JP3711589B2 - Carburetor insulation system for scooter type vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carburetor heat insulation device that prevents occurrence of icing in a carburetor.
[0002]
[Prior art]
In motorcycles, the engine is exposed to the outside, so when the engine is started under conditions where the temperature is low and humidity is high, the carburetor freezes due to the latent heat of vaporization caused by fuel vaporization and the cooling effect of the traveling wind. (Icing) may occur, and there is a risk that fuel (air mixture) cannot be satisfactorily supplied to the engine.
[0003]
Therefore, there is a carburetor that is provided with heating means such as a heater and energizes the heater to directly heat and keep the carburetor to prevent the occurrence of icing (first prior art).
[0004]
Further, as described in Japanese Utility Model Publication No. 58-34285, an air space is provided in the exhaust pipe of the engine, and the traveling wind is guided to the air space and heated by exhaust heat. Is supplied to a box surrounding the carburetor to heat the carburetor and keep it warm (second prior art).
[0005]
Further, as in the invention described in JP-A-2-21370, there is a forced air-cooled engine in which cooling air heated by heating the engine is supplied to the carburetor to heat and keep the carburetor (No. 1). 3 prior art).
[0006]
[Problems to be solved by the invention]
However, in the first conventional example, although the carburetor is kept warm by the direct heating of the carburetor by the heater, the cost is high, the wiring of the electric wire is troublesome, and in the unlikely event, there is a risk of disconnection.
[0007]
In the first prior art, since the engine of the motorcycle is installed below the vehicle, the heater installed on the carburetor is likely to be covered with water and mud while the vehicle is running. Adequate waterproofing measures must be taken.
[0008]
In the second prior art, since the running wind cannot be secured when the engine is stopped, the carburetor icing may occur frequently at the start of the engine, particularly in winter. Even when the vehicle is traveling, it may be difficult to satisfactorily capture the traveling wind into the air space. In such a case, there is a possibility that icing of the carburetor cannot be sufficiently prevented.
[0009]
Further, in the third prior art, the cooling air of the forced air cooling engine mainly cools the cylinder and the cylinder head, but the cylinder and the cylinder head are not heated when the engine is started. For this reason, even if the cooling air after cylinder cooling is used at the time of starting the engine, the carburetor cannot be heated sufficiently, and icing of the carburetor cannot be reliably prevented.
[0010]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a carburetor heat insulation device that can reliably prevent the occurrence of icing by keeping the carburetor warm.
[0011]
[Means for Solving the Problems]
The invention according to claim 1, together with indented to lower between the handle and the seat lay step board, comprising a rear body which also serves as a storage box on the sheet downward, the bottom of this rear body, the rear of the cylinder A unit swing type engine that is composed of a forced air-cooled engine with a continuous crankcase and a swing case that is connected from one side of the crankcase to the rear and pivotally supports the rear wheel is disposed at the rear of the unit swing. A type engine is pivotally supported by a suspension boss on a vehicle body frame via a suspension bracket, while an inlet pipe is connected to the front upper part of the crankcase, and a carburetor and an air cleaner are sequentially connected to the inlet pipe for intake. Scooter type car that constitutes the system and has an exhaust pipe extended from the cylinder In the carburetor heat insulating device, provided with a heating chamber for the engine as a heat source to the front of the engine, and the heating chamber, the outer side in the vehicle width direction toward to the rear wheel a rear in plan view of the engine In addition, a lead-out pipe extending in the front-rear direction from the front to the rear of the vehicle is interposed between the carburetor arranged on the vehicle rear side of the suspension boss, and the cooling air of the forced air-cooled engine is interposed through the lead-out pipe. A part of the carburetor is guided from the heating chamber toward the carburetor, and then discharged from the space surrounded by the storage box, the air cleaner, and the rear wheel to keep the carburetor warm. is there.
[0012]
According to a second aspect of the invention, together with and indented to lower between the handle and the seat lay step board, comprising a rear body which also serves as a storage box on the sheet downward, the bottom of this rear body, the rear of the cylinder A unit swing type engine that is composed of a forced air-cooled engine with a continuous crankcase and a swing case that is connected from one side of the crankcase to the rear and pivotally supports the rear wheel is disposed at the rear of the unit swing. A type engine is pivotally supported by a suspension boss on a vehicle body frame via a suspension bracket, while an inlet pipe is connected to the front upper part of the crankcase, and a carburetor and an air cleaner are sequentially connected to the inlet pipe for intake. Scooter type car that constitutes the system and has an exhaust pipe extended from the cylinder In the carburetor heat retention device, the carburetor disposed on the vehicle width direction outer side with respect to the rear wheel and on the vehicle rear side with respect to the suspension boss in a plan view is covered with a carburetor cover to constitute a warming room, and the exhaust pipe of the exhaust pipe A heating chamber is formed by covering the surroundings with a heating chamber cover, and these holding chambers and heating chambers are connected by outlet piping, and a part of the cooling air of the forced air-cooled engine is led to the heating chamber and heated. Then, this overheated cooling air is guided to the warming room via the outlet pipe extending toward the rear side of the vehicle, and then from the space surrounded by the storage box, the air cleaner, and the rear wheel to the rear of the vehicle. The carburetor is configured to be kept warm by discharging.
