JPH0720328Y2 - Cylinder head oil passage structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an oil passage structure for a cylinder head, and more particularly to an oil passage structure for a cylinder head that can satisfactorily perform lubrication even when starting an internal combustion engine.

[Prior Art] In an internal combustion engine, in order to protect the moving parts of each component, lubricating oil is supplied to lubricate the contact surfaces.

As such a lubricating oil supply structure, for example, the fourth,
There is one shown in FIG. That is, the block side oil passage 10 that guides the lubricating oil that is pressure-fed by the drive of an oil pump (not shown) is supplied to the cylinder flock 104 of the internal combustion engine 102.
6 are formed.

In addition, the cylinder head 108 has a block side oil passage 1
An oil rising passage 110 communicating with 06, a first oil introducing passage 112 communicating with the oil rising passage 110, and a second oil introducing passage 114 communicating with the first oil introducing passage 112.
And a main oil passage 118 communicating with the second oil passage 114 and formed parallel to the cam shaft 116 (on the horizontal line H), and the lubricating oil is guided from the main oil passage 118 to the cam shaft 116 and the rocker arm shaft 120 side. Oil distribution passage 12 as an auxiliary oil passage
2-1, 122-2, 122-3, 122-4, 122-5 are formed.

Further, as shown in FIG. 6, it is parallel to the cam shaft 116 (horizontal line H
The main oil passage 118 is formed in the cylinder head 108, and a plurality of hydraulic lash adjusters 124 are provided, and the main oil passage 1 is provided in the hydraulic lash adjuster 124.
There is a structure where the lubricating oil is supplied from 18.

Further, as the structure of the oil passage, for example, in Japanese Utility Model Laid-Open No. 57-1
No. 01307 and No. 63-171608 are disclosed. The one disclosed in Japanese Utility Model Laid-Open No. 57-101307 is provided with a branch passage for branching the main passage to guide the lubricating oil to the valve operating system, and a check valve for preventing backflow is provided in this branch passage. . Further, the one disclosed in Japanese Utility Model Laid-Open No. Sho 63-171608 secures lubricating oil in a part of the second oil passage and in the third oil passage when the internal combustion engine is stopped, and ensures good lubrication even when restarted. It is something to do.

[Problems to be Solved by the Invention] In the conventional oil passage structure of the cylinder head, when the internal combustion engine stops and the drive of the oil pump is stopped, the lubrication in the oil distribution passage communicating with the main oil passage is performed. Oil flows down to the main oil passage side, and then flows down to the cylinder block side through the oil rising passage.

Therefore, when the internal combustion engine is restarted, there is no lubricating oil in the oil rising passage of the cylinder head, the main oil passage, and the oil distribution passage, and even if the oil pump is driven by the operation of the internal combustion engine. However, there is a problem in that the lubricating oil is not immediately supplied to each portion of the cam shaft and the journal portion, resulting in poor lubrication.

Further, in the internal combustion engine having the hydraulic lash adjuster shown in FIG. 6, air is supplied to the hydraulic lash adjuster when the internal combustion engine is restarted, so that malfunction or abnormal noise of the hydraulic lash adjuster occurs. There is an inconvenience to do.

[Purpose of Invention] Therefore, the purpose of this invention is to eliminate the above-mentioned inconveniences.
By disposing one portion of the main oil passage, which communicates with the oil introduction passage, at a position higher than the other portion of the main oil passage, a part of the lubricating oil is supplied to the other portion of the main oil passage after the internal combustion engine is stopped. It is an object of the present invention to realize an oil passage structure of a cylinder head that can satisfactorily perform lubrication by instantaneously supplying the residual lubricating oil to the camshaft side when the internal combustion engine is restarted.

[Means for Solving the Problems] In order to achieve this object, the present invention relates to an oil rising passage formed in a cylinder head for introducing lubricating oil from the cylinder block side of an internal combustion engine and a fluid communication path to the oil rising passage. The oil introduction passage, the main oil passage which is oriented in the axial direction of the cam shaft held by the cylinder head and communicates with the oil introduction passage, and the lubricating oil is guided from this main oil passage to each part of the cam shaft. In an oil passage structure of a cylinder head having a plurality of oil distribution passages, one portion of the main oil passage communicating with the oil introduction passage is arranged at a position higher than other portions of the main oil passage. To do.

