JP4954613B2 - Scooter-type vehicle intake system - Google Patents

Description

  The present invention relates to an intake device for a unit swing type scooter type vehicle.

2. Description of the Related Art Conventionally, in a scooter type vehicle in which an engine having a cylinder axis arranged substantially horizontally and a power transmission mechanism are integrally assembled to constitute a power unit, and the power unit is swingably connected to a body frame, a fuel injection valve There is one in which a throttle body that is integrally provided is tilted forward and obliquely forward of the cylinder portion (see, for example, Patent Document 1).
JP 2003-335282 A

However, in the above conventional configuration, since an air cleaner or the like is further arranged in front of the throttle body, there is a problem that a space required for escape of each part when the power unit is swung is increased.
Accordingly, the present invention provides an intake device for a scooter type vehicle that can suppress the space required for the escape of each part when the power unit is swung.

As a means for solving the above problems, the invention described in claim 1 is that the engine (E) and the power transmission device (M) having the cylinder axis arranged substantially horizontally are integrally assembled to constitute a power unit (U). The power unit (U) is swingably connected to the vehicle body frame (F), a throttle body (55) is disposed immediately above the cylinder portion (22), and an air cleaner is disposed behind the throttle body (55). (56) is arranged, and the intake passage (58) from the air cleaner (56) to the combustion chamber (37) through the throttle body (55) and the intake port (38) on the cylinder part (22) upper side is shown in a side view. The cylinder portion (22) has a U-shape that opens toward the base end side, and a fuel injection valve (59) that injects fuel into the intake passage (58) is provided as the throttle body (55). In the provided scooter type air intake device, the fuel injection valve (59) is disposed on the throttle body (55) opposite to the cylinder portion (22) with the intake passage (58) in the throttle body (55) interposed therebetween. ) And an injection port (60) of the fuel injection valve (59) is opened from the upper inner wall of the throttle body (55) to form a U-shape of the intake passage (58). The front end of the intake port is directed so that fuel hits it, and the upper end of the intake port is located at the U-shaped front end of the intake passage .
The invention described in claim 2 is characterized in that an article storage box (18) is arranged above the power unit (U).
According to a third aspect of the present invention, the injection port (60) of the fuel injection valve (59) is on the intake downstream side of the rotation center of the valve (61) in the throttle body (55), and the valve rotates. It arrange | positions in the said rotation center side rather than the downstream end of a range, It is characterized by the above-mentioned.
The invention described in claim 4 is characterized in that the throttle body (55) is arranged in a U-shaped substantially horizontal portion of the intake passage (55).
According to a fifth aspect of the present invention, an insulator (55a) connected to the front end of the throttle body (55) to constitute the intake passage (55) is formed at a U-shaped front end portion of the intake passage (55). It is connected to a cylinder head (33) of the cylinder part (22).
In the invention described in claim 6, the engine (E) and the power transmission device (M) in which the cylinder axis is disposed substantially horizontally are integrally assembled to constitute a power unit (U), and the power unit (U) The vehicle body frame (F) is swingably connected, and a throttle body (55) is disposed immediately above the cylinder portion (22), and an air cleaner (56) is disposed behind the throttle body (55). An intake passage (58) from the air cleaner (56) to the combustion chamber (37) through the throttle body (55) and the intake port (38) on the upper side of the cylinder portion (22) has a cylinder portion (22) base in side view. An intake of a scooter type vehicle having a U-shape that opens toward the end side and a fuel injection valve (59) that injects fuel into the intake passage (58) is provided in the throttle body (55). In the apparatus, the fuel injection valve (59) is tilted to the upper side of the throttle body (55) opposite to the cylinder part (22) across the intake passage (58) in the throttle body (55). The fuel injection valve (59) has an injection port (60) opened from the upper inner wall of the throttle body (55), so that fuel can flow into the U-shaped front end inner wall of the intake passage (58). It is directed to strike the positioned at the front end portion of the U-shaped upper end portion of the intake port is the intake passage, the cylinder portion temperature sensor (103) is viewed from the side (22) and said throttle body (55) It is characterized by being arranged in a state substantially parallel to the throttle body (55).
According to a seventh aspect of the present invention, the cylinder part (22) includes a cylinder block (32) and a cylinder head (33), and the water temperature sensor (103) is connected to the intake passage of the cylinder head (33). (58) It is inserted in the water jacket (102) formed inside the U-shape.
According to an eighth aspect of the present invention, the water temperature sensor (103) is attached to a sensor attachment portion (104) provided in the cylinder block (32), and is attached to a water jacket (102) of the cylinder head (33). It is characterized by being inserted.
The invention described in claim 9 is characterized in that the water temperature sensor (103) has an acute angle with respect to the cylinder axis in a side view.
The invention described in claim 10 is characterized in that the water temperature sensor (103) overlaps the cylinder block (32) of the cylinder part (33) in a side view.

