JP2010031650A - Outboard motor - Google Patents

Abstract

An outboard motor capable of suppressing the complexity of electrical wiring is provided.
An outboard motor (1) includes a throttle body (32) including an engine body (20), an air passage (32a) for air supplied to the engine body (20), and a throttle valve (32b) for adjusting a flow rate of air flowing through the air passage (32a). A throttle opening sensor 35 that detects the opening of the throttle valve 32b and an intake air temperature sensor 37 that detects the temperature of air in the throttle body 32 are provided. The throttle opening sensor 35 and the intake air temperature sensor 37 are attached to the upper portion of the throttle body 32.
[Selection] Figure 9

Description

  The present invention relates to an outboard motor, and more particularly to an outboard motor including a throttle opening sensor that detects the opening of a throttle valve and an intake air temperature sensor that detects the temperature of air.

  Conventionally, an outboard motor including a throttle opening sensor that detects the opening of a throttle valve and an intake air temperature sensor that detects the temperature of air is known (for example, see Patent Document 1).

  In the outboard motor of Patent Document 1, a throttle opening sensor is attached to the throttle body, and an intake air temperature sensor is attached to the side surface of the surge tank.

Japanese Patent Laid-Open No. 9-20787

  However, as described above, when the throttle opening sensor is attached to the throttle body and the intake air temperature sensor is attached to the surge tank, the electric wiring connected to each sensor (throttle opening sensor and intake air temperature sensor) is throttled. It must be extended to both the body and the surge tank. For this reason, there is a problem that electrical wiring becomes complicated.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an outboard motor capable of suppressing the complexity of electrical wiring. is there.

Means for Solving the Problems and Effects of the Invention

  An outboard motor according to an aspect of the present invention includes an engine, an air passage for air supplied to the engine, a throttle body that adjusts a flow rate of air flowing through the air passage, and an opening degree of the throttle valve. A throttle opening sensor for detecting and an intake air temperature sensor for detecting the temperature of air in the throttle body are provided, and the throttle opening sensor and the intake air temperature sensor are attached to the upper part of the throttle body.

  In the outboard motor according to this aspect, as described above, by attaching the throttle opening sensor and the intake air temperature sensor to the throttle body, the electric wiring connected to each sensor (throttle opening sensor and intake air temperature sensor) Since it should just extend to a throttle body, it can suppress that an electrical wiring becomes complicated. In addition, when the throttle opening sensor and intake air temperature sensor are attached to the top of the throttle body, even if water containing moisture and salt on the ocean has condensed and collected in the air passage of the throttle body, the condensed salinity etc. Can be prevented from adhering to the throttle opening sensor and the intake air temperature sensor. Thereby, it can suppress that detection accuracy falls due to salt adhering to a throttle opening sensor and an intake air temperature sensor.

  The outboard motor according to the above aspect preferably further includes an intake pressure sensor for detecting the pressure of air in the throttle body, and the intake pressure sensor is also attached to the upper portion of the throttle body. With this configuration, since the electrical wiring connected to the intake pressure sensor only needs to be extended to the throttle body, it is possible to prevent the electrical wiring from becoming complicated even when an intake pressure sensor is further provided. In addition, by attaching the intake pressure sensor to the upper portion of the throttle body, it is possible to suppress a decrease in detection accuracy due to adhesion of salt to the intake pressure sensor. In addition, by attaching the intake pressure sensor to the upper portion of the throttle body, the air conduction path connecting the intake pressure sensor and the air passage of the throttle body can be shortened.

  In this case, the intake air temperature sensor may be arranged at the upper part upstream of the throttle valve of the throttle body, and the intake pressure sensor may be arranged at the upper part of the throttle body downstream of the throttle valve.

  In the configuration including the intake pressure sensor, preferably, an idle speed control unit that adjusts an air flow rate when the engine is idling is further provided, and the idle speed control unit is also attached to an upper portion of the throttle body. If comprised in this way, since the electrical wiring connected to an idle speed control unit should just be extended to a throttle body, even when an idle speed control unit is further provided, it can suppress that an electrical wiring becomes complicated. . In addition, by attaching the idle speed control unit to the upper portion of the throttle body, it is possible to suppress the occurrence of malfunction due to the adhesion of salt to the idle speed control unit.

  In this case, preferably, the throttle body includes an bypass air passage that passes through an upper portion of the throttle body and connects an upstream side and a downstream side with respect to a throttle valve of the air passage, and is an idle mounted on the upper portion of the throttle body. The speed control unit is configured to adjust the flow rate of air in the bypass air passage. With this configuration, even when marine moisture and salty air condenses and accumulates in the air passage of the throttle body, the bypass air passage for introducing air for idling is provided at the top of the throttle body. Therefore, it is possible to prevent salt from adhering to the bypass air passage.

