JPH08334010A - Lubricating device of four-cycle outboard motor - Google Patents

Abstract

PURPOSE: To reduce the size of an oil level gauge by arranging the oil level gauge on the side except both left and right sides of an internal combustion engine, and arranging the oil level gauge in the vertical direction as much as possible in a lubricating device of a four-cycle outboard motor. CONSTITUTION: In a lubricating device of a four-cycle outboard motor 110, lubricating oil after lubricating a lubrication necessary part of an internal combustion engine 113 is flowed in an oil storage chamber 115, and a suction port 118A of a suction pump 116 is opened in the oil storage chamber 115, and the lubricating oil in the oil storage chamber 115 is supplied to the lubrication necessary part of the internal combustion engine 113 through the suction pump 116. The oil storage chamber 115 is arranged under the internal combustion engine 113, and is arranged so that a vertical crankshaft 29 and a camshaft 32 are put in the longitudinal relationship, and an oil level gauge 120 to be inserted into the oil storage chamber 115 is arranged in the rear of a cylinder head 24 of the internal combustion engine 113 in an upper surface view.

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 outboard motor.

[0002]

2. Description of the Related Art Conventionally, as a lubricating device for a four-cycle outboard motor having a vertically mounted crankshaft, an oil reservoir is disposed below an engine body to lubricate parts of the engine's crank chamber and cam chamber that require lubrication. Lubricating oil is allowed to flow into the oil reservoir, the suction port of the suction pump is opened in the oil reservoir, and the lubricating oil in the oil reservoir is supplied to the required portion of the engine via the suction pump. There is. In a conventional lubricating device, an oil reservoir is disposed below a cylinder block of an internal combustion engine, and the cylinder is placed horizontally in the front-rear direction of the outboard motor. The equipment and exhaust system are installed. A first insertion hole is formed in the lower end of the cylinder block on the right side surface or the left side surface of the internal combustion engine, a second insertion hole is formed in the intermediate member, and an oil level gauge is provided in the first insertion hole and the second insertion hole.
It was inserted into the oil reservoir through the insertion hole, and the oil level gauge was arranged and used in an inclined state.

[0003]

There has been a demand for an outboard motor having high performance, low fuel consumption and no emission of harmful gases, and a four-cycle internal combustion engine has been adopted, and the number of cylinders of the internal combustion engine has been increasing. is there. For this reason, the number of components of the intake system and the exhaust system mounted on the left and right sides of the internal combustion engine has increased, and it has become difficult to secure a space for inserting an oil level gauge. The present invention provides a lubricating device for a four-stroke outboard motor, wherein an oil level gauge is disposed on a side other than the left and right sides of the internal combustion engine, and the oil level gauge can be disposed as vertically as possible. It is an object to reduce the size of the device.

[0004]

SUMMARY OF THE INVENTION According to the present invention, lubricating oil after lubricating a necessary portion of an internal combustion engine is allowed to flow into an oil reservoir, and a suction port of a suction pump is opened to the oil reservoir to open the oil reservoir. In a lubricating device for a four-stroke outboard motor for supplying lubricating oil in the oil chamber to a part requiring lubrication of the internal combustion engine via a pump, an oil chamber is disposed below the internal combustion engine, and a vertically disposed crankshaft and cam The first configuration is such that the shaft and the shaft are arranged in a front-rear relationship, and the oil level gauge inserted into the oil reservoir is arranged behind the cylinder head of the internal combustion engine in a top view. Further, the present invention allows the lubricating oil after lubricating the necessary parts of the internal combustion engine to flow into the oil reservoir,
A lubricating system for a four-cycle outboard motor in which a suction port of a suction pump is opened to an oil storage chamber and lubricating oil in the oil storage chamber is supplied to a lubrication necessary portion of the internal combustion engine via the suction pump. The oil reservoir chamber is arranged below the intermediate member carrying the oil, and the oil level gauge is inserted into the oil reservoir chamber through the insertion hole formed in the intermediate member.
Configuration. The present invention has a third configuration in which, in the second configuration, the intermediate member and the oil reservoir chamber extend rearward of the internal combustion engine in a top view. According to the present invention, in the first to third configurations, the oil reservoir is arranged below the cylinder head.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show a first embodiment, but there is no direct relationship between the first embodiment and the claims. As shown in FIG. 1, the outboard motor 10 has a clamp bracket 12 attached to a hull 11 and a tilt shaft 12 attached to the clamp bracket 12.
The swivel bracket 14 is tiltably supported via 13,
A swivel bracket (14) supports a propulsion casing (15) so that it can be steered via a steering shaft (not shown). Propulsion casing
A four-cycle internal combustion engine 17 is mounted on the upper portion of 15 via a plate-shaped intermediate member 16. 10A is a cowling.
The output of the internal combustion engine 17 is transmitted to the propeller shaft 20 via a drive shaft 18 and a forward / reverse switching gear train 19 that are vertically installed in the propulsion casing 15, and allows the propeller 21 to rotate forward or backward.

