JP3500314B2 - Rocker arm lubrication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm lubricating device applied to an overhead valve engine, and more particularly to a technique for enhancing lubricating performance with a simple structure.

[0002]

2. Description of the Related Art As a valve mechanism of an overhead valve engine, there has been a push rod type valve mechanism shown in FIG. 8 (A), and in this case, a rocker arm lubricating device of a droplet lubricating type has been adopted. ing. That is, as shown in FIG. 8 (A), this lubricating device is provided with a tilt type overhead valve engine E.
A pair of left and right rocker arms 1 in the rocker arm chamber 20a
3 and 13 are arranged side by side, and a communication hole 35 for the oil mist is vertically formed from the cylinder block 19 to the cylinder head 14. As shown in FIG. 8B, the upper end opening 35b of the communication hole 35 is located inside the rocker arm chamber 20a. The rocker arms 13 and 13 are lubricated by the oil mist introduced into the rocker arm chamber 20a from the crank chamber 42a through the communication hole 35 while being offset to the vicinity of the right side corner on the slope upper side of the rocker arm chamber 20a and the breather. The lubricating oil separated by the device 50 is configured to flow back from the push rod chamber 22 into the crank chamber 42a via the return oil passages 7 and 8.

The upper end opening 35b of the oil mist communication hole 35 is eccentric to the vicinity of the corner on the inclined upper hand side in the rocker arm chamber 20a because the return oil passage 22 for returning the separated lubricating oil is While maintaining 7/8, the communication hole 35, which is formed separately, allows the cylinder bore and intake / exhaust port 1
2 or to avoid interference with the insertion hole 21a of the ignition plug 21. Here, FIG.
Reference numerals 5 and 6 in (A) and (B) are intake and exhaust valves, 9 is a valve camshaft, 10 is a tappet, 11 is a push rod, 11a is an insertion hole of the push rod 11, and 15a and 16a are intake and exhaust valve shafts. , And the insertion hole of each is shown.

[0004]

However, in the above-mentioned prior art, since the upper end opening 35b of the communication hole 35 is deviated to the vicinity of the right corner on the inclined upper hand side in the rocker arm chamber 20a, the rocker arm on the left side is displaced. Lubrication performance decreases. On the other hand, it is conceivable to supply the lubricating oil to the valve operating mechanism in the rocker arm chamber via the pressure-feeding oil passage, but this increases the cost. The present invention has been made in consideration of such circumstances, and it is an object of the present invention to provide a rocker arm lubrication device that can be implemented at low cost by simple modification and that can maintain high lubrication performance even when the pivotal support portion and the bearing boss portion of the rocker arm are long. And

[0005]

The invention described in claim 1 has the following basic configuration. That is, the overhead valve engine E
A pair of left and right rocker arms 1 in the rocker arm chamber 20a
3 and 13 are arranged side by side, a communication hole 35 for the oil mist is vertically formed from the cylinder block 19 to the cylinder head 14, and the upper end opening 35b of the communication hole 35 is displaced to either the left or right in the rocker arm chamber 20a. Chamber 42
The rocker arms 13 and 13 are lubricated by an oil mist introduced from a through the communication hole 35 into the rocker arm chamber 20a.

The invention described in claim 1 is to solve the above-mentioned problems, and in a rocker arm lubricating device having the above-mentioned basic configuration, the flow of the oil mist 44 is made to face the upper end opening 35b of the communication hole 35. A guide 30 for laterally orienting the other side is provided [see FIGS. 1 (A) and 1 (B)],

The upper end opening 35b of the communication hole 35 is offset to the vicinity of either the right or left corner of the tilting overhead side of the rocker arm chamber 20a of the tilt-type overhead valve engine E so that the tilting overhead side of the rocker arm chamber 20a is located near the tilting side. Two pairs of bearing bosses 36 and 37 are provided on the lower inclined side, and these bearing bosses 3
The pivotally supporting portions 13a of the rocker arms 13 are arranged between 6 and 37 and are supported by the supporting shafts 38, respectively, and the oil guides 41a having a narrowed lower inclined side are formed on the upper surfaces of the bearing bosses 36 on the upper inclined side. It is characterized by being formed [see FIG. 1 (A) to FIG. 3].

