초록 ▼

Method and apparatus for suspending valve actuation for use in an internal combustion engine is disclosed. Each of intake and exhaust valves is normally actuated by a rocker arm operated by a cam in synchronism with an engine operation. The rocker arm is supported at one end by a supporting member h

Method and apparatus for suspending valve actuation for use in an internal combustion engine is disclosed. Each of intake and exhaust valves is normally actuated by a rocker arm operated by a cam in synchronism with an engine operation. The rocker arm is supported at one end by a supporting member held to a cylinder head by means of a retaining member. The supporting member is selectively floatable with respect to the cylinder head to thereby effect suspension of valve operation. The supporting member is then held at a position where sliding contact between the rocker arm and the cam is prevented.

대표청구항 ▼

In a valve actuating method with a function for suspending valve operation in an internal combustion engine, wherein each of intake and exhaust valves is actuated by a rocker arm operated in response to the rotation of valve actuating cam in synchronism with the engine operation, said rocker arm bei

In a valve actuating method with a function for suspending valve operation in an internal combustion engine, wherein each of intake and exhaust valves is actuated by a rocker arm operated in response to the rotation of valve actuating cam in synchronism with the engine operation, said rocker arm being supported at its one end in a rigid manner by a supporting member retained by a cylinder head of said engine through a retaining member, the retention of said supporting member by said retaining member is selectively dismissed to nullify said supporting reactional force for said rocker arm to permit said supporting member to float to thereby effect suspension of operation of said valve, an improvement comprising the steps of; releasing the retention of said supporting member by said retaining member to permit said supporting member to float with respect to said cylinder head during valve suspension, and holding said supporting member at a position where sliding contact between said rocker arm and said valve actuating cam is prevented. In a valve actuating mechanism having a valve operation suspending function, including a rocker arm for actuating an intake or exhaust valve in accordance with the rotation of a cam operated in synchronism with the engine rotation, and a supporting member adapted to support one end of said rocker arm, said supporting member being provided at a cylinder head through a retaining member, the retention of said supporting member by said retaining member being selectively dismissed to nullify the supporting reactional force for said rocker arm to make said supporting member float to thereby effect a suspension of operation of said valve, the improvement comprising: said rocker arm formed with a curved surface at its upper end at a position adjacent to a fulcrum point thereof, and a control arm disposed above said supporting member and biased by a resilient member in a direction of curving of said curved surface so as to be able to move onto said curved surface during the suspension of operation of said valve; said curved surface being formed to intersect the locus of rotation of an end of said control arm such that the end of said rocker arm adjacent to the fulcrum is located outside said locus when said valve is fully opened.