  In the configuration in which the throttle body includes a bypass air passage, preferably, a vapor separator tank for separating the vapor of fuel supplied to the engine from the liquid fuel is further provided, and the vapor of fuel separated in the vapor separator tank is The throttle body is configured to escape to the upstream side of the throttle valve. With this configuration, even when the throttle valve is closed during idling, the vapor can be sucked into the engine through the bypass air passage and burned. Thereby, since vapor | steam can be suppressed to discharge | release to air | atmosphere without being burned, it can suppress that environmental pollution arises.

  In this case, preferably, the throttle body further includes an escape hole provided on the upstream side of the throttle valve so that the vapor of fuel separated in the vapor separator tank is released to the throttle body via the escape hole. It is configured. If comprised in this way, a vapor | steam can be easily escaped to a throttle body.

  In the configuration including the idle speed control unit, the vapor separator tank for separating the fuel vapor supplied to the engine from the liquid fuel, and one end connected to the engine and the other end being the throttle An intake pipe connected to the body and arranged along the side surface of the engine is further provided, and the vapor separator tank is arranged between the engine and the intake pipe in a plan view. With this configuration, when the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit are attached to the throttle body, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit are attached to the intake pipe. Unlike the above, the air flow between the engine and the intake pipe can be improved. Thereby, since the flow of air around the vapor separator tank disposed between the engine and the intake pipe can be improved, the vapor separator tank can be efficiently cooled. Thereby, since it is suppressed that the temperature of the fuel in a vapor separator tank raises, it can suppress that vapor (fuel vapor) arises. Further, since the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit are not attached to the intake pipe, the area in which the vapor separator tank can be disposed can be increased accordingly. Thereby, since the volume of the vapor separator tank can be increased, an increase in the temperature of the fuel in the vapor separator tank can be suppressed, and this also suppresses the generation of vapor (fuel vapor). be able to.

  In the configuration including the idle speed control unit, preferably, the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and a holding member that holds the idle speed control unit are further provided, and the holding member is attached to an upper portion of the throttle body. It has been. With this configuration, the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit can be attached to the throttle body all at once by simply attaching the holding member to the throttle body. The assembly of the machine can be improved.

  In this case, preferably, the holding member is formed by resin molding so as to integrally hold the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit. If comprised in this way, it can suppress easily that a throttle opening sensor, an intake air temperature sensor, an intake pressure sensor, and an idle speed control unit drop from a holding member.

  In the configuration including the holding member, preferably, the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and an engine control unit that electrically controls the idle speed control unit are further provided, and the holding member includes the throttle opening sensor. One connector for electrically connecting the intake air temperature sensor, the intake pressure sensor, the idle speed control unit, and the engine control unit is held. With this configuration, the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, the idle speed control unit, and the engine control unit can be electrically connected by a single connector. Can be further improved.

  In the configuration including the holding member, preferably, the holding member is formed in a flat plate shape, and the upper portion of the throttle body has a flat surface corresponding to the flat plate-like holding member. The body is fixed at a plurality of locations in a state where the holding member is disposed on the flat surface of the throttle body. If comprised in this way, since a holding member and a throttle body can be attached in the state which surface-contacted, a throttle body and a holding member can be fixed firmly and stably.

  In this case, it is preferable that a first groove that is electrically connected to the intake pressure sensor and a second groove provided in the vicinity of the first groove are formed on the surface of the holding member on the throttle body side. The surface is formed with a third groove and a hole that is electrically connected to the air passage, and the hole and the third groove are electrically connected via the second groove in a state where the holding member and the throttle body are fixed. At the same time, the first groove and the second groove are electrically connected via the third groove, thereby forming an air conduction path that connects the intake pressure sensor and the air passage. If comprised in this way, a part of air conduction path comprised in the state to which the holding member and the throttle body were fixed can be made into the maze structure which consists of a 1st groove | channel, a 2nd groove | channel, and a 3rd groove | channel. . By providing a labyrinth structure in the air passage that connects the intake pressure sensor and the air passage, it is possible to more reliably suppress the condensation of moisture and salt on the intake pressure sensor.

