JPH01125516A - Automotive engine water cooling device - Google Patents

Abstract

PURPOSE:To enhance safety, in a device which has a cooling water passage including a car-room heater passage which bypasses the cooling water circuit leading to a radiator, by providing a release valve which opens when an unexpected high pressure is applied to the cooling water passage. CONSTITUTION:The cooling water passage of a V-type six cylinder engine comprises an outward passage which directly connects the return port 1c of the water jacket 1b of each cylinder row 1a with a cooling water pump 4, and a return passage consisting of a main circulation passage C and a main return passage c. In the main circulation passage C, a thermostat valve 2 and a radiator 3 are provided, and the main return passage c is provided so as to be branched from the thermostat valve 2 and to bypass the radiator 3. And between the cylinder row 1a on one side and the main return passage c, a car-room heater circuit 5 provided with a heater core 5a is connected. Further, a release valve 7 is provided so as to be interlockedly connected with the thermostat valve 2, so that it is opened when an unexpected high pressure is applied to the cooling water passage, enabling the water quantity passing through a regulating throttle 8 to be increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an automobile engine water cooling system.
In particular, the present invention relates to a device that can supply a sufficient amount of hot water that cools the engine to the heater core for heating the passenger compartment even when the engine is operating at low speed.

[Conventional technology]

Conventionally, in an engine water cooling system, the engine's cooling water jacket is connected to the radiator via a cooling water pump and a thermostatic valve, and this thermostatic valve closes when the engine is cold and opens only when the engine is hot, allowing water to flow through the radiator. is configured to do so. Furthermore, the cooling water jacket is provided with a bypass waterway that bypasses the thermostat valve and the radiator, and a heater core for heating the passenger compartment is interposed in this waterway, so that when the thermostat valve is closed, the cooling water is It is configured to circulate through a bypass waterway.

Furthermore, in recent years, as engines have become faster, bypass water channels have been developed to prevent the water pressure in the bypass waterways from rising excessively when the engine is operated at high speeds when the engine is cold, that is, with the thermostat valve closed. A second bypass waterway is further provided in parallel (for example, Japanese Utility Model Publication No. 52-37730).

[Problem that the invention seeks to solve]

However, in such a system, when the engine is operated at low speed, a large portion of the cooling water flows back through the second bypass waterway, so the bypass waterway has increased flow resistance due to the heater core for heating a single room. The amount of water is reduced, and the water channels necessary for heating a single room cannot be obtained. If the water flow resistance of the second bypass waterway is increased to increase this, the water pressure in the waterway will rise excessively when the machine is operated at high speed in a cold state, and the hose may become disconnected from the equipment or the hose may burst. This may cause problems.

[Means for solving problems]

The purpose of this invention is to eliminate such problems and provide a device that allows high-speed operation in a cold state and maintains the amount of water in a bypass waterway that has a heater core for heating the passenger compartment. A cooling waterway is provided that connects the water jacket and the radiator in the outward and return directions, a water pump and a thermostatic valve are interposed in the cooling waterway, and a vehicle interior heater passageway is provided that bypasses the circuit to the radiator. The cooling water pipe is characterized in that it is provided with a release valve that opens when a higher pressure than expected acts on the cooling water channel.

[For production]

When the engine is operated in a cold state, even though the thermostat valve is closed, a portion of the cooling water in the water jacket circulates through the cabin heater passage having the heater core for heating the cabin. At that time, even if the engine operating speed is high, the release valve provided with the high pressure aK of the cooling waterway opens and a part of the cooling water flow bypasses the adjustment throttle and is discharged to the intake side of the cooling water pump. An excessive increase in pressure inside the water channel is avoided.

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiment. FIG. 1 conceptually shows a V-type six-cylinder engine, and the engine has two cylinder rows 1a, 1 m, each cylinder row 1 m long.
, 1m are provided with water jackets 1b, 1b, respectively. 1C is a return port for the cooling water of these water jackets 1b11b, and 1d is an outlet to the cooling water channel. The cooling water channel that runs from the outlet 1d of the water jacket 1b to the return port 1c includes a cooling water return cap 1c and a cooling water pump 4.
an outgoing path of cooling water that directly connects the main circulation path C and the main return path C.
It consists of a return trip consisting of The return path consists of a main circulation path C having a thermostatic valve 2 and a radiator 3, and a main return path C attached to this main circulation path C, which branches off from the thermostatic valve 2 and bypasses the radiator 3. 5
6 is a vehicle interior heater circuit arranged between one cylinder row 1 & and the main return path C, in which a heater core 51 for heating a single room is provided, 6 is the other cylinder row 1a
This is an oil cooler attached to the engine for cooling engine lubricating oil.