[0008] The invention as set forth in claim 2, in the lubricating device of the rocker arm according to claim 1, the inclined upstream side end portion of the respective pivot portions 13a, the oil guide 41a
The oil inlet 43a is formed so as to oppose to [see FIG. 1 (A) and FIG. 4 (A) (B)].

According to a third aspect of the present invention, in the rocker arm lubricating device according to the second aspect , the diameter of the axially intermediate portion of each of the support shafts 38 is made smaller, and the pivotal support portion 13a of each of the rocker arms 13 is provided. It is characterized in that an oil reservoir 38b is formed therein (see FIG. 1 (A) and FIG. 2 (B)).

The invention described in claim 4 is the invention according to claim 1.
The lubricating device for rocker arms according to any one of claims 3 to 3 , wherein an oil receiver (47) is formed along the longitudinal direction on the upper surface of the intermediate portion of the pivotal support part (13a) of each rocker arm (13), and the inclined lower part of the oil receiver (47) is lowered. An oil introducing hole 48 communicating with the inside of the pivotally supporting portion 13a is formed at the side end portion (FIGS. 1A and 4).
(See (A)].

[0011]

According to the present invention, the following operational effects are exhibited. (A) In the invention described in claim 1, in the rocker arm lubrication device having the above-described basic structure, the guide 30 is provided so as to face the upper end opening 35b of the communication hole 35 and laterally direct the flow of the oil mist. Therefore, the oil mist sufficiently falls on the rocker arm on the side far from the upper end opening 35b of the communication hole 35, and the lubrication performance of the rocker arm on the other side, which has been insufficient in the past, can be maintained high. Further, since it suffices to provide the guide 30 for directing the flow of the oil mist laterally to the other side so as to face the upper end opening 35b of the communication hole 35, simple modification can be carried out at low cost.

(B) In the invention described in claim 1 , the upper end opening 35b of the communication hole 35 is formed in the inclined overhead valve engine E.
The rocker arm chamber is displaced to the left or right corner near portion of the inclined upper side of the 20a, the oil guide 41a forming the upper surface inclined toward the right hand side is Subomari shape of each bearing boss portion 36 of the inclined upper side of the rocker arm chamber 20a Since the upper end opening 35b of the communication hole 35 is formed, the rocker arm chamber 2
The oil mist introduced into the inside 0a also flows down onto the upper surface of each bearing boss portion 36 on the inclined upper side, and the oil is collected by the oil guide 41a having a shape narrowed on the inclined lower side, and each rocker arm located on the inclined lower side. Lubricate the 13 pivots 13a. As a result, compared with the case where the lubricating oil is supplied to the valve operating mechanism in the rocker arm chamber via the pressure-feeding oil passage, the lubricating oil can be implemented easily and inexpensively, and the lubricating performance can be maintained high even when the rocker arm has a long pivotal support.

[0013] (c) In the invention according to claim 2, wherein
In the rocker arm lubrication device described in Item 1 , the oil introduction port 4 facing the oil guide 41a is provided at the inclined upper hand side end of the pivotally supporting portion 13a of each rocker arm 13.
Since 3a is formed, the oil collected by the oil guide 41a is introduced into the pivot support portion 13a through the oil introduction port 43a facing the oil guide 41a, and the pivot support portion 13a can be more reliably lubricated. .

[0014] (d) In the invention according to claim 3, wherein
In the rocker arm lubrication device according to item 2 , the diameter of the axially intermediate portion of each support shaft 38 of the rocker arm 13 is reduced to form the oil reservoir 38b in the pivotal support portion 13a of each rocker arm 13. The oil introduced from the oil introduction port 43a into the pivot 13a is stored in the oil reservoir 38b formed in the pivot 13a, and the pivot 13a can be lubricated more effectively.

