JPS6058044B2 - Motorcycle turbo gear mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle turbocharger mounting device.

In FIG. 5 showing a conventional layout, exhaust gas generated by an engine 1 is supplied to a turbine 6 of a turbocharger 5 via an exhaust manifold 2 and an exhaust bypass valve (waste gate) 3, and the turbine 6 is given rotational force. After that, it is discharged to the rear through the muffler 8.

A compressor 9 driven by a turbine 6 pressurizes the air-fuel mixture taken in through a filter 10 and a carburetor 11, and supplies it with air.

In the figure, arrow F indicates the front of the motorcycle, thick black arrows indicate the flow of exhaust gas, and dashed arrows indicate the flow of the air-fuel mixture.
A fuel tank 13 is placed above the engine 1 (on the near side in Figure 5), as in conventional motorcycles, and while riding, the driver holds both left and right sides of the fuel tank 13 between his thighs to maintain his posture. Aim for stability. However, according to the conventional layout described above, the fuel tank (not shown) for supplying fuel from the fuel tank 13 to the carburetor 11 is located near the top of the heated turbine 6, which tends to cause vapor lock.

(2) Due to the lack of space in the longitudinal direction, an air chamber cannot be installed, and the distribution of air-fuel mixture to each cylinder tends to be incomplete, which adversely affects performance, exhaust gas characteristics, etc. (3) Heated exhaust manifold 2
hits the driver's feet, easily damaging the hem of the pants. (
4) The exhaust manifold has to be made into two pieces, and the exhaust leaks from the joint. (5) Waste Game 3 will be open to the atmosphere and the noise will increase. Forcibly connecting it to muffler 8 will complicate the piping, which is not good in terms of design. (6) Since the compressor is of a suction type with a carburetor 11 upstream of the compressor 9, carburetor icing occurs in cold weather, and boiling of gasoline in the float chamber occurs after driving at full throttle, and the efficiency of the compressor 9 also decreases. For this reason, the size of the filter 10 cannot be increased. (7) The return of lubricating (cooling) oil from the turbine bearing becomes completely horizontal, and the flow of oil is obstructed. Therefore, if you park on the side stand,
It becomes difficult for oil to return to the engine and leaks to the compressor or turbine side, causing a large amount of smoke to be generated from the muffler. (8) Exhaust manifold 2 becomes too long, exhaust temperature decreases, and turbine efficiency decreases. (
9) Exhaust interference occurs in exhaust manifold 2,
Exhaust energy cannot be fully used as dynamic pressure, leading to a decrease in the thermal efficiency of the entire system. The present invention places a turbocharger above the engine, which is conventionally equipped with a fuel tank.

Specifically, a dummy tank-type duct with an air intake port at the front end is installed in a position where the driver can hold it between his thighs, and a turbocharger (turbo body) is placed inside the duct just above the front of the engine. The above conventional problems are avoided by placing an intercooler in the space inside the duct at the back and supplying the air sucked in from the air intake port at the front end of the duct to the intercooler. . In Figure 1 showing the main parts of the side,
15 is a chassis (vibe frame), 16 is a dummy tank type duct whose external shape is roughly the same as a conventional fuel tank, 17
18 is an intercooler 19 is an air chamber, and 20 is a fuel such as a carburetor or EFI (electric fuel injection system). supply device, 21 is an engine, 2
2 is an exhaust manifold, 23 is an exhaust bypass valve, 24 is a bypass, 25 is a muffler, 26 is a fuel tank, 27 is a fuel pump, and 28 is a heat shield provided integrally within the duct 16.

In FIG. 2 showing the plane of FIG. 1, 30 is an air filter;
31 is a compressor that constitutes the main part of the turbocharger T. As shown in FIG. 3, the chassis 15 has a pair of rear descending vibes 34 and a horizontal upper vibe 35 that protrude from the steering head vibe 33 so as to expand as they go rearward (to the right in the figure), and both vibes 34, 35 and the cross vibe 36 are combined at a portion 37, from which only the upper vibe 35 extends rearward.

Therefore, when viewed from above, the vibrations 34, 35, and 36 form a triangular structure around the steering head vibration 33 as shown in Figure 3, and when viewed from the side, the triangular structure also appears as shown in Figure 1, which improves the design. Turbo body T with a strange shape
A space suitable for accommodating (exhaust turbine 17 and compressor 31) and air filter 30 and a durable support member can be provided. The conventional chassis is equipped with a main vibrator that extends downward from the top of the head vibrator, and a fuel tank with an inverted U-shaped cross section is mounted on top of the main vibrator.
The illustrated chassis 15 does not have such a main vibrator, and the duct 16 is a downward-opening hollow dummy tank that resembles a conventional fuel tanker, so it covers the turbo body T and intercooler 18 in an attractive manner. Like the turbo body, the intercooler 18 is fixed to the upper vibe 35 via a suitable bracket. 32 in FIG. 1 is a down tube. As shown in FIG. 4, the duct 16 has air intake ports 38 on both left and right sides of its front end (left end in the figure), and has a partition wall 39 inside thereof that covers the turbo body.

A screen is provided in the intake port 38 to prevent dirt from entering. Therefore, while the motorcycle is running, the air that flows in from the intake port 38 is supplied to the intercooler 18 without contacting the exhaust turbine 17, passes through the intercooler 18 from its upper surface to its lower surface, and then enters the lower end opening of the duct 16. It is discharged from 40. Exhaust gas generated by the engine 21 is supplied to the exhaust turbine 17 via an exhaust manifold 22 that curves upward from the engine 121, applies rotational force to the turbine, and is discharged to the atmosphere via a muffler 25.

