JPS5874831A - Internal-combustion engine with supercharger - Google Patents

Abstract

PURPOSE:To effectively utilize space as well as reduce the number of parts by a method in which a supercharger is provided below the front aide of the engine of motor bicycle, etc., and each oil pump for supplying or discharging the lubricating oil of the supercharger is provided in such way that they can drive coaxially in the vicinity of the supercharger. CONSTITUTION:An exhaust manifold 15 and a supercharger 14 to be connected with a charge pipe 18 are provided by being attached to a front cover 22 in the lower front side of the crank case 11a of an engine 11. The first pump 23 for supplying a lubricating oil and the second pump 24 for discharging the lubricating oil are provided in parallel between the case 11a and the supercharger 14. In this case, both the pumps 23 and 24 are set on the same axis, the shaft 25 is projected to the front of the case 11a and driven through sprockets 29 and 26 and a chain 27 by the rotation of the crank shaft 28. The supercharger 14 is connnected through pipelines 30a and 30b to the pumps 33 and 24, and the pump 24 is connected to an oil trap in the case 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharged internal combustion engine for a motorcycle or the like.

For internal combustion engines such as motorcycles, engines with a supercharger called a turbocharger have been proposed.The supercharger consists of a turbine and a compressor.The turbine is driven by exhaust gas, which drives the compressor and extracts air from the air cleaner. The supplied air is compressed and supplied to the fuel supply system.

Since such a supercharger is driven by exhaust gas, it is preferable to place it in the exhaust system leading from the internal combustion engine, close to the engine. However, if a water-cooled engine is used, the placement of the supercharger etc.・It is necessary to take this into account, and it is preferable to lubricate the turbocharger pump and one shaft of the turbine by forced discharge considering the thermal effects of the turbine, etc. In this case, the lubricating oil supply pump and If the suction and discharge pumps are driven separately by separate drive means, it is difficult to say that it is the best in terms of layout such as arrangement of each, and if each is driven by separate drive means, the number of parts will increase, etc. There are disadvantages.

The present invention has been made in view of the above, and its purpose is to install a supercharger in an internal combustion system in a motorcycle or the like, and to provide a pump for supplying lubricating oil to the supercharger and a pump for sucking and discharging lubricating oil. This K
It is an object of the present invention to provide an internal combustion engine with a supercharger that is more advantageous in terms of space and has a reduced number of parts.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic side view of the motorcycle 1, in which the frame 2 includes a single backbone frame 2a extending rearward from the top of the head tube 3, and a backbone frame 2a extending left and right rearward from the bottom of the head tube 3. There are two main frames 2b, a down tube 2c extending downward and rearward (the lower part of the head tube 3 is 1°), and a down tube 2c erected upward from the rear end of the down tube 2c.

Center stay 2 connected to the rear of main frame 2b
It consists of d etc. A front fork 4 that supports a lower wheel 5 is pivoted to the head tube 3 through upper and lower bridges 6.6 so that it can be steered freely, and a handle 7 is attached to the top bridge, and a handlebar 7 is attached to the top bridge. rear wheel 9
A rear fork 8 is pivotally installed to support the rear fork 8.
and is extended to the rear of the main frame 2b.
A cushion unit 10 is interposed between e.

An engine 11 is mounted behind the down tube 2c and above the rear lower part 2f under the main frame 2b and the pack horn frame 2a, and a fuel tank 12 is mounted above this.
And a seat 13 is provided behind this.

A supercharger 14 is disposed at the front of the lower part of the engine 11.The supercharger 14 consists of a turbine section 14'a driven by exhaust gas and a compressor section 14b driven by the turbine section 14'a. The exhaust manifold 15 of the engine 11 is connected to the exhaust manifold 15, and in the embodiment, the crankshaft of the two cylinders facing forward is vertically arranged so as to face in the longitudinal direction, and the manifold 15a of each cylinder.

