Valve apparatus for controlling hydraulic pressure for a clutch or a brake and method for controlling hydraulic pressure
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16D-025/14
출원번호
US-0863277
(2001-05-24)
우선권정보
JP-2000-164494 (2000-06-01)
발명자
/ 주소
Hiroaki Kitamoto JP
Kaoru Hasegawa JP
Kenjiro Shimada JP
출원인 / 주소
Komatsu Ltd. JP
대리인 / 주소
Wenderoth, Lind & Ponack, L.L.P.
인용정보
피인용 횟수 :
37인용 특허 :
2
초록▼
Hydraulic pressure is controlled, which has such advantages that a generation of peak pressure (shoot pressure) can be lowered, mis-operation due to biting of particles can be reduced, or the cost thereof can be reduced. First, a large amount inflow command current is supplied to a proportional sole
Hydraulic pressure is controlled, which has such advantages that a generation of peak pressure (shoot pressure) can be lowered, mis-operation due to biting of particles can be reduced, or the cost thereof can be reduced. First, a large amount inflow command current is supplied to a proportional solenoid from a time point t1 to a time point t2. Consequentially, pilot pressure rises in a pilot pressure receiving chamber, so that a pressure control valve allows a large amount of hydraulic fluid to flow in a clutch or brake cylinder. At this time, potential detected by a pressure switch becomes zero level. Next, at the time point t2, a filling command small current is supplied to the proportional solenoid, thereby decreasing the amount of hydraulic fluid, which flows from an input port to an output port. This state is maintained from the time point t2 to a time point t3. At the termination of filling, peak pressure will not be generated, and a speed-changing shock in a clutch will not be generated, so that smooth switching can be accomplished.
대표청구항▼
1. A valve apparatus for controlling hydraulic pressure for a clutch or brake, said valve apparatus comprising:a pressure control valve having an output port, said pressure control valve also having a clutch or brake cylinder inner pressure feedback chamber at one end thereof and a pilot pressure re
1. A valve apparatus for controlling hydraulic pressure for a clutch or brake, said valve apparatus comprising:a pressure control valve having an output port, said pressure control valve also having a clutch or brake cylinder inner pressure feedback chamber at one end thereof and a pilot pressure receiving chamber at another end thereof, said pressure control valve being adapted to introduce clutch or brake engagement pressure hydraulic fluid, which is to flow into a clutch or brake cylinder hydraulic chamber, into said clutch or brake cylinder inner pressure feedback chamber, and being operable to increase a hydraulic fluid pressure of the clutch or brake engagement pressure hydraulic fluid to balance with a magnitude of pilot pressure generated in said pilot pressure receiving chamber such that said pressure control valve controls a clutch or brake cylinder pressure; a pilot fluid passage having a throttle, said pilot fluid passage adapted to allow the clutch or brake engagement pressure hydraulic fluid to flow as pilot fluid to said pilot pressure receiving chamber of said pressure control valve; a pressure proportional valve having a valve element, said pressure proportional valve being operable to control a pressure of the pilot fluid that flows into said pilot pressure receiving chamber by positioning said valve element at one of a drain interruption position, a throttle position, and a drain release position; a proportional solenoid being operable to change a position of said valve element of said pressure proportional valve against the flow of the pilot fluid, and control a magnitude of the pressure of the pilot fluid; and a pressure switch communicating with said output port of said pressure control valve, said pressure switch being operable to detect a clutch or brake initial engagement hydraulic fluid pressure when the clutch or brake cylinder hydraulic chamber is being filled with the clutch or brake engagement pressure hydraulic fluid.
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이 특허에 인용된 특허 (2)
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