JPS6129954Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine antifreeze device for an industrial vehicle equipped with a gasoline engine equipped with an air governor, such as a forklift.

It is well known that when a gasoline engine is operated in extremely cold environments such as in extremely cold regions or in freezers, there is a risk of freezing (icing) occurring in the engine's intake system. In the case of an engine equipped with a governor, the fuel flow rate near the governor throttle valve is faster than in other parts, so the freezing phenomenon is more likely to occur in the governor. Unlike the throttle valve of a carburetor, which is opened and closed by a pedal, the governor throttle valve is opened and closed by a balanced force between the negative pressure of the intake system and a spring force, so it is smooth enough to respond to slight operating force. Therefore, if the above-mentioned freezing phenomenon occurs on the sliding surface (rotation fulcrum) of the governor shaft that supports the governor throttle valve, the smoothness of the opening/closing operation will be impaired and the intended Speed control cannot be obtained.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an engine anti-freeze device for industrial vehicles which is capable of solving the above-mentioned problems of the conventional art by introducing preheated air into the governor.

Embodiments of the present invention will be specifically described below with reference to the drawings. In the figure, 1 is an air cleaner, and 2 is an air duct that guides clean air purified by the air cleaner 1 to a carburetor 3. On the downstream side of the carburetor 3, there is an air governor 4 for controlling the engine speed.
The air governor 4 is connected to the intake pipe 5.
It is communicated with the engine main body 6 via. Further, the air duct 2 and the stabilizer piston chamber 7 of the air governor 4 are communicated through a ventilation pipe 8, and a preheating chamber 9 is formed in the ventilation pipe 8 at a position near the stabilizer piston chamber 7. One end of a heat pipe 11 is fixed to a part of the exhaust pipe 10, for example, an exhaust collection part, with a bolt 13 via a clamp 12, and the other end of the heat pipe 11 is inserted into the preheating chamber 9 and held therein. There is. The piston rod 15 of the piston 14, which is slidably fitted into the stabilizer piston chamber 7, is connected to a governor throttle valve 17 mounted on a governor shaft 16. The governor throttle valve 17 is always biased in the opening direction by a governor spring (not shown) mounted on the governor shaft 16, and during operation, the governor throttle valve 17
The opening degree is adjusted via the piston rod 15 according to the engine load by negative pressure acting on the stabilizer piston chamber 7 through the port 18 which is opened on the downstream side of the stabilizer piston chamber.

In the apparatus configured as described above, when the engine is operated, clean air taken in from the air cleaner 1 is introduced into the engine body 6 through the air duct 2, the carburetor 3, the air governor 4, and the intake pipe 5. On the other hand, a part of the air in the air duct 2 is introduced into the stabilizer piston chamber 7 through the ventilation pipe 8 and its preheating chamber 9 by the operation of the air governor 4, but in this case, the exhaust pipe 10 is used as a heat source in the preheating chamber 9. Since the tip of the heat pipe 11 is provided, the air in the preheating chamber 9 is heated by the heat pipe 11. Thus, the heated preheated air flows to the negative pressure side through the gap formed between the sliding surfaces of the stabilizer piston chamber 7 and the piston 14, and flows to the negative pressure side.
8 or the sliding surface of the piston rod 15, thereby preventing the air governor 4 from freezing as much as possible during operation in a low-temperature environment.

Although the present embodiment has been described assuming that there is only one heat pipe 11, it is possible to use a plurality of heat pipes as needed. It is also possible to install the stabilizer piston in the stabilizer piston chamber.

As detailed above, the present invention prevents the air governor from freezing when the engine is operated in a low-temperature environment by introducing preheated air into the air governor. The smooth opening/closing operation of the valve is ensured, ensuring a stable speed regulating function, and the use of a heat pipe as a means to obtain preheated air allows for a simple structure and low cost production. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the antifreeze device of the present invention, and FIG. 2 is a longitudinal sectional view of the air governor. 4...Air governor, 7...Stabilizer piston chamber, 8...Vent pipe, 9...Preheating chamber, 10...
Exhaust pipe, 11... heat pipe.

Claims (1)

[Scope of utility model registration request] An air governor is provided on the downstream side of the carburetor, and a piston connected to the governor throttle valve via a rod is slidably fitted into a stabilizer piston chamber attached to the air governor.
In industrial vehicles in which the negative pressure in the air governor acts on the piston during engine operation through the sliding surface of the piston rod or a port opened in the air governor, one end of the heat pipe is attached to the exhaust pipe, while the other end of the heat pipe is attached to the exhaust pipe. , is attached to either the stabilizer piston chamber of the air governor or the vent pipe that communicates the stabilizer piston chamber and the air cleaner, so that the heat of the exhaust pipe can be transmitted to the stabilizer piston chamber side, and the stabilizer piston chamber and the piston are connected to each other. An engine antifreeze device for an industrial vehicle, which has a gap formed in the sliding surface of the stabilizer piston, and allows preheated air in the stabilizer piston chamber to be introduced into the air governor through the gap by negative pressure generated in the air governor.