JPH1162537A - Lubricating device for outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the whole height of an engine and lubricate oil by forming recessed grooves extending in the lateral direction from recessed parts of circular-arc-shaped section formed on the upper faces on the cylinder bore side of the bearing parts of a cylinder body. SOLUTION: This engine is constituted so that the spaces between mutual cylinders arranged in the vertical direction are made narrower than the thickness of a bearing part 64, for restraining the whole height of the engine to the utmost low. Accordingly, at forming a cylinder bore 66, one part of the face in the vertical direction of the bearing part 64 is recessed so as to extend the inner wall of the cylinder bore 66, and a recessed part 67 of circular-arc- shaped section is formed on the face. By forming the recessed part 67 in this way, oil remaining on the bearing part 64 is gathered here. Through holes 68 for draining oil are provided, and oil flowing in the recessed parts 67 flows to the bottom of the crank case through these through holes 68. Hereby, the whole height of the engine is lowered, and oil can be lubricated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an outboard motor engine for pumping oil to a crankshaft bearing by an oil pump.

[0002]

2. Description of the Related Art Conventionally, as an engine for an outboard motor, in order to keep the overall height of the engine as low as possible, an interval between cylinders arranged in a vertical direction is set for a crankshaft extending toward a crankcase side between cylinders in a cylinder body. Some bearings have a thickness smaller than the thickness of the bearing portion (see, for example, JP-A-8-10
0618). When this structure is adopted, when forming the cylinder hole, a part of the vertical surface of the bearing portion is dented as if the hole wall surface of the cylinder hole is extended, and a concave portion having an arc-shaped cross section is formed on this surface. .

In the engine disclosed in the above publication, oil is pumped to the bearing portion by an oil pump to lubricate the sliding contact surface with the crankshaft, and the oil flows from the bearing portion to an oil passage in the crankshaft. In this way, oil is supplied to the large ends of the piston pins and connecting rods and the back side of the piston. Part of the oil that has lubricated these parts collects in the recesses of the bearing part.

[0004] When oil accumulates in the concave portion, when the outboard motor is tilted so as to lower the cylinder head by performing a tilt operation, the oil flows from the concave portion into the cylinder hole and burns, and white smoke is generated. May occur. For this reason, in this engine, an oil discharge hole is formed in the bearing portion so as to penetrate the bearing in the vertical direction, and the oil flows downward from the recess through the oil discharge hole. That is, a structure is adopted in which oil flows downward through a plurality of provided bearing portions.

[0005] A disk-shaped space is formed below a bearing portion located at the lowermost portion of the cylinder body, and a horizontal oil extending from the outer peripheral portion of the space in parallel with the cylinder axis and communicating with the oil return passage. A passage is formed.
Therefore, the oil that has flowed down to the lowermost bearing portion is discharged from the oil discharge hole of the bearing portion to the oil return passage through the disk-shaped space and the lateral oil passage.

[0006]

However, if a disk-shaped space is formed below the lowermost bearing portion as described above, the overall height of the engine will be increased by the vertical dimension of this space. The present invention has been made in order to solve such a problem, and it is an object of the present invention to reduce the overall height of an engine as low as possible while adopting a structure in which oil does not accumulate in a concave portion of the bearing portion. With the goal.

[0007]

SUMMARY OF THE INVENTION In order to solve this object, an outboard motor engine lubricating apparatus according to the present invention comprises an arc-shaped concave section formed on an upper surface of a bearing portion of a cylinder body on a cylinder hole side. A groove extending in the lateral direction is formed, and the recess communicates with the oil return passage beside the bearing portion via the groove.

According to the present invention, the oil that has flowed into the concave portion of the bearing portion of the cylinder body is discharged to the oil return passage through the concave groove. Therefore, a passage for discharging oil from the recess into the crank chamber can be formed by utilizing the thickness of the bearing portion.

