Control device of an infinitely variable transmission
An automatic control system is described for a toric type infinitely variable transmission of a running vehicle, the speed of which is changed by varying a gear ratio corresponding to a running mode of the vehicle selected by a driver. The transmission comprises coaxially disposed input and output shafts with input and output disks having toroidal surfaces and respectively secured to the input and output shafts, a traction roller engaged with the toroidal surfaces of the disks, and a trunnion rotatably supporting the traction roller on a rotary shaft. The trunnion is linearly movable in the direction of a pivot axis which is perpendicular to the rotary shaft of the traction roller and is pivotable around the pivot axis so that the gear ratio between the input shaft and the output shaft may be changed. The control system comprises: a hydraulic cylinder receiving an axial end of the trunnion; and a hydraulic circuit connecting the hydraulic cylinder with a hydraulic source, the hydraulic circuit including a solenoid valve. The valve has means for repeatedly opening and closing the valve at predetermined intervals and controlling hydraulic supply to the hydraulic cylinder and thereby controlling the linear movement of the trunnion in the direction of the pivot axis so as to vary the gear ratio.
- Assignee:
- Nippon Seiko Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4638691
- OSTI ID:
- 6874706
- Country of Publication:
- United States
- Language:
- English
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Multimode infinitely variable transmission
Infinitely variable ratio transmission
Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
GEARS
HYDRAULIC CONTROL DEVICES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
SHAFTS
SIGNALS
SOLENOIDS
SPEED REGULATORS
VEHICLES
VELOCITY