JP4554475B2 - Throttle device and motorcycle - Google Patents

Description

  The present invention relates to a throttle device that detects an intake pressure in an intake cylinder with a pressure sensor via a pressure guide pipe, and a motorcycle including the same.

  Some conventional motorcycles have a throttle device that is connected to an intake port of an engine and adjusts an intake air amount by opening and closing a throttle valve (see Patent Document 1). In such a throttle device, one end of a rubber pipe is connected to a throttle body that forms an internal passage, the intake pressure in the internal passage is taken out, and the other end of the rubber pipe is connected to a pressure sensor. What detects a pressure is known (refer patent document 2).

For example, the throttle device 1 shown in FIG. 8 includes a throttle body 4 in which a plurality of intake cylinder portions 2A to 2D arranged in a row are connected by a spacer portion 6 at a predetermined interval. Disc-shaped throttle valves 3A to 3D are respectively disposed in the internal passages of the intake cylinder portions 2A to 2D. The throttle valves 3A to 3D pass through the intake cylinder portions 2A to 2D and the spacer portion 6, respectively. The throttle shaft 5 is fixed to be opened and closed as the throttle shaft 5 rotates. On one side (lower side in the figure) of the throttle body 4, the branch ends of the rubber pipes 7 are connected to the intake cylinder portions 2 </ b> A to 2 </ b> D, respectively, and the merging ends of the rubber pipes 7 pass through the outside of the throttle body 4. It is guided to the other side (the upper side in the figure) of the throttle body 4 and connected to a pressure sensor 8 attached to the other side of the throttle body 4. That is, when the pressure sensor 8 is provided on the opposite side of the position where the branch end of the rubber pipe 7 is connected for reasons of layout or the like, the joining end of the rubber pipe 7 bypasses the outside of the throttle body 4. It is led to the pressure sensor 8.
JP 2002-129987 A JP 2005-188408 A

  However, in the throttle device 1 shown in FIG. 8, the rubber pipe 7 that extracts the intake pressure in the intake cylinder portions 2 </ b> A to 2 </ b> D of the throttle body 4 is guided to the pressure sensor 8 by bypassing the outside of the throttle body 4. In addition, the rubber pipe 7 becomes long. When the rubber pipe 7 becomes longer and the intake pressure sampling passage becomes longer, fluctuations in the intake pressure in the intake cylinders 2A to 2D are not easily transmitted to the pressure sensor 8, and the detection accuracy of the intake pressure is improved. There is a limit to doing this.

  Accordingly, an object of the present invention is to provide a throttle device capable of improving the detection accuracy of the intake pressure in the throttle body.

The present invention has been made in view of the above-described circumstances, and a throttle device according to the present invention includes a plurality of intake cylinder portions arranged in a line and the intake cylinder in order to adjust the intake air flow rate to the engine. A throttle valve disposed in an internal passage of the cylinder part; a throttle shaft that supports the throttle valve and rotatably passes through the intake cylinder part and extends in the arrangement direction of the intake cylinder part; and the adjacent intake cylinder a throttle body and a spacer portion in which the throttle shaft is integrally erection is rotatably penetrate housed between parts, said wall portion of the intake pipe portion so as to communicate with the internal passage of the inlet pipe portion one end is connected, the comprises a Shirube圧pipe derived in one side of the throttle body, and a pressure sensor for detecting a disposed on the other side intake pressure of the throttle body, the The pacer unit, through holes are formed, said Shirube圧pipe, from one side of the throttle body passes between the adjacent by passing through the through hole the inlet pipe portion on the other side and the other end portion to the pressure sensor derived by are connected.

In this way, the pressure guiding pipe is passed between adjacent intake cylinders and guided from one side of the intake cylinder group to the other side, so that the pressure guiding pipe can be used as a pressure sensor without bypassing the outside of the intake cylinder group. Connected. Therefore, the pressure guiding pipe that is the sampling passage for the intake pressure can be shortened, and the fluctuation of the intake pressure in the intake cylinder is appropriately transmitted to the pressure sensor, thereby improving the detection accuracy of the intake pressure. Further, since the pressure guiding pipe passes through a through hole formed in the spacer portion of the throttle body and is guided from one side of the throttle body to the other side, the intermediate portion of the pressure guiding pipe is guided by the through hole and guided. The number of members (clamps and the like) for positioning the pressure pipe can be reduced, and the throttle body itself can be reduced in weight because the through hole is formed in the throttle body.