According to another aspect of the present invention, there is provided a lubricating apparatus for an outboard motor engine according to the above-described lubricating apparatus, wherein the engine is a multi-cylinder engine, and a concave groove is formed in a lowermost bearing portion. A through hole is formed in a bearing portion above the portion to penetrate the concave portion in a vertical direction.

According to the present invention, the oil flows down by gravity from the concave portion of the upper bearing portion to the lowermost bearing portion, and is discharged from the concave portion of the lowermost bearing portion through the concave groove to the oil return passage. An outboard motor engine lubrication device according to another invention is the lubrication device according to the invention described above, wherein the through hole is formed obliquely so as to extend from one end on the cylinder hole side to the other end on the crank chamber side. is there.

According to the present invention, the through hole can be formed in the bearing portion by machining from the cylinder hole side.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lubricating device for an outboard motor engine according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of an outboard motor employing an engine lubrication device according to the present invention, FIG. 2 is a plan view showing a schematic configuration of the engine, FIG. 3 is a side view thereof, and FIG. It is drawn in a state where it is set. 4 is a rear view of the engine viewed from the rear of the outboard motor, FIG. 5 is a cross-sectional view taken along line VV in FIG. 4, and FIG. 6 is a front view of the cylinder body viewed from the front of the outboard motor. 7 is a sectional view taken along line VII-VII in FIG. 6, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a rear view showing a state where the cylinder head is viewed from the rear of the outboard motor, FIG. 10 is a sectional view of the cylinder head, and FIG. 10 (a) is a sectional view taken along line X--X in FIG. 1
0 (b) is a sectional view taken along line XI-XI in FIG. FIG.
FIG. 3 is a side view showing an ignition coil.

In these figures, reference numeral 1 denotes an outboard motor according to this embodiment, and reference numeral 2 denotes a stern plate on which the outboard motor 1 is mounted. The outboard motor 1 includes an upper casing 4 having a clamp mechanism 3 for gripping the stern plate 2, and a lower casing 5 attached to a lower end of the upper casing 4.
And an engine 7 mounted on the upper casing 4 via a guide exhaust 6 accommodating a mount (not shown). The engine 7 is covered with a cowling 1a.

The engine 7 is a DOHC type four-cylinder engine. As shown in FIGS. 2 and 3, a crankshaft 8 is supported on the front side of the outboard motor so that the axis of the engine 7 extends in the vertical direction. The structure is arranged in the direction. 2 and 3, the arrow F indicates the front of the outboard motor 1. The crankshaft 8 is rotatably supported by a cylinder body 9 and a crankcase 10, and has an upper end connected to a valve gear 11 and a flywheel (not shown), and a lower end connected to a drive shaft 12. ing. Further, a piston 14 is connected to a crankpin of the crankshaft 8 via a connecting rod 13.

As shown in FIG. 1, the drive shaft 12 extends downward in the upper casing 4 and the lower casing 5, and has a lower end connected to a propeller shaft 16 via a forward / reverse switching mechanism 15. A propeller 17 is mounted on the propeller shaft 16.

The valve gear 11 has a cylinder head 18
An intake camshaft 19 and an exhaust camshaft 20 rotatably supported so that their axes are directed in the vertical direction, a timing belt 21 for connecting these camshafts 19 and 20 to the crankshaft 8, a camshaft 19 and The engine 20 includes an intake valve 22 and an exhaust valve 23 for each cylinder driven. In addition,
The support structure of the camshafts 19 and 20 and the support structure of the intake / exhaust valves 22 and 23 in the valve train 11 have the same structure as that of a conventionally known motorcycle DOHC engine. Detailed description is omitted.

The intake camshaft 19 and the intake valve 22 are
Outboard motor left side (direction of arrow F in the figure is forward of the outboard motor)
, And the exhaust camshaft 20 and the exhaust valve 23 are disposed on the right side of the outboard motor. Further, the intake valve 22 and the exhaust valve 23
, Two valves are provided for each cylinder, and the valve element is disposed around the combustion chamber 24. At the center of the combustion chamber 24 is a spark plug 2
5 (see FIG. 3).