[0015]
The inventions described in claims 1 and 2 have the following effects.
[0016]
A part of the forced cooling air is heated in the heating chamber around the exhaust pipe and then guided to the carburetor to heat and keep the carburetor. Therefore, even if the engine is operated while the vehicle is stopped, The carburetor can be reliably kept warm by using the section. For this reason, even when it is cold, the occurrence of icing in the carburetor can be prevented.
[0017]
In addition, a heating air for heating a part of the forced cooling air is formed around the exhaust pipe, and the exhaust pipe is heated before the cylinder and the cylinder head are heated at the time of starting the engine. The carburetor can be heated and kept warm. For this reason, it is possible to prevent the occurrence of icing of the carburetor even immediately after the engine is started in cold weather.
[0018]
In the heating chamber heated around the exhaust pipe, a part of the forced cooling air is heated by heat exchange with the heated exhaust pipe, and the carburetor is heated and kept warm by a part of the heated forced cooling air. Therefore, the electrical trouble due to mud and water that occurs when the carburetor is directly heated and kept warm by an electric heating means such as a heater does not occur, and the cost can be reduced.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
(First embodiment)
FIG. 1 is a side view of a scooter type motorcycle equipped with a unit swing type engine to which a first embodiment of a carburetor heat retention device according to the present invention is applied. FIG. 2 is a plan view showing the scooter type motorcycle of FIG. FIG. 3 is a bottom view of the scooter type motorcycle of FIG.
[0025]
In the scooter type motorcycle 10, a front wheel 12 that is steered by a handle 11 and a rear wheel 14 that is driven by an engine 13 are arranged at the front and rear. 16 is laid. The seat 15 is placed on a rear body 18 that also serves as a storage box 17, and the engine 13 is installed below the rear body 18.
[0026]
The engine 13 is a unit swing type engine. A crankcase 20 is connected to a rear side of a cylinder 19 tilted substantially horizontally, and a swing case 21 is connected from one side of the crankcase 20 to the rear side. The rear wheel 14 is pivotally supported at the rear portion of the case 21. The rear wheel 14 is disposed immediately behind the swing case 21.
[0027]
The above-described unit swing type engine 13 has a suspension boss 22 formed at the front and lower portion, and this suspension boss 22 is pivotally supported on the vehicle body frame 25 via a suspension bracket 24 so that the unit swing type engine 13 swings in the vertical direction. It is supported movably. Further, the swing case 21 of the unit swing type engine 13 is supported on the vehicle body frame 25 by the rear cushion unit 26, and the unit swing type engine 13 is buffered and suspended.
[0028]
In the unit swing type engine 13, the inlet pipe 27 is connected to the front upper part of the crankcase 20, and the carburetor 28 and the air cleaner 29 are sequentially connected to the inlet pipe 27 to constitute an intake system. Further, an exhaust pipe 30 is extended from the cylinder 19. The exhaust pipe 30 extends from the lower side of the cylinder 19 to the rear of the vehicle, and a muffler 31 is connected to the end.
[0029]
The unit swing type engine 13 is a forced air-cooled engine, the cylinder 19 and the cylinder head 32 are covered with a wind guide cowling 33, and a fan casing 34 is attached to one side of the crankcase 20. The fan casing 34 covers a cooling fan 35 that is pivotally supported at one end of a crankshaft (not shown), and communicates with a wind guide cowling 33 to form a cooling chamber 35A. Most of the cooling air 36 generated by the cooling fan 35 is guided to the cylinder 19 and the cylinder head 32 to forcibly cool the cylinder 19 and the cylinder head 32.
[0030]
The unit swing type engine 13 is provided with an ignition ignition coil 37 at one front part of the crankcase 20, and an oil pump 38 for lubricating each part of the engine 13 at the front upper part of the crankcase 20. Is arranged. Further, the rear wheel 14 is covered with a rear fender 39 supported by the swing case 21.
