JP2013204544A - Internal combustion engine with supercharger of straddle-type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine with a supercharger of a straddle-type vehicle having a supercharging air passage disposed short and compactly, and capable of reducing time lag of supercharging as much as possible.SOLUTION: In an internal combustion engine with a supercharger of a straddle-type vehicle 2 that includes the supercharger 8 that is adjacently arranged to cylinders of an internal combustion engine 1 having a plurality of cylinders 13a in series, and that feeds supercharging air to the internal combustion engine through a supercharging air passage 80, the supercharging air passage is disposed between the plurality of cylinders.

Description

  The present invention relates to an internal combustion engine with a supercharger that improves mountability in a saddle-ride type vehicle and reduces a supercharging time lag.

In a motorcycle with a supercharger, a structure in which a supercharger and an intercooler are provided around an internal combustion engine is disclosed in Patent Document 1 below, for example.
Supercharged system parts are relatively large in size, so saddle-type vehicles such as motorcycles have a problem that the layout design becomes difficult compared to naturally aspirated internal combustion engines due to the limited installation space. If it can arrange | position compactly, it is preferable from a mountable viewpoint.
However, in the one shown in Patent Document 1 below, although the supercharging system components are arranged relatively compactly, the supercharged air passage from the supercharger must be piped around the internal combustion engine. The mountability is lower than a typical naturally aspirated internal combustion engine. Therefore, it is required to arrange the supercharged air passage in a compact manner to obtain the same mountability as that of a naturally aspirated internal combustion engine.
Further, since the time lag occurs until the supercharging pressure is increased as much as the supercharging air passage extends, it is also required to reduce the supercharging time lag as much as possible.

JP-A-2-70920 (FIGS. 1 to 3)

  The present invention provides an internal combustion engine with a supercharger for a straddle-type vehicle in which the supercharged air passage is compactly and shortly arranged and the time lag of supercharging can be reduced as much as possible. Is an issue.

  In order to solve the above problem, the invention according to claim 1 is arranged adjacent to a cylinder of an internal combustion engine having a plurality of cylinders in series and is supercharged via a supercharged air passage to the internal combustion engine. A straddle-type vehicle including a supercharger that pumps air, wherein the supercharged air passage is provided between the plurality of cylinders.

  According to a second aspect of the present invention, in the internal combustion engine with a supercharger of the saddle riding type vehicle according to the first aspect, the supercharged air outlet of the supercharger is a longitudinal direction along the axial direction of the rotor of the supercharger The supercharger is disposed in parallel with the crankshaft of the internal combustion engine and adjacent to the cylinder.

  According to a third aspect of the present invention, in the internal combustion engine with a supercharger of the saddle riding type vehicle according to the second aspect, the internal combustion engine is a water-cooled internal combustion engine, and a cylinder sleeve around which a piston in the cylinder slides. A water jacket is disposed on the cylinder, and the water jacket is inserted between a supercharged air passage between the cylinders and the cylinder sleeve.

  According to a fourth aspect of the present invention, in the internal combustion engine with a supercharger of the saddle riding type vehicle according to the second aspect, the supercharger is disposed behind the cylinder and has passed through the supercharged air passage. An intercooler for cooling the air is arranged in front of the cylinder.

  According to a fifth aspect of the present invention, in the internal combustion engine with a supercharger for the saddle riding type vehicle according to the first aspect, an extension shaft that protrudes outward is provided on the crankshaft of the internal combustion engine, and the extension A drive pulley of the supercharger is provided on the shaft.

  According to a sixth aspect of the present invention, in the internal combustion engine with a supercharger of the saddle riding type vehicle according to the first aspect, a crank bearing below the supercharged air passage in the internal combustion engine is provided with the supercharged air passage. It is characterized in that it is provided in a fork shape so as to be close to the crank pins in the cylinders on both sides of the cylinder.

