| 摘要 |
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.
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