[Operation] According to the configuration of the present invention, when the internal combustion engine is stopped, the lubricating oil is not pumped from the oil pump.
Although the lubricating oil in each oil passage in the cylinder head flows down from the oil rising passage to the cylinder block side, the lubricating oil remains in other parts of the main oil passage at the lower position. Then, when the internal combustion engine restarts, the lubricating oil remaining in other parts of the main oil passage is instantaneously supplied to the camshaft side, so that the lubrication on the camshaft side is good and the moving parts of each part are protected. Can be achieved.

[Embodiment] An embodiment of the present invention will be described in detail and specifically with reference to the drawings.

1 and 2 show a first embodiment of the present invention. In the figure, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a cylinder head, 8 is a cam shaft, 10 is a rocker arm shaft, and 12 is a cylinder head cover.

An end portion of the cam shaft 8 is sealed by a sealing material 14, and a plurality of cam caps 16 rotatably hold the cylinder head 6.

As shown in FIG. 2, a cam 18 is provided on the cam shaft 8, and a slipper portion 20a of a rocker arm 20 is in contact with the cam 18.

The rocker arm 20 is swingably supported by the rocker arm shaft 10 held by the cylinder head 6.

A block side oil passage 22 is formed in the cylinder block 4 so as to guide the lubricating oil pumped by the drive of an oil pump (not shown) so as to be vertically oriented.

Further, the cylinder head 6 is provided with an oil rising passage 24, one end of which communicates with the block side oil passage 22 and is directed upward of the internal combustion engine 2. An oil jet 26 is provided in the middle of the oil rising passage 24.

The other end of the oil rising passage 24 communicates with one end of the first oil introduction passage 28.

As shown in FIG. 2, the center line C1 of the first oil introduction passage 24 is directed obliquely downward to the right at an angle α with respect to the horizontal line H1 with the center O1 on the tip end side of the oil rising passage 24 as the center. The other end side of the first oil introduction passage 24 extends in the width direction Y of the internal combustion engine 2 and opens to the width side end surface 6C of the cylinder head 6.

The other end of the first oil introduction passage 24 is closed by a blind plug 30.

One end side of the second oil introduction passage 32, which faces upward of the internal combustion engine 2, communicates with the middle of the first oil introduction passage 24.

The other end of the second oil introduction passage 32 communicates with the main oil passage 34 located on the left side of the central portion of the internal combustion engine 2 in FIG.

This main oil passage 34, as shown in FIG.
In the longitudinal direction X, that is, the axial direction of the cam shaft 8, and the first main oil passage 34-1 bored from the one end surface 6d-1 of the cylinder head 6 and the other end surface 6d-2 of the cylinder head 6. And a second main oil passage 34-2.

The center line C2 of the first main oil passage 34-1 is the cylinder head 6
It is directed diagonally upward to the right at an angle β1 with respect to the horizontal line H2 about the center O2 on the side of the one end face 6d-1. The other end side of the first main oil passage 34-1 communicates with the other end side of the second oil introduction passage 32.

The center line C3 of the second main oil passage 34-2 is a horizontal line H2 centered on the center O3 on the other end face 6d-2 side of the cylinder head 6.
With respect to the angle β2, it is directed diagonally upward to the left. The second main oil passage 34-2 communicates with the other end of the second oil introduction passage 32 and the other end of the first main oil passage 34-1.

Therefore, in the main oil passage 34, the A portion where the second oil introduction passage 32, the first oil passage 34-1, and the second main oil passage 34-2 meet is located at one end of the first main oil passage 34-1. B1 on the side
It is arranged at a position higher than the part or the B2 part on the one end side of the second main oil passage 34-2.

One end of the first main oil passage 34-1 is closed by a blind plug 36, and the other end of the second main oil passage 34-2 is closed by a blind plug 38.

In the first main oil passage 34-1, oil distribution passages 42-1, 42-2, 42-3 for guiding lubricating oil to the journal portion 40 side of the camshaft 8 are provided.
Are in communication. The oil distribution passage 42 includes a cam shaft oil hole (not shown) formed in the cam shaft 8 and a journal portion 40.
Is in communication with.

Further, oil distribution passages 42-4, 42-5 for guiding the lubricating oil to the rocker arm shaft 10 side communicate with the second main oil passage 34-2. The oil distribution passage 42-5 communicates with a rocker arm shaft oil hole 44 formed in the rocker arm shaft 10.

Next, the operation of the first embodiment will be described.

When the internal combustion engine 2 is operated and an oil pump (not shown) is driven, the lubricating oil from the block side oil passage 22 is transferred to the oil rising passage 24, the first oil introduction passage 28, the second oil introduction passage 32, Main oil passage 34 and each oil distribution passage
It is supplied to the side of the cam shaft 8 and the rocker arm shaft 10 via 42, whereby the moving parts of the respective parts such as the cam shaft 8 and the rocker arm shaft 10 can be lubricated.

