Title:
VALVE SYSTEM ON TWO-STROKE ENGINE
Document Type and Number:
Japanese Patent JPH0364604
Kind Code:
A
Abstract:
PURPOSE:To reduce the thermal load of exhaust valves by constructing cams to open exhaust valves so as to have two cam noses in which the phase of the larger cam nose of at least one of the cams and that of the smaller cam nose of at least one of the other cams are nearly same. CONSTITUTION:Poppet exhaust valves 14a, 14b to open and close the two exhaust ports 15 provided in a cylinder head 14 are opened and closed by the rotation of a camshaft 20, arranged above the valve lifters (tappets) 6 inserted freely in the end portions of the shafts of valves 14a, 14b, through the 1st. and the 2nd cams 18, 19 respectively. In the above, the 1st. and the 2nd cams 18, 19 are provided with the 1st. cam noses 18a, 19a of larger profile and the 2nd cam noses 18b, 19b of smaller profile 180 deg. phase shifted to cam noses 18a, 19a in circumferential direction respectively, and the phases of the nose 18a and the nose 19a and those of the nose 18b and the nose 19b are made 180 deg. different to each other respectively.
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Inventors:
SHIDA TOSHIMITSU
Application Number:
JP19805889A
Publication Date:
March 20, 1991
Filing Date:
August 01, 1989
Export Citation:
Assignee:
FUJI VALVE
International Classes:
F01L1/38; F01L13/00; F02B75/02; (IPC1-7): F01L1/38; F01L13/00
Domestic Patent References:
| JPS4715509A | ||||
| JP2126033B |
Attorney, Agent or Firm:
Soichi Takezawa
Next Patent: JPH0364605