Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1989-06-05
1990-08-28
Look, Edward K.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60491, F16H 6142
Patent
active
049514628
ABSTRACT:
A closed-loop hydrostatic transmission is disclosed of the type with a fluid pump (10) and a fluid motor (12), both of which are variable displacement. A pair of stroking cylinders (36,38) varies the displacement of the motor between minimum displacement and maximum displacement, under the control of a motor stroking valve (70) which includes a stroking valve member (90) movable in response to changes in fluid pressure in a pressure chamber (110). The displacement of the pump is controlled by a main controller (50) in response to movement of an input handle (60). Whenever the handle (60) is moved to the neutral position, a neutral switch (122) is closed, thus generating a neutral signal which is transmitted to an electromagnetic valve member (114), which controls the pressure in the fluid pressure chamber (110) to command the motor to maximum displacement. With the motor at maximum displacement, subsequent movement of the handle (60) away from the neutral position, to begin to propel the vehicle, results in a smoother start-up of the vehicle because the motor is at maximum displacement (a high-torque, low-speed condition). Starting the vehicle with the motor at maximum displacement also reduces the amount of rise of system pressure above the relief valve setting, thus reducing the amount of heat generated and the amount of horsepower wasted.
REFERENCES:
patent: 2395980 (1946-03-01), Wahlmark
patent: 3107490 (1963-10-01), Cooper et al.
patent: 3901031 (1975-08-01), Knapp et al.
patent: 4091617 (1978-05-01), Cornell
patent: 4167855 (1979-09-01), Knapp
patent: 4341133 (1982-07-01), Sakamoto
patent: 4461147 (1984-07-01), Myers
Eaton Corporation
Kapsalas George
Kasper L. J.
Look Edward K.
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