JPS6320825Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a cooling system for an internal combustion engine, especially a diesel engine, by blocking the outflow of cooling water in the engine and preventing idling in order to promote engine temperature rise in order to improve combustion performance in the engine. This invention relates to a fresh water cutoff valve for draining cooling water in the engine to prevent the engine from overheating when the engine runs out.

Among internal combustion engines such as diesel engines,
In particular, in direct-injection engines that spray fuel directly into the combustion chamber and whose cylinder diameter is relatively small, the distance between the fuel valve nozzle hole and the fuel chamber wall is small, which shortens the distance that the sprayed fuel travels. ,
If the cooling water temperature is low when starting the engine or when operating in a cold state, the temperature of the combustion chamber will drop and combustion will be extremely incomplete, resulting in a longer warm-up time, an increase in hydrocarbon emissions, and There is a problem in that it causes smoke and white smoke to be generated.

Therefore, in addition to a thermostat that switches the flow path depending on the coolant temperature in the engine's cooling water system, the applicant has previously installed a fresh water cut valve in the cooling water flow path coming out of the water jacket provided in the high temperature part of the engine. A proposal was made to accelerate cooling water temperature rise.

However, in the fresh water cut valve used in such a cooling system, leakage occurs between the valve body and the valve case due to manufacturing errors, etc., but the amount of leakage varies from engine to engine, and the operation of the thermostat Since this has a large effect on temperature, there is a problem in that temperature correction must be performed for each engine when the engine is shipped.

The present invention focused on the problem of the variation in leakage amount that the fresh water cut valve installed in such conventional cooling equipment had, and was made with the intention of correcting and improving the problem. A bottomed cylindrical valve body having a hollow space communicating with a cooling water outlet of the engine is rotatably formed, and a main valve hole communicating between the hollow space and the valve outlet is formed in the valve body, and the valve body is formed so as to be rotatable. In the fresh water cut valve, which opens and closes the cooling water outlet toward the inlet side of the fresh water cooler by rotating the body, the hollow interior of the valve body is configured to communicate with the valve outlet when the valve is in the closed state. However, it is characterized by a structure in which a leak amount adjustment valve is provided in the middle.

Hereinafter, the content of the present invention will be explained based on embodiments shown in the accompanying drawings.

As shown in FIG. 1, a hollow, bottomed, cylindrical valve body 3 is rotatably housed in a valve chamber 2 of a valve case 1, and extends outward from the center of the valve body 3 along its rotation axis. An extended stepped valve operating shaft 4 is inserted into a stepped shaft through hole 6 provided at the center of the valve cover member 5, and its operating end 7 is made to protrude outward from the valve cover member 5. , by rotating the lever 8 fixed to the operating end 7 using a remote control device (not shown),
The valve body 3 is rotated to open and close a passage provided in the valve case 1 from a valve inlet 9 to a valve outlet 10.

The valve body 3 has a main valve hole 11 with a large opening area on its side peripheral surface, and a sub-valve hole 12 with a smaller opening area than the main valve hole 11 at a position out of phase with the main valve hole 11. An auxiliary thermostat 13 that opens and closes a flow path leading to the sub-valve hole 12 depending on the temperature of the cooling water is fixed therein by a fixing ring 14 and bolts 15.

An annular lubricant filling chamber 17 is defined in the opposing gap between the intermediate step 16 provided on the valve operating shaft 4 of the valve body 3 and the intermediate step 16 formed in the shaft through hole 6 of the valve cover member 5. A lubricant such as grease is press-fitted through the filling hole 18 and filled with the filling hole 18 closed by a plug 19, and the valve outlet 10 of the valve case 1 has a fresh water inlet inside. aisle 2
0 and a valve mounting base 2 forming a bypass passage 21
Further, the valve inlet 9 of the valve case 1 is connected via a connecting hose 24 to a cooling water outlet 25 of the engine cylinder head, exhaust manifold, etc.

2, a leak hole 26 is provided in the valve body 3 in correspondence with a leak guide passage 27 that is formed in the valve chamber 2. The guide passage 27 is connected to the valve outlet 10, and a leak amount adjustment valve 28 is provided midway. The valve 28 adjusts the valve stem 29 to the valve chamber 2.
The tip of the valve stem 29 forms a leak amount adjustment orifice 30 in the guide passage 27 by adjusting the screw from the outside. Then, as shown in Fig. 2, when the main valve hole 11 is in a closed state without being rotated toward the valve outlet 10, the leak hole 26 and the leak guide passage 27 coincide with each other to communicate the inside of the valve body 3 with the valve outlet 10, and the leak amount adjustment orifice 30 is adjusted via the valve 28.

The present invention is constructed as described above, and its operation will be explained below.

First, when the engine is stopped and the deceleration operation is being performed, the valve body 3 is in the flow path closed state as shown in FIGS. Water enters the water jacket inside the engine, and instead, engine air escapes from the air vent hole of the auxiliary thermostat 13 to the fresh water cooler 22 side, so the water jacket can be filled with cooling water without operating the valve body 3. be able to.

Furthermore, when the engine is started with the valve body 3 closed, the valve body restricts the outflow of cooling water from the engine, which accelerates the temperature rise inside the engine, shortens the warm-up time, and , if the water temperature in each water jacket of the engine exceeds the valve opening temperature of the auxiliary thermostat 13, the auxiliary thermostat 1
3 opens to release high-temperature water from the sub-valve hole 12 of the valve body 3 to the valve outlet 10, thereby preventing overheating of the engine's high-temperature section.

In addition, when the engine comes out of idling and is in a speed increasing operation state, the valve body 3 rotates and the cooling water outlet flow path 2
5 is in communication, the cooling water that has risen in temperature by taking heat from the high-temperature parts of the engine releases heat to secondary cooling water such as seawater while passing through the tube in the fresh water cooler 22, and goes around the cooling circuit. to prevent engine overheating.

Further, when the valve body 3 is in a closed state, fresh water in the hollow space of the valve body 3 can be discharged to the valve outlet 10 via the leak hole 26 and the leak guide path 27, and the discharge amount is
That is, the amount of leakage is adjusted by changing the orifice 30 of the leak guide path 27 via the valve 28.

As mentioned above, in the present invention, in a fresh water cut valve, the hollow inside of the valve body is formed so that it can communicate with the valve outlet when the valve is in the closed state, and a leakage adjustment valve is provided in the middle, so that changes in fresh water temperature and It is possible to adjust the amount of leakage to suit various engines, and has the advantage of being able to control the fresh water temperature, especially at low speeds.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional explanatory view of a valve part of an internal combustion engine, and FIG. 2 is a sectional view taken along the line A--A of the front side. 1... Valve case, 2... Valve chamber, 3... Valve body, 1
0... Valve outlet, 11... Main valve hole, 22... Fresh water cooler, 25... Cooling water outlet, 28... Leak amount adjustment valve.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical valve body having a hollow space communicating with an engine cooling water outlet is rotatably formed in the valve chamber of the valve case, and a main valve hole communicating between the hollow space and the valve outlet is formed in the valve body. In the fresh water cut valve, which opens and closes the cooling water outlet side to the fresh water cooler inlet side by rotating the valve body, when the valve is in the closed state, the hollow inside of the valve body is opened and closed. A fresh water cut valve for an internal combustion engine cooling device, which is formed so as to be able to communicate with a valve outlet, and is characterized in that a leakage adjustment valve is provided in the middle of the valve outlet.