15b is guided to the turbine section 14a via the confluence section 15c. The upstream part of the compressor part 14b is connected to the air cleaner 17 located below the front of the fuel tank via the intake pipe 16, and the downstream part is connected to the charge pipe 18, which runs vertically up the front of the engine. It extends rearward from above, with a renonance chamber 19 interposed in the middle, and the rear end is connected to the full chamber 2o. A carburetor 21 is provided, and each is connected in communication with the rear of the supercharger 14 and the engine 11 as shown in FIG.
Lubricating oil and a pump are arranged between the lower front part of the crankcase 11a and the pump is supported by an engine front cover 22 provided on the front side of the crankcase. This is supported. The pump is the first for lubricating oil supply.
It consists of a pump 23 and a second pump 24 for sucking and discharging the shaft lubricating oil of the supercharger 14. These pumps 23 and 24 are arranged in parallel in the front and back, and are driven by the same shaft 25, and the shaft 25 is located at the rear, that is, the crankcase. It protrudes from the front and is connected to, for example, a sprocket 29 of the crankshaft output section 28 via the sprocket 26 and the chino 2T, and is driven thereby. The first pump 23 pumps the lubricating oil through the pipe line 30 and the first branch pipe 30.
A part of the lubricating oil is supplied to the shaft of the supercharger 14 through the shaft, and a lubricating oil discharge pipe 30b is connected to the shaft, which is then connected to the second pump through the check pulp 31. 24, and the second pump 24 is connected to an oil reservoir in the crankcase 11a. Therefore, the oil in the turbocharger shaft that has been forcibly lubricated by the pump 23 is sucked out by the pump 24 and returned to the oil reservoir. Since the pump 24 is coaxially driven together with the pump 23, depending on the pump capacity, the suction action may be excessive. In some cases, a pump that can reliably perform the pumping action even when air is inhaled is used. In FIG. 2, 32 is an oil strainer, 33 is a drain tube, and 49 is a waste gate valve.

In this way, the supercharger 14 is arranged while effectively utilizing the space below the front of the engine, and is also provided in a position close to the exhaust manifold, which is functionally advantageous. Pumps for forced lubrication and forced suction and discharge are provided at the front and rear, which is advantageous in terms of smoothness, and because they are driven coaxially, only one drive and transmission mechanism is required.

Therefore, it is possible to reduce the number of parts per item and make it more compact.

By the way, due to the above, there is an exhaust manifold 1 in front of the engine.
5b, 15b, merging part 15c, intake pipe 16°, and the pipe body of the charge pipe 18 are exposed, so a cover 34 is provided in front of the engine to cover the supercharger 14 and a part of the pipe body below it. In the example, an opening 34a is formed in the middle part in a U-shape, and covers the front lower part 34b, its both sides 34c, 34c, and side parts 34d, and the front lower part 34b is curved upward and backward to function as a current plate. And on the lower front front there is a fourth
As is clear from the figure, there are a plurality of vertical slit-shaped air guide ports 34e.
... are provided, and the air guide port 34e... is provided with air guide plates 34f..., 34q... that curve left and right, respectively, with the center as a boundary, so as to protrude rearward, so that the air guide port 34e... The board prevents mud etc. from entering the inside, and the side portion 34d is provided with air outlet ports 34h to the outside.

This is opened rearward by a guide plate 341.

The above cover 34 may be formed as a part of the lower part of the fairing 35, for example.

In the above, the supercharger 14 is connected to the prechamber 20 upstream of the carburetor 21 via the charge pipe 18, but the supercharger flows into the prechamber 20, and the pressure of the supercharger vaporizes the prechamber 20. Pressure is applied in the direction opposite to the container 21, in the rear direction with respect to the vaporizer 21 in front in the embodiment, and in the direction in which the connecting portions 36, 36 connecting the vaporizer and the bleed chamber are removed.

In the embodiment, as shown in FIG. 5, two cylinders are provided with a carburetor for each cylinder, which are arranged side by side in the left and right direction, and each has a carburetor upstream connecting portion 36.3 having one end penetrating the front wall 20a of the prechamber 20.
6, it is connected in communication with the chamber C. Prechamber 2
0 left and right side walls 20b.

In 2Qb, planar locking rods 37 each having an outwardly bent locking portion 37a at the tip are arranged symmetrically to each base 37b.
are fixed to the side walls 20b, 20b.

The inside of these locking rods 37 in the vehicle width direction (L type 21°2
1 is arranged. Left and right side walls 11 of the engine 11
b, 11b are symmetrically arranged with planar locking rods 3"8 each having an inward bent locking part 38a at the tip, and each base 38b is attached to the side wall '+1b, i1b. Fasten and locking rod 3
7 and 38 are the tip portions 37c of this.

38c wraps in the front-back direction 1, and the locking portion 37a.

38a is placed outside the egg in close proximity to the other party, and the tip 37
The locking portions 3 are spaced apart from each other in the front and back and face each other between c and 38c.
A solid damping material such as rubber 39 is interposed between 7a and 38c. As a result, the pre-chamber 20 is elastically supported on the engine side, and the pressure of the rubber 39 allows the pre-chamber 20 to be elastically supported by the locking portion 37a.
, 38a are pressed in the direction of separation, that is, the prechamber 20 is elastically pressed toward the carburetor 21 side, and the connection therebetween is made firm.

Prevents air leakage and damps pressure.

The carburetor 21 is equipped with a choke valve 40 on the upstream side of the intake passage and a throttle valve 41 on the downstream side, as shown in FIG. Fuel is supplied to the engine using, for example, an electromagnetic fuel pump.

