Patents Assigned to Sanshin
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Patent number: 5803023Abstract: A system for reducing the corrosive effects of liquid coolant upon an engine of the type powering an outboard motor drawing coolant from a body of water in which it is positioned is disclosed. The system includes a number of anodes positioned within the clean-out holes of the cylinder head and block and having at least one surface positioned in contact with coolant passing through the coolant passages.Type: GrantFiled: December 30, 1996Date of Patent: September 8, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masanori Takahashi, Hitoshi Watanabe
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Patent number: 5803044Abstract: A throttle valve synchronization mechanism for a marine engine includes a throttle linkage which improves synchronization of throttle valve operation, while minimizing the opening degree of the throttle valves when moved to a closed position. The throttle linkage includes a linkage rod which carries a plurality of lugs. The lugs extends between the linkage rod and corresponding throttle levers of the throttle valves. The lugs are rotatably connected to the throttle levers and are rigidly fixed to the linkage rod. In one embodiment, the linkage rod lies in front of the throttle levers, and in another embodiment, the linkage rod lies to the side of the throttle levers.Type: GrantFiled: May 31, 1996Date of Patent: September 8, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Masahiko Kato
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Patent number: 5803036Abstract: An outboard motor having an upper unit containing an internal combustion engine and a lower unit containing an exhaust guide is disclosed. The engine has a vertically oriented crankshaft having an end extending from the bottom end of the engine. A flywheel is positioned on the crankshaft at the bottom end of the engine within a recess defined by the exhaust guide. A starter motor is positioned at the bottom end of the engine and is positioned at least partially within the exhaust guide, the motor having a gear for engaging the flywheel to start the engine.Type: GrantFiled: December 30, 1996Date of Patent: September 8, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masanori Takahashi, Hitoshi Watanabe
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Patent number: 5803777Abstract: A latching assembly for engaging and disengaging an upper cover portion and lower tray portion of a cowling of an outboard engine. The lower tray portion includes a recess in which part of the latching assembly is located. The latching assembly includes a shaft mounted to the lower tray portion. A latch is rotatably secured to the shaft and movable between an engaged and a disengaged position. The latch is disposed within the recess when engaged so that is is flush with the exterior of the cowling. A catch is mounted to the upper cover portion and is engageable by the latch hook. A mechanism for biasing the latch to the engaged or disengaged position is provided for preventing the latch from moving from the engaged or disengaged position.Type: GrantFiled: March 27, 1996Date of Patent: September 8, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Noriyoshi Hiraoka
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Patent number: 5803050Abstract: A fuel injected induction system for a crankcase compression, two-cycle, V-type internal combustion engine includes a plurality of throttle valves corresponding in number to the number of crankcase chamber of the engine. Each throttle valve communicates with a dedicated intake passage that directly communicates with a respective crankcase chamber. At least one fuel injector is positioned within each intake passage in order to form the air/fuel charge delivered to the crankcase chamber. The corresponding number of throttle valves, fuel injectors and crankcase chambers allows for enhanced control over the air-fuel ratio delivered to each of the cylinders, as well as improved consistence of the air-fuel charge delivered to each of the cylinders of the engine.Type: GrantFiled: February 20, 1996Date of Patent: September 8, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Takayuki Osakabe, Hitoshi Watanabe
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Patent number: 5800222Abstract: A number of embodiments of jet propulsion systems for watercraft that employ twin impellers contained within a common housing assembly at the end of a common inlet duct having a single water inlet opening that can be positioned centrally of the watercraft to avoid drawing air in during abrupt maneuvering. By using twin impellers, the use of straightening vanes can be substantially eliminated. In addition, a small dividing wall extends from the area forwardly of the impellers only into the water inlet ducts sufficiently so as to reduce counter-effects of swirling from between the two impellers and without requiring any substantial change in direction of the water flow from the water inlet opening to the impellers.Type: GrantFiled: August 11, 1995Date of Patent: September 1, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Masayoshi Nanami
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Patent number: 5800224Abstract: An integrated splash and anti-cavitation plate is provided for an outboard motor. The integrated plate decreases the overall weight of the outboard motor in order to improve the motor's performance. The decreased weight also lessens the load on the mounting structure which supports the outboard motor on the watercraft transom. In addition, the distance between the plate and the rotational axis of the propulsion shaft is such that the plate can effectively prevent water splash-up into the mounting structure, even when the outboard motor is run with its propellers partially exposed.Type: GrantFiled: September 5, 1996Date of Patent: September 1, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Hiroshi Ogino