As shown in FIGS. 2 and 3, the internal combustion engine 17
A cycle four-cylinder internal combustion engine with a cylinder block 22;
Crank case 23, cylinder head 24 and head cover
25 forms the engine body. Cylinder block
Four cylinders are placed horizontally on 22 and a piston is installed in each cylinder.
26 are arranged so as to be able to reciprocate in the horizontal direction. The space formed by the cylinder block 22 and the cylinder head 24 on the top surface side of the piston 26 is a combustion chamber 27. A space defined by the cylinder block 22 and the crankcase 23 on the back side of the piston 26 is a crank chamber 28. Crank chamber 28
A crankshaft 29 supported vertically by a bearing portion formed on a mating surface portion of the cylinder block 22 and the crankcase 23 is vertically installed on the drive shaft 18.
The upper ends of are connected. Reference numeral 30 is a connecting rod that connects the piston 26 and the crankshaft 29.

A space defined by the cylinder head 24 and the head cover 25 is a cam chamber 31. A cam shaft 32 is vertically installed in the cam chamber 31, and upper and lower ends of the cam shaft 32 are supported by a cylinder head 24. In FIG. 3, 33 is an intake cam, 34 is an exhaust cam, and 35 is a rocker arm. Further, a belt 38 is wound around a drive wheel 36 provided at an end portion of the crank shaft 29 protruding from the crank chamber 28 and a driven wheel 37 provided at an end portion of the cam shaft 32 protruding from the cam chamber 31. The camshaft 32 is rotated once by rotating the crankshaft 29 twice to open and close an intake valve and an exhaust valve (not shown).

Here, since the internal combustion engine 17 constitutes a dry sump type lubricating device, as shown in FIGS. 1 to 3, the oil receiver 41 is provided in the intermediate member 16 located below the cylinder block 22.
And the oil tank 42 to the side or front of the crankcase 23.
The pump device 43 is arranged on the lower side surface of the. Oil pan
41 is set in the intermediate member 16 at a position close to the crankshaft 29. The cylinder block 22 has a crank chamber
An oil return path 44 extending from the oil reservoir 28 to the oil receiver 41 is formed, and a cam chamber is formed in the cylinder head 24 and the cylinder block 22.
An oil return path 45 extending from 31 to the oil receiver 41 is formed. The two oil return paths 44 and 45 meet at the upper part of the oil receiver 41 and communicate with the oil receiver 41 via a filtration and bubble separation screen 46 supported between the cylinder block 22 and the intermediate member 16. . In other words, the lubricating oil after lubricating each part of the engine that requires lubrication will return to the oil return path by natural fall.
After flowing down 44 and 45, they gather at the oil receiver 41 via the screen 46.

The oil tank 42 has an oil inflow path 47 and an oil outflow path 48, and a screen located at an intermediate portion in the tank above the suction port 48A of the oil outflow path 48.
Equipped with 49. The discharge port 47A of the oil inflow path 47 is set so as to project above the oil level in the tank, and is separated from the suction port 48A above the oil tank.
It is effective for gas-liquid separation of lubricating oil flowing out to 42. Further, the screen 49 is for filtering and separating bubbles, and prevents foreign matters and bubbles from flowing into the oil outlet passage 48 on the suction port side.
The oil tank 42 includes an oil inlet cap and an oil level gauge 50. Further, the oil tank 42 is provided with a communication pipe (air bleed pipe) 51 for allowing the air in the tank to escape to the upper space of the cam chamber 31 when the oil level in the tank or the pressure in the tank rises. A check valve 52 is provided at the connection portion of 51 to prevent oil leakage when the oil tank 42 falls due to tilting of the propulsion casing 15 (see FIG. 2B). Check valve 52
The valve opening pressure of is set by a spring.

The pump device 43 is, as shown in FIGS.
Installed around the lower end of the crankshaft 29, the oil transfer pump 53
The lubrication pump 54 and the lubrication pump 54 are provided in a two-tiered state in the pump body 43A, and the pump shaft 55 common to both is driven by the rotational force of the crankshaft 29. That is, a pump shaft drive shaft 56 is coupled to the pump shaft 55, a driven gear 57 is fixed to the pump shaft drive shaft 56, and the driven gear 57 meshes with a drive gear 58 provided on the crank shaft 29. ing. As shown in FIG. 4, the oil feed pump 53 has a suction port in which a suction passage 59 provided in the pump body 43A and the cylinder block 22 is continuous.
60 is opened in the oil receiver 41 and the pump body 43A
The discharge passage 61A provided in the cylinder block 22 communicates with the discharge passage 61B provided in the cylinder block 22. The discharge path 61B communicates with the oil inflow path 47 of the oil tank 42, and the lubricating oil in the oil receiver 41 is pressure-fed and supplied to the oil tank 42 by the rotation of the rotor 62 fixed to the pump shaft 55. At this time, a check valve 63 is provided in the discharge passage 61A in the pump body 43A to prevent the lubricating oil in the oil tank 42 from flowing back to the oil receiver 41 side when the outboard motor 10 is placed horizontally. ing. The valve opening pressure of the check valve 63 is set by a spring.

