Valve lifter

Internal-combustion engines – Poppet valve operating mechanism – Tappet

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Valve lifter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Valve lifter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve lifter will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-353600

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.