192 clutches and power-stop control – Clutches – Operators
Patent
1990-03-21
1992-07-21
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Operators
192 85C, 192103F, 13762569, F16D 2500
Patent
active
051315149
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hydraulic clutch control system for a transmission, and more particularly to the hydraulic clutch control system which enables pressurized oil confined within a clutch piston chamber to flow out of the chamber in a moment upon disengagement of a clutch of the transmission.
BACKGROUND OF THE INVENTION
Hitherto, as shown in FIG. 1, a conventional hydraulic clutch control system of this kind is constructed of a flow-rate detecting valve 104 and a pressure control valve 106. In the flow-rate detecting valve 104 of the conventional hydraulic clutch control system, as shown in FIG. 1, when the clutch piston chamber 114 of the transmission is filled with the pressurized oil, a spool valve 102 maintained in its neutral position under the influence of resilient forces exerted by springs 100, 101 is shifted leftwardly as viewed in FIG. 1 to its open position under the influence of a differential pressure of the pressurized oil acting on opposite sides of each of orifices 103 formed in the spool valve 102 whereby a large amount of the pressurized oil is allowed to flow from a pressurized-oil supply pump 113 into the clutch piston chamber 114. After completion of filling of the clutch piston chamber 114 with the pressurized oil, the spool valve 102 is shifted rightwardly as viewed in FIG. 1 to its closed position under the influence of a hydraulic force acting on the spool valve 102, which hydraulic force is produced by a difference in area of the spool valve 102 subjected to the pressurized oil. On the other hand, in the pressure control valve 106 of the conventional hydraulic clutch control system for the transmission, when a linear solenoid 105 is energized to conduct shifting operation of the transmission, the pressurized oil is supplied from the pump 113 to the flow-rate detecting valve 104 to open the valve 104. After completion of supplying of the pressurized oil to the the flow-rate detecting valve 104, a pressure of the pressurized oil filled in the clutch piston chamber 114 is gradually built-up through the pressure control valve 106.
In the conventional hydraulic clutch control system having the above construction for the transmission, when draining operation thereof is conducted, the above linear solenoid 105 is de-energized so that a spool 107 of the pressure control valve 106 shifts rightwardly as viewed in FIG. 1 under the influence of a resilient force exerted by a spring 108 to permit a drain port 109 to communicate with a oil passage 110, whereby the pressurized oil confined within the clutch piston chamber 114 flows out of the chamber to sequentially pass through a clutch port 111, orifices 103, oil chamber 112, oil passage 110 and the drain port 109, as indicated by arrows shown in FIG. 1.
Due to the above construction, the conventional hydraulic clutch control system for the transmission suffers from a so-called trouble "clutch dragging" resulted from a poor discharge rate of the pressurized oil from the clutch piston chamber 114.
SUMMARY OF THE INVENTION
In view of the above circumstances, the present invention was made. It is an object of the present invention to resolve the trouble "clutch dragging" by providing a hydraulic clutch control system for a transmission which enables the pressurized oil to flow out of the clutch piston chamber in a moment upon disengagement of the clutch.
The above object of the present invention is accomplished by providing:
A hydraulic clutch control system for a transmission, comprising a hydraulic clutch control valve constructed of: a flow-rate detecting valve provided with a spool valve which is maintained in its neutral position under the influence of resilient forces exerted by spring means upon filling of a clutch piston chamber of the transmission with pressurized oil, while provided with orifices in opposite sides of which are provided a pair of pressure chambers in which are built up pressurized-oil's pressures different from each other to shift the spool valve of the flow-rate detecting val
REFERENCES:
patent: 3025717 (1962-03-01), Christenson
patent: 3640360 (1972-02-01), Dollase
patent: 3656600 (1972-04-01), Kitano et al.
patent: 3991865 (1976-11-01), Komatsu
patent: 4029188 (1977-06-01), Okanu
patent: 4046160 (1977-09-01), Horsch
patent: 4046162 (1977-09-01), Rodeghiero
patent: 4751866 (1988-06-01), Blake
Braun Leslie A.
Kabushiki Kaisha Komatsu Seisakusho
Pitts Andrea
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