Patent application number | Description | Published |
20100003873 | OUTBOARD MOTOR - An outboard motor includes an engine and an exhaust pipe. The engine has a crank case, a cylinder body, and a cylinder head aligned along the front-rear direction of the outboard motor, and arranged to support a crankshaft so as to extend along an up-down direction. The exhaust pipe is arranged to lead an exhaust gas of the engine to a main exhaust passage positioned below the engine. The cylinder head has an exhaust gas outlet opened in the side portion on one side of the cylinder head in the left-right direction of the outboard motor. The exhaust pipe has a bypass exhaust pipe which, in a plan view, extends from the exhaust gas outlet, bypasses the engine along the crank case, and reaches the other side in the left-right direction of the engine. | 01-07-2010 |
20100022148 | EXHAUST DEVICE FOR OUTBOARD MOTOR MULTI-CYLINDER ENGINE - An exhaust device for an outboard motor multi-cylinder engine includes an exhaust passage having a first end connected to the multi-cylinder engine, a catalyst provided in the exhaust passage, and an exhaust chamber connected to a second end of the exhaust passage as well as to a main exhaust passage positioned below the engine. The exhaust passage includes upstream portions for cylinders which have inlet ends respectively connected to exhaust gas outlets of a plurality of cylinders whose exhaust valve opening periods are different, a collecting portion arranged to connect the outlet ends of these upstream portions to each other, and a plurality of downstream portions which are branched from the collecting portion and connected commonly to the exhaust chamber. The catalyst is provided in each of the plurality of downstream portions. | 01-28-2010 |
20100056001 | EXHAUST DEVICE FOR OUTBOARD MOTOR ENGINE AND OUTBOARD MOTOR - An exhaust device for an outboard motor engine includes an exhaust passage, a catalyst an air inlet, and an air pump. The exhaust passage is connected to the engine arranged to support a crankshaft extending along an up-down direction. The catalyst is arranged in the exhaust passage. The air inlet is arranged at a position higher than the engine inside an engine cover covering the engine. The air pump is supported by the engine. Further, the air pump is arranged to supply air taken through the air inlet to an upstream side of the catalyst in the exhaust passage. | 03-04-2010 |
20100056002 | OUTBOARD MOTOR - An outboard motor includes an engine, a first exhaust passage, a partition, a communication portion, an exhaust gas concentration sensor, and a catalyst. The engine is arranged to support a crankshaft extending along an up-down direction. The first exhaust passage is connected to the engine and is arranged to exhaust exhaust gas of the engine into water. The partition is arranged to partition an inside of the first exhaust passage into an upstream side and a downstream side. The communication portion is arranged to make the upstream side communicate with the downstream side of the partition in the first exhaust passage. The exhaust gas concentration sensor is arranged on the upstream side of the partition in the first exhaust passage. The catalyst is arranged on an upstream side of the exhaust gas concentration sensor in the first exhaust passage. | 03-04-2010 |
20100059008 | OUTBOARD MOTOR - An outboard motor includes an engine, an engine cover, a partitioning member, an intake device, and a fan. The engine is arranged to support a crankshaft extending along an up-down direction. The partitioning member is arranged to partition the inside of the engine cover into a lower chamber accommodating the engine and an upper chamber. In the partitioning member, a communication hole which is arranged to cause the upper chamber to communicate with the lower chamber is provided. Also, the engine cover has an air inlet arranged to cause the upper chamber to communicate with the atmosphere, and an air outlet arranged to cause the lower chamber to communicate with the atmosphere. The air inlet is arranged in an upper portion of the engine cover. The air outlet is arranged at a lower end portion of the engine cover. The intake device is connected to the engine. The intake device has an air suction port arranged to communicate with the upper chamber. The fan is arranged inside the engine cover. The fan is arranged to send air inside the upper chamber into the lower chamber through the communication hole. | 03-11-2010 |
20100068952 | OUTBOARD MOTOR - An outboard motor that is capable of reducing a trolling noise includes an engine which has a crank shaft extending in an up-down direction; a drive shaft extending downward from the crank shaft and including a torsion bar spring; a propeller shaft; a propeller provided in the propeller shaft; a forward/backward switching mechanism arranged to connect the drive shaft and the propeller shaft with each other; and a vibration damper which includes a first cylindrical body and a second cylindrical body which are penetrated by the torsion bar spring. The first cylindrical body and the second cylindrical body are coaxial with each other. The first cylindrical body has its upper end portion connected with an upper end portion of the torsion bar spring whereas the second cylindrical body has its lower end portion connected with a lower end portion of the torsion bar spring. A viscous fluid is filled between the first cylindrical body and the second cylindrical body. | 03-18-2010 |
20100180583 | INTERNAL COMBUSTION ENGINE, VEHICLE, MARINE VESSEL, AND EXHAUSTING METHOD FOR INTERNAL COMBUSTION ENGINE - An internal combustion engine includes a structure that increases the velocity of exhaust gas. The internal combustion engine includes a branch section arranged to branch a shock wave propagating at a higher velocity than exhaust gas and to guide the branched shock wave, and a reflecting section provided in the branch section. The reflecting section is arranged to reflect and return the shock wave back to an exhaust path and cause the shock wave to collide against the exhaust gas, thereby increasing the pressure of the exhaust gas. In accompaniment with the exhaust gas passing a divergent section of a convergent-divergent nozzle, a new shock wave propagating in a downstream direction in the exhaust path is generated, and the temperature and pressure of the exhaust gas are decreased. | 07-22-2010 |
