JPS5888422A - Exhaust turbine supercharger for bicycle - Google Patents

Abstract

PURPOSE:To perform compact arrangement around a turbosupercharger, by adopting a dual rear exhaust DOHC engine, extensibly locating an intake pipe, from a compressor outlet of the turbocharger arranged behind a cylinder head of the engine, toward the front and connecting the intake pipe to an intake port. CONSTITUTION:A turbocharger 34 is vertically placed behind a dual rear exhaust DOHC engine 30, and a turbine 35 of the turbocharger 34 is connected to an exhaust port 31 of the engine 30 by an exhaust pipe 32, while an exhaust pipe 38 is connected to an outlet 37 of the turbine. On the other hand, a wind inducting pipe 43 is connected to an inlet 42 of a compressor 39 of the turbocharger 34, while an outlet 45 of the compressor 39 is connected to an inlet 49 of an intake port 48. That is, the outlet 45 is connected to the inlet 49 of the intake port 48 opened to a cylinder head 52 between an intake cam 50 and exhaust cam 51 through an intake pipe 46 and equalizer tube 47. In this way, the engine 30 and the turbocharger 34 can be compactly arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust turbine supercharging device for two-wheeled vehicles, which makes it possible to compact the layout of the engine and turbocharger, and increase the capacity of radiators, interthalers, etc. in the saved space. The purpose is to simplify the management of the intake pipe.

Conventionally, when mounting a turbocharger on a two-wheeled vehicle, for example, as shown in FIG. A method is adopted in which the charger 3 is placed horizontally. However, in that case, the routing of the exhaust pipe 7 from the outlet 5 of the exhaust port 4 to the inlet 6 of the turbocharger 30 and the routing of the exhaust pipe 9 from the turbine outlet 8 become complicated, resulting in an increase in resistance within the exhaust pipe and resulting in poor performance. A decline is inevitable. The exhaust pipe 7 from the exhaust port outlet 5 to the turbine inlet 6 becomes longer, and the temperature drop of the exhaust gas that occurs during that time also increases. Furthermore, the exhaust pipe 9 from the turbine outlet 8 must avoid the crankcase 10 and the rider's feet (not shown), making the shape of the exhaust pipe 9 complicated and causing the above-mentioned problems. Reference numeral 13 denotes a front wheel;
14 is a rear wheel, and 15 is a seat.

Conventionally, as shown in Fig. 2, a method is also known in which the turbocharger 3 is placed horizontally in front of the cylinder rad 18 (to the left in the figure) in a front exhaust engine 17. The running wind passes near the turbine housing in the turbocharger 3 and is heated, and the seat 1
5 Turbocharger 3 because it sprays on the upper rider
Extensive measures will be taken to prevent hot air, such as placing heat insulating boards near the area. Moreover, the routing of the exhaust pipe 19 from the turbine outlet 8 becomes complicated, as in the case of FIG.

Conventionally, as shown in FIG. 3, a method is also known in which the turbocharger 3 is placed horizontally behind the crankcase 11 (on the right side of the figure) in a parallel front exhaust engine 17. An intake pipe 22 extends rearward and downward from the air cleaner 21 arranged in a backward direction and connects to the compressor inlet in the turbocharger 3, and an intake pipe 23 from the compressor outlet extends forward and upward to the intake boat inlet of the rad 2 into the cylinder. Since it is connected to 24, the intake pipe 2
2.23 The handling becomes complicated and expensive. Furthermore, a scavenge pump 25 is required to return lubricating oil from the turbocharger 3 to the oil pan in the crankcase 11, making the structure more complicated and expensive. Pressure oil is supplied from the main gear rally in the engine 17 to lubricate the turbocharger 3, but since the turbocharger 3 is located in a low position and too much oil accumulates in the internal bearings, an electromagnetic pump or a crankshaft-driven scavenge pump is used to lubricate the turbocharger 3. 25 will be required. 2
6.27 is an exhaust pipe. The following prior art publications regarding turbocharging devices for two-wheeled vehicles are available. P) R Kosho Han 80LUB October 1980 issue, 1972
Published October 1, 1986: (B) Moto Rider December 1983 issue, Published December 1, 1981: fi CfY
(A, BGUIDE August 1980 issue 2) T-Dopa (February 1980 issue, published February 1, 1980).

In order to solve the above-mentioned conventional problems, the present invention uses a parallel rear exhaust double overhead cam engine, and introduces compressed air from the compressor outlet of the turbocharger located at the rear of the cylinder head to the intake port opened between the intake and exhaust cams. (Examples are shown in FIGS. 4 and 5.