According to the invention described in claims 1 to 10 , an intake system structure is provided by disposing a throttle body directly above a cylinder portion of an engine having a cylinder axis disposed substantially horizontally and disposing an air cleaner behind the throttle body. The entire power unit including the object becomes compact, and the space required for escape of each part when the power unit is swung can be suppressed. In addition, by forming the intake passage in a U-shape when viewed from the side, the length of the entire intake passage is ensured, and by disposing the fuel injection valve in the throttle body, the distance from the fuel injection valve to the combustion chamber is also increased. It is ensured and the amount of fuel blown off during the valve overlap of the engine (the state where both intake and exhaust valves are open) can be reduced.

  According to the second aspect of the present invention, the fuel injection valve is inclined and arranged on the opposite side (that is, the upper side) of the cylinder portion in the throttle body, so that the fuel injection valve stands up and down. Compared to the case, the upward protrusion amount is suppressed, and the capacity of the article storage box can be ensured to be large.

  According to the third aspect of the present invention, the injection port of the fuel injection valve is disposed on the intake downstream side of the valve and on the intake upstream side as much as possible, thereby further ensuring the distance from the fuel injection valve to the combustion chamber. be able to. In addition, it becomes possible to inject fuel into the intake air that has a relatively high flow velocity immediately after the valve and becomes turbulent, and it is possible to promote homogeneous mixing of the fuel and the intake air.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, the arrow LH indicates the left side of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  In the scooter type motorcycle 1 that is a low-floor type vehicle shown in FIG. 1, the vehicle body frame F includes a head pipe 13 at the front end, and a front fork 11 and a steering handle 12 that pivotally support the front wheel WF are mounted on the head pipe 13. It is supported so that it can be turned. Also, on the lower rear side of the vehicle body frame F, an integral swing type power unit (hereinafter referred to as an engine E) which is a motor of the motorcycle 1 is disposed at the front and an axle S of the rear wheel WR which is a drive wheel is disposed at the rear. U) (referred to as a power unit).

  A front upper side of the power unit U is supported by a rear portion of the vehicle body frame F through a suspension link (not shown) so as to be vertically swingable. On the other hand, the rear end portion of the power unit U is supported by the rear end portion of the vehicle body frame F via a rear cushion 7 that is a shock absorber. Such a power unit U can swing up and down with the rear wheel WR about the suspension link as a pivot, and constitutes a so-called unit swing type rear suspension.

  The vehicle body frame F includes a pair of left and right upper down frames 14 extending rearward and downward from the head pipe 13, and a pair of left and right extending below the upper down frame 14 and extending rearwardly downward from the head pipe 13 and then bent backward. And a lower down frame 15. The rear portion of the lower down frame 15 is a rear inclined portion 15a that is bent and extended rearward, and the rear end of the upper down frame 14 is joined to the lower side of the rear inclined portion 15a.

  The front ends of a pair of left and right seat rails 16 that are inclined to rise rearward are joined to the rear portion of the upper down frame 14. The seat rail 16 is inclined more gently than the rear inclined portion 15 a, and the upper end of the rear inclined portion 15 a is joined to the intermediate portion of the seat rail 16. Further, a bracing support frame 10 is provided between the rear portion of the seat rail 16 and the intermediate portion of the rear inclined portion 15a. The vehicle body frame F is mainly composed of the head pipe 13, the upper down frame 14, the lower down frame 15, the seat rail 16, and the support frame 10.

  The vehicle body frame F is covered with a vehicle body cover 19. A tandem occupant seat 20 is disposed on the rear portion of the vehicle body cover 19 so as to be openable and closable. An article storage box 18 that can store a helmet or the like is disposed below the passenger seat 20 and above the power unit U.

