JPH0540268Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a structure of a cooling water outlet for an engine.

(Prior art) Generally, in an automobile engine, a temperature-sensitive valve is installed in a passage connecting a cooling water passage formed in the cylinder head of the engine and a radiator, and when the cooling water temperature is higher than a predetermined temperature, When the valve opens, cooling water flows from the cooling water passage on the engine side to the radiator side, and when the water temperature is lower than a predetermined temperature, the temperature-sensitive valve closes to prevent the cooling water from flowing to the radiator side. The flow of water is controlled according to the water temperature.

On the other hand, in automobile engines, it is common practice to extract a portion of the cooling water to the heater for heating the vehicle interior and use this as a heat source for heating. From the viewpoint of (immediate effect), the engine cooling water passage is formed as far as possible toward the exhaust port side, which is particularly high temperature within the engine, and the temperature-sensitive valve is located at the outlet end of the cooling water passage. It is customary to provide a cooling water outlet from a nearby position to the heater side.

However, when the cooling water passage formed in the cylinder head is biased toward the exhaust port side, and a temperature-sensitive valve and a cooling water outlet to the heater are formed at the end on the outlet side, In this case, if the opening/closing control of the temperature-sensitive valve based on the water temperature is not performed properly, the cooling water may rise excessively as described later.

In other words, if the cooling water passage provided in the cylinder head is biased towards the exhaust port side,
The ability to obtain high-temperature cooling water as a whole is advantageous in terms of heating performance of a heater that uses this cooling water as a heat source, but on the other hand, it is less effective than when the cooling water passage is formed in the center of the cylinder head. Therefore, the cooling effect of the cooling water due to intake air decreases, and the temperature raising effect of the cooling water due to exhaust heat increases, so the cooling water flowing closer to the exhaust port in the cooling water passage and the cooling water flowing closer to the intake port There is a large temperature difference between Furthermore, the flow direction at the outlet end of this cooling water passage changes depending on the operating state of the temperature-sensitive valve, and when the temperature-sensing valve is open and the cooling water is also flowing to the radiator side (i.e., the engine When the temperature is high (when the temperature is high), the flow of cooling water is split to both the temperature-sensing valve side and the heater outlet side, but when the temperature-sensing valve is closed (i.e., when the engine is low temperature), the flow of cooling water is directed toward the heater outlet side. becomes the mainstream.

Therefore, from the perspective of ensuring engine reliability, regardless of the flow state of the cooling water, which changes depending on the opening/closing state of the temperature-sensitive valve, high-temperature cooling water always flows near the exhaust port. It is necessary to actively flow water toward the temperature-sensitive valve, and if this is not possible (i.e., low-temperature cooling water flowing toward the intake port, or high-temperature cooling water flowing toward the exhaust port and low-temperature cooling water flowing toward the intake port). When mixed cooling water flows to the temperature-sensitive valve side), even though the cooling water in the high-temperature area is at a temperature higher than the allowable temperature for engine reliability, it still flows to the radiator side. It is conceivable that the cooling water reflux continues to be blocked, leading to an excessive rise in the cooling water temperature.

However, in the past, no effective countermeasures have been taken against such problems, and from this point of view, there is room for improvement in terms of engine reliability.

(Purpose of the invention) The present invention is an attempt to solve the problems pointed out in the above-mentioned section of the prior art. In an engine that uses water as a heat source for the heater, it is possible to maintain the output performance of the engine by preventing the cooling water from loosening the intake air too much, and to prevent the temperature of the cooling water in the cylinder head from increasing abnormally. The purpose of this project is to propose a structure for an engine cooling water outlet that provides a high level of heating performance.

(Means for Achieving the Object) In the present invention, as a means for achieving the above object, the cooling water passage extending in the cylinder arrangement direction is mainly formed in the cylinder head toward the exhaust port forming side. A cooling water extraction chamber communicating with the cooling water passage is formed at one end of the cooling water passage, and a radiator-side cooling water extraction chamber equipped with a temperature-sensitive valve is provided at a position closer to the exhaust port in the cooling water extraction chamber. A heater-side cooling water outlet is provided at a position closer to the intake port, and the cooling water flowing into the cooling water outlet from the exhaust port side of the cooling water passage is connected to the temperature-sensitive valve in the cooling water outlet chamber. The ribs are formed to deflect the heat toward the temperature-sensing part.