An intake passage in which the intake valve 22 opens and closes includes an intake device 2 provided on the left side of the outboard motor of the engine 1 as shown in FIG.
The exhaust passage, which opens and closes the exhaust valve 23, communicates with an exhaust passage 27 provided on the right side of the outboard motor of the engine 1. The intake device 26 includes an intake silencer 26a, a carburetor 26b, and an intake manifold 26c. The exhaust passage 27 is formed such that the exhaust passages of the respective cylinders gather at the cylinder side, and communicates with an exhaust pipe (not shown) extending downward from the lower end of the engine 1. The configurations of the intake system and the exhaust system are the same as those of the conventional outboard motor.

The camshafts 19, 20 and the intake / exhaust valves 22, 23 are covered by a head cover 28 attached to the cylinder head 18. This head cover 28 is shown in FIG.
As shown in the figure, the outboard motor 1 is formed in a U-shape that opens downward as viewed from the rear, and the outer side of the outboard motor 1 It is formed so as to bulge toward the side. An intake camshaft-side cam chamber that accommodates the intake camshaft 19 and the like is indicated by reference numeral 29 in the figure, and an exhaust camshaft-side cam chamber that accommodates the exhaust camshaft 20 and the like is indicated by reference numeral 30. These cam chambers 2
9 and 30 communicate with each other via a communication chamber 31 (see FIG. 4) formed at the upper end of the head cover 28. The intake camshaft side cover main body forming the intake camshaft side cam chamber 29 in the head cover 28 is denoted by reference numeral 28a, and the exhaust camshaft side cover main body forming the exhaust camshaft side cam chamber 30 is denoted by reference numeral 28b. The head cover 2
A seal member indicated by reference numeral 28c in FIG. 5 is interposed between the peripheral edge of the cylinder 8 and the cylinder head 18.

A fuel pump 32 having a structure driven by the intake camshaft 19 is mounted on an intake camshaft-side cam chamber cover body 28a of the head cover 28, and an oil injection port 33 is formed. Also, the exhaust camshaft side cover body 2
8b includes a holder 3 for locking two plug cords 34.
5, and an oil separator 36 is provided.

The holder 35 is provided with the cylinder head 18.
The plug cord 34 extending from the ignition coil 37 attached to the side of the head cover 28 is disposed below the head cover 28 so as to be bent in a U-shape in a rear view shown in FIG. By bending the plug cord 34 in this manner, water droplets attached to the plug cord 34 drop downward from the top of the bent portion, thereby preventing the spark plug 25 from flowing along the plug cord 34. Can be.

In this embodiment, as shown in FIG. 11, the portion of the head cover 28 where the holder 35 is mounted is such that the protruding height from the cylinder head 18 is relatively low. By attaching the holder 35 to such a low portion, the plug cord 34 wired so as to straddle the exhaust camshaft side cover main body 28b of the head cover 28 does not project from the head cover 28.

The ignition coil 37 shown in FIG.
As shown in the figure, the plug cord 34 is fixed to the cylinder head 18 so that the lead-out direction is directed obliquely downward.
By adopting this mounting structure, it is possible to prevent water droplets attached to the plug cord 34 from flowing along the plug cord 34 to the ignition coil 37. In this embodiment, the two ignition coils 37 are arranged vertically and the plug cord 3 is connected as described above.
4 is bent in a U-shape, so that the plug cords 34 can easily come into contact with each other.
Are disposed so as to protrude relatively far from the cylinder head 18 to prevent the plug cords 34 from coming into contact with each other. If the structure is such that the plug cords 34 easily come into contact with each other, the contact portions may be worn out due to engine vibrations or the like, resulting in electric leakage.

