>1</SP>, 15<SP>1</SP> and 12, 15 into ducts 25, 25<SP>1</SP> and returns through ports 26, 26<SP>1</SP>, 21, 21<SP>1</SP> and grooves 24, 24<SP>1</SP> to spaces 10 and 10<SP>1</SP> which are connected to the fluid reservoir. With a clockwise steering movement, the valves 8 and 8<SP>1</SP> are displaced as shown in Fig. 2, and pressure fluid passing between the control edges 12<SP>1</SP> and 15<SP>1</SP> of valve 8<SP>1</SP> flows through duct 25<SP>1</SP> to one chamber 7 of the power assistance servomotor, to provide power assistance. Return fluid from the other chamber 7<SP>1</SP> of the servomotor is admitted through the port 211 and groove 24<SP>1</SP> to the space 10<SP>1</SP>. The control edges 12, 15; 13, 16 of valve 8 are closed. With an anti-clockwise steering movement, valves 8 and 81 are actuated conversely. At the lower part of each valve 8 and 8<SP>1</SP> is included a bush 31, 31<SP>1</SP> protruding from the end of the valve and enclosing a valve member 34, 34<SP>1</SP> slidable upon a stem 39, 39<SP>1</SP> and having an abutment face urged into contact with an abutment face on the bush by a spring 36, 36<SP>1</SP>. The protruding ends 31, 31<SP>1</SP> are enclosed within covers 38, 38<SP>1</SP> enclosing fluid spaces 43, 43<SP>1</SP> to which pressure fluid is admitted through passages 40, 45, 46 and 50. The upper faces 28, 28<SP>1</SP> of the valves 8 and 81 are smaller than the lower faces comprising the two parts 29, 29<SP>1</SP> and 30, 30<SP>1</SP>, but annular surfaces 17, 17<SP>1</SP> in the upper part become exposed to the pressure fluid in the upwardly displaced position of the valve. The combined surfaces 28, 17 (28<SP>1</SP>, 17<SP>1</SP>) may or may not be equal to the combined surfaces 29, 30 (29<SP>1</SP>, 30<SP>1</SP>) to give different " feel " characteristics. When they are equal, the fluid forces acting upon the upwardly displaced valve are balanced and there is a " feel " reaction force acting upon the other. Under heavy steering conditions, however, as when the vehicle is at rest, the fluid pressure will rise until in the chambers 43, 43<SP>1</SP>, it overcomes the force of the springs 36, 36<SP>1</SP>. With the upwardly displaced valve, however, say 8<SP>1</SP>, the fluid passages 42<SP>1</SP>, 45<SP>1</SP>, 46<SP>1</SP> are still in register because upward movement of the valve is limited by the head of stem 29<SP>1</SP>, so that this valve is still balanced by the fluid pressure, whereas in the other, the fluid in chamber 43 is cut off from passage 45 and opened into the interior of bush 31 and thence to exhaust through passage 52 (Fig. 3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ11634A DE1238789B (en) | 1965-07-06 | 1965-07-06 | Pressure medium control device in assisted steering systems, especially for motor vehicles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1154851A true GB1154851A (en) | 1969-06-11 |
Family
ID=7621972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30180/66A Expired GB1154851A (en) | 1965-07-06 | 1966-07-05 | Improvements in or relating to Power-Assisted Steering Systems, particularly for Motor Vehicles |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1238789B (en) |
ES (1) | ES328695A1 (en) |
GB (1) | GB1154851A (en) |
SE (1) | SE324716B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2295276A1 (en) * | 1974-12-21 | 1976-07-16 | Langen & Co | HYDRAULIC PRESSURE FLUID CONTROL EQUIPMENT |
FR2308537A1 (en) * | 1975-04-25 | 1976-11-19 | Bosch Gmbh Robert | Hydraulic servo-assisted steering for motor vehicle - has servo motor whose supply of hydraulic pressure fluid is monitored by control valve system |
WO1985000565A1 (en) * | 1983-07-23 | 1985-02-14 | Zahnradfabrik Friedrichshafen Ag | Pressure medium control unit for servo steerings |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1924032C3 (en) * | 1969-05-10 | 1981-06-04 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Pressure medium control device for power steering, in particular for motor vehicles |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1133642B (en) * | 1960-03-10 | 1962-07-19 | Zahnradfabrik Friedrichshafen | Pressure medium control device for power steering, in particular for motor vehicles |
-
1965
- 1965-07-06 DE DEZ11634A patent/DE1238789B/en active Pending
-
1966
- 1966-07-05 ES ES0328695A patent/ES328695A1/en not_active Expired
- 1966-07-05 GB GB30180/66A patent/GB1154851A/en not_active Expired
- 1966-07-06 SE SE9239/66A patent/SE324716B/xx unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2295276A1 (en) * | 1974-12-21 | 1976-07-16 | Langen & Co | HYDRAULIC PRESSURE FLUID CONTROL EQUIPMENT |
FR2308537A1 (en) * | 1975-04-25 | 1976-11-19 | Bosch Gmbh Robert | Hydraulic servo-assisted steering for motor vehicle - has servo motor whose supply of hydraulic pressure fluid is monitored by control valve system |
WO1985000565A1 (en) * | 1983-07-23 | 1985-02-14 | Zahnradfabrik Friedrichshafen Ag | Pressure medium control unit for servo steerings |
US4590965A (en) * | 1983-07-23 | 1986-05-27 | Zahnradfabrik Friedrichshafen, Ag. | Pressure agent control arrangement for auxiliary power steering mechanisms |
AU577045B2 (en) * | 1983-07-23 | 1988-09-15 | Zahnradfabrik Friedrichshafen Ag | Pressure medium control device |
Also Published As
Publication number | Publication date |
---|---|
ES328695A1 (en) | 1967-04-16 |
SE324716B (en) | 1970-06-08 |
DE1238789B (en) | 1967-04-13 |
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