According to the internal combustion engine with a supercharger of the saddle riding type vehicle according to the first aspect of the present invention, the supercharged air passage can be provided within the width of the internal combustion engine by providing the supercharged air passage between the cylinders in series. it can.
Therefore, in a saddle-ride type vehicle in which the mounting space is restricted, the internal combustion engine with a supercharger can be made compact, and its mounting property can be improved.
Furthermore, while the supercharging system components are arranged adjacent to the internal combustion engine, it is not necessary to bypass the supercharged air passage around the internal combustion engine, so that the supercharged air passage can be shortened, and as a result It is also possible to reduce the supercharging time lag.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the supercharged air passage between the cylinders and the supercharged air outlet of the supercharger can be connected straight, and along a plurality of cylinders in series. A supercharger can be arranged, the installation space of the supercharger can be made compact, and the mountability of the internal combustion engine with a supercharger can be improved.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, it is possible to make it difficult for the heat of the supercharged air in the supercharged air passage to be transferred to the cylinder or the combustion chamber side. Can be improved.

  According to the invention of claim 4, in addition to the effect of the invention of claim 2, since the intercooler for cooling the supercharged air pressurized by the supercharger is arranged in front of the cylinder, the running air is supplied to the intercooler. The supercharged air can be easily applied, and the supercharged air can be sent from the rear to the front of the internal combustion engine through the supercharged air passage, and the supercooled air can be efficiently cooled by the intercooler.

  According to the invention of claim 5, in addition to the effect of the invention of claim 1, the drive system of the supercharger can be set with a short inter-axis distance without increasing the number of shafts in the internal combustion engine, and the size of the internal combustion engine is increased. Can be suppressed.

  According to the invention of claim 6, in addition to the effect of the invention of claim 1, since there is a supercharged air passage between the cylinders, the crankshaft becomes longer by that amount. By providing in a shape, it is possible to ensure the support rigidity of the crankshaft while suppressing an increase in the weight of the crankcase.

1 is a left side view of a motorcycle including an internal combustion engine with a supercharger according to Embodiment 1 of the present invention. 1 is a right side view of a partial cross section of an internal combustion engine with a supercharger according to Embodiment 1 of the present invention. FIG. 3 is a developed sectional view of an internal combustion engine with a supercharger, as viewed in the direction of arrows III-III in FIG. 2. It is explanatory drawing of a supercharger by IV arrow view in FIG. FIG. 5 is a front view of a shell body of an upper crankcase (cylinder block) as viewed in the direction of arrows VV in FIG. 2. FIG. 4 is a cross-sectional development view similar to FIG. 3 of a modification of the first embodiment. It is a right view made into the partial cross section of the internal combustion engine with a supercharger which concerns on Embodiment 2 of this invention.

An internal combustion engine with a supercharger for a straddle-type vehicle according to Embodiment 1 of the present invention will be described with reference to FIGS.
In the description and claims of the present specification, the directions such as front, rear, left, right, up and down are directions of the vehicle when the internal combustion engine 1 with a supercharger of the saddle riding type vehicle according to this embodiment is mounted on the vehicle. Shall be followed. In the present embodiment, the saddle riding type vehicle is a small vehicle and is a motorcycle 2.
In the figure, an arrow FR indicates the front of the vehicle, LH indicates the left side of the vehicle, RH indicates the right side of the vehicle, and UP indicates the upper side of the vehicle.
In addition, the black small arrow added in the drawing schematically shows the flow of supercharged air in the present embodiment for reference.
The above points are the same in the description of the second embodiment of the present invention described later.

FIG. 1 to FIG. 6 relate to Embodiment 1 of the present invention. FIG. 1 shows an internal combustion engine with a supercharger (hereinafter simply referred to as “internal combustion engine”) 1 of the present embodiment. It is shown in a state where it is mounted on the “saddle-type vehicle” 2 of the invention.
An internal combustion engine 1 according to the present embodiment (an “internal combustion engine with a supercharger” of the present invention) 1 is integrally provided with a transmission 3 (see FIG. 2) at a rear portion in a crankcase 10 to constitute a so-called power unit. This is a water-cooled two-cylinder four-stroke cycle internal combustion engine mounted on the motorcycle 2 with its crankshaft 11 oriented in the vehicle width direction of the motorcycle 2, that is, in the left-right direction.
In the present invention, the “supercharger” is a mechanical supercharger, that is, a so-called supercharger 8.