(Function) In the present invention, the following effects can be obtained by the above-mentioned means.

(1) Since the cooling water passage formed inside the cylinder head is biased toward the exhaust port side, the flow of water inside the intake port is more difficult than when the cooling water passage is actively formed on the intake port side. The rate at which the intake port is heated by the high-temperature cooling water flowing through the cooling water passage is small, and the intake air temperature is maintained at a low temperature accordingly, achieving a high level of intake air filling efficiency.

(2) The cooling water passage is formed to be biased toward the exhaust port side, and the heater side cooling water extraction part is located closer to the intake port of the cooling water extraction chamber formed at one end, and the temperature-sensitive valve is located closer to the exhaust port. The temperature-sensitive valve opens and the cooling water is divided into both the heater side outlet and the radiator side. Even if the cooling water actively flows to the heater side outlet, the overall temperature of the cooling water itself is high, so a good heating effect can be expected; When the flowing high-temperature cooling water bypasses the vicinity of the radiator-side outlet and flows intensively toward the heater-side outlet, the high-temperature cooling water that detours and flows into the heater-side outlet causes low-temperature cooling to flow near the intake port. Since the inflow of water is suppressed and high-temperature cooling water is actively introduced into the heater-side outlet, a good heating effect can be expected.

(3) A heater-side cooling water extraction section is formed near the intake port of the cooling water extraction chamber, and a radiator-side cooling water extraction section equipped with a temperature-sensitive valve is formed near the exhaust port. Since a rib is provided to deflect the cooling water flowing from the exhaust port side to the cooling water extraction chamber side toward the temperature sensing part of the temperature sensing valve, the temperature sensing valve opens and the cooling water flows through the opening. When the flow is divided into the valve side and the heater side outlet side, the high temperature cooling water flowing through the exhaust port side flows into the temperature sensing valve side located near the exhaust port, and the temperature sensing valve closes to cool the water. When the main flow of water bypasses the vicinity of the radiator-side outlet and heads toward the heater-side outlet, the bypassing high-temperature cooling water near the exhaust port is actively deflected toward the temperature-sensing valve by the ribs. As a synergistic effect of the flow toward the heater-side outlet suppressing the movement of low-temperature cooling water near the intake port toward the temperature-sensing valve side, high-temperature cooling water flows into the temperature-sensing valve side, resulting in In addition, regardless of whether the temperature-sensitive valve is open or closed, high-temperature cooling water actively flows into the temperature-sensitive valve, and the temperature-sensitive valve always operates based on the temperature of this high-temperature cooling water. .

(Effects of the invention) Therefore, according to the engine cooling water outlet structure of the invention, the following effects can be obtained.

(a) By forming the cooling water passage biased towards the exhaust port side, the effect of raising the intake air temperature due to the cooling water is suppressed and the intake air filling efficiency is increased, which improves engine output performance. This will lead to improvements in

(b) When the cooling water temperature is relatively high and the temperature-sensing valve is open, the cooling water flowing near the intake port flows to the heater-side cooling water outlet, and when the cooling water temperature is relatively low and the temperature-sensing valve is closed. In this state, the highest temperature cooling water flowing near the exhaust port flows into the heater side cooling water outlet, so high temperature cooling water is constantly supplied to the heater side, improving heating performance accordingly. .

(c) High-temperature cooling water is always supplied to the temperature-sensitive valve installed in the cooling water outlet on the radiator side, regardless of whether the temperature-sensing valve is open or closed, with the aid of the deflection effect of the ribs. Since the valve operates based on this high-temperature cooling water, the occurrence of a situation in which the cooling water rises excessively as in the case where the temperature-sensitive valve operates based on low-temperature cooling water, for example, can be prevented in advance. , the reliability of the engine is improved accordingly.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2 show a part of a cylinder head 1 (two-cylinder part on the rear end side of the engine) of an automobile engine equipped with a cooling water outlet structure according to an embodiment of the present invention. This cylinder head 1 is
This is applied to a four-valve multi-cylinder engine that has two intake and exhaust valves per cylinder, and two intake valves are installed at positions corresponding to the combustion chambers 10, 10, etc. of each cylinder. Boss parts 16, 16, two exhaust valve mounting boss parts 15, 15, and one spark plug mounting part 17 are formed. A cooling water passage 4 is formed inside the cylinder head 1 and extends in the direction in which the cylinders are arranged. By applying the present invention, the planar arrangement of the cooling water passage 4 in the cylinder head 1 is mainly biased toward the exhaust manifold mounting surface 2 side (that is, the exhaust port formation side) as shown in FIG. It is said to be placed. Note that it is not the case that no cooling water passage 4 is formed on the side of the intake manifold mounting surface 3, but rather that a cooling water passage 4 is formed slightly below the intake port (not shown). Further, in FIG. 1, reference numeral 18 is a rocker shaft mounting base.

