JPS6270651A - Icing prevention device for carburator - Google Patents

Abstract

PURPOSE:To prevent water and the like from being stuck on a heat transfer member so as to restrain the loss in heat by covering the heat transfer member with a protective cover which is of heat insulation and of heat resistance in a device where the heat transfer member is provided between a heating unit of a vehicle and a carburator. CONSTITUTION:The titled device is provided to a heat pipe 20 acting as a heat transfer member which connects an exhaust pipe 15 acting as a heating unit of a vehicle where the exhaust pipe is connected to an exhaust gas outlet port of an engine 9 installed on a motor-cycle with a carburator 17 provided in a suction pipe 16. And the heat of exhaust gas passing through the exhaust pipe 15 is transferred from a heat receiving bracket 21 to a heat dissipating bracket 22 attached to the upper section of the carburator 17 through the heat pipe 20 for heating the carburator 17 so as to prevent icing (freezing). In this case, the heat pipe 20 is provided with a protective cover 24 made of a rubber pipe which is of heat insulation and of heat resistance for preventing the heat pipe 20 from being damaged by running wind, water and the like sprashed by wheels so as to restrain the loss in heat.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a carburetor attached to a vehicle engine, and more particularly to a carburetor icing prevention device.

(Prior Art) In general, in vehicles such as motorcycles that use gasoline as fuel, gasoline is atomized and mixed with air prior to combustion in order to make the gasoline easier to burn. A vaporizer is used as the device.

By the way, in the above-mentioned vaporizer, some of the gasoline vaporizes inside the vaporizer, and the air temperature inside the vaporizer is taken away by the latent heat of vaporization at this time, causing the moisture in the air to cool and freeze, which is called icing. Phenomena may occur.

In this case, the nozzle of the carburetor freezes, leading to a shortage of gasoline and causing the engine to malfunction.

Therefore, it has been proposed to transfer the heat of the exhaust pipe, which is the heat generating part of the vehicle, to the carburetor via a heat transfer member, and to prevent icing of the carburetor using this heat (for example, this applicant's JP-A-56-101047).

(Problems to be Solved by the Invention) However, since the heat transfer member in the above-mentioned conventional configuration is bare, the heat transfer member is cooled by the wind while the vehicle is running, causing heat loss. There is. Further, especially in a motorcycle, since this heat transfer member is exposed to the outside of the vehicle, there is a risk that pebbles or the like may collide with the heat transfer member during the above-mentioned driving and damage the heat transfer member.

(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and is intended to prevent heat transfer members of a vaporizer icing prevention device from causing heat loss and to prevent damage to the heat transfer members. The purpose is to prevent.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a protective cover having heat insulating properties and elasticity is provided to cover the heat transfer member.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A motorcycle 1 is a vehicle, and a front wheel 4 and a handle 5 are supported at the front end of a body frame 2 via a front fork 3. Further, a rear wheel 8 is supported at the rear of the vehicle body frame 2 via a rear arm 7, and the rear wheel 8 is driven by an engine 9 supported by the vehicle body frame 2. 10 is a fuel tank, and 11 is a seat.

The engine 9 has a crankcase 13 and a cylinder 14 projecting upward from the crankcase 13, and an exhaust pipe 15 is connected to an exhaust boat formed at the front of the cylinder 14. Further, an intake pipe 16 is connected to an intake boat formed at the rear of the cylinder 14, and a carburetor 17 is connected to this intake pipe 16.

The vaporizer 17 is connected to an operating device (not shown) via a wire means 19, and by operating this operating device, the vaporizer 1
The throttle opening degree is adjusted in step 7.

Then, the fuel from the fuel tank 10 is atomized into the intake air by the carburetor 17 to form a mixture, and the intake pipe 16
is drawn into the cylinder 14. This air-fuel mixture burns within the cylinder 14 to drive the engine 9, which becomes exhaust gas and is discharged from the cylinder 14 to the outside through the exhaust pipe 15.

In the above configuration, a heat pipe 20 which is a heat transfer member is interposed between the exhaust pipe 15 which is a vehicle heat generating part and the carburetor 17. One end of this heat pipe 20 is connected to the heat receiving bracket 2
1 to the exhaust pipe 15, and the other end of the heat pipe 20 is connected to the upper part of the vaporizer 17 via a heat radiation bracket 22.

A protective cover 24 is provided on the heat pipe 20 to cover it. This protective cover 24 is made of a rubber pipe material having heat insulating properties and heat resistance.

The heat of the exhaust gas passing through the exhaust pipe 15 is transmitted from the heat receiving bracket 21 to the heat pipe 20, and from this heat pipe 20 to the upper part of the vaporizer 17. Then, the vaporizer 17 is warmed by this heat, and icing of the vaporizer 17 is prevented.

Further, a portion of the protective cover 24 in the circumferential direction is cut in the axial direction to form a slit 25. If this slit 25 is expanded against the elastic force of the protective cover 24, the protective cover 24 can be easily attached to and removed from the heat pipe 20. Further, the slit 25 is formed on the outer peripheral surface of the protective cover 24 at a position facing the cylinder 14 side, so that the slit 25 does not degrade the appearance of the protective cover 24.

(Effects of the Invention) According to the present invention, since a protective cover is provided that has heat insulating properties and elasticity and covers the heat transfer member, this protective cover prevents the wind from traveling, water splashed up by the wheels, etc. from forming the heat transfer member. This prevents it from coming into contact with and cooling it. Therefore,
Heat loss of heat transferred from the vehicle heat generating part to the carburetor is suppressed, and the temperature of the carburetor is maintained at a predetermined temperature.

In addition, the protective cover prevents pebbles and the like from directly colliding with the heat transfer member during the run, thereby preventing damage to the heat transfer member, and the protective cover is effectively utilized and beneficial. .

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a partially enlarged view of FIG. 2, FIG. 2 is a partially omitted side view of the entire motorcycle, and FIG.
The figure is a plan view of FIG. 1, and FIG. 4 is a sectional view taken along the line IV-TV in FIG. 1. Motorcycle (vehicle), 9. Engine, 15.φ
Exhaust pipe (vehicle heat generating part), 17-.Inch device, 20..Heat pipe (heat transfer member), 24..Protective cover.

Claims (1)

[Claims] 1. In a carburetor icing prevention device in which a heat transfer member is interposed between the heat generating part and the vaporizer in a vehicle, a protective cover having heat insulating properties and elasticity and covering the heat transfer member is provided. Characteristic vaporizer icing prevention device.