  In the outboard motor according to the above aspect, the throttle valve preferably includes a valve plate and a valve shaft that extends in a vertical direction from a lower portion to an upper portion of the throttle body and rotatably supports the valve plate. The rotation angle of the valve shaft is detected by a throttle opening sensor attached to the upper part of the body. If comprised in this way, the opening degree of a throttle valve can be easily detected with the throttle opening degree sensor attached to the upper part of the throttle body.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing the overall configuration of an outboard motor according to an embodiment of the present invention. 2 to 12 are diagrams for explaining the detailed structure of the engine unit of the outboard motor shown in FIG. First, with reference to FIGS. 1-12, the structure of the outboard motor 1 by one Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the outboard motor 1 is connected to the engine unit 2, the drive shaft 3 that is rotated by the driving force of the engine unit 2 and extends in the vertical direction (Z direction), and the lower end of the drive shaft 3. A forward / reverse switching mechanism 4, a propeller shaft 5 connected to the forward / backward switching mechanism 4 and extending in the horizontal direction, and a propeller 6 attached to the rear end portion of the propeller shaft 5 are provided. The engine unit 2 is housed in the cowling 7. A drive shaft 3, a forward / reverse switching mechanism 4, and a propeller shaft 5 are accommodated in an upper case 8 and a lower case 9 disposed below the cowling 7. The outboard motor 1 is attached via a clamp bracket 10 to a stern plate 101 provided on the backward direction (arrow A direction) side of the hull 100. The clamp bracket 10 supports the outboard motor 1 so as to be swingable up and down with respect to the hull 100 about the tilt shaft 10a. The hull 100 is provided with a fuel tank 102 for storing fuel (gasoline). The fuel tank 102 and the engine unit 2 of the outboard motor 1 are connected by a fuel pipe (not shown), and the engine unit 2 of the outboard motor 1 is driven using fuel supplied from the fuel tank 102. The propeller 6 is rotated by the driving force of the engine unit 2, and the forward / reverse switching mechanism 4 switches the rotation direction of the propeller 6, whereby the hull 100 moves forward (arrow B direction) or reverse (arrow A direction). To be promoted. Further, a vent hole 7a is provided on the side of the cowling 7 in the reverse direction (arrow A direction), and the air supplied to the engine unit 2 is supplied to the engine unit 2 in the cowling 7 through the vent hole 7a. It is captured.

  As shown in FIGS. 2 to 6, the engine unit 2 includes an engine body 20, an intake system 30 for supplying air to the engine body 20, a fuel system 40 for supplying fuel to the engine body 20, an ECU ( (Engine Control Unit) 50 (see FIGS. 5 and 6). The engine body 20 and the ECU 50 are examples of the “engine” and “engine control unit” of the present invention, respectively.

  As shown in FIG. 3, the engine body 20 includes three cylinders 21 arranged in the vertical direction (Z direction in FIG. 2) and pistons 22 that reciprocate in the horizontal directions in the cylinders 21. The piston 22 is connected via a connecting rod 23 to a crankshaft 24 that extends in the vertical direction (Z direction). The reciprocating motion of the piston 22 in the horizontal direction is converted into rotational motion by the connecting rod 23 and the crankshaft 24. The lower end of the crankshaft 24 is connected to the drive shaft 3 (see FIG. 1). As shown in FIG. 2, the rotation of the crankshaft 24 is performed by a pulley (not shown) fixed to the upper portion of the crankshaft 24, a belt 25, and a pulley fixed to the camshaft 26 (see FIG. 3). 27 to be transmitted to the camshaft 26. As the cam shaft 26 rotates, the intake valve 28 and the exhaust valve 29 of each cylinder 21 are driven at a predetermined timing.

  As shown in FIGS. 2 to 4, the intake system 30 is disposed on the side of the engine body 20 along the right side portion in the forward direction of the engine body 20 (arrow B direction). The intake system 30 is disposed on the forward direction (arrow B direction) side and has a silencer case 31 having an intake port 31a (see FIG. 3), a throttle body 32 connected to the silencer case 31, and a connection to the throttle body 32. The surge tank 33 and the three intake pipes 34 extending from the surge tank 33 and connected to the intake ports of the three cylinders 21 of the engine body 20 are included. The throttle body 32 is connected to the surge tank 33 and the silencer case 31 via screws 150.