The cylinder head 1 is provided with a cooling water inlet (not shown) at the front end of the engine (not shown) for introducing cooling water into the cooling water passage 4 from the cylinder block (not shown) side. By applying the present invention, a cooling water extraction chamber 5 communicating with the rear end of the cooling water passage 4 is integrally formed in the rear end portion 1a of the engine. Therefore, the cooling water that has flowed into the cooling water passage 4 of the cylinder head 1 from the cylinder block side flows through the cooling water passage 4 from its front end toward the cooling water extraction chamber 5 at its rear end. .

Furthermore, this cooling water extraction chamber 5 is formed with a large diameter radiator side cooling water extraction part 51, a small diameter heater side cooling water extraction part 52, and a bypass port (not shown). The planar arrangement of the radiator-side cooling water extraction part 51 and the heater-side cooling water extraction part 52 in the cooling water extraction chamber 5 is such that the radiator-side cooling water extraction part 51 is located on the exhaust port side ( In other words, on the exhaust manifold mounting surface 2 side),
The heater-side cooling water extraction portion 52 is installed so as to be located on the intake port side (that is, on the intake manifold mounting surface 3 side).

Furthermore, of the radiator-side cooling water extraction section 51 and the heater-side cooling water extraction section 52, the radiator-side cooling water extraction section 51 has a radiator connection pipe 8 whose one end communicates with a radiator (not shown), and a radiator connection pipe 8 that communicates with a radiator (not shown) at one end. Each of the side cooling water outlet portions 52 is provided with a heater connection pipe 9 whose one end communicates with a heater core (not shown) for heating the vehicle interior. Further, a wax type temperature sensing portion 7 is provided at the joint portion of the radiator side cooling water outlet portion 51 with the radiator connecting pipe 8.
A temperature-sensitive valve 6 is installed.

Furthermore, in this example, by applying the present invention,
A pair of upper and lower ribs 12 and 13 are formed on the upper and lower surfaces of the cooling water extraction chamber 5, respectively, and extend in the cylinder arrangement direction and project into the cooling water extraction chamber 5. Due to the guiding action, the cooling water flowing into the cooling water outlet chamber 5 side through the exhaust port side of the cooling water passage 4 is actively deflected toward the temperature sensing portion 7 side of the temperature sensing valve 6. Particularly in this embodiment, by fitting one end of the upper rib 12 and the lower rib 13 into the fitting grooves 21 and 22 formed on the outer periphery of the temperature-sensitive valve 6, the cooling water outlet chamber 5 is closed. The temperature-sensitive valve 6 can be mounted with the temperature-sensitive valve 6 positioned at a predetermined rotational position (that is, the upper rib 12 and the lower rib 1
3 functions as the attachment prevention member of the temperature-sensitive valve 6).

The flow state of the cooling water in the case of this configuration, the heating performance related thereto, and the flow path control of the cooling water by the temperature-sensitive valve 6 will be explained. First, when the cooling water temperature is below a predetermined temperature, the temperature-sensitive valve 6 is closed, so that most of the cooling water flowing from the cooling water passage 4 to the cooling water extraction chamber 5 side is drained from the cooling water extraction chamber 5. The water does not flow into the radiator side, but instead flows directly from the bypass port (not shown) to the cooling water passage side of the cylinder block, and
A portion of the water directly bypasses the vicinity of the temperature-sensitive valve 6 and flows toward the heater-side cooling water outlet 52. In this case, focusing on the flow of cooling water between the radiator-side cooling water extraction section 51 and the heater-side cooling water extraction section 52, the cooling water flowing from the cooling water passage 4 to the cooling water extraction chamber 5 is A flow flows toward the exhaust port side, passes in front of the temperature-sensitive valve 6, and heads toward the heater side cooling water outlet portion 52, and a flow flows toward the intake port side, directly toward the heater side cooling water outlet portion 52 side. It becomes.