[0015] (e) In the invention according to claim 4, wherein
The rocker arm lubricating device according to any one of claims 1 to 3 , wherein the pivotal support portion 1 of each rocker arm 13 is provided.
An oil receiver 47 is formed along the longitudinal direction on the upper surface of the intermediate portion of 3a, and an oil introduction hole 48 communicating with the pivotal support portion 13a is formed at the inclined lower side end of the oil receiver 47. The oil that has fallen onto the upper surface of the intermediate portion of the support portion 13a is collected by the oil receiver 47 and flows into the pivot support portion 13a through the oil introduction hole 48 at the lower end on the inclined side. As a result, the oil flowing into the pivotally supporting portion 13a can more effectively lubricate the pivotally supporting portion 13a formed in the longitudinal direction.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a vertical sectional front view of an air-cooled single-cylinder tilt type overhead valve engine to which the present invention is applied. First, an outline of this tilt type overhead valve engine will be briefly described. As shown in FIG. 7, the tilt type overhead valve engine E has a crankcase 42 and a cylinder block 19 which are integrally formed, the cylinder head 14 is assembled on the cylinder block 19, and the cylinder head 14 has a double structure. The head cover 20 is assembled and configured. The crankshaft 23 is installed in the crank chamber 42a on the inclined upper side, and the valve camshaft 9 is installed on the inclined lower side in parallel with each other. The valve cam gear 26 is meshed with the first drive gear 34. The second drive gear 60 is configured to mesh the balancer gear 27 and the governor gear 28, and the crankshaft 23 drives the valve operating camshaft 9 and the governor 32.

FIG. 1A is a plan view of the cylinder head according to the embodiment of the present invention as seen from the upper side of the inclined side, and FIG. 6 is a sectional view taken along the line AA in FIG. As shown in FIGS. 1 (A), 6 and 7, the valve cam shaft 9, the pair of left and right tappets 10 and the push rods 11 and 11 are arranged on the lower inclined side of the cylinder block 19, and the rocker arm is provided. 13 and 13 are arranged side by side in the rocker arm chamber 20a. Further, as shown in FIG. 7, the governor 32 is arranged on the inclined upper hand side in the crank chamber 42a.

2A is a vertical sectional view taken along the line aa in FIG. 1A, and FIG. 2B is a vertical sectional view taken along the line bb in FIG. 1A. . As shown in FIG.
As shown in (A) and FIG. 6, a pentroof type combustion chamber 1
7, a pair of left and right intake valve openings 3 and exhaust valve openings 4 are opened on the surface of the cylinder head 14 facing the combustion chamber.
The intake port 1 and the exhaust port 2 are led out to the right and left from the intake valve port 3 and the exhaust valve port 4, respectively. Further, one intake valve 5 and one exhaust valve 6 are provided on the left and right sides facing the combustion chamber 17, and their intake and exhaust valve shafts 15 and 16 are arranged in a V-shape. Further, the output portions 13c of the left and right rocker arms 13 are brought into contact with the upper ends of the left and right intake / exhaust valve shafts 15 and 16, and the input portions 13b of the respective rocker arms 13 are brought into contact with the respective upper end portions of the left and right push rods 11. There is. The intake and exhaust valves 5 and 6 are biased toward the valve closing side by valve springs 31 and 31.

FIG. 3 shows the cylinder head 14 shown in FIG.
1 is a view corresponding to FIG. 1 (A) showing a state in which a rocker arm 13, a spark plug 21 and the like are removed. FIG. 1A and FIG.
Further, as shown in FIG. 7, an insertion port 21a of the ignition plug 21 is opened at an intermediate position between the intake valve port 3 and the exhaust valve port 4 on the inclined upper hand side of the cylinder head 14. The spark plug 21 is inserted into the insertion port 21a, and the electrode portion thereof is arranged so as to face the center of the combustion chamber 17. On the right side of the inclined side of the cylinder block 19 and the cylinder head 14, a communication hole 3 for an oil mist that communicates the crank chamber 42a and the rocker arm chamber 20a, as in the conventional example.
5 is formed longitudinally.

The characteristic features of the present invention will be specifically described below. FIG. 1B is a vertical cross-sectional view taken along the line AA in FIG. As shown in FIGS. 1 (A), (B) and FIG. 3, the upper end opening 35b of the communication hole 35 is eccentrically located in the rocker arm chamber 20a in the vicinity of the corner on the right side of the slope,
A guide 30 which faces the upper end opening 35b and directs the flow of the oil mist 44 laterally to the left is formed integrally with the cylinder head 14 as a mold. This is the crank chamber 4
The oil mist introduced from 2a into the rocker arm chamber 20a effectively drops into the rocker arm 13 on the left side far from the upper end opening 35b of the communication hole 35, so that the lubrication performance of the rocker arm on the other side, which has been insufficient in the past, can be maintained high. It was intended. Further, the guide 30 has the communication hole 3
5, it is only necessary to face the upper end opening 35b of 5,
It can be implemented at low cost with simple modification.

