JP4486574B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine.

Conventionally, as an internal combustion engine of this type, as disclosed in Patent Document 1, an oil injection port is provided on the upper surface of a cylinder head cover, and a chain wound around a cam sprocket and a crank sprocket is accommodated from the oil injection port. There has been proposed one that supplies oil to an oil pan through a chain chamber.
In this internal combustion engine, a press-processed plate material is attached to the lower part of the oil injection port so that even when the cap for covering the oil injection port is forgotten to be attached, the oil does not scatter from the oil injection port to the outside. .
Japanese Utility Model Publication No. 6-83912

However, in such an internal combustion engine, since the pressed plate material is only cantilevered at the lower part of the oil inlet, it cannot be said that the strength against bending moment due to vibration from the internal combustion engine is sufficient. It was.
In addition, since the plate material is attached to the lower part of the oil inlet, a processing step for forming a mounting seat on the lower surface of the cylinder head cover is required, resulting in a decrease in manufacturability.
Although it is conceivable to provide an oil protector integrally at the lower part of the oil inlet, there is a problem that the castability is deteriorated and the productivity is lowered.

The present invention has been devised in view of the above-described conventional problems, and even when the lid of the injection port is forgotten to be attached while the strength against vibration from the internal combustion engine is ensured, the lubricating oil is discharged from the injection port to the outside. One of the purposes is to prevent scattering.
Further, one of the purposes is to improve the manufacturability, and further one of the purposes is to improve the lubricating oil injection property. Claim 1 can inject lubricating oil from the upper surface of the cylinder head cover. In the internal combustion engine including the lubricating oil injecting device, the lubricating oil injecting device includes an opening portion opened in an upper surface of the cylinder head cover, and the lubricating oil formed in a position offset in the horizontal direction with respect to the opening portion. And a cover means for covering the opening having an inlet for injection and an introduction path for introducing the lubricating oil injected from the inlet into the opening.

  According to a second aspect of the present invention, the opening is formed on the upper surface of the cylinder head cover corresponding to the upper part of the chain chamber.

  A third aspect of the present invention is that the covering means is means for forming the introduction path between the upper surface of the cylinder head cover by covering the opening.

  According to a fourth aspect of the present invention, the cover means is a means formed separately from the cylinder head cover and fastened and fixed to the cylinder head cover by a fastening means.

  According to a fifth aspect of the present invention, the introduction path is formed to be inclined downward from the injection port toward the opening.

  According to a sixth aspect of the present invention, the opening is formed on a rotation direction side with respect to a vertical direction passing through a rotation center of a cam sprocket disposed in the chain chamber.

  Further, according to a seventh aspect of the present invention, in the internal combustion engine according to any one of the first to fifth aspects, the cylinder cover direction is perpendicular to the longitudinal direction of the vehicle. It is a means which covers the said opening part so that it may be located in the front side of the said vehicle.

The present invention provides an internal combustion engine including a lubricating oil injecting device capable of injecting lubricating oil from an upper surface of a cylinder head cover, wherein the lubricating oil injecting device has an opening opened on the upper surface of the cylinder head cover, and the opening. Covering means for covering the opening having an injection port for injecting the lubricating oil formed at a position offset in the horizontal direction and an introduction path for introducing the lubricating oil injected from the injection port into the opening. Since the cylinder head cover only has an opening, the strength against vibration from the internal combustion engine can be sufficiently secured, and the opening and the injection port are offset from each other. Therefore, even if it is forgotten to attach a lid to the injection port, it is possible to prevent the lubricating oil from scattering from the injection port to the outside.
Further, it is not necessary to separately attach a guide member for preventing the lubricant from splashing from the inlet to the lower portion of the inlet, and further, it is not necessary to process the lower surface of the cylinder head cover, thereby improving the productivity. It will be a thing.

  The opening is formed on the upper surface of the cylinder head cover corresponding to the upper part of the chain chamber, so that the lubricating oil injected from the upper surface of the cylinder head cover can be quickly introduced into the oil pan.

