Anti-Rotation Device For Lifter

摘要

An anti-rotation guide for a lifter in an overhead valve valvetrain. The anti-rotation guide includes a plug having two lobes connected through a neck region. A first lobe of the plug is held within a bore in the lifter. The bore forms an opening at the edge of the lifter through which the neck of the plug emerges. The bore in the lifter accommodates a first lobe of the plug that is wider than the opening in the edge of the lifter, whereby the plug is shaped to prevent its slipping from the lifter through the opening. The lifter reciprocates in a first bore in the cylinder head. The second lobe of the plug extends outward from the lifter into a second bore formed in the cylinder head and adjoining the first bore. The second lobe reciprocates in the second bore and limits rotation of the lifter.

主权项

1. A valvetrain comprising:
a lifter having an axis; and an anti-rotation guide mounted to the lifter; wherein the anti-rotation guide maintains a uniform profile over a portion of its length in a direction parallel to the lifter axis; the profile includes a first region and a second region joined by a neck region; the first region is wider than the neck region; the first region is within the lifter; and the second region extends via the neck region outward from the lifter.