The motorcycle 2 is provided with a body frame 20. The vehicle body frame 20 includes a head pipe 21, a main frame 22 that extends rearward from the head pipe 21 and supports the internal combustion engine 1, and extends rearward from the upper rear end of the main frame 22 to support an occupant seat 30. And a rear frame 23 that supports a vehicle body rear portion 32 including 31.
The main frame 22 includes a pivot plate 24 provided at the rear end portion of the main frame 22 and extending downward.

A pivot shaft 26 that supports the swing arm 25 is attached to the pivot plate 24, and the swing arm 25 extends rearward from the pivot shaft 26.
Between the swing arm 25 and the main frame 22, a rear cushion unit (not shown) that absorbs an impact applied to the vehicle body frame 20 from the rear wheel 33 is provided, and the rear wheel 33 is attached to the tip of the swing arm 25. . The rear wheel 33 is driven by a drive shaft (not shown) that connects between the internal combustion engine 2 and the rear wheel 33.

A front fork 27 is pivotally supported on the head pipe 21, a front wheel 34 is pivotally supported at the lower end portion of the front fork 27, and a steering handle 28 for steering the front wheel 34 is provided at the upper end portion of the front fork 27. .
An internal combustion engine 1 is mounted on the main frame 22.
The vehicle body frame 20 is covered with a vehicle body cover 29 at important points.

As shown in FIG. 2, the internal combustion engine 1 is configured by integrating the transmission 3 as described above, and the crankcase 10 that supports the crankshaft 11 includes an upper crankcase 10A and a lower crankcase. 10B (A is an upper side, B is a lower side, and the same applies below) and is fastened and coupled, and an oil pan 12 is attached below the lower crankcase 10B.
Two cylinder bores ("cylinders" of the present invention) 13a are arranged in series in the upper front portion of the upper crankcase 10A (see FIG. 3), and the cylinder block 13 is integrally formed with a slight inclination forward. A cylinder head 14 is superposed on 13 and fastened by being fastened, and a cylinder head cover 15 is put on the cylinder head 14 and fastened.

  As shown in FIG. 1, a throttle body 40 having a fuel injection device 41 (see FIG. 2) connected to the intake port 17 is attached behind the cylinder head 14 of the internal combustion engine 1. The exhaust pipe 19 is connected to the exhaust port 18 in front of the exhaust port 19, is bent downward, extends downward in the internal combustion engine 1, and passes through the catalyst pipe 35 to the muffler 36 on the right side of the rear wheel 33. Has reached.

As shown in FIG. 3, the journal walls 50A and 50B of the upper crankcase 10A and the lower crankcase 10B sandwich the journal portion 16 of the crankshaft 11 from above and below via a crank bearing (journal bearing) 51. In support, the crankshaft 11 is rotatably supported.
A piston 53 is fitted to the two cylinder bores 13a of the internal combustion engine 1 so as to be reciprocally slidable within the cylinder sleeve 52, and is connected to the crankpin 55 of the crankshaft 11 via a connecting rod.
Since the internal combustion engine 1 of this embodiment is an in-line two cylinder, the crankshaft 11 has three journal portions 16 arranged in the axial direction with two crankpins 55 interposed therebetween, and an upper crankcase 10A and a lower crankcase. The upper and lower journal walls 50A and 50B of the upper and lower sides of 10B are supported via a crank bearing 51, respectively.

On the other hand, in the internal combustion engine 1 of the present embodiment, the cylinder block 13 is provided with a supercharged air passage 80 penetrating before and after the internal combustion engine 1 between two cylinder bores 13a, as will be described later.
Therefore, among the three upper and lower journal walls 50A and 50B, the central upper and lower central journal walls 50AC and 50BC have a shape in which the thickness in the direction of the crankshaft 11 is increased, which increases the shaft length. The crank bearing 51 below the supercharged air passage 60 supporting the central journal portion 16C in the axial direction is provided in two fork-like shapes so as to approach the crank pins 55 of the two cylinder bores 13a on both sides.
Therefore, even if the crankshaft 11 is lengthened by the central journal portion 16c, the support rigidity of the crankshaft 11 is ensured while suppressing an increase in the weight of the crankcase 10.