FIG. 4 shows a rocker arm according to the present invention,
4A is a plan view of the rocker arm, FIG. 4B is a left front view of the rocker arm, and FIG. 4C is a right front view of the rocker arm. Each rocker arm 13 is shown in FIG.
As shown in (A) and FIGS. 4 (A) to 4 (C), the trunk portion 13a of the trunk length and the center line (bb line) of FIG. 1 (A) from the axially intermediate portion of the trunk portion 13a. The input portion 13b extending upward and the input portion 13b from the other end of the pivotally supporting portion 13a.
And a pair of left and right bearing boss portions 36, 37, 36.
37 is configured to pivotally support the pivot portions 13a and 13a, respectively.

As shown in FIGS. 1 (A), 2 (A) (B) and FIG. 3, a pair of left and right bearing boss portions 36, 36 are provided on the inclined upper hand side in the rocker arm chamber 20a. A pair of left and right bearing bosses 37, 37 (a total of two pairs of bearing bosses 36, 37) are provided on the side of the cylinder head 14 respectively.
The bearing bosses 36 and 37 are formed integrally with
The pivotally supporting portions 13a of the rocker arms 13 are arranged between them and are supported by the supporting shafts 38, respectively.

As shown in FIGS. 1A and 1B and FIG. 2, ribs 41, 41 forming a pair project from the upper surface of each bearing boss 36 on the inclined upper side, and the inclined lower side is formed between them. An oil guide 41a having a constricted shape is formed. On the other hand, as shown in FIG. 1 (A) and FIG. 4 (A) (B), a U-shaped rib 43 is provided at the end of the tilted upper hand side of the pivotally supporting portion 13a of each rocker arm 13 so as to project therefrom. An oil introduction port 43a is formed inside the oil guide 41a so as to face the oil guide 41a. Further, as shown in FIG. 4C, an oil lead-out port 43b is formed at an end on the inclined lower side of the pivotally supporting portion 13a of each rocker arm 13.

According to the above construction, the rocker arm chamber 20a
The oil mist introduced into the inside also flows down onto the upper surface of each bearing boss portion 36 on the inclined upper hand side, and the oil is collected by the oil guide 41a having a constricted lower inclined side, and the oil introduction port 43a facing the oil guide 41a. Further, it is introduced into the pivot 13a and lubricates the pivot 13a.
As a result, the lubricating performance can be maintained high even when the pivotally supporting portion 13a of the rocker arm 13 has a long body shape.

Further, the pivotal support 13 of each rocker arm 13
An oil receiver 47 is formed along the longitudinal direction in the upper surface of the intermediate portion of a, and an oil introduction hole 48 communicating with the pivotal support portion 13a is formed at an inclined lower end of the oil receiver 47. This is because the oil that has fallen onto the upper surface of the intermediate portion of the pivot 13a is collected by the oil receiver 47 and flows into the pivot 13a through the oil introduction hole 48, so that the pivot 13a formed by the oil in the longitudinal direction is further improved. It is intended to be effectively lubricated.

As shown in FIGS. 1 (A) and 2 (B), each of the support shafts 38 of the rocker arms 13 has a small diameter in the axial middle portion thereof, and each of the support shafts 13a of each rocker arm 13 has a small diameter. It is configured to form an oil sump 38b therein. This is the oil inlet 43a and the oil inlet 4
It is intended that the oil introduced from No. 8 into the pivotally supporting portion 13a is stored in the oil sump 38b to more reliably lubricate the inside of the pivotally supporting portion 13a. Further, the reason why the oil outlet 43b is provided at the end on the lower inclined side of the pivot 13a is intended to replace the oil in the oil reservoir 38b with the passage of time. As shown in FIG. 2 (B), a retaining ring 39 is attached to one end portion of the support shaft 38 on the inclined upper hand side to prevent the support shaft 38 from falling off by its own weight.

A pair of bearing bosses 36, 36 on the inclined upper hand side
As shown in FIG. 2A, the left and right valve spring receiving seats 3
The intake and exhaust valve shafts 15 and 16 are arranged close to the
Is formed to have a V-shape in a state of being aligned with, and is integrally provided with the bottom wall portion 18 on the inclined upper side in the rocker arm chamber 20a. In this state, each bearing boss portion 3 in plan view
6 seems to interfere with the seat 33 of the valve spring 31,
Since the valve shafts 15 and 16 are also arranged in a V shape, the bearing boss portions 36 and the valve spring 31 do not interfere with each other. The reason why the pair of bearing boss portions 36, 36 are formed in a V-shape in this way is intended to make the cylinder head 14 and the head cover 20 compact.

