WO1998047755A1 - Vehicle steering hydraulic pump drives - Google Patents

Vehicle steering hydraulic pump drives Download PDF

Info

Publication number
WO1998047755A1
WO1998047755A1 PCT/GB1997/001104 GB9701104W WO9847755A1 WO 1998047755 A1 WO1998047755 A1 WO 1998047755A1 GB 9701104 W GB9701104 W GB 9701104W WO 9847755 A1 WO9847755 A1 WO 9847755A1
Authority
WO
WIPO (PCT)
Prior art keywords
clutch
steering
hydraulic pump
vehicle
incorporated
Prior art date
Application number
PCT/GB1997/001104
Other languages
French (fr)
Inventor
Fane Robert Conant Murray
Original Assignee
Fane Robert Conant Murray
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 Fane Robert Conant Murray filed Critical Fane Robert Conant Murray
Priority to PCT/GB1997/001104 priority Critical patent/WO1998047755A1/en
Publication of WO1998047755A1 publication Critical patent/WO1998047755A1/en

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
    • B62D5/065—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

Definitions

  • Power assistance for vehicle steering systems are usually provided by a hydraulic pump driven from a rotating element of the vehicles power plant.
  • the pump operates even when little or no 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 unnecessary wear and tear.
  • 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 energised when required from the electrical system of the vehicle and the pump is then driven normally.
  • 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 electrical system of the vehicle.

Landscapes

  • 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 vehicles power plant.
The pump operates even when little or no 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 unnecessary 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 unnecessary 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 energised 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 electrical system of the vehicle.

Claims

Claims
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 environmental 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 operated 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.
PCT/GB1997/001104 1997-04-22 1997-04-22 Vehicle steering hydraulic pump drives WO1998047755A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/GB1997/001104 WO1998047755A1 (en) 1997-04-22 1997-04-22 Vehicle steering hydraulic pump drives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1997/001104 WO1998047755A1 (en) 1997-04-22 1997-04-22 Vehicle steering hydraulic pump drives

Publications (1)

Publication Number Publication Date
WO1998047755A1 true WO1998047755A1 (en) 1998-10-29

Family

ID=10806275

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001104 WO1998047755A1 (en) 1997-04-22 1997-04-22 Vehicle steering hydraulic pump drives

Country Status (1)

Country Link
WO (1) WO1998047755A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2376670A (en) * 2001-06-21 2002-12-24 Visteon Automotive Systems Inc Vehicle power steering dependent on speed
DE10211396A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering for automobile has clutch for disengaging drive motor from hydraulic pump
DE10211407A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering for automobile has electromagnetic valve controlling hydraulic pressure medium flow integrated in pump

Citations (3)

* 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
GB2305898A (en) * 1995-10-02 1997-04-23 Fane Robert Conant Murray Vehicle steering hydraulic pump drive

Patent Citations (3)

* 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
GB2305898A (en) * 1995-10-02 1997-04-23 Fane Robert Conant Murray Vehicle steering hydraulic pump drive

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2376670A (en) * 2001-06-21 2002-12-24 Visteon Automotive Systems Inc Vehicle power steering dependent on speed
DE10211396A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering for automobile has clutch for disengaging drive motor from hydraulic pump
DE10211407A1 (en) * 2002-03-15 2003-09-25 Zf Lenksysteme Gmbh Hydraulic power-assisted steering for automobile has electromagnetic valve controlling hydraulic pressure medium flow integrated in pump

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