A combustion chamber 56 is formed in the lower portion of the cylinder head 14 so as to face the piston 53 in the cylinder bore 13a.
In the combustion chamber 56, an intake port 17 (see FIG. 1) is opened and opened and closed by an intake valve (not shown), and an exhaust port 18 (see FIG. 1) is opened and opened and closed by an exhaust valve (not shown). 57 is mounted so as to face the combustion chamber 56.

The cylinder head 14 is mounted and accommodated with a valve operating mechanism 60 made up of valve operating system parts such as a valve operating cam shaft 58 and a driven cam chain sprocket 59 for opening and closing the intake and exhaust valves (not shown).
Cam chain chambers 13b and 14b in which a cam chain 61 for driving the valve operating mechanism 60 is accommodated are provided on the right side (outer side) of the cylinder block 13 and the cylinder head 14.

  Between the driven cam chain sprocket 59 fitted to the valve cam shaft 58 of the valve mechanism 60 and the drive cam chain sprocket 62 fitted to the crankshaft 11, the cam chain 61 is passed through the cam chain chambers 13b and 14b. The valve operating cam shaft 58 is rotated at a rotational speed that is 1/2 that of the crankshaft 11, and the valve operating mechanism 60 opens and closes the intake and exhaust valves at predetermined timings.

An AC generator 63 is attached to a portion of the crankshaft 11 protruding leftward from the upper and lower left journal walls 50AL and 50BL of the crankcase 10, and is covered with a left case cover 64L.
On the other hand, a drive cam chain sprocket 62 and a primary drive gear 65 are fitted to the upper part of the crankcase 10 of the crankshaft 11 and the part protruding to the right from the lower right journal walls 50AR and 50BR. Covered with a case cover 64R.

  The primary drive gear 65 is supported so as to rotate together with the clutch outer of the clutch 67 provided at the right end of the main shaft 66 (see FIG. 2) of the transmission 3 behind the crankshaft 11 of the crankcase 10. Rotating power transmitted to the transmission 3 via the clutch 67 and meshed with a primary driven gear (not shown) is transmitted to the rear wheel 33 via the drive shaft (not shown) as described above. Is transmitted to.

Note that the internal combustion engine 1 of the present embodiment is a water-cooled internal combustion engine, and the pump shaft 69 is rotationally driven via a drive chain 70 by a pump drive sprocket 68 of the main shaft 66 of the transmission 3, so that the oil pump 71 is illustrated. The water pump which does not perform is driven (refer FIG. 2).
The water pump cools the internal combustion engine 1 by circulating cooling water to the water jacket 72 in the cylinder block 13 and the cylinder head 14 via predetermined devices such as cooling water pipes, radiators, and thermostats (not shown). .
The oil pump 71 sucks lubricating oil from the oil pan 12 and supplies it to various parts of the machine via the oil filter 73.

  The internal combustion engine 1 as described above includes, in the present embodiment, a mechanical supercharger that is driven by the crankshaft 11 of the internal combustion engine 1, that is, a supercharger 8, and is pressurized to increase its temperature. An intercooler 9 for cooling the supercharged air;

As shown in FIG. 2, the supercharger 8 has its casing 8a attached to the front surface of the cylinder block 13, and as shown in FIG. 4, the screws having axes arranged in parallel to each other in the casing 8a. Two rotor-like rotors 81 are accommodated in a state in which screw-like uneven portions formed on the outer peripheral surface thereof are engaged with each other.
The two rotors 81 are rotationally driven in opposite directions by a transmission gear (not shown) to rotate the input shaft 82 whose axis is parallel to the rotor 81, and cleaned by passing through an air cleaner 83 attached to the left end in the figure. The intake air is drawn in from the supercharged air inlet 84 at the left end, and the intake air pressurized between the two rotors 81 is substantially centered in the longitudinal direction X (see FIG. 4) along the axial direction of the rotor 81 of the supercharger 8. It is discharged as supercharged air from a supercharged air outlet 85 that is provided in the section and opens to the side.