Referring to FIGS. 2, 3, and 4 together, the power unit U is formed by integrally combining a front engine E and a rear left power transmission device M.
The engine E is a water-cooled single-cylinder engine in which the rotation axis C1 of the crankshaft 31 is aligned in the left-right direction. The engine E is substantially horizontal with the cylinder portion 22 facing forward from the front end portion of the crankcase 21 (specifically, slightly forward) It is made to protrude (inclined upward). Hereinafter, the axis along the protruding direction of the cylinder part 22 will be described as a cylinder axis C2.

  The crankcase 21 is divided into left and right case halves 21a and 21b. The left case half 21a of the crankcase 21 has a left case main body 23a that extends rearward from the left side of the rear part and then extends rearward. It is integrally formed. The left case body 23a constitutes the transmission case 23 in the power transmission device M together with the left case cover 23b attached to the left side thereof. A right case cover 21 c is attached to the right side portion of the crankcase 21. Reference numeral 21d denotes a pump cover attached to the right outer side of the right case cover 21c, reference numeral 62 denotes an oil filter attached to the right outer side of the pump cover 21d, and reference numeral 54 denotes an oil cooler attached to the front end of the right case cover 21c. Show.

  The power transmission device M includes a belt-type continuously variable transmission mechanism 24 (see FIG. 1) in which an endless belt is wound around front and rear pulleys, and the output of the belt-type continuously variable transmission mechanism 24 is reduced to a rear output shaft ( And a gear type reduction mechanism 25 (see FIG. 3) for outputting to the axle S). The belt type continuously variable transmission mechanism 24 is accommodated across the transmission case 23 and the gear reduction mechanism 25 is accommodated inside the rear portion of the transmission case 23. A rear wheel WR is attached to the axle S that protrudes to the rear right side of the transmission case 23.

  A front end portion of an auxiliary arm 26 that extends forward and backward and supports the right end portion of the axle S is attached to the right side of the rear portion of the right case half 21b of the crankcase 21 (see FIG. 3). The auxiliary arm 26 and the transmission case 23 serve as left and right arms that support the rear wheel WR, and the entire power unit U can swing up and down together with the rear wheel WR. At the rear end portions of the transmission case 23 and the auxiliary arm 26, unit side cushion connecting portions 27 that pivotally support the lower end portions of the pair of left and right rear cushions 7 are respectively provided. The upper end portion of each rear cushion 7 is pivotally supported by the vehicle body side cushion connecting portion 17 at the rear end portion of the left and right seat rails 16.

With reference to FIG. 2, the cylinder portion 22 is attached to a cylinder block 32 attached to the front end portion of the crankcase 21, a cylinder head 33 attached to the front end portion of the cylinder block 32, and a front end portion of the cylinder head 33. Mainly the head cover 33a.
A cylinder bore 32a is formed in the cylinder block 32 along the cylinder axis C2, and a piston 34 is fitted in the cylinder bore 32a so as to be able to reciprocate. A small end portion of a connecting rod 35 is connected to the piston 34, and a large end portion of the connecting rod 35 is connected to a crank pin 31 a of the crankshaft 31. The crankshaft 31 has left and right journals 31c on the outer sides of the left and right crank webs 31b that support the crankpins 31a, and the left and right journals 31c are rotatable on the left and right bearing portions 36a and 36b of the crankcase 21 via metal bearings 36c. (See FIG. 4).

  The cylinder head 33 closes the front end opening of the cylinder bore 32a and forms a combustion chamber 37 together with the piston 34 at the top dead center. Here, the engine E is an OHC four-valve type, and two openings on the downstream side of the intake port 38 and two openings on the upstream side of the exhaust port 39 are formed in the roof forming portion of the combustion chamber 37 (see FIG. 8). The openings are opened and closed by an intake valve 41 and an exhaust valve 42, respectively.

  The stems of the valves 41 and 42 have a V-shape when viewed from the side and extend forward. A single camshaft 43 is disposed between the stems, and the camshaft 43 is cranked via a cam chain (not shown). It is rotationally driven together with the shaft 31. Due to the rotational drive of the camshaft 43, the intake side or exhaust side rocker arms 44, 45 straddling between the camshaft 43 and the upper ends of the stems of the valves 41, 42 are swung. By reciprocating, each opening of the ports 38 and 39 on the combustion chamber 37 side is opened and closed. A drive sprocket 31d for winding the cam chain disposed on the right side of the cylinder portion 22 is provided on the right side of the right journal 31c of the crankshaft 31 (see FIG. 4).

