Valve actuating apparatus in internal combustion engine

Patent · Tue Sep 16 04:00:00 EDT 1986

OSTI ID:5352263

Yoshizaki, K; Tanahashi, T

A valve actuating apparatus is described for intake and exhaust valves in an internal combustion engine having a swing rocker arm which is rotatably connected at its one end to a rocker arm shaft and at it opposite end bears against a valve stem of an associated intake or exhaust valve, and a rotatable cam which bears against the swing rocker arm to swing the latter about the rocker arm shaft. The rocker arm is composed of a first arm which is rotatably connected to the rocker arm shaft and a second arm which bears against the valve stem and which is connected to the first arm by means of a connecting shaft extending in parallel to the rocker arm shaft, for relative rotation about the connecting shaft so that the two arms can selectively occupy an operative position in which the two arms are integral with each other and extend substantially straight so as to form a single rocker arm, and an inoperative position in which a relative rotation between the two arms takes place to absorb the rotation of the cam. The apparatus comprises locking means for preventing the relative rotation of the two arms to lock them to the operative position, unlocking means for releasing the lock at a predetermined time, and return means for continuously biasing the two arms toward the operative position to return them to the operative position when the lock is released. The locking means and unlocking means have directions of operation substantially perpendicular to and across the axis of the connecting shaft.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4611558
• OSTI ID: 5352263
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACTUATORS
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FASTENERS
FLOW REGULATORS
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL STRUCTURES
MOTION
POSITIONING
ROTATION
SHAFTS
TIME DEPENDENCE
VALVES