  As shown in FIGS. 7 to 12, the throttle body 32 is made of resin or metal and has a cylindrical air passage 32a. A butterfly throttle valve 32b is provided in the air passage 32a. The throttle valve 32b has a circular valve plate 321 and a valve shaft 322 that extends from the lower part to the upper part of the throttle body 32 in the vertical direction (Z direction) and rotatably supports the valve plate 321. . As shown in FIGS. 8 and 9, the upper end 322 a of the valve shaft 322 protrudes upward from the flat upper surface 323 of the throttle body 32. As shown in FIG. 10, a connecting portion 324 connected to an accelerator lever (not shown) of the outboard motor 1 is fixed to the lower end portion of the valve shaft 322, and the connecting portion 324 is attached in accordance with the accelerator operation by the user. The valve shaft 322 and the valve plate 321 are configured to be rotated via the. The valve shaft 322 is biased by the torsion spring 325 in the direction in which the valve plate 321 is closed. 8-12, the throttle body 32 is integrally provided with a bypass air passage 32c that connects the upstream side and the downstream side with respect to the throttle valve 32b of the air passage 32a. Specifically, as shown in FIGS. 7, 8, and 11, the bypass air passage 32c includes a hole 326 formed on the upstream side with respect to the throttle valve 32b of the air passage 32a, and the air passage 32a. A hole 327 formed on the downstream side of the throttle valve 32b is connected. As shown in FIG. 9, the bypass air passage 32 c is formed so as to pass through the upper portion of the throttle body 32, and is opened on the upper surface 323 of the throttle body 32. The bypass air passage 32c functions as an air passage in a state where a holding member 39 described later is attached to the upper surface 323 of the throttle body 32. The bypass air passage 32c ensures an idling air flow rate when the throttle valve 32b is fully closed.

  As shown in FIGS. 7 to 9, the throttle body 32 is formed with a hole 328 formed so as to penetrate from the upper surface 323 to the air passage 32a in a region upstream of the throttle valve 32b. Further, a hole 329 formed so as to penetrate from the upper surface 323 to the air passage 32a is formed in a region downstream of the throttle valve 32b. A groove 329 a (see FIG. 9) is formed in the vicinity of the hole 329 on the upper surface 323 of the throttle body 32. Three screw holes 330 (see FIG. 9) are formed in the outer edge portion of the upper surface 323 of the throttle body 32. Further, a hole 331 is formed in a side portion of the throttle body 32 in a region upstream of the throttle valve 32b. The hole 331 is connected to the vapor separator tank 43 through the pipes 46a and 46b. The hole 331 is an example of the “relief hole” in the present invention.

  Here, in this embodiment, as shown in FIGS. 8 to 12, three sensors for controlling the fuel injection amount of the injector 45 (throttle opening sensor 35, intake pressure sensor) are provided at the upper portion of the throttle body 32. 36 and an intake air temperature sensor 37) and an idle speed control unit 38 (hereinafter referred to as ISC unit 38) for adjusting the air flow rate during idling are attached. Note that “attaching to the upper part of the throttle body 32” means that the throttle body 32 is fixed to a part on the upper surface side of the throttle body 32, unlike a state in which the throttle body 32 is attached to a member different from the throttle body 32. It means a state. The ISC unit 38 includes a motor 38a and a valve 38b that moves up and down by driving the motor 38a, and is disposed in the middle of the bypass air passage 32c. By moving the valve 38b up and down, the flow rate of the air passing through the bypass air passage 32c can be controlled, and the engine speed during idling can be controlled.

  In this embodiment, the throttle opening sensor 35, the intake pressure sensor 36, the intake air temperature sensor 37, and the ISC unit 38 are integrally held by a resin holding member 39 formed in a flat plate shape. The holding member 39 is fixed at three positions in a state of being disposed on the upper surface 323 of the throttle body 32. Specifically, the holding member 39 has three screw insertion holes 39 a, and the holding member 39 has 3 on the upper surface 323 of the throttle body 32 through the screw insertion holes 39 a and the screw holes 330 of the throttle body 32. It is fixed by two screws 151 (see FIG. 7). The throttle opening sensor 35 detects the rotation angle of the valve shaft 322a by being engaged with the valve shaft 322a protruding from the upper surface 323 of the throttle body 32 with the holding member 39 fixed to the throttle body 32. It is configured.

  Further, in a state where the holding member 39 is fixed to the throttle body 32, suction is performed through the hole 329 and the groove 329a of the throttle body 32 and the two grooves 39b and 39c (see FIG. 9) formed in the holding member 39. The atmospheric pressure sensor 36 and the air passage 32a of the throttle body 32 are connected. Specifically, the groove 39 b and the groove 39 c are formed in the vicinity of each other, and the groove 39 c is electrically connected to the intake pressure sensor 36. Further, the groove 39b is formed at a position overlapping with a part of the hole 329 and the groove 329a, and the groove 329a is formed at a position overlapping with a part of the groove 39b and a part of the groove 39c. With the holding member 39 and the throttle body 32 fixed, the hole 329 and the groove 329a are electrically connected via the groove 39b, and the groove 39c and the groove 39b are electrically connected via the groove 329a. The hole 329, the groove 39b, and the grooves 329a and 39c form an air conduction path that conducts the air passage 32a and the intake pressure sensor 36 in this order. Further, a part of the air conduction path has a labyrinth structure by the groove 39c, the groove 39b, and the groove 329a. Thereby, the intake pressure sensor 36 can detect the air pressure downstream of the throttle valve 32 b of the throttle body 32. The groove 39b, the groove 39c, and the groove 329a are examples of the “second groove”, the “first groove”, and the “third groove” in the present invention, respectively.

