JP3003470B2 - Cam lubrication system for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam lubrication device for an internal combustion engine, and more particularly to a structure of an injection supply unit for injecting lubricating oil from above a cam toward the cam.

[0002]

2. Description of the Related Art In an overhead cam type (OHC) internal combustion engine, as a cam lubricating apparatus for lubricating a cam follower surface of a cam by injecting lubricating oil from above the cam toward the cam, a conventional cam lubricating apparatus has been known. 5 and 6 (see, for example, Japanese Utility Model Laid-Open No. 2-37204).

That is, a camshaft 2 provided with a cam 1
Are rotatably supported by the cam bracket 3. The cam bracket 3 is fastened to a cylinder head (not shown) by bolts 4 inserted through the cam bracket 3 from the upper side of the cam bracket 3. A passage component 6 provided with a passage 6a communicating with an oil supply passage 5 around the bolt 4 formed in the cam bracket 3, and a cavity 7b communicating with the passage 6a via an introduction hole 7a are provided inside. A pipe 7 having an injection hole 7c for injecting lubricating oil from above the cam 1 toward the cam 1 in communication with the cavity 7b. Yes,
The passage forming member 6 of the lubricating oil supply 8 is interposed on the fastening surface between the head 4a of the bolt 4 and the cam bracket 3, and is fastened together with the cylinder head by the bolt 4.

A washer (packing) 9 is interposed between a fastening surface between the bolt head 4a and the passage member 6 and a fastening surface between the passage member 6 and the upper surface of the cam bracket 3, respectively.

[0005]

However, in such a conventional cam lubrication apparatus, the washer 9 is provided on the fastening surface between the bolt head 4a and the cam bracket 3 as described above.
It is necessary to mount the lubricating oil supply body 8 separately from the above, which increases the number of parts, and requires a lot of labor for assembling, resulting in an increase in manufacturing cost.

In view of the above-mentioned conventional problems, the present invention has an integral structure in which a washer itself is provided with an injection supply section for injecting lubricating oil from above a cam toward the cam, thereby reducing the number of parts. It is an object of the present invention to reduce the assembly work and the manufacturing cost.

[0007]

According to the first aspect of the present invention, a cam bracket for rotatably supporting a cam shaft provided with a cam is provided by a bolt inserted through the cam bracket from the upper side of the cam bracket. In the internal combustion engine fastened to the cylinder head, there is provided an insertion hole for the bolt, and a washer interposed on the fastening surface between the bolt head and the cam bracket communicates with the oil supply passage on the cam bracket side. Open to the outer surface of the washer peripheral wall by communicating with the bolt insertion hole.
The injection hole for lubricating oil to be provided is provided while the injection hole is a cam.
A positioning structure for positioning the washer so as to direct the washer is provided.

According to a second aspect of the present invention, there is provided an internal combustion engine wherein a cam bracket for rotatably supporting a cam shaft provided with a cam is fastened to a cylinder head from a top surface of the cam bracket by a bolt inserted through the cam bracket. The engine has an insertion hole for the bolt, and
The camb of a washer interposed on a fastening surface with the cam bracket
Supply the cam bracket side to the contact surface with the racket
Outside the surrounding wall of the washer communicating with the bolt insertion hole communicating with the oil passage
A groove extending to the surface, while the groove directs the cam
A positioning structure for positioning the washer is provided.
In the invention of claim 3, as the positioning structure,
A taper surface for positioning is formed on a contact surface between the side surfaces of a part of the peripheral wall of the washer and the upper surface of the cam bracket which extend in the vertical direction in a continuous manner.

According to the invention of claim 4, the positioning is performed.
As a structure, a fitting portion between the projection for positioning and the recess is formed on the contact surface between the washer and the upper surface of the cam bracket.

[0010]

According to the first aspect of the invention, the lubricating oil from the oil supply passage on the cam bracket side passes through the passage between the inner peripheral surface of the bolt insertion hole and the outer peripheral surface of the bolt and opens to the outer peripheral surface of the washer.
To the injection hole. The washer is positioned by its positioning hole.
Are positioned so that they face the cam, and the lubricating oil is
The fuel is injected from the injection hole toward the cam accurately to lubricate the cam follower surface of the cam. According to the second aspect of the invention,
Lubricating oil from the oil supply passage on the cam bracket side should be
The washer passes through the passage between the inner peripheral surface of the through hole and the outer peripheral surface of the bolt.
Formed on the contact surface with the top of the cam bracket, and
The groove extends to the outer surface of the peripheral wall of the washer in communication with the through hole.
The washer is positioned by the positioning structure so that the groove faces the cam.
Lubricating oil flows from the groove toward the cam.
It is injected precisely to lubricate the cam follower surface of the cam.
According to the first aspect of the present invention, the washer communicates with the bolt insertion hole communicating with the oil supply passage on the cam bracket side.
Lubricating oil injection holes that open on the outer surface of the
Because it was Unishi, or, according to the second aspect of the present invention, the washer
Of the cam bracket on the contact surface with the upper surface of the cam bracket.
Washer communicating with the bolt insertion hole communicating with the oil supply passage on the
Since the concave groove extending to the outer surface of the peripheral wall is provided, it is not necessary to mount the lubricating oil supply body separate from the washer on the fastening surface between the bolt head and the cam bracket.

