JPS643715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to increase engine output by pressurizing intake air of an engine to increase charging efficiency.
The present invention relates to a motorcycle equipped with a supercharged engine.

For motorcycles equipped with a supercharged engine, make sure that the exposed supercharger does not interfere with obstacles, and that the supercharger does not interfere with the installation or operation of existing equipment. It is required to be able to be equipped to prevent such accidents.

It is an object of the present invention to provide a motorcycle equipped with a supercharged engine with a simple configuration that satisfies the above requirements, and its features are as follows:
The front end of a rear fork, which has an engine mounted on the vehicle body frame and has a rear wheel pivoted behind it, is pivoted vertically, and this rear fork is connected to a pair of forks arranged on the left and right sides of the rear wheel. In a motorcycle configured with legs, a supercharger for pressurizing intake air of the engine is disposed behind the engine and between the pair of fork legs.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, an engine E is suspended and supported on a body frame F of a motorcycle at an intermediate portion between front and rear wheels Wf and Wr. Engine E is
It has an engine block 1 that is in a substantially upright state, and a transmission case 2 that is connected to its lower end and also serves as a crankcase.The transmission case 2 has an upper case 2a and a lower case 2b that are separated into upper and lower parts.
The turbo supercharger S is attached to the back of the lower case 2b.

The base end of the rear fork 4 is located approximately on the same axis as the turbo supercharger S, and the base end of the rear fork 4 is connected to the center tube of the vehicle body frame F.
It is pivotally supported via a pivot shaft 5 to a support bracket 3 fixedly attached to the lower end of Fa, so as to be able to swing vertically.

To explain the above configuration in more detail, the rear fork 4 includes a pair of fork legs 4a disposed on both left and right sides of the rear wheel Wr, and a pair of fork legs 4a arranged on the left and right sides of the rear wheel Wr.
It is composed of a cross member 4b that is integrally connected just before Wr. On the other hand, the support bracket 3 integrally has two pairs of support legs 3a that extend downward and are arranged so as to sandwich the turbocharger S from the left and right sides, and between each pair of support legs 3a are the turbocharger S and the support legs 3a. Pivot shafts 5 disposed approximately on the same axis are fixedly bridged, and the pair of pivot shafts 5 pivotally support each base end of both fork legs 4a in a vertically swingable manner. The rear wheel Wr is rotatably mounted between the rear ends of both fork legs 4a as usual.

The lower end of the rear damper 26, which is suspended 25 from the vehicle body frame F so as to be swingable back and forth, is connected to the rear fork 4 via a link mechanism L. The link mechanism L includes a first link 28 whose one end is pivotally mounted 27 to the lower end of the vehicle body frame F, and a second link 30 whose one end is pivotally mounted 29 to the middle part of the rear fork 4. The rear damper 2 is configured by a pin connection 31, and the rear damper 2 is connected to the intermediate portion of the first link 28.
The lower end of 6 is connected with a pin 32. The link mechanism L swings the rear fork 4 upward;
That is, as the rear wheel W moves upward, the rate of increase in the amount of deflection of the rear damper 26 increases, and the amount of deflection of the rear damper changes in a curve with respect to the change in the amount of upward movement of the rear wheel W.

Next, the configuration of an engine E equipped with a turbo supercharger S will be explained with reference to FIGS. 1 and 2. Four cylinders 6 are formed in the engine block 1, and the engine An intake manifold 7 consisting of four independent intake pipes is connected to the back of the block 1, and an exhaust manifold 8 consisting of four independent exhaust pipes is connected to the front thereof. A throttle valve 9 and a fuel injection nozzle 10 located downstream of the valve 9 are provided. The intake manifold 7 has an upstream end arranged at the upper part of the transmission case 2.
The pre-chambers 11 are connected to an air cleaner 13 via a common intake pipe 12. Further, the downstream end of the exhaust manifold 8 is connected to one exhaust collecting box 14 arranged on one side of the lower part of the engine E, and this exhaust collecting box 14 is connected to the rear wheel through a common exhaust pipe 15.
The turbo supercharger S is connected to a muffler 16 disposed on one side of the Wr, and is provided between the exhaust pipe 15 and the intake pipe 12.

