JPS58202331A - Engine fitted with supercharger - Google Patents

Abstract

PURPOSE:To eliminate any interference in each of exhaust gases as well as to secure the uniform supercharging pressure, by making an exhaust pipe of one side cylinder longer than that of the other side one, while leading the exhaust gases out of each cylinder into a supercharger at equal intervals as far as possible. CONSTITUTION:An exhaust valve attached to a rearward cylinder 2r is opened when a crank rotates by 360 deg.-alpha (alpha is an angle between adjacent cylinders) after another exhaust cylinder attached to a frontward cylinder 2f gets opened but in this case, the length of an exhaust pipe 19r of the rearward cylinder 2r is made up yet longer than that of the frontward cylinder 2f whereby a time lag is furthered by the time the exhaust reaches a turbine 8, so that the timing of exhaust gases out of both cylinders 2f and 2r led to the turbine 8 is made at almost equal intervals.

Description

[Detailed Description of the Invention] In a supercharged engine that pressurizes the intake air of the engine to increase charging efficiency and improve its output,
In order to obtain high output, it is preferable that the exhaust gases from each cylinder be guided to the supercharger at as equal intervals as possible, so that there is no difference between the exhaust gases and that a uniform supercharging pressure is always obtained.

The present invention relates to the improvement of a supercharged engine that meets these requirements, and its purpose is to effectively transmit engine exhaust pulsations to the exhaust turbine, and to reduce exhaust timing that is not evenly spaced. The object of the present invention is to provide a supercharger-equipped engine capable of supplying air with a stable supercharging pressure as equal as possible.

Hereinafter, Figs. 1 to 5 in which the present invention is applied to a motorcycle are shown.
An embodiment shown in the figure will be described.

The cylinder included angle of the two-cylinder four-stroke gasoline engine 1 is 45° to 900°, and one end of two connecting rods is pivotally connected to a piston (not shown) fitted in each cylinder 2. The other end of the connecting rod is pivotally connected to one crank pin.

Further, as shown in FIG. 2, the rear cylinder 2r is located to the left of the front cylinder/cylinder 2f, and each cylinder 2r
The engine 1 is formed such that the cam chain +-s 3 is located on the left side of f, , 2r.

Furthermore, the Mitsuyong case 5 is placed behind the crankcase 4 of the engine 1, and an oil pan 6 is attached to the lower part of the crankcase 4 and the transmission case 5. A supercharger 7 is attached to the oil pan 6.

Thus, the supercharger 7 has a turbine 8 on the right side and a compressor 9 on the left side connected on the same axis in the width direction of the vehicle body.
The supercharger oil supplied to the high-speed rotating shaft flows into the oil pan 10 by gravity, is sucked up by the oil pump 12 via the check valve 11, and is pumped into the supercharger oil pan. The oil inside the oil pan 6 is kept at a lower level than the oil level in the oil pan 6 at all times.

Further, an air cleaner 13 is arranged behind the rear cylinder 2r, and a connecting pipe 1.1 connecting the air cleaner 13 and an intake port 91 of the compressor 9 is arranged outside the cam chain case 3.

Furthermore, the discharge port 90 of the compressor 9 and the surge tank I
The charge pipe 15 connecting with the cam chain teeth 3
The surge tank I6 is located on the left outer side, and the surge tank I6 is located between the front and rear cylinders 2f- and 2r, and the surge tank I6 is located between the front and rear cylinders 2f- and 2r.
Carburetor attached to each 2 r +8fX1
8r is disposed within the surge tank 16.

The carburetor brake 1 is contained in the surge tank 16.
Separate the inside of tank 16 every 8f and 18r! A wall 17 is provided.

Further, each exhaust port of the cylinders 2f, 2r is an exhaust pipe 19fs1 arranged on the right side of the cylinders 2f, 2r.
9r is connected to the suction port 81 of the turbine 8.

