JPH0479949U

JPH0479949U -

Info

Publication number: JPH0479949U
Application number: JP12407990U
Authority: JP
Priority date: 1990-11-26
Filing date: 1990-11-26
Publication date: 1992-07-13

Description

[Brief explanation of the drawing]

第１図および第２図は本考案の第１の実施例を
示し、第１図はシリンダヘツド等を示す縦断面図
、第２図は排気ポートライナの斜視図、第３図は
第２の実施例を示す排気ポートライナの斜視図、
第４図は第３の実施例を示す排気ポートライナの
斜視図、第５図は第４の実施例を示す排気ポート
ライナの斜視図、第６図ないし第８図は従来技術
を示し、第６図は４バルブエンジンの要部縦断面
図、第７図は排気ポートライナの外観図、第８図
は第７図中の矢示−方向断面図である。２……シリンダ、６……燃焼室、７……ピスト
ン、９……吸気弁、１０，１３……ブツシユ、１
１，１４……弁座、１２……排気弁、２１……シ
リンダヘツド、２２……吸気ポート、２３……排
気ポート、２３Ａ……ポート部、２３Ｂ……二又
部、２３Ｃ……合流部、２４，３１，４１，５１
……排気ポートライナ。 1 and 2 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing the cylinder head etc., FIG. 2 is a perspective view of the exhaust port liner, and FIG. 3 is a second embodiment of the invention. A perspective view of an exhaust port liner showing an example,
FIG. 4 is a perspective view of an exhaust port liner showing a third embodiment, FIG. 5 is a perspective view of an exhaust port liner showing a fourth embodiment, FIGS. 6 to 8 show the prior art, and FIG. 6 is a longitudinal sectional view of the main parts of a four-valve engine, FIG. 7 is an external view of an exhaust port liner, and FIG. 8 is a sectional view taken in the direction indicated by the arrow in FIG. 7. 2... Cylinder, 6... Combustion chamber, 7... Piston, 9... Intake valve, 10, 13... Bush, 1
1, 14... Valve seat, 12... Exhaust valve, 21... Cylinder head, 22... Intake port, 23... Exhaust port, 23A... Port section, 23B... Forked section, 23C... Merging section , 24, 31, 41, 51
...Exhaust port liner.

Claims

[Scope of utility model registration request]

A combustion chamber is defined between a cylinder, a cylinder head that is mounted on the cylinder and is formed with an intake port and an exhaust port that communicate with the inside of the cylinder, and that moves reciprocally within the cylinder and defines a combustion chamber between each cylinder head. an intake valve provided in the cylinder head to open and close the intake port to the combustion chamber; and an intake valve provided in the cylinder head to open and close the intake port to the combustion chamber.
An engine equipped with an exhaust valve that discharges exhaust gas from the combustion chamber into an exhaust port,
The exhaust port of the cylinder head is provided with an exhaust port liner made of a ceramic material having heat insulating properties and partially covering the peripheral wall of the exhaust port at a position in direct contact with the exhaust gas from the combustion chamber. An engine with an exhaust port liner that is characterized by being integrally molded.