  The intake air temperature sensor 37 protrudes from the lower surface 39d (see FIG. 9) of the holding member 39. With the holding member 39 fixed to the throttle body 32, the air passage 32a is passed through a hole 328 formed in the throttle body 32. Protrusively inside. The intake air temperature sensor 37 detects the air temperature upstream of the throttle valve 32 b of the throttle body 32. A seal member 391 (FIG. 9) is provided on the lower surface 39d of the holding member 39 which is joined to the upper surface 323 of the throttle body 32 so as to surround each sensor (throttle opening sensor 35, intake pressure sensor 36 and intake temperature sensor 37) and the ISC unit 38. Is attached). The sealing member 391 seals the mating surface between the upper surface 323 of the throttle body 32 and the lower surface 39 d of the holding member 39 in a state where the holding member 39 is fixed to the throttle body 32. Thereby, seawater and the like are prevented from entering from the outside through the mating surface of the throttle body 32 and the holding member 39, and air is prevented from leaking from the bypass air passage 32c and the like. The holding member 39 also integrally holds one connector 39e, and the ECU 50, each sensor (throttle opening sensor 35, intake pressure sensor 36 and intake temperature sensor 37) and the ISC unit 38 are connected via a connector 39e. Connected.

  As shown in FIGS. 2 to 5, the fuel system 40 is connected to a filter 41 connected to a fuel tank 102 arranged in the hull 100, a low-pressure fuel pump 42 connected to the filter 41, and a low-pressure fuel pump 42. The vapor separator tank 43, the high-pressure fuel pump 44 (see FIG. 5) for transporting the fuel in the vapor separator tank 43, and the injector 45 for injecting the fuel transported by the high-pressure fuel pump 44 are included.

  The low pressure fuel pump 42 has a function of transporting fuel from the fuel tank 102 to the vapor separator tank 43. Further, the fuel sucked up from the fuel tank 102 of the hull 100 by the low-pressure fuel pump 42 passes through the filter 41, so that foreign matters contained in the fuel are removed.

  The fuel sent out by the low-pressure fuel pump 42 is stored in the vapor separator tank 43. As shown in FIGS. 3 and 4, the vapor separator tank 43 is disposed between the engine body 20, the surge tank 33, and the intake pipe 34 in a plan view. In the present embodiment, the air taken in from the vent hole 7a of the cowling 7 passes through the path indicated by the arrows in FIGS. 3 and 4 and flows into the intake port 31a of the silencer case 31. That is, the air taken in from the vent hole 7a is between the engine body 20 and the vapor separator tank 43, between the vapor separator tank 43 and the intake system 30 (intake pipe 34, surge tank 33), and the engine body 20 And the surge tank 33 and flows into the inlet 31 a of the silencer case 31.

  The vapor separator tank 43 stores fuel pumped up from the fuel tank 102 and separates fuel vapor (vapor) or air from liquid fuel. As shown in FIG. 5, in the vapor separator tank 43, the fuel stored in the tank is kept at a constant amount, and the liquid level of the fuel in the vapor separator tank 43 is kept at a predetermined height position. It is configured to be. Specifically, a float 43 a having a needle valve 43 b is provided in the vapor separator tank 43. When the fuel level in the vapor separator tank 43 exceeds a predetermined height, the flow of fuel into the vapor separator tank 43 is automatically stopped by the needle valve 43b of the float 43a. Further, when the fuel level in the vapor separator tank 43 becomes lower than a predetermined height, the inflow of fuel into the vapor separator tank 43 is automatically started. With such a mechanism, the fuel stored in the vapor separator tank 43 is maintained at a constant amount, and the liquid level of the fuel in the vapor separator tank 43 is maintained at a predetermined height. Yes.

  The high-pressure fuel pump 44 is disposed in the vapor separator tank 43 and has a function of transporting fuel having a predetermined pressure to the injector 45. The injector 45 has a function of injecting fuel delivered at a predetermined pressure by the high-pressure fuel pump 44 to the vicinity of the intake port of the cylinder 21 (see FIG. 3) at a predetermined timing.