The exhaust pipe 19f of the front cylinder 2f is directly connected to the turbine 8.
The air intake port 81 is connected to the air intake port 81. On the other hand, rear cylinder 2
The exhaust pipe of r +9 r comes out from the exhaust pipe of the same cylinder '3f 2 r, passes on the right side of the gap ring 2r on the mission case 5, bends into a do Jj near the front cylinder 2f, and connects to the front cylinder 2f. The exhaust pipe 19 f and \ both extend rearward under the engine 1 and connect to the turbine 8, and the intake port 8
It merges just before 1 and is connected. The exhaust port 8o of the turbine 8 is connected to a muffler 20, and the muffler 20 is further branched into left and right sides.

On the other hand, a waste gate pipe 21 is branched from the exhaust pipe 19r coming out of the rear cylinder 2r, enters near the branch point of the left and right muffler addition, and further the waste gate pipe 21
The open end 210 of is configured to be closed by a wastegate valve 22, and the wastegate valve 22
A rod 40 is connected to the upper end of the waste gate valve 22, and the other end of the rod 40 is connected to an actuator 41.

The actuator 4 consists of a diaphragm 12 and a coil spring 43, and the pressure of the compressor 9 is applied to the diaphragm 42.

Therefore, normally the open end 210 of the wastegate pipe 21
is closed by a wastegate valve 22, and the exhaust gas from the turbine 8 is branched to the left and right mufflers 20 and exhausted. However, when the excess M pressure of the compressor 9 exceeds a predetermined value, the diaphragm 42 is closed by a coil spring. 13, the rod 40 is pushed to the right, the wastegate valve 22 is opened, and the right muffler 20R- is passed from the rear exhaust pipe 19r through the wastegate pipe 21. When opened, the same wastegate valve 22 closes the junction of the left and right mufflers 20,
The right muffler 2OR is closed 1g, and the turbine 8 is exhausted only by the left muffler 2OL.

Further, after the exhaust valve (not shown) attached to the front cylinder 2f is opened, the exhaust valve (not shown) attached to the rear cylinder 2r is rotated 360° -
It is opened when α (α is the included cylinder angle) is rotated, but the length of the exhaust pipe 19r is longer than the exhaust pipe +9f by more than the direct distance between the two exhaust valve ports, so that it does not reach the turbine 8. By then, the time delay had become even more severe, and the front and rear cylinders had reached 2t.

The timing of the exhaust gas guided from 2r to the turbine 8 is set at approximately equal intervals.

The engine 1 is formed by a main tube 24 whose front end is fixed to the head pipe A of the motorcycle, and a down tube whose both ends are connected to a center tube extending downward from the rear end of the main tube. The rear fork is attached to these tubes 24, 5, and 26 in a space such that the rear fork is pivoted to the joint member n of the center tube 5 and down tube 26 via a pivot shaft 29 so as to be able to swing up and down.

Further, both ends of the cross member joints are integrally fixed to the left and right center tubes 5, and a supporting sleeve 31 is integrally attached to the rear surface of the cross member facing rearward, and a pair of levers (2) are attached to the sleeve 31. It is pivoted so that it can swing up and down.

Then, a jacket absorber 35 is integrally attached to the cross member I so as to be oriented in the width direction parallel to the lower direction of the cross member 30, and the absorber:
The elongated hole 33 of the lever 32 is fitted into both movable end pins 36 of the lever 35. The coil spring is a 37 Ci suspension spring.

Also, the rear back bending member 3 integrally attached to the rear fork path
A cross spar 39 is integrally installed on the 8-. The vehicle is swung left and right, and the shock absorber 35 absorbs the upward impact caused by the vehicle's travel.

Then, the lever 32 is bent as shown in FIG. 3, and the relationship between the stroke Srf of the rear fork path and the stroke Sa of the shock absorber 35 is set as shown in FIG.

Since the embodiment shown in FIGS. 1 to 4 is configured as described above, when the engine 1 is in operation, the exhaust gas discharged from each exhaust [] of the cylinders 2f12r of the engine 1 is sent to the turbine 8. Although it is guided, the rear exhaust pipe 19
Since r is longer, both the front and rear cylinders 2f and 2r
By reducing the interference of the exhaust gas guided from the exhaust gas to the turbine 8, the bending of the exhaust pipe can be made gentler, and as a result,
Sufficient supercharging can be performed during high-speed rotation.

