JPH0224284A - Motorcycle having engine with supercharger - Google Patents

Abstract

PURPOSE:To centralize mass by placing a carburetor and an air cleaner being arranged up and down on the upper portion of a cylinder head, providing a supercharger on the intake pipe line thereof while providing an intercooler on the lower course side thereof, and placing same on a crankcase. CONSTITUTION:Since a carburetor 16 connected to a cylinder head 11 and an air cleaner 20 are placed on the upper portion of the cylinder head 11, a large space can be ensured above a crankcase 6 adjacent to the backside of the cylinder head 11 and a cylinder block 8, enabling an intercooler 34 to be naturally placed in a space provided above this crankcase 6. Therefore, the water-cooled intercooler 34 having a relatively large weight can be positioned nearly in the vicinity of the center, to enable the position of the center of gravity of a vehicle body to be placed closer to the center, improving drivability and stability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motorcycle equipped with a mechanical supercharger driven by the shaft output of an engine.

[Conventional technology]

Mechanical supercharger driven by engine shaft power,
The so-called supercharger has recently become popular in engines equipped with a supercharger, as it provides good throttle response without the delay that occurs with turbochargers.
Attempts are being made to incorporate gin into motorcycles.

[Problem to be solved by the invention]

By the way, in this supercharged engine, the intake air purified by the air cleaner is pressurized by the rotation of the rotor and sent to the engine side, so the pressurized intake air is cooled downstream of the supercharger. It is desirable to install an intercooler to increase intake air filling efficiency.

In this case, especially in motorcycles, the engine, as well as auxiliary equipment such as the intake device and cooling device, are arranged in a limited space within the frame, so it goes without saying that the layout may be affected. In order to obtain stable cooling performance, it is desirable to use a water-cooled intercooler as the ink-cooler, which can be installed in a relatively free location without being restricted by the flow of running air.

However, if the installation location of the intercooler is decided based only on space considerations, the intercooler may be placed too far to the side or above the engine, which may have a negative impact on the center of gravity of the vehicle. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motorcycle equipped with a supercharged engine that allows an intercooler to be arranged compactly near the center of the engine, thereby achieving mass concentration.

[Means to solve the problem]

Therefore, in the present invention, the cylinder block and cylinder head on the crankcase are provided tilted forward with respect to the vertical line, and a vertically ventilated carburetor and an air cleaner are arranged vertically above the cylinder head. A mechanical supercharger driven by the engine's shaft output is installed in the intake pipe connecting the air cleaner and the carburetor, and a water-cooled supercharger is installed downstream of this supercharger to cool the pressurized intake air. The engine is characterized in that an intercooler is provided, and the intercooler is arranged on the crankcase adjacent to the rear surface of the cylinder block.

[Effect]

According to this configuration, the carburetor and air cleaner connected to the cylinder head are located above the cylinder head, so a large space can be secured on the crankcase adjacent to the rear surface of the cylinder head and cylinder block. The intercooler can be easily placed in this open space above the crankcase. For this reason,
The relatively heavy water-cooled intercooler can be located near the center of the engine, which brings the center of gravity of the vehicle closer to the center and improves maneuverability and stability.

〔Example〕

The present invention will be explained below based on an embodiment shown in the drawings.

Reference numeral l in FIG. 1 is a frame that constitutes the body of a motorcycle, and the steering head vibe 2 at the front end of the frame has a
A main vibe 3 extending rearward and a down tube 4 extending downward are welded. An engine 5 is supported between the main vibe 3 and the down tube 4. The engine 5 of this embodiment is a four-stroke, water-cooled, four-cylinder engine, and a crankshaft 7 extending along the width direction of the vehicle body is supported within its crankcase B. A cylinder block 8 is erected on the front upper surface of the crankcase B, and a piston 9 in the cylinder block 8 and a crankshaft 7 are connected via a connecting rod IO.

