Camshaft structure for double overhead camshaft engine

Details Camshaft structure for double overhead camshaft engine Camshaft structure for double overhead camshaft engine

1989-11-29

1990-09-18

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 9027, 123196M, 184 65, F01M 910

Patent

active

049570790

ABSTRACT:
An overhead camshaft structure for a double overhead camshaft engine having at least three in-line cylinders and two camshafts which are formed with series of pairs of cam lobes and series of camshaft journals, respectively, and are operatively connected with each other by helical gears comprises a thrust collar formed on each camshaft, a thrust bearing formed with a thrust restrictive groove consisting of an upper half and a lower half, narrower than the upper half, for receiving therein the thrust collar, and an oil passage consisting of a radial passage portion penetrating through the thrust collar and an axial passage portion formed in each camshaft for allowing oil to pass up to each cam lobe and camshaft journal for lubrication. The radial passage is directed in parallel with a straight line connecting an axial centerline of rotation of each said camshaft and a juncture of a valve opening ramp of said cam lobe adjacent to said thrust collar.

REFERENCES:
patent: 4441465 (1984-04-01), Nakamura
patent: 4537166 (1985-08-01), Kimura et al.
patent: 4553510 (1985-11-01), Yano et al.
patent: 4632073 (1986-12-01), Futakuchi
patent: 4658769 (1987-04-01), Horio et al.
patent: 4754729 (1988-07-01), Abe et al.
patent: 4777842 (1988-10-01), Yamada
patent: 4840149 (1989-06-01), Fujita

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