JPH0622092Y2 - Internal combustion engine oil passage - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an oil passage of an internal combustion engine, which can secure sufficient hydraulic pressure without using a particularly large oil pump and can prevent lubrication failure at restart. The present invention relates to an oil passage of an internal combustion engine that prevents generation of the oil.

[Conventional technology]

The OHC (overhead cam) type valve operating mechanism includes a SOHC (single overhead head cam) type valve operating mechanism in which one cam shaft is arranged along a plane including the axis of the cylinder. There is a DOHC (double over head cam) in which two cam shafts for intake and exhaust are arranged close to the valve and the exhaust valve, respectively.

Examples of the OHC type valve operating mechanism include Japanese Patent Laid-Open No. 60-1
Some are disclosed in Japanese Patent No. 78911. The one described in this publication has a configuration in which the camshaft is lubricated after lubricating the hydraulic tappet, and it is possible to dispose the spark plug in the vicinity of the cylinder axis in spite of having only one camshaft. The lubrication of each part can be easily performed.

[Problems to be solved by the invention]

Meanwhile, in the oil passage of the conventional internal combustion engine, as shown in FIG. 5, the lubricating oil discharged from the oil pump (not shown) flows from the first oil passage 108, which is a main gallery in the cylinder block 104, to the cylinder head 106.
The second oil passage 110, the fourth oil passage for lubricating the cam shaft 116 in the cam cover 114, and the third oil passage 112 for lubricating the hydraulic tappet (not shown) are sequentially circulated. That is, the hydraulic tappet is lubricated after the camshaft is lubricated.

Therefore, when lubricating the hydraulic tappet after lubricating the camshaft, the hydraulic pressure decreases, and it is necessary to increase the capacity of the oil pump in order to secure the required hydraulic pressure, which is costly and economically disadvantageous. There is an inconvenience.

Further, the configuration disclosed in JP-A-60-178911 does not describe the configuration of the oil passage from the oil pump to the third oil passage for lubricating the hydraulic tappet.

Therefore, for example, a general oil passage will be described. When the internal combustion engine is stopped, all the oil in each oil passage flows back through the oil passage. As a result, when the internal combustion engine is started, it takes a long time until the required hydraulic pressure is supplied to each lubrication point, and there is an inconvenience that the lubrication temporarily becomes defective.

[Purpose of device]

Therefore, in order to eliminate the above-mentioned inconvenience, an object of the present invention is to provide a first oil passage, one end of which communicates with an oil pump and which passes through the inside of a cylinder block, and the other end of which passes through the inside of a cylinder head. A second oil passage connected to the second oil passage, and a third oil passage formed in a substantially horizontal direction in the cylinder head for lubricating a hydraulic tappet portion is connected to the second oil passage. A configuration is provided in which a fourth oil passage that lubricates the camshaft portion is provided, and the middle of the second oil passage is guided to a position above the third oil passage where the cylinder head is joined to the cam cover, and then connected to the third oil passage. As a result, sufficient hydraulic pressure can be secured without using a large oil pump, and poor lubrication occurs when the internal combustion engine is restarted. In realizing the oil passage of the internal combustion engine capable of reliably prevented.

[Means for solving problems]

In order to achieve this object, the present invention provides a first oil passage in an oil passage of an internal combustion engine for supplying lubricating oil to each part, the first oil passage having one end communicating with an oil pump and passing through a cylinder block. A second oil passage that passes through the cylinder head is connected to the other end of the oil passage, and a third oil passage that is formed substantially horizontally in the cylinder head and that lubricates a hydraulic tappet portion is connected to the second oil passage. In addition, a fourth oil passage for lubricating the camshaft portion in the cam cover is provided in the third oil passage, and the middle of the second oil passage is joined to the cam cover of the cylinder head located above the third oil passage. It is characterized in that it is configured to be connected to the third oil passage after being guided to the surface position.

[Action]

With the configuration described above, when the internal combustion engine is stopped, the lubricating oil is secured in the third oil passage that lubricates the hydraulic tappet portion, and the occurrence of poor lubrication at the time of restarting the internal combustion engine can be reliably prevented. Sufficient hydraulic pressure is secured without using a large oil pump.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.
In FIGS. 1 and 2, 2 is an engine part, 4 is a cylinder block, and 6 is a cylinder head. The engine section 2
The cylinder block 4 is provided with a first oil passage 8 having one end communicating with an oil pump (not shown) and passing through the inside of the cylinder block 4, and the other end 8b of the first oil passage 8 is provided with the inside of the cylinder head 6. The second oil passage 10 passing therethrough is connected and provided.