A connecting pipe section 4 is connected to the downstream side of the intake path of the carburetor 21 toward the engine.
3 is provided protrudingly, and a flange portion 43& is formed at the downstream end of the flange portion 43&, and the upstream side surface of the flange portion 43a is formed in a tapered shape such that the outer diameter portion is thinner and the wall thickness is thicker in the inner diameter direction. , end face 4
3b is formed flat, while the intake pipe 4 on the engine side
A flange portion 44a is formed at the upstream end of the flange portion 4, and the flange portion 44a is shaped symmetrically with the flange portion Oa, and the end surface 44b is formed flat. These end surfaces 44b, 43b are faced and abutted, a sealing member such as an O-ring 45 is interposed between them, and in the abutting state, the flange parts 43a, 44a have a medium cross section with a thin outer diameter part, Band 4 around the outside of this
6. Wind and install. The band 46 is in the shape of a broken ring, has a chevron-shaped cross section, is made of a metal plate, has a rubber 47 with a chevron-shaped cross section affixed to its inner surface, and connects the outer diameter end of the flange at the top of the chevron. A projecting piece 4 is bent at the entrance of the band 46 and supports the front and rear slopes forming the outer surface of the flange portion.
Pass the screw between 6a and 46a and tighten the band. In this manner, the carburetor 21 is firmly connected to the engine side while maintaining a high degree of sealing performance. In the above, maintenance of the carburetor 21 is performed using the locking and rod 37.3B.
This is done by removing the band 46 and pulling it out to the side.

By the way, the pre-chamber 20 is
As shown in the cross-sectional plane, there are two air funnels 48.4 at the lower left and right sides of the front wall 20a that communicate with each carburetor 21.
8 spaced apart on the left and right.

The bottom wall 48a of the air funnel 48 is arranged in the same plane as the bottom wall 20c of the prechamber 20.

Rear bottom wall 20 at the rear of the air funnel upstream side of the bottom wall 20c
d is tilted upward to guide droplets adhering to the bottom wall 20d to the air funnel and prevent droplets from accumulating on the bottom. The charge pipe 18 described above is one, and its downstream end 18a is open-connected to a position biased toward the front side of the upper wall 20e, and the length of one air funnel 48-1 is set to .

The downstream end opening of the charge pipe 18 is faced above the earthen wall 48-1b. As a result, the pressurized air supplied from the charge pipe 18 into the prechamber 20 collides with the wall 48-1b and is distributed thereby, thereby distributing the air to the left and right air funnels, thus the carburetor and the engine. can improve sex.

As is clear from the above (according to the present invention, in a supercharged internal combustion engine such as a motorcycle, the supercharger can be disposed using the space in the lower part of the engine and in front of the engine, which is advantageous in terms of space utilization. In addition, it is advantageous in terms of layout because the equipment can be placed in the middle or upper front of the engine, increasing the degree of freedom in design.Furthermore, it is convenient because it is close to the engine exhaust system, and it is also convenient for the turbocharger. Separate lubricating oil supply and suction/discharge pumps are provided to ensure smooth lubrication of the supercharger, and since these pumps are driven by a single shaft, it is advantageous in terms of pump arrangement and space. It has many advantages such as being able to reduce the number of parts such as mechanisms.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic side view of a motorcycle, Fig. 2 is an enlarged view of the front part of the engine, Fig. 3 is a perspective view with a cover attached, and Fig. 4 is a schematic side view of the motorcycle. Figure 4 is an enlarged cross-sectional view of the main part of the cover, Figure 5 is a plan view of the carburetor and pre-chamber section, Figure 6 is an enlarged longitudinal cross-sectional side view of the main part of the connection between the carburetor and the engine, and Figure 7 is a perspective view of the band.
FIG. 8 is a vertical side view of the prechamber, and FIG. 9 is a cross-sectional plan view thereof. In the drawing, 1 is a motorcycle, 11 is an engine, 14 is a supercharger, 23.24 is a pump, 25 is a shaft, 26° 27.28
．． 29 is a driving means. Patent Applicant: Honda Motor Co., Ltd., 1st Engineer, 2nd 1) Kunihiko Ohashi, Figure 6, 4, Figure 8, Figure 9, U

Claims (1)

[Claims] In an internal combustion engine such as a motorcycle equipped with a supercharger, the supercharger is disposed at the front lower part of the engine, and an oil pump for supplying lubricating oil to the supercharger and an oil pump for sucking out lubricating oil from the supercharger are provided. An internal combustion engine with a supercharger, characterized in that the pumps are arranged near the supercharger, and each pump is driven coaxially.