JPH09228816A - Lubricating device for four cycle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply lubricant to a lubricated part surely in the case where an engine position is fluctuated by change of working position. SOLUTION: In the case where the lubricating device 20 of a four cycle engine 1 is constituted so as to forcibly supply lubricant to lubricated parts 6a, 6b in an engine 1, a tank 21 for reserving lubricant is arranged, the suction port 27a of a suction pipe 27 is arranged in the reserving tank 21 freely to rotate around a cylinder shaft and a crank shaft, and thereby, the suction port 27a is positioned in lubricant at all times even if the position of lubricant A to A2 in the reserving tank 21 is fluctuated according to the position of the engine 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication device for a four-cycle engine, and more particularly to a structure capable of reliably supplying lubricating oil to a lubricated portion even when the engine posture changes.

[0002]

2. Description of the Related Art For example, as a drive engine for a chain saw, a lawn mower, a mower, etc., a two-cycle engine is generally adopted because of its simple structure and light weight. However, the two-cycle engine has a problem that the amount of CO and HC in the exhaust gas discharged to the atmosphere is large, which is a bottleneck in purifying exhaust gas and environmental protection.

On the other hand, in the case of a 4-cycle engine, CO and H in exhaust gas are higher than those in a 2-cycle engine.
Since the amount of C is small, it is advantageous in avoiding the influence on air pollution. For this reason, recently, the adoption of a 4-cycle engine is also being considered in the above-mentioned chain saw, weed cutting machine and the like.

[0004]

By the way, since the working postures of the above-mentioned chain saws and mowers greatly change depending on their applications, the engine postures also fluctuate greatly back and forth, left and right, or upside down. Becomes

When the engine attitude changes in this way,
Although a 2-cycle engine is not a problem, a 4-cycle engine may not be adopted as it is. In other words, the position of the oil sump in the oil pan may fluctuate significantly due to changes in the engine posture, and the suction port of the suction pipe may move away from the oil surface.In such a case, lubricating oil can be supplied to the lubricated part. The problem of disappearing arises. In addition, depending on the engine posture, lubricating oil may accumulate in the cylinder bore from the back side of the piston, and this accumulated lubricating oil may enter the combustion chamber, resulting in excessive consumption of lubricating oil and possible misfire. It Further, even when the lubricating oil is accumulated in the cam chamber or the valve chamber, the same problems as described above may occur, and countermeasures for these problems are necessary.

The present invention has been made in view of the above circumstances, and it is possible to reliably supply the lubricating oil to the lubricated portion even when the engine posture changes, and avoid the problems of excessive consumption of lubricating oil and misfire. It is an object of the present invention to provide a lubrication device for a 4-cycle engine.

[0007]

According to a first aspect of the present invention, there is provided a reservoir for storing lubricating oil in a lubrication device for a four-cycle engine in which lubrication is forcibly supplied to a portion to be lubricated, and a suction port is provided in the reservoir. Is provided so as to always be located in the oil sump even if the position of the oil sump in the storage chamber changes due to a change in the posture of the engine, and the lubricating oil sucked through the suction port is supplied to the lubricated portion. It is characterized by having done.

According to a second aspect of the present invention, in the first aspect, the storage chamber has a substantially spherical shape, and the suction port is rotatably supported around a cylinder axis and a crank axis.
In addition, a weight for urging the suction port to a vertically lower position is provided near the suction port.

According to a third aspect of the present invention, in the first aspect, the storage chamber has a substantially spherical shape, and the lubricating oil is always stored in a substantially full state, and the suction port is located substantially in the center of the storage chamber. It is characterized by doing.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the engine has an intake valve and an exhaust valve arranged in a cylinder block in parallel with a cylinder shaft, and a cam shaft in a crankcase. A side valve (SV) type engine arranged in parallel with the crankshaft, characterized in that the storage chamber is housed and arranged in a crankcase.