The oil separator 36 is for separating oil from blow-by gas generated in the engine. As shown in FIG. 5, the inside of the exhaust camshaft side cover body 28b of the head cover 28 extends in the horizontal direction of FIG. A first partition plate 36a integrally formed with the head cover 28 so as to define the first partition plate 36a and a second partition that defines the interior of the exhaust camshaft side cover body 28b into the first partition plate 36a side and the cylinder head 18 side. And a plate 36b.

As shown in FIG. 4, the first partition plate 36a extends vertically in the exhaust camshaft side cover main body 28b, and forms a U-shaped bent-by passage in the cover main body 28b. ing. The passage for the blow-by gas is formed in the through hole 3 formed in the upper part of the second partition plate 36b.
8 through the cylinder head 1 of the cam chamber 30 on the exhaust camshaft side.
8 and also communicates with the intake passage in the intake silencer 26b via a blow-by gas hose 39 attached to the side of the head cover 28. Since the exhaust camshaft side cam chamber 30 and the intake camshaft side cam chamber 29 communicate with each other via the communication chamber 31, the blow-by gas in these cam chambers is separated by the oil separator 36 so that the oil is separated by the intake silencer. It is sucked into 26a.

As shown in FIG. 5, the intake camshaft-side cam chamber 29 communicates with a crank chamber 41 via a blow-by gas passage 40 extending through the cylinder head 18 and the cylinder body 9. The blow-by gas passage 40 is formed in a cylinder side portion between four cylinders arranged in the vertical direction so as to be parallel to the cylinder axis. That is, the blow-by gas passage 40
The outboard motor 1 is formed at three locations in the vertical direction so as to extend in the front-rear direction. An opening on the cylinder head 18 side in the blow-by gas passage 40 is indicated by reference numeral 40a in FIG. In this embodiment, the rotation direction of the crankshaft 8 is set clockwise as viewed from above so that oil scattered by the rotation of the crankshaft 8 does not blow into the blow-by gas passage 40. Specifically, the piston 14
A blow-by gas passage 40 is formed on the side in the direction in which the crankpin moves when moving from top dead center to bottom dead center. The direction of rotation of the crankshaft 8 is indicated by an arrow R in FIGS.

The crank chamber 41 is formed so that the cylinder holes of all the cylinders communicate with each other through the communication holes 44 of the partition walls 42 and 43 provided between the cylinders. Therefore, blow-by gas generated in each cylinder is supplied to the crank chamber 41.
Flows through the blow-by gas passage 40 into the intake camshaft side cam chamber 29, and is sucked into the intake silencer 26a via the oil separator 36 and the blow-by gas hose 39 as described above.

Next, the lubricating device for the engine 7 will be described. The lubrication of the engine 7 is performed by an oil pump 51 provided at the lower part of the engine as shown in FIG.
2 is carried out by pumping oil from the cylinder 2 and feeding it to the oil supply passage 53 in the cylinder body 9. The oil pump 51 has a structure in which the drive shaft 12 is driven. The oil supply passage 53 extends upward from the lower end of the cylinder body 9 as shown in FIG. 3, and communicates with an oil inlet on the outer peripheral portion of the oil filter 54.

The oil filter 54 has a structure in which the oil flowing into the oil inlet is filtered and supplied from the center to the main gallery 55 of the cylinder body 9. The main gallery 55 extends downward and upward from the oil filter 54 in the cylinder body 9. As shown in FIG. 5, a crankshaft-side oil passage 56 communicates with the main gallery 55. An oil passage 57 extending toward the intake camshaft 19 and an oil passage 58 extending toward the exhaust camshaft 20 communicate with the upper end of the main gallery 55. The downstream ends of these oil passages 57 and 58 are connected to the camshaft-side oil passages 5 extending downward in the cylinder head 18 along the intake camshaft 19 and the exhaust camshaft 20.
9, 60. The camshaft-side oil passage 5 is provided in bearing portions of the intake camshaft 19 and the exhaust camshaft 20.
9. The oil is supplied via a branch passage 61 extending laterally from the exhaust camshaft-side oil passage 60. This branch passage 6
The opening on the cylinder head 18 side of FIG.
Indicated by

