JPS587074Y2 - internal combustion engine cylinder head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder head for an internal combustion engine that is equipped with a cooling water jet pipe member that allows a cooling water jet to be accurately introduced into the high temperature part between the valves of the cylinder head.

Conventionally, among accidents involving cylinder heads of internal combustion engines,
One of the serious problems is the so-called crack between the intake and exhaust valves, and one way to prevent this is to reduce the thermal stress, or temperature, in the valve space as much as possible. is important.

Therefore, in order to cool the area around the valve gap, the
As shown in the conventional example in the figure, a cut hole is made in the cylinder head 1, and the side end of the hole is blinded with a plug 3 to allow cooling water to flow through the cylinder head 1.
A system is adopted in which so-called cooling water jet holes 4 are provided to actively guide and cool water to a high temperature area around the valve gap 2 between the exhaust port 5 and intake port 6 of the cylinder head 1.

However, it is necessary to pass the coolant jet hole 4 through the high temperature part around the valve gap 2 of the cylinder head 1, but due to the structure of the cylinder head 1, the head bolt hole 7 and bushing rod hole 8 are in the way. Therefore, it is difficult to properly drill a hole toward the valve gap 2.

That is, as shown in FIG. 1, the jet-shaped cooling water W is
The wall of the intake port 6 partially obstructs its path, resulting in a disadvantage that the cooling effect is not good.

Furthermore, as shown in another conventional example in FIG. Although it is possible to guide the water jet pipe 9 to the desired location, that is, to the valve gap 2, the drawback is that when casting the cooling water jet pipe 9 into the cylinder head 1, it is difficult to ensure the accuracy of positioning the direction of the pipe. There's a problem.

Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present invention provides a cooling water jet pipe member that cools the valve space of the cylinder head, and makes it possible to position the direction of the cooling water jet pipe member. The purpose is to accurately guide the jet to the high temperature area between the valves of the cylinder head and increase the cooling effect.

That is, in the present invention, a cooling water jet pipe member is fitted into a cooling water inlet hole in a water jacket chamber of a cylinder head, and the tip thereof faces a high temperature part between valves of the cylinder head. This is accomplished by screwing a screw member into the cylinder head that fits into a member formed on the member and is positionable in the direction of the tip of the cooling water jet pipe member.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 4 and 5, in which the same parts as in the conventional example shown in FIGS. 1, 2, and 3 are indicated by the same part numbers.

In the embodiment of the present invention shown in FIGS. 4 and 5, the raw end 9a is connected to the cooling water connecting pipe 12 fitted into the cooling water inlet hole 11 in the water jacket chamber 10 of the cylinder head 1 between the valves. A cooling water jet pipe 9 is fixedly bent toward the high temperature part of 2, and a rod member 13 is fixedly installed in the opposite direction, and these cooling water connecting pipe 12, cooling water jet pipe 9, and rod member 13 are integrated. This constitutes a cooling water jet pipe member.

Next, the rod member 13 is fitted into a positioning screw 14 that is screwed into a screw hole provided in the cylinder head 1, and by adjusting the positioning screw 14 from the side surface of the cylinder head 1, The positioning of the tip end 9a of the cooling water jet pipe 9 is ensured.

Note that 15 in FIG. 4 is a fuel injection valve mounting portion.

Therefore, in the cylinder head of the present invention, the direction of the cooling water jet pipe can be reliably positioned.
It is extremely effective in guiding the cooling water jet ejected from the tip to the high temperature part between the valves of the cylinder head for effective cooling.

Also, compared to a cylinder head with conventional drilled cooling water jet holes, the shape of the jet pipe can be selected freely, so the position of the cooling water inlet hole in the cylinder head can be determined by considering the head bolt hole and bushing rod hole. The advantage is that you can decide freely.

The present invention is mainly effective for cylinder heads of water-cooled internal combustion engines.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view of the main part of the cylinder head in a conventional example, Fig. 2 is a side sectional view of the main part of the cooling water jet hole in the I-I direction in Fig. 1, and Fig. 3 is a cooling in another conventional example. FIG. 4 is a side sectional view of the main part of the cylinder head with a water jet pipe; FIG. 4 is a plan sectional view of the main part of the cylinder head in an embodiment of the present invention;
FIG. 5 is a side sectional view of the main part of the cooling water jet pipe member taken along the line 1--2 in FIG. 4. FIG. 1... Cylinder head, 2... Valve space, 9... Cooling water jet pipe, 9a...
...Tip, 10...Water jacket chamber, 11.
... Cooling water artificial hole, 12 ... Cooling water communication pipe, 13 ... Rod member, 14 ... Positioning screw.

Claims (1)

[Scope of utility model registration request] In the cooling water inlet hole in the water jacket chamber of the cylinder head,
The tip fits into a cooling water jet pipe member facing a high temperature part between valves of the cylinder head, and fits into a member formed on the cooling water jet pipe member, and the cooling water jet pipe member A cylinder head for an internal combustion engine, in which a screw member that can be positioned in the direction of the tip of the cylinder is screwed onto the cylinder head.