According to a fifth aspect of the present invention, there is provided an overhead camshaft (OHC) type engine according to any one of the first to third aspects, wherein the engine has an intake valve, an exhaust valve, and a cam shaft arranged in a cylinder head. The storage chamber is arranged near the cylinder head.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are claims 1 and 2.
FIG. 2 is a view for explaining a lubrication device for a 4-cycle engine according to the first embodiment of the second and fourth inventions, FIG. 1 is a diagram showing a configuration of the present lubrication device, and FIG. 2 is a sectional view of an intake valve portion.

In the figure, reference numeral 1 is a side valve type four-cycle single cylinder air-cooled engine equipped with the present lubrication system, in which a cylinder head 3 is fastened to an upper portion of a cylinder block 2 by a head bolt 4 and slid into a cylinder bore 2a. The piston 5 movably inserted and arranged is connected to the crankshaft 7 by the connecting rod 6.
It has a schematic structure connected to. The piston 5 is connected to the small end of the connecting rod 6 via a needle bearing 6a, and the large end of the connecting rod 6 is connected to the crank pin 7a of the crankshaft 7 via a needle bearing 6b.

A skirt-shaped crankcase portion 2b is integrally formed on the lower portion of the cylinder block 2, and an oil pan 9 is fastened to the lower surface of the crankcase portion 2b. The crankcase portion 2b and the oil pan 9
The crankshaft 7 is accommodated and arranged in a crank chamber 19 formed by the upper part of the crankshaft 7. The journal portions at both ends of the crankshaft 7 are mounted on the mating surface of the crankcase portion 2b and the oil pan 9 via a bearing 10. It is supported. A cooling fan 11 is mounted on one projecting end of the crankshaft 7, and an output gear (not shown) is mounted on the other projecting end. In addition, 12 is an ignition coil.

A combustion recess 3a is provided in a portion of the lower surface of the cylinder head 3 facing the cylinder bore 2a, and an ignition plug 8 is screwed to a position of the combustion recess 3a facing the center of the cylinder bore 2a. .

An intake port 13 and an exhaust port (not shown) are formed in parallel with each other in an extension 3b formed so as to bulge in the direction perpendicular to the crankshaft of the combustion recess 3a, and each port is a cylinder block. 2 is led to the side wall. A valve portion 14a of the intake valve 14 is arranged at the opening of the intake port 13 so that the opening can be opened and closed. The valve shaft 14b of the intake valve 14 extends downward in parallel with the axis of the cylinder bore 2a, and the lower end of the valve shaft 14b projects into the crank chamber 19. Further, the intake valve 14 is provided with a spring 15 for biasing the intake valve 14 in the closing direction. The exhaust valve arranged in the exhaust port has the same structure as the intake valve 14.

A cam nose 16a of a cam shaft 16 arranged in parallel with the crank shaft 7 is in sliding contact with the lower ends of the intake valve 14 and the exhaust valve, and the timing gear 17 fixed to the cam shaft 16 is a crank gear. It meshes with a drive gear 18 mounted on the shaft 7. In this way, the rotation of the crankshaft 7 causes the camshaft 16 to open and close the intake and exhaust valves.

Reference numeral 20 denotes the lubricating device of this embodiment, which has the following structure. A storage tank 21 for storing lubricating oil is housed, arranged and fixed in the crank chamber 19. The storage tank 21 is formed in a substantially spherical shape,
A pair of left and right support members 22 are oil-tightly supported by a pair of left and right boss portions 9a formed integrally with the oil pan 9 via an oil seal. Although the storage tank 21 is provided separately from the oil pan 9, the storage tank 21 may be formed integrally with the oil pan 9 by defining the inside of the oil pan 9 with a partition wall or the like.

An oil pipe 23 is inserted in the storage tank 21 so as to be parallel to the crankshaft 7, and the left and right ends of the oil pipe 23 are inserted into the support member 22. It is rotatably supported via a bearing 24 about an axis parallel to the crankshaft. The openings at both ends of the oil pipe 23 face the inner surface of the boss portion 9a.

