JP4977654B2 - Internal combustion engine having a throttle valve device - Google Patents

Description

  The present invention relates to an internal combustion engine including an air intake device that takes in intake air and a throttle valve device that includes a throttle body that forms a throttle passage in which a throttle valve that is driven to open and close by an electric motor is disposed.

The internal combustion engine includes an air cleaner as an air intake device provided with an air intake port for taking in intake air, and a throttle valve device including a throttle body that forms a throttle passage in which the throttle valve is disposed. Those that are opened and closed by a motor are known. (For example, see Patent Document 1)
Also, in a V-type internal combustion engine, a throttle body of a throttle valve device is arranged between a pair of banks arranged in a V shape, and an air cleaner is attached to the throttle body on the inner surface of the vehicle body. ing. (For example, see Patent Document 2)
Japanese Patent No. 3422373 JP 2002-206460 A

In an internal combustion engine, in order to arrange an air cleaner and a throttle valve device as an air intake in a compact manner, when the air cleaner and the throttle valve device are arranged side by side in a passage center line direction parallel to the passage center line of the throttle passage, If an electric motor that opens and closes the throttle valve is arranged around the throttle body, the electric motor restricts the arrangement of the air intakes provided in the air cleaner, and it is difficult to arrange the electric motor around the throttle body in a compact manner. May be.
That is, with respect to the electric motor, generally, the dimension in the rotation center line direction parallel to the rotation center line of the rotation shaft is larger than the dimension in the radial direction centering on the rotation center line. For this purpose, the electric motor is arranged around the throttle body so that the minimum distance between the passage center line of the throttle passage and the rotation center line of the electric motor is reduced, thereby reducing the size of the throttle valve device including the electric motor. be able to. However, when an air intake port of the air cleaner is provided in the case wall on the electric motor side in the direction of the passage center line in the case of the air cleaner, the electric motor has its rotation center line at the rotation center line of the throttle valve, or When arranged so as to be parallel to a plane perpendicular to the passage center line, the electric motor rotates when viewed from a direction perpendicular to the passage center line so that the electric motor overlaps the passage center line. Since the center line is arranged so as to be orthogonal to the passage center line, when the electric motor is arranged compactly around the throttle body, the outside air flowing toward the air intake in the direction of the passage center line is directed to the electric motor. The amount of intake air from the air intake may decrease due to being disturbed by the air.In such a case, ensure the required amount of intake air. For, so that the arrangement of the inlet air is constrained by the arrangement of the electric motor. This means that the degree of freedom of arrangement of the electric motor is reduced in order to ensure a required amount of intake air at the air intake.
This restriction is further increased when the throttle valve device is disposed between a pair of banks of the V-type internal combustion engine because the arrangement of the air intake ports is limited by the pair of banks.

The present invention, all SANYO been made in view of such circumstances, to form an air intake device for an empty Kido inlet is provided, the throttle passageway throttle valve is arranged to be opened and closed driven by an electric motor In an internal combustion engine including a throttle valve device including a throttle body, the arrangement of the electric motor around the throttle body can be made compact while increasing the degree of freedom in the arrangement of the electric motor, and an air intake device by reducing the restrictions imposed by the electric motor for air intake arrangement provided in a child and allow ease of securing of the required intake air amount, a transmission device for transmitting the driving force of the electric dynamic motor to the throttle valve , by devising the arrangement for a pair of banks, and this to reduce the size of the V-type internal combustion engine in the vertical direction or the crank axial direction, electrostatic movement motor hindrance It made it possible to facilitate the connection work of the fuel injection valve and the fuel supply tube to prevent, and aims to achieve a compact arrangement of the fuel supply pipe.

According to the first aspect of the present invention, a plane parallel to the crank axis direction (De) parallel to the rotation center line (Le) of the crankshaft (16) and bisecting the bank angle (θ) is divided into the bank center plane ( Pb), the first bank (Bf) and the second bank (Br) arranged in a V shape across the bank central plane (Pb), and a throttle body (51) provided with a throttle valve (51) 52) and a drive device (55) for opening and closing the throttle valve (51), a collecting valve (61) connected to the throttle body (52) at the upstream end, and a collecting pipe (61) A first branch that branches from the collecting pipe (61) downstream of the intake air and communicates with intake ports (18f, 18r) provided in the cylinder heads (11f, 11r) of the front bank (Bf) and the rear bank (Br) An air intake comprising an intake pipe (60) composed of a branch pipe (62f) and a second branch pipe (62r), and a case (41) provided with an air intake (44) for taking in intake air Each of the cylinder heads (11f, 11r) for opening and closing the intake valve (21) and the exhaust valve (22) in the compressor (40) and the first bank (Bf) and the second bank (Br). In order to drive the first valve operating device (26f) and the second valve operating device (26r), and the first valve operating device (26f) and the second valve operating device (26r), respectively, In a V-type internal combustion engine comprising a first valve transmission mechanism (30f) and a second valve transmission mechanism (30r) provided in the first bank (Bf) and the second bank (Br), respectively. The drive device (55) includes an electric motor (56), and a transmission device (57) that transmits the driving force generated by the electric motor (56) to the throttle valve (51), and the throttle body (52 ), The electric motor (56), and the transmission device (57) are disposed between the first bank (Bf) and the second bank (Br),
The air intake (40) and the electric motor (56) are arranged side by side in the passage center line direction (Dt) parallel to the passage center line (Lt) of the throttle passage (52a) of the throttle body (52). The electric motor (56) has a first plane (P1) in which the rotation center line (Lm) of the rotation shaft (56b) is orthogonal to the rotation center line (Lv) of the throttle valve (51), or said passage so as to be substantially parallel to the center line direction second plane parallel to (Dt) (P2), and wherein said passage center line direction such that the angle formed with the passage center line direction (Dt) is less than 90 ° (Dt), and the first branch pipe (62f) and the second branch pipe (62r) are respectively connected to the first cylinder (10f) and the second bank ( Br) is biased and connected to the first valve transmission mechanism (30f) and the second valve transmission mechanism (30r) side with respect to the center plane (Pf, Pr) of the second cylinder (10r) belonging to Br). V characterized by It is an internal combustion engine.
According to a second aspect of the present invention, there is provided the V-type internal combustion engine according to the first aspect, wherein the transmission device (57) is arranged in the orthogonal direction (D1) perpendicular to the bank center plane (Pb). Is disposed on the first bank (Bf) side and at a position facing the first bank (Bf), and the transmission device (57) is The first valve transmission mechanism (30f) is positioned with respect to the first branch pipe (62f) that guides intake air into the first cylinder (10f) adjacent to the first valve transmission mechanism (30f). It is arranged on the opposite side to the side.
According to a third aspect of the present invention, in the internal combustion engine according to the first or second aspect , the first fuel injection valve (70f) for injecting fuel into the intake air to the first cylinder (10f) of the first bank (Bf ). And a second fuel injection valve (70r) for injecting fuel into the intake air to the second cylinder (10r) of the second bank (Br) is connected to the electric motor (56) in the crank axis direction (De). And a fuel supply pipe (71) connected to the first fuel injection valve (70f) and the second fuel injection valve (70r) is disposed on one side of the first fuel injection valve (70f). And disposed so as to approach the second bank (Br) in the orthogonal direction (D1) as it extends from the second fuel injection valve (70r) toward the other direction side in the crank axis direction (De). It is characterized by.
The invention according to claim 4 is the internal combustion engine according to any one of claims 1 to 3,
The air intake device (Ai) protrudes from the base (45a) of the case wall (45) of the air intake device toward the electric motor (56) side in the passage centerline direction (Dt), and the electric device in a bowl shape An upstream end opening (44a1) that has a cylindrical protrusion (45h) that covers the housing (56a) of the motor (56) from above, and that opens toward the housing (56a) in the protrusion (45h). And the electric motor (56) is exposed to the outside air flowing toward the upstream end opening (44a1).

