[특허]Variable displacement pump having a changeover value for a pressure chamber

Variable displacement pump having a changeover value for a pressure chamber 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04C-015/04
출원번호	US-0380575 (1995-01-30)
우선권정보	JP-0052659 (1994-02-28)
발명자 / 주소	Fujii Tadaaki (Saitama JPX) Iwata Hiroto (Saitama JPX) Kimura Yuuichi (Saitama JPX)
출원인 / 주소	Jidosha Kiki Co., Ltd. (Tokyo JPX 03)
인용정보	피인용 횟수 : 42 인용 특허 : 0

초록 ▼

A cam ring for forming a pump chamber on the outer periphery of a rotor which is rotatable in a body is arranged movably, and is urged in a direction in which the volume of the pump chamber is made maximum. Sealing means are interposed in an annular gap space on the outer periphery of the cam ring between the cam ring and the body, thereby forming first and second fluid-pressure chambers for allowing the cam ring to undergo displacement by moving. A spool-type changeover valve is provided which is operated in accordance with the discharge flow rate of the pressure fluid from the pump chamber to control the fluid pressure supplied to the first and second fluid-pressure chambers. The fluid pressure on the downstream side of a metering orifice 29 provided in a pump discharge-side passage 28 is introduced into the second fluid-pressure chamber for imparting moving displacement in the direction in which the volume of the pump chamber is made maximum, through a passage 37 via a second valve chamber 32b. It is possible to control the swinging of the cam ring, and to prevent fluctuations in the flow rate and a decline in the flow rate on the discharge side of the pump.

대표청구항 ▼

A variable displacement pump comprising: a pump body having an accommodating space and a plurality of passages; a rotor having vanes and disposed rotatably in said accommodating space of said pump body; a cam ring displaceably arranged around said rotor in said accommodating space of said pump body to form a variable pump chamber between said cam ring and an outer periphery of said rotor, and variable first and second fluid-pressure chambers between an outer periphery of said cam ring and said pump body with the aid of sealing means; a metering orifice provided in a pump discharge-side passage; urging means for urging said cam ring in a direction in which the volume of said pump chamber is made maximum; and a spool-type changeover valve means for controlling fluid pressure applied to said first and second fluid-pressure chambers in accordance with a discharge flow rate of pressured fluid from said pump chamber and a pressure differential between upstream and downstream sides of said metering orifice, wherein the fluid pressure on the downstream side of said metering orifice is introduced into said second fluid-pressure chamber which is provided for enabling the displacement of said cam ring in the direction in which the volume of said pump chamber is increased.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Variable displacement pump having a changeover value for a pressure chamber 원문보기

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Variable displacement pump having a changeover value for a pressure chamber 원문보기

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이 특허를 인용한 특허 (42)

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