  Further, the cover means is a means for forming the introduction path between the upper surface of the cylinder head cover by covering the opening, and thus the introduction path can be easily formed.

  Further, the cover means is formed separately from the cylinder head cover and is fastened and fixed to the cylinder head cover by fastening means, so that the cover means is integrated with the cylinder head cover. As a result, manufacturability, particularly castability, is improved.

  Further, the introduction path is formed so as to be inclined downward from the injection port toward the opening, thereby improving the lubricating oil injection property.

  Further, the opening is formed on the rotation direction side with respect to the vertical direction passing through the rotation center of the cam sprocket disposed in the chain chamber, so that the lubricating oil can be more easily scattered from the inlet to the outside. This can be surely prevented.

  6. The internal combustion engine according to claim 1, wherein the cylinder row direction is arranged so as to be perpendicular to the front-rear direction of the vehicle. By the means for covering the opening so as to be positioned at the position, the workability when injecting the lubricating oil is improved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing an example of an engine 1 as an internal combustion engine provided with a lubricating oil injection device 2 according to an embodiment of the present invention as viewed from above, and FIG. 2 is a line AA in FIG. FIG.
As shown in FIG. 1, the lubricating oil supply device 2 of the embodiment is a cylinder of an engine 1 mounted on a vehicle so that the cylinder row direction of the cylinders 1a, 1b, 1c, 1d is perpendicular to the longitudinal direction of the vehicle. The upper surface 3a of the cylinder head cover 3 covered on the upper surface of the head (not shown) is provided at a position corresponding to the upper side of the chain chamber (not shown), and the lubricated oil is supplied to the chain chamber. It is comprised so that it may supply to an oil pan via.

  As shown in FIG. 2, the lubricating oil supply device 2 of the embodiment has an opening 7 that is vertically formed through the upper surface 3 a of the cylinder head cover 3, a lubricating oil inlet 12, and an opening 7 that is formed on the upper surface. The cover cover member 8 that forms the introduction path 11 that guides the lubricating oil injected from the injection port to the opening 7 and the oiling port lid 10 that covers the injection port 12 are injected from the injection port 12. The lubricating oil is introduced into the chain chamber 4 from the opening 7 through the introduction path 11.

  The opening 7 receives a chain from a crank sprocket (not shown) of the cam sprocket 5 disposed in the chain chamber 4 on the upper surface 3a of the cylinder head cover 3 with respect to the front-rear direction of the vehicle. The cam sprocket 5a is formed at a position corresponding to the cam sprocket 5a that receives a chain from the cam sprocket 5a and the cam sprocket 5a that is in the rotational direction with respect to the vertical direction passing through the rotation center of the cam rocket 5a.

The cover member 8 has a shape in which a lower side having an upper surface 8b is opened on a side peripheral surface 8a integrally formed with a flange portion 8c on the outer periphery of the lower end. A portion 8d is formed, and the injection port 12 is vertically formed through the lid mounting portion 8d.
The inlet 12 is configured to be disposed at a position on the front side of the vehicle in a state in which the cover member 8 is fixedly attached to the upper surface 3a of the cylinder head cover 3 with the mounting bolt 9 via the flange portion 8c. That is, the cover member 8 is arranged so that the inlet 12 is offset from the opening 7 in the longitudinal direction of the vehicle, and the introduction path 11 connecting the inlet 12 and the opening 7 is the upper surface of the cylinder head cover 3. 3a is formed. Here, the upper surface 3 a of the cylinder head cover 3 is formed in a shape inclined downward toward the opening 7 in a portion where the introduction path 11 is formed.

  The oil filler cap 10 is formed with a male screw portion 10a corresponding to the female screw portion 8d ′ formed in the lid attaching portion 8d and a flange portion 10b seated on the lid attaching portion 8d. An oil seal 10c is mounted on the side of the portion 8d so as to prevent the lubricating oil from leaking between the oil filler lid 10 and the lid mounting portion 8d.