  As shown in FIG. 4, the input shaft 82 has a driven pulley 86 attached to the right end portion 82a protruding from the casing 8a, while the crankshaft 11 has a right case as shown in FIG. A drive pulley 87 for driving the supercharger 8 is fitted to the extended shaft 11a on the right shaft end side that passes through the cover 64R and protrudes, and the supercharger that is wound between the driven pulley 86 and the drive pulley 87. The input shaft 82 of the supercharger 8 is rotationally driven by the drive belt 88.

In this embodiment, the extension shaft 11a of the crankshaft 11 is an extension portion formed integrally with the crankshaft 11. However, the extension shaft 11a is a separate shaft portion that is attached to the right end of the crankshaft 11 and rotates integrally. May be.
Further, the driven pulley 86, the driving pulley 87, and the supercharger driving belt 88 are covered with a protective cover 89 that is further attached to the outside of the right case cover 64R, as shown in FIGS.

As shown in FIG. 2, the supercharger 8 has a longitudinal direction X parallel to the crankshaft 11 of the internal combustion engine, that is, an input shaft 82 parallel to the crankshaft 11, and the cylinder bore of the cylinder block 13. The supercharged air outlet 85 is disposed on the front surface of the cylinder block 13 so as to abut on the front surface of the cylinder block 13 via the connecting member 8b.
As shown in FIG. 5, the cylinder block 13 is provided with a supercharged air passage 80 penetrating the front and rear of the internal combustion engine 1 between the two cylinder bores 13a. Then, the supercharged air outlet 85 of the supercharger 8 is in airtight communication with the connecting member 8b.

A rear end portion 80 b of the supercharged air passage 80 is connected to an intercooler 9 disposed behind the cylinder block 13 via a supercharged air upstream duct 91.
The intercooler 9 includes a lower upstream tank 9a, an upper downstream tank 9b, a cooling tube group 9c communicating with the upstream tank 9a and the downstream tank 9b, and a corrugated fin that bends in a serpentine shape and connects the cooling tube 9c group. The supercharged air heated and pressurized by the supercharger 8 is sent to the upstream tank 9a of the intercooler 9 via the supercharged air passage 80 and the supercharged air upstream duct 91 between the supercharger 8 and the cylinder bore 13a. The supercharged air dispersed in the cooling tube group 9c provided dispersed in the vehicle width direction and flowing into the downstream tank 9b and cooled by the intercooler 9 by the traveling wind is the supercharged air downstream duct. It is sent to the surge tank 95 via 92.

The surge tank 95 is disposed almost directly above the throttle body 40, and the intake pipe 42 connected to the upstream side of the throttle body 40 penetrates into the surge tank 95, so that the supply air supply path is short. It has been made.
A cooling fan 93 is attached in front of the intercooler 9 so that the cooling air is forcibly blown to the intercooler 9 as indicated by broken line arrows. Even if it is disposed rearward, the cooling fan 93 can sufficiently cool the supercharged intake air.

FIG. 6 shows a modified example of the first embodiment in a developed sectional view of the internal combustion engine 1 as seen in the direction of the arrow in FIG.
In the first embodiment, the internal combustion engine 1 is a water-cooled internal combustion engine, and a water jacket 72 is disposed around a cylinder sleeve 52 on which a piston 53 in a cylinder bore 13a slides. Of the three upper journal walls 50A, Since the supercharged air passage 80 is provided in the middle upper central journal wall 50AC, the thickness of the upper central journal wall 50Ac in the axial direction of the crankshaft 11 is increased.
Therefore, the present modification differs from the first embodiment described above in that a water jacket 72 is inserted between the supercharged air passage 80 between the cylinder bores 13a and the cylinder sleeve 52, and the supercharged air passage 80 and the cylinder bores 13a are connected. The cooling water is interposed between them, and the others are the same.
Therefore, in this modification, the heat of the supercharged air in the supercharged air passage 80 can be made difficult to be transmitted to the cylinder bore 13a and the combustion chamber 56 side, and knock resistance is improved.

