JPH01117914A - Cooling construction of water cooling type multi-cylinder engine - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of an equipment which cools the external periphery of a cylinder liner with cooling water by separating a cooling water supply passage placed at a cylinder block part at the side of an exhaust valve into both cooling water passages extending on the sides of a cylinder head and a cylinder liner. CONSTITUTION:A V-shaped multi-cylinder engine is provided with both an exhaust valve 23 at one side 7A of a cylinder head 7 and an intake valve 27 at the other side 7B of the cylinder 7, both extending perpendicularly to multiple cylinders 11. In such constitution a cooling water supply passage 35 communicated with a water pump line is formed inside the cylinder block part 5 at the side of the exhaust valve 23, extending beside the lower part of a cylinder 13 in parallel with cylinders 11. A plurality of primary and secondary cooling passages 37 and 39 separate from said supply passage 35, as extending toward the cylinder head 7 and the cylinder liner 5, respectively. A drain passage 41 communicated with the primary cooling passages 37 and 39 extends in parallel with the cylinders 11 on the side 7B of the cylinder liner 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling structure for a water-cooled multi-cylinder engine, and more particularly, to a cooling structure for a water-cooled multi-cylinder engine using a wet cylinder liner.

(Prior Art and Problems to be Solved by the Invention) In a multi-cylinder engine, an exhaust valve is disposed on one side of the cylinder head and an intake valve is disposed on the other side in a direction perpendicular to the direction in which the cylinders are arranged.

In a water-cooled multi-cylinder engine, the engine is generally cooled by first cooling the outer periphery of the cylinder and then cooling the cylinder head.

However, in such a cooling structure, cooling water whose temperature has been raised by the outer periphery of the cylinder is supplied to the cylinder head, and since the portion of the cylinder head near the exhaust valve becomes high temperature, it is possible to improve the cooling efficiency of the cylinder. There is a problem in that it is not possible to improve the cooling efficiency of the cylinder head.

This is especially true in the case where the outer periphery of the cylinder liner is directly cooled by the cooling water, since the temperature of the cooling water is further increased.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to improve the cooling efficiency of both the cylinder liner and the cylinder head in a water-cooled multi-cylinder engine in which the outer periphery of the cylinder liner is directly cooled. is to provide a cooling structure that can be enhanced.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides the following features: An exhaust valve 23 is provided on one side 7A of the cylinder rad 7 and on the other side 7B in a direction perpendicular to the arrangement direction 17 of the cylinders 11. Intake valve 27
This is a cooling structure for a water-cooled multi-cylinder engine l in which the outer circumferential surface of the cylinder liner 15 is directly cooled by cooling water, and the cylinders 11 are arranged in five positions in the cylinder block on the exhaust valve 23 side so that the force of the cylinders 11 is arranged in the direction 17. A cooling water supply passage 35 extends parallel to the cylinder head 7 of each cylinder 11 and branches from the supply passage 35 to the cylinder head 7 side.
A plurality of first cooling paths 37 extending from a portion near the exhaust valve 23 to a portion near the intake valve 27 and reaching the other side 7B of the rad 7 to the cylinder.

A plurality of second cooling passages 39 branch from the supply passage 35 to the cylinder liner 15 side, pass through the outer peripheral surface of the cylinder liner 15, and reach five locations in the cylinder block on the intake valve 27 side, and the other side 7B of the cylinder head 7. Arrangement direction 17 of cylinders 11
The first cooling passage 37 and the second cooling passage 39 extend parallel to each other.
It is characterized by comprising a discharge passage 41 that communicates with.

(Function) Cooling water is supplied from the supply path 35 to the first cooling path 37 and the second cooling path 3.
Divide into 9.

The portion of the cylinder head 7 near the exhaust valve 23, which tends to reach a high temperature due to the cooling water flowing through the first cooling path 37, is first cooled, and then the portion near the intake valve 27 is cooled.

Further, the cylinder liner 15 is directly cooled by the cooling water flowing through the second cooling path 39 .

The cooling water that has cooled the cylinder head 7 and the cylinder liner 15 is discharged from the discharge passage 41.

Therefore, the cooling efficiency of both the cylinder liner 15 and the cylinder head 7 can be improved.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional front view of a main part of an engine, and FIG. 2 is a schematic plan view of a cooling structure according to the present invention.

1 is a V-type water-cooled 8-cylinder engine, the case 3 of the engine 1 consists of a cylinder block 5, a cylinder head 7, a head cover 9, etc., and the cylinders 11 are arranged in a V-shape by the engine case 3 and are arranged in rows of four. .

The cylinder 13 is defined by a wet cylinder liner 15 built into the cylinder block 5.

On one side 7A of the cylinder head 7 in the direction perpendicular to the arrangement direction 17 of the cylinders 11 on the cylinder 13, that is, the V bank 19
In the cylinder door portion 7A on the opposite side, there is an exhaust passage 21.
An exhaust valve 23 is provided to open and close the exhaust valve.