20100192553 | INTERNAL COMBUSTION ENGINE, VEHICLE, MARINE VESSEL, AND EXHAUST GAS CLEANING METHOD FOR INTERNAL COMBUSTION ENGINE - An internal combustion engine capable of improving cleaning efficiency by preventing an increase in the temperature of the exhaust gas to lessen the deterioration of the catalyst. The internal combustion engine includes a convergent section, a divergent section, and a branch section. The branch section branches a shock wave, propagating in a downstream direction at a higher velocity than exhaust gas flowing into an exhaust path from a combustion chamber when an exhaust valve is opened, from a portion of the exhaust path which is upstream with respect to the divergent section, and propagates the shock wave back to the exhaust path. The exhaust gas is caused to pass the convergent section and to collide against the shock wave between the branch section and the divergent section, so as to increase the pressure of the exhaust gas in the convergent section. Such exhaust gas is caused to pass the divergent section to generate a new shock wave and to decrease the temperature of the exhaust gas. A catalyst of an exhaust cleaning device is provided in a portion of the exhaust path which is downstream with respect to the divergent section. | 08-05-2010 |
20100192556 | INTERNAL COMBUSTION ENGINE, VEHICLE, MARINE VESSEL, AND SECONDARY AIR SUPPLY METHOD FOR INTERNAL COMBUSTION ENGINE - An internal combustion engine capable of efficiently supplying air to an exhaust path even in a high load state. The internal combustion engine includes a convergent section, a divergent section, and a branch section. The branch section branches a shock wave, propagating in a downstream direction at a higher velocity than exhaust gas flowing into an exhaust path from a combustion chamber when an exhaust valve is opened, from a portion of the exhaust path which is upstream with respect to the divergent section, and propagates the shock wave back to the exhaust path. The exhaust gas is caused to pass the convergent section and to collide against the shock wave between the branch section and the divergent section so as to increase the pressure of the exhaust gas in the convergent section. Such exhaust gas is caused to pass the divergent section to generate a new shock wave. A secondary air supply system includes a supply section arranged to supply air to a portion of the exhaust path which is upstream with respect to the divergent section, using a negative pressure generated by the newly generated shock wave. | 08-05-2010 |
20100192557 | MULTI-CYLINDER INTERNAL COMBUSTION ENGINE, VEHICLE, MARINE VESSEL, AND EXHAUSTING METHOD FOR MULTI-CYLINDER INTERNAL COMBUSTION ENGINE - A multi-cylinder internal combustion engine capable of decreasing the pressure or temperature of exhaust gas. The internal combustion engine includes at least two cylinders and an exhaust path. The exhaust path includes a convergent-divergent nozzle and an exhaust merging section provided upstream with respect to an upstream end of the divergent section arranged to connect only exhaust ports of combustion chambers for which the opening periods do not overlap. A shock wave propagating in a merging upstream section is branched at a connection section, and the branched shock wave is reflected by an exhaust valve of cylinder and collides against the exhaust gas. In accompaniment with the passage of the exhaust gas having the pressure increased by the shock wave through the convergent-divergent nozzle, a new shock wave propagating in a downstream direction in the exhaust path is generated and also an expansion wave propagating in an upstream direction in the exhaust path is generated. Thus, the temperature and pressure of the exhaust gas are significantly decreased. | 08-05-2010 |
20130157532 | OUTBOARD MOTOR AND WATERCRAFT INCLUDING THE SAME - An outboard motor includes an engine, a water intake opening arranged to suck in water, and a water supply path arranged to supply the water sucked in through the water intake opening to the engine. The engine includes a water path arranged to cause the water supplied from the water supply path to flow in a water jacket of a cylinder head, a water jacket of an exhaust pipe, and a water jacket of a cylinder block in this order. | 06-20-2013 |
20130157533 | OUTBOARD MOTOR AND WATERCRAFT INCLUDING THE SAME - An outboard motor includes a left bank and a right bank. An exhaust port in each of the left bank and the right bank is arranged outward relative to a cylinder axis line in an outer motor width direction. A left exhaust pipe is arranged outward relative to a crankcase and the left bank in the outer motor width direction. A right exhaust pipe is arranged outward relative to the crankcase and the right bank in the outer motor width direction. A catalyst is located in each of the left and right exhaust pipes. | 06-20-2013 |
20130157534 | OUTBOARD MOTOR AND WATERCRAFT INCLUDING THE SAME - An outboard motor includes a V-shaped 4-cycle engine including fuel injection devices that directly inject fuel into combustion chambers. The engine includes a left intake path including a left path extending from an intake port in a left bank in an obliquely rearward and rightward direction, and a right intake path including a right path extending from an intake port in a right bank in an obliquely rearward and leftward direction. The left fuel injection device is located to the right of a cylinder axis line in the left bank. The right fuel injection device is located to the left of a cylinder axis line in the right bank. | 06-20-2013 |