GB2305898A - Vehicle steering hydraulic pump drive - Google Patents

Vehicle steering hydraulic pump drive Download PDF

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Publication number
GB2305898A
GB2305898A GB9520039A GB9520039A GB2305898A GB 2305898 A GB2305898 A GB 2305898A GB 9520039 A GB9520039 A GB 9520039A GB 9520039 A GB9520039 A GB 9520039A GB 2305898 A GB2305898 A GB 2305898A
Authority
GB
United Kingdom
Prior art keywords
clutch
steering
hydraulic pump
vehicle
incorporated
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.)
Withdrawn
Application number
GB9520039A
Other versions
GB9520039D0 (en
Inventor
Fane Robert Conant Murray
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9520039A priority Critical patent/GB2305898A/en
Publication of GB9520039D0 publication Critical patent/GB9520039D0/en
Publication of GB2305898A publication Critical patent/GB2305898A/en
Withdrawn legal-status Critical Current

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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
    • B62D5/065—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 specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

A hydraulic power steering pump is driven from a vehicle engine through an electromagnetically-controlled clutch. The clutch is engaged by springs or permanent magnets and disengaged electromagnetically to ensure that the pump will operate if the control fails. Control of the clutch may be in response to steering wheel torque or vehicle speed. The clutch can be wet or dry, single plate or multiplate.

Description

VEHICLE STEERING HYDRAULIC PUMP DRIVES Background to invention Power assistance for vehicle steering systems are usually provided by a hydraulic pump driven from a rotating element of the vehicle s power plant.
The pump operates even when little or power assistance is required, for example when the vehicle is moving in a substantially straight line. Thus, for much of the vehicle operating time power is wasted and the system is subjected to unecessary wear and tear.
To overcome this problem it has been suggested that the power steering hydraulic pump should be driven independently by means of an electric motor when conditions require power assistance. Such a drive system has the disadvantage of high current consumption and unecessary complication to achieve the objective.
The present invention According to the present invention the hydraulic pump which provides power assistance for a vehicle steering is driven directly from the power plant via an-electromagnetic clutch. The clutch may be single or multiplate operating in air or immersed in a fluid. The fluid could be the system hydraulic fluid itself.
The clutch may be mounted externally or internally with respect to the pump body. Alternatively it could be mounted on the driving end of the pump drive.
The clutch is energized when required from the electrical system of the vehicle and the pump is then driven normally Alternatively the clutch may be engaged normally by means of a spring or springs or by one or more permanent magnets. Such a clutch would be disengaged by powering it from the electical system of the vehicle.

Claims (5)

1. An apparatus for controlling a hydraulic power steering system to turn or assist turning the steerable wheels of a vehicle, the said apparatus being a dry or wet plate single or multiplate clutch in which the rotatable input member and the rotatable output member are held in engagement by means of springs, permanent magnets or the like. The said clutch may be disengaged by applying an e.m.f to an electromagnet or electromagnets, the force of which oppose that of the springs, permanent magnets or the like. Thus the rotatable input member may rotate freely without necessarily transmitting torque to the rotatable output member.
The control system of the said clutch which is responsive to vehicle speed, torque applied by the driver of the vehicle to the steering column or other enviromental factors is configured to engage the clutch with minimal slip time.
In case of electrical failure of the clutch or associated control system, steering power assistance is available at all times.
2. As claim 1 but where the clutch is incorporated within the casing of the steering hydraulic pump but is separated from the hydraulic system fluid therein.
3. As claim 1 but where the clutch is incorporated within the casing of the steering hydraulic pump and operates in the system hydraulic fluid.
4. As claim 1 but where the clutch, incorporated within the casing of the steering hydraulic pump and operating in the system hydraulic fluid, is so configured that the rotatable input member can transmit a limited amount of torque to the rotatable output member even when the clutch is disengaged.
5. As claims 1,2 and 3 but where the clutch is connected to the driving member eg. a belt pulley on the vehicle power plant instead of being incorporated within or attached to the steering hydraulic pump.
GB9520039A 1995-10-02 1995-10-02 Vehicle steering hydraulic pump drive Withdrawn GB2305898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9520039A GB2305898A (en) 1995-10-02 1995-10-02 Vehicle steering hydraulic pump drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9520039A GB2305898A (en) 1995-10-02 1995-10-02 Vehicle steering hydraulic pump drive

Publications (2)

Publication Number Publication Date
GB9520039D0 GB9520039D0 (en) 1995-12-06
GB2305898A true GB2305898A (en) 1997-04-23

Family

ID=10781599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9520039A Withdrawn GB2305898A (en) 1995-10-02 1995-10-02 Vehicle steering hydraulic pump drive

Country Status (1)

Country Link
GB (1) GB2305898A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998047755A1 (en) * 1997-04-22 1998-10-29 Fane Robert Conant Murray Vehicle steering hydraulic pump drives
WO2003078236A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044733A1 (en) * 1980-07-18 1982-01-27 Nissan Motor Co., Ltd. Vehicle hydraulic power steering system with means for controlling the operation of a power steering pump
US4643269A (en) * 1985-10-10 1987-02-17 Ford Motor Company Power steering system for an automotive vehicle having a power steering pump cut out circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044733A1 (en) * 1980-07-18 1982-01-27 Nissan Motor Co., Ltd. Vehicle hydraulic power steering system with means for controlling the operation of a power steering pump
US4643269A (en) * 1985-10-10 1987-02-17 Ford Motor Company Power steering system for an automotive vehicle having a power steering pump cut out circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998047755A1 (en) * 1997-04-22 1998-10-29 Fane Robert Conant Murray Vehicle steering hydraulic pump drives
WO2003078236A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering
US7055644B2 (en) 2002-03-15 2006-06-06 Zf Lenksysteme Gmbh Power steering system with hydraulic power assistance

Also Published As

Publication number Publication date
GB9520039D0 (en) 1995-12-06

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)