Camshaft supporting structure in an engine

Details Camshaft supporting structure in an engine Camshaft supporting structure in an engine

1995-09-29

1997-02-25

Luong, Vinh T.

Machine element or mechanism

Elements

Cams

123 9017, 123 906, F16H 5300, F01L 1300

Patent

active

056050771

ABSTRACT:
A camshaft includes a first end journal portion and first, second and third intermediate journal portions respectively. The first end journal portion is supported in a bearing hole in an upper end wall of the cylinder head. The first, second and third intermediate journal portions are supported in three bearing holes in the three intermediate bearing bosses in the cylinder head, respectively. The radii of the four bearing holes and of a camshaft inserting opening in a lower end wall of the cylinder head are in a relationship such that the camshaft inserting opening is the largest radii, and each adjacent bearing hole is progressively smaller in size. The smallest radii bearing hole is for the bearing hole for the first end journal portion. The largest radius of an intake cam and an exhaust cam is smaller than the radii of the intermediate bearing holes. Thus, the camshaft can be smoothly inserted through the camshaft inserting opening and hence, can be easily assembled into the cylinder head.

REFERENCES:
patent: Re33783 (1992-01-01), Yoshikawa
patent: 4681069 (1987-07-01), Honma
patent: 4878462 (1989-11-01), Kurisu et al.
patent: 4915067 (1990-04-01), Imajo
patent: 5359970 (1994-11-01), Krebs
patent: 5471895 (1995-12-01), Ohmon et al.
patent: 5497679 (1996-03-01), Mitchell et al.
patent: 5497735 (1996-03-01), Kern et al.

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