JPH0140209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle equipped with a supercharged V-type engine.

Various types of motorcycles equipped with exhaust turbine superchargers (turbo superchargers) have been proposed for the purpose of increasing engine output and improving fuel efficiency. However, in the conventional type, an intake pipe is provided at the rear of the cylinder row of a parallel multi-cylinder engine, one supercharger is arranged near this intake pipe, and an exhaust pipe in front of the cylinder row is placed below the engine. The supercharger is arranged so that it leads to the supercharger from the side. As a result, the exhaust pipe leading the exhaust gas to the supercharger becomes long, which lowers the exhaust gas temperature and increases the loss of kinetic energy of the exhaust gas within the exhaust pipe, making it impossible to effectively utilize the dynamic pressure of the exhaust gas. For this reason, it has been difficult to maximize the performance of the supercharger.

Also, the temperature of the pressurized air discharged by a turbocharger increases due to compression, but in conventional turbochargers, the turbocharger is located near the intake pipe, so this high-temperature pressurized air is directly guided to the intake pipe. Ta. For this reason, there has also been an inconvenience that the filling efficiency of intake air is reduced.

Furthermore, since a high-temperature supercharger is close to the fuel supply system of the intake pipe, if the fuel vaporizes in the fuel pipe, there is a risk that the fuel supply will not be carried out smoothly. There was also an inconvenience in that the driver's feet were located close to each other, causing the feet to heat up and making the driver feel uncomfortable.

Furthermore, when the engine is mounted on a motorcycle, it is required to reduce the width of the engine, especially near the rear cylinder, in order to improve seating comfort for the driver.

This invention was made in view of these circumstances, and it makes it possible to effectively utilize exhaust energy to maximize the performance of the supercharger, and also cools pressurized air to improve charging efficiency. Furthermore, the fuel supply system near the intake pipe and the driver will not be adversely affected by the heat of the supercharger, and the engine width, especially near the rear cylinders, will be prevented from becoming excessive, thereby improving seating comfort for the driver. The aim is to supply motorcycles with superchargers that can.

According to the present invention, the object is to provide an intake pipe between a front cylinder and a rear cylinder that have a V-shaped side surface and are offset from each other in the width direction of the vehicle body, and also to provide an intake pipe in front of the front cylinder and behind the rear cylinder. A V-type engine is provided with an exhaust pipe at each side, an exhaust turbine supercharger is installed at the front and rear of the lower part of the engine, and an intake box is installed at the upper part of the intake pipe. Each exhaust pipe of a cylinder and a rear cylinder is independently connected to each of the front and rear superchargers, and the pressurized air discharged by each supercharger is guided to the intake box through an independent connecting pipe,
This is achieved by a supercharged motorcycle characterized in that the connecting pipe of the rear cylinder is disposed on a side opposite to the deflection direction of the rear cylinder. The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a partially sectional side view of an embodiment of the present invention, FIGS. 2 and 3 are front and rear views of the engine, and FIG. 4 is a diagram showing the type of crank. In FIG. 1, reference numeral 10 is a main frame, which includes a steering head pipe 12, a pair of left and right down tubes 14 (only one of which is shown), and a pair of left and right tank rails 16 (only one of which is shown). has. tank rail 16
The rear part thereof is bent downward into a fishhook shape, and between this lower end and the lower end of the down tube 14 there is a V
A type engine 40 was mounted on the tower. Reference numeral 18 denotes a rear arm having a substantially triangular side surface.The front end of this rear arm 18 is pivoted to the rear of the tank rail 16 so as to be able to swing vertically, and the rear wheel 2 is attached to the rear end.
0 axle is fixed. 22 is a cushion unit, the front end of which is connected to the tank rail 16;
Further, the rear ends are each pivoted to the vertices of a triangle formed by the rear arm 18. The vertical movement of the rear wheel 20 is absorbed by the expansion and contraction of this cushion unit 22. Reference numeral 24 denotes a fuel tank, which is attached to the tank rail 16. The bottom of the front part of this fuel tank 24 bulges downward from between the pair of tank rails 16 to increase the tank capacity.
It has fallen into 4. A surge tank 28 serving as an intake box is accommodated in this depression 26. 3
0 is the seat, 32 is the steering fork, 34
2 is a front wheel, 26 is a radiator for cooling engine cooling water fixed to the down tube 14, and 38 is a windshield.