The throttle valve, and a second throttle valve disposed upstream of said first throttle valve in the first throttle valve and in the inlet pipe section disposed in the inlet pipe portion, said throttle shaft , the intake pipe at the first and the throttle shaft, before Symbol upstream side of the support the second throttle valve first throttle shaft that extends a first throttle valve in the direction of arrangement of the inlet pipe section and supports and a second throttle shaft that extends in the arrangement direction of parts, said through-hole is not formed between the axial line of the said the axial line of the first throttle shaft second throttle shaft Also good.

  In this case, the first throttle shaft provided on the intake downstream side is guided to the substantially central position in the intake direction between the axial center line of the second throttle shaft provided on the intake upstream side. Since it passes through the pressure pipe, it is possible to route the pressure guiding pipe without protruding up and down in the intake direction.

A plurality of injectors for injecting fuel into internal passages in the plurality of intake cylinders; and a driving device for rotating the throttle shaft. The pressure guiding pipe has a plurality of branched ends at the plurality of suction ports. The cylinder portion is connected to a wall portion on one side of the throttle body, and the plurality of injectors are connected to a wall portion on one side of the throttle body among the plurality of intake cylinder portions, respectively, and the pressure The sensor is disposed on the other side of the throttle body, and the pressure guiding pipe merges on one side of the throttle body at an intermediate portion from the plurality of one end portions toward the other end portion, and a portion after the merge other There passed on the other side of the throttle body and the through hole from one side of the throttle body, the driving device, from the throttle body It may be provided so as to protrude toward the side.

The spacer portion may be shorter than the intake cylinder portion in the intake flow direction, and may be connected to an intermediate portion of the intake cylinder portion in the intake flow direction.

The present invention is the motorcycle throttling device is connected to the intake port of the engine, the throttle device, adjusting a plurality of inlet pipe portion which is arranged in a row, the intake air flow to the engine Adjacent to a throttle valve disposed in the internal passage of the intake cylinder portion, and a throttle shaft that supports the throttle valve and rotatably passes through the intake cylinder portion and extends in the arrangement direction of the intake cylinder portions A throttle body having a spacer portion, which is integrally installed between the intake cylinder portions and in which the throttle shaft is rotatably inserted and received, and the plurality of intake valves so as to communicate with an internal passage of the intake cylinder portion. the wall portion of the vehicle body rearward of the cylinder portion, branched and Shirube圧pipe having a plurality of end portions are connected respectively, intake pressure the disposed in the vehicle body forward of the throttle body A pressure sensor for detecting, by injecting fuel into the internal passageway of said plurality of inlet pipe portion, and a plurality of injectors each connected to the wall portion of the vehicle body rearward of said plurality of inlet pipe portion, the spacer A through hole is formed in the portion, and the pressure guiding pipe joins at the rear side of the throttle body at an intermediate portion from the one end portion toward the other end portion, and a portion after the joining is formed The through hole passes from the rear to the front in the vehicle body direction, and the other end is connected to the pressure sensor .

As is apparent from the above description, according to the present invention, the intake pipe is passed between the adjacent intake cylinder portions and guided from one side of the intake cylinder group to the other side, so that the intake pressure sampling passage is provided. A certain pressure guiding pipe can be shortened. Therefore, fluctuations in the intake pressure of the throttle device are appropriately transmitted to the pressure sensor, and the intake pressure can be accurately detected by the pressure sensor. Further, since the pressure guiding pipe passes through a through hole formed in the spacer portion of the throttle body and is guided from one side of the throttle body to the other side, the intermediate portion of the pressure guiding pipe is guided by the through hole and guided. The number of members (clamps and the like) for positioning the pressure pipe can be reduced, and the throttle body itself can be reduced in weight because the through hole is formed in the throttle body.

  Embodiments according to the present invention will be described below with reference to the drawings. The direction concept used in the following description is based on the direction seen from a rider (not shown) riding the motorcycle.

  FIG. 1 is a side view of a motorcycle 10 according to an embodiment of the present invention. As shown in FIG. 1, a motorcycle 10 includes a front fork 11 provided in a substantially vertical direction with a predetermined caster angle, and a front wheel 12 as a steering wheel is rotatably supported below the front fork 11. Has been. A bar-type steering handle 13 is attached to the upper portion of the front fork 11 via a steering shaft (not shown). The steering shaft is pivotally supported by a head pipe 17 constituting a frame, and the front wheel 12 is steered in a desired direction by the rider swinging the steering handle 13 to the left and right.