The characteristics of the first embodiment of the present invention will be described below.
That is, the motorcycle 2 provided with a supercharger 8 that is arranged adjacent to the cylinder bore 13a of the internal combustion engine 1 having a plurality of cylinder bores 13a in series and that pumps the supercharged air to the internal combustion engine 1 through the supercharged air passage 80. The supercharged air passage 80 is provided between the plurality of cylinder bores 13a.

Therefore, the supercharged air passage 80 can be provided within the width of the internal combustion engine 1 by providing the supercharged air passage 80 between the cylinder bores 13a in series.
Therefore, in the saddle riding type vehicle such as the motorcycle 2 in which the mounting space is restricted, the supercharged internal combustion engine 1 can be made compact, and its mounting property can be improved.
Further, since the supercharging system parts such as the intercooler 9 and the surge tank 95 are arranged adjacent to the internal combustion engine 1, it is not necessary to bypass the supercharging air path around the internal combustion engine 1. 80 can be shortened, and as a result, the time lag of supercharging can be reduced.

  Further, the supercharged air outlet 85 of the supercharger 8 is provided at a substantially central portion in the longitudinal direction X along the axial direction of the rotor 81 of the supercharger 80, and the supercharger 8 uses the longitudinal direction X as the crank of the internal combustion engine 1. Since it is arranged in parallel to the shaft 11 and adjacent to the plurality of cylinder bores 13a, the supercharged air passage 80 between the cylinder bores 13a and the supercharged air outlet 85 of the supercharger 8 can be connected straight, and a plurality The supercharger 8 can be arranged along the cylinder bore 13a, the installation space of the supercharger 8 can be made compact, and the mountability of the supercharged internal combustion engine 1 can be improved.

  The internal combustion engine 1 is a water-cooled internal combustion engine. A water jacket 72 is disposed around a cylinder sleeve 52 on which a piston 53 in the cylinder bore 13a slides, and the supercharged air passage 80 and the cylinder sleeve 52 between the cylinder bores 13a are arranged. Since the water jacket 72 is inserted in between, the heat of the supercharged air in the supercharged air passage 80 can be made difficult to be transmitted to the cylinder bore 13a and the combustion chamber 56 side, and the knock resistance of the internal combustion engine 1 is improved. it can.

  Further, the crankshaft 11 of the internal combustion engine 1 is provided with an extension shaft 11a protruding outward, and the extension shaft 11a is provided with a drive pulley 87 of the supercharger 8, so that the drive system of the supercharger 8 is connected to the internal combustion engine. Without increasing the number of shafts in the engine 1, it can be set with a short inter-axis distance, and an increase in the size of the internal combustion engine 1 can be suppressed.

  Since the supercharged air passage 80 is provided between the cylinder bores 13a, the crankshaft 11 becomes longer by that amount, but the crank bearing 51 below the supercharged air passage 80 in the internal combustion engine 1 sandwiches the supercharged air passage 80. Since two fork-shaped portions are provided so as to approach the crank pins 55 in the cylinder bores 13a on both sides, it is possible to ensure the support rigidity of the crankshaft 11 while suppressing an increase in the weight of the crankcase 10.

Next, an internal combustion engine with a supercharger for a saddle-ride type vehicle according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is a right side view in partial cross section of the internal combustion engine, similar to FIG. 2 according to the first embodiment.
In the present embodiment, the arrangement of the supercharger 8 and the intercooler 9 is different from that of the first embodiment, and the attachment and connection portions associated therewith are different from those of the first embodiment.
The structural functions of the supercharger 8 and the intercooler 9 as individuals are also the same.

  Accordingly, in FIG. 7, components having substantially the same functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted or simplified. Hereinafter, different portions, different arrangements, and functions will be mainly described.

  In the second embodiment, the supercharger 8 has a longitudinal direction X (see FIG. 4) parallel to the crankshaft 11 of the internal combustion engine 1 at the rear of the plurality of cylinder bores 13a of the cylinder block 13 of the internal combustion engine 1. The rear end portion 80b of the supercharged air passage 80 provided between the cylinder bores 13a and the supercharged air outlet 85 of the supercharger 8 are connected via the connecting member 108b. It is connected straight and airtight.

