초록 ▼

An anti-lash adjuster for compression relief brakes on internal-combustion engines. The anti-lash adjuster has a slave piston adapted to contact the valve-actuating mechanism for the exhaust valves. The slave piston has a predetermined surface area and a retracting spring which biases the slave pist

An anti-lash adjuster for compression relief brakes on internal-combustion engines. The anti-lash adjuster has a slave piston adapted to contact the valve-actuating mechanism for the exhaust valves. The slave piston has a predetermined surface area and a retracting spring which biases the slave piston to a retracted position. A forward bias unit is provided to assist oil under engine-oil pressure in overcoming the retracting force to bias the slave piston to an extended position. The forward bias unit only assists the engine-oil pressure in overcoming the retracting force over a limited distance. The distance may be selected to keep the exhaust valves open throughout brake operations or only to take up the lash during brake operation or to take up part of the lash. A master piston is provided to further open the valves during portions of brake operation.

대표청구항 ▼

A compression relief engine brake for internal-combustion engines, comprising: an engine having an engine oil pump, exhaust valves, and means for actuating the exhaust valves; a fluid cavity for accepting engine oil under engine oil pressure; means for supplying engine oil under normal pressure to t

A compression relief engine brake for internal-combustion engines, comprising: an engine having an engine oil pump, exhaust valves, and means for actuating the exhaust valves; a fluid cavity for accepting engine oil under engine oil pressure; means for supplying engine oil under normal pressure to the fluid cavity; a slave piston having a predetermined surface area exposed to the fluid cavity, mounted for reciprocating motion within the fluid cavity, wherein the slave piston has a retracted position defining a maximum clearance between one end of the slave piston and the exhaust valve actuating mechanism and an extended position for reducing the clearance between the end of the slave piston and the exhaust valve actuating mechanism; means for biasing the slave piston to the retracted position under a predetermined retracting force sufficient to prevent extension of the slave piston upon application of the engine oil at normal pressures to the fluid cavity; means for applying a supplemental force which does not exceed the predetermined retracting force over a limited distance to the surface of the slave piston wherein the resultant force due to the force imposed by oil pressure within the fluid cavity acting on the predetermined surface area of the slave piston and the supplemental force exceeds the predetermined retracting force so that the slave piston is biased to the extended position over the limited distance through which the supplemental force acts; and means for temporarily trapping the oil in the fluid cavity so that displacement of the slave piston in the direction of the extended position is maintained due to the incompressibility of the temporarily trapped oil.