Governor for controlling hydraulic transmission

A governor for controlling a hydraulic transmission comprising:

• a housing;
• a flyweight assembly rotatable within said housing;
• a hydraulic control valve within said housing and axially movable between a first position providing normal control for the transmission, a second position for causing the transmission to increase its output speed and a third position for shutting down the transmission;
• means connecting said flyweight assembly to said valve such that increased rates of rotation thereof will sequentially move said valve from said third position through said second position to said first position;
• spring means in said housing biasing said valve for axial movement from said first position towards said second position;
• and
• hydraulic means for sensing a predetermined speed condition of said governor for axially shifting said valve from said second position to said third position.

A governor for controlling a hydraulic transmission comprising:

• a housing;
• a flyweight assembly rotatable within said housing;
• means for rotating said flyweight assembly;
• a transmission control port in said housing adapted to be in fluid communication with a hydraulic transmission to provide a hydraulic speed control signal thereto;
• a supply port in said housing adapted to be connected to a source of hydraulic fluid under pressure;
• a charge port in said housing adapted to be connected to a control valve for selective communication with said source;
• a control valve control port adapted to be connected to a control valve to provide a hydraulic signal thereto to cause the control valve to connect said charge port to said source;
• a valve movable within said housing for controlling pressure relationships between said supply port and said control port;
• means connecting said valve to said flyweight assembly for movement within said housing responsive to rotation of said flyweight assembly;
• and
• means including differential position surfaces operatively associated with said charge port responsive to pressure at said source being supplied to said charge port to said source for moving said valve to a position to cause the issuance of a hydraulic signal from said transmission control port representing a direction to shut down the transmission being controlled.

A governing system for controlling a hydraulic transmission, comprising:

• a housing;
• a flyweight assembly rotatable within said housing;
• a hydraulic control valve within said housing and movable between positions providing normal control for the transmission, causing the transmission to increase its output speed, and for shutting down the transmission;
• means connecting said flyweight assembly to said valve such that increased rates of rotation of said flyweight assembly will sequentially move said valve from said shutdown position through said output speed increasing position to said normal control position;
• means for sensing a predetermined underspeed condition of said flyweight assembly for moving said valve to said shutdown position;
• and time delay means for disabling said sensing means at said predetermined underspeed conditions during startup of the transmission.

A governing system for controlling a hydraulic transmission comprising:

• a housing;
• a flyweight assembly rotatable within said housing and adapted to be driven by the transmission;
• a hydraulic control valve within said housing and movable between positions providing normal control for the transmission, causing the transmission to increase its output speed, starting up the transmission and shutting down the transmission;
• means connecting said flyweight assembly to said valve so that said valve will be moved to at least some of the various positions in accordance with the transmission speed;
• said valve being shiftable from said startup position to said output speed increasing position at a relatively low transmission output speed;
• means for sensing a predetermined underspeed of said transmission less than normal operating speed and greater than said relatively low ouput speed and for shifting said valve to said shutdown position;
• and and
• means for disabling said sensing means at speeds up to and including said predetermined underspeed during startup of the transmission;
• whereby said transmission may be shifted to an overspeed condition during startup at a relatively low speed to quickly cause the transmission to come up to normal speeds with a minimum of shock loading and said transmission may be shutdown at a relatively high speed upon malfunction while avoiding excessive overspeeds causing damage to the transmission.