Exhaust gas purifying device for an outboard motor
a technology for exhaust gas purification and outboard motors, which is applied in the direction of machines/engines, marine propulsion, vessel construction, etc., can solve the problems of reducing engine performance and extremely cumbersome exhaust gas treatment systems
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first embodiment
Referring now additionally to FIGS. 2 through 4 the exhaust gas purifying arrangement in accordance with the invention will be described.
As shown in FIG. 4, three exhaust ports, indicated generally by the reference numeral 40, are positioned by each of three cylinders, indicated by the reference numeral 42, located within the cylinder block 39 of the engine 6. The timings at the three exhaust ports 40 are set to differ by 120 degrees from each other. This makes it possible to utilize the pulsation effect of the exhaust to ensure the desired level of engine performance.
The three exhaust ports 40 open into a single exhaust gas conduit 44 located within a spacer plate 46. The spacer plate 46 is positioned immediately below the cylinder block 39. The spacer plate 46 further accommodates a cooling water jacket 41 in conjunction with the cylinder block 39 of the engine 6. The conduit 44 leads downwardly to a vertically disposed first exhaust passage 48 comprised of an exhaust pipe 49 and ...
second embodiment
FIGS. 5 and 6 show the invention. Exhaust gases initially flow downwardly, from the gas conduit 44, through the first exhaust passage 48, which is at least partially lined with a first catalyst 52. Upon exiting the first exhaust passage 48 the exhaust gases enter an expansion chamber 54. After passing into the expansion chamber 54 the exhaust gases turn upwardly and flow in an upward direction. Positioned above the expansion chamber 54, and held in place by fixture members 60, is a second catalyst member 62. The second catalyst member 62 is located between a muffler 56 and an integrally formed dividing barricade 57. The second catalyst member 62 extends across the entire flow path of the exhaust gases, so that all of the gases must pass through the catalyst during their upward flow.
Just above the second catalyst member 62 the second exhaust passage 58 begins. Along the upper portion of the second exhaust passage 58 a concave region 100 is formed within the spacer plate 46. The exhau...
third embodiment
FIGS. 7 and 8 show the invention. Exhaust gases initially flow downwardly, from the gas conduit 44, through the first exhaust passage 48, which is at least partially lined with a first catalyst 52. Upon exiting the first exhaust passage 48 the exhaust gases enter an expansion chamber 54. After passing into the expansion chamber 54 the exhaust gases turn upwardly and flow in an upward direction. At an upper region of the expansion chamber 54 and just beneath a concave portion 100 of the spacer plate 46, an opening 110 is located which forms the beginning of the second exhaust passage 58.
Fastened in place along a lower side of the spacer plate 46 is a second catalyst member 62. The second catalyst member 62 extends horizontally across the entire flow path of the exhaust gases, so that all of the gases must pass through the catalyst during their upward flow. The second catalyst member 62 is surrounded by a sleeve 114 member which is, in turn, nested within a semi-cylindrical portion 11...
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