  A drive pulley 24 a of the belt type continuously variable transmission mechanism 24 is coaxially disposed at the left end portion of the crankshaft 31. On the other hand, referring to FIG. 4, the outer rotor 47 a of the generator 47 is coaxially disposed at the right end portion of the crankshaft 31. The outer rotor 47a has a cup shape that opens to the right, and is arranged so as to protrude rightward from the right side surface of the crankcase 21 and to enter the right case cover 21c that covers the right side surface. A stator coil 47b supported by the right case cover 21c is disposed in the outer rotor 47a.

  Above the crankshaft 31, a balancer shaft 48, which is a separate axis from the crankshaft 31, is provided. The balancer shaft 48 has a rotation axis parallel to the crankshaft 31, and rotates at a constant speed with the crankshaft 31 by engaging the driven gear 48 b at the right end with the drive gear 31 e of the crankshaft 31. The balancer weight 48a located in the middle of the balancer shaft 48 is provided so as to enter between the left and right crank webs 31b while avoiding the crank pin 31a. The balance range of the balancer weight 48a and the rotation range of the left and right crank webs 31b Wraps in some of these.

  Here, on the right side of the balancer shaft 48, a water pump 51 for circulating cooling water in the engine E is arranged. The water pump 51 is disposed between the right case cover 21c and the pump cover 21d, and the drive shaft 52 thereof is disposed coaxially with the balancer shaft 48. The drive shaft 52 extends inwardly in the left and right directions, and the balancer shaft. When the crankshaft 31 and the balancer shaft 48 are rotated, the water pump 51 is driven by being connected to the right end 48 so as not to be relatively rotatable. The casing 53 of the water pump 51 is formed by the right case cover 21c and the pump cover 21d.

Referring also to FIG. 5, the portion of the pump cover 21 d that forms the casing 53 is formed in a protruding shape that protrudes to the left and right, and a plurality of cooling water inflow / outflow hoses are connected around the protruding portion.
The oil cooler 54 attached to the front end portion of the right case cover 21c is a water-cooled type that uses cooling water supplied from the water pump 51, and protrudes forward along the cylinder axis C2 from the front end portion of the right case cover 21c. To be provided. In the oil cooler 54, the engine oil in the right case cover 21c is introduced from the base end side, and after the oil is cooled while passing through a predetermined path, the right case cover 21c is also inserted from the base end side. Returned in.

  As shown in FIGS. 1 and 2, a throttle body 55 as an intake system component is disposed above the cylinder portion 22 of the engine E, and the front end (downstream side) of the throttle body 55 is connected to the cylinder head 33 via an insulator 55a. Connected to the upstream opening of the upper intake port 38. An air cleaner 56 is disposed on the upper right side of the power unit U and behind the throttle body 55 (see FIG. 5), and the air cleaner 56 is connected to the rear end (upstream side) of the throttle body 55 via a connecting tube 56a. A base end of an exhaust pipe 57 is connected to the downstream opening of the exhaust port 39 below the cylinder portion 22, and the exhaust pipe 57 extends rearward while being bent around the engine E and is disposed on the right side of the rear wheel WR. 57a.

Here, the intake passage 58 from the air cleaner 56 to the downstream opening of the intake port 38 has a U-shape in a side view that opens toward the base end side (crankcase 21 side) of the cylinder portion 22.
Specifically, the throttle body 55 is disposed with the axis C3 of the intake passage 58 formed therein substantially horizontal (specifically, inclined slightly rearward), and the throttle body 55 front end and the intake port 38 are arranged. An insulator 55a that connects to the upstream opening is formed to curve the intake passage 58 that continues from the throttle body 55 downward, and the intake port 38 continues from the insulator 55a from the upstream opening to the downstream opening. The intake passage 58 is formed to bend obliquely downward and rearward.

