JPH0115882Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling water passage device for a water-cooled V-type multi-cylinder engine.

Conventionally, in a water-cooled V-type multi-cylinder engine in which first and second engine blocks each having a plurality of cylinders arranged side by side are arranged in a V-shape, the first and second engine blocks are arranged in a V-shape, as shown in FIGS.
The lower portions of the opposing cylinder walls 03 ₁ and 03 ₂ of the second engine blocks E' ₁ and E' ₂ are connected by a bottom wall 04, and a pair of left and right cooling water is installed on both left and right sides of this bottom wall 04. Distribution parts D′l and D′r are provided, and these distribution parts
D'l and D'r are communicated with the water jackets ₀₂₁ and _{022 of the opposing cylinders C'1 and C'2 of the} first and second engine blocks _E'1 and _E'2 , respectively, so that the cooling water Distribution section
The cooling water is supplied to each of the water jackets 02 ₁ and 02 ₂ from D'l and D'r. Incidentally, in such an engine, the upper surface of the bottom wall 04 is surrounded by the first and second engine blocks E' ₁ and E' ₂ and the pair of cooling water distribution parts D'l and D'r. Therefore, if water from cleaning the engine accumulates on the top surface of the bottom wall 04, it will be difficult to perform maintenance on various parts, so it is necessary to immediately drain water dripping onto the top surface to the outside. Therefore, the upper surface level L' of the bottom wall 04 is set at a relatively high level, that is, the cylinder walls 03 ₁ , 03 ₂ and the cooling water distribution section, so that the upper surface of the bottom wall 04 does not become a surrounded recess.
The lowest part of the boundary between D'l and D'r is located at approximately the same level as the lowest part d', as shown by the arrow in Figure 3.
Water flows out from d′. In addition, as shown in FIG. 3, wet liners _{01 1 , 01 2 (} direct water jackets 02 ₁ ,
02 (contact with cooling water in ₂ )
The lower part of the wet liner 01 ₁ , 01 ₂ is connected to the bottom wall 0
4, the water jackets 02 ₁ and 02 ₂ cannot be formed deeply because of the support wall 04a, and the positions of the cooling water distribution parts D'l and D'r are reduced accordingly. , the upper surface level L' of the bottom wall 04 cannot be lowered, the support wall 04a becomes longer, and the position of the pair of cooling water distribution parts D'l and D'r becomes higher. For some reason, the overall volume of the bottom wall 04 becomes large, and the bottom wall 04, especially its support wall 04a, has a large amount of waste, which not only causes an increase in the weight of the entire engine but also increases cost. There was a problem.

The present invention was developed in view of the above-mentioned circumstances, and even if the bottom walls of the opposing cylinder walls of the first and second engine blocks are at a low position, water etc. stored there can be immediately discharged to the outside. So,
By making it possible to significantly reduce the amount of waste on the bottom wall,
It is an object of the present invention to provide a cooling water passage device for a water-cooled V-type engine that has a simple structure and is designed to reduce the weight and cost of the engine.

According to the present invention, in order to achieve the above purpose, first,
The lower portions of the opposing cylinder walls of the second engine block are integrally bridged by a bottom wall, and cooling water distribution portions are provided on both sides of the bottom wall to communicate with the water jackets of the first and second engine blocks. In a water-cooled V-type engine, the first and second engine blocks and the pair of cooling water distribution sections surround the top surface of the bottom wall, the top surface level of the bottom wall being is located lower than the lowermost part of the boundary between the first and second engine blocks and the pair of cooling water distribution parts, and the liquid stored on the bottom wall is placed below the cooling water distribution part. It is characterized by having a drain hole for draining liquid.

An embodiment in which the present invention is applied to a V-type four-cylinder internal combustion engine will be described below with reference to FIGS. 1 and 2.

A first engine block E 1 has two cylinders C ₁ and C ₂ arranged side by side, and a second engine block E ₁ has two cylinders C ₂ and C ₂ arranged side by side opposite to these cylinders C ₁ and C ₂ . The engine block _E2 is arranged in a V-shape with respect to the engine block E2. Inside the cylinder holes of each cylinder C ₁ , C ₁ and C ₂ , C ₂ are wet liners 1 ₁ ,
1 ₁ and 1 ₂ , 1 ₂ are press-fitted, and the wet liners 1 ₁ , 1 ₁ and 1 ₂ , 1 ₂ are connected to the cylinder.
Annular water jackets 2 ₁ , 2 ₁ and 2 ₂ , _{2 2 are} formed between C ₁ , C ₁ and C ₂ , C 2 , respectively. These water jackets 2 ₁ , 2 ₁ and 2 ₂ ,
2 ₂ is communicated with a pair of left and right cooling water distribution sections Dl and Dr, which will be described later, and is configured to be supplied with cooling water from these distribution sections Dl and Dr.