According to the first aspect of the present invention, the electric motor is arranged alongside the air intake in the direction of the passage center line of the throttle passage, and the rotation center line of the rotation shaft thereof is the rotation center line of the throttle valve. Since the electric motor is arranged so as to be substantially parallel to the orthogonal first plane or the second plane parallel to the passage centerline direction and the angle formed with the passage centerline direction is less than 90 °, the electric motor is The rotation center line is arranged so as to be substantially parallel to the first plane or the second plane, and to be parallel or inclined to the passage center line direction.
Therefore, the rotation center line of the electric motor is compared with the rotation center line of the throttle valve or the plane of rotation of the throttle passage in a plane perpendicular to the direction of the passage center line, as compared with the case where the electric motor is arranged in parallel. The electric motor can be arranged compactly around the throttle body and the air intake is provided while increasing the degree of freedom of the electric motor arrangement in the range where the line is inclined from parallel to the direction of the passage center line. It is possible to reduce the overlapping portion where the electric motor and the case wall overlap when viewed from the direction of the passage centerline, which is the direction in which the case wall and the electric motor face each other. The restriction by the electric motor on the arrangement of the air intakes provided on the case wall on the electric motor side in the linear direction is reduced, and the arrangement of the air intakes on the case wall is reduced. Freedom becomes large, it becomes easy to secure a required amount of intake air.
In addition, since the degree of freedom in arranging the electric motor is increased, it is possible to compactly arrange parts arranged around the throttle body around the throttle body.
According to the second aspect of the present invention, the interval between both banks can be reduced.
According to the third aspect of the present invention , since the fuel supply pipe extends in the orthogonal direction from the first and second fuel injection valves in a direction approaching the second bank, it is disposed between the first and second banks. The electric motor is prevented from interfering with the connection between the fuel supply pipe and the first and second fuel injection valves, and the connection work is facilitated. In addition, since the fuel supply pipes connected to the first and second fuel injection valves extend from the first and second fuel injection valves to the electric motor side in the crank axis direction, the fuel supply pipes are connected to the first and second fuel injection valves. 2 Protruding from the fuel injection valve or the intake pipe to the side opposite to the side where the electric motor is located in the crank axis direction is suppressed or prevented, and the fuel supply pipe can be arranged compactly in the crank axis direction.
According to the fourth aspect, the electric motor can be cooled by the outside air flowing toward the upstream end opening of the intake device.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Referring to FIG. 1, a V-type internal combustion engine E, which is an internal combustion engine to which the present invention is applied, includes a transmission M to which power of a crankshaft 16 provided in the internal combustion engine E is input, and a motorcycle V as a vehicle. The power unit to be provided is configured. The transmission M is, for example, a gear type transmission that includes a main shaft m1, an unter shaft m2, and a transmission gear.

The motorcycle V includes a body frame including a head pipe 1, a main frame 2, a down tube 3 and a pivot plate 4, the power unit supported by the body frame, and a front fork supported by the head pipe 1 so as to be steerable. 5, a front wheel Wf supported by the pivot plate 4, a rear wheel Wr supported by a pair of swing arms 6 supported so as to be swingable by the pivot plate 4, a fuel tank 7 supported by the vehicle body frame, and an occupant's vehicle And a sheet 8.
The power generated by the internal combustion engine E is input from the crankshaft 16 to the transmission M to be shifted, and then the final reduction device is provided with a drive shaft accommodated in the left swing arm 6 from the output shaft of the transmission M. Is transmitted to the rear wheel Wr.

Referring to FIGS. 2 and 3 together, the internal combustion engine E supported by the vehicle body frame in a lateral arrangement in which the rotation center line Le of the crankshaft 16 is oriented in the vehicle width direction of the motorcycle V is from the crankshaft direction De. When viewed (hereinafter referred to as “side view”), a pair of banks Bf and Br constituted by a plurality of cylinders 10f and 10r arranged in a V shape are coupled to the lower ends of the cylinders 10f and 10r. An engine body composed of a crankcase 13 is provided.
The front bank Bf as the first bank is coupled to the cylinder 10f as the first cylinder, the first cylinder head 11f coupled to the upper end portion of the cylinder 10f, and the coupling surface 11f1 of the upper end portion of the cylinder head 11f. The rear bank Br as a second bank is composed of a first head cover 12f, a cylinder 10r as a second cylinder, a second cylinder head 11r coupled to the upper end of the cylinder 10r, and an upper end of the cylinder head 11r. And a second head cover 12r coupled to the coupling surface 11r1.
Here, in each bank Bf, Br, the cylinder heads 11f, 11r and the head covers 12f, 12r constitute engine head portions Hf, Hr. The basic structures of the banks Bf and Br are the same.

The first cylinder constituting the front bank Bf is constituted by one or a plurality of cylinders, and in this embodiment is constituted by one cylinder 10f. Similarly, the second cylinder constituting the rear bank Br is constituted by one or a plurality of cylinders, and in this embodiment is constituted by one cylinder 10r.
A crankcase 13 configured by joining case halves divided into left and right supports the crankshaft 16 in a rotatable manner.
In a side view, the bank angle θ formed by the cylinder axis Lf of the front bank Bf and the cylinder axis Lr of the rear bank Br is an acute angle here. The front bank Bf and the rear bank Bf are arranged in a V shape with the bank center plane Pb sandwiched in the orthogonal direction D1, and sandwiched between the banks Bf and Br, that is, between the banks Bf and Br in the orthogonal direction D1. The bank space Sb is formed in the range in which the banks Bf and Br are positioned in the vertical range and the vertical direction D2.

The crank axis direction De is a direction parallel to the rotation center line Le of the crank shaft 16. Further, the bank center plane Pb as a reference plane of the internal combustion engine E is parallel to the crank axis direction De, and the angles formed by the bank center plane Pb and the cylinder axis lines Lf and Lr are equal, that is, the bank angle θ is set. It is a plane that bisects. Further, a direction orthogonal to the bank center plane Pb is defined as an orthogonal direction D1, and a direction orthogonal to the crank axis direction De on the bank center plane Pb is defined as an up-down direction D2. In the vertical direction D2, the upper side is the side on which the cylinder heads 11f and 11r or a throttle valve 51 (see FIG. 5) to be described later is located with respect to the rotation center line Le.
In this embodiment, the crank axis direction De coincides with the left-right direction of the motorcycle V, the bank center plane Pb is a vertical plane, the orthogonal direction D1 is the front-rear direction of the motorcycle V, and the up-down direction D2 is The vertical direction of the motorcycle V. Further, when one of the right side and the left side is set as one direction of the crank axis direction De, the other of the right side and the left side is the other direction of the crank axis direction De, and one of the front side and the rear side is set as one side of the orthogonal direction D1. When setting the direction, the other of the front and rear is the other direction of the orthogonal direction D1.

