JPS6039452Y2 - Combustion chamber cooling system for water-cooled engines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water-cooled engine, particularly a combustion chamber cooling device for an engine in which a radiator is provided on the front side of the engine body.

In engines where the radiator is placed at the front of the engine,
A cooling water inlet is formed at the front lower part of the water jacket of the engine body, and a cooling water outlet is formed at the front upper part, and the cooling water inlet and outlet are communicated with the lower tank and upper tank of the radiator, respectively. The peripheral wall of the combustion chamber of the engine is cooled by circulating it between the radiator and the water jacket.

However, in such a conventional engine, when the evangelion is used in a hanging position, steam generated within the water jacket accumulates in the rear upper part of the water jacket, creating a cavity.

Once a cavity is formed, that part cannot be cooled sufficiently, resulting in a superheated atmosphere, which increases the generation of steam and causes the cavity to grow.

As a result, the vicinity of the combustion chamber cannot be sufficiently cooled, resulting in distortion of the cylinder bed and cracks in the area between the valves.

In addition, the high steam pressure inside the water jacket caused cooling water to be squirted out of the radiator cap, posing the risk of causing burns.

The present invention was proposed in view of these points, and includes a pressure relief device installed at the upper rear side of the engine body to release excess steam pressure in the water jacket formed inside the engine body, thereby ensuring that the area near the combustion chamber is It is designed to allow cooling.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The drawing shows a partially cutaway side view of a water-cooled vertical diesel engine. In the drawing, 1 is the engine body, and 2 is a radiator installed on the front side of the engine body 1. This radiator 2 is fixed to the front lower part of the engine body 1. Anti-vibration rubber 4 on support stand 3
Supported through.

A water jacket 6 is formed inside the engine body 1 to surround the combustion chamber 5. This water jacket 6 forms a lower cooling water outflow at the upper front side of the engine body 1, and a lower cooling water inflow into the radiator. 2 lower tank 9
The cooling water outlet 8 is connected to the upper tank 10 of the radiator 2 via water pipes 11, respectively.

The water inlet 12 of the radiator 2 is blocked by a pressure regulating cap 13, and when the steam pressure of the steam generated in the cooling channel becomes higher than the set pressure of the pressure regulating cap 13, the pressure regulating cap 1
3 is activated to release steam.

The present invention is characterized by adopting the following configuration in addition to the above-mentioned basic structure.

That is, the rear side wall 15 of the cylinder head constitutes one side wall of the water jacket 6a formed inside the cylinder head 14.
A steam release pipe insertion hole 16 is provided in the base end 18 of the steam release pipe 17 formed in an L-shape in the steam release pipe insertion hole 16.
The tip opening 19 of the steam discharge pipe 17 is positioned higher than the upper surface of the engine body 1, and the opening 19 is closed with a pressure cap 20.

This pressure cap 20 has a built-in valve plate 22 that comes into pressure contact with a valve seat 21 formed at the tip opening 19 of the steam discharge pipe 17. When raised, it separates from the valve seat 21 and releases the steam in the water jacket 6 to the outside of the water jacket 6.

The set pressure of the pressure cap 20 and the radiator 2
The set pressures of the pressure regulating caps 13 are set to approximately the same pressure.

In the figure, reference numeral 23 is an overflow pipe led out from the tip opening 19 of the steam release pipe 17, and 24 is an O-ring installed between the cylinder head 14 and the flange 25 of the steam release pipe 17.

In this embodiment, the steam release pipe 17 is led out from the rear wall 15 of the cylinder head 14, and the tip opening 19 of the steam release pipe 17 is closed with a pressure cap 20. It is also conceivable to attach the setting valve directly.

As detailed above, the present invention is equipped with an excess pressure release device that releases excess pressure in the water jacket at the rear upper part of the engine body, so even when the engine is used in a forward leaning position, the engine Steam does not accumulate in the water jacket inside the main body.

As a result, the area around the combustion chamber can be reliably cooled, and distortion in the cylinder head and cracks between valves can be effectively prevented.

Furthermore, since the steam pressure within the water jacket does not rise above a certain value, there is no spouting of hot water from the radiator cap, and accidents resulting in burns due to spouting of hot water can be prevented.

[Brief explanation of the drawing]

The drawing is a partially cutaway side view showing an embodiment of the present invention. 1...Engine body, 2...Radiator, 6...Water jacket, 7...
・Cooling water inlet, 8...Cooling water outlet, 9...
...2 lower tank, 10...2 upper tank, 12...cooling water supply port, 13...
・Pressure adjustment cap, 15...6 rear upper wall, 2
0... Excess pressure release device (pressure cap), 17
...Steam release pipe, 19...17 tip opening.

Claims (1)

[Claims for Utility Model Registration] 1. A radiator 2 is located on the front side of an engine body 1,
A cooling water inlet lower and a cooling water outlet 8 opened on the front side of the water jacket 6 formed inside the engine body 1 are communicated with the lower tank 9 and the upper tank 10 of the radiator 2, respectively, so that the cooling water in the upper tank 10 of the radiator 2 is connected to the lower tank 9 and the upper tank 10 of the radiator 2. The supply port 12 is closed with a pressure regulating cap 13, and an excess pressure release device 20 for removing excess vapor pressure at the upper rear side of the water jacket 6 is attached to the rear upper wall 15 of the water jacket 6. Adjust the discharge pressure using the pressure regulating cap 1.
A combustion chamber cooling device for a water-cooled engine, characterized in that the pressure is set to approximately the same as the set pressure of No. 3. 2. Scope of Utility Model Registration Claims In the combustion chamber cooling device for a water-cooled engine described in claim 1, the excess pressure release device 20 is formed by a pressure regulating cap with a pressure setting valve installed therein. 3. In the combustion chamber cooling device for a water-cooled engine described in claim 1 or 2 of the utility model registration claim, the steam discharge pipe 17 is led out from the rear of the cylinder head 14, and the tip opening 19 of the steam discharge pipe 17 is opened. Closed with a pressure cap 20. 4 Utility Model Registration Scope of Claims The combustion chamber cooling device for a water-cooled engine described in claim 1, 2, or 3, in which the excess pressure release device 20 is located higher than the upper surface of the cylinder head.