JPS61173716U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view illustrating an embodiment of the exhaust manifold for a multi-cylinder engine according to the present invention;
The figure is a perspective view, FIG. 3 is a front view, FIG. 4 is a front view showing the exhaust passage of the exhaust manifold with dotted lines, and FIG. 5 is a longitudinal side view taken along the line - in FIG. Figure 6 is a cross-sectional horizontal plan cut along the - line of Figure 4, and Figure 7 is a - of Figure 5.
8 is a cross-sectional horizontal plan view taken along the line --- in FIG. 4, respectively. 1... Cylinder block, 2... Cylinder, 3... Cylinder head, 4... Exhaust port, 5... Exhaust port, 6
...exhaust valve, 7...downstream end opening, 10...exhaust manifold, 11...exhaust passage, 12...branch part, 13...collecting part, 14...coupling part, 15...upper flange, 1
6...Bolt hole, 17...Bolt, 18...Rack, 1
9...Boss, 20...Stay.

Claims (1)

[Scope of utility model registration request] The upstream end of each branch passage of the exhaust manifold is communicated with the exhaust port of each cylinder of a multi-cylinder engine in which three or more cylinders are arranged in series, and the downstream ends of the branch passages on both sides among the three or more branch passages are are located approximately at the center of the arrangement position of the exhaust ports and are gathered together, and the downstream end of the central branch passage sandwiched between the both-side branch passages and the downstream end of the both-side branch passages are connected to the arrangement of the branch portions. In the exhaust manifold for a multi-cylinder engine, which is formed by stacking and gathering along a plane perpendicular to the direction, the wall thickness of the central branch passage is thicker than the wall thickness of the branch passages on both sides of the exhaust passage. cylinder engine exhaust manifold.