The lower ends of the opposing cylinder walls 3 ₁ and 3 ₂ of the first and second engine blocks E ₁ and E ₂ are integrally bridged by a bottom wall 4, and the left and right sides of this bottom wall 4 (second
The pair of cooling water distribution sections Dl and Dr are provided in the upper and lower portions of the figure, respectively. As shown in FIG. 2, the upper surface of the bottom wall 4 is surrounded by the first and second engine blocks E ₁ and E ₂ and the cooling water distribution parts Dl and Dr.
surrounded by. The cooling water distribution section Dl
and Dr _are constructed by branching a pair of front and rear distribution passages 6 and 7 before and after the cooling water reservoir 5, respectively, and each front distribution passage 6 is connected to the water jacket ₂₁ of the first engine block E1, and each The rear distribution channels 7 each communicate with the water jackets ₂₂ of the second engine block _E2 . Therefore, the upper surface level L of the bottom wall 4
are the first and second engine blocks E ₁ , E ₂ ,
It is located as low as possible than the lowermost part d of the boundary between the cooling water distribution parts Dl and Dr.

Cooling water reservoirs 5 of the left and right cooling water distribution parts Dl and Dr,
The opening upper surface of 5 is communicated with a cooling water supply passage 8 having caps 8a, 8a at both ends, and this cooling water supply passage 8 is communicated with a cooling water circuit 9 connected to a cooling water pump and a radiator (not shown). .

Below the left and right cooling water distribution parts Dl and Dr, liquid drain holes 10l and 10r are provided for the cylinders C ₁ , C ₁ and C ₂ ,
These drain holes 10l and 10r are respectively formed integrally in the same direction as the arrangement direction of C ₂ , and are inclined slightly downward toward the outside of the engine E, and their inner ends are opened on the upper surface of the bottom wall 4. and their outer ends are opened outward on both the left and right sides of the engine E. Therefore, the cleaning water etc. that have fallen onto the bottom wall 4 immediately pass through the drain holes 10l and 10r to the first,
It is possible to discharge it to the outside from the second engine blocks E ₁ and E ₂ .

Next, the operation of the embodiment of the present invention will be explained.

The cooling water pumped from the cooling water circuit 9 to the cooling water supply path 8 is transferred from the supply path 8 to the left and right cooling water distribution sections.
Dl and Dr, and from there are supplied to the water jackets 2 ₁ and 2 ₂ through the front and rear distribution channels 6 and 7, respectively, to cool the first and second engine blocks E ₁ and E ₂ with water. can.

In addition, if cleaning water, etc. falls and accumulates on the bottom wall 4 between the first and second engine blocks E ₁ and E ₂ due to engine flushing, etc., the accumulated water immediately passes through the drain holes 10l and 10r to the outside. The bottom wall 4 is connected to the first and second engine blocks.
Even if a concave portion is formed surrounded by E ₁ and E ₂ and the cooling water distribution portions Dl and Dr, no water or the like remains on the bottom wall 4. Furthermore, as the upper surface level L of the bottom wall 4 is lowered, the positions of the front and rear cooling water distribution passages 6 and 7 are also lowered, and waste material, especially the support wall 4a that supports the lower part of the wet liner 1 ₁ and 1 ₂ , is minimized. can be kept to a minimum.

As described above, according to the present invention, the upper surface level of the bottom wall bridging together the lower portions of the cylinder walls of the first and second engine blocks is connected to The liquid drain hole for discharging the liquid stored on the bottom wall is located at a lower level than the lowest boundary with the water distribution part and below the cooling water distribution part, so that the upper surface of the bottom wall is level. Even if the bottom wall is placed as low as possible, there is no need to worry about liquid such as cleaning water accumulating on the top surface, and by lowering the top surface level of the bottom wall, the cooling water distribution section can also be lowered. Compared to the conventional engine, the amount of waste on the bottom wall can be significantly reduced, the volume of the bottom wall can be reduced as a whole, and the weight and cost of the engine body can be reduced.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the device of the present invention, where Figure 1 is a vertical sectional side view taken along the line - - of Figure 2, Figure 2 is a plan view taken along the line - Figure 1, and Figures 3 and 4. 3 shows a conventional one, FIG. 3 is a longitudinal sectional side view taken along the line of FIG. 4, and FIG. 4 is a plan view taken along the line of FIG. 3. E ₁ , E ₂ ...first and second engine blocks,
C ₁ , C ₂ ... Cylinder, Dl, Dr ... Left and right cooling water distribution section, d ... Bottom of boundary, 2 ₁ , 2 ₂ ... Water jacket, 3 ₁ , 3 ₂ ... Cylinder wall, 4 ... bottom wall.

Claims (1)

[Scope of utility model registration request] First and second engine blocks having at least two cylinders arranged side by side are arranged in a V-shape, and the lower portions of opposing cylinder walls of the first and second engine blocks are bridged together with a bottom wall. A cooling water distribution section communicating with the water jackets of the first and second engine blocks is provided on both sides of the bottom wall, and the cooling water distribution section is provided as a pair with the first and second engine blocks. In the water-cooled V-type engine, the top surface of the bottom wall is located at the boundary between the first and second engine blocks and the pair of cooling water distribution sections. A water-cooled type V characterized by having a drain hole located lower than the lower part and below the cooling water distribution section for discharging the liquid stored on the bottom wall.
Cooling water passage device for type engines.