  A pair of left and right main frames 23 extend rearward from the head pipe 17 while being slightly inclined downward, and a pair of left and right pivot frames 14 are connected to the rear portion of the main frame 23. A front part of a swing arm 15 extending substantially in the front-rear direction is pivotally supported on the pivot frame 14, and a rear wheel 16, which is a drive wheel, is rotatably supported on the rear part of the swing arm 15. A fuel tank 21 is provided behind the steering handle 13, and a seat 22 for riding a driver is provided behind the fuel tank 21.

  Between the front wheels 12 and the rear wheels 16, a parallel four-cylinder engine 18 is mounted in a state supported by the main frame 23 and the pivot frame 14. A quadruple throttle device 19 arranged inside the main frame 23 is connected to the intake port side of the engine 18. An air cleaner box 20 disposed below the fuel tank 21 is connected to the upstream side of the throttle device 19 and is configured to take in outside air using traveling wind pressure (ram pressure) from the front. A cowling 44 is provided so as to cover the engine E and the like from the front of the vehicle body to both sides of the vehicle body.

  FIG. 2 is a plan view of the throttle device 19. FIG. 3 is a rear view showing the configuration of the throttle device 19 shown in FIG. 2 when viewed from the direction of arrow III. FIG. 4 is a front view showing the configuration of the throttle device 19 shown in FIG. 2 when viewed from the direction of the arrow IV. FIG. 5 is a side view showing the configuration of the throttle device 19 shown in FIG. 2 when viewed from the direction of the arrow V. 6 is a cross-sectional view of the throttle device 19 shown in FIG. 2 taken along line VI-VI.

  As shown in FIGS. 2 to 4, the throttle device 19 includes a throttle body (intake cylinder group) 24 having four first to fourth intake cylinder portions (intake cylinders) 25A to 25D arranged in order from left to right. I have. The upstream openings 27A to 27D of the first to fourth intake cylinder portions 25A to 25D are connected to the air cleaner box 20 (FIG. 1), and the downstream openings 28A to 28D are connected to the intake port of the engine 18 (FIG. 1). Is done. A first spacer portion 26A is integrally connected between the first intake cylinder portion 25A and the second intake cylinder portion 25B, and between the third intake cylinder portion 25C and the fourth intake cylinder portion 25D. In addition, the second spacer portion 26B is integrally connected. The first spacer portion 26A and the second spacer portion 26B are shorter than the first to fourth intake cylinder portions 25A to 25D in the vertical direction of the intake air flow direction, and the first to fourth intake cylinder portions 25A to 25D are vertically aligned. It is connected to the middle part.

  The first spacer portion 26A includes a connecting portion 66 having a plate-like portion 66a that forms a plane in the vertical and horizontal directions between the accommodation locations of the left main throttle shaft 31A and the left sub throttle shaft 32A. Reinforcing portions 67 and 68 are provided that are arranged vertically and form a plane in the front-rear and left-right directions orthogonal to these. The second spacer portion 26B includes a connecting portion 69 having a plate-like portion 69a that forms a plane in the vertical and horizontal directions between the accommodation locations of the right main throttle shaft 31B and the left sub throttle shaft 32B, and above and below the connecting portion 69. Reinforcing portions 70 and 71 that are arranged and form planes in the front-rear and left-right directions perpendicular to these are provided.

  As shown in FIG. 4, the left main throttle shaft 31A is rotatable downstream of the first intake cylinder portion 25A and the second intake cylinder portion 25B and the plate-like portion 66a of the first spacer portion 26A connecting them. The left sub-throttle shaft 32 </ b> A is rotatably disposed in the left and right direction so as to be able to pass through in the left and right directions. Further, the right main throttle shaft 31B is rotatably disposed on the downstream side in the left and right directions through the third intake cylinder portion 25C and the fourth intake cylinder portion 25D and the plate-like portion 69a of the second spacer portion 26B connecting them. In addition, the right side sub-throttle shaft 32B is rotatably disposed in the left and right directions on the upstream side. As representatively shown in FIG. 6, in the internal passage of the intake cylinder portion 25A, a disc-shaped main throttle valve 29 supported by the left main throttle shaft 31A is disposed on the downstream side, and the left sub throttle shaft 32A. A disc-shaped sub-throttle valve 30 supported on the upstream side is disposed on the upstream side. The same applies to the other intake cylinder portions 25B to 25D.

