JPS62143035U

JPS62143035U -

Info

Publication number: JPS62143035U
Application number: JP3238286U
Authority: JP
Priority date: 1986-03-05
Filing date: 1986-03-05
Publication date: 1987-09-09
Anticipated expiration: 2001-03-05
Also published as: JPH077544Y2

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例に係る燃焼室構
造を備えたエンジンの要部平面図、第２図は第１
図の―線断面図、第３図は第１図の―縦
断面図、第４図は第１図の―縦断面図、第５
図は本考案の第２の実施例に係る燃焼室構造を備
えたエンジンの要部平面図、第６図は第５図の
―縦断面図、第７図は従来の燃焼室構造を示す
平面図である。１……シリンダブロツク、２……シリンダヘツ
ド、３……ピストン、４……燃焼室、５……吸気
通路、６……排気通路、７……第１の吸気通路、
８……第２の吸気通路、９……第３の吸気通路、
１０……凹部（シリンダヘツド内壁）、１１……
第１の吸気ポート、１２……第２の吸気ポート、
１３……第３の吸気ポート、１４……排気ポート
、１５……第１の吸気弁、１６……第２の吸気弁
、１７……排気弁、１８……点火プラグ孔、１９
……突出部、２０……第１の周壁面、２１……第
２の周壁面。 FIG. 1 is a plan view of essential parts of an engine equipped with a combustion chamber structure according to a first embodiment of the present invention, and FIG.
Fig. 3 is a vertical sectional view of Fig. 1, Fig. 4 is a vertical sectional view of Fig. 1, Fig. 5 is a longitudinal sectional view of Fig.
The figure is a plan view of essential parts of an engine equipped with a combustion chamber structure according to the second embodiment of the present invention, FIG. 6 is a vertical sectional view of FIG. 5, and FIG. 7 is a plane view showing a conventional combustion chamber structure. It is a diagram. DESCRIPTION OF SYMBOLS 1... Cylinder block, 2... Cylinder head, 3... Piston, 4... Combustion chamber, 5... Intake passage, 6... Exhaust passage, 7... First intake passage,
8... Second intake passage, 9... Third intake passage,
10... recess (inner wall of cylinder head), 11...
first intake port, 12... second intake port,
13... Third intake port, 14... Exhaust port, 15... First intake valve, 16... Second intake valve, 17... Exhaust valve, 18... Spark plug hole, 19
... protrusion, 20 ... first peripheral wall surface, 21 ... second peripheral wall surface.

Claims

[Scope of utility model registration request]

A combustion chamber is formed between the upper surface of the piston and the inner wall of the cylinder head facing the upper surface of the piston, and a first intake port and a second intake port are provided on one side of the combustion chamber to be opened and closed by a first intake valve. A second intake port, which is opened and closed by an intake valve, is opened and spaced apart from each other in a direction substantially perpendicular to the direction of intake air introduction, while the first intake port and the second intake port are opened on the other side of the combustion chamber. In the engine, a spark plug is disposed at a position facing the second intake port, and an exhaust port opened and closed by an exhaust valve is opened at a position facing the second intake port.
between the intake port and the exhaust port, an external tangent that commonly touches the periphery of the combustion chamber, the outer periphery of the second intake valve, and the outer periphery of the exhaust valve on the combustion chamber periphery side, respectively; A protrusion is provided that protrudes into the combustion chamber within a range surrounded by The part facing the intake valve of the second
A first circumferential wall surface substantially parallel to the valve lift direction of the intake valve, and a second circumferential wall surface substantially parallel to the cylinder axis direction facing the exhaust valve; A combustion chamber structure for an engine, characterized in that the wall surface shape of the second peripheral wall surface is a concave curved surface that curves smoothly toward the intersection of both.