  As shown in FIGS. 2, 4 and 7, the upper portion of the vapor separator tank 43 is connected to a hole 331 provided in a side portion of the throttle body 32 via a pipe 46a and a pipe 46b. Thereby, the vapor of the vapor separator tank 43 is configured to escape to the air passage 32a of the throttle body 32. An electromagnetic valve 47 is provided between the pipe 46a and the pipe 46b. By controlling the electromagnetic valve 47, it is possible to control the timing at which the vapor is released.

  As shown in FIGS. 5 and 6, the ECU 50 electrically controls the high-pressure fuel pump 44, the injector 45, the electromagnetic valve 47, and the ISC unit 38. The fuel injection amount of the injector 45 is controlled based on detection results of a throttle opening sensor 35, an intake air temperature sensor 37, and an intake pressure sensor 36 attached to the throttle body 32.

  In the present embodiment, as described above, by attaching the throttle opening sensor 35 and the intake air temperature sensor 37 to the throttle body 32, electric wiring connected to each sensor (the throttle opening sensor 35 and the intake air temperature sensor 37) is provided. Since it is sufficient to extend only to the throttle body 32, it is possible to prevent the electrical wiring from becoming complicated. In addition, when the throttle opening sensor 35 and the intake air temperature sensor 37 are attached to the upper portion of the throttle body 32, even when air containing moisture and salt on the sea has condensed and accumulated in the air passage 32 a of the throttle body 32, It is possible to prevent the condensed salt and the like from adhering to the throttle opening sensor 35 and the intake air temperature sensor 37. As a result, it is possible to suppress a decrease in detection accuracy due to the adhesion of salt to the throttle opening sensor 35 and the intake air temperature sensor 37.

  In the present embodiment, as described above, the intake pressure sensor 36 is also attached to the upper portion of the throttle body 32 so that the electrical wiring connected to the intake pressure sensor 36 may be extended to the throttle body 32. Even in the case of further providing an electrical wiring, it is possible to prevent the electrical wiring from becoming complicated. In addition, by attaching the intake pressure sensor 36 to the upper portion of the throttle body 32, it is possible to suppress a decrease in detection accuracy due to the adhesion of salt to the intake pressure sensor 36.

  In the present embodiment, as described above, the ISC unit 38 is also attached to the upper portion of the throttle body 32, so that the electrical wiring connected to the ISC unit 38 may be extended to the throttle body 32. Therefore, the ISC unit 38 is further provided. In this case, the electrical wiring can be prevented from becoming complicated. Further, by attaching the ISC unit 38 to the upper portion of the throttle body 32, it is possible to suppress the occurrence of malfunction due to adhesion of salt to the ISC unit 38.

  In the present embodiment, as described above, the bypass air passage 32c that passes through the upper portion of the throttle body 32 and connects the upstream side and the downstream side to the throttle valve 32b of the air passage 32a is provided in the throttle body 32. By adjusting the flow rate of the air in the bypass air passage 32c by the ISC unit 38 provided at the upper part of the throttle body 32, the water containing moisture and salt on the sea is condensed to the air passage 32a of the throttle body 32. Even in the case of accumulation, the bypass air passage 32c for introducing the air for idling is provided in the upper part of the throttle body 32, so that it is possible to suppress the salt from adhering to the bypass air passage 32c.

  Further, in the present embodiment, as described above, the fuel vapor separated in the vapor separator tank 43 is released to the upstream side of the throttle valve 32b of the throttle body 32, so that the throttle valve 32b is closed during idling. Even in this case, vapor can be sucked into the engine body 20 through the bypass air passage 32c and burnt. Thereby, since vapor | steam can be suppressed to discharge | release to air | atmosphere without being burned, it can suppress that environmental pollution arises.

  In the present embodiment, as described above, the vapor of fuel separated in the vapor separator tank 43 is easily released to the throttle body 32 through the hole 331 provided in the side portion of the throttle body 32. Can be released to the throttle body 32.

  In the present embodiment, as described above, the intake temperature sensor 37, the intake pressure sensor 36, and the ISC unit are provided by attaching the sensors (the intake temperature sensor 37 and the intake pressure sensor 36) and the ISC unit 38 to the throttle body 32. Since 38 is attached to the throttle body 32, the engine body 20 and the surge tank 33 or 38 are different from the case where the intake air temperature sensor 37, the intake pressure sensor 36 and the ISC unit 38 are attached to the surge tank 33 or the intake pipe 34. The flow of air between the intake pipe 34 can be improved. Thereby, since the flow of air around the vapor separator tank 43 disposed between the engine body 20 and the surge tank 33 or the intake pipe 34 can be improved, the vapor separator tank 43 can be cooled efficiently. . Thereby, since it is suppressed that the temperature of the fuel in the vapor separator tank 43 rises, it can suppress that vapor (fuel vapor | steam) arises. Further, since the intake air temperature sensor 37, the intake pressure sensor 36 and the ISC unit 38 are not attached to the surge tank 33 or the intake pipe 34, the space between the engine body 20 and the surge tank 33 or the intake pipe 34 is correspondingly increased. The area where the vapor separator tank 43 can be disposed can be increased. As a result, the volume of the vapor separator tank 43 disposed between the engine body 20 and the surge tank 33 or the intake pipe 34 can be increased, so that an increase in the temperature of the fuel in the vapor separator tank 43 is suppressed. This can also suppress the generation of vapor (fuel vapor).

