JP2566660Y2 - Water-cooled engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the present invention, in which the temperature of cooling water passing through an intake valve side is rapidly increased when the engine is at a low temperature, such as at the time of starting, so that the temperature near the intake valve is increased, thereby evaporating and burning fuel. Regarding the engine that was improved.

[0002]

In a conventional water-cooled engine, as shown in FIG. 4, the water chamber of the water chamber a ₁ and a cylinder head b of the water pump P and the cylinder block a are in series from the cylinder head b The channel returning to the water pump P is a bypass channel c.
And a water cooling passage d having a radiator d ₁ are arranged in parallel, and both water passages c and d are switched by a bottom bypass type thermostat e. This thermostat e is
When the water temperature of the bypass c is low, the cooling water is supplied to the bypass c.
Then, when the water temperature rises, the bypass c is closed and the water is returned through the water cooling passage d.

[0003] According to this means, the radiator d at a low temperature
_{Although the} water temperature rises faster to bypass ₁ , the engine must pass through the entire engine, so it takes some time to raise the temperature to the required temperature.

In a water-cooled engine with a turbocharger, a cooling water passage of a cylinder head is divided into an intake valve side and an exhaust valve side so that high-temperature and high-energy exhaust gas can be used even at a low speed. The one that closes the cooling water channel passing through the side and accelerates the temperature rise of the cylinder head near the exhaust valve, prevents the exhaust passing through it from cooling, and supplies the exhaust to the turbocharger 60-1
94125, 61-23414, 61-36414
And so on.

However, in the technology according to this disclosure,
Since all of the cooling water flows through the water cooling passage provided with the radiator, the temperature of the cooling water rises slowly, and since this cooling water flows through the intake valve side, the temperature rise on the intake valve side becomes rather slow, and fuel vaporization does not occur. It is sufficient and combustion is likely to be incomplete.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to transfer heat from a combustion chamber of an engine to a cooling water to an intake side of the engine most effectively to promote fuel vaporization and improve a combustion state. As an issue.

[0007]

Means for solving the above problems in the present invention are as follows: a path from a water pump to a water cooling path having a cylinder block, a water chamber of a cylinder head and a radiator, and returning to a water pump; A bypass which is provided to short-circuit a radiator of the water cooling path, and a bypass which closes the bypass and connects an outlet of the water cooling path to an inlet of the water pump when a water temperature of the bypass is higher than a set value. An outlet thermostat, an intake-side water chamber and an exhaust-side water chamber independently provided in parallel with the cylinder head, an outlet of the exhaust-side water chamber communicating with the water cooling path, and an intake-side water. a chamber outlet communicates with the said bypass passage branches communicating an outlet of the exhaust side water chamber to said bypass passage when the water temperature at the outlet of the intake side water chamber is higher than the set value, out the bypass Characterized in that it and a bypass inlet thermostat lower set temperature than the thermostat.

[0008]

In the above means, when the cooling water is at a low temperature, only the cooling water that has exited the intake-side water chamber passes through the bypass inlet thermostat, the bypass passage, and the bypass outlet thermostat, and is taken into the cylinder block water chamber and the cylinder head. The heat flowing through the side water chamber and absorbed by the cylinder water chamber 4 is used for heating the cooling water passing through the intake side water chamber, and the temperature of the cooling water rises rapidly. Then, when the temperature becomes equal to or higher than the set temperature, the cooling water flowing out of the exhaust-side outlet is opened by opening the bypass inlet thermostat, and the cooling water flowing out from the exhaust-side outlet joins the bypass path. Due to the addition of the heat, the temperature of the water entering the suction-side water chamber further rises. Then, when the water temperature rises and becomes equal to or higher than the set temperature of the bypass outlet thermostat, the bypass outlet thermostat is switched so that water of a constant temperature flows through the radiator.

[0009]

An embodiment will be described below with reference to the drawings. 1 (a) and 1 (b), reference numeral 1 denotes an engine main body, 2 denotes a cylinder block, which surrounds four cylinders 3 and is provided with a cylinder water chamber 4 for water cooling. Reference numeral 5 denotes a cylinder head, and a water cooling water chamber 6 provided therein is conceptually divided into an intake water chamber 6i and an exhaust water chamber 6e, each of which is formed in parallel as an independent passage. ing.

The cylinder water chamber 4 is provided at one end with a flow control plate 7 for preventing short-circuit flow. One side of the cylinder water chamber 4 communicates with an inflow passage 9 from a water pump 8. A flow path 10 leading to the intake-side water chamber 6i and a flow path 11 leading to the exhaust-side water chamber 6e are provided in parallel.

The outlet 12 of the suction-side water chamber 6i communicates with a suction passage 16 of the water pump 8 via a bypass outlet thermostat 13, a bypass passage 14, and a bottom bypass type bypass outlet thermostat 15. Both thermostats 13 and 15 are provided with valve portions 13a and 15a and heat sensitive portion 13 respectively.
b, 15b.

The outlet 17 of the exhaust-side water chamber 6e is connected to a water cooling passage 18 having a radiator 18a, and is connected to a valve portion 13a of a bypass inlet thermostat 13. The downstream side of the water cooling passage 18 is connected to a thermostat 15 Valve part 15
a.