  Referring also to FIG. 6, an injector 59 that injects fuel into the intake passage 58 is integrally attached to the throttle body 55. The injector 59 is disposed on the upper side of the throttle body 55 (in other words, on the side opposite to the cylinder portion 22 across the intake passage 58) so as to be inclined forward and downward with respect to the axis C3 of the throttle body 55. The injection port 60 is opened in the upper inner wall of the throttle body 55 so that the injection port 60 faces the intake passage 58.

  A disc-shaped throttle valve 61 that opens and closes an intake passage 58 inside the throttle body 55 is provided in the throttle body 55. The throttle valve 61 is pivotally supported by the throttle body 55 via a pivot shaft 61a that extends substantially in the left-right direction. When the throttle is open, the throttle valve 61 rotates counterclockwise in FIG. 6 in order to move the upper part forward and the lower part downward. To turn. Here, the injection port 60 that opens in the upper inner wall of the throttle body 55 in the injector 59 is on the downstream side of the intake air with respect to the rotation shaft 61a (rotation center) of the throttle valve 61 and is a range required for the rotation of the throttle valve 61. (Valve rotation range) H is located closer to the rotation shaft 61a than the intake downstream end T.

  Referring to FIG. 1, the passenger seat 20 is provided such that a rear passenger seat 20 b constituting the rear half is displaced in a stepped manner relative to a driver seat 20 a constituting the front half. For example, when the driver's seat 20a and the seat back 20c at the rear end thereof rotate via a hinge (not shown), it is possible to access the article storage box 18 provided across the front and rear of the passenger seat 20. Become. The bottom wall 18a of the article storage box 18 has a curved shape protruding upward below the driver's seat 20a so as to avoid the cylinder portion 22 and the throttle body 55 of the engine E, and is required when the power unit U swings up and down. The escape space for the engine E and intake system parts is secured.

Next, the periphery of the water jacket of the cylinder portion 22 will be described with reference to FIGS.
The cylinder block 32 is formed with a cylinder-side water jacket 101 so as to surround the outer periphery of the cylinder bore 32 a, and the cylinder head 33 is formed with a head-side water jacket 102 so as to surround each of the valves 41, 42. The cylinder-side water jacket 101 is annularly opened to the cylinder head 33 side at the mating surface 32 s of the cylinder block 32 with the cylinder head 33, while the head-side water jacket 101 is disposed on the mating surface 33 s of the cylinder head 33 with the cylinder block 32. A plurality of cylinder-side openings 102a are formed on the circumference centered on the cylinder axis C2, and the water jackets 101 and 102 communicate with each other by bringing the mating surfaces 32s and 33s into close contact with each other via a predetermined gasket. Thus, it becomes possible to distribute the cooling water.

  Here, on the right side of the upper wall of the cylinder block 32, for example, a water temperature sensor 103 for detecting the cooling water temperature in the cylinder head 33 is attached. The water temperature sensor 103 is attached to the sensor attachment portion 104 formed in the vicinity of the mating surface 32 s of the cylinder block 32 so as to be inserted from the base end side (crank case 21 side) of the cylinder portion 22. An axis line C5 (hereinafter referred to as a sensor axis line) C5 along the insertion direction of the water temperature sensor 103 is inclined with respect to the cylinder axis line C2 such that the cylinder head 33 side is closer to the cylinder inner side. The inclination angle of the sensor axis C5 with respect to the cylinder axis C2 is an acute angle.

  The tip end side in the insertion direction of the temperature sensor is a pin-shaped detection unit 103a along the sensor axis C5, and a thermistor is built in the detection unit 103a. A relatively large-diameter shaft portion 103b along the sensor axis C5 is connected to the proximal end side of the detection portion 103a, and a diameter-enlarged portion 103c is provided on the proximal end side of the shaft portion 103b. The connector 103d that protrudes toward the crankcase 21 along the sensor axis C5 is integrally held.

  The sensor mounting portion 104 forms a sensor insertion hole 104a along the sensor axis C5 and a sensor mounting seat surface 104b orthogonal to the sensor axis C5. A screw on the outer periphery of the shaft portion 103b is formed on a thread on the inner periphery of the sensor insertion hole 104a. The temperature sensor is fixed to the sensor mounting portion 104 by screwing the peaks and bringing the tip end surface of the enlarged diameter portion 103c into close contact with the mounting seat surface 104b. At this time, the water temperature sensor 103 is disposed in a dead space between the throttle body 55 and the cylinder block 32 located immediately above the water temperature sensor 103 and is disposed adjacent to the cylinder-side water jacket 101. Here, the axis C3 of the intake passage 58 in the throttle body 55 and the sensor axis C5 of the water temperature sensor 103 are substantially parallel.