The oil passage 56 through which oil for lubricating the crankshaft 8 flows includes the partition wall 42 in the cylinder body 9, the upper wall of the cylinder body indicated by reference numerals 62 and 63 in FIG. It is bored in the wall and opens to the sliding contact surface of the bearing portion 64 formed integrally with these walls. This opening is indicated by reference numeral 56a in FIG. The oil flowing out from the opening lubricates the sliding contact surface and flows into an oil passage 65 (see FIG. 3) formed in the crankshaft 8 to flow into the large end of the connecting rod 13 and the piston 14.
Lubricate.

The oil supplied to the lubricated portion around the crankshaft passes through the communication holes 44 of the partition walls 42 and 43 while leaving a part of the oil in the bearing portion 64, and the crank chamber 41.
Flows to the bottom inside. In the engine 7, the interval between cylinders arranged in the vertical direction is made smaller than the thickness of the bearing portion 64 in order to keep the overall height of the engine as low as possible. For this reason, when forming the cylinder hole 66, a part of the vertical surface of the bearing portion 64 is recessed so as to extend the hole wall surface of the cylinder hole 66, and as shown in FIGS. A concave portion 67 having an arcuate cross section is formed in FIG.

When the recess 67 is formed as described above, the oil remaining on the bearing portion 64 collects here as described above. In the engine 7, as shown in FIG. 7, a through hole 68 for oil drain is formed in the bearing portion 64 located between the cylinders, and the oil flows into the recess 67 at an angle. 68 and flows downward through the recess 6
7 so that it does not accumulate. That is, the oil that has fallen to the three bearing portions 64 located between the cylinders flows through the through holes 68 to the bottom of the crank chamber 41.

The lowermost bearing portion 64 corresponds to FIGS.
As shown in FIG. 7, a concave groove 69 extending from the concave portion 67 in the lateral direction orthogonal to the cylinder axis is formed. This concave groove 69
Has one end open into the recess 67 and the other end communicating with the crank chamber 41 beside the bearing portion. Therefore, oil flowing down from the upper bearing portion 64 and oil flowing to the lowermost bearing portion 64 by lubricating the lowermost piston 14 and this piston drive system pass through the concave groove 69 from the concave portion 67. And flows down to the bottom of the crank chamber 41. As shown in FIG. 8, a lower end of the crank chamber 41 forms a crank chamber side oil return passage 70 communicating with the inside of the oil pan 52, and the oil flowing to the bottom of the crank chamber 41 passes through the oil return passage 70. The oil passes through the oil pan 52.

On the other hand, the oil supplied to the bearings of the intake camshaft 19 and the exhaust camshaft 20 lubricates the bearings and the cams of both camshafts and the sliding parts of the intake and exhaust valves 22 and 23. After lubrication, it flows downward in the intake camshaft side cam chamber 29 and the exhaust camshaft side cam chamber 30. In FIG.
Holes for mounting the exhaust valves 22 and 23 are indicated by reference numerals 22a and 23a, and holes for inserting the head bolts 71 (see FIG. 5) are indicated by reference numeral 71a. The hole for mounting the spark plug 25 is indicated by reference numeral 25a. The two holes indicated by reference numeral 72 formed between the spark plug holes 25a are used to connect the anode A to the cylinder head 18 as shown in FIGS.
Mounting holes for mounting on Since the ignition plug 25 and the anode A are attached to an open portion between the intake camshaft side cam chamber 29 and the exhaust camshaft side 31, maintenance is easy. Moreover, since oil does not flow into this portion, it is not necessary to provide an oil seal member on the ignition plug 25 or the anode A side.

An oil passage indicated by reference numeral 73 in FIG. 9 is formed at the lower end of the cylinder head 18 forming the two cam chambers 29 and 30, and the oil is supplied from the oil passage 73 to the cam on the cylinder body 9 side. Chamber side oil return passage 74
(See FIGS. 3 and 7).