As shown in FIGS. 3 and 4, the thermostatic valve 2 has a bullet-type thermostat supported by a central shaft 2& on a valve box 1e supported by an engine box such as a cylinder block or cylinder head. In the casing 2b of the thermostat, a main valve 2c for opening and closing the main circulation path C and a sub-valve 2d for opening and closing the main return path C are known valves. It is formed so that it opens when is applied.

As shown in FIG. 3, the release valve 7 is provided at the lower end of the first valve shaft 2e, and is connected to the main return path C between the valve body 2j which is urged upward by the spring 2f and whose upper moving end is regulated by the upper stopper 2h. It is formed between the adjustment throttle 8 provided at the inlet, and when the engine is in a cold state as shown in the figure, as the casing 2b moves upward, the main valve 2c closes and the sub valve 2 closes.
It is located in the position of the adjustment throttle 8 in conjunction with the opening of the valve d, and reduces the opening degree of the adjustment throttle 8C. The opening degree of the adjustment throttle 8 is set to a required cross-sectional area that will not cause the pressure upstream of the main valve 2c to increase excessively when the engine is operated at full speed in a cold state with the main valve 2c closed. It is.

Incidentally, the structure of the open valve 7 and the method of attaching it to the thermostat are not limited to these. That is, as shown in FIG. 4, the through hole 2k provided in the main valve 2C is closed by the valve body 2j urged downward by the spring 2f, and the pressure in the through hole 2 reaches the expected high pressure. The valve may be configured to open when the valve is opened.

Furthermore, when installing open 9P7, the position is also thermostatic valve 2.
Of course, it is not limited to this, but it is also possible to diagrammatically illustrate Fig. 1 and use temporary lines in Fig. 2 to provide the locations (, ), (b), and (c). . Although this explanation is based on the assumption that the cooling medium is water, the concept includes ethylene glycol and other coolants.

Next, the operation of this embodiment will be explained. When the engine is cold started, in this state the main valve 2 of thermostat 9P2
C closes, and the sub-valve 2d opens, and at the same time, the release valve T opens the adjustment throttle valve 8.
Move near the hole. Therefore, the cooling water is radiator 3
The cooling water is prevented from flowing to the cooling water pump 4 through the adjustment throttle υB and the main return path C, and is returned to the cooling water return port 1C without being cooled. In this way, the temperature of the cooling water is rapidly raised, and the flow rate to the main return path C is regulated from flowing excessively by the gap between the adjustment throttle 8 and the release valve 7. The amount of water can be supplied.

When the engine is brought to full speed in this cold state, the cooling water pump 4 that is linked to this also becomes high speed, and the cooling water channel is pressurized to a high pressure. However, as a result, the differential pressure between the front and back sides of the open valve T increases, and the open valve ff7 compresses the spring 2f and
The water escapes to the downstream side of the adjustment throttle 8, increases the opening of the adjustment throttle υ8, and increases the amount of water passing therethrough, thereby reducing the pressure in the cooling water channel and avoiding an excessive increase in water pressure.

When the engine warms up, the thermostat casing 2b moves downward accordingly, opens the main valve 2C and closes the auxiliary valve 2d, and stops water flow to the adjustment throttle 8, opening the valve. Valve T ceases to function.

〔Effect of the invention〕

As described above, the present invention provides a cooling water circuit that connects the water jacket of the engine and the radiator on the outward and return paths, and includes a water pump and a thermostatic valve interposed in the cooling water circuit, and a circuit to the radiator. In a vehicle equipped with a passenger compartment heater passage that bypasses water, the cooling water circuit is provided with a release valve that opens at a higher pressure than expected, so even if the engine is operated at high speed with the thermostat valve closed, excessive water pressure will not be generated in the cooling water channel. produces an effect that would not otherwise occur.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a piping diagram showing a cooling waterway, Figure 2 is a waterway diagram diagrammatically expressing it, and Figure 3 is a thermostatic valve to which this invention is applied. FIG. 4 is a side view corresponding to FIG. 3 showing another embodiment. 2・Fist・Q thermostat valve, 2Q@11114 main valve,
2d...Sub-valve, C...Main circulation path, C...
Main return path, 5... Vehicle interior heater circuit, T... Release valve, 8... Adjustment throttle. Patent applicant Yamaha Motor Co., Ltd.

Claims (2)

[Claims] (1) A cooling waterway is provided that connects the water jacket of the engine and the radiator on the outward and return journeys, a water pump and a thermostat valve are interposed in the cooling waterway, and a vehicle interior heater is provided that bypasses the circuit to the radiator. An engine water cooling system for an automobile, which is provided with a passage and is provided with a release valve that opens when higher pressure than expected acts on the cooling waterway. (2) The engine water cooling system for an automobile according to claim 1, wherein the thermostat valve is provided upstream of an adjustment throttle provided in the return waterway, and the release valve is attached to the thermostat.