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Example of a Finger follower design with a compound (2 radii) pad (back)

This is the in-software information picture which accompanies the input data fields for the geometry of the "type 2" finger follower. Note that the cam follower pad has two radii where the confluence point of the two radii can be offset by an angle Ocf. For the sequence of pictures below, all input data is common except for the numerical value of Ocf. (back)

 

This shows two snapshots from the on-screen movie of the cam profile design and the lifting of the valve when Ocf is -5 degrees. (back)

 

This shows two snapshots from the on-screen movie of the cam profile design and the lifting of the valve when Ocf is +5 degrees (back)

          

 

This shows the cam profile designs when Ocf is -5, 0, and +5 degrees. The movie snapshot is taken before the commencement of valve lift and where the tappet is set clear due to the input data valve lash. It is now obvious that the cam profile design is a function of this offset angle Ocf with consequential shifts in Hertz stress, oil film thickness, radius of curvature, etc., all of which are computed by the 4stHEAD software (back)

 

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