JPH08151926A - Motorcycle supercharger - Google Patents

Abstract

PURPOSE: To avert an adverse influence on engine performance by preventing lubricating oil in pressurized air from flowing into the engine. CONSTITUTION: A motorcycle supercharger is provided with a connecting rod supercharging mechanism 33a for compressing intake air by means of rocking of a connecting rod, an air cleaner 35 for filtering air to the supercharging mechanism 33a, an intercooler 36 for cooling pressurized air from the supercharging mechanism 33a and a supercharge tank 37 for storing pressurized air from the intercooler 36. The pressurized air outlet 36b of the intercooler 36 is provided in upper side more than the upward and downward direction center of the intercooler 36 and an oil reservoir 36g is formed in the bottom part of the intercooler 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharging device for a motorcycle equipped with a connecting rod supercharging mechanism.

[0002]

2. Description of the Related Art In recent years, for the purpose of improving the engine output, a supercharger equipped with a connecting rod supercharging mechanism for compressing air sucked into a crank chamber by swinging the connecting rod and supplying the compressed air to a combustion chamber. Have been proposed (for example,
See JP-A-6-93869).

In the above supercharging device, an air cleaner for filtering the air to the connecting rod supercharging mechanism, an intercooler for cooling the air whose temperature has risen due to pressurization, and a super suppressor for suppressing the pressure fluctuation of the pressurized air supplied to the cylinders. It requires a considerable arrangement space such as a water supply tank and requires components to be connected to each other by an intake pipe or the like.

[0004]

By the way, in the supercharger having the above-mentioned connecting rod supercharging mechanism, depending on the arrangement of the intake pipe connecting the supercharging mechanism, the intercooler, and the supercharging tank, pressurized air may be added. The mixed lubricating oil may flow into the engine, possibly adversely affecting the engine performance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a supercharging device for a motorcycle capable of preventing the lubricating oil from flowing into the engine and avoiding an adverse effect on the engine performance. .

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a connecting rod supercharging mechanism for compressing intake air by swinging the connecting rod, an air cleaner for filtering air to the supercharging mechanism, and pressurized air from the supercharging mechanism. An intercooler that cools the intercooler and a supercharging tank that stores the pressurized air from the intercooler. Is a supercharging device for a motorcycle.

[0007]

According to the supercharger for a motorcycle according to the present invention,
Since the pressurized air outlet of the intercooler is located above the center of the intercooler in the vertical direction, the lubricating oil is separated from the pressurized air by the weight of the intercooler and drips. Air can be supplied to the supercharging tank. As a result, the inflow to the engine can be prevented, and the adverse effect on the engine performance can be avoided. Also,
In the present invention, since the oil sump is formed at the bottom of the intercooler, the dropped lubricating oil can be easily collected or discharged.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 7 are views for explaining a supercharging device for a scooter type motorcycle according to an embodiment of the present invention, and FIGS. 1 to 3 are a side view, a plan view and a rear view of the device of the present embodiment, respectively. FIG. 4, FIG. 4 is a side view of a scooter type motorcycle to which the device of this embodiment is applied, FIGS. 5 and 6 are schematic views showing the positional relationship of supercharger component parts, air flow, etc., and FIG. It is a partial cross-section front view of the intercooler of an example apparatus. In the present specification, left and right mean left and right as viewed in the traveling direction of the vehicle.

In the figure, reference numeral 1 is a scooter type motorcycle to which the device of this embodiment is applied, and a vehicle body frame 2 of the motorcycle.
Is an underbone type, and the head pipe 2a is connected to the upper end of a main frame 2b that is substantially L-shaped in side view, and the left and right side frames 2 are paired to the lower end of the main frame 2b.
The front ends of c and 2c are connected to each other, the both side frames 2c are erected upward, and further extended rearward. A front fork 4 which pivotally supports the front wheel 3 at its lower end is pivotally supported to the left and right on the head pipe 2a, and a steering handle 5 is fixed to the upper end of the front fork 4.

A periphery of the steering handle 5 is covered with a handle cover 6, and a periphery of the head pipe 2a is covered with a front cover 7 having a two-part structure of a front cover 7a and a rear cover 7b. Further, a footboard 8 forming a footrest portion is arranged at a connecting portion between the main frame 2b and the side frame 2c, and side covers 9 are arranged on the left and right sides of the side frame 2c. . A seat 10 is arranged above the side cover 9, and a storage box 11 and a fuel tank 12 are provided below the seat 10.
Is installed.