  As shown in FIGS. 3 and 4, the left main throttle shaft 31A and the right main throttle shaft 31B rotate in synchronization with the downstream side of the space between the second intake cylinder portion 25B and the third intake cylinder portion 25C. A tuning member 37 is provided for connection. Further, on the upstream side of the space between the second intake cylinder portion 25B and the third intake cylinder portion 25C, a driving device 38 that rotates the left sub-throttle shaft 32A and the right sub-throttle shaft 32B in synchronization is provided on the front side. It is provided in a protruding state. As shown in FIG. 2, a motor 40, a first gear 41 provided on a drive shaft of the motor 40, a second gear 42 that transmits the rotational power of the first gear 41, and a case 39 of the drive device 38 A third gear 43 is provided. The third gear 43 is connected to the left sub-throttle shaft 32A and the right sub-throttle shaft 32B, so that the rotational power of the motor 40 is transmitted to the left sub-throttle shaft 32A and the right sub-throttle shaft 32B.

  As shown in FIG. 5, a main throttle pulley 49 connected to the left main throttle shaft 31 </ b> A shown by a broken line is provided at the left end of the throttle body 24, and the main throttle pulley 49 is a throttle of the steering handle 13. It is connected via a grip and a cable (not shown). That is, the main throttle pulley 49 is rotated according to the amount of rotation of the throttle grip, and the main throttle valve 29 (FIG. 6) is opened and closed.

  In the main throttle pulley 49, a first contact portion 49a and a second contact portion 49b protrude in the radial direction. The main throttle pulley 49 is urged by a spring 56 (see FIGS. 2 and 3) to bring the second contact portion 49 b into contact with the idling adjustment member 55. The idling adjusting member 55 is inserted into the tube 64 and the cable 63 is inserted into the tube 64. By turning a screw portion 65 provided at the rear end, the idling adjustment member 55 advances and retreats in a state in which the tip 63a of the cable 63 is in contact with the second contact portion 49b. In addition, the valve angle in the fully closed state of the main throttle valve 29 can be adjusted. Above the main throttle pulley 49, a first link 50 connected to the sub-throttle shaft 32A indicated by a broken line in FIG. 5 is provided, and a second link 51 that swings in conjunction with the first link 50 is provided. It is attached to the wall of the throttle body 24 via a spring 52 (see FIG. 3). An adjustment bolt 53 is attached to the second link 51 so as to face the first contact portion 49a.

  With such a configuration, when the engine 18 is cold-started, the sub-throttle valve 30 is rotated by the drive device 38, so that the first link 50 and the second link 51 swing and the tip of the adjustment bolt 53 53a contacts the first contact portion 49a. Then, the first abutting portion 49a is moved clockwise by the adjustment bolt 53 in the left side view, so that the main throttle pulley 49 is rotated by a small angle to give the main throttle valve 29 an opening necessary for first idling. .

  As shown in FIG. 4, at the right end of the throttle body 24, a main position sensor 35 for detecting the rotation angle of the left main throttle shaft 31A and the right main throttle shaft 31B is provided, and the right sub throttle shaft 32A and the right side A sub position sensor 36 for detecting the rotation angle of the sub throttle shaft 32B is provided. In addition, injectors 33 for fuel injection are respectively attached to the rear sides of the first to fourth intake cylinder portions 25A to 25D, and fuel supply pipes 34 extending in the left-right direction are provided at the upper ends of the injectors 33, respectively. It is connected.

  As shown in FIGS. 3 and 4, the plate-like portions 66a and 69a of the first spacer portion 26A and the second spacer portion 26B include the axis L1 of the left and right main throttle shafts 31A and 31B and the left and right sides. Through holes 47 and 48 are provided at a substantially central position between the sub-throttle shafts 32A and 32B and the axis L2. As shown in FIG. 2, a bracket 45 protruding toward the left side where the first spacer portion 26A is located is attached to the front side of the second intake cylinder portion 25B, and the pressure sensor 46 is screwed to the tip of the bracket 45. It is fixed.

  As shown in FIG. 6, a protrusion 59 having a communication passage 59a communicating with the internal passage is provided on the outer wall of the first intake cylinder portion 25A, and one end of the first pipe portion 60a of the pressure guiding pipe 60 to be described later is connected. The projection 59 is connected to communicate with the passage 59a. Although FIG. 6 shows the first intake cylinder portion 25A as a representative, the same applies to the second to fourth intake cylinder portions 25B to 25D.