As shown in FIG. 5, the lubricating pump 54 has a suction passage 64 provided in the pump body 43A and the cylinder block 22.
Is communicated with an oil outflow passage 48 of the oil tank 42, and a discharge passage 65 provided in the pump body 43A is communicated with an oil supply passage 66 provided in the cylinder block 22 and the cylinder head 24. By the rotation of the rotor 67 fixed to the pump shaft 55, the lubricating oil in the oil tank 42 is pressure-fed to the oil feed passage 66 and supplied to the lubrication necessary parts of the engine (the crankshaft 29 bearing, the camshaft 32 bearing, etc.). . At this time, the discharge passage in the pump body 43A
A check valve 68 is provided on the valve 65 to prevent the lubricating oil fed to the oil feed passage 66 from flowing back to the rotor 67 side. Due to the valve closing pressure of the check valve 68 set by a spring, when the outboard motor 10 is placed sideways with the lubrication pump 54 stopped with the engine stopped, the oil tank 42 moves to the oil supply passage 66 side. Prevents the flow of lubricating oil in the forward direction.

As shown in FIG. 2, the oil passage 66 is connected to a discharge passage 65 of the lubrication pump 54 located below the cylinder block 22 and extends upward from the connection point. And a distribution-side oil supply passage 66B connected to the upper end of the pump-side oil supply passage 66A via an oil filter 69 and extending vertically from the oil filter 69.
It has a branch oil passage 66C that branches from each part of 66B and extends toward each lubrication necessary part of the engine. A transfer oil supply passage 66D is arranged between the bearing at the upper end of the crankshaft and the oil hole 32A of the camshaft 32. Lubricating oil in the uppermost branch oil supply passage 66C lubricates the crankshaft upper end bearing portion, the camshaft upper end bearing portion, the cam surface, the camshaft lower end bearing portion, and the like. A relief valve 70 for pressure adjustment is provided in the pump-side oil supply passage 66A to the oil filter 69, and the relief valve 70 releases the high pressure of the pump-side oil supply passage 66A to the crank chamber 28 so that the oil filter 69 is removed. Protect.

By reducing the amount of lubricating oil accumulated in the oil receiver 41 and increasing the amount of lubricating oil in the oil tank 42, it is possible to prevent poor lubrication during restart after tilting up and down. Can be. For this purpose, due to the pump performance of the lubricating pump for circulating the lubricating oil from the oil tank 42 to the oil receiver 41, the oil tank 41
It is necessary to improve the pump performance of the oil pump that returns the lubricating oil to 42. Further, since the lubricating oil on the oil receiver 41 side contains more air than the oil tank 42 side, it is necessary to further improve the pump performance. Therefore, the rotor thickness (capacity) of the oil feed pump 53 is made larger than the rotor thickness (capacity) of the lubrication pump 54. The air sent to the oil tank 42 by the oil feed pump 53 increases the tank internal pressure, and the air is discharged to the communication pipe 51 described above.

The outboard motor 10 has a drive shaft as shown in FIG.
A water pump 71 driven by 18 is built in the propulsion casing 15, and is driven in synchronization with the internal combustion engine 17.
The external water taken from the water intake 72 is supplied to the water jacket 74 of the internal combustion engine 17 through the water supply pipe 73.
Water cooling.

Next, the operation of the first embodiment will be described. In the first embodiment, the lubricating oil in the unsteady flow state in which the oil naturally returns from the lubrication-required portion of the internal combustion engine 17 to the oil return passages 44 and 45 entrains air in the unsteady flow process and has various sizes. It flows into the oil receiver 41 in a state containing air bubbles. At this time, in the first embodiment, the screen 46 is provided at the oil return port where the oil return paths 44 and 45 are connected to the oil receiver 41. Therefore, the foreign matter in the lubricating oil is, of course, captured by the screen 46, but the air bubbles entrained in the lubricating oil are also captured by the screen 46 in the process of gently falling through the oil port. Passage is prevented.