[0031]
Now, as shown in FIG. 2 in particular, a heating chamber cover 40 that covers the entire outer periphery of the exhaust pipe 30 is disposed on the upstream side of the exhaust pipe 30. Both ends of the heating chamber cover 40 are closed, and a substantially airtight heating chamber 41 is formed between the exhaust pipe 30 and the heating chamber cover 40. An introduction pipe 42 is connected between the heating chamber cover 40 and the wind guide cowling 33, and a part of the cooling air 36 in the cooling chamber 35 </ b> A is introduced into the heating chamber 41 through the introduction pipe 42. The cooling air 36 introduced into the heating chamber 41 is heated to heat air 49 by heat exchange with the exhaust pipe 30.
[0032]
On the other hand, the carburetor 28 is covered with a carburetor cover 44 having an opening 43 on the rear side of the vehicle body. In this embodiment, the carburetor cover 44 is fixed to at least one of the air cleaner 29 or the rear fender 39, and constitutes a warming chamber 45 surrounding the carburetor 28. In addition, a lead-out pipe 46 is connected between the carburetor cover 44 and the heating chamber 40, and a part of the cooling air (hot air 49) heated in the heating chamber 41 passes through the lead-out pipe 46. Derived into.
[0033]
Here, the heating chamber cover 40, the wind guide cowling 33 and the carburetor cover 44 are disposed in the vicinity of the suspension boss 22. For this reason, even if the unit swing type engine 13 swings up and down around the suspension boss 22 when the rear cushion unit 26 expands and contracts, the introduction pipe 42 that connects the wind guide cowling 33 and the heating chamber cover 40, and heating The detachment (disconnection) of the outlet pipe 46 that connects the chamber cover 41 and the carburetor cover 44 can be prevented.
[0034]
In particular, as shown in FIGS. 1 and 3, the body frame 25 is provided with a protective cover 47 in front of the heating chamber cover 40. The stepping stone 48 kicked up by the front wheel 12 collides with the protective cover 47, and the carburetor 28, the heating chamber cover 40, the introduction pipe 42 and the outlet pipe 46 are protected from the stepping stone 48.
[0035]
Next, the operation will be described.
[0036]
The exhaust gas generated by the operation of the unit swing type engine 13 is discharged through the exhaust pipe 30. During this time, the exhaust pipe 30 is heated by the exhaust gas. Further, the cooling fan 35 rotates during operation of the unit swing type engine 13, and the cooling air 36 is directed toward the cylinder 19 and the cylinder head 32 in the cooling chamber 35 </ b> A surrounded by the air guide cowling 33 and the fan casing 34. The cylinder 19 and the cylinder head 32 are cooled, and a part of the cooling air 36 in the cooling chamber 35A is introduced into the heating chamber 41 through the introduction pipe 42.
[0037]
A part of the cooling air 36 introduced into the heating chamber 41 is heated by exchanging heat with the exhaust pipe 30 heated by the exhaust gas to become hot air 49, and is led out to the warming chamber 45 through the outlet pipe 46. . In the warming room 45, the warm air 49 heats and keeps the carburetor 28, thereby preventing the occurrence of icing in the carburetor 28. The warm air 48 that heats and keeps the carburetor 28 is discharged from the opening 43 of the carburetor cover 44 to the rear of the vehicle.
[0038]
According to the above-described embodiment, a part of the forced cooling air 36 is heated in the heating chamber 41 around the exhaust pipe 30 to form the hot air 49, and then led to the warming room 45 surrounding the carburetor 28. Since the unit 28 is heated and kept warm, even when the unit swing type engine 13 is operated while the vehicle is stopped, the carburetor 28 can be reliably kept warm by using a part of the forced cooling air 36. For this reason, even when it is cold, the occurrence of icing in the carburetor can be prevented.
[0039]
Further, a heating chamber 41 for heating a part of the forced cooling air 36 is formed around the exhaust pipe 30 by a heating chamber cover 40. The exhaust pipe 30 is formed by heating the cylinder 19 and the cylinder head 32 when the engine is started. The carburetor 28 can be heated and kept warm immediately after the engine is started. For this reason, it is possible to prevent the occurrence of icing in the carburetor 28 even immediately after engine startup in cold weather.
[0040]
Further, the heating chamber 41 formed by the heating chamber cover 40 around the exhaust pipe 30 heats a part of the forced cooling air 36 by heat exchange with the heated exhaust pipe 30, and the heated forced cooling air is heated. Since the carburetor 28 is heated and kept warm by a part (warm air 49) of 36, mud and water generated in the case of the first prior art in which the carburetor 28 is directly heated and kept warm by an electric heating means such as a heater. Thus, no electrical trouble is caused and the cost can be reduced.