On the other hand, each bearing boss 37.3 on the lower inclined side
7 also projects integrally with the left and right bottom wall portions 24, 24 on the inclined lower side in the rocker arm chamber 20a. This is intended to suppress the cost increase as compared with the case where each bearing boss portion is provided separately. Further, as shown in FIGS. 2B and 3, a tilted return groove 25 for lubricating oil is formed between the left and right bottom wall portions 24, 24. This is intended to prevent the lubricating oil from accumulating in the bottom wall portion 24 and return the oil into the crank chamber 42a.

The lower end of the inclined return groove 25 is connected to a lower bottom wall portion 45 formed in a paragraph shape in the rocker arm chamber 20a, and the lower bottom wall portion 45 is pushed to the lower bottom wall portion 45 as shown in FIG. The insertion holes 11a, 11a of the rod 11 are opened, and the inclined lower side portion 11b of each insertion hole 11a is
It extends to the peripheral edge on the lower inclined side of the lower bottom wall portion 45.
As a result, the lubricating oil dropped on the bottom wall portion 24 on the lower inclined side returns from the inclined return groove 25 to the inside of the crank chamber 42a via the lower inclined side portion 11b of the insertion hole 11a of the push rod 11.

FIG. 5 shows a breather device provided in the head cover in FIGS. 7 and 6, FIG. 5 (A) is a plan view of the inner cover, and FIG. 5 (B) is B in FIG. 5 (A). -B line arrow sectional drawing, FIG.5 (C) is CC sectional arrow sectional view in FIG.5 (B). In this embodiment, as shown in FIGS. 6 and 7,
The outer cover 20A and the inner cover 20B constitute a double-structured head cover 20. Then, the breather device 50, as shown in FIGS.
The oil separating plate 51 is provided on the inner surface on the inclined upper side of 0B, and the reed valve 56 and the valve regulating plate 57 are crimped to the inner cover 20B with rivets 58a, 58a, 58b, respectively, while facing the breather inlet 55 from the outside. Breather inlet 5 from rocker arm chamber 20a including a large amount of mist
It is configured to separate the oil from the blow-by gas passing through 5 to the purifying chamber 20b. In addition, air purification room 2
The separated oil of 0b returns to the inside of the rocker arm chamber 20a through the return hole 59 formed on the inclined lower side of the inner cover 20B.

The oil separating plate 51 has a horizontally long oil receiving portion 52 and a baffle plate 5 which faces the breather inlet 55 from the inside.
4 and. The oil receiving portion 52 has left and right cutouts 53, 53 formed at predetermined intervals. The cutouts 53, 53 are formed on the bearing bosses 36, 36 of the left and right rocker arms 13, 13 and are provided with an oil guide 41a.・ 4
It faces the upper side of 1a. This is the rocker arm room 20
The oil separated in the oil a is guided from the cutouts 53, 53 of the oil receiving portion 52 to the oil guides 41a, 41a.
It is intended that the left and right rocker arms 13, 13 are more effectively lubricated by being dropped on a.

In the above embodiment, the tilted type overhead valve engine is exemplified, but the invention described in claim 1 can be widely applied to the overhead valve engine. In the above embodiment, the upper end opening 35b of the communication hole 35 is arranged in the rocker arm chamber 20a in the vicinity of the corner on the right hand side of the slope. However, in the invention described in claim 2, the upper end opening 35b is Rocker arm chamber 20a
Any one can be applied as long as it is arranged in the vicinity of one of the left and right corners on the inner side of the inclined side.

[Brief description of drawings]

FIG. 1 shows a cylinder head according to an embodiment of the present invention, FIG. 1 (A) is a plan view of the cylinder head as seen from an upper side on an inclined side, and FIG. 1 (B) is A- in FIG. 1 (A). It is a vertical cross-sectional view taken along the line A.

2 shows a cylinder head according to an embodiment of the present invention, FIG. 2 (A) is a vertical sectional view taken along the line aa in FIG. 1 (A), and FIG. 2 (B) is FIG. 1 (A). FIG. 7 is a vertical cross-sectional view taken along the line bb of FIG.