Next, when the internal combustion engine 2 is stopped, the driving of the oil pump is stopped and the lubricating oil is no longer pumped. However, in the main oil passage 34, the oil A communicates with the second oil introduction passage 32.
Since the part exists at a position higher than the other B1 part and B2 part, the lubricating oil remains in the first and second main oil passages 34-1 and 34-2, and the first part is formed so as to be inclined. The lubricating oil also remains in the oil introduction passage 28. Therefore, the main oil passage
It is possible to prevent air from entering the inside of 34.

Then, when the internal combustion engine 2 is restarted, residual lubrication in the first oil introduction passage 28 and the first and second main oil passages 34-1 and 34-2 is performed by the lubricating oil supplied from the block side oil passage 22 side. Since the oil is quickly moved from the oil distribution passage 42 to the cam shaft 8 and the rocker arm shaft 10, the lubricating oil can be instantaneously supplied to the cam shaft 8 and the rocker arm shaft 10. Journal part 40 and rocker arm shaft
The sliding surface of the moving part of each part on the 10 side is reliably lubricated,
It is possible to prevent wear and seizure and improve the durability of each component.

FIG. 3 shows a second embodiment of the present invention. In the following embodiments, the portions having the same functions as those of the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, the oil rising passage 24 is provided on the side of one end surface 6d-1 of the longitudinal direction X of the internal combustion engine 2, and the one end surface 6d-1 of the cylinder head 6 to the other end surface of the cylinder head 6 is provided.
A main oil passage 34 is formed so as to penetrate to the 6d-2 side, and the oil rising passage 24 and the main oil passage 34 are connected to each other. The center line C4 of the main oil passage 34 is directed obliquely downward to the right at an angle β3 with respect to the horizontal line H2 with the center O4 on the one end face 6d-1 side of the cylinder head 6 as the center.

Further, one end side of the main oil passage 34 is closed by a blind plug 36, and the other end side of the main oil passage 34 is closed by a blind plug 38.

According to the structure of the second embodiment, as in the case of the first embodiment, when the internal combustion engine 2 is stopped, the inclined main oil passage 34
The lubricating oil is left inside, and when the internal combustion engine 2 is restarted, this residual lubricating oil can be instantaneously supplied to the cam shaft 8 and the rocker arm shaft 10 side, and the hydraulic lash adjuster is connected to the main oil passage 34. Even if it is provided as
Air can be prevented from entering the hydraulic lash adjuster, the operation of the hydraulic lash adjuster can be favorably maintained, and abnormal noise can be prevented.

[Effect of the Invention] As is apparent from the above detailed description, according to the present invention,
By disposing a part of the main oil passage communicating with the oil introduction passage at a position higher than other parts of the main oil passage,
After the internal combustion engine is stopped, one part of the lubricating oil remains in the other low part of the main oil passage, and the remaining lubricating oil is instantaneously supplied to the camshaft side when restarting the internal combustion engine to achieve good lubrication. It is possible to prevent wear and seizure of the moving parts of the respective parts and improve the durability of the respective parts.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic side view of an oil passage structure, and FIG. 2 is a schematic front view of the oil passage structure. FIG. 3 shows a second embodiment of the present invention and is a schematic side view of the oil passage structure. 4 to 6 show a conventional oil passage structure, FIG. 4 is a schematic side view of the oil passage structure, FIG. 5 is a schematic front view of the oil passage structure, and FIG. 6 is an internal combustion engine equipped with a hydraulic lash adjuster. It is a schematic side view of an oil passage structure of an engine. In the figure, 2 is an internal combustion engine, 4 is a cylinder block, and 6
Is a cylinder head, 8 is a cam shaft, 22 is a block side oil passage, 24 is an oil rising passage, 28 is a first oil introduction passage, 32 is a second oil introduction passage, 34 is a main oil passage, and 42 is an oil distribution passage. Is.

Claims (1)

[Scope of utility model registration request] 1. An oil rising passage formed in a cylinder head for introducing lubricating oil from a cylinder block side of an internal combustion engine, an oil introducing passage communicating with the oil rising passage, and a cam shaft held by the cylinder head. An oil passage structure of a cylinder head having a main oil passage axially communicating with the oil introduction passage and a plurality of oil distribution passages for guiding lubricating oil from the main oil passage to respective portions of the cam shaft, An oil passage structure for a cylinder head, wherein one portion of the main oil passage communicating with the oil introduction passage is disposed at a position higher than other portions of the main oil passage.