Squeeze film rocker tip

Details Squeeze film rocker tip Squeeze film rocker tip

1983-06-09

1986-05-20

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 9046, F01L 146

Patent

active

045893837

ABSTRACT:
Side loads on the valve guide due to rocker tip sliding can be essentially eliminated with a rocker tip which maintains a squeeze film of oil between the valve tip and the rocker tip. This squeeze film of oil between rocker tip and valve tip can be arranged with a special rocker tip involving a spherical lubricated support, a flat section engaging the flat plane of the valve tip spring, means to produce a clearance between the rocker tip and the valve tip during the periods when the valve is closed, and lubricant supply means to assure that oil is present between the rocker tip and the valve tip to replenish the film when the valve is closed. During the closed or unloaded period, a film of oil is established between the rocker tip and valve guide. This oil film is not completely squeezed out when the valve is actuated due to the squeeze film effect. Because of the full film of oil between the valve tip and the rocker tip, the friction side force produced by the rocker tip actuation is radically reduced.

REFERENCES:
patent: 1515201 (1924-11-01), Hewitt
patent: 1930368 (1933-10-01), Nelson
patent: 2000635 (1935-05-01), Edwards
patent: 2158272 (1939-05-01), Chilton
patent: 2322173 (1943-06-01), Spencer
patent: 3016887 (1962-01-01), Streit et al.
patent: 3855981 (1974-12-01), Loon

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