JPH04203417A - Cooling device of water cooled engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A9 Object of the Invention (1) Industrial Application Field The present invention relates to a water-cooled engine cooling device, and more specifically, the present invention relates to a water-cooled engine cooling device. Related to improvement of the main water pump installed.

(2) In conventional cooling systems, when the engine is stopped at a high temperature, the walk pump is originally driven by the crankshaft in order to prevent local overheating of the engine due to stopping of circulation of cooling water. It is already known that the engine is driven by an electric motor to circulate cooling water between the engine and the radiator until the engine temperature drops to a predetermined value (for example, see Japanese Patent Laid-Open No. 119318/1983). .

(3) Problems to be Solved by the Invention However, even with the above-described method, it is not possible to prevent the engine from overheating due to insufficient circulation of cooling water when the engine is idling at high temperatures or operating at low speeds.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a water-cooled engine cooling system that is capable of sufficiently circulating cooling water in high-temperature conditions to accurately cool the engine regardless of whether the engine is running or stopped. shall be.

B0 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention connects a bypass waterway to a circulation waterway so as to bypass the main water pump,
A feature of the present invention is that an electric auxiliary water pump that operates at least in a predetermined high temperature state of the engine is interposed in the bypass waterway.

(2) Effect According to the above configuration, when the engine is in a predetermined high temperature state, the electric sub-walk pump is operated to circulate cooling water between the radiator and the engine through the bypass waterway that bypasses the main water pump. Therefore, if the amount of cooling water circulated by the main water pump is insufficient due to engine idling or low-speed operation, the amount of cooling water that is circulated by the main water pump will be compensated for, and even if the main water pump is also stopped due to the engine stopping, the cooling water will be needed. A minimum amount of circulation can be obtained.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

First, we will begin with a first embodiment of the present invention shown in FIG. 1
2 indicates a water-cooled engine for a motorcycle, and 2 indicates a radiator.
It is placed in front of the engine 1 so as to receive it directly.

In the engine 1, a main water pump 4 driven by a crankshaft (not shown) is mounted on one side of the crankcase 3.
is installed, and the inlet lower and outlet 8 of a water jacket (not shown) formed inside the cylinder block 5 and cylinder head 6 are opened at one side of the cylinder block 5 and the upper surface of the cylinder head 6, respectively. provided. The suction port 4a of the main water pump 4 and the lower tank 2b of the radiator 2 are connected by the first hose 9I, and the discharge port 4b of the main walk pump 4 and the lower inlet of the walk jacket are connected by the second hose 9□. Further, the outlet 8 and the upper tank 2a of the radiator 2 are connected to each other by a third hose 93. And the first to third hoses9. ~9. A circulation waterway 9 is configured.

The above is a conventional configuration.

In the present invention, an auxiliary water pump 10 is further installed in the crankcase 3 adjacent to the main water pump 4. The auxiliary water pump 10 has a built-in motor for driving it and is electrically configured.

The suction port 10a of the sub water pump 10 is connected to the suction port 4a side of the main water pump 4 via a bypass upstream hose 11+, and the discharge port 10b is connected to the discharge port 4b of the main water pump 4 via a bypass downstream hose Ilb. connected to. Above bypass, downstream hose 111.11□
A bypass waterway 11 is configured.

As shown in FIG. 2, the electric auxiliary water pump lO is connected to a battery 13 via a water temperature sensor 12 that detects the water temperature in the water jacket of the engine 1. The water temperature sensor 12 includes a forward rotation switch 14 for rotating the auxiliary water pump 10 in the normal direction and a reverse rotation switch 15 for rotating the same pump 10 in the reverse direction. The reversing switch 15 closes when the water temperature to be detected falls within a predetermined low temperature range. An auxiliary switch 16 that opens and closes together with a key switch (not shown) of the engine 1 is connected to the reverse energization circuit.

Next, the operation of this embodiment will be explained.

