JPH0629529B2 - Internal combustion engine oil passage - Google Patents

Abstract

PURPOSE:To improve oil supply efficiency by forming a first path for supplying oil from an oil pump in the direction of cylinder row at the side of crank chamber while forming a second path extending in same direction at the side of valve system chamber then coupling both paths through a plurality of communication paths arranged with intervals in the direction of cylinder row. CONSTITUTION:In a V-type internal combustion engine, a first path 11 is formed in a cylinder block 1 in the center of a V bank 8 while extending in longitudinal direction of a cylinder row S, and oil sucked through an oil pump 6 is fed through an oil supply path 7 to the first path 11. A plurality of branch paths 12 directing toward lower crank chamber are also formed in the first path 11. A second path 21 extending in longitudinal direction of the cylinder row S is formed in a cam shaft (not shown) provided with cams corresponding to respective cylinders, where the first and second paths 11, 12 are coupled through a plurality of communication paths 15 (13, 14, 16, 17) arranged with intervals in longitudinal direction of the cylinder row S.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil passage of an internal combustion engine, and in particular, it is provided on a crank chamber side and a valve chamber side on a cylinder, respectively, and extends in a longitudinal direction of a cylinder row. The present invention relates to a connection structure between oil passages.

(Prior Art) In an internal combustion engine, oil passages extending in the longitudinal direction of a cylinder row are provided on a crank chamber side and a valve operating chamber side on a cylinder, respectively, and both oil passages are conventionally connected by a single communicating passage. The oil sent from the oil pump was supplied to the crank chamber and the valve operating chamber, respectively.

(Problems to be Solved by the Invention) However, even if both oil passages are connected by a single communication passage substantially at the center in the longitudinal direction of the cylinder row, in the case of multiple cylinders, the connection from the communication passage position to the valve chamber side Since the distance to both ends of the oil passage is long, it becomes a problem to sufficiently supply the oil to both ends of the valve operating chamber especially during the initial operation of the engine.

Therefore, an object of the present invention is to provide an internal combustion engine in which the oil passages provided on the crank chamber side and the valve operating chamber side on the cylinder respectively and extending in the longitudinal direction of the cylinder rows are connected by a communication passage. To the both ends of the valve chamber on the oil passage side, providing an oil passage that allows sufficient oil to be supplied to both ends of the valve chamber during initial engine operation even in the case of multiple cylinders. To do.

(Means for Solving Problems) In order to solve the above problems and achieve the object, the present invention is provided in the crank chamber side, and the oil sent from the oil pump 6 is flowed in the longitudinal direction of the cylinder row. Passage 11 and this first
A branch passage 12 that branches off from a plurality of points in the longitudinal direction of the passage 11 and divides the oil into the crank chamber, and a branch passage 12 that branches from a plurality of points in the longitudinal direction of the first passage 11 to divide the oil toward the valve operating chamber. A plurality of communication passages 15 ..., which are provided on the valve operating chamber side on the cylinder and extend in the longitudinal direction of the cylinder row,
Second passage 21 for supplying oil from 5 to each part of the valve operating chamber
Which is an oil passage of an OHC type (overhead valve type overhead camshaft type) internal combustion engine, in which a second passage 21 is partitioned into at least two chambers 22 in the longitudinal direction and is connected to each of these chambers 22. It is characterized in that oil is supplied through the passages 15 ...

(Operation) The oil sent from the oil pump 6 is divided from the first passage 11 into the crank chamber side passing through the branch passages 12 ... And the valve operating chamber side passing through the plurality of communication passages 15. The oil split to the valve operating chamber side is divided into the chambers 22 defined in the second passage 21.
Is supplied to ... Via the communication passage 15.

(Examples) Examples will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic front view of an internal combustion engine in which a cylinder array S to which the present invention is applied is arranged in a V type. 1 is a V type cylinder block, 2 is a lower case, 3 is a cylinder head, 4 is a cam case, 5 is a It is a head cover. Cylinder block 1
A crankcase is formed by connecting a lower case 2 to the lower center of the cylinder case, an oil pump 6 is provided in the lower case 2, a cylinder head 3 is connected to the left and right of the cylinder block 1, and a valve operating on the cylinder head 3. A head cover 5 is connected via a cam case 4 forming a chamber.