A unit swing type engine unit 15 is mounted near the lower side of the upper bent portion of the left and right side frames 2c. The engine unit 15 includes an engine main body 17 suspended and supported by a pivot shaft 16 that is erected between the side frames 2c, 2c via a bracket 14 so as to be vertically swingable, and a rear portion on the left side of the engine main body 17 in the rearward direction. And a rear wheel transmission 18 integrally formed so as to extend, and a belt drive type continuously variable transmission mechanism is built in the transmission 18, and a rear wheel 19 is pivotally supported at a rear end portion thereof. There is. Further, the rear wheel transmission 18
The lower end of the rear suspension 20 is pivotally supported on the upper surface of the rear end of the transmission case 18a, and the upper end of the rear suspension 20 is pivotally supported by the side frame 2c.

The engine body 17 is a forced-air cooling type 4-cycle single-cylinder type engine.
A cylinder block 22 and a cylinder head 23 are connected to the cylinder block 22, and a piston 24 is slidably inserted and arranged in the cylinder bore of the cylinder block 22, and the piston 24 is connected to a crank pin 26a of a crank shaft 26 by a connecting rod 25. It is of structure. A drive pulley (not shown) is mounted on the left end of the crankshaft 26, and a forced cooling fan 51 for supplying cooling air to the engine body 17 is mounted on the right end. The engine body 17 is surrounded by an air shroud 50. When the cooling air a sucked by the cooling fan 51 passes between the engine body 17 and the air shroud 50, the cylinder head 23, the cylinder Block 2
2 and the like are cooled and discharged from the outlet 50a.
Reference numerals 22a and 23c denote a cylinder block cooling fin and a cylinder head cooling fin, respectively, for increasing the heat radiation area.

An exhaust pipe 28 is connected to the exhaust port 23a led out to the lower surface of the cylinder head 23, and a muffler 29 arranged on the right side of the rear wheel 19 is connected to the rear end of the exhaust pipe 28. Has been done. An intake manifold 30 is connected to an intake port 23b led out to the upper surface of the cylinder head 23, and a carburetor 31 arranged on the upper surface of the cylinder block 22 is connected to an upstream end of the intake manifold 30. ing. An oil tank 32 is arranged on the right side of the vaporizer 31. The exhaust port 23a and the intake port 23b are connected to the exhaust valve 111 and the intake valve 11 respectively.
The valves 111 and 110 are opened and closed by the camshaft 112 via the exhaust and intake side tappets 114 and 113.

The engine unit 15 is provided with a connecting rod supercharging device 33. The supercharging device 33 includes a connecting rod supercharging mechanism 33a and the supercharging mechanism 3a.
3a, an air cleaner 35 for filtering air, and an intercooler 36 for cooling compressed air from the supercharging mechanism 33a.
And a supercharge tank 37 for suppressing the pressure fluctuation of the compressed air supplied to the cylinder bore by storing the compressed air from the intercooler 36, and these supercharger constituent parts 35 to 37 are all above-mentioned. The unit swing type engine unit 15 is mounted so as to swing together with the unit 15.

The connecting rod supercharging mechanism 33a divides the crank chamber into an intake chamber A and a compression chamber B by slidably contacting the connecting rod 25 and the crank web 26b with the inner peripheral wall of the crank case 21.
21a communicating with the suction chamber A at the lower part of the left side wall of the
And a discharge port 21b communicating with the compression chamber B is formed in the upper part of the right side wall. This constitutes a positive displacement supercharger that compresses the air taken in by the swing of the connecting rod 25. Incidentally, such a structure is described in detail in the above-mentioned JP-A-6-93869.

A lubricating device 100 is connected to the connecting rod supercharging mechanism 33a. This lubrication device 100
Sucks and pressurizes the lubricating oil from the oil tank 32 by the oil pump 102 through the oil strainer 101, and slides the pressurized lubricating oil through the delivery pipe 103 such as the connecting rod 25 and the crank web 26b. The lubricating oil supplied to the surface is collected in an oil drain return pipe 105 having a check valve 104 and collected for recycling among the supplied lubricating oil at the bottom of the crankcase 21.

Here, the connecting rod supercharging mechanism 3 of this embodiment is used.
In 3a, the compression chamber B having a high supercharging pressure is arranged on the upper side, and the suction chamber A is arranged on the lower side. The air sucked from below the crankcase 21 is pressurized and discharged from above. Therefore, the lubricating oil supplied by the lubricating device 100 is easily and reliably separated by its own weight in the crank chamber, and it is possible to prevent the lubricating oil from being mixed in the pressurized air. In addition, the separated lubricating oil also functions as a sealant between the sliding surface of the connecting rod or the like and the wall surface in the crankcase 21, so that airtightness is improved and supercharging pressure is increased.

