Hydrostatically applied clutch system with multiplex master cylinders
AssigneeGeneral Motors Corporation
InventorsJames Borgerson, Clinton Carey, Paul Stevenson
Life of this patent
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Abstract
A power transmission incorporates a plurality of torque-transmitting mechanisms having stationary piston torque-transmitting mechanisms. Each of the torque-transmitting mechanisms is controlled by one or more hydraulic master cylinders, which provide hydrostatic apply pressure for the respective torque-transmitting mechanisms. The control apparatus may incorporate either two or three master cylinders for controlling five torque-transmitting mechanisms through a plurality of selectively operable valve mechanisms.
Claims5
An electro-hydraulic control apparatus for a power transmission incorporating at least five torque-transmitting mechanisms, said control apparatus comprising:
- at least two master cylinders operable to supply hydrostatic pressure;
- three control valve mechanisms disposed for fluid connection between one of said master cylinders and at least three of said torque-transmitting mechanisms;
- four control valve mechanisms disposed for fluid connection between said other master cylinder and at least four of said torque-transmitting mechanisms, two of which are also connectible with said one master cylinder.
An electro-hydraulic control valve mechanism for controlling the engagement and disengagement of a plurality of torque-transmitting mechanisms in a power transmission comprising:
- three master cylinders;
- said first master cylinders controlling the distribution of hydrostatic hydraulic fluid through first and second control valves to a first and second of said torque-transmitting mechanisms;
- said second master cylinders providing hydrostatic hydraulic control fluid through control valve means to at least two of said torque-transmitting mechanisms, one of which is also controlled by said first master cylinder;
- said third master cylinder being controllable to establish engagement and disengagement pressures for at least three of said torque-transmitting mechanisms, one of which is also controlled selectively by said first and second master cylinders;
- and
- a plurality of control valve means disposed between said master cylinders and said torque transmitting mechanisms for multiplexing the operation of the master cylinders.
An electro-hydraulic control apparatus for a power transmission incorporating at least five torque-transmitting mechanisms, said control apparatus comprising:
- a plurality of master cylinders operable to supply hydrostatic pressure;
- a first plurality of control valve means disposed between at least one of said master cylinders and at least two of said torque-transmitting mechanisms;
- a second plurality of control valve means disposed between at least one other of said other master cylinder and at least three of said torque-transmitting mechanisms, at least one of which are also connectible with said one master cylinder;
- and
- pressure sensor means connected with each of said master cylinders for sensing pressure generated thereby, and pressure sensor means connected with each of said torque transmitting mechanisms for sensing pressure received thereby.
Dependencies are inferred from the claim text.