The oil pumped up by the oil pump 6 is sent to the center of the V bank 8 through the supply passage 7 formed in the cylinder block 1, and the supply passage 7 opens to the first passage 11 formed in the cylinder block 1 at the center of the V bank 8. There is. The first passage 11 is formed so as to extend in the longitudinal direction of the cylinder row S and has a plurality of branch passages 12 that hang down toward the lower crank chamber.
…have.

A passage 13 that rises along the V bank 8 side is formed on the left and right sides of the cylinder block 1, and the passage 13 has a lower end opened to the first passage 11, and the cylinder head 3 is continuously connected to the passage 13 and has an upper surface. An open passage 14 is formed. In the embodiment, for a V-type 8-cylinder internal combustion engine, the cylinder head 3 has four cylinder bores B ... As shown in FIG. 2, and the passages 14 and 14 are located between the two cylinder ends B ... is doing. The passage 14 and the passage 13 continuous downward form a continuous passage 15 to a second passage described later.

On the upper surface of the cylinder head 3 in the cam case 4, a plurality of bearing blocks 31 are coupled between the cylinder bores B and between both ends thereof, and in the embodiment, two cam shafts for intake and exhaust valves are provided for each DOHC type valve mechanism. 41 ... is each bearing block 31 ...
Supported above. Of these, two bearing blocks 31, 31 provided at positions corresponding to the passages 14, 14.
A passage 16 continuous with the passage 14 is formed therein, and a passage 17 continuous with the passage 16 and extending in a direction perpendicular to the cylinder row S is formed therein.

As shown in FIGS. 3 and 4, in the center of the bearing recesses 32 on the left and right of the bearing block 31, there is a passage 18 continuous with the passage 17 inside.
Is formed, and the passage 18 opens upward from the long groove 19. The lower half of the journal 42 of the cam shaft 41 is supported in the bearing recess 32 via a metal bearing 33, and the upper half of the journal 42 is in the bearing recess 36 of the bearing block 35 coupled on the bearing block 31 to the metal bearing 37. Supported through.

The cam shaft 41 is provided with two cam portions 43 ... Which correspond to each cylinder before and after each journal portion 42.
A second passage 21 is formed inside. That is, the hollow camshaft 4
A hollow shaft 45 is inserted into the shaft 1. A large diameter portion 46 is formed on the outer circumference of the hollow shaft 45 so as to contact the inner circumference of the cam shaft 41 in correspondence with each journal portion 42. An O-ring 47 ... Is fitted on. As a result, between the inner circumference of the cam shaft 41 and the outer circumference of the hollow shaft 45, the passages 22 partitioned by the large diameter portions 46 are formed for each cylinder.

And the two bearing blocks 3 in which the passages 18 are open
Openings 23, 23 continuous with the front and rear passages 22, 22 are formed in the two journal portions 42, 42 of the cam shaft 41 corresponding to 1, 31 respectively. This opening 23, 23
Is the two long holes 24, 2 formed in the lower metal bearing 33.
4 are provided corresponding to No. 4, and oil ejection holes 25 ... Are formed on the base circular surface of each cam portion 43.

With the above, an oil passage as schematically shown in FIG. 5 is constructed.

That is, the one supply passage 7 extending from the oil pump 6 is connected to the center of the first passage 11 extending in the longitudinal direction of the cylinder row S, and the four branch passages 1 for sending oil to the lower crank chamber are provided.
From this first passage 11 having 2 ..., Four communication passages 15 ... The communication passages 15 ... are the front and rear branch passages 12, 1.
In the center between the two, two cylinder rows S are provided for each of the front and rear with respect to the first passage 11.
Are provided at intervals in the longitudinal direction.