The compressor 31 is operated by the rotational force of the turbine 17, and the fresh air taken in from the air filter 30 is compressed by the compressor 31 and flows through the intercooler 18, during which it is cooled by the cooling air passing through the duct 16. be done. The pressurized air that has passed through the intercooler 18 enters the air chamber 19 through a generally vertical intake pipe 41, where it is distributed to a generally horizontal intake pipe 42 for each cylinder.
The mixture passes through the fuel supply device 20 in each intake pipe 42 and is supplied to the engine 21 as an air-fuel mixture. Fuel is supplied from the fuel tank 26 below the seat to the fuel supply device 2 by the action of the pump 27.
Sent to 0. As explained above, in the present invention, a turbocharger is placed above the engine, a hollow dummy tank type duct that opens downward is provided at a position where the driver holds it between his thighs, and the turbocharger is housed in the front end of the duct. The turbocharger is connected by an exhaust manifold that extends upward from the front of the engine, and an intercooler is placed in the duct behind the turbocharger, with air intakes at the left and right front ends of the duct and air exhaust ports at the rear end. It features a fuel tank mounted on the body frame behind the engine.

Therefore, it is possible to forcibly take in a large amount of fresh and clean air from the air intake ports 38, 38 at the left and right front ends of the duct 16 by using the boost pressure generated while the motorcycle is running.
The intercooler 18 disposed within the duct 16 can effectively cool the intake air, and the intercooler 18 can also be small. Moreover, even though the heated turbocharger T is placed inside the duct 16, the driver may pinch the duct 16 between his thighs; Since it is cooled from the inside, it doesn't get hot, and you can get the same driving feeling as if you were holding the fuel tank between your thighs. In addition, the exhaust manifold 22 extends upward from the front of the engine 21 and connects the turbocharger T at the shortest distance.
This eliminates the risk of the hot exhaust manifold coming near the driver's legs while driving, which has the advantage of reliably preventing damage to pants and discomfort caused by heat. Moreover, according to the present invention, in relation to FIG. The disadvantages of the conventional structure described above can be avoided, and specifically, the following effects can be obtained. (1) It becomes possible to directly connect the outlet of the exhaust bypass valve 23 (waste gate) to the muffler 25, which simplifies pipe routing.

(2) Since the turbo body T is located above the engine 21, the return of the turbine bearing lubricating oil is smooth.
Oil leakage from oil seals in the turbine 17 and compressor 31 can be prevented.

(3) The exhaust manifold 22 is integrated,
The function as a high temperature and high pressure container is improved.

(4) A carburetor can be installed downstream of the compressor 31, and the advantage of the so-called blow-through type in which pressurized air passes through the carburetor can be exhibited. Also, if you use EFI in the future, you will have enough space. It becomes possible to install the air chamber 19, and the air-fuel mixture can be evenly distributed to each cylinder, which is effective in preventing exhaust gas and seizure. t) Due to the arrangement position of the turbo body T, the exhaust manifold 22 is shortened, and in the case of a four-cylinder engine, all four can be made to have approximately the same length.
Exhaust interference can be avoided by guiding the fourth cylinder and the second and third cylinders separately to the turbine housing.

Since the turbo body T is supported by the frame, the exhaust manifold 22 can be made sufficiently thin. These two points make it possible to use the dynamic pressure of the exhaust to the maximum extent possible to drive the turbine, improving the thermal efficiency of the entire system, and achieving the necessary supercharging effect even when the turbine is relatively large. be able to. Especially now that there is no ultra-small turbo, 650
In order to turbocharge a cc or 500cc engine, it is necessary to use exhaust blowdown energy as efficiently as possible, and the layout of the present invention is ideal in this respect. 7) The strangely shaped turbo body T is no longer noticeable in terms of design, and the only change in appearance compared to a regular car is the exhaust manifold 22, making it easier for users to accept it.

8) Exhaust manifold 22, exhaust turbine 17
etc., parts that are heated at high speed can be sufficiently separated from the fuel tank 26 and the fuel vibrator, and there is no fear of vapor lock.

9) There is enough space to install the intercooler 18.

Moreover, the effectiveness of the intercooler 18 is greatly increased by the duct 16 having the air intake port 38 at the front end, resulting in the advantage that a small and lightweight intercooler can be used. 11
The intercooler 18 can be installed in a place with the least vibration in a motorcycle. 11 Cool outside air to compressor 3
1, and the pressure ratio can be increased accordingly.

Brief explanation of the flashing surface Fig. 1 is a side view of the main parts of a motorcycle to which the present invention is applied, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a plan view of the chassis alone, and Fig. 4 is a fuel tank. A plan view of the unit, FIG. 5 is a plan view showing a conventional layout.

16...Dummy tank type duct, 17...
...Exhaust turbine, 18...Intercooler,
19...Air chamber, 20...Fuel supply device, 21...Engine, 22...Exhaust manifold, 25...Muffler, 31...
... Compressor, 38 ... Air intake, 40
...Opening (exhaust port), T...Turbocharger.

Claims (1)

[Claims] 1. A turbocharger is placed above the engine, and a hollow dummy tank-type duct that opens downward is provided at a position where the driver holds it between his thighs.The turbocharger is housed in the front end of the duct, and the engine and turbocharger are connected from the front of the engine. In addition to connecting it with an exhaust manifold that extends upward, an intercooler is placed in the duct behind the turbocharger, air intakes are provided at the left and right front ends of the duct, and an air outlet is provided at the rear end, and the fuel tank is connected to the body frame behind the engine. A motorcycle turbocharger mounting device characterized by being equipped with.