  2 and 3, a piston 14 connected to a crankshaft 16 via a connecting rod 15 is fitted in each cylinder 10f, 10r so as to be able to reciprocate. The cylinder heads 11f and 11r have a combustion chamber 17 facing the piston 14 in the cylinder axial direction, intake ports 18f and 18r for introducing intake air from an intake device Ai described later to the combustion chamber 17, and an exhaust device Ae described later. An exhaust port 19 for introducing exhaust gas from the combustion chamber 17 (see FIG. 1), an ignition plug 20 (see FIG. 1) facing the combustion chamber 17, an intake valve for opening and closing the intake ports 18f and 18r and the exhaust port 19, respectively. 21 and an exhaust valve 22 are provided.

  The internal combustion engine E includes an intake device Ai that forms an intake passage that guides intake air into the combustion chambers 17 and the cylinders 10f and 10r, and air-fuel mixture forming means that supplies fuel to the intake air to form an air-fuel mixture. The fuel injection valves 70f and 70r (see also FIG. 4) and the combustion gas generated by burning the fuel in the combustion chamber 17 by the ignition plug 20 are led from the combustion chamber 17 to the outside of the internal combustion engine E as exhaust gas. An exhaust device Ae (see FIG. 1) that forms an exhaust passage, first and second valve operating devices 26f and 26r for opening and closing the intake valves 21 and the exhaust valves 22 in the banks Bf and Br, The first and second valve gear transmission mechanisms 30f and 30r for driving the second valve gears 26f and 26r, and the control device 80 for controlling the operation of the fuel injection valves 70f and 70r, the spark plug 20, and the like (see FIG. 4). ).

  The intake air that has passed through the intake device Ai is sucked into the combustion chamber 17 and the cylinders 10f and 10r through the intake ports 18f and 18r when the intake valve 21 is opened in the intake stroke in which the piston 14 descends, and the piston 14 rises. In the compression stroke, it is compressed in the state of an air-fuel mixture mixed with fuel. The air-fuel mixture is ignited and burned by the spark plug 20 at the end of the compression stroke, and the piston 14 driven by the pressure of the combustion gas rotates the crankshaft 16 via the connecting rod 15 in the expansion stroke in which the piston 14 descends. . Combustion gas is discharged from the combustion chamber 17 to the exhaust port 19 as exhaust gas when the exhaust valve 22 is opened in the exhaust stroke in which the piston 14 rises, and is further connected to the exhaust-side walls of the cylinder heads 11f and 11r. The gas is discharged to the outside of the internal combustion engine E through an exhaust device Ae having an exhaust pipe 23 (see FIG. 1).

In both banks Bf and Br, the first valve operating device 26f and the second valve operating device 26r provided in the cylinder heads 11f and 11r respectively include a cam shaft 27a having a valve operating cam 27b, an intake valve 21 and An intake rocker arm 27c and an exhaust rocker arm 27d that are in contact with the exhaust valve 22 and are driven by a valve cam 27b are provided.
A first valve transmission mechanism 30f and a second valve transmission mechanism 30r provided in the front bank Bf and the rear bank Br, respectively, are a drive sprocket 31a as a drive rotor provided on the crankshaft 16, A cam sprocket 31b as a driven rotating body provided on the cam shaft 27a, and a chain 31c as an endless transmission belt spanned between the sprockets 31a and 31b are provided. The drive sprocket 31a of the first transmission mechanism 30f is provided at the end of the crankshaft 16 extending leftward from the crank chamber formed by the crankcase 13, and the drive sprocket 31a of the second transmission mechanism 30r is The crankshaft 16 is provided at a shaft end portion extending rightward from the crank chamber.
A chain 31c, which is a part of each transmission mechanism 30f, 30r, is connected to chain chambers 32f, 32r as accommodation chambers constituted by cavities provided over the cylinder heads 11f, 11r, the cylinders 10f, 10r and the crankcase 13. Be contained.
In each bank Bf, Br, the valve cam 27b of the camshaft 27a that is rotationally driven by the transmission mechanisms 30f, 30r is predetermined according to the rotational position of the crankshaft 16 via the intake rocker arm 27c and the exhaust rocker arm 27d. At the time, the intake valve 21 and the exhaust valve 22 are opened and closed.

  In the engine head portions Hf, Hr of the banks Bf, Br, that is, the cylinder heads 11f, 11r and the head covers 12f, 12r, the intake-side walls 35f, 35r facing the bank center plane Pb in the orthogonal direction D1 are connected to the transmission mechanism 30f, Proximity portions 35fa and 35ra which are protrusions protruding toward the bank center plane Pb due to the arrangement of 30r and the formation of the chain chambers 32f and 32r, and the bank center plane Pb in the orthogonal direction D1 Is provided with separation portions 35fb and 35rb which are larger than the proximity portions 35fa and 35ra. When the cooling fin is provided in the engine body including the cylinder heads 11f and 11r, the proximity fins 35fa and 35ra and the separation portions 35fb and 35rb are not included in the cooling fin.

  In the front bank Bf, the proximity part 35fa is located on the transmission part side where the transmission mechanism 30f is located with respect to the first cylinder center plane Pf or the engine center plane Pe in the crank axis direction De, and the separation part 35fb is the crank axis line In the direction De, the first cylinder center plane Pf or the engine center plane Pe, the non-transmission section side opposite to the transmission section side, and the first cylinder center plane Pf side from the proximity section 35fa on the transmission section side or Located on the engine center plane Pe side. Similarly, in the rear bank Br, the proximity portion 35ra is located on the transmission portion side where the transmission mechanism 30r is located with respect to the second cylinder center plane Pr or the engine center plane Pe in the crank axis direction De, and the separation portion 35rb is In the crank axis direction De, the second cylinder center plane Pr is located on the non-transmission portion side opposite to the transmission portion side with respect to the second cylinder center plane Pr or the engine center plane Pe, and the second cylinder center plane Pr on the transmission portion side rather than the proximity portion 35ra. Or on the engine center plane Pe side. Therefore, each separation part 35fb, 35rb is located from the non-transmission part side to the transmission part side.

  Here, the cylinder center plane is a plane orthogonal to the crank axis direction De and including the cylinder axis lines Lf and Lr. In the front bank Bf, the cylinder 10f as the first cylinder adjacent to the transmission mechanism 30f in the crank axis direction De. The plane including the cylinder axis Lf is the first cylinder center plane Pf. In the rear bank Br, the plane including the cylinder axis Lr of the cylinder 10r as the second cylinder adjacent to the transmission mechanism 30r in the crank axis direction De is the second. This is the cylinder center plane Pr. Further, it is located in the center of the first cylinder center plane Pf and the second cylinder center plane Pr in the crank axis direction De, is equidistant from both cylinder center planes Pf and Pr, and is parallel to each cylinder center plane Pf and Pr. Let the plane be the engine center plane Pe.