  In the sensor mounting portion 104, the surface on the cylinder head 33 side constitutes a part of the mating surface 32 s of the cylinder block 32. Further, a seating portion 104c is formed at a portion of the sensor insertion hole 104a on the cylinder head 33 side while leaving the thread, and the mating surface 33a of the cylinder head 33 is connected to the seating portion 104c. Is formed with a sensor communication port 102b. Through this sensor communication port 102b, the detection unit 103a of the water temperature sensor 103 enters the head side water jacket 102, and the temperature of the cooling water in the head side water jacket 102 can be directly detected. The sensor communication port 102b and the seating portion 104c constitute a part of the head-side water jacket 102 across the cylinder head 33 and the cylinder block 32. The seal of the part is the both mating surfaces 32s, Good with a gasket between 33s.

  As described above, in the intake device in the above embodiment, the engine E and the power transmission device M in which the cylinder axis C2 is disposed substantially horizontally are integrally assembled to constitute the power unit U, and the power unit U is the vehicle body frame. The throttle body 55 is disposed directly above the cylinder portion 22 and an air cleaner 56 is disposed behind the throttle body 55. An intake passage 58 extending from the air cleaner 56 to the combustion chamber 37 through the throttle body 55 and the intake port 38 on the upper side of the cylinder portion 22 has a U shape that opens toward the base end side of the cylinder portion in a side view. An injector 59 for injecting fuel into the passage 58 has a cylinder sandwiching the intake passage 58 in the throttle body 55. The 22 is intended to be arranged inclined to a site on the opposite side.

  According to this configuration, the throttle body 55 is disposed immediately above the cylinder portion 22 of the engine E with the cylinder axis C2 disposed substantially horizontally, and the air cleaner 56 is disposed behind the throttle body 55, whereby the intake system structure The power unit U as a whole is compact, and the space required for the escape of each part when the power unit U swings can be suppressed. Further, by forming the intake passage 58 in a U-shape when viewed from the side, the entire length of the intake passage 58 is secured, and by disposing the injector 59 in the throttle body 55, from the injector 59 to the combustion chamber 37. The distance is also secured, and the amount of fuel blow-through during the valve overlap of the engine E can be reduced.

  Further, in the above intake structure, by placing the article storage box 18 above the power unit U, the injector 59 is inclined and arranged on the opposite side (that is, the upper side) of the cylinder portion 22 in the throttle body 55. As a result, the amount of upward protrusion can be suppressed as compared with the case where the injector 59 is erected vertically, and the capacity of the article storage box 18 can be secured large.

  Further, in the intake structure, the injection port 60 of the injector 59 is located on the downstream side of the intake side of the rotation shaft 61a of the throttle valve 61 and the downstream side end T of the valve rotation range H in the throttle body. By being arranged on the rotating shaft 61a side, the injection port 60 of the injector 59 is arranged on the intake downstream side of the throttle valve 61 and on the intake upstream side as much as possible, and the distance from the injector 59 to the combustion chamber 37 is increased. Furthermore, it can be secured. In addition, fuel is injected into the intake air, which has a relatively high flow velocity immediately after the throttle valve 61 and becomes turbulent, so that homogeneous mixing of the fuel and the intake air can be promoted.

1 is a left side view of a motorcycle according to an embodiment of the present invention. FIG. 3 is a left side view around the engine of the power unit of the motorcycle. It is a top view around the power unit. It is an expanded sectional view of the above-mentioned engine. It is the perspective view which looked at the power unit circumference from the left rear. It is a left view of the cylinder upper part of the said engine and the surroundings of an intake passage. It is the arrow view which looked at the cylinder block of the said engine from the crankcase side. It is the arrow view which looked at the cylinder head of the above-mentioned engine from the crankcase side.