The cylinder block 8 and the cylinder head 11 superimposed on the upper surface of the cylinder block 8 are moved greatly forward in the direction of travel with respect to the vertical line X1-Xl passing through the center of the crankshaft 7, as shown in FIG. The cylinder head 11 is tilted, and the cylinder head 11 protrudes further forward than the front surface of the crankcase B. The cylinder head 11 is formed with an intake port 13 that is opened and closed by an intake valve 12, and an exhaust port 15 that is opened and closed by an exhaust valve 14. The intake port 13 is opened upward at the rear surface of the cylinder head 11, and a downdraft type carburetor 1B is connected to this intake port 13 for each cylinder. The carburetor 1B moves forward as the cylinder head 11 tilts forward.
1, and is connected to a single surge tank 17 arranged above this carburetor 1B. Therefore, a relatively wide space 35 is secured above the crankcase B which protrudes rearward from the rear surface of the cylinder block 8.

In addition, an exhaust port 15 that opens at the front of the cylinder rad 11 is provided.
An exhaust pipe 18 extending downward is connected to the exhaust pipe 18 . After this exhaust pipe 18 passes in front of the crankcase 6,
A radiator 19 that extends rearward passing below the crankcase 6 and cools engine cooling water is disposed just before the exhaust pipe 18.

Incidentally, an air cleaner 20 is connected to the front surface of the surge tank 17. The air cleaner 20 is located directly above the cylinder head 11, and the overlapping side walls of the air cleaner 20 and surge tank 17 have
A communication hole 38 is opened to communicate the air cleaner 20 and the surge tank 17. This communication hole 38 is provided with a drain valve 39 that only allows air to flow from the air cleaner 20 to the surge tank 17.

The air cleaner 20 is connected to the surge tank 17 via an intake pipe 21 , and a mechanical supercharger 22 is installed in the intake pipe 21 to forcefully feed the intake air purified by the air cleaner 20 to the surge tank 17 . ing.

This supercharger 22 is connected to the front of the crankcase 6 and the exhaust pipe 18.
In this example, the supercharger 2
A casing 23 forming the outer shell of the crankcase B is bolted to the crankcase B. Two screw-shaped rotors 24 are housed within the casing 23.

The rotor 24 is provided parallel to the crankshaft 7, and is rotatably supported by the casing 23 in a state in which concave portions and convex portions (not shown) formed on the outer circumferential surface of the rotor 24 are engaged with each other. As shown in FIG. 3, the rotating shaft 25 of one rotor 24 enters a bulge 2G protruding from the front surface of the crankcase B, and is connected to a driven gear 27 that is pivotally supported within the bulge 2B. This driven gear 27 meshes with a reduction gear 29 on the crankshaft 7 via an intermediate gear 28. Therefore, the rotor 24 of the supercharger 22 is rotationally driven by the shaft output of the crankshaft 7.

Further, an inlet 30 is opened in the lower surface of the casing 23 and is located at one end in the axial direction of the rotor 24 . It is connected to the air cleaner 20 above.

A discharge port 32 for delivering pressurized intake air is opened in the upper surface of the casing 23 at a position deviated to the opposite side of the rotor 24 in the axial direction from the suction port 30 . Discharge port 32
is connected to the upper surge tank 17 via the downstream intake pipe 33.
In the middle of this downstream side intake pipe 33,
A water-cooled intercooler 34 is provided to cool the pressurized intake air. The intercooler 34 has a substantially rectangular box shape, and is disposed in a substantially horizontal position in a space 35 above the crankcase B, as shown in FIGS. 1 and 2. For this reason, the supercharger 22 and the ink
The front half 36a of the downstream intake pipe 33 that connects the cooler 34 is routed backward from the front of the crankcase 8 to the cylinder through one side of the rad 11, and also connects the intercooler 34 and the surge tank 17. The rear half 36b of the downstream intake pipe 33 is led upward through the space 35.

Note that a resonator 37 that damps the pulsation of the pressurized intake air is branch-connected to the front half 38a of the downstream intake pipe 33, and this resonator 37 is connected to the cylinder head 11.
is placed immediately before.