The lower end of the cylinder head 18 is
A central portion corresponding to 4 is formed so as to protrude downward from both sides. This protrusion is indicated by reference numeral 75 in FIG. The oil passage 73 is formed in the protruding portion 75 so as to have an arc-shaped cross section that is convex downward. One end of the oil passage 73 opens to the intake camshaft side cam chamber 29, and the other end opens to the exhaust camshaft side cam chamber 30. The cam chamber side oil return passage 74 has an upstream end communicating with the oil passage 73 and a downstream end communicating with the inside of the oil pan 52.

The oil passage 73 has a head bolt hole 71a opened in the intake camshaft side cam chamber 29 of the cylinder head 18 and a head bolt hole 71a opened in the exhaust camshaft side cam chamber 30. It is formed so as to be located between them. In other words, the oil passage 73 is formed closer to the center of the cylinder head 18 than the head bolt 71. In this embodiment, an example is shown in which the two cam chambers 29 and 30 are communicated with each other by one oil passage 73. However, an oil passage extending to the cylinder body 9 side is formed in each of the cam chambers 29 and 30, and these oil passages are formed. A structure in which the oil passage communicates with the inside of the cylinder body 9 may be employed.

The portion of the lower end of the cylinder head 18 which is open outward between the two cam chambers 29 and 31 is shown in FIG.
Is formed so as to be recessed from the head cover mounting surface 18a. For this reason, when the engine 7 is tilted such that the head cover is relatively upward, as in the case of mooring the outboard motor 1 by greatly tilting, the water that has penetrated into the cowling 1a is at the bottom of the open portion. May accumulate. As shown in FIG.
By forming the drain hole 77 and the drain hole 77 in the cylinder head 18, the accumulation of water as described above is prevented.

In the lubricating device for the outboard motor engine 7 configured as described above, the oil is supplied from the main gallery 55 to the crankshaft 8, the connecting rod 13, the piston 14, the intake / exhaust by the oil pump 51 being driven by the engine 7. It is supplied to the lubricated portions of the camshafts 19, 20 and the intake / exhaust valves 22, 23. The oil supplied to the side of the crankshaft 8 returns from the bottom of the crank chamber 41 to the oil pan 52 through the oil return passage 70, and the intake and exhaust camshafts 19, 20
The oil supplied to the side returns from the bottom of the cam chambers 29 and 30 to the oil pan 52 through the oil passage 73 and the cam chamber side oil return passage 74.

The oil supplied to the bearing portion 64 located between the cylinders after lubricating the lubricated portion around the crankshaft is:
It is supplied to the lowermost bearing part 64 through the through hole 68. The oil guided to the lowermost bearing portion 64 is
7, the gas enters the groove 69 and passes through the groove 69 to be discharged to the bottom of the crank chamber 41 beside the bearing portion 64.

Accordingly, a passage (concave groove 69) for discharging oil from the recess 67 to the crank chamber 41 is provided in the bearing portion 6.
4, the overall height of the engine is relatively lower than in the conventional case where a disk-shaped space is formed below the bearing portion to drain oil. can do.

Further, the engine 7 shown in this embodiment
Are the intake camshaft side cam chamber 29 and the exhaust camshaft side cam chamber 30
One end and the other end of the oil passage 73 that is convex downward at the bottom of the oil chamber 73 are opened.
Since the oil inside is discharged, the oil in both cam chambers 29 and 30 can be gathered and discharged to the center of the cylinder head 18. For this reason, a large amount of oil is smoothly supplied from both cam chambers 29 and 30 and the cam chamber 2
It can be discharged so that it does not accumulate in 9, 30.