  The front bank Bf and the rear bank Br are arranged in the crank axis direction De so that one bank (for example, the front bank Bf) has one bank (for example, the front bank Bf) with respect to the other bank (for example, the rear bank Br). In this embodiment, the transmission mechanism 30f protrudes in the direction in which the transmission mechanism 30f is located (in this embodiment, the front bank Bf is to the left of the rear bank Br) and is offset.

  Referring to FIGS. 2 to 7, an intake device Ai includes an air cleaner 40 (see also FIG. 1) as an air intake device that takes outside air as intake air, and a throttle valve 51 that controls the flow rate of intake air from the air cleaner 40. A throttle valve device 50 having a throttle body 52 provided with the air duct 48 and an air duct 48 that connects the air cleaner 40 and the throttle valve device 50 to form an air passage 48a that guides intake air from the air cleaner 40 to the throttle valve device 50; The intake pipe 60 for guiding the intake air whose flow rate is controlled by the throttle valve 51 into the combustion chambers 17 and the cylinders 10f and 10r is provided. The throttle valve device 50 and the intake pipe 60 are disposed between both banks Bf and Br, and are therefore disposed in the bank space Sb.

An air cleaner 40 disposed to the right of the throttle valve device 50 and the intake pipe 60 in the crank axis direction De is provided with an air intake port 44 for taking in intake air and a case 41 forming an air chamber 42, and an air A cleaner element 43 disposed in the chamber 42 and partitioning the air chamber 42 from the dust chamber 42a and the clean chamber 42b is provided. The case 41 is connected to the right end of the throttle body 52 together with the air duct 48, and is coupled to the right end of the first case 41a to form an air chamber 42 in cooperation with the first case 41a. Second case 41b.
Then, the intake air flowing into the dust chamber 42a from the air intake 44 passes through the cleaner element 43 and is then purified, and then flows into the clean chamber 42b, and further passes through the air passage 48a to the throttle passage 52a of the throttle valve device 50. Flow into.

The case wall 45 of the first case 41a is provided with an air intake port 44, a base portion 45a to which the throttle body 52 is connected, and a side branch 45b that forms a silencer chamber that reduces intake noise. The base 45a is formed in a substantially flat plate shape around the throttle body 52 in the radial direction centering on the passage center line Lt of the throttle passage 52a. The bottomed pipe-like side branch 45b is disposed in the bank space Sb below the throttle body 52, and protrudes leftward in the crank axis direction De or toward the engine center plane Pe in the case wall 45.
Further, the case wall 45 includes a plurality of mounting portions 45c provided with holes through which bolts for coupling the air cleaner 40 to the engine body are inserted, and bolts 45d1 (see FIG. 5) for coupling the second case 41b. A plurality of mounting seats 45d to be screwed and a drainage channel 45e for discharging water that has entered the air chamber 42 are provided.

The throttle valve device 50 includes a throttle valve 51 formed of a butterfly valve, a throttle body 52 that forms a throttle passage 52a in which the throttle valve 51 is disposed, and a drive device 55 that drives the throttle valve 51 to open and close. Almost the entire throttle body 52 and the driving device 55 are arranged between the banks Bf and Br.
The throttle valve 51 includes a valve shaft 51a that is rotatably supported by the throttle body 52. The valve shaft 51a is arranged substantially parallel to the orthogonal direction D1, and the throttle valve 51 has a rotation center line Lv (see FIG. 6) substantially parallel to the orthogonal direction D1.

The throttle passage 52a and the collective passage 61a described later each have linear passage center lines Lt and Lc substantially parallel to the crank axis direction De, and the passage center lines Lt and Lc are in the orthogonal direction D1 and the bank center plane Pb. Is offset from the rear bank Br by a predetermined distance d (see FIGS. 2 and 4). Therefore, the throttle body 52 and the collecting pipe 61 described later are offset toward the rear bank Br with respect to the bank center plane Pb. 2 and 4, the position of the passage center line Lt at the upstream end opening 52a1 (see FIG. 5) of the throttle passage 52a is indicated by “+”.
When the direction parallel to the passage center line Lt is defined as the passage center line direction Dt, the passage center line direction Dt is substantially parallel to the crank axis direction De and is substantially parallel to the passage center line Lc. Accordingly, the crank axis direction De is substantially the same as the passage center line direction Dt.

  In this specification and claims, the expression “substantially” includes the case where there is no modifier “almost” and exactly matches the case where there is no modifier “substantially”. Although it does not, it means a range in which there is no significant difference in the effect as compared with the case where there is no modifier “almost”.

The driving device 55 includes an electric motor 56 as an actuator that generates a driving force for rotating and opening the throttle valve 51, and a transmission device 57 that transmits the driving force of the electric motor 56 to the throttle valve 51. .
The electric motor 56, which is an electric actuator, includes a housing 56a disposed around the throttle body 52 at the same position as the throttle body 52 in the passage centerline direction Dt, and extends through the housing 56a to transmit a driving force. And a rotating shaft 56b as a driving member to be provided to 57. The transmission device 57 includes a gear train 57a as a transmission member that transmits the driving force input from the rotary shaft 56b to the throttle valve 51, and a housing case 57b that houses the gear train 57a and is fixed to the throttle body 52. It consists of.
In each of the electric motor 56 and the substantially cylindrical housing 56a, the width in the rotation center line direction Dm parallel to the rotation center line Lm of the rotation shaft 56b is larger than the width in the radial direction around the rotation center line Lm. large.
The air cleaner 40 and the electric motor 56 are arranged side by side in the passage centerline direction Dt, and the electric motor 56 is a first plane P1 orthogonal to the rotation centerline Lv of the throttle valve 51 or a first plane P1 parallel to the passage centerline direction Dt. It is arranged so that it is substantially parallel to the two planes P2 and the angle formed with the passage center line direction Dt is less than 90 °, preferably 20 ° or less.
In this embodiment, the rotation center line Lm is arranged so as to be along the passage center line direction Dt or substantially parallel to the passage center line direction Dt.
3 and 4 show a bank center plane Pb as an example of the first and second planes P1 and P2, and FIG. 6 shows an example of the first and second planes P1 and P2. . The two planes P1 and P2 are parallel to each other in this embodiment, but may not be parallel to each other in another example.

  The gear train 57a includes a drive gear 57a1 as an input portion provided integrally with the rotary shaft 56b in the housing case 57b, a plurality of intermediate gears 57a5 and 57a6, an output gear 57a2 composed of segment gears, and a first umbrella. This is a speed reduction mechanism constituted by an output portion constituted by a second bevel gear 57a4 in which the gear 57a3 and the valve shaft 51a of the throttle valve 51 are integrally coupled.

The housing case 57b includes a case main body 57b1 that is detachably attached to a mounting seat 52b (see FIG. 6) that is integrally formed on the front portion of the throttle body 52, and a cover 57b2 that is coupled to the case main body 57b1. Is done. The cover 57b2 has a connector 83 to which a wire-side connector 87 of a wire harness 85, which is an electric wire for transmitting a control signal controlled by the control device 80 (see FIG. 4), is connected to control the operation of the electric motor 56. , Provided integrally. The electric motor 56 opens and closes the throttle valve 51 in accordance with the accelerator operation amount by the driver and the engine operating state of the internal combustion engine E (hereinafter referred to as “engine operating state”).
The connector 83 is connected to an electric wire for taking out a detection signal of an opening detecting means 82d (conceptually shown in FIG. 5) that is housed in the housing case 57b and detects the opening of the throttle valve 51. Also serves as a connector.
The connector 83 is disposed above the throttle body 52, is located at the same position as the housing 56a in the vertical direction D2, and is located on the intake pipe 60 side and the fuel injection valves 70f and 70r side in the crank axis direction De in the cover 57b2.

