[특허]Hydraulic motor device with displacement selector and a braking system

Poclain Hydraulics Industrie

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특허 상세정보

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Hydraulic motor device with displacement selector and a braking system

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-031/02
미국특허분류(USC)	303/015; 303/003; 060/436; 060/439
출원번호	US-0450631 (2001-12-20)
우선권정보	FR-0017171 (2000-12-28)
국제출원번호	PCT//FR01/04097 (2003-06-17)
§371/§102 date	20030617 (20030617)
국제공개번호	WO02//05390 (2002-07-11)
발명자 / 주소	Bigo, Louis Ruzicka, Daniel Allart, Bernard
출원인 / 주소	Poclain Hydraulics Industrie
대리인 / 주소	Ladas &
인용정보	피인용 횟수 : 4 인용 특허 : 7

초록
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Hydraulic motor drive apparatus having a cubic capacity selector (16) which has at least two positions, control means for controlling the selector, which means comprise a hydraulic control chamber (18) suitable for being fed with fluid via a control duct (20), and first opposing return means (17). The apparatus further comprises a brake system having a brake release chamber (38) and second opposing return means (39). The control duct (20) is suitable for being connected to the brake release chamber (38), and the first return means (17) are suitable for returning the cubic capacity selector to its large cubic capacity first position when the pressure in said chamber becomes lower than a first threshold pressure, whereas the second return means (39) return the brake means (36) to their braking position when the pressure in the brake release chamber becomes lower than a second threshold pressure, which is itself lower than said first threshold pressure.

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청구항
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1. Drive apparatus with a hydraulic motor having a cubic capacity selector suitable for being moved between a first position corresponding to a large active operating cubic capacity and a second position corresponding to a small active operating cubic capacity, the apparatus comprising control means for controlling the selector, which means comprise a hydraulic control chamber suitable for being fed with fluid under pressure via a control duct for the purpose of urging the cubic capacity selector to move to its second position against the force exerted by first return means, the apparatus further comprising a brake system for braking the hydraulic motor, which brake system comprises brake means mounted to move between a braking position and a brake release position, and a brake release chamber suitable for being fed with fluid under pressure via a brake release duct for the purpose of urging said brake means towards their brake release position against the force exerted by second return means, the control duct being suitable for being connected to the brake release chamber for the purpose of putting said brake release chamber into communication with the control chamber, and in the first return means being suitable for returning the cubic capacity selector to its large cubic capacity first position when, while the control chamber is communicating with the brake release chamber via the control duct, the pressure in said brake release chamber becomes lower than a first threshold pressure, whereas the second return means are suitable for returning the brake means to their braking position when the pressure in the brake release chamber becomes lower than a second threshold pressure which is lower than said first threshold pressure.2. Apparatus according to claim 1, wherein the control means for controlling the cubic capacity selector further comprise a feed selector suitable for taking up a first configuration in which said feed selector puts the control duct into communication with the fluid return, and a second configuration in which said feed selector puts the control duct into communication with a fluid feed duct, the feed duct communicating continuously with the brake release chamber.3. Apparatus according to claims 2, wherein the brake release chamber is connected to the feed duct of the hydraulic motor and the feed duct is connected to a feed main duct for feeding the motor with fluid at high pressure via a pressure reducer.4. Apparatus according to claim 2, wherein the feed selector includes a first link duct suitable for putting the control duct into communication with a fluid return when said selector is in the first configuration, said first link duct having a constriction.5. Apparatus according to claim 2, wherein the feed selector has a second link duct suitable for putting the control duct into communication with the feed duct when said selector is in the second configuration, said second link duct having a constriction.6. Apparatus according to claim 1, wherein the cubic capacity selector comprises a moving slide and the control means for controlling the cubic capacity selector further comprise an additional hydraulic control chamber suitable for being fed with fluid under pressure via an additional control duct, the hydraulic chamber and the additional hydraulic chamber respectively having first and second moving walls which respectively define in said chambers first and second bearing surfaces for the fluid present in said chambers, and which respectively form first and second control pistons suitable for cooperating with the moving slide of the cubic capacity selector, and the bearing surfaces being such that, when the pressure in the brake release chamber which is in communication with the control chamber becomes lower than the first threshold pressure, the force exerted by the second piston on the slide of the selector is insufficient to hold said slide in its second position, independently of the fluid pressure that prevails in the additional control chamber.7. Apparatus according to claim 6, wherein the brake release chamber is connected to the feed duct of the hydraulic motor.8. Apparatus according to claim 6, wherein the control duct communicates continuously with the brake release duct.9. Apparatus according to claim 8, wherein the control duct communicates continuously with the brake release duct via a constriction.10. Apparatus according to claim 1, wherein the cubic capacity selector has three ports, first and second ports of said cubic capacity selector being connected together and isolated from a third port thereof when said cubic capacity selector is in the first position, while said second and third ports are connected together and isolated from the first port when said selector is in its second position, and wherein said cubic capacity selector is suitable for taking up an intermediate position between the first and second positions thereof, and in which said three ports are interconnected and a cross-section of at least one of passageways between the first and second ports and between the second and third ports is constricted.11. Apparatus according to claim 10, wherein further comprising means for holding the selector in the intermediate position for a lapse of time.12. Apparatus according to claim 1, wherein the first threshold pressure lies in the range 15 bars to 20 bars, while the second threshold pressure lies in the range 9 bars to 10 bars.13. Apparatus according to claim 1, wherein a difference between the first and second threshold pressures lies in the range 5 bars to 10 bars.14. Apparatus according to claim 1, wherein the brake release chamber is connected to the feed duct of the hydraulic motor.15. Apparatus according to claim 1, wherein the cubic capacity selector comprises a moving slide having an annular portion which defines a moving wall of the control chamber that forms a bearing surface against which the pressure of the fluid present in said chamber is exerted to urge the slide to move into its second position.

이 특허에 인용된 특허 (7)

이 특허를 인용한 특허 피인용횟수: 4

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특허 상세정보

Hydraulic motor device with displacement selector and a braking system

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이 특허에 인용된 특허 (7)

이 특허를 인용한 특허 피인용횟수: 4

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Hydraulic motor device with displacement selector and a braking system

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이 특허에 인용된 특허 (7)

이 특허를 인용한 특허 피인용횟수: 4

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IPC 상세정보(version : 201201)

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