Cam Follower and Lifter Arrangements of a Valve Train of an Internal Combustion Engine
Publication Date: 2016-Sep-09
The IP.com Prior Art Database
Page 01 of 4
Title: Cam Follower and Lifter Arrangements of a Valve Train of an Internal Combustion Engine
As shown in the attached illustrations and described below, various cam follower and lifter arrangements of a valve train of an internal combustion engine, are disclosed.
Rollerball Lifter Design
Figures 1 illustrates a front view a roller follower arranged with a valve lifter of a valve train of an internal combustion engine.
Figure 2 illustrates a side view of the roller follower arrangement of Figure 1.
The concept is to replace the cylindrical roller of a prior art roller tappet with a large single rollerball. The ball tracks in a slightly indented groove in the camshaft surface. The ball is shown slightly offset from the centerline of the lifter bore in order to add a caster effect for alignment and lifter rotation within the lifter bore. This offset may also provide for compensation for situations when the camshaft moves slightly back and forth axially within the block bore as engine speed changes. It is also conceivable that the ball is not offset from the lifter bore centerline.
The Rollerball is lubricated by oil drain back from cylinder head cavity thru the lifter hole. Lubricating oil may also be used to reduce friction in contact zones and also to reduce any galling tendency. Lubrication openings, pathways and drain back areas may be arranged in a number of ways.
Floating Head Follower
Figure 3 is a sectional side view of a first example arrangement of a lifter body and cam follower of a valve train of an internal combustion engine.
The concept is a flat cam follower with a hardened steel cam follower face that is free to rotate. The cam face is most typically flat to slight...