According to the third aspect of the present invention, when the washer is set on the cam bracket, if both the tapered surfaces are brought into contact with each other,
Alternatively, according to the fourth aspect of the present invention, if the projection and the recess are fitted to each other, the washer is positioned so that the injection hole or the groove is directed to the cam, and the injection hole or the groove is positioned. Pointing cam
And the washer can be prevented from being assembled upside down, and the washer is prevented from rotating.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. 1 and 2, a camshaft 2 provided with a cam 1 is rotatably supported by a cam bracket 3.
The cam bracket 3 is fastened to the cylinder head by a bolt 4 passing through the cam bracket 3 from the upper surface side of the cam bracket 3, and the configuration in which the oil passage 5 is formed around the bolt 4 is the same as the conventional one. .

The configuration different from the conventional one is as follows. That is, a substantially annular washer 10 is interposed on the fastening surface between the bolt head 4a and the cam bracket 3. The central axis of the washer 10 is a bolt insertion hole 1 through which the bolt 4 is inserted.
0a is formed, and the bolt insertion hole 10a is configured as a passage communicating with an oil supply passage 5 formed in the cam bracket 3. The bolt is inserted through the washer 10.
The fluid which is communicated with the hole 10a and opens on the outer peripheral surface of the washer 10
A lubricating oil injection hole 10b is provided.

The washer 10 is connected to the bolt head 4a.
If it interposed attached to the fastening surface of the cam bracket 3 and, injection
A positioning structure for positioning the washer 10 so that the injection hole 10b is directed to the cam 1 is configured as follows. That is, a tapered surface A is formed on a part of the outer peripheral surface of the washer 10 such that the width of the washer in the direction perpendicular to the axis increases from the lower portion to the upper portion. Further, a tapered surface B that matches the tapered surface A is formed on a side surface that extends in the vertical direction in connection with the upper surface of the cam bracket 3.

Therefore, when the washer 10 is set on the upper surface of the cam bracket 3 and the tapered surfaces A and B of the both are matched, the washer 10 is positioned and the injection hole 10b is positioned at a predetermined position facing the cam 1. At the same time, the washer 10 can be prevented from being reversely assembled and the washer 10 is prevented from rotating. In such a configuration, lubricating oil from the oil supply passage 5 formed in the cam bracket 3 is supplied to the bolt insertion hole 1.
Through the gap C between the inner peripheral surface of the bolt 0a and the outer peripheral surface of the bolt 4, it reaches the injection hole 10b, and is injected from the injection hole 10b toward the cam 1 to lubricate the cam follower surface of the cam 1.

According to the above construction, the washer 10 is provided with the bolt insertion hole 10 communicating with the oil supply passage 5 on the cam bracket 3 side.
a and a lubricating oil injection hole 10b communicating with the
Position washer 10 so that hole 10b points to cam 1.
As a result, it is not necessary to interpose a lubricating oil supply body separate from the washer 10 on the fastening surface between the bolt head 4a and the cam bracket 3, thereby reducing the number of parts. , The assembling work can be simplified, and the manufacturing cost can be reduced.

Further, since the washer 10 is merely provided with the injection hole 10b in addition to the bolt insertion hole 10a which is normally provided, no trouble is required in manufacturing the washer 10. Next, another embodiment of the present invention will be described with reference to FIG . In this embodiment, the upper surface of the cam bracket 3 of the washer 11 is
Is in communication with the oil supply passage 5 on the cam bracket 3 side.
Outer surface of the washer 11 in communication with the bolt insertion hole 11a
A concave groove 11b extending to the end is provided.

That is, a semicircular groove 11c is formed on the upper surface of the cam bracket 3 from the periphery of the opening of the oil supply passage 5 toward the edge of the upper surface, and the concave groove 11c is formed on the bottom of the washer 11. A matching semicircular groove 11d is formed, and when the washer 11 is set on the upper surface of the cam bracket 3, the two grooves 11c and 11d are combined to form a circular groove.
11b is formed. Here, this fruit
In the embodiment, the concave groove 11b is directed to the cam 1.
The positioning structure for positioning the washer 11
As in the embodiment, a part of the outer surface of the washer 11
The width of the washer 11 in the direction perpendicular to the axis increases from top to bottom.
Is formed, and the cam bracket 3
The side surface extending in the vertical direction connected to the upper surface of the
A tapered surface B matching the surface A is formed.