Next, the movement of the lubricating oil in the lubricating oil injecting apparatus 2 of the embodiment thus configured will be described.
Lubricating oil poured from the inlet 12 is introduced into the chain chamber 4 from the opening 7 through the introduction path 11, flows through the chain chamber, and is supplied to the oil pan. At this time, since the upper surface 3a of the cylinder head cover 3 is formed in a shape inclined downward toward the opening 7 in the portion where the introduction path 11 is formed, the lubricating oil injected from the injection port 12 flows into the opening 7. It becomes easy and the injection property is improved. Further, since the injection port 12 is arranged on the front side in the front-rear direction of the vehicle, the lubricating oil can be easily injected. Here, the reason why the lubricating oil is supplied to the oil pan through the chain chamber 4 is that the lubricating oil can be quickly supplied to the oil pan.

  Thus, after the lubricating oil is injected, the oil filler lid 10 is attached to the lid attaching portion 8d in order to close the inlet 12, but even if the oil filler lid 10 is forgotten to be attached, the inlet 12 and the opening 7 Are offset in the longitudinal direction of the vehicle, so that the lubricating oil does not scatter from the inlet 12 to the outside. Further, the opening 7 is formed on the upper surface 3a of the cylinder head cover 3 at a position corresponding to a position between the campus rocket 5a and the cam sprocket 5b which are on the rotational direction side with respect to the vertical direction passing through the rotation center of the campus rocket 5a. Therefore, it is possible to satisfactorily prevent the lubricating oil scattered by the rotation of the cam sprocket 5a from flowing into the opening 7.

  According to the lubricating oil injection device 2 of the embodiment described above, the opening 7 and the injection port are formed on the upper surface 3 a of the cylinder head cover 3 and on the upper surface of the opening 7 formed at a position corresponding to the upper part of the chain chamber 4. The cover member 8 is attached so that the position of the inlet 12 is offset in the longitudinal direction of the vehicle, and the introduction path 11 that connects the inlet 12 and the opening 7 is formed on the upper surface 3 a of the cylinder head cover 3. Even if the oil filler lid 10 is forgotten to be attached, the lubricating oil splashed by the cam sprockets 5a and 5b can be prevented from splashing from the inlet 12 to the outside. In addition, since the cylinder head cover 3 is only formed with the opening 7, the strength against vibration from the engine 1 can be sufficiently secured, and the injection port 12 can be used to prevent the lubricating oil from scattering from the injection port 12. Since it is not necessary to separately attach a guide member to the lower part or to process the lower surface of the cylinder head cover 3 in order to attach this guide member, productivity is improved. Moreover, since only the cover member 8 is attached to the upper surface of the opening 7, the productivity is further improved.

  Further, the opening 7 is formed on the upper surface 3a of the cylinder head cover 3 at a position corresponding to a position between the campus rocket 5a and the cam sprocket 5b which are on the rotational direction side with respect to the vertical direction passing through the rotation center of the campus rocket 5a. Therefore, it is possible to satisfactorily prevent the lubricating oil scattered by the rotation of the cam sprocket 5a from flowing into the opening 7.

  Further, since the upper surface 3a of the cylinder head cover 3 is formed in a shape inclined downward toward the opening 7 in the portion where the introduction path 11 is formed, the lubricating oil injected from the injection port 12 easily flows into the opening 7. The injection property is improved. Further, since the injection port 12 is arranged on the front side in the front-rear direction of the vehicle, the lubricating oil can be easily injected.

In the lubricating oil supply device 2 of the embodiment, the separate cover member 8 is fixedly attached to the upper surface of the opening 7 of the cylinder head cover 3 by the mounting bolt 9. It is also possible to provide a cover portion that bulges.
FIG. 3 is an enlarged cross-sectional configuration diagram corresponding to FIG. 2 showing a modification. As shown in the figure, a cover 31 bulging upward integrally is formed on the upper surface 3 a of the cylinder head cover 3. An introduction path 11 is formed in the cover 31, and an injection port 12 is formed at a position offset from the opening 7 formed at the downstream end of the introduction path 11.