FIG. 7 is a plan view schematically showing the throttle device 19 shown in FIG. 2 and shows the routing of the pressure guiding pipe 60. As shown in FIG. 7, on the rear side of the first to fourth intake cylinder portions 25A to 25D, one end of a flexible pressure guiding pipe 60 (for example, a rubber pipe or the like) that communicates with the internal passage. (The branch end) is connected, and the other end (joining end) of the pressure guiding pipe 60 is guided to the front side of the throttle body 24 by passing through the through hole 47 as a pipe passage portion and connected to the pressure sensor 46. (See also FIGS. 2 and 3)
Specifically, one ends of first to fourth pipe portions 60a to 60d constituting the pressure guiding pipe 60 are connected to the first to fourth intake cylinder portions 25A to 25D, respectively. The other ends of the first pipe portion 60a and the second pipe portion 60b are connected to the first joint portion 60e, and the other ends of the third pipe portion 60c and the fourth pipe portion 60d are connected to the second joint portion 60g. ing. One end of a fifth pipe portion 60f is connected to the first joint portion 60e, and one end of a sixth pipe portion 60h is connected to the second joint portion 60g. The other ends of the fifth pipe portion 60f and the sixth pipe portion 60h are connected to the third joint portion 60i, and one end of the seventh pipe portion 60j is connected to the third joint portion 60i. The seventh pipe portion 60j passes through the through hole 47 of the first spacer portion 26A as a pipe passage portion, is guided from the rear side to the front side of the throttle body 24, and is connected to the pressure sensor 46. That is, the pressure guiding pipe 60 joins the intake pressures taken out from the first to fourth intake cylinder portions 25A to 25D into one and averages them, and then guides them to the pressure sensor 46.

  The fourth pipe part 60d and the sixth pipe part 60h are tied to the fuel supply pipe 34 by band clamps 61 and 62 (see FIGS. 2 and 3). The pressure sensor 46 is connected to an ECU (not shown) via an electric wire.

  With the above configuration, even if the pressure guiding pipe 60 is attached to the rear side of the throttle body 24 and the pressure sensor 46 is attached to the front side of the throttle body 24, the pressure guiding pipe 60 is connected to the first spacer portion. By guiding through the through hole 47 of 26A from the rear side of the throttle body 24 to the front side, it is not necessary to route the pressure guiding pipe 60 around the outside of the throttle body 24. Therefore, the pressure guiding pipe 60, which is a sampling passage for the intake pressure in the first to fourth intake cylinder portions 25A to 25D, can be shortened, and the intake pressure in the first to fourth intake cylinder portions 25A to 25D varies. Etc. are accurately transmitted to the pressure sensor 46, and the detection accuracy of the intake pressure is improved.

  Further, since the seventh pipe portion 60j of the pressure guiding pipe 60 is guided to the inner peripheral edge of the through hole 47 by passing through the through hole 47, it is not necessary to position the seventh pipe portion 60j, and the pressure guiding pipe 60 is removed. It is possible to reduce the number of band clamps for holding. Further, since the two through holes 47 and 48 are formed in the throttle body 24, there is an advantage that the throttle body 24 itself is reduced in weight.

  Further, the pressure sensor 46 is attached to the second intake cylinder portion 25B adjacent to the through hole 47 through which the pressure guiding pipe 60 passes, and the bracket 45 for attaching the pressure sensor 46 to the second intake cylinder portion 25B is the through hole 47. The pressure guide pipe 60 (seventh pipe portion 60j) between the through hole 47, which is a pipe passage portion, and the pressure sensor 46 is shortened to detect the intake pressure. The accuracy is further improved.

  As described above, the throttle device and the motorcycle according to the present invention have an excellent effect of improving the detection accuracy of the intake pressure, and are suitable for application to such a motorcycle.

1 is a side view of a motorcycle according to an embodiment of the present invention. Fig. 2 is a plan view of a throttle device mounted on the motorcycle shown in Fig. 1. FIG. 3 is a rear view of the throttle device shown in FIG. 2 as viewed from the direction of arrow III. It is the front view seen from the IV arrow direction of the throttle device shown in FIG. It is the left view seen from the V arrow direction of the throttle device shown in FIG. FIG. 6 is a cross-sectional view of the throttle device shown in FIG. 2 taken along line VI-VI. FIG. 3 is a plan view schematically showing the throttle device shown in FIG. 2. It is the top view which represented the conventional throttle device typically.