The turbocharger S has a turbine T installed in the middle of the exhaust pipe 15 and a compressor C installed in the middle of the intake pipe 12.
The compressor C has a turbine wheel 18 housed in a turbine housing 17 formed in the middle of the intake pipe 12, and the compressor C has a compressor wheel 20 housed in a compressor housing 19 formed in the middle of the intake pipe 12.
It is configured to accommodate. Both housings 1 above
7 and 19 are integrally connected via a bearing holder 21, and a rotary shaft 22 supported by the bearing holder 21 connects both the impellers 18 and 20 so that they can rotate together. Therefore, the turbo supercharger S
When installing the turbine T into the transmission case 2, place the turbine T in the bearing holder 2 with the turbine T facing the exhaust collecting box 14 side.
1 is fixed to the back of the lower case 2b of the transmission case 2.

An upstream half 15a of the exhaust pipe 15 extending from the exhaust collecting box 14 to the turbine housing 17 rises from the upper surface of the exhaust collecting box 14 and is connected to the upper outer periphery of the turbine housing 17 from diagonally above. A downstream half 15b of the exhaust pipe 15 extending from the turbine housing 17 to the muffler 16 protrudes from the center of the outer surface of the turbine housing 17, extends rearward, and is connected to the muffler 16.

Exhaust gas discharged from each cylinder 6 to the exhaust manifold 8 during the exhaust stroke of the engine E joins in the exhaust collection box 14 and then passes through the turbine T via the exhaust pipe 15, at which time the exhaust gas is transferred to the turbine wheel 18. give. As a result, the turbine wheel 18
rotates and drives the compressor impeller 20 via the rotating shaft 22, so the air taken into the intake pipe 12 from the air cleaner 13 is pressurized by the compressor C and sent to the prechamber 11, and from there to the intake manifold 7. After the flow rate is adjusted by the throttle valve 9, the fuel is mixed with the injected fuel from the injection nozzle 10, and is supplied to the cylinder 6 during the intake stroke of the engine E. In this way, high filling efficiency of the air-fuel mixture is obtained in the cylinder 6, and the combustion of the air-fuel mixture allows the engine E to exert high output.

During this operation, when pressure pulsations are induced in each independent intake pipe of the intake manifold 7 due to intermittent operation of the intake valves of the engine E, the pressure pulsations are attenuated by the prechamber 11, and the surging phenomenon of the compressor C is suppressed. Prevented.

In the above embodiment, a turbo supercharger S is used as a supercharger.
Although we have explained the case using , it can be of any format.

As described above, according to the present invention, the front end of a rear fork, which has an engine mounted on the vehicle body frame and has a rear wheel pivoted behind it, is pivotably supported vertically, and this rear fork is attached to the rear wheel. In a motorcycle configured with a pair of fork legs arranged on both left and right sides, a supercharger for pressurizing intake air of the engine is arranged behind the engine and between the pair of fork legs. Therefore, the front part of the supercharger is protected by the engine, and the left and right sides of the supercharger are protected by a pair of fork legs, which prevent interference from obstacles from the front or sides when the motorcycle is running. Moreover, even if the pivot point of the front end of the rear fork is brought closer to the center of gravity of the motorcycle, that is, the engine, the rear fork will not interfere with the supercharger.

In addition, when the supercharger is disposed between both fork legs of the rear fork, if it is disposed between a pair of pivots of both fork legs as in the above embodiment, the supercharger will be able to operate at any swinging position of the rear fork. The supercharger does not deviate from between the legs of both forks, the effect of protecting the supercharger from the rear fork is improved, and interference between the supercharger and the pivot shaft can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a side view of a motorcycle equipped with a supercharged engine of the present invention, and FIG. 2 is a schematic plan view of the supercharged engine. E...engine, F...body frame, S...turbocharger, 4...rear fork, 4a...fork leg,
5...Axis.

Claims (1)

[Scope of Claims] 1. The front end of a rear fork, which has an engine mounted on a vehicle body frame and has a rear wheel pivoted behind it, is pivotably supported vertically, and this rear fork is
In a motorcycle comprising a pair of fork legs disposed on both left and right sides of the rear wheel, a supercharger for pressurizing intake air of the engine behind the engine and between the pair of fork legs. A motorcycle equipped with a supercharged engine. 2. In what is stated in claim 1,
A supercharged engine is provided, wherein front end portions of the pair of fork legs are pivotally supported on a vehicle body frame via a pair of pivots spaced apart from each other to the left and right, and the supercharger is disposed between the pair of pivots. motorcycle.