The injection hole 10b shown in FIG.
Structure and figure for positioning washer 10 so that
The washer 11 is positioned so that the third groove 11b is directed toward the cam 1.
Washers and cam brackets as positioning structures
Fitting of positioning projections and recesses on the contact surfaces of the upper surfaces
A part may be formed. FIG. 4 shows such a positioning.
So that the injection holes 12b face the cam 1.
FIG. 3 shows a positioning structure for positioning the washer 12, in which a fitting portion between a positioning protrusion 12 a and a recess 3 a is formed between the abutting surfaces of the washer 12 and the upper surface of the cam bracket 3. . That is, a concave portion 3 a is formed on the upper surface of the cam bracket 3, and a protrusion 12 a that matches the concave portion 3 a is formed on the bottom surface of the washer 12. When the washer 12 is set on the upper surface of the cam bracket 3, the protrusion is formed. 12a
By fitting the washer 11 into the recess 3a, the washer 11 is positioned, the injection hole 12b is set at a predetermined position facing the cam 1, the washer 12 can be prevented from being assembled upside down, and the washer 12 A detent is made.

A projection is provided on the cam bracket 3 side,
The recess may be provided on the washer 12 side. As described above, the present invention has been described with reference to the specific embodiments. However, the present invention is not limited to these embodiments. It should be noted that various changes and modifications can be made without departing from the scope.

[0021]

As described above, according to the cam lubrication device for an internal combustion engine of the first aspect of the present invention, a bolt insertion hole is provided.
And is provided on the fastening surface between the bolt head and the cam bracket.
To the washer that communicates with the oil passage on the cam bracket side.
Lubricating oil that opens to the outer peripheral surface of the washer in communication with the
So that the injection hole faces the cam.
According to the cam lubrication device for an internal combustion engine according to the second aspect of the present invention, the positioning structure for positioning the washer is provided, or the contacting surface of the washer with the upper surface of the cam bracket is provided.
Bolt insertion hole communicating with the oil supply passage on the cam bracket side
A groove extending to the outer peripheral surface of the washer in communication with the
Position the washer so that the groove points to the cam.
Since the arrangement structure is provided, lubricating oil is injected into the injection hole or
Or can be precisely injected from the groove to the cam
Effectively lubricates the follower surface and eliminates the need to install a lubricating oil supply separate from the washer on the fastening surface between the bolt head and the cam bracket, reducing the number of parts and improving workability. And production cost can be reduced.

In particular, the positioning structure described above
As the third invention, by forming the tapered surface of the positioning part and abutment surface sides mutually extending longitudinally and connected with the upper surface of the cam bracket of the peripheral wall outer surface of the washer, or claim
As in the invention of the fourth aspect, by forming a fitting portion between the washer and the concave portion on the contact surface between the washer and the upper surface of the cam bracket, the injection hole or the concave groove can be surely positioned at a predetermined position facing the cam. In addition to the setting, there is an advantage that the washer can be prevented from being reversely assembled and the washer is prevented from rotating.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a cam lubrication device for an internal combustion engine according to the present invention, wherein (A) is a front view and (B) is a plan view thereof.

FIG. 2 is a perspective view of the embodiment.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a perspective view of still another embodiment.

FIG. 5 is a front view showing an example of a conventional cam lubrication device.

FIG. 6 is a perspective view of the conventional example.

[Explanation of symbols]

Reference Signs List 1 cam 2 camshaft 3 cam bracket 3a recess 4 bolt 4a bolt head 10 washer 10a bolt insertion hole 10b injection hole 11 washer 11a bolt insertion hole 11b concave groove 11c concave groove 11d concave groove 12 washer 12a protrusion A taper surface B taper surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01M 9/10 F01L 1/04 F01M 1/06 F01M 1/08

Claims (4)

(57) [Claims] 1. An internal combustion engine comprising: a cam bracket rotatably supporting a camshaft provided with a cam fastened to a cylinder head by a bolt inserted through the cam bracket from an upper surface of the cam bracket; It has, on the washer interposed fastening surface between the bolt head and the cam brackets, through the bolt insertion hole and the communication of the oil supply passage communicating with said cam bracket side washer
While providing a lubricating oil injection hole opening on the outer peripheral surface of the peripheral wall, and positioning the washer so that the injection hole faces the cam.
A cam lubrication device for an internal combustion engine, comprising a positioning structure . 2. An internal combustion engine comprising: a cam bracket rotatably supporting a camshaft provided with a cam, which is fastened to a cylinder head by a bolt inserted from the upper surface of the cam bracket to the cylinder head. Having a bolt head and a cam bracket
On the cam bracket of the washer interposed on the fastening surface with the slot
The contact surface with the oil supply passage on the cam bracket side
It extends to the outer surface of the surrounding wall of the washer in communication with the bolt insertion hole
While positioning the washer so that the groove faces the cam.
A cam lubrication device for an internal combustion engine, comprising a positioning structure . 3. The positioning structure according to claim 1 , wherein a tapered surface for positioning is formed on a contact surface between a part of a peripheral wall outer surface of the washer and an upper surface of the cam bracket and a side surface extending in a vertical direction. The cam lubrication device for an internal combustion engine according to claim 1 or 2, wherein: 4. The internal combustion engine according to claim 1 , wherein said positioning structure has a fitting portion between a positioning projection and a recess formed on an abutting surface between said washer and an upper surface of the cam bracket. Engine cam lubrication device.