Then, the second oil passage 10 is connected to the intake second oil passage 1
0-1 and the exhaust second oil passage 10-2 are provided so as to be branched.

Further, the intake and exhaust second oil passages 10-1, 10-
The third oil passages 12-1 and 12-2 for intake and exhaust, which are formed in the cylinder head 6 in a substantially horizontal direction in order to lubricate an unillustrated hydraulic tappet portion, are connected to the second oil passage 2 and these third oil passages, respectively. 12-1 and 12-2 respectively include fourth oil passages 18-1 and 18-2 for lubricating the camshafts 16-1 and 16-2 in the intake and exhaust cam covers 14-1 and 14-2, respectively. Set up.

Further, when the second oil passage 10 is formed, after the middle of the second oil passage 10 is guided to a position 6f above the third oil passage 12, which is a joint surface 6f with the cam cover 14 of the cylinder head 6. It is configured to be connected to the third oil passage 12.

That is, the ascending passage portion 10A that supplies the lubricating oil from the second oil passage 10 to the joint surface 6f with the intake and exhaust cam covers 14-1 and 14-2 of the cylinder head 6.
And a descending passage portion 10B that supplies lubricating oil to the intake and exhaust third oil passages 12-1 and 12-2 in the cylinder head 6 obliquely below the joining surface 6f.

Reference numeral 20 is an oil venturi provided in the middle of the second oil passage 10.

Next, the operation will be described.

When the internal combustion engine is driven, an oil pump (not shown) is driven, and the lubricating oil reaches the second oil passage 10 in the cylinder head 6 through the first oil passage 8 in the cylinder block 4. Lubricating oil is supplied to the third intake and exhaust oil passages 12-1 and 12-2 for lubricating a hydraulic tappet portion (not shown) through the branched second intake and exhaust oil passages 10-1 and 10-2, respectively. Is supplied to the camshafts 16-1, 16- from the third oil passages 12-1, 12-2.
Fourth oil passages 18-1 and 18- that respectively lubricate two parts
2 is supplied.

When the internal combustion engine is stopped, the lubricating oil in the ascending passage portion 10A that supplies oil to the joint surface 6f flows down, but from the second oil passage 10 to the third oil passages 12-1 and 1-2.
The lubricating oil in the descending passage portion 10B that supplies oil to 2-2 does not flow down, and the lubricating oil is secured in this descending passage portion 10B and the third oil passages 12-1 and 12-2.

Thus, when the internal combustion engine is stopped, it is possible to secure the lubricating oil in the descending passage portion of the second oil passage and the third oil passage, and it is possible to reliably prevent the occurrence of lubrication failure when the internal combustion engine is restarted.

In addition, since the camshaft is lubricated after lubricating the hydraulic tappet part, it is possible to prevent the hydraulic pressure from decreasing during lubrication, and it is possible to secure the required hydraulic pressure without using a large oil pump. It can be inexpensive and economically advantageous.

Further, when the second oil passage is formed in the cylinder head, the joint surface with the cam cover is utilized, so that the structure is simplified, the manufacturing is facilitated, and the cost can be reduced.

Furthermore, the configuration of this embodiment can contribute to simplification and downsizing of the exhaust gas recirculation system.

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

The feature of the second embodiment is that the horizontal passage portion 30 is formed in the second oil passage 30 formed in the cylinder head 6.
B is provided.

That is, as shown in FIG. 3, the second oil passage 30
An ascending passage portion 30A for supplying lubricating oil to the joint surface 6f with the intake and exhaust cam covers 14-1, 14-2 of the cylinder head 6, and a horizontal passage portion 30B extending horizontally from the joint surface 6f. The third intake and exhaust ports in the cylinder head 6 below the end of the horizontal passage 30B
It is formed by the descending passage portion 30C that supplies lubricating oil to the oil passages 12-1 and 12-2. In addition, the horizontal passage portion 30B is connected to the joint surface 6f and the intake / exhaust cam cover 1
It is formed by the excision parts 32-1 and 32-2 provided in 4-1 and 14-2.

Then, when the internal combustion engine is stopped, as in the above-described first example, the lubricating oil can be secured in the descending passage portion of the second oil passage and the third oil passage, and the lubrication failure occurs when the internal combustion engine is restarted. Can be reliably prevented.

