SUB-CHAMBER COMBUSTION FOUR-STROKE ENGINE

Title:

SUB-CHAMBER COMBUSTION FOUR-STROKE ENGINE

Document Type and Number:

WIPO Patent Application WO/2023/157050

Kind Code:

A1

Abstract:

A sub-chamber combustion four-stroke engine (1) includes a sub-chamber (20) that is in communication with a main combustion chamber (2) via a plurality of communication holes (21) and has an inner space into which a part of a sub-chamber spark plug (23) is exposed and a suction path jetting valve (8) that jets fuel to the suction path (5), and does not include an ignition assist device that assists ignition of air-fuel mixture. The length of the larger one of a length (L1) in a plug axial direction (DP) of the inner space of the sub-chamber and a maximum length (L2) in a direction orthogonal to the plug axial direction of the inner space of the sub-chamber is smaller than twice the length of the smaller one thereof. When seen in the plug axial direction, an angle θ formed by a line segment (LSa) connecting a central axis line (C23) of the sub-chamber spark plug and a center (C3a) of the suction port with respect to a central axis line (C21ia) of a first suction hole (21ia) that is any one of the plurality of communication holes (21) satisfies -17° <θ < 17°. In a cross section cut off by a plane including the central axis line of the first suction hole in parallel with a central axis line (C11) of a cylinder hole (11), the central axis line of the first suction hole passes through between the first suction port and a valve head (14) of the suction valve during opening of the suction valve (13) that opens/closes the first suction port.

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Inventors:

EGASHIRA SHUICHI (JP)

Application Number:

PCT/JP2022/005817

Publication Date:

August 24, 2023

Filing Date:

February 15, 2022

Export Citation:

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Assignee:

YAMAHA MOTOR CO LTD (JP)

International Classes:

F02B19/12

Foreign References:

JP2022017967A	2022-01-26
US10612454B2	2020-04-07
JP2007113535A	2007-05-10

Attorney, Agent or Firm:

ATEN IP ATTORNEYS (JP)

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