  The cover portion 31 is formed integrally with the upper surface 3a of the cylinder head cover 3 by casting, and the introduction path 11 is formed by inserting and fixing a core into the cover portion 31 when the cover portion 31 is formed. Is done. A separate plug 13 is fitted into the hole after the core is removed to close the introduction path 11.

  In the lubricating oil injecting apparatus 2 of the embodiment, the inlet 12 is arranged on the front side in the front-rear direction of the vehicle. However, if the inlet 12 is offset in the horizontal direction, for example, the rear side in the front-rear direction of the vehicle Alternatively, it may be arranged on the left or right side of the vehicle in the left-right direction.

  In the lubricating oil injecting device 2 of the embodiment, the upper surface 3a of the cylinder head cover 3 is formed in a shape inclined downward toward the opening in the portion where the introduction path 11 is formed. It does not matter if it is not formed.

  In the lubricating oil injecting device 2 of the embodiment, the opening 7 is on the upper surface 3a of the cylinder head cover 3 with the campus rocket 5a and the cam sprocket 5b on the rotational direction side with respect to the vertical direction passing through the rotation center of the campus rocket 5a. The opening 7 is formed on the upper surface 3a of the cylinder head cover 3 on the opposite side of the rotation direction side with respect to the vertical direction passing through the rotation center of the campus rocket 5a. The opening 7 is formed on the upper surface 3a of the cylinder head cover 3 at a position corresponding to the rotation direction side with respect to the vertical direction passing through the rotation center of the campus rocket 5b. There is no problem.

  In the lubricating oil supply device 2 of the embodiment, the opening 7 is formed on the upper surface 3a of the cylinder head cover 3 at a position corresponding to the upper side of the chain chamber 4, but a position other than the upper side of the chain chamber 4, For example, you may form in the position corresponding to the upper direction of a valve mechanism mechanism chamber.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

It is the plane lineblock diagram seen from the upper surface side of an internal-combustion engine. FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1. FIG. 3 is an enlarged cross-sectional configuration diagram corresponding to FIG. 2 illustrating a modification example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Lubricating oil injection apparatus 3 Cylinder head cover 3a Upper surface 4 Chain chamber 5a, 5b Cam sprocket 6 Chain 7 Opening part 8 Cover member 8a Side peripheral surface 8b Upper surface 8c Flange part 8d 'Female thread part 9 Mounting bolt 10 Oil supply port cover 10a Male Screw part 10b Flange part 10c Oil seal 11 Inlet path 12 Inlet 13 Plug 31 Covering cover part

Claims (7)

In an internal combustion engine provided with a lubricating oil injection device capable of injecting lubricating oil from the upper surface of a cylinder head cover,
The lubricating oil injection device is:
An opening opened on an upper surface of the cylinder head cover;
The opening having an injection port for injecting the lubricating oil formed at a position offset in a horizontal direction with respect to the opening, and an introduction path for introducing the lubricating oil injected from the injection port into the opening Covering means for covering
An internal combustion engine.   The internal combustion engine according to claim 1, wherein the opening is formed on an upper surface of the cylinder head cover corresponding to an upper part of the chain chamber.   3. The internal combustion engine according to claim 1, wherein the covering means is means for forming the introduction passage between the opening and the cylinder head cover by covering the opening. 4.   The internal combustion engine according to any one of claims 1 to 3, wherein the cover means is a means formed separately from the cylinder head cover and fastened and fixed to the cylinder head cover by fastening means.   The internal combustion engine according to any one of claims 1 to 4, wherein the introduction path is formed to be inclined downward from the inlet toward the opening.   The internal combustion engine according to any one of claims 3 to 5, wherein the opening is formed on a rotation direction side with respect to a vertical direction passing through a rotation center of a cam sprocket disposed in the chain chamber. organ. The internal combustion engine according to any one of claims 1 to 6, wherein the cylinder row direction is arranged so as to be perpendicular to the longitudinal direction of the vehicle.
The internal combustion engine, wherein the cover means is means for covering the opening so that the injection port is located on the front side of the vehicle.

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