  In the present embodiment, as described above, the throttle opening sensor 35, the intake air temperature sensor 37, the intake pressure sensor 36, and the ISC unit 38 are held by the holding member 39, and the holding member 39 is placed above the throttle body 32. By attaching, the throttle opening sensor 35, the intake air temperature sensor 37, the intake pressure sensor 36 and the ISC unit 38 can all be attached to the throttle body 32 simply by attaching the holding member 39 to the throttle body 32. Can be improved.

  In the present embodiment, as described above, the holding member 39 is formed by resin molding so as to integrally hold the throttle opening sensor 35, the intake air temperature sensor 37, the intake pressure sensor 36, and the ISC unit 38. Thus, the throttle opening sensor 35, the intake air temperature sensor 37, the intake pressure sensor 36, and the ISC unit 38 can be easily prevented from falling off the holding member 39.

  In the present embodiment, as described above, one connector for electrically connecting the throttle opening sensor 35, the intake air temperature sensor 37, the intake air pressure sensor 36, the ISC unit 38 and the ECU 50 to the holding member 39. By holding 39e integrally, the throttle opening sensor 35, the intake air temperature sensor 37, the intake pressure sensor 36, the ISC unit 38 and the ECU 50 can be electrically connected by one connector 39e. The assemblability of the machine 1 can be further improved.

  In the present embodiment, as described above, the holding member 39 is formed in a flat plate shape, and a flat surface corresponding to the flat plate holding member 39 is provided on the throttle body 32 so that the holding member 39 and the throttle body 32 are provided. Can be attached in a state where the holding member 39 and the throttle body 32 are in surface contact with each other, so that the throttle body 32 and the holding member 39 can be firmly and stably fixed. .

  In the present embodiment, the throttle attached to the upper portion of the throttle body 32 is detected by detecting the rotation angle of the valve shaft 322 by the throttle opening sensor 35 attached to the upper portion of the throttle body 32 as described above. The opening degree sensor 35 can easily detect the opening degree of the throttle valve 32b.

  In the present embodiment, as described above, in a state where the holding member 39 and the throttle body 32 are fixed, the hole 329 and the groove 329a are conducted through the groove 39b, and the groove 39c and the groove 39b are connected to each other. By conducting through the groove 329a, an air conducting path connecting the intake pressure sensor 36 and the air path 32a is configured. With this configuration, a part of the air conduction path configured in a state where the holding member 39 and the throttle body 32 are fixed can have a maze structure including the groove 39b, the groove 39c, and the groove 329a. . By providing a labyrinth structure in the air passage that connects the intake pressure sensor 36 and the air passage 32a, it is possible to more reliably suppress the condensation of moisture and salt on the intake pressure sensor 36.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the intake pressure sensor 36 is attached to the throttle body 32 has been described. However, the present invention is not limited to this, and an atmospheric pressure sensor may be provided instead of the intake pressure sensor. In this case, this atmospheric pressure sensor may be attached to the throttle body.

  In the above embodiment, the example in which the ISC unit 38 is attached to the throttle body 32 has been described. However, the present invention is not limited to this, and the ISC unit 38 may be attached to the surge tank 33 or the like.

  In the above embodiment, the throttle opening sensor 35, the intake pressure sensor 36, the intake air temperature sensor 37, and the ISC unit 38 are attached to the upper portion of the throttle body 32 while being held by the holding member 39. The present invention is not limited to this, and a throttle opening sensor, an intake pressure sensor, an intake air temperature sensor, and an ISC unit may be individually attached to the upper portion of the throttle body.

1 is a side view showing an overall configuration of an outboard motor according to an embodiment of the present invention. It is a perspective view which shows the engine part of the outboard motor by one Embodiment of this invention shown in FIG. It is a top view which shows the engine part of the outboard motor by one Embodiment of this invention shown in FIG. FIG. 2 is a side view showing an engine unit of the outboard motor according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is a system diagram showing an outboard motor according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is a block diagram illustrating an outboard motor according to an embodiment of the present invention illustrated in FIG. 1. FIG. 2 is a perspective view showing a throttle body of the outboard motor according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is a schematic view showing a throttle body of the outboard motor according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is an exploded perspective view showing a throttle body of the outboard motor according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is a side view showing a throttle body of the outboard motor according to the embodiment of the present invention shown in FIG. 1. It is sectional drawing along the 200-200 line | wire of FIG. It is sectional drawing along the 300-300 line | wire of FIG.