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Patent number: 5800223Abstract: A marine propulsion device improves the handling characteristics and the responsiveness of the watercraft on which it is used. The propulsion device includes a pair of counter-rotating propellers. At least the blades of the front propeller each have a mean camber line in cross-section which has a generally constant radius of curvature. This blade shape reduces cavitations and permits the rear propeller to be mounted closer to the front propeller, and consequently closer to the steering axis of the outboard drive. As a result, steering torque is reduced. The blades of the rear propeller also are not more than thirty percent smaller than the blades of the front propeller, and the average pitches of the propellers do not differ by more than one to four percent. These blade configurations of the front and rear propellers improve the stability of the watercraft when turning, thereby reducing chine walk, as well as improve the responsiveness of the watercraft.Type: GrantFiled: May 22, 1996Date of Patent: September 1, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Yasushi Iriono, Yoshitsugu Sumino
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Patent number: 5799925Abstract: A tilting assembly for an outboard drive unit including a tilt locking means for selectively engaging a stop member, a tilt releasing means for disengaging the locking means from the stop member, a tilt holding means for selectively engaging a holder portion of a clamp bracket and a biasing means for biasing the holding means towards or away from the holder portion of the clamp bracket. The releasing means and biasing means are operatively associated through a single-piece lever that is configured so that the holding means is biased away from the holder portion when the stopping member is engaged by the locking means and towards the holder portion when the stopping member is disengaged from the locking means.Type: GrantFiled: April 22, 1996Date of Patent: September 1, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Atsushi Kumita, Manabu Yamamoto
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Patent number: 5797777Abstract: A control handle for the tiller of an outboard motor that embodies a twist-grip throttle control, a pivotally supported transmission control and a trim switch, all juxtaposed to each other but oriented in such a way so that actuation of one will not affect accidental actuation of any other control. The trim control is disposed in a projection on the lower side of the outer housing of the control handle and is disposed inwardly from the sides thereof and is protected by a flange.Type: GrantFiled: October 10, 1997Date of Patent: August 25, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Hiroyuki Tsunekawa, Kouji Abe
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Patent number: 5797378Abstract: An outboard motor includes a powerhead with an internal combustion engine and a protective cowling which surrounds the engine. A fuel supply system is carried by the outboard motor and delivers fuel to the engine. A cooling system is provided for the fuel supply system for removing heat from at least a portion of the fuel supply system so that gaseous bubble formation in the fuel of the fuel supply system is inhibited.Type: GrantFiled: November 27, 1996Date of Patent: August 25, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Masahiko Kato
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Patent number: 5797371Abstract: A cylinder-disabling control system for a multi-cylinder engine provided with an exhaust manifold to which each exhaust port is connected, which control system comprises an engine performance sensor, an operation mode selector for selecting the cylinder-disabling mode or the all-cylinders-engaged mode, depending on the engine performance, and a resuming controller for resuming the disabled cylinders one at a time when switching from the cylinder-disabling mode to the all-cylinders-engaged mode, thereby allowing for continuous and smooth switching between the cylinder-disabling mode and the all-cylinders-engaged mode.Type: GrantFiled: March 11, 1996Date of Patent: August 25, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Kimihiro Nonaka
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Patent number: 5794605Abstract: A feedback control system for controlling the fuel/air ratio of an engine. The system employs a fuel/air ratio or combustion condition sensor and includes a checking system for checking if the sensor is providing reliable data. This is determined by determining whether the output of the sensor changes when an adjustment in the amount of fuel supplied is made. If the sensor check indicates unreliable signals, then the system operates on an open control.Type: GrantFiled: March 5, 1996Date of Patent: August 18, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Masahiko Kato