A partition plate 25 is arranged at the center of the oil pipe 23 in the axial direction, whereby the inside of the oil pipe 23 is provided with a lubricating oil supply passage 23a and a breather passage 2.
It is classified into 3b. Also, the oil pipe 23
A holding member 28 is fixed to a central portion of the oil pipe 23 in the axial direction. A base portion of the breather pipe 26 communicating with the breather passage 23b is inserted into the holding member 28, and a rotating shaft of the oil pipe 23 is inserted through a bearing 28a. It is rotatably supported around an axis that is at a right angle, that is, parallel to the cylinder axis. The breather pipe 26 extends in a direction perpendicular to the axis from the oil pipe 23 and is bent in a dogleg shape from the middle thereof.
a is located near the inner surface of the storage tank 21 on the outer peripheral side.

The suction port 2 of the breather pipe 26
A weight 29a is fixed to the side opposite to 6a. The gravity of the weight 29a causes the breather pipe 26 to rotate around the rotation axis.

The breather pipe 2 of the holding member 28
A base portion of the suction pipe 27 communicating with the supply passage 23a is inserted on the side opposite to 6, and is rotatably rotatable about an axis perpendicular to the rotation axis of the oil pipe 23, that is, parallel to the cylinder axis, via a bearing 28b. It is supported. This suction pipe 2
7 extends from the oil pipe 23 in the direction perpendicular to the axis and is bent and formed in a V shape from the middle, and the suction port 27a of the suction pipe 27 is located near the inner surface on the outer peripheral side of the storage tank 21.

The suction port 27a of the suction pipe 27
A weight 29b is fixed in the vicinity. This weight 29b
The suction pipe 27 rotates around the axis of the oil pipe 23 (around the crankshaft) due to the gravity of the suction pipe 27.
It rotates about the axis of the base of the cylinder (around the cylinder axis).

As a result, the suction port 2 of the suction pipe 27
7a is always located in the oil sump A of the breather pipe 26 even if the position of the oil sump A in the storage tank 21 changes in the storage tank 21 due to a change in the engine posture, and the suction port 26a of the breather pipe 26 is It will be located outside the pool A.

One end of the supply pipe 30 is connected to one boss portion 9a of the oil pan 9 so as to communicate with the lubricating oil supply passage 23a of the oil pipe 23.
The other end of is connected to the oil passage 31 of the crankshaft 7. The oil passage 31 extends in the axial direction of the crankshaft 7 and extends obliquely toward the crankpin 7a from here.
The needle bearing 6b is opened.

An oil pump 32 for sucking the lubricating oil in the storage tank 21 and pumping it to the oil passage 31 is provided in the middle of the supply pipe 31. The oil passage 3
The lubricating oil supplied from No. 1 to the needle bearing 6b scatters on each lubricated portion such as the needle bearing 6a of the piston 6 and the cam shaft 16 to lubricate the lubricated portion. It flows along the outer wall of the tank 21 or the like and is collected by the bottom portion 9b of the crankcase 9.

The other boss portion 9a of the oil pan 9 is also provided.
Is connected to one end of a breather pipe 35 so as to communicate with the breather passage 23b of the oil pipe 23, and the other end of the breather pipe 35 is connected to a breather tank 36. Although the breather tank 36 is provided separately from the engine 1, it may be provided integrally with the engine 1.

The breather tank 36 has a substantially spherical shape, and its basic internal structure is substantially the same as the internal structure of the storage tank 21. That is, a pipe 38 is rotatably supported in the breather tank 36 about an axis parallel to the crankshaft 7, and the inside of the pipe 38 is connected by a partition plate 39 to the other end of the breather pipe 35. It is divided into a passage 38 a and an air passage 38 b communicating with the atmospheric diffusion pipe 44. Note that 38c is an opening for introducing blow-by gas into the breather tank 36.