Explanation of symbols

1 Motorcycle (scooter type vehicle)
F Body frame E Engine (Internal combustion engine)
M Power transmission device U Power unit (Swing unit)
C2 Cylinder axis 18 Article storage box 22 Cylinder part 37 Combustion chamber 38 Intake port 55 Throttle body 56 Air cleaner 58 Intake passage 59 Injector (fuel injection valve)
60 Injection port 61 Throttle valve (valve)
61a Rotating shaft (Rotating center)
H Valve rotation range T Downstream end

Claims (10)

The engine (E) with the cylinder axis arranged substantially horizontally and the power transmission device (M) are integrally assembled to form a power unit (U), which can swing on the body frame (F). The throttle body (55) is disposed immediately above the cylinder portion (22), and an air cleaner (56) is disposed behind the throttle body (55). The air cleaner (56) and the throttle body ( 55) and an intake passage (58) that reaches the combustion chamber (37) through the intake port (38) on the upper side of the cylinder part (22) and opens to the base end side of the cylinder part (22) in a side view. A scooter-type vehicle intake device having a shape and having a fuel injection valve (59) for injecting fuel into the intake passage (58) in the throttle body (55),
The fuel injection valve (59) is disposed on an upper side of the throttle body (55) opposite to the cylinder part (22) across the intake passage (58) in the throttle body (55). The fuel injection valve (59) has an injection port (60) opened from the upper inner wall of the throttle body (55) so that the fuel hits the U-shaped front end inner wall of the intake passage (58). An intake device for a scooter type vehicle , wherein the intake port is oriented and an upper end portion of the intake port is located at a U-shaped front end portion of the intake passage .   The intake device for a scooter type vehicle according to claim 1, wherein an article storage box (18) is disposed above the power unit (U).   The injection port (60) of the fuel injection valve (59) is located downstream of the rotation center of the valve (61) in the throttle body (55) and downstream of the downstream end of the valve rotation range. The air intake apparatus for a scooter type vehicle according to claim 1 or 2, wherein the air intake apparatus is disposed on a moving center side.   The air intake device for a scooter type vehicle according to claim 1, wherein the throttle body (55) is disposed in a substantially U-shaped horizontal portion of the intake passage (55).   An insulator (55a) connected to the front end of the throttle body (55) and constituting the intake passage (55) is a cylinder head of the cylinder portion (22) at the U-shaped front end of the intake passage (55). The air intake device for a scooter type vehicle according to claim 1, wherein the air intake device is connected to (33). The engine (E) with the cylinder axis arranged substantially horizontally and the power transmission device (M) are integrally assembled to form a power unit (U), which can swing on the body frame (F). In the scooter type vehicle intake device connected to the
A throttle body (55) is disposed immediately above the cylinder portion (22), and an air cleaner (56) is disposed behind the throttle body (55). The air cleaner (56) to the throttle body (55), and The intake passage (58) that reaches the combustion chamber (37) through the intake port (38) on the upper side of the cylinder portion (22) has a U-shape that opens toward the base end side of the cylinder portion (22) in a side view, the fuel injection valve (59) for injecting fuel into the intake passage (58), wherein is provided on the throttle body (55), the cylinder portion across the intake passage (58) in the throttle body (55) and (22) and is disposed inclined to a site on the opposite side, the injection port of the fuel injection valve (59) to (60), is opened from the top inner wall of the throttle body (55), said intake Is directed to impinge the fuel in the U-shaped front end inner wall of the passage (58), the upper end portion of the intake port is located at the front end of the U-shaped said intake passage, a water temperature sensor (103) is viewed from the side The scooter type vehicle air intake device is disposed between the cylinder portion (22) and the throttle body (55) in a state substantially parallel to the throttle body (55).   The cylinder part (22) has a cylinder block (32) and a cylinder head (33), and the water temperature sensor (103) is located inside the U-shape of the intake passage (58) of the cylinder head (33). The scooter type vehicle intake device according to claim 6, wherein the air intake device is inserted into a water jacket (102) formed in the vehicle.   The said water temperature sensor (103) is attached to the sensor attachment part (104) provided in the said cylinder block (32), and is penetrated by the water jacket (102) of the said cylinder head (33). Item 8. The scooter type vehicle intake device according to Item 7.   The intake device for a scooter type vehicle according to claim 6, wherein the water temperature sensor (103) has an acute angle with respect to the cylinder axis in a side view.   The scooter type vehicle intake device according to claim 6, wherein the water temperature sensor (103) overlaps the cylinder block (32) of the cylinder portion (33) in a side view.

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