Further, the intercooler 34 is connected to a sub-radiator 41 provided in front of the upper end of the cylinder head 11 via a cooling water pipe 40. The subradiator 41 is independent of the engine cooling radiator 18, and therefore the intake air cooling system and the engine cooling system are separate and independent systems.

A water pump 42 is provided in the middle of the cooling water pipe 40 to be located upstream of the sub-radiator 41 and circulate the cooling water. The water pump 42 is attached to the right side of the cylinder head 11, and its impeller 43 is rotationally driven by an intake camshaft 44 that opens and closes the intake valve 12.

Note that a fuel tank 4 is located above the intercooler 34.
5 are arranged, and this fuel tank 4, air cleaner 20. The periphery of the surge tank 17 and the rear half 36b of the downstream intake pipe 33 is covered by a cover 46 that forms a conventional tank shape.

In a supercharged engine with such a configuration, when the shaft output of the crankshaft 7 is transmitted to the rotor 24 via the intermediate gear 28 and the driven gear 27, the two rotors 24 rotate in opposite directions while meshing with each other, and the air cleaner The intake air purified in step 20 is sucked in through the intake port 30, and the intake air is pressurized and sent out from the discharge port 32 into the downstream intake pipe 33. This pressurized intake air is supplied to the crankcase B.
The air is guided to the upper intercooler 34, where it is cooled by heat exchange with cooling water as it passes through there. This cooled intake air is led to the surge tank 17 and then distributed to the carburetor 1B of each cylinder, thereby starting supercharging.

By the way, in the above configuration, the cylinder block 8 and the cylinder head 11 are tilted forward significantly, and the carburetor 16, surge tank 17, and air cleaner 2o connected to the intake port 13 of the cylinder head 11 are arranged above the cylinder head 11. However, on the crankcase B adjacent to the rear surface of this cylinder head II and cylinder block 8,
Since a wide space 35 is secured, the intercooler 34 can be easily arranged in one space created on the crankcase 6.

Therefore, since the water-cooled intercooler 34, which is relatively heavy, is located near the center of the engine 5 near the crankshaft 7, the center of gravity of the vehicle body can be brought closer to the center and the mass can be concentrated. , maneuverability and stability can be further improved.

In the above embodiment, the intercooler is arranged on the crankcase in a substantially horizontal position, but depending on the case, it may be arranged vertically on the crankcase in the vertical direction.

Further, the driving means of the supercharger is not limited to gears, and may be driven by a belt. For example, in an engine equipped with a balancer shaft in front of the crankshaft, it may be driven by the shaft output of this balancer shaft.

Furthermore, the rotor of the supercharger is not restricted to a screw shape,
For example, a roots-type supercharger combining a cocoon-shaped rotor may be used.

〔Effect of the invention〕

According to the present invention described in detail above, the space created on the crankcase can be effectively used as an installation space for the intercooler, and the relatively heavy water-cooled intercooler is located approximately in the center of the engine. This allows the center of gravity of the vehicle to be brought closer to the center.

Therefore, the intercooler does not adversely affect the position of the center of gravity of the vehicle body, and has the advantage of contributing to improved maneuverability and stability.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a motorcycle, Fig. 2 is a side view of a supercharged engine, and Fig. 3 is a partially sectional view of the drive system of the supercharger. FIG. 5...Engine, 6...Crankcase, 8...
Cylinder block, ll... cylinder head, 16.
... Carburetor, 20... Air cleaner, 21... Intake passage, 22... Supercharger, 34... Intercooler,
35...Space.

Claims (1)

[Claims] The cylinder block and cylinder head on the crankcase are tilted forward with respect to the vertical line, and a vertically ventilated carburetor and an air cleaner are arranged vertically above the cylinder head, and the air cleaner and the carburetor are connected. A mechanical supercharger driven by the engine's shaft output is installed in the intake pipe, and a water-cooled intercooler is installed downstream of this turbocharger to cool the pressurized intake air. A motorcycle equipped with a supercharged engine, characterized in that the cooler is arranged on the crankcase adjacent to the rear surface of the cylinder block.