A base portion of a breather pipe 40 communicating with the air passage 38b is inserted into a holding member 49 at a central portion of the pipe 38 in the axial direction, and is supported rotatably around an axis perpendicular to the rotation axis of the pipe 38. ing. The breather pipe 40 extends in a direction perpendicular to the axis from the pipe 38 and is bent in a V shape from the middle, and its suction port 40 a is located near the inner surface on the outer peripheral side of the breather tank 26. A weight 41a is fixed to the breather pipe 40 on the side opposite to the suction port 40a. The gravity of the weight 41a causes the breather pipe 40 to rotate around the rotation axis.

The breather pipe 4 of the holding member 49
A base portion of an oil pipe 43 communicating with the breather passage 38a is fixed to the side opposite to 0, and a weight 41b is fixed to the tip opening side of the oil pipe 43. The gravity of the weight 41b causes the oil pipe 43 and the breather pipe 40 to rotate around the pipe 38.

Reference numeral 45 is a drain pipe, and the drain pipe 45 is communicatively connected to the bottom portion 9b of the crankcase 9. Further, a one-way valve 46 for preventing backflow from the crankcase 9 is provided in the middle of the drain pipe 45.

The left and right bottom portions 9b of the oil pan 9 are also provided.
And the storage tank 21 are respectively connected to the return pipe 47a,
The return pipe 4 is communicatively connected by 47b.
In the middle of 7a47b, scavenging pumps 48a, 4a
8b is interposed. Further, the above crankcase portion 2
The storage tank 21 and the portion of the piston b facing the lower end position of the piston 6
Is connected to and by a return pipe 47c,
A scavenging pump 48c is provided in the middle of the return pipe 47c. This allows the crank chamber 19
The lubricating oil accumulated inside is returned to the storage tank 21.

Here, the three scavenging pumps 48a to 48c are coaxially arranged and driven by a common drive shaft. Note that it is also possible to join the suction port side portions of the return pipes 47a to 47c into one and then connect them to a common scavenging pump. In such a case, one scavenging pump is used. It is enough, and the cost can be suppressed.

Next, the function and effect of this embodiment will be described. In the lubricating device 20 of the present embodiment, the lubricating oil sucked from the suction port 27a of the suction pipe 27 in the storage tank 21 passes through the supply passage 23a and the supply pipe 30 from the oil passage 31 of the crankshaft 7 to the needle bearing 6b portion. Pumped to
From here, it scatters on the lubricated parts such as the piston back surface and the cam shaft 16 to lubricate the lubricated parts, and then the bottom part 9 of the oil pan 9
It is collected in b and is returned to the storage tank 21 again from here.

In this case, when the engine is in the upright position shown in FIG. 1, the oil sump A in the storage tank 21 is located at the lower end of the drawing, and the weight 27b is located at the lower side. The suction port 27a of the suction pipe 27 is located in the oil sump A, and the suction port 26a of the breather pipe 26 is
It is located outside the oil sump A of a. Therefore, in the storage tank 21, the lubricating oil is sucked through the suction port 27a of the suction pipe 27 without any trouble, and the air (blow-by gas) containing the oil mist is sucked through the suction port 26a of the breather pipe 26.

When the engine posture is changed from the upright state shown in the drawing to, for example, the state where the cylinder axis is tilted to the right, the oil sump is changed to the state of A1. In this case, as the engine posture changes, the weight 29b rotates the suction pipe 27 by its own weight around the rotation axis perpendicular to the oil pipe 23 so that the suction port 27a is located on the right side in the drawing. The breather pipe 26 is rotated by its own weight around a rotation axis perpendicular to the oil pipe 23 so that the suction port 26a is located on the left side in the drawing. As a result, the suction port 27a of the suction pipe 27 is located inside the oil sump A1 and the suction port 26a of the breather pipe 26 is located outside the oil sump A1 so that the suction of the lubricating oil and the suction of the blow-by gas are performed without any trouble. .

