Device for varying a valve timing and lift for an internal combustion engine

Patent · Tue Sep 29 00:00:00 EDT 1987

OSTI ID:5819977

Nohira, H

A device for varying valve timing and lift is described comprising: a first valve lifter movable along an axis and adapted to contact a valve; a second valve lifter, adapted to contact a cam, movable along the axis. The first and second valve lifters define a pressure chamber therebetween; first means for providing a pressure in the pressure chamber. A sole source of pressure to the pressure chamber is by supplying oil to an inlet portion of the pressure chamber; and second means, coupled to an outlet portion different from the inlet portion, of the pressure chamber, for selectively relieving pressure in the pressure chamber; and high speed actuator means for controlling the pressure relieving of the second means, including: check ball valve means for selectively blocking the second means, and actuator means for directly opening the check ball valve means, the check ball valve means disposed so that pressure of the oil closes the check ball valve means. A method of controlling a valve is described comprising the steps of: transferring motion from a cam to a first valve lifter; transferring motion from a second valve lifter to the valve; controlling the volume of a pressure chamber defined between the first and second valve lifters which has independent inlet and outlet paths, by supplying a pressurized oil into the pressure chamber, through the inlet path and selectively commanding a check ball valve in the outlet path to open against the oil pressure. The check ball valve is disposed so that the oil pressure would normally close the check ball valve; selectively opening the check ball valve by transmitting force from an actuator to the check ball valve; using only the oil pressure as controlled by the check ball valve to apply a force to the second valve lifter.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4696265
• OSTI ID: 5819977
• Resource Relation: Patent File Date: Filed date 26 Dec 1985
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
INTERNAL COMBUSTION ENGINES
PRESSURE CONTROL
VALVES
ACTUATORS
TIMING PROPERTIES
CONTROL EQUIPMENT
DESIGN
DUCTS
OILS
OPERATION
WORKING FLUIDS
CONTROL
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUIDS
HEAT ENGINES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
330100* - Internal Combustion Engines