Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1984-10-26
1986-12-16
Staab, Lawrence J.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
474 28, 74868, B60K 4116
Patent
active
046287736
ABSTRACT:
System and method for controlling a continuously variable transmission having a pair of variable-diameter pulleys disposed on input and output shafts, and a corresponding pair of hydraulic cylinders to change effective diameters of the pulleys. A speed ratio control valve assembly is used to control flows of a fluid to and from one of the cylinders. The control valve assembly is selectively placed in one of three states consisting of a first state for feeding the fluid to the one cylinder, a second state for discharging the fluid from the one cylinder, and a third state for restricting the flow to or from the one cylinder. The first and third states are alternately established while a ratio of an operating time in the first state to that in the third state is changed, for controlling a rate of flow of the fluid into the one cylinder, and the second and third states are alternately established while a ratio of operating time in the second state to that in the third state is changed, for controlling a rate of flow of the fluid from the one cylinder, whereby the speed ratio of the transmission is continuously varied by the one cylinder under control of the speed-ratio control valve assembly.
REFERENCES:
patent: 4387608 (1983-06-01), Mohl et al.
patent: 4476746 (1984-10-01), Miki et al.
patent: 4565110 (1986-01-01), Ito
Hiramatsu Shigeki
Itoh Hiroshi
Takada Mitsuru
Tamura Tadashi
Belisario Martin G.
Staab Lawrence J.
Toyota Jidosha & Kabushiki Kaisha
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