Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1998-11-13
2000-03-07
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9019, F01L 114, F01L 122
Patent
active
060326301
ABSTRACT:
A direct valve drive device which can open and lose a valve with accuracy even if a negative valve clearance forms between the cam and the valve stem due to a difference in thermal expansion coefficient between the cylinder head made of aluminum alloy and the iron valve. A valve lifter is mounted between the cam and the valve stem being biased toward the cam by a valve spring. An adjuster bolt is threaded into a threaded hole formed in the valve lifter. The force of a spring is applied to the adjuster bolt so that the adjuster bolt move, while rotating, toward the valve stem. Formed between the threadedly engaging portions of the adjuster bolt and the threaded hole is an axial hole which is smaller than the height of a ramp formed on the cam but large enough to absorb any difference in thermal expansion between the cylinder head and the valve. Even if the valve clearance changes toward the negative side, the axial gap absorbs such a change, thus preventing the valve from being pushed by the base circle of the cam.
REFERENCES:
patent: 3823698 (1974-07-01), Van Deberg
patent: 4321894 (1982-03-01), Black
patent: 4469057 (1984-09-01), Black
patent: 4706620 (1987-11-01), Gill
patent: 4981117 (1991-01-01), McRobert et al.
patent: 5003940 (1991-04-01), Hixson
Nozaki Takashi
Yamamoto Ken
Lo Weilun
NTN Corporation
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