Tappet and shim assembly for internal combustion engine

Details Tappet and shim assembly for internal combustion engine Tappet and shim assembly for internal combustion engine

1994-12-09

1995-08-29

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9051, 74569, F01L 116

Patent

active

054451191

ABSTRACT:
A tappet and shim assembly is disclosed for operating directly between a valve and a camshaft lobe in an internal combustion engine. The assembly comprises a tappet having a shallow cylindrical recess in one end that is concentric with an outer cylindrical surface of the tappet. A dual-diameter cylindrical shim is provided with concentric small and large diameter cylindrical portions wherein the large cylindrical portion has a diameter that is sufficiently large so that a flat end surface thereof contacts with a lobe of a camshaft without the lobe contacting the edge of this surface. The small diameter portion of the shim is received in the recess of the tappet and the diameter of the outer cylindrical surface of the latter is made just slightly larger than that of the large diameter portion of the shim so that the latter is received with clearance in the bore in which the tappet is received. The small diameter portion of the shim is provided with an axial dimension such that when it is bottomed out in the recess in the tappet, the large diameter portion of the shim is located at a distance from the tappet to form an annular space therebetween for insertion of a sharp tipped tool to remove the shim from the tappet.

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