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详情
A device that eliminates the need for mechanical clearance in the
valve train of internal combustion engines. Clearance is normally
required to prevent the valve's being held open and destroyed as
the valve train undergoes thermal expansion. However, clearance
requires frequent adjustment and is responsible for much operating
noise. The hydraulic lifter is a telescoping compression strut in
the linkage between cam and valve, consisting of a piston and
cylinder . When no opening load exists, a weak spring moves
the piston, extending the strut and eliminating any clearance. This
action sucks oil into the cylinder past a check valve. The trapped
oil transmits the valve-opening forces with little deflection. A
slight leakage of oil during lift shortens the strut, assuring
valve closure. The leakage oil is replaced as the spring again
extends the strut at no load. It is suitable for mazda.
