JPH02525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a cylinder head of a multi-cylinder internal combustion engine for a vehicle, and particularly to the structure of a cooling water passage in the cylinder head.

When installing a multi-cylinder engine in a vehicle, there are two types: vertical installation, in which the engine is placed vertically with the longitudinal direction of the engine facing the longitudinal direction of the vehicle, and horizontal installation, in which the engine is installed with the longitudinal direction facing the width direction of the vehicle. The extraction of cooling water from the cylinder head for conducting the cooling water from the cylinder head to the radiator is different for longitudinally mounted engines and for transversely mounted engines.

In order to clarify the problems with the conventional cooling water extraction structure in the cylinder head, the conventional structure will be explained with reference to the drawings as follows.
That is, FIG. 1 shows a general method for taking out cooling water in the case of a vertically mounted engine. Cooling water is drawn from a water outlet 2 attached to the front end of a cylinder head 1 to a radiator hose 3.
flows into the radiator 4 via the In addition, Figure 2 shows a general method for horizontally mounted engines, but in this case there is usually almost no space at the front end of the engine, so cooling water is poured from the rear of the engine as shown in the figure. is often taken out. That is, cooling water flows from a water outlet 12 attached to the rear end of the cylinder head 11 to a radiator 14 via a radiator hose 13.

Under these circumstances, if you want to use the cylinder head both vertically and horizontally, it is necessary to provide two cooling water installation ports on the same engine in advance, one at the front end and the other at the rear end of the engine. In each case, one can be blind-covered, but in that case, not only will an extra portion be required for each, but the flow of cooling water in cylinder heads 1 and 11 is different, so the cylinder head The temperature distribution of the cooling water inside the cylinder changes, and it becomes necessary to make the water hole shape of the cylinder head gasket different in both cases. This also leads to an increase in the number of unnecessary parts, which is not desirable from the viewpoint of productivity.

In order to solve the above-mentioned problems with the conventional structure, the present invention addresses the cooling water outlet position of the cylinder head, which is a problem when mounting an engine.
The purpose is to provide an optimal structure that is compatible with both vertical and horizontal orientations.

Furthermore, even when a cooling water outlet position selected in accordance with the above objectives is adopted, uneven flow is not caused in the water jacket in the cylinder head, and cooling is prevented due to the occurrence of air pockets. It is also an object to provide a water jacket structure that allows effective cooling of the cylinder head without causing blockage.

The cooling water passage of the cylinder head of the present invention, which is provided in accordance with the above object, locates the cooling water outlet of the cylinder head almost in the center of the cylinder head, and also positions the upper surface of the water jacket in the cylinder head at the engine mounting angle. It is formed by tilting in the opposite direction by the above angle.

Preferred embodiments of the cooling water passage of the cylinder head of the present invention will be described below with reference to the drawings.

FIG. 3 schematically shows a cylinder head of a multi-cylinder vehicle engine. A cooling water outlet 22 is provided on one side of the cylinder head at approximately the center of the cylinder head 21 in the longitudinal direction.

Codes 23a, 23b, 23c, 23d, 23e
indicates a cylinder head mounting boss, through which a mounting bolt is inserted to attach the cylinder head 21.
is fixed to a cylinder block (not shown). The positional relationship between the cooling water outlet 22 and the cylinder head mounting boss 23 is such that the central axis of the cooling water outlet 22 is located near the center of the cylinder head 21, as shown in FIG. As a result, the areas of the cooling water passages 24 and 25 facing the cooling water outlet 22 on both sides of the mounting boss 23c are made to be the same.

A water jacket 26 is formed within the cylinder head 21. When an engine is mounted on a vehicle, it is usually mounted with a slight engine mounting angle β when vertically mounted, and usually with a front upward mounting angle. The upper surface 27 of the water jacket 26 is partially inclined at an angle greater than or equal to the engine mounting angle in a direction opposite to the mounting angle. That is, when the engine is installed in a vehicle vertically and with the front up, as shown in FIG. It is tilted upward at an angle α that is larger than the angle β. In addition, when the engine is installed in a vehicle in a vertical position with the front facing down, as shown in FIG.
The upper surface 27 of the water jacket on the rear side is formed so as to be inclined rearward and downward at an angle α larger than the engine mounting angle β.

In addition, when the engine is mounted horizontally, as shown in FIG. 7, it is mounted horizontally.

Cylinder head 21 configured as described above
can be mounted on a vehicle either vertically or horizontally with the same cylinder head. That is, FIGS. 8 and 9 show the engine installed in a vehicle in a vertical position and with the front facing up. In the figure, 28 is a radiator hose attached to the cooling water outlet 22, 29 is a radiator, and 30 is a suspension device. On the other hand, Figures 10 and 1
Figure 1 shows the case where the engine is mounted horizontally on a vehicle. Cylinder head 21
Although the space between the suspension device 30 and the suspension device 30 is small,
Space is not an issue.

