JPH0452519U

JPH0452519U -

Info

Publication number: JPH0452519U
Application number: JP9577190U
Authority: JP
Priority date: 1990-09-11
Filing date: 1990-09-11
Publication date: 1992-05-06
Anticipated expiration: 2005-02-08
Also published as: JPH075219Y2

Description

[Brief explanation of the drawing]

第１図は本考案を適用したジエツト推進式小型
舟艇の全体概略断面図、第２，３図はそのエンジ
ンの排気マフラーを抽出して示す側面図と正面図
、第４，５図は第２図の４−４線と５−５線に沿
う各断面図、第６図は第３図の６−６線断面図、
第７，８図は本考案の第１，２変形例を示す各断
面模式図、第９図は同じく第３変形例を示す側断
面図、第１０，１１図は本考案の接続使用状態を
２種示す各説明図、第１２図は第１１図に対応す
る従来品の側断面図である。２３……外筒、２４，２５……カバー板、２６
……導入口筒、２７……導出口筒、２８……内筒
、２９……小孔、３０……吸音材、３１，３２，
３３……リード溝、３４……冷却水導入口筒、０
−０……長手中心線。 Figure 1 is an overall schematic sectional view of a small jet propulsion watercraft to which the present invention is applied, Figures 2 and 3 are side and front views showing the exhaust muffler of the engine, and Figures 4 and 5 are Each sectional view taken along lines 4-4 and 5-5 in the figure, Figure 6 is a sectional view taken along line 6-6 in Figure 3,
Figures 7 and 8 are schematic cross-sectional views showing the first and second modifications of the present invention, Figure 9 is a side sectional view showing the third modification, and Figures 10 and 11 are diagrams showing the connection and use of the invention. Two types of explanatory drawings are shown, and FIG. 12 is a side sectional view of a conventional product corresponding to FIG. 11. 23... Outer cylinder, 24, 25... Cover plate, 26
...Inlet tube, 27...Outlet tube, 28...Inner tube, 29...Small hole, 30...Sound absorbing material, 31, 32,
33...Lead groove, 34...Cooling water inlet pipe, 0
-0...Longitudinal center line.

Claims

[Claims for Utility Model Registration] 1. An outer cylinder of a certain length that forms an expansion chamber for exhaust gas 2.
3, a pair of front and rear cover plates 24, 25 that cover both ends of the opening of the outer cylinder 23, and an exhaust gas inlet that integrally projects from the center of the opening of each of the cover plates 24, 25 in opposite directions. Tube 2
6 and the outlet tube 27, and the longitudinal centerline 0-0 of the outer tube 23 in order to connect the inlet tube 26 and the outlet tube 27 in a direct state.
An inner cylinder 28 that is fitted and integrated on the top and has a large number of small holes 29 dotted on its circumferential surface, and an inner and outer gap where the outer peripheral surface of the inner cylinder 28 and the inner peripheral surface of the outer cylinder 23 face each other. Sound absorbing material 30 filled with
It is characterized in that the inner peripheral surface of the inner cylinder 28 is provided with a large number of lead grooves 31 for generating a vortex flow of exhaust gas in a spiral spiral state that twists in one direction overall. engine exhaust muffler. 2 Lead grooves 3 provided on the inner circumferential surface of the inner tube 28 on the inner circumferential surface of the inlet tube 26 and/or the outlet tube 27
2. The exhaust muffler for an engine according to claim 1, further comprising lead grooves (32, 33) substantially parallel to the lead grooves (32, 33). 3. The engine exhaust muffler according to claim 1, wherein a cooling water inlet tube 34 for cooling the engine is connected to the upper circumferential surface of the outer tube 23 for communication.