[0041]
Further, since the carburetor cover 44 and the heating chamber cover 40 are disposed in the vicinity of the suspension boss 22, the heating chamber cover 40 and the carburetor cover 44 are also provided even when the unit swing type engine 13 swings around the suspension boss 22. The connected lead-in pipe 42 and lead-out pipe 46 do not come off and come off.
[0042]
In addition, since the carburetor 28 is in the warming chamber 45 covered with the carburetor cover 44 having the opening 43, the warm air 49 led from the outlet pipe 46 has a longer time to flow around the carburetor 28, and the carburetor 28 28 can be sufficiently heated, and the heat retention effect of the carburetor 28 can be enhanced.
[0043]
Further, since the protective cover 47 is installed in front of the heating chamber cover 40, a stepping stone 48 from the front wheel 12 of the vehicle collides with the protective cover 47, and the exhaust pipe 30, the heating chamber cover 40, the introduction pipe 42, and the lead-out. The piping 46 and the like can be protected from the stepping stone 48 and the like.
[0046]
【The invention's effect】
As described above, according to the carburetor heat retention device according to the present invention, it is possible to reliably prevent the occurrence of icing by keeping the carburetor warm.
[Brief description of the drawings]
FIG. 1 is a side view of a scooter type motorcycle equipped with a unit swing type engine to which a carburetor heat retention device according to the present invention is applied .
2 is a plan view showing the scooter type motorcycle of FIG. 1. FIG.
3 is a bottom view of the scooter type motorcycle of FIG. 1. FIG.
[Explanation of symbols]
13 Unit swing type engine 25 Body frame 28 Carburetor 29 Air cleaner 30 Exhaust pipe 33 Air guide cowling 34 Fan casing 35 Cooling fan 35A Cooling chamber 36 Cooling air 40 Heating chamber cover 41 Heating chamber 42 Introducing piping 43 Opening 44 Carburetor cover 45 46 Lead piping 47 Protective cover 48 Stepping stone 49 Hot air

Claims (2)

A forced air-cooled engine with a rear body that also serves as a storage box under the seat, with a step board with a low gap between the handle and the seat, and a crankcase connected to the rear of the cylinder at the bottom of the rear body. A unit swing type engine that is connected to the rear side from one side of the crankcase and includes a swing case that pivotally supports the rear wheel is disposed at the rear part thereof, and the unit swing type engine is suspended by a suspension boss. In addition, an inlet pipe is connected to the front upper part of the crankcase, and a carburetor and an air cleaner are sequentially connected to the inlet pipe to form an intake system. As a carburetor insulation device for scooter type vehicles with extended exhaust pipes There are, provided with a heating chamber for the engine as a heat source to the front of the engine, and the heating chamber, the rear and a by vehicle width direction outboard and to the rear wheel in a plan view the suspension boss of the engine A lead-out pipe extending in the front-rear direction from the front to the rear of the vehicle is interposed between the carburetor arranged on the rear side of the vehicle and a part of the cooling air of the forced air-cooled engine is passed through the lead-out pipe. A scooter configured to guide the carburetor from the heating chamber toward the carburetor, and then to keep the carburetor warm by discharging the vehicle from the space surrounded by the storage box, the air cleaner, and the rear wheel. Type vehicle carburetor insulation device. A forced air-cooled engine with a rear body that also serves as a storage box under the seat, with a step board with a low gap between the handle and the seat, and a crankcase connected to the rear of the cylinder at the bottom of the rear body. A unit swing type engine that is connected to the rear side from one side of the crankcase and includes a swing case that pivotally supports the rear wheel is disposed at the rear part thereof, and the unit swing type engine is suspended by a suspension boss. In addition, an inlet pipe is connected to the front upper part of the crankcase, and a carburetor and an air cleaner are sequentially connected to the inlet pipe to form an intake system. As a carburetor insulation device for scooter type vehicles with extended exhaust pipes The carburetor disposed in the vehicle width direction outer side with respect to the rear wheel and in the vehicle rear side with respect to the rear boss in a plan view is covered with a carburetor cover to constitute a warming room, and the exhaust pipe is surrounded by a heating chamber. A heating chamber is formed by covering with a cover, and the thermal insulation chamber and the heating chamber are connected by a lead-out pipe, and a part of the cooling air of the forced air-cooled engine is guided to the heating chamber to be heated. The cooled cooling air is guided to the warming room through the outlet pipe extending toward the rear side of the vehicle, and then discharged to the rear of the vehicle from the space surrounded by the storage box, the air cleaner, and the rear wheel. A carburetor heat retention device for a scooter type vehicle, wherein the carburetor is configured to retain heat.

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