40 is a 4-stroke water-cooled V-type 4-cylinder engine. This engine 40 includes a front cylinder 42 that slopes forward and a rear cylinder 44 that slopes backward, and the front cylinder 42 and the rear cylinder 44 form a V-shape on the side. The front cylinder 42 and the rear cylinder 44 are the second to fourth cylinders.
As shown in the figure, two cylinders 42a,
42b and 44a, 44b, the cylinder 42a
and 42b explode alternately with a phase difference of 360 degrees at the crank angle, and cylinders 44a and 44b also explode in the same way.
Explodes with a 360° phase difference. That is, as shown in FIG. 4, the crankshaft 46 has crank pins 48a and 48b in the same phase position, and the crank pin 48a has pistons 50a and 52a of the cylinders 42a and 44a.
However, the cylinders 42b and 4 are also connected to the crank pin 48b.
4b pistons 50b and 52b are connected to each other. Moreover, each piston 42a of the front cylinder 42,
42b is the piston 44a, 44b of the rear cylinder 44
It is deviated to the left (Figs. 2-4).

In FIG. 1, reference numerals 54 and 56 are intake pipes for the front cylinder 42 and the rear cylinder 44, which extend upward from the V-shaped space between the front and rear cylinders 42 and 44 and into the surge tank 28 serving as the intake box. It is open to This engine 40 is equipped with a gasoline injection type fuel supply device, and fuel pressurized by a fuel pump (not shown) is supplied to each intake pipe 54 and 56 via a distribution pipe 58 arranged on the lower surface of the surge tank 28. The fuel is sent to the provided injection valves 60, 62. Note that the intake pipes 54, 5
6 and the injection valves 60, 62 are connected to each cylinder 42a, 42.
b, 44a, and 44b, but only two of each are shown in FIG.

64 is an exhaust pipe provided in front of the front cylinder 42; 66
are the exhaust pipes 68 and 70 installed behind the rear cylinder 44.
are exhaust turbine superchargers disposed at the front and rear of the lower part of the engine 40, respectively. Each supercharger 68, 70 has a turbine 68a, 70a, respectively.
and compressors 68b, 70b, and each turbine 68a, 70a is located near the center line of the engine 40, as shown in FIGS. That is, the air intake ports 68c, 70 of the compressors 68b, 70b are located on the opposite side to the deflection direction of the front and rear cylinders 42, 44 in the vehicle width direction.
C opens to the right and left of the vehicle body.
The upper parts of the exhaust pipes 64 and 66 are branched to each cylinder 4.
It is connected to the exhaust ports of compressors 2a, 42b and 44a, 44b, and its lower portions are collectively connected to the exhaust inlets of compressors 68a, 70a, respectively. The exhaust gas that has passed through the compressors 68a and 70a is discharged from the sides of the vehicle body to the rear via other exhaust pipes 72 and 74 and mufflers 76 and 78, respectively. 80, 82 are connecting pipes, each connecting pipe 80,
82 are the right and left sides of the engine 40, respectively;
That is, each of the compressors 68b,
The discharge port of 70b and the surge tank 24 are communicated with each other. In FIGS. 1 and 3, 84 is a drive sprocket, and the output of the engine 40 is transmitted to the rear wheel 20 by this sprocket 84 via a chain 86 (FIG. 1). Further, in FIGS. 2 and 3, reference numeral 88 denotes a cooling water outlet, and the high temperature cooling water after circulating through the engine 40 and cooling various parts is led from this outlet 88 to the radiator 36 and cooled.

Next, the operation of this embodiment will be explained. front cylinder 42
The high-temperature and high-speed exhaust gas from the rear cylinder 44 is passed through exhaust pipes 64 and 66 to the turbines 68a and 68a, respectively.
Each turbine wheel (not shown) is guided by 70a.
After rotating at high speed, it is discharged into the atmosphere. Therefore, each compressor wheel in the compressors 68b, 70b directly connected to each turbine wheel rotates at high speed, and air flows into the compressors 68b, 70b from the air intake ports 68c, 70c and is pressurized. This pressurized air is guided to the surge tank 28 by connecting pipes 80 and 82, respectively. Each exhaust pipe 6
4 and 66 are directly connected to the compressors 68a and 70a located below the front and rear cylinders 42 and 44 through almost the shortest distance without bypassing the sides or below of the engine 40, so that the exhaust pipes 6
Not only is the high-temperature exhaust gas not cooled excessively within the exhaust gas 4, 66, but also the loss of kinetic energy of the exhaust gas is small. Therefore, the supercharger can be operated with high efficiency by effectively utilizing the dynamic pressure of the exhaust gas. Further, since the connecting pipes 80 and 82 pass on the sides of the engine 40, the traveling wind sufficiently contacts the connecting pipes 00 and 82, and the pressurized air flowing therein is cooled. Therefore, the air density supplied from the surge tank 28 and the intake pipes 54, 56 to each cylinder 42a, 42b, 44a, 44b increases, and the filling efficiency improves. Furthermore, since the rear cylinder connecting pipe 82 is located on the side opposite to the deflection direction of the rear cylinder 44, the amount of increase in the engine width especially near the rear cylinder 44 is small.