  2 to 5 and 7, the intake pipe 60 includes a collecting pipe 61 connected to the throttle body 52 at the upstream end, and a front bank Bf that branches from the collecting pipe 61 on the downstream side of the intake air. The first branch pipe 62f and the second branch pipe 62r are respectively connected to the walls 35f and 35r of the cylinder heads 11f and 11r of the rear bank Br. The collecting passage 61a formed by the collecting pipe 61 branches into first and second branch passages 62fa and 62ra formed by the branch pipes 62f and 62r, and the branch passages 62fa and 62ra are sucked into the banks Bf and Br. It communicates with ports 18f and 18r.

  Here, the air passage 48a and the throttle passage 52a constitute an upstream intake passage, the collecting passage 61a and the branch passages 62fa and 62ra constitute a downstream intake passage formed by the intake pipe 60, and the air chamber 42, The upstream intake passage and the downstream intake passage constitute an intake passage formed by the intake device Ai. The air passage 48a, the throttle passage 52a and the collecting passage 61a are common intake passages common to both banks Bf and Br in order to guide intake air to all the cylinders 10f and 10r.

The fuel injection valves 70f and 70r provided for each of the cylinders 10f and 10r are a first fuel injection valve 70f for injecting fuel into the intake air to the cylinder 10f of the front bank Bf and a suction to the cylinder 10r of the rear bank Br. And a second fuel injection valve 70r for injecting fuel into the air. The first and second fuel injection valves 70f and 70r are disposed between the banks Bf and Br, and are attached to the upper portions of the first and second branch pipes 62f and 62r, respectively. The fuel is injected into the branch passages 62fa and 62ra toward the intake ports 18f and 18r. The fuel injection valves 70f and 70r are connected to one fuel supply pipe 71 through which fuel pumped from the fuel pump is guided.
The first and second fuel injection valves 70f and 70r are arranged on the left side as one direction side in the crank axis direction De with respect to the electric motor 56 and the transmission device 57. The fuel injection valves 70f and 70r and the fuel supply pipe 71 are disposed above the branch passages 62fa and 62ra.

  A wire harness that is an electric wire that transmits a control signal controlled by the control device 80 to the electric fuel injection valves 70f and 70r in order to control the fuel injection timing and the amount of supplied fuel of the fuel injection valves 70f and 70r. Connectors 84f and 84r to which the wire side connectors 88f and 88r of 86f and 86r are connected are provided. The connectors 84f and 84r are disposed above the throttle body 52 and the intake pipe 60, and hence the throttle passage 52a, the collecting passage 61a, and the branch passages 62fa and 62ra, and are located at the same position as the connector 83 in the vertical direction D2.

When viewed from the vertical direction D2 (hereinafter referred to as “plan view”), the fuel supply pipe 71 that is inclined with respect to the crank axis direction De and extends linearly is the upper end of each fuel injection valve 70f, 70r. And connection portions 71fa and 71ra connected to each other, and a pair of attachment portions 77 attached to attachment bosses 75 of both branch pipes 62f and 62r by bolts 76. A fuel introduction port is provided at the upstream end of the fuel supply pipe 71, and a connection pipe 72 bent at a substantially right angle connected to a fuel conduit 73 through which fuel from the fuel pump is guided is connected to the fuel introduction port. The In the connecting portions 71fa and 71ra, the fuel supply pipe 71, the connecting pipe 72 and the fuel conduit 73, the electric motor 56 is arranged with respect to the throttle body 52 and the intake pipe 60, and hence the throttle passage 52a, the collecting passage 61a and the branch passages 62fa and 62ra. It is arrange | positioned upwards which is the same direction as the direction made.
The fuel supply pipe 71 extends in the orthogonal direction D1 from the first fuel injection valve 70f and the second fuel injection valve 70r toward the right, which is the other direction in the crank axis direction De, and toward the upstream of the fuel flow. Then, it is arranged so as to approach the rear bank Br (see FIG. 3).

  The first fuel injection valve 70f is disposed on the cylinder 10f side of the front bank Bf with respect to the bank center plane Pb, and the second fuel injection valve 70r is disposed on the cylinder 10r side of the rear bank Br with respect to the bank center plane Pb. Is done. The first and second fuel injection valves 70f and 70r are arranged offset in the crank axis direction De. Further, the first fuel injection valve 70f, the connecting portion 71fa, and the connector 84f are arranged in the crank axis direction De from the electric motor 56, the transmission device 57, and the connector 83 more than the second fuel injection valve 70r, the connecting portion 71ra, and the connector 84r. Located far away.

  Referring to FIG. 4, the control device 80 includes an electronic control unit 81 having a microprocessor, and an operating state detecting means for detecting the engine operating state of the internal combustion engine E (see FIG. 1). The driving state detecting means for inputting the detection signal to the electronic control unit 81 includes a rotational speed detecting means 82a for detecting the engine rotational speed, a load detecting means 82b for detecting the engine load, and an operation amount of the accelerator operating member by the driver. It comprises an accelerator operation amount detection means 82c for detecting the opening, an opening degree detection means 82d, and other various detection means. The electronic control unit 81 controls the fuel injection valves 70f and 70r, the electric motor 56, and the like based on the engine operation state detected by the operation state detection means 82. Therefore, the electronic control unit 81 controls a control signal transmitted to the fuel injection valves 70f and 70r and the electric motor 56 through the wire harnesses 85, 86f and 86r connected to the connectors 83, 84f and 84r.

2 to 7, the housing 56a of the electric motor 56 is disposed above the throttle body 52 and the throttle passage 52a and at a position not intersecting with the bank center plane Pb. The case main body 57b1 attached to the front portion of the housing 56a is disposed in front of the throttle body 52 and attached to the throttle body 52. For this reason, the gear train 57a and the housing case 57b are positioned so as to overlap the throttle passage 52a, the throttle body 52, and the housing 56a when viewed from the orthogonal direction D1 (see FIGS. 5 and 7). Arranged from below to above.
The entire transmission device 57 is disposed on the front bank Bf side with respect to the bank center plane Pb.

The case wall 45 in which the air intake 44 is provided is a side where the engine center plane Pe, the throttle valve 51, the intake pipe 60, and the electric motor 56 are located in the crankcase direction De or the passage centerline direction Dt in the first case 41a. This is a portion of the first case 41a when viewed from the electric motor 56 side in the passage centerline direction Dt.
The air intake 44 includes an upper intake 44a serving as a first intake located above the throttle body 52 and the electric motor 56, and a lower intake serving as a second intake located below the upper intake 44a. And an inlet 44b.