Further, in this embodiment, the blow-by gas is introduced from the crank chamber 41 to the intake camshaft side cam chamber 29 and flows from the cam chamber 29 to the exhaust camshaft side cam chamber 30 via the communication chamber 31. Since the intake air is sucked into the intake system, the oil contained in the blow-by gas adheres to parts and protrusions in the cam chamber when the blow-by gas flows through the cam chamber. For this reason, the cam chamber of the engine 7 functions as an oil separator that separates oil from blow-by gas, and oil can be reliably separated from blow-by gas. In this embodiment, the exhaust camshaft side cover body 28 of the head cover 28 is used.
Since the oil separator 36 is also provided in b, the efficiency of separating oil is increased.

In addition, blow-by gas is supplied to the crank chamber 41.
Is formed on the cylinder side in the direction in which the crankpin moves when the piston 14 moves from the top dead center to the bottom dead center. Can be prevented from being blown into the blow-by gas passage 40 due to the rotation of the oil.

[0046]

As described above, according to the present invention, the oil that has flowed into the concave portion of the bearing portion of the cylinder body is discharged to the oil return passage through the concave groove. Can be formed using the thickness of the bearing portion. Therefore, the overall height of the engine can be relatively reduced as compared with a conventional configuration in which a disk-shaped space is formed below the bearing portion to drain oil.

According to another invention in which a concave groove is formed in the lowermost bearing portion and a through hole is formed in the concave portion of the upper bearing portion, the oil is moved to the lowermost portion from the concave portion of the upper bearing portion by gravity. It flows down to the bearing portion, and is discharged from the concave portion of the lowermost bearing portion through the concave groove to the oil return passage. Therefore, the oil can be discharged from the recesses of all the bearing portions by gravity.

According to another aspect of the invention in which the through hole is formed obliquely, the through hole can be formed in the bearing portion by machining from the cylinder hole side, so that the engine can be easily manufactured. That is, when the through-hole is formed in the vertical direction, a hole is also formed in the bottom portion of the cylinder body,
Although this hole must be closed with a plug, the plug according to the present invention eliminates the need for plugging.

[Brief description of the drawings]

FIG. 1 is a side view of an outboard motor employing an engine lubrication device according to the present invention.

FIG. 2 is a plan view showing a schematic configuration of an engine.

FIG. 3 is a side view showing a schematic configuration of an engine.

FIG. 4 is a rear view showing a state where the engine is viewed from the rear of the outboard motor.

FIG. 5 is a sectional view taken along line VV in FIG.

FIG. 6 is a front view showing a state where the cylinder body is viewed from the front of the outboard motor.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a sectional view taken along line VIII-VIII of a main part in FIG. 7;

FIG. 9 is a rear view showing a state where the cylinder head is viewed from the rear of the outboard motor.

FIG. 10 is a sectional view of a cylinder head.

FIG. 11 is a side view showing an ignition coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 7 ... Engine, 8 ... Crankshaft, 9 ... Cylinder body, 51 ... Oil pump, 64 ... Bearing part, 6
6 ... cylinder hole, 67 ... concave part, 69 ... concave groove.

Claims (3)

[Claims] 1. A lubricating device for an outboard motor engine for pumping oil to a crankshaft bearing portion by an oil pump, wherein a cylinder hole is formed on an upper surface of the crankshaft bearing portion provided on a cylinder body on a cylinder hole side. An oil discharge recess having an arc-shaped cross section extending to the case side is formed, and a recess groove extending in a lateral direction from the recess is formed, and the recess is connected to the oil return passage through the recess through the oil return passage. A lubricating device for an outboard motor engine, wherein the lubricating device communicates with a motor. 2. The lubricating device for an outboard motor engine according to claim 1, wherein the engine is a multi-cylinder engine, a concave groove is formed in a lowermost bearing portion, and a concave portion is formed in a bearing portion above the bearing portion. A lubricating device for an outboard motor engine, wherein a through-hole penetrating a concave portion in a vertical direction is formed. 3. The outboard motor lubrication system according to claim 2, wherein the through hole is formed obliquely so as to extend from one end on the cylinder hole side to the other end on the crank chamber side. Engine lubrication system for external units.