In addition, a surge tank 16 serving as a pre-chamber is arranged between the cylinders 2, and a separation wall 17 is provided in the surge tank 16, so that the pressurized air in the surge tank 16 is transferred to the carburetor 1.
8 to each cylinder 2f, 2r, pressurized air can be uniformly supplied to each cylinder 2f%2r.

Furthermore, the rear exhaust pipe 19r is a waist gear) ql 2
Since the exhaust gas from the rear cylinder 2r is short-circuited to the muffler via the engine 1 and the wastegate valve η, when the engine 1 is set to high speed rotation, the wastegate valve 22 is opened and a part of the exhaust gas from the rear cylinder 2r is transferred to the turbine. Since the supercharger 7 is discharged directly to the muffler 2o without being sent to the muffler 2o, over-rotation of the supercharger 7 is prevented, and excessive supercharging during high-speed rotation is prevented. At this time, wastegate valve n is
In order to separate the exhaust port 81 and the right muff 5-2OR,
Since the turbine 8 is exhausted only by the left muffler 2OL, the back pressure at the exhaust port 81 becomes high, and the output of the turbine 8 can also be reduced from this aspect.

In addition, the shock absorber, which buffers the upper part of the rear fork 28 as it travels, is placed toward the center of the vehicle body, making it easier to store the shock absorber compared to conventional models in which the shock absorber is arranged vertically. This reduces the amount of space required for the engine and other equipment within the vehicle frame, making it easier to plan the placement of the engine and other equipment within the vehicle body frame.

Furthermore, since the stroke Srf of the rear fork path and the stroke Sa of the shock absorber 35 are set in the relationship as shown in FIG. 5, favorable shock absorbing properties for a motorcycle can be obtained.

In the present invention, in a supercharged front and rear V-type engine which is set to exhaust air from the other cylinder after a short period of time after the exhaust timing of one cylinder, Since the length of the exhaust pipe connected from the other cylinder to the turbocharged turbine is longer than the length of the exhaust pipe connected to the turbocharged turbine, the length of the exhaust pipe connected to the turbocharged turbine is increased. Since the timing of the exhaust gas discharged can be set at equal intervals, interference with the exhaust gas can be reduced, and the exhaust pipe can be bent more gently, allowing sufficient supercharging during high-speed rotation.

[Brief explanation of the drawing]

Fig. 1 is a side view of a motorcycle equipped with an embodiment of a supercharged engine according to the present invention, Fig. 2 is a plan view of the embodiment, and Fig. 3 is a view taken from the tn-rn arrow in Fig. 1. Figure 4 is the first
FIG. 5 is an enlarged longitudinal sectional side view of the main part of the figure, and is a characteristic diagram illustrating the relationship between the stroke and the stroke of the stroke shock absorber of the rear fork in the two-wheeled vehicle. 1... Engine, 2... Cylinder, 3... Cam chain case, 4... Crank case, 5... Mission case, 6... Oil pan, 7... Supercharger,
8...Turbine, 9...Compressor, 10...
・Supercharger oil nozzle, 11...Check pulp,
12...Oil pump, 13...Air cleaner, 1
4... Connecting pipe, 15... Charge pipe, 16... Surge tank, 17... Separation wall, 18... Carburetor, 19... Exhaust pipe, Distribution... Muffler, 21...・
Wastegate pipe, 22...wastegate valve,
Otsu...Headpipe, 24...Main tube, 5
... Center tube, 26 ... Down tube, 2
7... Joining member, y... Rear fork, 6... Pivot shaft, 30... Cross member, collision part, 35...
...Shock absorber, 36°-M movement! bottle, 37・
...Coil spring, 38...Upward curved member, 39
...Cross bar 140...Rods 1, 41...Actuator, 42...Diaphragm, 43...Coil spring, 14...Trail. Agent: Patent attorney Ehara Mogai (1 person) Figure 3 Fan 4 Figure Fan 5 rt

Claims (1)

[Claims] In a supercharged front and rear V-type engine that is set to exhaust air from the other cylinder after a short period of time after the exhaust timing of one cylinder, the one cylinder is connected to the supercharged turbine. Compared to the length of the exhaust pipe,
A supercharged engine 0 characterized in that the length of the exhaust pipe connected from the other cylinder to the supercharged turbine is increased.