The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 1998
Filed:
Dec. 02, 1996
Takao Naruoka, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A valve drive apparatus having a shim which is prevented from interfering with a cylinder head without decreasing abrasion resistance between the shim and a lifter contacting the shim. A three-dimensional cam includes a cam portion having a slanting cam surface inclined with respect to a rotational axis of the cam. The cam is movable along the rotational axis. The lifter transmits a force generated by a camming action of the cam to the valve. The lifter has a first surface contacting the valve and a second surface substantially opposite to the first surface. A shim is interposed between the cam and the lifter. The shim has a first surface contacting the cam and a second surface opposite to the first surface. The second surface of the shim has a convex spherical shape, and the second surface of the lifter has a concave spherical shape so as to receive the second surface of the shim.