A front end 80 a of the supercharged air passage 80 is connected to an intercooler 9 disposed in front of the cylinder block 13 via a supercharged air upstream duct 191.
The supercharged air heated and pressurized by the supercharger 8 is sent to the upstream tank 9a below the intercooler 9 via the supercharged air passage 80 and the supercharged air upstream duct 191 between the supercharger 8 and the cylinder bore 13a. The supercharged air dispersed in the cooling tube group 9c provided dispersed in the vehicle width direction and flowing into the upper downstream tank 9b and cooled by the intercooler 9 by the traveling wind is the supercharged air downstream It is sent to the surge tank 95 via the duct 192.
The surge tank 95 is disposed almost directly above the throttle body 40, and the intake pipe 42 connected to the upstream side of the throttle body 40 penetrates into the surge tank 95, so that the supply air supply path is short. It has been made.

  Therefore, also in the second embodiment, in a straddle-type vehicle such as a motorcycle 2 in which the mounting space is restricted, the mountability of the internal combustion engine 1 with a supercharger can be improved, and further, the intercooler 9 and the surge tank 95 can be improved. The supercharging air passage 80 can be shortened because it is not necessary to bypass the supercharging air passage around the internal combustion engine 1 while the supercharging system components such as the above are disposed adjacent to the internal combustion engine 1. As a result, it is possible to reduce the time lag of supercharging.

  And in this Embodiment 2, since the intercooler 9 is arrange | positioned in the front side of the internal combustion engine 1, at the time of driving | running | working of the two-wheeled motor vehicle 2, a driving | running | working wind will hit the intercooler 9 more preferably, The cooling effect can be improved.

As shown in FIG. 4, the input shaft 82 of the supercharger 8 protrudes to the right side, and a driven pulley 86 for driving the supercharger is attached.
On the other hand, a drive pulley 87 for driving the supercharger 8 is fitted on the extension shaft 11a on the right shaft end side from which the crankshaft 11 protrudes, and the supercharger wound between the driven pulley 86 and the drive pulley 87 is fitted. The input shaft 82 of the supercharger 8 is rotationally driven by the drive belt 88.

Also in this embodiment, the extension shaft 11a of the crankshaft 11 can be an extension portion formed integrally with the crankshaft 11 or a separate shaft portion that is attached to the right end of the crankshaft 11 and rotates integrally. Also good.
Further, the driven pulley 86, the driving pulley 87, and the supercharger driving belt 88 are covered with a protective cover 189 that is further attached to the outside of the right case cover 64R (see FIG. 3), as shown in FIG.

In the second embodiment, a water jacket 72 is inserted between the supercharged air passage 80 between the cylinder bores 13a and the cylinder sleeve 52, as in the modification of the first embodiment shown in FIG. Cooling water may be interposed between the supercharged air passage 80 and the cylinder bore 13a.
In this case, the heat of the supercharged air in the supercharged air passage 80 can be made difficult to be transmitted to the cylinder bore 13a or the combustion chamber 56 side, and knock resistance is improved.

Therefore, the second embodiment has the same features and effects as the first embodiment.
Furthermore, since the supercharger 8 is disposed behind the plurality of cylinder bores 13a and the intercooler 9 for cooling the supercharged air pressurized by the supercharger 8 is disposed in front of the plurality of cylinder bores 13a, the cylinder bores 13a It is possible to easily apply the traveling wind to the intercooler 9 arranged in front of the engine, and the supercharged air is sent forward from the rear side of the internal combustion engine 1 through the supercharged air passage 80, and the intercooler 9 efficiently supplies the supercharged air. It has the feature that it can be cooled.