While the engine 1 is operating, the main water pump 4 is constantly driven by its crankshaft. By the operation of the main water pump 4, the water cooled by the radiator 2 is sent to the water jacket of the engine 1 through the first and second hoses 91.9□, as shown by the solid arrow in FIG. After cooling the engine 1, the water is transferred to the third hose 9. It is sent to the radiator 2, where it is cooled and the same circulation is repeated again.

During such operation, when the water temperature in the water jacket of the engine 1 enters a predetermined high temperature range, the normal rotation switch 14 of the water temperature sensor 12 closes and the sub water pump 10 rotates in the normal direction. According to the normal rotation of the sub water pump 10, the water flowing through the first hose 9I is also sent to the second hose 9□ via the bypass waterway 11, thereby increasing the amount of circulating cooling water. Therefore, in this case, even if the circulating amount of cooling water by the main water pump 4 is insufficient due to idling or low-speed operation of the engine 1, the insufficient amount is compensated for by the operation of the auxiliary water pump 10, thereby cooling the engine 1. can be promoted.

Furthermore, even if the engine 1 is stopped in a high temperature range, the sub walk pump 10 will continue to rotate in the normal direction as long as the forward rotation switch 14 is closed, so even if the main water pump 4 is stopped, as shown by the solid arrow, Since the cooling water circulates between the engine 1 and the radiator 2 via the bypass waterway 11, cooling of the engine 1 can be continued.

Next, the engine 1
If the water temperature in the water jacket is within a predetermined low temperature range during operation, both the auxiliary switch 16 and the reverse switch 15 of the water temperature sensor 12 are closed, so the sub water pump 10
is reversed. According to this reversal, as shown by the dotted line arrow in FIG. Stopping the circulation of cooling water between the engine 1 and the radiator 2,
Alternatively, the amount of circulation may be reduced, thereby preventing overcooling of the engine 1.

FIG. 3 shows a second embodiment of the present invention, in which an electric auxiliary water pump 10 is installed in the radiator 2, its suction port is opened to the lower kunk 2b, and its discharge port is circulated through a bypass waterway 11. The structure is the same as that of the previous embodiment except that it is connected to the second hose 9□ of the water channel 9, and in the figure, parts corresponding to those of the previous embodiment are given the same reference numerals.

According to this embodiment, it is possible to achieve the same effects as in the previous embodiment, and the engine 1 is left with the conventional general structure including only the main water pump 4, and the auxiliary water pump is installed. The pump 10 can be installed, and the bypass waterway 11 can be composed of a single hose, which simplifies the structure.

C1 Effects of the Invention As described above, according to the present invention, a bypass waterway is connected to a circulation waterway so as to bypass the main water pump, and an electrically operated auxiliary waterway that operates at least in a predetermined high temperature state of the engine is connected to the bypass waterway so as to bypass the main water pump. Since water and a pump are provided, when the engine is in a predetermined high temperature state, the auxiliary water pump can be operated and the cooling water can be circulated through the bypass waterway regardless of whether the engine is running or not. Therefore, when the engine is idling or operating at low speed, the amount of circulating cooling water can be increased to promote cooling of the engine, and when the engine is stopped, local overheating can be prevented by circulating the cooling water.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention,
FIG. 1 is a side view of a motorcycle engine and its cooling system, FIG. 2 is an electric circuit diagram for driving an electric auxiliary water pump, and FIG. 3 is a diagram showing a second embodiment of the present invention. It is a similar side view. I...Engine, 2...Radiator, 4...Main water pump, 9...Circulation waterway, 10...Sub-water pump, 11...Bypass waterway Figure 2, l Figure 3 Figure 1

Claims (1)

[Claims] A water-cooled system in which a main water pump (4) mechanically driven by the power of the engine (1) is interposed in a circulation waterway (9) connecting the engine (1) and the radiator (2). In the engine cooling system, a bypass waterway (11) is connected to the circulation waterway (9) so as to bypass the main water pump (4), and the bypass waterway (11) is provided with at least a predetermined high temperature state of the engine (1). A water-cooled engine cooling system characterized by being equipped with an electric auxiliary water pump (10) operated by a water-cooled engine.