The two left and right communication passages 15, 15 are first connected to the V bank 8
It is connected to the front and rear of the second passage 21 located inside and sending oil to the valve operating chamber in the upward direction, and in the direction perpendicular to the cylinder row S with respect to the front and rear of the second passage 21 located outside the V bank 8. The two passages 17 extending from each other are connected to each other.

In this way, the oil is sent from the first passage 11 to the respective second passages 21 through the two communicating passages 15 which are spaced from each other in the longitudinal direction of the cylinder row S, so that the communicating passages 15 ...
The distance from the position to both ends of the second passage 21 becomes shorter than in the conventional case. Particularly, in the embodiment, since the second passage 21 is divided into four short passages 22 ... Before and after corresponding to each cylinder,
Since the oil supply efficiency is excellent, the oil can be sufficiently supplied to both ends of the valve operating chamber together with the structure of the communication passages 15 ... In the initial operation of the engine.

Although the V-type internal combustion engine has been described above, the present invention can be applied to a horizontally opposed type or in-line type internal combustion engine having a cylinder array.

Further, the valve mechanism type may be an OHC type, and the number of intake / exhaust valves and the number of cylinders are not limited to those in the embodiment, but the advantage of the present invention is most effectively exerted particularly in the case of an internal combustion engine having multiple cylinders.

Further, in the embodiment, the hollow shaft is inserted into the cam shaft, the second passage is formed between them, and it is further divided into a plurality of passages.
Of course, the present invention may be applied to the one in which the cam shaft has an oil passage without using a hollow shaft as is usually done.

(Advantages of the Invention) According to the present invention described above, the branch passage for dividing the oil into the crank chamber and the plurality of communicating passages for dividing the oil toward the valve operating chamber are provided at a plurality of positions in the longitudinal direction of the first passage. By connecting a plurality of communication passages to the second passage that is provided on the valve operating chamber side on the cylinder and is supplied to each part of the valve operating chamber, the oil sent from the oil pump is directly passed through the branch passage. Since it is supplied to the valve operating chamber side on the cylinder, the distance of the supply passage from the oil pump to the valve operating chamber side can be shortened, and oil can be sufficiently supplied to the valve operating chamber during the initial operation of the internal combustion engine.

Further, since the second passage is divided into at least two chambers in the longitudinal direction and the oil is supplied to each of these chambers via the communication passage, the oil flow is influenced by the length of the second passage. In addition, the oil flow in each chamber is not affected by the other chambers, and the oil can be quickly and sufficiently supplied to the valve operating chamber during the initial operation of the internal combustion engine.

[Brief description of drawings]

FIG. 1 is a schematic front view of an internal combustion engine to which the present invention is applied, and FIG.
FIG. 4 is a schematic top view of a cylinder head, FIG. 3 is an exploded perspective view of a bearing structure of a cam shaft, FIG. 4 is a vertical sectional side view of the same part, and FIG. 5 is a schematic configuration diagram of an oil passage according to an embodiment. is there. In the drawings, S is a cylinder row, 6 is an oil pump, 11 is a first passage, 12 is a branch passage, 15 is a communication passage, 21 is a second passage, 22 is a chamber (passage), and 41 is a cam shaft. .

Claims (1)

[Claims] 1. A first passage provided on the crank chamber side for flowing oil sent from an oil pump in a longitudinal direction of a cylinder row; and a first passage branched from a plurality of longitudinal locations of the first passage.
A branch passage for branching the oil to the crank chamber, and a plurality of branches in the longitudinal direction of the first passage.
A plurality of communication passages that divide the oil to the valve operating chamber side; and a plurality of communication passages that are provided on the valve operating chamber side on the cylinder and that extend in the longitudinal direction of the cylinder row to supply oil from the communication passages to each part of the valve operating chamber. An oil passage of an OHC type internal combustion engine comprising two passages, wherein the second passage is divided into at least two chambers in the longitudinal direction, and oil is supplied to each of these chambers through the communication passage. An oil passage for an internal combustion engine, which is configured as described above.