GB926831A - 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 vehicles

Info

Publication number
GB926831A
GB926831A GB218362A GB218362A GB926831A GB 926831 A GB926831 A GB 926831A GB 218362 A GB218362 A GB 218362A GB 218362 A GB218362 A GB 218362A GB 926831 A GB926831 A GB 926831A
Authority
GB
United Kingdom
Prior art keywords
pipe
pump
driven
servomotor
grooves
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
Application number
GB218362A
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of GB926831A publication Critical patent/GB926831A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • B62D5/087—Sliding spool valves
    • 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
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

926,831. Vehicle power steering. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. Jan 22, 1962 [Feb. 18, 1961], No. 2183/62. Class 79(5). A power-assisted vehicle steering system comprises two continuously driven pressure medium pumps 3, 12 and a change-over valve 15 which operates automatically upon interruption of the supply of pressure medium from the pump 3 to a servomotor 2 to connect the servomotor to the pump 12. The pump 3 is driven by the vehicle engine and the pump 12 is driven through a one-way clutch from the gearbox output shaft or from the back axle. Alternatively both pumps may be driven by the vehicle engine. The changeover valve 15 (Figs. 3, 4) comprises an axially displaceable control piston 20 having annular grooves 26, 27, 28 co-operating with annular grooves 24, 25 in the bore 19 of a housing 18. The pressure of fluid supplied from a reservoir 8 by a pump 3 through a delivery pipe 4a to a chamber 23 normally overcomes the force of a spring 21 to retain the piston 20 in the position shown wherein the fluid supplied by the pump 3 passes via radial channels 32, the annular grooves 28, 25 and a pipe 4a to the servomotor 2 whilst fluid supplied by the pump 12 through a pipe 4b passes via the annular grooves 27, 24 and a return pipe 17 to a pipe 6 which returns fluid from the servomotor 2 to the reservoir 8. When the supply of fluid from the pump 3 to the chamber 23 is interrupted the spring 21 displaces the piston 20 whereby the grooves 27, 25 communicate to connect the pipe 4b to the pipe 4 and the control edges 37 of the grooves 28, 25 engage to disconnect the pipe 4a from the pipe 4. During piston displacement back pressure is prevented by connecting a chamber containing the spring 21 and the groove 24 with a passage 34 and by arranging that the chamber 23 is connected via a bore 30 and the grooves 26, 27 with the return pipe 17 before the control edges 37 engage. In Fig. 2 (not shown) the servomotor is supplied through two interconnected change-over valves from any one of two pumps driven by separate engines and one transmission driven pump. The two changeover valves may be combined in a single unit and the pumps may have individual pressure medium circuits with separate reservoirs and return pipes controlled by the change-over valves.
GB218362A 1961-02-18 1962-01-22 Improvements in or relating to power-assisted steering systems particularly for motor vehicles Expired GB926831A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ8563A DE1157945B (en) 1961-02-18 1961-02-18 Steering device with auxiliary power especially for motor vehicles

Publications (1)

Publication Number Publication Date
GB926831A true GB926831A (en) 1963-05-22

Family

ID=7620543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB218362A Expired GB926831A (en) 1961-02-18 1962-01-22 Improvements in or relating to power-assisted steering systems particularly for motor vehicles

Country Status (4)

Country Link
CH (1) CH403510A (en)
DE (1) DE1157945B (en)
GB (1) GB926831A (en)
SE (1) SE304691B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397311A1 (en) * 1977-07-15 1979-02-09 Zahnradfabrik Friedrichshafen ASSISTED STEERING MECHANISM FOR MOTOR VEHICLES
FR2405854A1 (en) * 1977-10-17 1979-05-11 Honda Motor Co Ltd ASSISTED STEERING SYSTEM FOR VEHICLES
EP0999116A1 (en) * 1998-11-06 2000-05-10 Trw Inc. Switching valve for a hydraulic power steering system
CN109667800A (en) * 2018-12-27 2019-04-23 潍柴动力股份有限公司 Automobile hydraulic system and vehicle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280557A (en) * 1965-03-11 1966-10-25 Ford Motor Co Safety control circuit for power steering unit
DE2721556A1 (en) * 1977-05-13 1978-11-16 Zahnradfabrik Friedrichshafen Fail=safe servo steering with two hydraulic circuits - has third standby servo pump on vehicle to replace defective pump
US6179072B1 (en) * 1999-10-13 2001-01-30 Deere & Company Supplemental charge for hydrostatic steering system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487618A (en) * 1949-11-08 Hydraulic steering powke
US2650669A (en) * 1949-05-02 1953-09-01 Gemmer Mfg Co Manual and hydraulic power actuated steering gear
US2791287A (en) * 1954-07-19 1957-05-07 Gen Motors Corp Hydraulic power steering mechanism
DE1044641B (en) * 1956-02-27 1958-11-20 Fulminawerk K G Franz Mueller Hydraulic power steering for motor vehicles
US2898737A (en) * 1957-12-20 1959-08-11 Allis Chalmers Mfg Co Flow control valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397311A1 (en) * 1977-07-15 1979-02-09 Zahnradfabrik Friedrichshafen ASSISTED STEERING MECHANISM FOR MOTOR VEHICLES
US4237993A (en) * 1977-07-15 1980-12-09 Zahnradfabrik Friedrichshafen Ag Auxiliary power steering for motor vehicles
FR2405854A1 (en) * 1977-10-17 1979-05-11 Honda Motor Co Ltd ASSISTED STEERING SYSTEM FOR VEHICLES
EP0999116A1 (en) * 1998-11-06 2000-05-10 Trw Inc. Switching valve for a hydraulic power steering system
US6173728B1 (en) 1998-11-06 2001-01-16 Trw Inc. Switching valve for a hydraulic power steering system
CN109667800A (en) * 2018-12-27 2019-04-23 潍柴动力股份有限公司 Automobile hydraulic system and vehicle

Also Published As

Publication number Publication date
DE1157945B (en) 1963-11-21
SE304691B (en) 1968-09-30
CH403510A (en) 1965-11-30

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