From the upright state shown in the figure,
For example, when it is turned upside down, the oil sump changes to the A2 state. In this case, the weight 29b moves along with the suction pipe 27 and the breather pipe 2 as the engine posture changes.
Rotate 6 around the oil pipe 23 upside down,
Also in this case, the suction port 27a of the suction pipe 27 is located in the oil sump A2, and the suction port 26 of the breather pipe 26 is also provided.
Since a is located outside the oil sump A2, suction of lubrication and suction of blow-by gas are performed without any trouble.

In this way, when the position of the lubricating oil moves to the left, right, front and back due to the change of the engine attitude, the suction port 27a of the suction pipe 27 follows the movement of the lubricating oil so that it is always located in the lubricating oil. Therefore, no matter how the engine posture is changed, the lubricating oil can be sucked and supplied to the lubricated portion.

The breather pipe 26 is always located on the opposite side of the suction pipe 27, and the weight 29a is used to rotate the suction port 26a to the opposite side of the oil sump. No, storage tank 2
The blow-by gas in 1 can be discharged to the breather tank 36 side.

Here, when the lubricating oil collected in the crank chamber 19 moves along with the change in the engine posture,
Return pipe 4 connected to each destination
It is sucked through 7a to 47c and returned to the storage tank 21.

Further, the drain position in the breather tank 36 moves to the left, right, front and back due to the change of the engine posture, but the suction port 40a of the air pipe 40 is always on the side opposite to the drain by the same action as described above. Since it is located, the drain does not flow out from the air pipe 40 to the outside.

As described above, according to the present embodiment, since the suction pipe 27 is arranged in the storage tank 21 so as to be rotatable about the cylinder axis and the crank axis, as described above, the lubrication is performed in accordance with the change in the engine attitude. Even if the oil moves to the left and right and up and down, the suction port 27a of the suction pipe 27 can always be located in the lubricating oil, and the lubricating oil can be reliably supplied to each lubricated portion, which allows the working posture. It is possible to use a 4-cycle engine for chainsaws, grass cutting machines, etc., where the power changes significantly.

The lubricating oil collected in the crankcase 9 is constantly collected in the storage tank 21 by the return pipes 47a to 47c connected to various places, and the collected lubricating oil flows out of the storage tank 21. Since the lubricating oil does not stay in the cylinder bore from the back side of the piston 6, the problem of excessive consumption of lubricating oil and misfire can be avoided.

Further, since the camshaft 16 is a side valve type engine having the crankcase 9 disposed therein, the storage tank 21 can be disposed in the crank chamber 19 without being disposed on the cylinder head side. Can be made compact.

FIG. 3 is a view for explaining a lubrication device for a four-cycle engine according to a second embodiment of the present invention as claimed in claims 1, 2 and 5, in which the same symbols as those in FIG. 1 are the same or corresponding parts. Indicates.

The engine 60 is an OHC type four-cycle air-cooled engine, which has an intake / exhaust port 62 communicating with the combustion recess 61a in the cylinder head 61.
An intake / exhaust valve 63 is provided at the opening of the combustion chamber of each port 62, and a cam shaft 64 for opening / closing the intake / exhaust valve 63 via a rocker arm 65 is provided in the cam chamber a of the cylinder head 61. It has a structure. In addition,
The cam shaft 64 is rotationally driven by the crank shaft 7 via a timing gear chain (not shown).

A substantially spherical storage tank 21 is arranged on the head cover 66 of the cylinder head 61, and the storage tank 21 is located above the cylinder head 61. A suction pipe 27 is provided in the storage tank 21.
Is rotatably arranged around the cylinder axis and the crankshaft, and its basic structure is the same as that of FIG. 1, so only the different parts will be described below.