The air cleaner 35 has a substantially triangular shape in a side view, and has an air cleaner element 35 inside.
a, and is arranged in a corner portion of the cylinder block 22, the left side wall of the cylinder head 23 and the front wall of the transmission case 18a in plan view, and is bolted and fixed to the transmission case 18a and the crankcase 21. . The suction port 35a of the air cleaner 35 is opened inside the side cover 9 toward the inside of the vehicle body, and the discharge port 35b is located at the lower part. The discharge port 35b is connected to the suction port 21a of the crankcase 21 by an air introducing pipe 40.

Since the air passing through the air cleaner 35 flows downward from above and is introduced into the supercharging mechanism 33a, it is possible to prevent the air cleaner element from being contaminated with lubricating oil due to the blowback of the intake air from the crank chamber. Further, since the discharge port 35b of the air cleaner 35 is located near the suction port 21a of the supercharging mechanism 33a, the air introduction pipe 40
The passage length can be shortened, and the suction resistance can be reduced accordingly. Therefore, the supercharging pressure becomes high, and the engine performance can be improved. Furthermore, since the suction port 35a of the air cleaner 35 is open at the upper part inside the side cover 9, it is possible to prevent rainwater and the like from entering the air cleaner 35.

The intercooler 36 is a box-shaped air-cooling type having a substantially rectangular shape in a side view, and is arranged so as to cover the above-mentioned suction port 51a of the cooling fan 51 on the right side of the crankcase 21, and a bracket (not shown) is used. It is fixed to the engine body 17 through the above. As a result, the air introduced for cooling the engine is also used as the cooling air for the intercooler 36. Therefore, the electric fan for cooling the intercooler can be eliminated, and the cost can be reduced.

The intercooler 36 has inlet and outlet headers 36d and 3 at both ends of a large number of flat plate cooling pipes 36c.
6e, the cooling pipe 36c is inserted and opened.
Further, the cooling fin 36f for increasing the heat radiation area is arranged. An oil sump 36g is formed at the bottom of the intercooler 36, and a drain drain plug 41 is attached to the bottom wall of the oil sump 36g.

Inlet header 36d of the intercooler 36
A pressurized air inlet 36a is formed at the upper end of the. The pressurized air inlet 36a is communicatively connected to the discharge port 21b of the crankcase 21 by an inlet side intake pipe 42,
A reed valve 115 for preventing backflow of pressurized air into the crankcase 21 is provided at the connecting portion. Further, a pressurized air outlet 36b is formed at the upper end portion of the outlet header 36e, and the pressurized air outlet 36b is formed in the outlet intake pipe 43 and the crankcase 21 and is a communication passage 21c (see FIG. 6). Is connected to a pressurized air introduction port 37a of a supercharging tank 37 described later via (not shown). As described above, the pressurized air inlet 36a and the outlet 36b are located above the center of the intercooler 36 in the vertical direction,
As a result, the lubricating oil drops in the intercooler 36 by its own weight and collects in the oil sump 36g.

The supercharging tank 37 is arranged between the rear wheel transmission 18 and the side frame 2c, and is bolted and fixed to the upper surface of the transmission case 18a. The supercharging tank 37 has a hollow inside, and the bottom portion of the supercharging tank 37 is an oil reservoir. The drain wall has a drain drain plug 3
7c is attached.

An inlet 37 is provided on the bottom wall of the supercharging tank 37.
a is formed, and the upstream opening end of the introduction port 37a is located above the oil reservoir. A pressurized air outlet 37b is formed on the inner wall of the upper portion of the supercharging tank 37, and the outlet 37b is connected to the crankcase 2
1 by the intake pipe 45 arranged above the carburetor 31
It is connected to the. Thus, the outlet 37b is located above the center of the supercharging tank 37 in the vertical direction,
Similar to the above, the lubricating oil drops by its own weight and collects in the oil sump.

The supercharging tank 37 and the vaporizer 31 are located at substantially the same height. Therefore, the shape of the intake pipe 45 can be simplified and the degree of freedom of the shape can be improved. Further, since the supercharging tank 37 is arranged on the transmission case 18a side, that is, on the side opposite to the muffler 29, even if the lubricating oil accumulated in the supercharging tank 37 oozes out, it does not reach the muffler 29 and white smoke is generated. Can be prevented.