In this case, since the cooling water passage 4 is formed to be biased toward the exhaust port side, the flow rate of cooling water flowing toward the exhaust port side is larger than the flow rate of cooling water flowing toward the intake port side, and therefore, the flow rate of the cooling water flowing toward the exhaust port side is larger than the flow rate of cooling water flowing toward the intake port side. The flow toward the side cooling water outlet 52 becomes the mainstream, and the flow of cooling water near the intake port into the heater side coolant outlet 52 is suppressed, and as a result, high temperature cooling is not carried into the heater side coolant outlet 52. Water is actively introduced, and high heating performance is ensured even when the engine is cold, when the temperature of the cooling water itself is relatively low.

In addition, in this case, since the cooling water flowing near the exhaust port passes through the front position of the temperature-sensitive valve 6 and flows toward the heater-side cooling water outlet 52, unless some measure is taken, the temperature-sensing valve 6 The area near the area becomes a pool of cooling water, but in this embodiment, the ribs 12 and 13 are formed in this area by applying the present invention, so that the water flows toward the heater side cooling water outlet 52. A portion of the cooling water is deflected toward the temperature-sensitive valve 6 by the ribs 12 and 13, and as a result, the temperature-sensing valve 6 operates based on the temperature of the high-temperature cooling water flowing near the exhaust port. That will happen.

On the other hand, when the cooling water temperature is higher than the predetermined temperature, the temperature-sensitive valve 6 opens, so the cooling water passage 4
The cooling water that flows from the heater side cooling water outlet part 52 to the cooling water outlet chamber 5 side is the heater side coolant outlet part 52 and the radiator side coolant outlet part 5.
1. The flow will be divided into both. In this case, the radiator side cooling water take-out part 51 is located closer to the exhaust port,
Since the heater-side cooling water extraction portions 52 are formed closer to the intake ports, out of the cooling water,
The high-temperature cooling water flowing near the exhaust port actively flows toward the radiator-side cooling water outlet 51, and the low-temperature cooling water flowing toward the intake port actively flows toward the heater-side cooling water outlet 52.

However, in this operating state, the coolant temperature itself is higher than when the engine is cold, so even if the coolant flowing closer to the intake port is introduced to the heater side coolant outlet 52 side, , high heating performance is ensured.
Furthermore, since high-temperature cooling water flowing near the exhaust port is actively introduced to the temperature-sensitive valve 6 side, the temperature-sensing valve 6 is operated based on this high-temperature cooling water.

In this way, in this embodiment, high temperature cooling water is always introduced into the heater-side cooling water outlet 52 regardless of the engine temperature, thereby ensuring high heating performance. Furthermore, regarding the operation of the temperature-sensitive valve 6, since the temperature-sensitive valve 6 can be operated based on high-temperature cooling water at all times, for example, when the auxiliary temperature-sensitive valve 6 is operated based on low-temperature cooling water, This prevents the cooling water temperature from rising excessively and ensures high engine reliability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a cylinder head of an engine equipped with a cooling water outlet structure according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of a main part of FIG. 1. 1...Cylinder head, 2...Exhaust manifold mounting surface, 3...Intake manifold mounting surface, 4...
... Cooling water passage, 5 ... Cooling water extraction chamber, 6 ... Temperature sensing valve, 7 ... Temperature sensing part, 8 ... Radiator connection pipe, 9
...Heater connection pipe, 10...Combustion chamber, 12...Upper rib, 13...Lower rib, 51...Radiator side cooling water outlet, 52...Heater side cooling water outlet.

Claims (1)

[Scope of utility model registration request] Inside the cylinder head, a cooling water passage extending in the cylinder arrangement direction is formed mainly toward the exhaust port formation side, while a cooling water extraction chamber communicating with the cooling water passage is formed at one end of the cooling water passage. In addition, a radiator-side cooling water outlet equipped with a temperature-sensitive valve is located near the exhaust port in the cooling water outlet chamber.
In addition, a heater side cooling water outlet is provided at a position closer to the intake port, and the cooling water outlet chamber is provided with cooling water flowing into the cooling water outlet chamber from a position on the exhaust port side of the cooling water passage. An engine cooling water outlet structure, characterized in that a rib is formed to deflect the temperature toward the temperature sensing part of the temperature sensing valve.