JPH027231Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an air bleed device in a cooling waterway system of a water-cooled engine.

Prior Art Conventionally, the cooling channel system of a water-cooled engine is configured as shown in FIG.
The injected cooling water flows to the radiator 31,
It enters the engine 33 through the water pump 32 and then fills the thermostat housing 36. When pouring water into the cooling channel system in this way, smooth water injection cannot be achieved unless the air remaining in the cooling channel is removed. The water channels are blocked and it is difficult for air to escape, making it difficult to fill the cooling channels of the radiator 31 and the like with sufficient water. In order to eliminate this problem, conventionally, an air hole is provided on the seam of the thermostat 34 to provide an escape route for air when cooling water is injected. The structure is shown in FIGS. 4 and 5. In FIG. 4, the thermostat 34 housed in the thermostat housing 36 has a valve portion 34a and a seat portion 34b. During cooling, both contact and block the cooling water passage W, and when the water temperature rises, both of them close together. It dissociates to open the cooling channel. Naturally, when cooling water is injected, the thermostat 34 is in a closed state, and there is no escape route for the air that is pushed up from below the thermostat housing 36 due to the water injection. Therefore, an air bleed device 37 as shown in enlarged form in FIG. 5 is provided on the seat portion 34b of the thermostat. In FIG. 5, a small air hole 37a is passed through the seat portion 34b, and a pendulum valve 37b is inserted into the air hole 37a so as to be movable up and down. This pendulum valve 37b descends due to the weight of the lower weight part to open the air hole 37a, and rises due to water pressure from below to close the air hole 37a. When cooling water is injected, the pendulum valve 37b opens. is held to create an air escape route, and after filling with cooling water, it is closed by water pressure.

Problem: In such a conventional air bleed device, the air hole 37a is small and the air bleed function is insufficient.

When the water injected from the water inlet flows directly into the top surface of the thermostat, the water flows through the air hole 37a.
There were problems such as the air bleed function being lost due to blockage.

Means for Solving the Problems This invention was devised in view of the above-mentioned conventional problems, and in order to solve the above-mentioned problems, the gist of the invention is to install a thermostat housing in the cooling channel of a water-cooled engine. An air bleed bypass circuit that connects the cooling water channel inside the thermostat housing with the outside air by opening the other end near the cooling water inlet and allowing air to bleed when cooling water is poured into the bypass circuit. The structure includes a valve that maintains the bypass circuit in an open state and closes the bypass circuit by the water pressure of the cooling water when the thermostat housing is filled with cooling water.

Function With this configuration, when cooling water is injected from the water inlet, the air existing in the cooling waterway is pushed by the injected cooling water and pushed into the thermostat housing. Inside the Tatsuto housing, there is an air release bypass circuit that is open at one end and communicated with the outside air near the water inlet at the other end, so the pushed out air uses this bypass circuit as an escape route and is released to the outside air. . Further, when the cooling water channel is filled with cooling water, a valve provided in the bypass circuit is closed by water pressure, and leakage of the cooling water is blocked.

Embodiment An embodiment embodying the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes an air venting bypass circuit, one end of which is opened to a cooling water channel W in the thermostat housing 2, and the other end of which is opened to a cooling water channel W near a water inlet 3 in a direction substantially perpendicular to the water inlet 3. There is. Therefore, this air bleed bypass circuit 1 is connected to a cooling water channel W of a water-cooled engine which communicates with the water inlet → radiator → water pump → engine → thermostat housing → thermostat → water inlet as shown in FIG. , the water inlet 3 and the thermostat housing 2 are brought into direct communication, and even when the cooling waterway W is blocked by the thermostat 4, air can be released to the water inlet. The air venting bypass circuit 1 is mainly formed of a flexible hollow tube, one end of which is fitted into a protruding tube 2a formed protruding from the side wall of the thermostat housing 2, and the other end connected to a water inlet. It is fitted into a protruding tube 3a that is integrally formed and protrudes from the side wall of 3 in the right angle direction. In the figure, 5 is a valve, which is a projecting pipe 2 in the thermostat housing 2.
an opening/closing plate 5b which is rotatably attached to the opening S of a in a manner that the opening S can be opened and closed about a fulcrum 5a, and which is formed into an approximately L shape, and a hollow fixed to the lower end of the opening/closing plate 5b It is composed of a float 5c. This valve 5, as shown in FIG.
When the thermostat housing 2 is not filled with cooling water, the float 5c tilts downward about the fulcrum 5a due to its own weight, and the float 5c
comes into contact with the inner wall of the thermostat housing 2 and comes to rest. In this state, the opening S of the protrusion pipe 2a communicates with the inside of the thermostat housing and is in an "open" state. On the other hand, when the thermostat housing is filled with cooling water, the float 5c floats up due to the cooling water, and the upper piece of the opening/closing plate 5b comes into contact with the opening S of the projecting pipe 2a, and the opening S and the inside of the thermostat housing are brought into contact with each other. It is cut off from the air and becomes in a "closed" state.

In this example device configured as above,
When cooling water is injected into the cooling waterway W from the water inlet 3, the cooling water fills the radiator, engine, etc.
Eventually it flows into the thermostat housing.
At this time, the air existing in the cooling water channel W is pushed out into the thermostat housing 2, and has no place to escape because the thermostat 4 is blocking the cooling water channel W. '', the water can escape to the outside from the water inlet 3 via the bypass circuit. As the cooling water channel W is filled with cooling water, the amount of remaining air decreases, the float 5c gradually floats up, and the air bleed bypass circuit becomes "closed". In this state, the cooling water fills inside the thermostat housing 2 and does not flow out to the outside.

Effects According to the present invention, since an air bleeding bypass circuit is provided separately from the cooling water channel W, which communicates the thermostat housing with the outside air, the cross-sectional area of this bypass circuit can be designed to be large at the design stage, and the cooling Even when the water injection speed increases and the flow rate of air to be released increases, or when cooling water flows directly into the upper surface of the thermostat from the water injection port, air can be removed reliably. Furthermore, once air is removed, this bypass circuit is closed by a valve, so no cooling water leaks to the outside, and even during subsequent engine operation, the valve is always closed by water pressure and does not affect engine drivability. be.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Figure 1 is a schematic sectional view of the main parts, Figure 2 is an enlarged cross-sectional view of the main parts of Figure 1, Figure 3 is a cross-sectional view showing the cooling channel system of a water-cooled engine, and Figure 4 is a conventional Figure 5 is a sectional view of the main part showing the air venting structure of
FIG. 2 is an enlarged explanatory diagram of the main part of the figure. 1...Air bleeding bypass circuit, 2...Thermostat housing, 3...Water inlet, 5...Valve, W...Cooling water channel.

Claims (1)

[Scope of utility model registration request] For air bleeding in the cooling waterway W of a water-cooled engine, one end is opened inside the thermostat housing 2 and the other end is opened near the cooling water inlet 3 to communicate the cooling waterway W inside the thermostat housing 2 with outside air. When cooling water is poured into the bypass circuit 1, the bypass circuit 1 is held open to allow air to bleed out, and when the thermostat housing 2 is filled with cooling water, the pressure of the cooling water is used to keep the bypass circuit 1 open. An air bleed device for a cooling channel system of a water-cooled engine, characterized in that it is provided with a valve 5 for closing a bypass circuit 1.