JPS582414A - Cooling water passage of cylinder head - Google Patents

Abstract

PURPOSE:To enable either longitudinal or lateral disposition of an engine by positioning a cooling water outlet of a cylinder head in the middle thereof an partially inclining the upper face of said cylinder head jacket by the engine mounting angle or more in the reverse direction to said angle. CONSTITUTION:A cooling water outlet 22 for discharging cooling water fed from a water jacket 26 is disposed in the middle of a cylinder head. The upper face 27 of the water jacket 26 is partially inclined by the engine mounting angle beta or more angle gamma at in the reverse direction to said angle. The upper face around the cooling water outlet 22 is located at the highest in comparison with the other upper face regardless of the engine mounting, either longitudinal or lateral, on account of which there will be no formation of bubble on the upper face.

Description

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

When mounting a multi-cylinder engine across a vehicle, there are two methods: vertical installation, with the longitudinal direction of the engine facing the longitudinal direction of the wheels, and horizontal installation, with the longitudinal direction of the engine facing toward the inside of the vehicle.

The extraction of cooling water from the cylinder head to guide the cooling water to the cylinder head or the larciator differs depending on whether the engine is vertically mounted or the engine is horizontally mounted.

In order to clarify the problem of the cooling water extraction structure in the conventional cylinder head, the conventional structure will be explained with reference to the drawings. That is, FIG. 1 shows a general method for taking out cooling water in the case of a vertically mounted engine. Cooling water is taken out from a water outlet 2 attached to the front end of a cylinder head 1 via a radiator hose 3. Fig. 2 shows a general method for horizontally mounted engines, but in this case there is usually little space at the front end of the engine, and as shown in the figure, there is little space at the front end of the engine. In many cases, the cooling water is taken out from the rear side; that is, the cooling water is taken out from the cylinder head 11.
It flows from a quarter outlet 12 attached to the rear end to a radiator 14 via a radiator hose 13.

Under such circumstances, if you want to use the same engine when the cylinder head is installed vertically and horizontally, install two cooling water outlets on the same engine, one at the front end and one at the rear end of the engine.
In each case, one can be blind-covered on one side, but in that case, not only will extra parts be needed for each, but also the way the cooling water flows in the cylinder heads 1 and 11 will be changed. Because of the difference in the cooling water temperature distribution within the cylinder head, it becomes necessary to make the water hole shape of the cylinder rad 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 provides an optimal structure that can be used both vertically and horizontally for the cooling water outlet position of the cylinder head, which is a problem when mounting one engine. The purpose is to

Furthermore, even when the cooling water outlet position selected for the above objective KG is adopted, the present invention prevents uneven flow from occurring in the water jacket in the cylinder head, and prevents cooling from being inhibited by the occurrence of air pockets. It is an object of the present invention to provide a quarter jacket structure that enables effective cooling of a cylinder head without causing any problems.

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 connects the upper surface of the water jacket F in the cylinder head with the engine. It is formed by tilting in the opposite direction by an angle greater than or equal to the angle.

Desirable cooling water passages of the cylinder head of the present invention are described below.
Examples will be described with reference to the drawings.

FIG. 3 schematically shows a cylinder head of a multi-cylinder engine for a vehicle. 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.

Reference numerals 23a, 23b, 23C, 23d, and 23e designate cylinder head mounting bosses, into which mounting bolts are inserted to secure the cylinder head 21 to a cylinder block (not shown). The positional relationship between the cooling water outlet 22 and the cylinder head mounting boss 23 is as shown in FIG. This crosses the central axis of the cooling water outlet 2 on both sides of the mounting boss 23C.
The areas of the cooling water flow paths 24 and 25 facing 21C are set to be the same.

A quarter 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 in the opposite direction to the engine mounting angle by an angle greater than or equal to the engine mounting angle. In other words, when the engine is installed in a vehicle in a vertical position with the front facing up, as shown in FIG. It is tilted to the rear end at an angle α that is larger than the angle β. In addition, when the engine is installed in a vehicle vertically and with the front downwards, as shown in FIG. When it is formed by rolling backward at an angle α larger than the angle β, it becomes K.

If the engine is mounted horizontally, the seventh
It is mounted horizontally as shown in the figure.