In FIG. 4, the front end of a short exhaust pipe 32 is connected to the exhaust boat outlet 31 of the parallel rear exhaust double-over Radcam engine 30, and the exhaust pipe 32 extends rearward and upward, and connects to the exhaust boat outlet 31 of the parallel rear exhaust double overboard engine 30. It is connected to the inlet 36 of the turbine 35. At the outlet 37 of the turbine 35, there is an exhaust pipe 38 which is generally straight and horizontal when viewed from the side as shown in FIG.
The exhaust pipe 38 is opened to the atmosphere at a portion on the seat 15 rearward of the rider. The compressor 39 of the turbocharger 34 is suspended on a heat insulating wall 4° that has the function of blocking heat from the turbine 35 to the compressor 39. exhaust pipe 38
The heat from the seat 15 is shielded from being transmitted to the rider on the seat 15.

The inlet 42 of the compressor 39 is connected to # of the air guide pipe 43, and the air guide pipe 43 extends forward above the engine 3o, and the air guide hole 44 at the front end is opened toward the front in the traveling direction of the two-wheeled vehicle. There is. The outlet 45 of the compressor 39 is an intake pipe 46,
It is connected to an inlet 49 of an intake boat 48 via an equalizer tube 47.

The inlet 49 opens into a cylinder 52 between the intake cam 5G and the exhaust cam 51.

While the two-wheeled vehicle is running, high-level exhaust gas discharged from the exhaust boat outlet 31 is supplied to the turbine 35 through a short exhaust pipe 32, and after driving the turbine 35, is discharged to the atmosphere from the outlet 37 through the exhaust pipe 38.

The traveling wind in the direction of arrow A generated in the air guide hole 44 actively enters the air guide pipe 43 from the air guide hole 44 and is supplied to the compressor 39 driven by the turbine 35 . The air pressurized by the compressor 39 passes through an outlet 45, an intake pipe 46,
It is supplied to the engine 3o from the intake port 48 through the equalizer tube 47. 7U in engine 3o
The water is circulated through the radiator 54, during which time it is cooled by the air flowing in the direction of the arrow. As shown in Figure 5, the intake pipe 46
If the intercooler 55 is placed in the middle, the air pressurized by the compressor 39 will be cooled by the traveling wind in the direction of the arrow and then supplied to the intake boat 48.
Filling efficiency is improved.

As explained above, in the present invention, the turbocharger 34 is disposed behind the cylinder head 52 of the parallel rear exhaust Tuffle overhead cam engine 3o, and the rear end of the intake pipe 46 is connected to the compressor outlet 45 of the turbocharger 34. and extend the intake pipe 46 forward to connect the intake and exhaust cam 5.
Since the intake port 48 is connected to the intake port 48 which is opened between 0.51 and 0.51, a compact layout of the engine 30 and the turbocharger 34 is possible. With the saved space, it is possible to increase the capacity of the radiator 54, intercooler 55, etc., improving performance. Moreover, the arrangement of the intake pipe 46 becomes easier, and performance can be expected to be improved due to a reduction in intake resistance. As shown in the actual ship example drawing, the turbocharger 34 is arranged vertically behind the cylinder radiator 52 of the parallel rear exhaust engine 30, and the exhaust pipe 38 connected to the turbine outlet 37 is arranged rearward in a substantially straight line. When the exhaust pipe 38 is extended and opened to the atmosphere, the shape and structure of the exhaust pipe 38 from the turbine outlet 37 can be simplified, the fluid resistance downstream from the turbine outlet 37 is reduced, and an increase in turbine work can be expected. The increase in turbine work, especially at low speeds, results in a more tenacious engine. Since the turbocharger 34 is of the vertical type, the air guide pipe 43 leading to the compressor 39 is also substantially straight, reducing intake resistance and improving engine performance from this point of view as well. The compressor 39 is cooled by the running wind, and if the heat insulation I! 40 is placed behind the compressor 39 to cover the turbine 35 and the exhaust pipe 38 in the vicinity, as in the embodiment, hot air protection for the rider can be ensured. This makes operation easier, and the reduction in the amount of heat transferred to the compressor 39 lowers the cycle temperature and improves performance.

[Brief explanation of drawings]

1, 2, and 3 are left side schematic diagrams showing the conventional structure, and FIG. 4 and gIs5 are left side schematic diagrams of a two-wheeled vehicle to which the present invention is applied. 3o...Parallel rear exhaust double overhead cam engine, 34...Turbocharger, 45...Compressor outlet, 46...Intake pipe, 4
8...Intake port, 50...Intake cam, 51 Exhaust cam, 52...-Cylinder head

Claims (1)

[Claims] The turbocharger is placed behind the cylinder head of the parallel rear exhaust double overhead cam engine, and the rear end of the intake pipe is connected to the compressor outlet of the turbocharger.
An exhaust turbine supercharging device for a motorcycle, characterized in that an intake pipe is extended forward and connected to an intake port opened between intake and exhaust cams.