JPS6139104Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vaporizer temperature adjustment device for a vehicle engine, and particularly to an air cleaner that is equipped with an automatic intake air temperature adjustment device and sucks warm air or normal air. This relates to a device that warms the vaporizer body when it is cold and cools it when it is hot.

[Prior art and problems]

Conventionally, in car engine carburetors,
It is known that during high temperatures in the summer, percolation occurs due to fuel evaporation, and during cold winters, an icing phenomenon occurs in which the throttle valve, etc. freezes, but countermeasures for these high temperatures and cold temperatures have not been taken separately. Ta. In other words, as a measure to prevent percolation at high temperatures, for example,
51-68031, which ventilates the engine room housing the engine, JP-A-56-
There is a device, as disclosed in Japanese Patent No. 18053, which utilizes a mechanism for introducing secondary air into the exhaust system in a predetermined operating state to blow air into the carburetor to cool it. In addition, as a measure to prevent icing in cold weather, there is a method of circulating cooling water or exhaust gas through the carburetor body to transfer heat.

Furthermore, there is a Japanese Utility Model Publication No. 18010/1983 that uses cold air and hot air to adjust the temperature of a carburetor, and this is similar to the present invention, but this prior art is for controlling the temperature of fuel in a carburetor at a constant level. Therefore, the structure is such that the cowling around the float chamber is selectively connected to a line that introduces cold air from outside the engine room and a line that introduces warm air heated by the exhaust temperature. Therefore, this method is intended to prevent percolation at high temperatures and to prevent problems when the fuel temperature changes at cold temperatures, but does not directly deal with icing, and is structurally complex.

[Means for solving problems]

In view of these circumstances, the present invention utilizes an air cleaner equipped with an automatic intake air temperature adjustment device that sucks warm air or normal air, and extracts a portion of the air from this air cleaner and blows it onto the carburetor body. The gist of this invention is to prevent both percolation at high temperatures and icing at cold temperatures.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, reference numeral 1 indicates an air cleaner, and an intake air temperature automatic adjustment device 3 is provided at the intake port 2 of the air cleaner 1. A main body 5 of a carburetor 4 is connected to the center of the carburetor 4.
The automatic intake air temperature adjustment device 3 has a control system in the air cleaner inlet 2 that operates a vacuum motor 6 to open the warm air inlet 7 and close the inlet 2, or to close the warm air inlet 7 and open the inlet 2. It has a valve 8, and the warm air inlet 7 communicates through a passage 9 with an air stove 10 that generates warm air on the exhaust pipe side by the temperature of the exhaust gas. Also, a temperature sensor 1 is installed inside the air cleaner 1, and communicates with or shuts off depending on the intake air temperature to open the negative pressure passage 12 to the atmosphere.
1 is provided, and the vacuum motor 6 communicates with the suction pipe 13 via the temperature sensor 11 through a negative pressure passage 12.

In such a configuration, a duct 14 that leads out a part of the air from the downstream side of the warm air intake port 7 of the air cleaner intake port 2 branches, this duct 14 opens close to the carburetor main body 5, and further the opening of the duct 14 branches. A fan 1 driven by a motor 16 is provided in the section 15.
7 is provided. After the battery 18 is electrically connected to the motor 16 via the ignition switch 19, the temperature switch 20, which is attached to the float wall of the carburetor 4 or the like and turns on when the temperature is higher than the set temperature, is connected to the motor 16, and A vacuum switch 21 is provided on the side of the vacuum motor 6 from the temperature sensor 11 of the negative pressure passage 12 and is turned on when the negative pressure is deeper than the set negative pressure. It is connected as follows.

Since the present invention is configured in this way, when the temperature is cold, the temperature sensor 11 brings the negative pressure passage 12 into communication state according to the temperature of the air cleaner intake air.
Suction pipe negative pressure of the suction pipe 13 is supplied to the vacuum motor 6 through the negative pressure passage 12 . Therefore, the control valve 8 operates to close the intake port 2 and open the warm air intake port 7, so that the warm air from the air stove 10 is sucked into the air cleaner 1 and supplied to the vaporizer 4. This prevents the intake temperature of the vaporizer from decreasing, and the fluctuation of harmful exhaust gas components due to outside air temperature is reduced.

On the other hand, at this time, a vacuum switch 21 is provided on the vacuum motor 6 side of the negative pressure passage 12, and since this is turned on when the negative pressure is deeper than the set negative pressure, the motor 16 rotates the fan 17 by being energized. Therefore, a part of the warm air sucked into the air cleaner 1 is blown onto the carburetor body 5 through the duct 14, and the carburetor body 5 is thus warmed and the throttle valve shaft is defrozen.

On the other hand, at room temperature, the intake air temperature is high, so the temperature sensor 11 shuts off the negative pressure passage 12 and opens the vacuum motor side to the atmosphere, and as a result, the vacuum motor 6 becomes atmospheric pressure, and the control valve 8 opens to warm up the vacuum motor 6. Close the suction port 7 and fully open the suction port 2. Therefore, the above-mentioned intake air temperature adjustment effect by sucking in warm air is no longer performed, and normal atmospheric air is sucked in. Since the negative pressure passage 12 is blocked, the vacuum switch 21 is also in a non-operating state. Become. At this time, when the outside air temperature rises or the float wall temperature of the carburetor 4 becomes high after high-speed or high-load operation, the temperature switch 20 is turned on and the motor 16 is energized to rotate the fan 17. Atmospheric air is blown onto the carburetor body 5. In this way, the carburetor 4 is forcedly cooled, and percolation due to fuel evaporation is prevented.

[Effect of idea]

As is clear from the above explanation, according to the present invention, when the temperature is high, air is blown into the vaporizer 4 to cool it, and when it is cold, warm air is similarly blown into the vaporizer 4 to heat it. Since icing can be prevented together, the structure is simplified compared to those in which these measures are taken separately, and the range of use of the vehicle is expanded by equipping with such preventive measures. Since the automatic intake air temperature adjustment device installed in the air cleaner 1 is used, the operation is reliable and the structure is very advantageous.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of the device according to the present invention. 1...Air cleaner, 2...Intake port, 3...Intake air temperature automatic adjustment device, 4...Carburizer, 5...
Main body, 7... Warm air intake, 14... Duct, 15
...Opening, 16...Motor, 17...Fan,
20... Temperature switch, 21... Vacuum switch.

Claims (1)

[Scope of utility model registration request] When the air cleaner inlet is equipped with an automatic intake air temperature adjustment device that sucks air warmed by exhaust heat during cold weather, a duct is branched from the downstream side of the warm air intake of the above-mentioned intake port toward the carburetor body. , and a motor-driven fan is provided at the opening of the duct, and the motor is electrically connected to a switch that detects the temperature of the vaporizer and the operating state of the device. A vaporizer temperature adjustment device characterized in that the device is configured to blow air onto the duct body when driven.