The upper intake 44a extends over both sides of the bank center plane Pb in the orthogonal direction D1. A plate-like rectifying plate 46 extending substantially parallel to the passage center line direction Dt is disposed in the upper intake 44a.
The case wall 45 has a protrusion 45h that faces the throttle body 52 in the vertical direction D2 and protrudes from the base 45a toward the electric motor 56 in the passage centerline direction Dt, and is at least part of the housing 56a. In this embodiment, the majority of the housing 56a is provided so as to cover from above. The upper intake port 44a provided in the projecting portion 45h opens obliquely downward and toward the housing 56a at the upstream end opening 44a1. In the upper intake 44a, the upstream end opening 44a1 located on the intake pipe 60 side in the passage centerline direction Dt is at a position overlapping the housing 56a in plan view. The entire electric motor 56 is disposed between the base 45a and the fuel injection valves 70f and 70r at a position in the passage centerline direction Dt.

  The vertical range between the front bank Bf and the rear bank Br and defined by the position of the throttle body 52 in the vertical direction D2 and the position of the protruding portion 45h in the vertical direction D2 is within both banks Bf. , Br, the space Sa surrounded by the throttle body 52 and the base 45a and the protrusion 45h of the case wall 45, or the housing case 57b, the engine head Hr of the rear bank Br, the throttle body 52, the protrusion 45h and the base 45a. A space Sa is formed. In the space Sa, the upper part of which is covered with the protruding portion 45h, almost the entire housing 56a of the electric motor 56 is disposed, and the upstream end opening 44a1 is opened right above the housing 56a. This space Sa is a flow path through which outside air flows toward the upper intake port 44a during operation of the internal combustion engine E, and the housing 56a is exposed to the outside air flowing toward the air intake port 44a through the space Sa and is cooled by the outside air. Is done.

  The entire lower intake 44b is disposed on the rear bank Br side in the orthogonal direction D1 with respect to the bank center plane Pb, and in the vertical direction D2, from above the throttle body 52 and the throttle passage 52a to the throttle body 52 and the throttle passage 52a. It is provided over the same position. The lower intake 44b is located at a position facing the cylinder head 11r and the head cover 12r in the passage center line direction Dt or the crank axis direction De (see FIG. 2).

  As well shown in FIG. 3, the gear train 57a and the housing case 57b are arranged on the side where the front bank Bf is located with respect to the throttle body 52, the throttle passage 52a and the bank center plane Pb in the orthogonal direction D1. Further, the gear train 57a, the housing case 57b, and the electric motor 56 are arranged in the orthogonal direction D1 so as to face the separation portion 35fb of the cylinder head 11f and the head cover 12f (that is, the engine head portion Hf) with respect to the front bank Bf. In the direction D1, the rear bank Br is disposed at a position facing the proximity portion 35ra of the cylinder head 11r and the head cover 12r (that is, the engine head portion Hr). Among these, the storage case 57b and the separation portion 35fb are opposed to each other through only the gap in the orthogonal direction D1.

Further, the entire gear train 57a and the entire housing case 57b, and therefore the entire transmission device 57 and the entire electric motor 56, are sucked into the cylinder 10f that defines the first cylinder center plane Pf in the crank axis direction De. The transmission portion side that is opposite to the side where the transmission mechanism 30f of the front bank Bf is located with respect to the first branch pipe 62f that guides air, the engine center plane Pe, and the first and second cylinder center planes Pf and Pr. (Or right side).
At least a part of the gear train 57a and the housing case 57b, in this embodiment, the majority of them are arranged between both banks Bf and Br, and therefore lower than the uppermost part of both banks Bf and Br in the vertical direction D2. Located in. As another example, the entire gear train 57a and housing case 57b may be disposed between the pair of banks Bf and Br.

Next, operations and effects of the embodiment configured as described above will be described.
The air cleaner 40 and the electric motor 56 of the internal combustion engine E are arranged side by side in the passage center line direction Dt or the crank axis direction De, and the electric motor 56 has a rotation center line Lm of the rotation shaft 56b that is the rotation center line of the throttle valve 51. The first plane P1 orthogonal to Lv or the second plane P2 parallel to the passage centerline direction Dt is arranged so as to be substantially parallel to the passage centerline direction Dt and less than 90 °. The air intake 44 is provided in the case wall 45 on the electric motor 56 side in the passage centerline direction Dt or the crankshaft direction De in the case 41a of the air cleaner 40. With this structure, the electric motor 56 is arranged side by side with the air cleaner 40 in the passage center line direction Dt or the crank axis direction De of the throttle passage 52a, and the rotation center line Lm is perpendicular to the rotation center line Lv. Since the electric motor 56 is arranged so as to be substantially parallel to the plane P1 or the second plane P2 parallel to the passage centerline direction Dt, and the angle formed with the passage centerline direction Dt is less than 90 °. The rotation center line Lm is disposed so as to be substantially parallel to the first plane P1 or the second plane P2 and to be parallel or inclined to the passage center line direction Dt. Therefore, as compared with the case where the electric motor 56 is arranged so that the rotation center line Lm of the electric motor 56 is parallel to the rotation center line Lv or to a plane orthogonal to the passage center line direction Dt of the throttle passage 52a. The electric motor 56 can be compactly arranged around the throttle body 52 while increasing the degree of freedom of arrangement of the electric motor 56 in the range where the rotation center line Lm is inclined from parallel to the passage center line direction Dt. And the overlapping portion where the electric motor 56 and the case wall 45 overlap when viewed from the passage center line direction Dt or the crank axis direction De, which is the direction in which the case wall 45 provided with the air intake 44 and the electric motor 56 face each other. Since the size can be reduced, the case 41a, 41b of the air cleaner 40 is provided on the case wall 45 on the electric motor 56 side in the passage center line direction Dt or the crank axis direction De. Is limited by the electric motor 56 to the arrangement of the air inlet 44 is decreased, the degree of freedom of arrangement of the air inlet 44 is increased in the case wall 45, it becomes easy to secure the required amount of intake air. Furthermore, the above-mentioned effect is further enhanced by arranging the electric motor 56 so that the angle between the rotation center line Lm and the passage center line direction Dt is 20 ° or less.
Further, since the degree of freedom of the arrangement of the electric motor 56 around the throttle body 52 is increased, components arranged around the throttle body 52, such as fuel injection valves 70f and 70r, a fuel supply pipe 71, a connection pipe 72, and The fuel conduit 73 can be arranged around the throttle body 52 in a compact manner.

  The electric motor 56 is arranged such that the rotation center line Lm is along the passage center line direction Dt or the crank axis direction De, so that the electric motor 56 and the case wall 45 overlap each other when viewed from the passage center line direction Dt. Since it is possible to minimize the overlapping portion, the restriction by the electric motor 56 on the arrangement of the air intake 44 is further reduced, and the degree of freedom of arrangement of the air intake 44 in the case wall 45 is further increased. It becomes easier to secure the required amount of intake air.

  In the V-type internal combustion engine E, even when the throttle body 52 and the electric motor 56 are arranged between the front bank Bf and the rear bank Br, the electric motor 56 can be arranged compactly around the throttle body 52. Therefore, in the V-type internal combustion engine E in which the throttle body 52 and the electric motor 56 are arranged between the pair of banks Bf and Br, the degree of freedom of arrangement of the air intake 44 in the case wall 45 is increased. It is easy to secure the required intake air amount.