Also, in the case of vertical installation, the engine usually
When the water jacket 26 is mounted on the front upward with a mounting angle β of 5 degrees, the upper surface 27 of the water jacket 26 is α≧β.
Since the cooling water outlet 22 is formed with an angle α of do not have. Moreover, in the case of the front downward movement, on the other hand, since the portion behind the cooling water outlet 22 is formed backward downward, no air pockets are generated in the same way. Therefore, insufficient cooling and local heating of the air pockets due to the formation of air pockets are prevented.

Also, the mounting boss 2 inside the water jacket 26
3. Since the flow path area toward the cooling water outlet 22 on both sides is equal, the flow of cooling water in the front half and the vertical half of the cylinder head 21 is equal to each other, and as a result, the flow of the cooling water in the front half and the rear half of the cylinder head 21 is equal. will be cooled almost evenly.

Therefore, when using the cylinder head cooling water passage according to the present invention, the following various effects can be obtained.

First, the cooling water outlet from the cylinder head is located almost in the center of the cylinder head, making it possible to use the cylinder head in both vertical and horizontal positions. There is no need for special attachments for cooling water extraction or design changes to the water jacket, which would be required when used for both. I can also understand the unreasonableness of providing two locations at different locations.

In addition, by locating the cooling water outlet on one side of the cylinder head, approximately in the center of the cylinder head, and by making the area of the cooling water flow path toward the cooling water outlet on both sides of the cylinder head mounting boss the same, It is possible to cool the rear half and the rear half almost equally, and it is possible to equalize the cooling performance and the cooling water temperature.

Furthermore, the top surface of the water jacket inside the cylinder head is tilted in the opposite direction by an angle greater than the engine mounting angle so that the cooling water outlet is at the highest position on the top surface of the water jacket.
Even when the engine is used in a vertically mounted state, air pockets do not occur, and cooling performance can be reliably prevented from being impaired.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a conventional vehicle with a vertically mounted engine, FIG. 2 is a schematic plan view of a conventional vehicle with a horizontally mounted engine, and FIG. 3 is a cylinder of the present invention. FIG. 4 is a schematic plan view of the cylinder head to which the cooling water passage of the head is applied; FIG. 4 is a partial sectional view of the vicinity of the cooling water outlet of the device shown in FIG. 3, and is a sectional view taken along the - line in FIG. 3; , Fig. 5 is a schematic front view of the cylinder head showing the relationship between the front upward mounting angle of the engine and the upper surface of the water jacket, and Fig. 6 is a schematic front view of the cylinder head when the engine mounting angle is forward downward. 7 is a schematic front view of the cylinder head when the engine is mounted horizontally in a vehicle, FIG. 8 is a schematic plan view of a vehicle in which the engine to which the present invention is applied is mounted vertically, and FIG. The figures are a schematic side view of Fig. 8 and a schematic side view of Fig. 10.
The figure is a schematic plan view of a vehicle horizontally mounted with an engine to which the present invention is applied, and FIG. 11 is a schematic side view of FIG. 10. The meanings of the main symbols in the figure are as follows. 2
1...Cylinder head, 22...Cooling water outlet,
23... Cylinder head installation boss, 24, 25...
...Cooling water flow path, 26...Water jacket, 2
7...Top surface of water jacket, 28...Radiator hose, 29...Radiator, 30...Suspension device.

Claims (1)

[Claims] 1. The cooling water outlet of the cylinder head is located approximately in the center of the cylinder head, and the upper surface of the water jacket in the cylinder head is partially tilted in the opposite direction by an angle equal to or greater than the engine mounting angle. A cooling water passage of a cylinder head, characterized in that it is formed by 2. In the cooling water passage of the cylinder head according to claim 1, the cooling water outlet is located on one side of the cylinder head, approximately at the center of the cylinder. 3. In the cylinder head cooling water passage according to claim 1, the cooling water outlet is located near the cylinder head mounting boss, and the cooling water flow path is directed to the cooling water outlet on both sides of the mounting boss. have the same area. 4. In the cooling water passage of the cylinder head as set forth in claim 1, when the engine is installed in a vehicle vertically and with the front up, the water jacket in front of the cooling water outlet in the cylinder head The top surface is tilted upward at an angle greater than the engine mounting angle. 5 In the cooling water passage of the cylinder head as set forth in claim 1, when the engine is installed in a vehicle vertically and with the front downwards, the water jet is located behind the cooling water outlet in the cylinder head. The top of the butt is tilted backwards and downwards at an angle greater than the engine mounting angle.