When the water temperature is low immediately after the engine is started, the valve portions 13a, 15a of the thermostats 13, 15 are used.
Is closed, and the cooling water pressurized by the water pump 8 flows through the water chamber 4 of the cylinder block 2 as shown by a black arrow 19, and then flows into the intake side water chamber 6i of the cylinder head 5 through the flow path 10. Then, it returns to the pump 8 from the outlet 12 via the heat-sensitive portion 13b of the thermostat 13, the bypass 14, and the heat-sensitive portion 15b of the thermostat 15.

In this process, the cooling water absorbs a large amount of heat from the cylinder 3 in the cylinder block 2 and also absorbs heat in the intake-side water chamber 6i.
Since the circulation is repeated without being cooled by the cooling water, the water temperature rises rapidly and suppresses the temperature near the intake valve from becoming low.

[0015] T _13, T ₁₅ a set value of the thermostat 13 and 15, when the water temperature and Tw, the water temperature Tw in the flow of black arrows 19 in FIG. 1 (a) will rise rapidly to T ₁₃ <Tw. In this state, the thermostat 13 operates to open the valve portion 13a, and the cooling water heated in the high-temperature exhaust-side water chamber 6e flows as indicated by the white arrow 20 in FIG. Merges with the flow indicated by the black arrow 19. At this time, the relationship between the water temperature and the set temperature is T ₁₃ ≦ Tw <
The T _15.

Subsequently, the cooling water heated to a high temperature in the exhaust-side water chamber 6e continues to join, so that the temperature of the cooling water further rises and circulates while diverting into the intake-side water chamber 6i and the exhaust-side water chamber 6e. I do. Therefore, the temperature on the intake valve side is maintained at a high temperature, and the vaporization of fuel in the intake air is promoted.

[0017] Then, the temperature of the water flowing through the bypass passage 14 is Tw> T becomes ₁₅ when the valve portion 15a is opened water cooling passage 18
, And the temperature of the cooling water is kept constant, thereby keeping the combustion state constant.

The flow path 10 in the above embodiment is shown in FIG.
The gasket 22 shown in FIG.
The gasket 22 has an opening 23 corresponding to the cylinder bore.
And a number of small holes 24 communicating the water chamber 4 and the suction-side water chamber 6i.
Are provided, and each small hole 24 corresponds to the flow path 10. Further, a small hole corresponding to the flow path 11 can be provided in the gasket 22.

FIG. 3 is a graph showing a response curve of the water temperature flowing through the cylinder head 6, wherein the horizontal axis represents the intake port water temperature and the vertical axis represents the exhaust port water temperature, and the curves a ₁ , a ₂ .
Is an iso-response line, and the closer to "an", the better the response. In FIG. 3, the curve shows the response in the conventional device of FIG. 4, and the rise in the intake port water temperature and the exhaust port water temperature are in a proportional relationship. However, in the present invention, since the intake port water temperature rises remarkably as shown by the curve, the heating action on the intake air after the engine is started is performed rapidly.

[0020]

As described above, according to the present invention, the cylinder water chamber of the cylinder block and the water chamber on the intake side of the cylinder head are arranged in series at the time of low temperature of the engine, and the cooling water flows by bypassing the radiator. Since only the cooling water heated in the large cooling surface of the cylinder water chamber and the water chamber on the intake side of the cylinder head passes through the intake valve side of the cylinder head, the water temperature rises quickly, and the temperature rise on the intake valve side of the cylinder head increases. early. Thereby, the vaporization of the fuel is promoted, and the combustion state is rapidly improved.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention at a low temperature, and FIG.

FIG. 2 is a plan view of one embodiment of the gasket used in the present invention.

FIG. 3 is an explanatory diagram of the operation.

FIG. 4 is an explanatory view of a conventional technology.

[Explanation of symbols]

2 Cylinder block 4 Cylinder block water chamber 5 Cylinder head 6i Intake-side water chamber 6e Exhaust-side water chamber 10, 11 Flow path 12, 17 Outlet 13, 15 Thermostat 14 Bypass path 18 Water cooling path 18a Radiator

Claims (1)

(57) [Scope of request for utility model registration] 1. A water pump which leaves a water pump (8) and sequentially passes through a water block (6) having a water chamber (6) of a cylinder block (2) and a cylinder head (5) and a radiator (18a). A path returning to (8), a bypass path (14) provided to short-circuit the radiator (18a) of the water cooling path (18), and when the water temperature of the bypass path (14) is higher than a set value, And a bypass outlet thermostat (15) for closing the bypass passage (14) and connecting the outlet of the water cooling passage (18) to the inlet of the water pump (8). An intake-side water chamber (6i) and an exhaust-side water chamber (6e), an outlet (17) of the exhaust-side water chamber (6e) communicating with the water cooling passage (18), and an intake-side water chamber. The outlet (12) of (6i) is connected to the bypass Communicates with the road (14), said intake side water chamber (6i) of the outgoing <br/> opening (12) of the exhaust side water chamber when the water temperature is higher than the set value (6
A water-cooled engine, comprising: a bypass inlet thermostat (13) having a lower set temperature than the bypass outlet thermostat (15) that branches and communicates the outlet (17) of the e) with the bypass passage (14).