Title:
SPARK IGNITION TYPE TWO-CYCLE VALVE ENGINE, ENGINE UNIT, AND VEHICLE
Document Type and Number:
Japanese Patent JP2021167573
Kind Code:
A
Abstract:
To provide a spark ignition type two-cycle valve engine capable of improving heat efficiency.SOLUTION: A spark ignition type two-cycle valve engine is equipped with a piston portion, a crank shaft, only one exhaust port, only one single center tumble port, an offset ignition plug, and a small-diameter long stroke cylinder that defines a combustion chamber together with the piston portion. The combustion chamber has a diameter shorter than a reciprocating stroke of the piston portion when viewed from a reciprocating direction, and is formed to generate a tumble flow in a gas sucked from the single center tumble port when the piston portion moves toward a bottom dead point by the stoke longer than the diameter of the combustion chamber when viewed in the reciprocating direction, and to direct the gas pushed by the piston portion toward a suction port when the piston portion moves toward an upper dead point by the stroke longer than the diameter.SELECTED DRAWING: Figure 1
Inventors:
NAGAI YOSHITAKU
TANOKURA HAYATO
TANOKURA HAYATO
Application Number:
JP2018132366A
Publication Date:
October 21, 2021
Filing Date:
July 12, 2018
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD
International Classes:
F02B23/08; F02D9/02; F02D9/08; F02D9/10; F02F1/42
Attorney, Agent or Firm:
Patent Service Corporation Tas Meister