Explanation of symbols

1 Outboard motor 20 Engine body (engine)
32 Throttle body 32a Air passage 32b Throttle valve 32c Bypass air passage 34 Intake pipe 35 Throttle opening sensor 36 Intake pressure sensor 37 Intake temperature sensor 38 ISC unit (idle speed control unit)
39 Holding member 39b Groove (second groove)
39c groove (first groove)
39e Connector 43 Vapor separator tank 50 ECU (Engine control unit)
321 Valve plate 322 Valve shaft 329 Hole 329a Groove (third groove)
331 holes (relief holes)

Claims (14)

Engine,
A throttle body including an air passage for air supplied to the engine, and a throttle valve for adjusting a flow rate of air flowing through the air passage;
A throttle opening sensor for detecting the opening of the throttle valve;
An intake air temperature sensor for detecting the temperature of air in the throttle body,
The outboard motor, wherein the throttle opening sensor and the intake air temperature sensor are attached to an upper portion of the throttle body. An intake pressure sensor for detecting the pressure of air in the throttle body,
The outboard motor according to claim 1, wherein the intake pressure sensor is also attached to an upper portion of the throttle body. The intake air temperature sensor is disposed at an upper part on the upstream side of the throttle valve of the throttle body,
The outboard motor according to claim 2, wherein the intake pressure sensor is disposed at an upper portion of the throttle body on the downstream side with respect to the throttle valve. An idle speed control unit that adjusts an air flow rate when the engine is idling;
The outboard motor according to claim 2 or 3, wherein the idle speed control unit is also attached to an upper portion of the throttle body. The throttle body includes a bypass air passage that passes through an upper portion of the throttle body and connects an upstream side and a downstream side with respect to the throttle valve of the air passage;
The outboard motor according to claim 4, wherein the idle speed control unit attached to an upper portion of the throttle body is configured to adjust a flow rate of air in the bypass air passage. A vapor separator tank for separating fuel vapor supplied to the engine from liquid fuel;
6. The outboard motor according to claim 5, wherein the vapor of fuel separated in the vapor separator tank is configured to escape upstream of the throttle valve of the throttle body. The throttle body further includes a relief hole provided on the upstream side of the throttle valve,
The outboard motor according to claim 6, wherein the vapor of the fuel separated in the vapor separator tank is configured to escape to the throttle body through the escape hole. A vapor separator tank for separating fuel vapor supplied to the engine from liquid fuel;
An intake pipe disposed at one end of the engine and connected to the throttle body at the other end along the side of the engine;
The outboard motor according to any one of claims 4 to 7, wherein the vapor separator tank is disposed between the engine and the intake pipe in plan view. A holding member that holds the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit;
The outboard motor according to any one of claims 4 to 8, wherein the holding member is attached to an upper portion of the throttle body.   The outboard according to claim 9, wherein the holding member is formed by resin molding so as to integrally hold the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit. Machine. An engine control unit for electrically controlling the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, and the idle speed control unit;
The holding member holds one connector for electrically connecting the throttle opening sensor, the intake air temperature sensor, the intake pressure sensor, the idle speed control unit, and the engine control unit. The outboard motor according to claim 9 or 10. The holding member is formed in a flat plate shape,
The upper part of the throttle body has a flat surface corresponding to the flat holding member,
The outboard according to any one of claims 9 to 11, wherein the holding member and the throttle body are fixed at a plurality of locations in a state where the holding member is disposed on a flat surface of the throttle body. Machine. A first groove that is electrically connected to the intake pressure sensor and a second groove that is provided in the vicinity of the first groove are formed on the surface of the holding member on the throttle body side,
The flat surface of the throttle body is formed with a third groove and a hole connected to the air passage,
In a state where the holding member and the throttle body are fixed, the hole and the third groove are electrically connected via the second groove, and the first groove and the second groove are the third groove. The outboard motor according to claim 12, wherein an air conduction path that connects the intake pressure sensor and the air passage is configured by conducting through the air passage. The throttle valve includes a valve plate and a valve shaft that extends in a vertical direction from a lower part to an upper part of the throttle body and rotatably supports the valve plate;
The outboard motor according to any one of claims 1 to 13, wherein a rotation angle of the valve shaft is detected by a throttle opening degree sensor attached to an upper portion of the throttle body.

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