IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0067465
(2005-02-25)
|
우선권정보 |
DE-102 39 143(2002-08-27) |
발명자
/ 주소 |
- Knoff,Bernd
- Neugebauer,Dieter
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
4 |
초록
▼
In a power steering device comprising a power steering pump, and to a method for operating a power steering device for a vehicle comprising a hydraulic circuit provided with a rotary slide valve, a steering cylinder and a control valve for adjusting the volume flow of a hydraulic medium as required
In a power steering device comprising a power steering pump, and to a method for operating a power steering device for a vehicle comprising a hydraulic circuit provided with a rotary slide valve, a steering cylinder and a control valve for adjusting the volume flow of a hydraulic medium as required for steering assistance, the control valve is arranged on the pressure side of the pump in such a way that it divides the volume flow (Q) from the power steering pump into at least a first base partial flow (A) and a second controlled partial flow (B), the base partial flow (A) being independent from the operating state of the control valve and always available for steering assistance, whereas the partial flow (B) is dependent on the operating state of the control valve.
대표청구항
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What is claimed is: 1. A power steering device for a vehicle with a hydraulic circuit (11) including a power steering pump (1), a rotary slide valve (5), a steering cylinder (6) and an electromagnetic regulating valve (7), arranged on the delivery side of the power steering pump (1) for the demand-
What is claimed is: 1. A power steering device for a vehicle with a hydraulic circuit (11) including a power steering pump (1), a rotary slide valve (5), a steering cylinder (6) and an electromagnetic regulating valve (7), arranged on the delivery side of the power steering pump (1) for the demand-dependent control of a volume flow (Q) of a hydraulic medium, by dividing the volume flow (Q) flowing through the regulating valve (7) into a first basic part stream (A) which can flow to the rotary slide valve ( 5) independently of the operating state of the regulating valve ( 7), and a second regulated part stream (B), which is directed controllably back to the power steering pump (1) through a return line 9 or to the rotary slide valve (5) as a function of the operating state of the regulating valve (7). 2. A power steering device as claimed in claim 1, wherein, in the closed state, the regulating valve (7) has a through-flow passage (8) providing for a basic part stream (A) and the maximum regulated part stream (B) retuning through the return line 9. 3. A power steering device as claimed in claim 1, wherein, in the completely open state, the regulating valve (7) provides a throughflow through the passage 8 of the size of the sum of the basic part stream (A) and the maximum regulated part stream (B). 4. The power steering device as claimed in claim 1, wherein in the regulating valve (7) excess hydraulic medium is supplied to a return line (9). 5. The power steering device as claimed in claim 1, wherein the regulating valve (7) is open in an inoperative state. 6. The power steering device as claimed in claim 1, wherein the regulating valve (7) is integrated structurally into the power steering pump (1). 7. A method for operating a power steering with a hydraulic circuit (11) including a power steering pump (1), a rotary slide valve (5), a power steering cylinder (6) and an electromagnetic regulating valve (7), arranged on the delivery side of the power steering pump (1) for the demand-dependent control of a volume flow (Q) of a hydraulic medium, wherein the volume flow Q of the power steering pump (1) is supplied to the magnetic regulating valve (7) and is divided thereby into a first basic part stream (A), which is independently circulated to the power steering cylinder (6) and a second regulated part stream (B), which is controlled by the regulating valve (7) as a function of demand and selectively supplied to the power steering cylinder (6) for steering assistance or returned to the power steering pump (1). 8. The method as claimed in claim 7, wherein, in an inoperative state of the regulating valve (7), the volume flow through the regulating valve (7) or parallel to the regulating valve (7) comprises at least the basic part stream (A). 9. The method as claimed in claim 7, wherein in the operative state of the regulating valve (7), the volume flow can be controlled down to the basic part stream (A) by activation of the regulating valve (7). 10. The method as claimed in claim 7, wherein, in straight ahead travel of the vehicle, the regulating valve (7) is energized whereby only the basic part stream (A) is supplied to the steering cylinder (6). 11. The method as claimed in claim 10, wherein, in the event of a steering action by a driver, the application off current to the regulating valve (7) is reduced, and the regulated part stream (B) is controlled by opening of the regulating valve (7) so that a controlled part thereof is added to the basic part stream (A).
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