Further, since the camshaft is lubricated after lubricating the hydraulic tappet portion, it is possible to prevent a decrease in the hydraulic pressure during lubrication, as in the case of the above-described first embodiment, and the required hydraulic pressure can be achieved without using a large oil pump. Can be secured, the cost can be reduced, and it is economically advantageous.

Further, since the horizontal passage portion is formed by the joining surface of the cylinder head and the cutout portion provided on the intake and exhaust cam covers, the structure can be simplified, the manufacturing becomes easy, and the cost can be reduced.

The invention is not limited to the first and second embodiments described above, and various application modifications are possible.

For example, in the second embodiment of the present invention, the horizontal passage portion 3 provided in the second oil passage 30 of the cylinder head 6 is provided.
0B to the joint surface 6f and the intake and exhaust cam cover 14-
Although it is configured to be formed by the cutouts 32-1 and 32-2 provided in the first and the second 14-2, as shown in FIG. 4, the intake and exhaust cam covers 14-1 and 14-2 are not cut off. Is provided with a cutout portion 40 on the joint surface 6f of the cylinder head 6, and the second oil passage 42 is formed by the intake and exhaust cam covers 14-1, 14-2 and the cutout portion 40 on the joint surface 6f.
It is also possible to form the horizontal passage portion 42B.

[Effect of device]

As described in detail above, according to the present invention, a first oil passage having one end communicating with the oil pump and passing through the cylinder block is provided, and the other end of the first oil passage is provided with the second oil passage passing through the cylinder head. An oil passage is connected to the second oil passage, and a third oil passage formed in the cylinder head in a substantially horizontal direction to lubricate the hydraulic tappet portion is connected to the second oil passage. Since a fourth oil passage for lubricating the above is provided, and the middle of the second oil passage is guided to a position above the third oil passage where it is joined to the cam cover of the cylinder head, it is connected to the third oil passage. The lubricating oil can be secured in a part of the second oil passage and in the third oil passage when the internal combustion period is stopped, and the occurrence of lubrication failure when the internal combustion engine is restarted. The can be reliably prevented. In addition, since the camshaft is lubricated after lubricating the hydraulic tappet part, it is possible to prevent the oil pressure from decreasing during lubrication, and it is possible to secure the necessary oil pressure without using a large oil pump, which can reduce the cost. Therefore, it is economically advantageous.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic sectional view of an oil passage of an internal combustion engine, and FIG. 2 is a schematic enlarged sectional view of a cylinder head. FIG. 3 is a schematic sectional view of an oil passage of an internal combustion engine showing a second embodiment of the present invention. FIG. 4 is a schematic sectional view of an oil passage of an internal combustion engine showing another embodiment of the present invention. FIG. 5 is a schematic sectional view of an oil passage of an internal combustion engine showing the prior art of the present invention. In the figure, 2 is an engine part, 4 is a cylinder block,
6 is a cylinder head, 6f is a joint surface, 8 is a first oil passage, 8b is the other end, 10 is a second oil passage, 10-1 is a second oil passage for intake, and 10-2 is a second oil passage for exhaust. 10A is an ascending passage portion, 10B is a descending passage portion, 12-
1 is a third oil passage for intake, 12-2 is a third oil passage for exhaust, 14-1 is a cam cover for intake, 14-2 is a cam cover for exhaust, 16-1 and 16-2 are cam shafts, 18-
Reference numerals 1 and 18-2 are fourth oil passages, and 20 is an oil venturi.

Claims (1)

[Scope of utility model registration request] 1. An oil passage of an internal combustion engine for supplying lubricating oil to respective parts, wherein a first oil passage communicating with an oil pump at one end thereof and passing through a cylinder block is provided, and the other end of the first oil passage is provided. A second oil passage that passes through the inside of the cylinder head is provided so as to be connected, and a third oil passage that is formed in a substantially horizontal direction inside the cylinder head and that lubricates a hydraulic tappet portion is connected to the second oil passage, and the third oil passage is also provided. A fourth oil passage for lubricating the cam shaft portion in the cam cover is provided in the passage, and the middle of the second oil passage is guided to a position above the third oil passage to a position where the cylinder head is joined to the cam cover. An oil passage for an internal combustion engine, which is configured to be connected to the third oil passage later.