The cylinder head 21 configured as described above can be mounted on a vehicle whether the same cylinder head is installed vertically or horizontally. That is, FIGS. 8 and 119 show the engine installed in a vehicle in a vertical position and with the front up. In the figure, 28 is a radiator hose attached to the cooling water outlet 22, 29 is a radiator, and 30
indicates a suspension system. On the other hand, Figures 10 and 11
The figure shows the engine mounted horizontally on a vehicle. Cylinder head 21 and suspension device 30
Although the space between the two is small, it is not a problem in terms of space.

In addition, in the case of vertical installation, when the engine is mounted upward at the front with a mounting angle β of 0 degrees to 5 degrees, since the upper surface 27 of the water jacket 26 is formed with an angle α of α≧β, cooling The ceiling of the water outlet 22 is located at the highest position compared to the ceiling of other parts,
There are no air pockets forming on the ceiling.

Moreover, in the case of the front downward movement, on the contrary, since the part behind the cooling water outlet 22 is formed in the lower rear part, no air pockets are generated. Therefore, insufficient cooling and local heating of the air pocket due to the formation of the air pocket are prevented.

Furthermore, since the flow path area toward the cooling water outlet 22 on both sides of the mounting boss 23 in the water jacket 26 is equal, the flow of cooling water in the front half and the rear half of the cylinder head 21 becomes equal, and as a result, , the front and rear parts of the cylinder head 21 are cooled almost equally.

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

First, the cooling water outlet from the cylinder head is located in the center of the cylinder head, making it possible to use the cylinder head i in both vertical and horizontal positions. Design changes to the dedicated attachment and water jacket for extracting cooling water required when used for both.
It eliminates the need for a pull-out, and also eliminates the unreasonableness of providing two separate locations for taking out the cooling water for both vertical and horizontal installations.

In addition, the cooling water outlet is located near the center of the cylinder head.
By locating it on one side of the cylinder head and 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, the front and rear parts of the cylinder head can be cooled almost equally. Cooling performance and cooling water temperature can be made uniform.

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

[Brief explanation of the drawing]

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; FIG. 3 is a schematic plan view of a vehicle with a horizontally mounted engine; FIG. 4 is a schematic plan view of the cylinder head to which the cooling water passage of the cylinder head of FIG.
Figure 116 is a cross-sectional view taken along line IV-IV in the figure, Figure 116 is a schematic front view of the cylinder head showing the angular relationship between the front upward mounting angle of the engine and the top surface of the water jacket, and Figure 116 is a cross-sectional view taken along line IV-IV of the figure. FIG. 7 is a schematic front view of the cylinder head when the engine is mounted horizontally on a vehicle, and FIG. 8 is a schematic front view of the cylinder head when the engine to which the present invention is applied is mounted vertically. FIG. 9 is a schematic side view of FIG. 8, FIG. 10 is a schematic plan view of a vehicle equipped with an engine to which the present invention is applied, and FIG. 10 is a schematic side view of FIG. The meanings of the main symbols in the figure are as follows. 21... Cylinder head, 22... Cooling water outlet,
23...Cylinder head mounting boss, 24.25...Cooling water flow path, 26...Water jacket, 27...Top surface of water jacket, 28...Radiator hose, 29...Radiator, 30... ...Suspension system Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] (1) The cooling water outlet of the cylinder head is located in the center of the bald part of the cylinder head, and the upper surface of the quarter jacket in the cylinder head is partially oriented in the opposite direction by an angle equal to or larger than the engine mounting angle. A cooling water passage in a cylinder head characterized by being 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 in the center of the cylinder.)
of. (3) Claim 1! In the cooling water passage of the cylinder head according to item fa11, the cooling water outlet is located near the cylinder head mounting boss, and the area of the cooling water flow path toward the cooling water outlet on both sides of the mounting boss is the same. A turtle. (4) 1% In the cooling water passage of the cylinder head according to claim 1, when the engine is installed in a vehicle in a position K and a front upward position, the cooling water passage in the cylinder head is The top surface of the water jacket is squared off to mount the engine - the top corner - and tilted to the back end. The top surface of the water jacket on the rear side of the cooling water outlet in the cylinder head is tilted downward at an angle greater than the engine mounting angle.