Outlet valve lifter for an internal combustion engine

Details Outlet valve lifter for an internal combustion engine Outlet valve lifter for an internal combustion engine

1992-01-29

1992-11-10

Cross, E. Rollins

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

123 9016, 123 9048, F02D 1304, F01L 114

Patent

active

051615002

ABSTRACT:
An outlet valve lifter for internal combustion engine is described. In order to increase the braking power of the internal combustion engine it is necessary that the outlet valve is opened during the compression cycle. Advantageously, this is achieved by a hydraulic outlet valve lifter which is actuated by an external pressure source. Due to the pressure of the compressed air shortly before the ignition top dead center position great forces are acting on the outlet valve and accordingly on the outlet valve lifter. These forces, in the form of hydraulic pressure, act via the inner portion of the outlet valve lifter on the external pressure source and may cause damage. Therefore, the outlet valve lifter is provided with an inner portion which is lifted by a certain stroke due to the pressure actuation via a second pressure chamber so that the outlet valve opens. When the pressure within the second pressure chamber increases as a function of the forces acting on the outlet valve and surpasses the hydraulic pressure generated by the external pressure source, a ball valve closes the second pressure chamber so that the hydraulic pressure generated therein may not be transmitted to the external pressure source.

REFERENCES:
patent: 3786792 (1974-01-01), Pelizzoni et al.
patent: 4164917 (1979-08-01), Glasson
patent: 4337739 (1982-07-01), Jordan
patent: 4399787 (1983-08-01), Cavanagh
patent: 4408580 (1983-10-01), Kosuda et al.

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