Control system for an infinitely variable transmission

Patent · Tue Apr 14 00:00:00 EDT 1987

OSTI ID:6765974

Miyawaki, M

This patent describes a control system for an infinitely variable transmission for transmitting the power of an internal combustion engine mounted on a vehicle. The transmission comprises: a primary pulley operatively connected to a crankshaft of the engine having a hydraulically shiftable disc and a first hydraulic cylinder for shifting the disc; a secondary pulley operatively connected to an output shaft and having a hydraulically shiftable disc and a second hydraulic cylinder for operating the disc of the secondary pulley; a belt engaged with both pulleys; a first hydraulic circuit having a pump for supplying oil; a transmission ratio control valve responsive to engine speed for controlling the oil so as to shift the disc of the primary pulley to change the transmission ratio; and a pressure regulator valve responsive to the transmission ratio for increasing line pressure of the hydraulic circuit with an increase of the transmission ratio. The improvement is described comprising: means comprising a piston axially slidably mounted in the first hydraulic cylinder of the primary pulley defining a piston chamber in the first hydraulic cylinder. The means is included for restricting shifting of the disc of the primary pulley to a maximum transmission ratio of the transmission so as to limit movement of the disc of the primary pulley at a restricted position where the transmission ratio is lower than the maximum transmission ratio of the transmission; and a second hydraulic circuit provided between the pump and the piston chamber.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4656892
• OSTI ID: 6765974
• Resource Relation: Patent File Date: Filed date 30 Nov 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
MECHANICAL TRANSMISSIONS
CONTROL SYSTEMS
VEHICLES
HYDRAULIC CONTROL DEVICES
INTERNAL COMBUSTION ENGINES
LUBRICATING OILS
PISTONS
PUMPS
SHAFTS
VALVES
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
LUBRICANTS
MACHINE PARTS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
330602* - Vehicle Design Factors- Engine-Transmission Matching