192 clutches and power-stop control – Transmission control and clutch control – Common control
Patent
1990-09-13
1993-02-23
Braun, Leslie A.
192 clutches and power-stop control
Transmission control and clutch control
Common control
60415, 60586, 192 85CA, F15B 2100, F16D 2512, B60K 1710
Patent
active
051882043
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a power hydraulic system.
The power hydraulic system is of the type (hereinafter called "the type referred to") comprising a reservoir of hydraulic fluid, a control valve, conduit means connecting the reservoir with the control valve whereby hydraulic fluid may be supplied to the valve and returned therefrom to the reservoir, and said conduit means including therein a pump and an accumulator for the storing therein of hydraulic fluid under pressure delivered by the pump from the reservoir and for the supply of hydraulic fluid from said accumulator to the control valve.
In a power hydraulic system of the type referred to the control valve has service porting which can be connected by piping to an actuator operated by hydraulic pressure applied to said actuator, and the control valve has at least first and second states such that the valve in said first state connects the actuator to the supply of hydraulic fluid under pressure and in the second state the valve connects the actuator to the reservoir whereby hydraulic fluid can be returned to the reservoir from the actuator.
A semi-automatic transmission for a motor vehicle is known for driving at least one ground running wheel of the vehicle, using rotary output from an engine of the vehicle, the semi-automatic transmision being of the kind (hereinafter called "the kind referred to") comprising a change-speed gearbox having a rotary output shaft for supplying rotary motion to said ground running wheel and a rotary input shaft for receiving input torque from the engine and a plurality of gear ratios between said shafts each gear ratio being engageable and disengageable in response to operation of gear ratio selector means in response to manual action of a driver of the vehicle, clutch means engageable for transmitting torque to said input shaft from the engine and disengageable to interrupt the transmission of said torque to the input shaft, and clutch control means responsive to a first signal indicative of a wish by the driver to disengage the currently engaged said gear ratio and responsive to a second signal indicative that another said gear ratio has been engaged, and said clutch control means responding to said first signal to cause the clutch means to disengage and responding to said second signal to cause the clutch means to re-engage.
In a known semi-automatic transmission of the kind referred to the clutch control means comprises a power hydraulic system of the type referred to in which the control valve is connected by said piping to the actuator so that on occurrence of said first signal the control valve goes to said first condition and the actuator receives hydraulic fluid under pressure so that the actuator operates to cause disengagement of the clutch means, and on occurrence of said second signal the control valve goes to said second condition permitting return of hydraulic fluid to the reservoir from the actuator in which latter the hydraulic pressure drops to cause a re-engagement of the clutch means.
The actuator may be a piston and cylinder unit.
When building a vehicle comprising a semi-automatic transmission of the kind referred to the hydraulic clutch control means comprising the combination of said power hydraulic system of the type referred to and the piping and actuator is mounted in the vehicle on the production line, for example by installing the power hydraulic system and the actuator, and connecting to them the piping. Then the combination is filled with hydraulic fluid. This may be done by connecting a vacuum source to the combination to remove the air and then connecting the evacuated combination to a supply of hydraulic fluid to fill the combination with the fluid. This manner of providing the said combination has disadvantages. Firstly it requires reliable simultaneous supplies to the production line of the various component parts of the combination to be connected together on the line. Secondly the connecting together of those component parts on the line can be time consuming and increase the time
REFERENCES:
patent: 3061058 (1962-10-01), Barth
patent: 3861144 (1975-01-01), Woods
patent: 3918497 (1975-11-01), Schon
patent: 3985063 (1976-10-01), Lemon
patent: 4181016 (1980-01-01), Schapink
patent: 4599860 (1986-07-01), Parsons
patent: 4732642 (1988-02-01), Grunberg et al.
patent: 4854433 (1989-08-01), Tellert
patent: 4959957 (1990-10-01), Schmale et al.
patent: 4959960 (1990-10-01), LaFountain
patent: 4979366 (1990-12-01), Compton et al.
patent: 4987740 (1991-01-01), Coleman
patent: 5002166 (1991-03-01), Leigh-Monstevens et al.
patent: 5016739 (1991-05-01), Im
patent: 5040653 (1991-08-01), Vukovich et al.
patent: 5083433 (1992-01-01), Leigh-Monstevens
Arrowsmith David R.
Parsons David
Young Alastair J.
Automotive Products plc
Braun Leslie A.
Ta Khoi Q.
LandOfFree
Pre-filled power hydraulic system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pre-filled power hydraulic system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pre-filled power hydraulic system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2198861