The oil passages 31a and 31b connected to the discharge port of the supply pump 32 are connected to the crank shaft 7 and the cam shaft 64, respectively. A recovery passage 70 is formed in the bottom wall of the cylinder head 61 located at the bottom of the cam chamber a, and the recovery passage 70 is provided in the upper portion of the crankcase 9 via the drain pipe 45 of the breather tank 69. Connected for communication. Also, the bottom portion 9b of the crankcase 9
A return passage 9c is formed in the. A scavenging pump 48a is connected to the return passage 9c so that the lubricating oil in the bottom portion 9b is scavenging pump 48a.
Is returned to the storage tank 21 through the return pipe 47a.

The top wall of the head cover 66 and the storage tank 21 are connected to each other by a return pipe 47d. Further, a return pipe 47c is inserted and arranged in a portion facing the back surface of the piston 5 at the descending end position, and the return pipe 47c is connected to a return pipe 47a from the return passage 9c through a scavenging pump 48c. Has been done. As a result, the lubricating oil is recovered when the engine posture is reversed.

The breather tank 69 is arranged between the height of the storage tank 21 and the height of the opening of the recovery passage 70 on the side of the cam chamber a, and the air pipe 71 is rotatably attached to the breather tank 69. It is supported. This air tube 7
1 has an opening 71a for this weight 7 which is always positioned above.
2 is fixed.

In this embodiment, since the suction pipe 27 is rotatably arranged around the cylinder axis and the crank axis in the storage tank 21, the lubricating oil moves left and right and up and down as the engine posture changes. In addition, the lubricating oil can be surely supplied to each lubricated portion, the problems of excessive consumption of the lubricating oil and misfire can be solved, and the same effects as those of the above-described first embodiment can be obtained.

Further, since the storage tank 21 is positioned above the cylinder head 61, the lubricating oil in the cam chamber a when the engine posture is reversed can be easily recovered through the return pipe 47d. Note that when the engine posture is upright, the lubricating oil in the cam chamber a is collected in the recovery passage 70.
Is collected in the crank chamber through the drain pipe 45.

It is of course possible to employ the breather tank 36 shown in FIG. 1 instead of the breather tank 69.

In the above embodiment, the crankcase 9
The scavenging pump 48a was used to return the lubricating oil from the bottom 9b of the tank to the storage tank 21, but as shown in FIG. 4, a reed valve 80 may be provided in the return passage 9c instead of the scavenging pump. . That is, the valve chamber 81 is airtightly connected to the return passage 9c of the crankcase 9, and the reed valve 80 including the valve plate 80a and the stopper 80b is disposed in the valve chamber 81. As a result, the positive pressure caused by the downward movement of the piston 5 opens the valve plate 80a to pump the lubricating oil to the return pipe 47, and the negative pressure caused by the upward movement closes the valve plate 80a to prevent backflow. In such a case, the scavenging pump can be eliminated and the cost can be reduced.

In each of the above embodiments, the storage tank 21
Although the suction pipe is rotatably installed inside, the suction port is always located in the lubricating oil even if the operating posture of the engine changes, so that the lubricating oil can be sucked in stably. Other forms can be adopted for the structure for locating in the lubricating oil.

FIG. 5 is a schematic diagram for explaining a third embodiment according to the inventions of claims 1 and 3. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. Reference numeral 91 is a storage tank, and the storage tank 91 has a substantially spherical shape.
Is set to a volume that can be stored in a full state at all times. The position of the storage tank 91 is not particularly limited, and may be any position, and may be a separate body or an integral body with the crankcase or the like.

Numeral 92 is a suction pipe, which is fixed to the storage tank 91, and its suction port 92a is located substantially at the center of the storage tank 91. Further, 93 is a return pipe for returning the lubricating oil into the storage tank 91, and the pipe 93 is fixed to the storage tank 91,
The opening 93a is located in the storage tank 91.

In this embodiment, since the storage tank 91 is substantially filled with the lubricating oil A, the suction port 92a is located in the lubricating oil A no matter how the oil level changes depending on the engine posture. Therefore, the lubricating oil can always be sucked in stably, and therefore the lubricated portion can be reliably lubricated with a very simple structure.