As described above, by effectively utilizing exhaust energy and improving charging efficiency, the output and fuel efficiency of the engine 40 are further improved.

In addition, since the two superchargers 68 and 70 are arranged at the front and rear of the lower part of the engine 40, as is clear from FIG.
82 is arranged approximately symmetrically with respect to a perpendicular line passing through the middle of the front and rear cylinders 42 and 44. Therefore, the exhaust pipes 64 and 66 have approximately the same length, and the connecting pipes 80 and
82 are also approximately the same length, so the exhaust back pressure of the front cylinder 42 and the rear cylinder 44 is approximately the same, and the front and rear cylinders 44 have approximately the same length.
2, 44 is easy to balance, front and rear cylinder 4
It is possible to bring out the maximum performance of both No.2 and No.2 and No.44 without putting either of them in a disadvantageous state.

The pressurized air guided into the surge tank 28 is supplied to each cylinder 42a, 42b, 44a, 44b via a throttle valve (not shown) in each intake pipe 54, 56. Inside 56 are injection valves 60, 6 that are opened at a predetermined timing by an electronic device.
Since fuel is injected from No. 2, the fuel and pressurized air mix and flow into each cylinder. This air-fuel mixture is sequentially combusted in each cylinder and becomes high-temperature, high-speed exhaust gas that drives the superchargers 68 and 70.

Note that in this embodiment, each cylinder 42a, 42b and 44a, 44b in the front and rear cylinders 42, 44 explode at equal intervals, so the superchargers 68, 70 are driven by exhaust gas discharged at equal intervals. become,
Exhaust energy, especially its dynamic pressure, can be used effectively and efficiency can be further improved. However, it is clear that the present invention also includes cases where the number of front and rear cylinders is three or more or one cylinder.

As described above, this invention uses a V-type engine,
Exhaust turbine type superchargers are installed at the front and rear of the lower part, and each supercharger is directly driven by a relatively short exhaust pipe that passes in front of the front cylinder and behind the rear cylinder, making the exhaust energy effective. It can be used to maximize the performance of the supercharger. Also before...
Since pressurized air is guided through a relatively long connecting pipe to the intake box located above between the rear cylinders, filling efficiency is improved and engine performance can be further improved.

Furthermore, since high-temperature superchargers are located far away from the fuel supply system, which is located near the intake pipe, not only does this have no adverse thermal effect on the fuel supply system, but these superchargers also receive sufficient attention from the driver. Since it is well cooled by the wind while the vehicle is running, the driver does not feel uncomfortable due to heat.

Furthermore, since the connecting pipe of the rear cylinder is located on the side opposite to the deflection direction of the rear cylinder, the increase in the engine width, especially in the vicinity of the rear cylinder, is reduced, and seating comfort for the driver does not deteriorate.

According to the present invention, each exhaust pipe and connecting pipe are approximately symmetrical with respect to the front and rear cylinders, and the exhaust back pressure of each cylinder is approximately the same, so that the balance between each cylinder is not lost.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of an embodiment of the present invention, FIGS. 2 and 3 are front and rear views of the engine, and FIG. 4 is a diagram showing the crank type of the engine. 28... Surge tank as an intake box, 40...
...V-type engine, 42...front cylinder, 44...rear cylinder, 54,56...intake pipe, 64,66...exhaust pipe, 68,70...supercharger, 80,82...connecting pipe.

Claims (1)

[Claims] 1. A V-type vehicle having a V-shaped side surface, with an intake pipe provided between a front cylinder and a rear cylinder that are offset from each other in the width direction of the vehicle body, and an exhaust pipe provided in front of the front cylinder and at the rear of the rear cylinder, respectively. type engine, exhaust turbine superchargers disposed at the front and rear of the lower part of the engine, and an intake box disposed above the intake pipe, each exhaust pipe of the front cylinder and the rear cylinder are independently connected to each of the front and rear superchargers, and the pressurized air discharged by each supercharger is guided to the intake box through an independent connecting pipe, and the front cylinder connecting pipe is connected to the rear turbocharger. A motorcycle equipped with a supercharger, characterized in that the supercharger is disposed on the side opposite to the direction of displacement of the cylinder.