, on the other side 7B of the rad 7 to the cylinder in the direction perpendicular to the direction 17 in which the cylinders 11 are arranged on the cylinder 13, that is, the V bank 1
An intake valve 27 for opening and closing the intake passage 25 is disposed in the cylinder head portion 7B on the 9 side.

Reference numeral 31 shows a cooling structure according to the present invention, and since the engine 1 has two cylinder rows, the present invention is applied to each cylinder row.

The cooling structure 31 includes a supply path 35 connected to the auto bomb 33 side, first and second cooling paths 37 and 39 branching from the supply path 35, a discharge path 41, and the like.

The supply path 35 extends in parallel to the direction 17 in which the cylinders 11 are arranged in a portion of the cylinder block 5 on the side where the exhaust valve 23 is disposed and to the side of the lower part of the cylinder 13. In the embodiment, two supply passages 35 are provided corresponding to two cylinder rows, and the ends of both supply passages 35 are connected to the two cylinder cylinders 33 through pipe bodies 43, respectively.
Connect to.

The first cooling passage 37 is connected to a plurality of passages 45 that branch from the supply passage 35 and extend toward the cylinder head 7 side, and communicates with the passages 45 from the vicinity of the exhaust valve 23 in the cylinder door 7 on each cylinder 13. It is composed of a plurality of passages 47 that pass through a portion near the intake valve 27 and extend to the other side 7B of the cylinder head 7.

The second cooling passage 39 is connected to the cylinder liner 1 from the supply passage 35, respectively.
a plurality of passages 51 branching into 5 sides; an annular passage 53 communicating with each passage 51 and formed along the outer peripheral surface of each cylinder liner 15; It is composed of a passage 55 extending toward the head 7 side.

The discharge passage 41 extends parallel to the direction 17 in which the cylinders 11 are arranged on the other side 7B of the cylinder head 7, and the discharge passage 41 is connected to the downstream portion of the passage 47 of the first cooling passage 37 and the passage 5 of the second cooling passage 39.
5. Formed in communication with the downstream portion.

The end of the discharge passage 41 and the radiator 57 side are connected through a pipe body 59.

Next, the effect will be explained.

Cooling water is supplied from the pipe body 43 to the supply path 35 of each cylinder row by the auto pump 33, and from the supply path 35 to the passage 45.
．． 51, it is divided into a first cooling path 37 and a second cooling path 39.

The portion of the cylinder head 7 near the exhaust valve 23, which tends to reach a high temperature, is first cooled by the cooling water flowing through the passage 47 of the first cooling path 37, and then the portion near the intake valve 27 is cooled.

Further, the cylinder liner 15 is directly cooled by the cooling water flowing through the passage 53 of the second cooling passage 39 .

The cooling water that cooled the cylinder liner 15 is passed through the passage 55.
This leads to the discharge path 41 and is sent from the discharge path 41 to the radiator 57 side via the pipe body 59 together with the cooling water that cooled the cylinder head 7 .

Therefore, according to this embodiment, the cooling efficiency of both the cylinder liner 15 and the cylinder head 7 can be improved.

(Effects of the Invention) As is clear from the above description, according to the present invention, in a water-cooled multi-cylinder engine in which the cylinder liner is directly cooled by cooling water, the cooling efficiency of both the cylinder liner and the cylinder head is improved. A cooling structure can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view of a main part of an engine, and FIG. 2 is a schematic plan view of a cooling structure according to the present invention. In the figure, 5 is the cylinder block, 7 is the cylinder head, 1
5 cylinder litchi, 23 is exhaust valve, 27 is intake valve, 35
is a supply path, 37 is a first cooling path, 39 is a second cooling path, 41
is the discharge path. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi, Patent Attorney, Department
Udo Yama Patent Attorney No 1)
Shigeru 2nd figure

Claims (1)

[Claims] A water-cooled type in which an exhaust valve is arranged on one side of the cylinder head and an intake valve is arranged on the other side in a direction perpendicular to the direction in which the cylinders are arranged, and the outer peripheral surface of the cylinder liner is directly cooled with cooling water. A cooling structure for a multi-cylinder engine, which includes a cooling water supply path that extends parallel to the direction in which the cylinders are arranged at the cylinder block location on the exhaust valve side and communicates with the water pump side, and a cooling water supply path that branches off from the supply path to the cylinder head side. The cylinder head of each cylinder includes a plurality of first cooling paths extending from a portion near the exhaust valve to a portion near the intake valve to the other side of the cylinder head, and a plurality of first cooling paths each branching from the supply path to the cylinder liner side and connecting the cylinder liner side to the cylinder liner side. a plurality of second cooling passages passing through the outer circumferential surface of the cylinder head and reaching a cylinder block location on the intake valve side; and the first cooling passage and second cooling passage extending parallel to the direction in which the cylinders are arranged on the other side of the cylinder head. A cooling structure for a water-cooled multi-cylinder engine, comprising an exhaust passage communicating with the water-cooled multi-cylinder engine.