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Patent number: 5794602Abstract: A ventilation system is provided to vent blow-by gases from a crankcase of an internal combustion engine and to deliver the blow-by gases back to the combustion chambers of the engine for eventual expulsion through the engine exhaust system. The ventilation system includes a lubricant separator located on the side of a cylinder block of the engine. The lubricant separator desirably lies beneath a charge former of the engine at a location which does not increase the overall girth of the engine. The ventilation system also desirably includes a secondary lubricant separator integrated into an intake air device which communicates with the charge former. Both the first and second lubricant separators deliver lubricant, which is separated from the vented blow-by gases back to a reservoir of a lubrication system. The blow-by gases that are vented through the first and second lubricant separators are delivered to the charge former through the intake air device.Type: GrantFiled: August 30, 1996Date of Patent: August 18, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Sakayuki Kimura
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Patent number: 5788546Abstract: A transmission for a dual, counter-rotational propeller system incorporates a shift assistor to yieldably cushion transmission engagement. The shift assistor desirably operates between one clutch of a dual clutch assembly and a clutch actuator. The shift assistor specifically yieldably couples the clutch to the actuator. The yieldably coupling permits relative movement between the shift assistor and the clutch during the shifting operation in order to allow the clutches to engage the corresponding gears separately (i.e., at different times). The shift assistor thus reduces coupling shock when shifting the transmission either into a forward or a reverse drive condition.Type: GrantFiled: July 22, 1996Date of Patent: August 4, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Hiroshi Ogino
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Patent number: 5782214Abstract: A two-cycle internal combustion engine for a watercraft that includes a cylinder block having a cylinder bore, a piston reciprocating in the cylinder bore and an exhaust port formed in the cylinder block. An exhaust path extends from the cylinder bore for exhausting combustion products from the cylinder bore. An exhaust control valve cooperates with the exhaust port and is movable between at least a first position for advancing the closing of the exhaust port so as to increase the compression ratio in the engine and a second position for delaying the closing of the exhaust port so as to decrease the compression ratio in the engine. Means for controlling the exhaust control valve between the first and second position are provided and are controlled in response to a watercraft condition.Type: GrantFiled: June 20, 1996Date of Patent: July 21, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masayoshi Nanami, Ryoichi Nakase
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Patent number: 5782659Abstract: An improved propulsion unit control system for marine units having at least two propulsion systems. A single lever control controls the speed of both propulsion systems and if a difference in speed occurs, the speed of the faster propulsion unit is reduced. In addition, each propulsion unit includes a respective abnormal condition sensor which outputs a signal to a common control system. This common control system reduces the speed of both propulsion units when an abnormal condition is sensed in either unit.Type: GrantFiled: January 30, 1996Date of Patent: July 21, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventor: Hitoshi Motose
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Patent number: 5778848Abstract: A four-cycle outboard motor having an oil tank that is disposed at least in part in the drive shaft housing of the outboard motor and an oil pump that is driven off of the lower end of the crankshaft. At least a portion of the conduits for transmitting oil from the oil tank to the oil pump and from the oil pump to the engine for its lubrication being formed integrally in a lower face of the cylinder block.Type: GrantFiled: August 2, 1996Date of Patent: July 14, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masanori Takahashi, Atsushi Isogawa
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Patent number: 5778847Abstract: An outboard motor having a high-performance V-type twin overhead cam four-cycle internal combustion engine. The oil reservoir for the engine is disposed in a driveshaft housing below the engine and an oil pump is driven off the lower end of the engine crankshaft for circulating the oil from the oil tank to the engine. The oil supply system for the engine includes a vertically extending main gallery and a drain passage which extend in parallel side-by-side relationship and which are disposed over the oil tank for ease of oil return. The exhaust and cooling system for the engine is configured so as to minimize heat transfer between the exhaust system and the lubricating system and to maintain a compact assembly.Type: GrantFiled: July 31, 1996Date of Patent: July 14, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masanori Takahashi, Atushi Isogawa
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Patent number: 5778836Abstract: A two-cycle engine having a plurality of combustion chambers, each chamber in communication with an air/fuel mixture delivery passage via a crankcase chamber, is disclosed. The engine includes a system for delivering fuel which precipitates out of the air/fuel mixture within the delivery passage to the combustion chambers. The system includes at least one fuel catch in the form of a trough positioned in each delivery passage and a fuel delivery passage extending from the catch to the combustion chamber.Type: GrantFiled: January 10, 1997Date of Patent: July 14, 1998Assignee: Sanshin Kogyo Kabushiki KaishaInventors: Masafumi Sougawa, Kyoji Hakamata, Hisanori Genma