Next, the function and effect of this embodiment will be described. In the supercharging device 33 of the present embodiment, the air filtered by the air cleaner 35 is swung by the connecting rod 25 to cause the introduction pipe 4 to flow.
0 is sucked into the crankcase 21 and compressed, and the compressed air is pumped from the intake pipe 42 into the intercooler 36. The compressed air cooled by the intercooler 36 passes through the intake pipe 43 and the communication passage 21c. And is pumped to the supercharging tank 37 for storage. Then, the compressed air in the supercharging tank 37 is supplied to the carburetor 31 through the intake pipe 45, where it becomes a mixture and is supplied from the intake manifold 30 to the combustion chamber. Then, the exhaust gas is discharged from the muffler 29 through the exhaust pipe 28 (see the broken line arrow in FIGS. 1 to 3).

In the apparatus of this embodiment operating in this way, the pressurized air outlet 36b of the intercooler 36 is located at the upper end of the intercooler 36, so that the lubricating oil is separated from the pressurized air in the intercooler 36 by its own weight. Then, the oil is dropped and stored in the oil sump 36 g. Therefore, the pressurized air not mixed with the lubricating oil can be supplied to the supercharging tank 37, and the adverse effect on the engine performance due to the inflow of the lubricating oil can be avoided. Further, the drain collected in the oil sump 36g of the intercooler 36 can be easily discharged from the plug 41. Here, in the present embodiment, the pressurized air inlet 36a is also provided above the intercooler 36, and from this point, the intercooler 36a is provided.
The lubricating oil separated inside does not flow back into the supercharging mechanism 33a. However, the pressurized air inlet 36a may be provided, for example, below the intercooler.

Further, in this embodiment, since the outlet 37a of the supercharging tank 37 is located above the supercharging tank 37, when the lubricating oil not separated in the intercooler 36 flows in, The oil is separated by its own weight in the supercharging tank 37 in the same manner as described above, and the inflow to the carburetor 31 can be further suppressed, and from this point as well, adverse effects on the engine performance can be avoided.

Further, in this embodiment, since the air cleaner 35, the intercooler 36, and the supercharging tank 37 which constitute the supercharging device 33 are fixedly arranged on the unit swing type engine unit 15 itself, the engine unit 15 can be vertically swung. Accordingly, the components 35 to 37 also swing at the same time,
Therefore, there is no relative movement between each component, and each component 35
It is not necessary to provide flexibility in connecting the to ~ 37 in communication, and the wiring structure can be simplified. Further, a material having rigidity and strength can be adopted for each of the pipes 40, 42 to 45, and the mounting strength of the entire device can be improved.

Since the above-mentioned components 35 to 37 are mounted on the engine unit 15 itself, the air cleaner 35 is attached to the cylinder block 21 and the transmission case 18a.
The intercooler 36 to the right of the crankcase 21, and the supercharging tank 37 to the transmission case 1
The empty space around the engine, such as between 8a and the side frame 2c, can be effectively arranged and concentrated, and the entire supercharging device can be made compact.

In the above embodiment, the case where the invention is applied to a scooter type motorcycle has been described as an example, but the present invention is not limited to this, and a motorcycle equipped with a unit swing type engine and an engine unit are used as a vehicle body frame. It can be applied to any motorcycle such as a motorcycle fixed to.

[0032]

As described above, according to the supercharger for a motorcycle of the present invention, the pressurized air outlet of the intercooler is provided above the center of the intercooler in the vertical direction, and
Since the oil sump is formed at the bottom, the lubricating oil is separated by its own weight in the intercooler and stored in the oil sump. As a result, there is an effect that the adverse effect on the engine performance due to the inflow of the lubricating oil can be avoided. The drain accumulated in the reservoir can be easily collected or discharged.

[Brief description of drawings]

FIG. 1 is a side view for explaining a supercharging device for a motorcycle according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus of the embodiment.

FIG. 3 is a rear view of the embodiment device.

FIG. 4 is a side view of a scooter type motorcycle to which the device of the embodiment is applied.

FIG. 5 is a schematic cross-sectional rear view of the motorcycle of the embodiment.

FIG. 6 is a schematic side view of the apparatus according to the embodiment.

FIG. 7 is a side view of an intercooler of the apparatus of the above embodiment.

[Explanation of symbols]

 1 scooter type motorcycle 25 connecting rod 33 supercharging device 33a connecting rod supercharging mechanism 35 air cleaner 36 intercooler 36b pressurized air outlet 36g oil sump 37 supercharging tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02B 33/44 H

Claims (1)

[Claims] 1. A connecting rod supercharging mechanism that compresses intake air by swinging the connecting rod, an air cleaner that filters air to the supercharging mechanism, an intercooler that cools pressurized air from the supercharging mechanism, and the intercooler. And a supercharging tank for storing pressurized air from the intercooler, the pressurized air outlet of the intercooler is provided above the center of the intercooler in the vertical direction, and the oil pool is formed at the bottom of the intercooler. Supercharger for motorcycles.