[특허]Hydraulic power steering system with charging valve and air cushion in the tank

ixetic Bad Homburg GmbH

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특허 상세정보

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Hydraulic power steering system with charging valve and air cushion in the tank

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-049/00 F16K-024/00 F16K-017/26
미국특허분류(USC)	417/309; 137/493.6; 137/493.8; 137/493
출원번호	US-0919088 (2006-03-31)
등록번호	US-8657590 (2014-02-25)
우선권정보	DE-10 2005 019 059 (2005-04-23)
국제출원번호	PCT/DE2006/000585 (2006-03-31)
§371/§102 date	20071023 (20071023)
국제공개번호	WO2006/114074 (2006-11-02)
발명자 / 주소	Parsch, Willi
출원인 / 주소	ixetic Bad Homburg GmbH
대리인 / 주소	Davidson, Davidson & Kappel, LLC
인용정보	피인용 횟수 : 0 인용 특허 : 24

초록

A hydraulic power steering system which includes a tank and a power steering pump which takes in a pressure medium from an intake area which is decoupled from the prevailing atmospheric pressure on the side of the tank wall and delivers it under pressure to the power steering system. A valve device builds up a pre-pressure in the intake area and prevents a negative pressure and a positive pressure from building up on the interior of the oil tank.

대표
청구항
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1. A hydraulic power steering system comprising: a tank;a suction area; anda power steering pump drawing in a pressure medium from the suction area and delivering it under pressure into the power steering system;wherein the suction area of the power steering system is hermetically isolated from the atmosphere and has a valve device for building up a bias pressure in the suction area, the valve device including a closure member and a valve seat, the closure member moving away from the valve seat when there is a negative pressure in the suction area and the valve seat moving away from the closure member when there is an excessive pressure in the suction area. 2. The power steering system as recited in claim 1 wherein the valve device includes a check valve for drawing in air when there is a negative pressure in the suction area, and a pressure-limiting valve or counterbalance valve for releasing air when there is excessive pressure in the suction area. 3. The power steering system as recited in claim 2 wherein the check valve and the pressure limiting valve each have an opening pressure, the opening pressure of the check valve being smaller than the opening pressure of the pressure limiting valve. 4. The power steering system as recited in claim 2, wherein the check valve and the pressure limiting valve are arranged in a common valve housing forming a single valve device. 5. The power steering system as recited in claim 2 wherein the check valve includes a valve seat sleeve including the valve seat and the check valve includes the closure member, the valve seat sleeve and the closure member together forming a pressure-limiting valve piston. 6. The power steering system as recited in claim 5 wherein the closure member is a ball. 7. A hydraulic power steering system comprising: a tank;a suction area; anda power steering pump drawing in a pressure medium from the suction area and delivering it under pressure into the power steering system;wherein the suction area of the power steering system is hermetically isolated from the atmosphere and has a valve device for building up a bias pressure in the suction area;wherein the valve device includes a check valve for drawing in air when there is a negative pressure in the suction area, and a pressure-limiting valve or counterbalance valve for releasing air when there is excessive pressure in the suction area;wherein the check valve includes a valve seat sleeve and a closure member, the valve seat sleeve and the closure member together forming a pressure-limiting valve piston;wherein the valve seat sleeve and the closure member of the pressure limiting valve piston limit pressure by jointly moving against an opening pin, the opening pin pushing the closure member away from the valve seat sleeve, thus opening the check valve. 8. The power steering system as recited in claim 7, wherein the opening pin is mounted on a support sleeve, the support sleeve having passage openings. 9. The power steering system as recited in claim 5 wherein the closure member of the check valve is pressed against the valve seat sleeve by a first spring. 10. The power steering system as recited in claim 5 wherein the valve seat sleeve is pressed by a second spring against a stop in the valve housing, the second spring being stronger than the first spring. 11. The power steering system as recited in claim 10 wherein the valve device includes an opening pin and the valve seat sleeve is pressed away from the opening pin. 12. The power steering system as recited in claim 4 wherein the valve housing includes a valve seat sleeve, a check valve, a first spring, a second spring, an opening pin with a support sleeve having passage openings and an opening to the atmosphere, the second spring being stronger than the first spring. 13. The power steering system as recited in claim 4 wherein the valve housing is disposed in or on the tank. 14. The power steering system as recited in claim 4 further comprising a tank cap wherein the valve housing is disposed on the tank cap. 15. A hydraulic power steering system comprising: a tank; a suction area; and a power steering pump drawing in a pressure medium from the suction area and delivering it under pressure into the power steering system; wherein the suction area of the power steering system is hermetically isolated from the atmosphere and has a valve device for building up a bias pressure in the suction area; wherein the tank includes an oil column, the oil column acting as a piston for biasing or drawing in air in the suction area; wherein the valve device includes a closure member, a valve seat and an opening pin, the opening pin causing the valve seat to move away from the closure member when there is an excessive pressure in the suction area. 16. The power steering system as recited in claim 1 wherein the power steering pump has a suction pressure, the suction pressure being increased by the bias of the air in the tank or suction area. 17. The power steering system as recited in claim 4 wherein the single valve device is integrated into a cap of the tank or the suction area. 18. The power steering system as recited in claim 1 wherein the valve device further includes an opening pin, the opening pin causing the valve seat to move away from the closure member when there is an excessive pressure in the suction area. 19. The power steering system as recited in claim 18 wherein the valve device further includes a support sleeve, the opening pin being mounted on the support sleeve, the support sleeve having passage openings. 20. The power steering system as recited in claim 18 wherein the valve device further includes two springs and the valve seat is included on a valve seat sleeve, the valve seat sleeve compressing one of the springs so the opening pin contacts the closure member when there is excessive pressure in the suction area.

이 특허에 인용된 특허 (24)

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구성항목	관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
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특허 상세정보

Hydraulic power steering system with charging valve and air cushion in the tank

초록

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이 특허에 인용된 특허 (24)

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특허 상세정보

Hydraulic power steering system with charging valve and air cushion in the tank

초록

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이 특허에 인용된 특허 (24)

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상세정보조회

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IPC 상세정보(version : 201201)

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