Although the internal combustion engine with a supercharger of the saddle riding type vehicle according to the embodiment of the present invention has been described above, the present invention naturally includes aspects different from the above embodiment within the scope of the claims. .
For example, the straddle-type vehicle of the present invention is not limited to the motorcycle according to the above-described embodiment, and includes a small vehicle such as a three-wheeled or four-wheeled buggy as long as it is a straddle-type vehicle having the configuration of claim 1. A variety of saddle riding type vehicles may be used.
In addition, the internal combustion engine with a supercharger is not limited to the two cylinders of the embodiment as long as it is an internal combustion engine having a plurality of cylinders in series. The input shaft may be arranged on the left side.
The internal combustion engine is not limited to the gasoline engine shown in the embodiment, and may be a diesel engine.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine ("internal combustion engine with a supercharger" of this invention), 2 ... Motorcycle ("saddle-type vehicle" of this invention), 8 ... Supercharger, 8a ... Casing, 8b, 108b ... Connection member, DESCRIPTION OF SYMBOLS 9 ... Intercooler, 9a ... Upstream tank, 9b ... Downstream tank, 9c ... Cooling tube group, 10 ... Crankcase, 10A ... Upper crankcase, 10B ... Lower crankcase, 11 ... Crankshaft, 11a ... Extension shaft, 13 ... Cylinder block, 13a ... Cylinder bore ("cylinder" of the present invention), 14 ... Cylinder head, 16 ... Journal part, 16C ... Central journal part, 40 ... Throttle body, 42 ... Suction pipe, 50A ... Upper journal wall, 50B ... Lower journal wall, 50AC ... Upper central journal wall, 50BC ... Lower central journal wall, 50AL ... Upper left journal wall, 50BL ... Lower left journal wall, 50AR ... Upper right journal wall , 50BR ... lower right journal wall, 51 ... crank bearing, 52 ... cylinder sleeve, 53 ... piston, 55 ... crankpin, 64R ... right case cover, 72 ... water jacket, 80 ... supercharged air passage, 80a ... front end , 80b ... rear end, 81 ... rotor, 82 ... input shaft, 83 ... air cleaner, 84 ... supercharged air inlet, 85 ... supercharged air outlet, 86 ... driven pulley, 87 ... driving pulley, 88 ... supercharger drive belt , 89, 189 ... Protective cover, 91, 191 ... Supercharged air upstream duct, 92, 192 ... Supercharged air downstream duct, 93 ... Cooling fan, 95 ... Surge tank, X ... (Supercharger) longitudinal direction

Claims (6)

Arranged adjacent to the cylinder (13a) of the internal combustion engine (1) having a plurality of cylinders (13a) in series and pumped supercharged air to the internal combustion engine (1) via the supercharged air passage (80) In a saddle-ride type vehicle (2) equipped with a supercharger (8)
The supercharged internal combustion engine of a straddle-type vehicle, wherein the supercharged air passage (80) is provided between the plurality of cylinders (13a).   The supercharger air outlet (85) of the supercharger (8) is provided at a substantially central portion in the longitudinal direction (X) along the axial direction of the rotor (81) of the supercharger (8). 2) is arranged such that its longitudinal direction (X) is parallel to the crankshaft (11) of the internal combustion engine (1) and adjacent to the cylinder (13a). An internal combustion engine with a supercharger for saddle riding type vehicles.   The internal combustion engine (1) is a water-cooled internal combustion engine, and a water jacket (72) is arranged around a cylinder sleeve (52) on which a piston (53) in the cylinder (13a) slides, and the cylinder (13a) is The internal combustion engine with a supercharger for a saddle riding type vehicle according to claim 2, wherein the water jacket (72) is inserted between the supercharged air passage (80) and the cylinder sleeve (52). organ.   The supercharger (8) is disposed behind the cylinder (13a), and an intercooler (9) for cooling the supercharged air that has passed through the supercharged air passage (80) is disposed in front of the cylinder (13a). The internal combustion engine with a supercharger for a saddle-ride type vehicle according to claim 2, wherein the internal combustion engine is a turbocharger. The crankshaft (11) of the internal combustion engine (1) is provided with an extension shaft (11a) protruding outward,
2. An internal combustion engine with a supercharger for a saddle-ride type vehicle according to claim 1, wherein a drive pulley (87) of the supercharger (8) is provided on the extension shaft (11a).   A crank bearing (51) below the supercharged air passage (80) in the internal combustion engine (1) is connected to a crankpin (55) in the cylinder (13a) on both sides sandwiching the supercharged air passage (80). 2. The internal combustion engine with a supercharger for a saddle-ride type vehicle according to claim 1, wherein the internal combustion engine is provided in a fork shape so as to approach.

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