[0059]

As described above, according to the invention of claim 1,
Even if the position of the oil sump in the storage chamber changes due to a change in the attitude of the engine, the suction port is always located in the oil sump, and the lubricating oil sucked through the suction port is supplied to the lubricated part. Therefore, even if the engine attitude changes, the lubricating oil can be reliably supplied to the lubricated portion, and therefore, there is an effect that the 4-cycle engine can be adopted for a chain saw, a mower, or the like.

According to the second aspect of the present invention, since the storage chamber is a substantially spherical body, and the suction port is rotatably supported about the cylinder axis and the crankshaft, the engine posture fluctuates left and right and front and back. Is effective in realizing a structure in which the suction port is always located in the lubricating oil.

According to the third aspect of the present invention, the lubricating oil is always stored in the storage chamber in a substantially full state, and the suction port is located substantially in the center of the storage chamber. This has the effect of realizing a structure located in the lubricating oil.

According to the fourth aspect of the present invention, since the side valve engine has the camshaft arranged in the crankcase, forced lubrication of the camshaft and recovery of lubricating oil from the cam chamber are unnecessary. The storage tank can be placed in the crankcase, which has the effect of downsizing the entire engine.

According to the fifth aspect of the present invention, in the case of the OHC engine in which the cam shaft is arranged in the cylinder head, the reservoir chamber is arranged in the cylinder head at substantially the same height as that of the OHC engine. This has the effect of facilitating the recovery of lubricating oil when it is turned upside down.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining a lubricating device for a side valve type 4-cycle engine according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an intake valve portion of the engine.

FIG. 3 is a configuration diagram for explaining a lubrication device for an overhead camshaft type 4-cycle engine according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a lubricating device according to a modified example of the second embodiment.

FIG. 5 is a configuration diagram for explaining a lubricating device according to a third embodiment of the invention of claims 1 and 3;

[Explanation of symbols]

 1 Side Valve Type 4-Cycle Engine 9 Crankcase 20 Lubricating Device 21,91 Storage Tank (Storage Room) 27 Suction Pipe 27a Suction Port 61 Cylinder Head A Oil Sump

Claims (5)

[Claims] 1. A lubrication device for a four-cycle engine in which lubrication is forcibly supplied to a lubricated portion, wherein a reservoir chamber for accumulating lubricating oil is provided, a suction port is provided in the reservoir chamber, and an oil in the reservoir chamber is changed by changing the posture of the engine. Lubrication of a four-cycle engine, characterized in that it is provided so that it is always located in the oil sump even if the sump position changes, and the lubricating oil sucked through the suction port is supplied to the lubricated portion. apparatus. 2. The storage chamber according to claim 1, wherein the storage chamber has a substantially spherical shape, and the suction port is rotatably supported about a crankshaft and about a shaft perpendicular to the crankshaft, and the suction port. A lubricating device for a four-cycle engine, characterized in that a weight for urging the suction port to a vertically lower position is provided in the vicinity thereof. 3. The storage chamber according to claim 1, wherein the storage chamber has a substantially spherical shape, and the lubricating oil is constantly stored in a substantially full state, and the suction port is located substantially at the center of the storage chamber. Lubricator for 4-cycle engine characterized by 4. The engine according to claim 1, wherein the engine has an intake valve and an exhaust valve arranged in a cylinder block in parallel with a cylinder shaft, and a cam shaft in a crankcase in parallel with a crank shaft. A lubrication device for a four-cycle engine, which is a side valve (SV) type engine provided and in which the storage chamber is housed and arranged in a crankcase. 5. The overhead camshaft (OH) according to claim 1, wherein the engine has an intake valve, an exhaust valve, and a camshaft arranged in a cylinder head.
A lubrication device for a four-cycle engine, which is a C) type engine, wherein the storage chamber is arranged near an upper side of a cylinder head.