FIG. 3 is a view corresponding to FIG. 1 (A) showing a state in which a rocker arm, a spark plug, and the like are removed from the cylinder head in FIG. 1 (A).

FIG. 4 shows a rocker arm according to the present invention, and FIG.
Is a plan view of the rocker arm, FIG. 4B is a left front view of the rocker arm, and FIG. 4C is a right front view of the rocker arm.

5 shows a breather device provided in the head cover in FIGS. 6 and 7, FIG. 5 (A) is a plan view of the inner cover, and FIG. 5 (B) is a plan view of FIG. 5 (A). 5B is a sectional view taken along the line BB, and FIG. 5C is a sectional view taken along the line C-C in FIG. 5B.

6 is a sectional view taken along the line AA in FIG.

FIG. 7 is a vertical sectional front view of an air-cooled single-cylinder tilt type overhead valve engine to which the present invention is applied.

8 shows a conventional example, FIG. 8 (A) is a view corresponding to FIG. 7, and FIG.
(B) is a view corresponding to FIG. 3.

[Explanation of symbols]

1 ... Intake port, 2 ... Exhaust port, 13 ... Rocker arm, 13a ... Pivot part of rocker arm, 14 ... Cylinder head, 19 ... Cylinder block, 20a ... Rocker arm chamber, 30 ... Guide, 35 ... Oil mist communication hole, 35
b ... Upper end opening of communication hole, 36 ... Bearing boss portion on inclined upper side, 37 ... Bearing boss portion on inclined lower side, 38 ... Rocker arm support shaft, 38b ... Oil sump, 41a ... Oil guide, 42a ... Crank chamber, 43a ... Oil inlet, 44
... Oil mist, 47 ... Oil receiver, 48 ... Oil introduction hole, E ... Inclined overhead valve engine.

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Claims (4)

(57) [Claims] 1. A pair of left and right rocker arms (13, 13) in a rocker arm chamber (20a) of an overhead valve engine (E).
Of the oil mist (44) from the cylinder block (19) to the cylinder head (14).
5) is formed longitudinally, and the upper end opening (3) of the communication hole (35) is formed.
5b) is displaced to the left or right in the rocker arm chamber (20a), and the communication hole (3) is extended from the crank chamber (42a).
In the rocker arm lubrication device configured to lubricate the rocker arm (13, 13) with the oil mist (44) introduced into the rocker arm chamber (20a) through the rocker arm chamber (20a), the upper end opening (35b) of the communication hole (35). ),
A guide (30) for directing the flow of the oil mist (44) laterally to the other side is provided, and the upper end opening (35b) of the communication hole (35) is tilted overhead.
Inclination in the rocker arm chamber (20a) of the valve engine (E)
The rocker arm chamber (20a) is tilted in the vicinity of one of the left and right corners on the upper hand side and tilted on the upper hand side and the lower tilted side.
Two pairs of bearing bosses (36, 37) are provided on the hand side.
Between each of the bearing bosses (36, 37) of each rocker arm (1
3) The pivotal support portion (13a) is arranged and the support shafts (3
8), and the tilt is provided on the upper surface of each bearing boss (36) on the upper hand side.
Shape the oil guide (41a) with the lower side constricted
The rocker arm lubrication device is characterized by being made. 2. The rocker arm lubrication device according to claim 1 , wherein an oil inlet port (43a) facing the oil guide (41a) is provided at an inclined upper hand side end portion of each pivotal support portion (13a).
The rocker arm lubrication device is characterized in that. 3. The rocker arm lubrication device according to claim 2 , wherein the diameter of the axially intermediate portion of each of the support shafts (38) is reduced so that the inside of the pivotal support portion (13a) of each of the rocker arms (13). An oil reservoir (38b) is formed in the rocker arm lubrication device. 4. The rocker arm lubrication device according to claim 1 , wherein an oil receiver (47) extending in a longitudinal direction is provided on an upper surface of an intermediate portion of a pivotally supporting portion (13a) of each rocker arm (13). Of the oil receiving hole (47), and an oil introducing hole (4) communicating with the inside of the pivotal support portion (13a) is formed at the end of the inclined lower side of the oil receiver (47).
8) The rocker arm lubrication device characterized by being formed.