  In the V-type internal combustion engine E including the front bank Bf and the rear bank Br, the throttle body 52, the electric motor 56, and the transmission device 57 of the throttle valve device 50 are arranged between a pair of banks Bf and Br. The transmission device 57 is disposed in the orthogonal direction D1 orthogonal to the bank center plane Pb, on the front bank Bf side with respect to the throttle body 52, and at a position facing the separation portion 35fb of the front bank Bf, and in the crank axis direction At De, on the front bank Bf, the side opposite to the side where the transmission mechanism 30f is located with respect to the branch pipe 62f of the intake pipe 60 for guiding the intake air into the cylinder 10f adjacent to the transmission mechanism 30f or the first cylinder center plane Pf The transmission device 57 for transmitting the driving force of the electric motor 56 to the throttle valve 51 is arranged on the front bank Bf side with respect to the throttle body 52 in the orthogonal direction D1 and in the orthogonal direction. It is disposed at a position facing the separation portion 35fb of the front bank Bf in the direction D1, and is transmitted to the branch pipe 62f or the first cylinder center plane Pf connected to the cylinder head 11f of the front bank Bf in the crank axis direction De. Since the transmission mechanism 30f is provided, the proximity portion 35fa, which is a protrusion protruding toward the bank center plane Pb, is provided on the front bank Bf because the transmission mechanism 30f is provided. Even when the cylinder head 11f and the head cover 12f are formed, the arrangement of the transmission device 57 is not restricted by the proximity portion 35fa, and the degree of freedom of the arrangement of the transmission device 57 in the bank space Sb is increased. As a result, the throttle valve device 50 in which the throttle body 52 and the transmission device 57 are arranged in the bank space Sb can be compactly arranged in the up-down direction D2 or the crank axis direction De. The size can be reduced by D2 or the crank axis direction De.

  The throttle body 52 and the collecting pipe 61 of the intake pipe 60 are arranged offset to the rear bank Br side with respect to the bank center plane Pb in the orthogonal direction D1, so that the throttle body 52 and the collecting pipe 61 are transmitted. Since the front bank Bf facing the device 57 is offset in the orthogonal direction D1 to the rear bank Br side opposite to the bank center plane Pb, the front bank Bf and the transmission device 57 are offset by this offset. The interval in the orthogonal direction D1 can be increased, and the degree of freedom of arrangement of the transmission device 57 in the bank space Sb can be further increased. As a result, the throttle valve device 50 can be arranged more compactly in the vertical direction D2 or the crank axis direction De, and the internal combustion engine E can be further downsized in the vertical direction D2 or the crank axis direction De.

  In the internal combustion engine E, the electric motor 56 that drives the throttle valve 51 to open and close and the first and second fuel injection valves 70f and 70r are disposed between the front bank Bf and the rear bank Br, and the electric motor 56 and each fuel injection valve. The connector 83 of the electric motor 56 to which the wire harnesses 85, 86f, 86r for transmitting control signals to the 70f, 70r are connected respectively, and the connectors 84f, 84r of the fuel injection valves 70f, 70r are above the throttle body 52 and the intake pipe 60, Alternatively, each of the electric motor 56 and the fuel injection valves 70f and 70r disposed between the pair of banks Bf and Br is disposed above the throttle passage 52a, the collecting passage 61a, and the branch passages 62fa and 62ra. Since the connectors 83, 84f, and 84r are disposed above the throttle passage 52a or the intake passage, the power is transmitted to the electric motor 56 and the fuel injection valves 70f and 70r. Yahanesu 85,86F, facilitates the connection of 86r, moreover shortens the wiring harness 85,86F, the length of 86r.

  The first fuel injection valve 70f for injecting fuel into the intake air to the cylinder 10f in the front bank Bf and the second fuel injection valve 70r for injecting fuel into the intake air to the cylinder 10r in the rear bank Br are connected to the electric motor 56 and the transmission. Arranged on the branch pipes 62f, 62r side of the intake pipe 60, which is the left side as one direction side in the crank axis direction De with respect to the device 57, and the electric motor 56 with respect to the throttle body 52 and the intake pipe 60. And a fuel supply pipe 71 connected to the first fuel injection valve 70f and the second fuel injection valve 70r on the right side in the crank axis direction De from the fuel injection valves 70f and 70r. The fuel supply pipe 71 is arranged to approach the rear bank Br from the first and second fuel injection valves 70f and 70r in the orthogonal direction D1 by being arranged so as to approach the rear bank Br in the orthogonal direction D1 as it extends toward Extends to In addition, since it extends in the direction approaching the rear bank Br opposite to the transmission device 57, the electric motor 56 and the transmission device 57 arranged between both banks Bf and Br are connected to the fuel supply pipe 71 and the first and first banks. It is prevented from interfering with the connection with the two fuel injection valves 70f, 70r, and the connection work is facilitated. In addition, the fuel supply pipe 71 connected to the first and second fuel injection valves 70f and 70r is connected to the electric motor 56 side and the transmission device 57 side from the first and second fuel injection valves 70f and 70r in the crank axis direction De. Since it extends, the fuel supply pipe 71 may protrude from the first and second fuel injection valves 70f, 70r or the branch pipes 62f, 62r to the side opposite to the side where the transmission device 57 is located in the crank axis direction De. Suppressed or prevented, the fuel supply pipe 71 can be arranged compactly in the crank axis direction De.

  The upper intake port 44a of the air intake port 44 opens at the upstream end opening 44a1 into a space Sa surrounded by the front bank Bf, the rear bank Br, the throttle body 52, and the case wall 45 of the air cleaner 40, and the electric motor 56 Is disposed in the space Sa and exposed to the outside air flowing toward the upper intake 44a through the space Sa, so that the space Sa surrounded by the front bank Bf, the rear bank Br, the throttle body 52, and the case wall 45 The upstream end opening 44a1 of the upper intake 44a is opened, and the electric motor 56 is disposed in the space Sa and exposed to the outside air flowing toward the upper intake 44a. Therefore, the electric motor 56 passes the space Sa through the air intake. Cooled by outside air flowing toward 44a. As a result, the electric motor 56 is prevented from being overheated and its performance can be fully exhibited.

Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
When the first cylinder (or the second cylinder) is composed of a plurality of cylinders, the cylinder center plane is a plane including the cylinder axis lines Lf and Lr of the cylinder adjacent to the transmission mechanisms 30f and 30r in the crank axis direction De. .
The first bank and the second bank in the claims may be the rear banks Bf and Br and the previous banks Bf and Br, respectively, and the first and second banks may be banks other than the preceding and following banks, for example, Left and right banks may be used.
The transmission device for transmitting the driving force generated by the electric motor to the throttle valve 51 is a worm driven by the electric motor directly or via an intermediate gear, and is rotated and engaged with the worm. A worm gear including a worm wheel having a rotation center line parallel to the dynamic center line Lv may be included.
The housing 56a of the electric motor 56 may be disposed at a position overlapping the throttle body 52 and the throttle passage 52a in plan view, and may be disposed at a position intersecting with the bank center plane Pb.
The actuator may be an electric actuator other than the electric motor or a non-electric actuator.
When the internal combustion engine is other than the V-type internal combustion engine, the reference plane is a plane parallel to the crank axis direction De and including the cylinder axis lines Lf and Lr, and the engine center plane is a cylinder in the case of a single cylinder internal combustion engine. In the case of an in-line multi-cylinder cylinder that is a plane including the axes Lf and Lr and in which a plurality of cylinders are arranged in series in the crank axis direction De, it is equidistant from the cylinder axes Lf and Lr of the cylinders located at both ends in the cylinder arrangement direction. It is a plane at.
The air intake may be provided in the case by being formed by a member (for example, a duct) separate from the case wall 45 and the member being attached to the case wall 45. In addition, the air intake may be configured by one intake without being configured by a plurality of intakes that are separated from each other.
In addition to the air cleaner, the air intake device does not have a function of cleaning air, and may simply be a device for taking outside air as intake air.