Explanation of symbols

10 Motorcycle 18 Engine 19 Throttle device 20 Air cleaner box 24 Throttle body (intake cylinder group)
25A-25D Intake cylinder (intake cylinder)
26A, 26B Spacer 29 Main throttle valve (first throttle valve)
30 Sub-throttle valve (second throttle valve)
31A Left main throttle shaft (first throttle shaft)
31B Right main throttle shaft (first throttle shaft)
32A Left sub-throttle shaft (second throttle shaft)
32B Right sub-throttle shaft (second throttle shaft)
33 Injector 38 Drive device 46 Pressure sensor 47 Through hole 60 Pressure guiding pipe

Claims (5)

Rotation and a plurality of inlet pipe portion which is arranged in a row, and a throttle valve disposed in the internal passage of the inlet pipe section in order to adjust the intake air flow to the engine, a supporting the throttle valve the intake tube portion A throttle shaft that freely passes through and extends in the direction of arrangement of the intake cylinder portions, and a spacer portion that is integrally constructed between the adjacent intake cylinder portions and in which the throttle shaft is rotatably passed and received. A throttle body having ,
The one end is connected to the wall of the inlet pipe portion so as to communicate with the internal passage of the intake pipe portion, and Shirube圧pipe derived in one side of said throttle body,
A pressure sensor disposed on the other side of the throttle body for detecting intake pressure,
A through hole is formed in the spacer portion,
The Shirube圧pipe and the other end connected to one said from the side is led to the other side pressure sensor of the throttle body passes between the adjacent by passing through the through hole the inlet pipe portion A throttle device characterized by that. The throttle valve, and a second throttle valve disposed upstream of said first throttle valve in the first throttle valve and in the inlet pipe section disposed in the inlet pipe portion,
The throttle shaft, the first and the first throttle shaft that extends in the arrangement direction of the inlet pipe portion supporting the throttle valve, before Symbol upstream side of the support the second throttle valve the first throttle shaft in a second throttle shaft that extends in the arrangement direction of the inlet pipe portion,
2. The throttle device according to claim 1, wherein the through hole is formed between an axial center line of the first throttle shaft and an axial center line of the second throttle shaft. A plurality of injectors for injecting fuel into internal passages in the plurality of intake cylinders; and a drive device for rotating the throttle shaft,
The pressure guiding pipe has a plurality of branched one ends connected to a wall portion on one side of the throttle body among the plurality of intake cylinder portions,
The plurality of injectors are respectively connected to a wall portion on one side of the throttle body among the plurality of intake cylinder portions,
The pressure sensor is disposed on the other side of the throttle body,
The pressure guiding pipe merges on one side of the throttle body at an intermediate portion from the plurality of one end portions toward the other end portion, and a portion after the merge passes through the through hole from one side of the throttle body. Pass to the other side of the throttle body ,
The throttle device according to claim 1 , wherein the drive device is provided in a state of projecting from the throttle body toward the other side . 4. The throttle device according to claim 1 , wherein the spacer portion is shorter in the intake air flow direction than the intake tube portion, and is connected to an intermediate portion of the intake tube portion in the intake flow direction . Throttling device is a motorcycle which are connected to the intake port of the engine,
The throttle device is
A plurality of intake cylinders arranged in a line, a throttle valve arranged in an internal passage of the intake cylinder to adjust the intake flow rate to the engine, and the intake cylinder that supports the throttle valve and rotates the intake cylinder A throttle shaft that freely passes through and extends in the direction of arrangement of the intake cylinder portions, and a spacer portion that is integrally installed between the adjacent intake cylinder portions and in which the throttle shaft is rotatably accommodated. A throttle body having,
A pressure guiding pipe having a plurality of branched one ends connected to a wall portion on the rear side in the vehicle body direction of the plurality of intake cylinder portions so as to communicate with an internal passage of the intake cylinder portion;
A pressure sensor that is disposed in front of the throttle body in the vehicle body direction and detects intake pressure;
A plurality of injectors for injecting fuel into the internal passages in the plurality of intake cylinders and respectively connected to the rear wall of the plurality of intake cylinders in the vehicle body direction ;
A through hole is formed in the spacer portion,
The pressure guiding pipe joins at the rear side of the throttle body at an intermediate portion from the plurality of one end portions toward the other end portion, and the joined portion passes through the through hole from the rear to the front in the vehicle body direction. The other end is connected to the pressure sensor .

Images