  The internal combustion engine may be provided in a machine other than the vehicle.

1 is a right side view of an essential part of a motorcycle equipped with a V-type internal combustion engine to which the present invention is applied. FIG. 2 is a cross-sectional view of the internal combustion engine of FIG. 1 as viewed from the left in a plane substantially orthogonal to the crank axis direction. FIG. 2 is a plan view of an essential part centering on a cylinder head, a head cover, and an intake device in the internal combustion engine of FIG. 1. FIG. 2 is a left side view of an essential part centering on an intake device in the internal combustion engine of FIG. 1. It is sectional drawing centering on the intake device in the approximate VV line | wire of FIG. FIG. 2 is a right side view of a main part of a throttle valve device of an intake device in the internal combustion engine of FIG. 1. In the internal combustion engine of FIG. 1, it is the figure which looked at the principal part centering on the intake device from the front.

Explanation of symbols

10f, 10r ... cylinder, 11f, 11r ... cylinder head, 12f, 12r ... head cover, 16 ... crankshaft, 26f, 26r ... valve operating device, 30f, 30r ... transmission mechanism for valve operating, 32f, 32r ... chain chamber, 35fa 35ra ... Proximity part, 35fb, 35rb ... Separation part, 40 ... Air cleaner, 44 ... Air intake, 45 ... Case wall, 45h ... Projection part, 50 ... Throttle valve device, 51 ... Throttle valve, 52 ... Throttle body, 52a ... Throttle passage, 55 ... Drive device, 56 ... Electric motor, 57 ... Transmission device, 60 ... Intake pipe, 70f, 70r ... Fuel injection valve, 71 ... Fuel supply pipe, 83,84f, 84r, 87,88f, 88r ... Connector, 85, 86f, 86r ... Wire harness,
E ... Internal combustion engine, Bf, Br ... Bank, Pb ... Bank center plane, De ... Crank axis direction, D1 ... Orthogonal direction, Dm ... Rotation center line direction, Dt ... Passage center line direction, Ai ... Intake device, Le, Lm ... rotation center line, Lt, Lc ... passage center line.

Claims (4)

When a plane parallel to the crank axis direction (De) parallel to the rotation center line (Le) of the crankshaft (16) and bisecting the bank angle (θ) is defined as the bank center plane (Pb), the bank A first bank (Bf) and a second bank (Br) arranged in a V shape with a center plane (Pb) in between, a throttle body (52) provided with a throttle valve (51), and the throttle valve ( 51) a throttle valve device (50) provided with a drive device (55) for opening and closing, a collecting pipe (61) connected to the throttle body (52) at the upstream end, and the collecting downstream of the intake air The first branch pipe (62f) and the second branch pipe branch from the pipe (61) and communicate with the intake ports (18f, 18r) provided in the cylinder heads (11f, 11r) of the front bank (Bf) and the rear bank (Br). An intake pipe (60) comprising a branch pipe (62r), an air intake (40) having a case (41) provided with an air intake (44) for taking in intake air, and the first van (Bf) and the second bank (Br), in order to open and close the intake valve (21) and the exhaust valve (22), a first valve operating device provided in each cylinder head (11f, 11r) (26f) and the second valve operating device (26r), and the first bank (Bf) and the second valve operating device (26r) for driving the first valve operating device (26f) and the second valve operating device (26r), respectively. In a V-type internal combustion engine including a first valve transmission mechanism (30f) and a second valve transmission mechanism (30r) provided in two banks (Br),
The drive device (55) includes an electric motor (56), and a transmission device (57) that transmits the driving force generated by the electric motor (56) to the throttle valve (51),
The throttle body (52), the electric motor (56), and the transmission device (57) are disposed between the first bank (Bf) and the second bank (Br),
The air intake (40) and the electric motor (56) are arranged side by side in the passage center line direction (Dt) parallel to the passage center line (Lt) of the throttle passage (52a) of the throttle body (52). And
The electric motor (56) includes a first plane (P1) in which a rotation center line (Lm) of a rotation shaft (56b) thereof is orthogonal to a rotation center line (Lv) of the throttle valve (51), or the passage. so as to be substantially parallel to the second plane parallel to the center line direction (Dt) (P2), and said passage center line direction (Dt) and the angle is the passage center line direction to be less than 90 ° (Dt ) Along the
The first branch pipe (62f) and the second branch pipe (62r) are respectively a first cylinder (10f) belonging to the first bank (Bf) and a second cylinder (10r) belonging to the second bank (Br). A V-type internal combustion engine characterized in that it is biasedly connected to the center plane (Pf, Pr) of the first valve transmission mechanism (30f) and the second valve transmission mechanism (30r). The V-type internal combustion engine according to claim 1,
The transmission device (57) is in the orthogonal direction (D1) orthogonal to the bank center plane (Pb), on the first bank (Bf) side with respect to the throttle body (52), and on the first bank ( Bf), and the transmission device (57) is disposed in the first cylinder (10f) adjacent to the first valve transmission mechanism (30f) in the crank axis direction (De). A V-type internal combustion engine, wherein the first branch pipe (62f) that guides intake air to the first branch pipe (62f) is disposed on a side opposite to a side where the first valve gear transmission mechanism (30f) is located. The internal combustion engine according to claim 1 or 2 ,
The first fuel injection valve (70f) for injecting fuel into the intake air to the first cylinder (10f) of the first bank (Bf) and the intake air to the second cylinder (10r) of the second bank (Br) A second fuel injection valve (70r) for injecting fuel to the electric motor (56) on one side in the crank axis direction (De);
A fuel supply pipe (71) connected to the first fuel injection valve (70f) and the second fuel injection valve (70r) includes a first fuel injection valve (70f) and a second fuel injection valve (70r). ) To the second bank (Br) in the orthogonal direction (D1) as it extends toward the other direction side in the crank axis direction (De). The internal combustion engine according to any one of claims 1 to 3,
The air intake device (Ai) protrudes from the base (45a) of the case wall (45) of the air intake device toward the electric motor (56) side in the passage centerline direction (Dt), and the electric device in a bowl shape An upstream end opening (44a1) that has a cylindrical protrusion (45h) that covers the housing (56a) of the motor (56) from above, and that opens toward the housing (56a) in the protrusion (45h). An internal combustion engine provided, wherein the electric motor (56) is exposed to outside air flowing toward the upstream end opening (44a1).

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