In the first embodiment, the oil receiver
A screen 49 was also provided in the middle part of the oil tank 42 located on the downstream side of 41. Therefore, even if air bubbles that cannot be caught by the screen 46 of the oil receiver 41 are sent to the oil tank 42, the air bubbles are caught by the screen 49 in the process of floating in the oil tank 42 and are prevented from passing therethrough. . Therefore, foreign matters and bubbles in the lubricating oil collected in the oil receiver 41 after lubricating the lubrication required part of the engine are reliably filtered and bubbles are separated, and the filtered and foamed lubricating oil is pumped by the pump device 43 to the engine. By re-supplying to the lubrication necessary part, stable lubrication performance can be secured. In addition,
Since the screen 46 is attached in a state of being held between the cylinder block 22 and the intermediate member 16, it is easy to attach.

FIGS. 6 and 7 show a second embodiment of the present invention. The second embodiment has a relationship with the claims. Outboard motor 11
6, a four-stroke internal combustion engine 113 is mounted on an upper part of a propulsion casing 111 via an intermediate member 112 as shown in FIG. The internal combustion engine 113 has two cylinders, but since the basic structure of each part of the engine is substantially the same as that of the internal combustion engine 17, the same functional parts as those of the internal combustion engine 17 are designated by the same reference numerals and the description thereof will be omitted. . The internal combustion engine 113 is substantially different from the internal combustion engine 17 in the following points.

That is, since the internal combustion engine 113 constitutes a dry sump type lubrication device, an oil receiver 114 is disposed on an intermediate member 112 located below the cylinder head 24 as shown in FIG. An oil tank (oil reservoir) 115 is arranged at the upper end on the side, and a pump device 116 is arranged at the lower end of the cam shaft 32. At this time, the oil receiver 114 is connected to the cam shaft 32 of the intermediate member 112.
The oil tank 115 is installed adjacent to the cylinder head 24 of the internal combustion engine 113 via the intermediate member 112.

The oil tank 115 is installed at a position near the camshaft 32 at the rear upper end of the propulsion casing 111, has an oil inflow pipe 117 and an oil outflow pipe 118 attached to the intermediate member 112, and has an oil outflow. Tube 11
A screen 119 is provided at an intermediate portion in the tank, which is higher than the suction port 118A. The oil tank 11
5 is oil inlet cap 120A and oil level gauge 12
It has 0. Intermediate member with internal combustion engine 113
The oil tank 115 is located below the
The oil level gauge 120 is inserted into an insertion hole formed in the oil level gauge 120, and an oil inlet cap 120A at the upper end of the oil level gauge 120 is attached to the oil inlet. The oil level gauge 120 is arranged rearward of the cylinder head 24 in a top view, and the intermediate member 112 and the oil tank 115 have an internal combustion engine 113.
Extends behind. Further, the oil tank 115 is provided with a communication pipe (air bleed pipe) 121 for allowing the air in the tank to escape to the cam chamber 31 when the oil level rises, and a connection portion of the communication pipe 121 to the cam chamber 31 Propulsion casing 11
A check valve 122 is provided in order to prevent oil leakage when the oil tank 115 falls down due to the tilting of 1. The opening pressure of the check valve 122 is set by a spring.

The pump device 116 is installed around the lower end of the camshaft 32 as shown in FIGS.
3 and a lubrication pump 124 are provided in a two-tiered state in the pump body 116A, and a pump shaft 125 common to both is directly connected to the lower end of the cam shaft 32. Oil pump 123 is the pump body
A suction port 127 of a suction passage 126 provided in 116A is opened to an oil receiver 114, and a discharge passage 128 provided in a pump body 116A, a cover 116B and an elastic seal member 134 is connected to an oil inflow pipe 117 of an oil tank 115. Communication, pump shaft
Rotor 129 fixed to 125
The 114 lubricating oil is pumped and supplied to the oil tank 115.

The lubricating pump 124 has a suction passage 13 provided in a pump body 116A, a cover 116B, and an elastic seal member 134.
0 is connected to the oil outflow pipe 118 of the oil tank 115, and the discharge passage 131 provided in the pump body 116A is provided in the cylinder block 22 and the cylinder head 24.
The lubricating oil in the oil tank 115 is pumped from the oil supply passage 132 by the rotation of the rotor 133 fixed to the pump shaft 125 to rotate the parts necessary for the engine lubrication (bearings of the crankshaft 29, bearings of the camshaft 32, etc.). ). A drain plug 115 A is provided below the oil tank 115. In addition, in FIG. 6, the middle portion of the cooling water supply pipe 73 is a thermal conductor. For example, an adhesive 134 containing a metal such as aluminum
At A, it is attached to the side wall of the oil tank 115 so that the lubricating oil in the oil tank 115 can be water-cooled. In FIG. 6, reference numeral 135 denotes an exhaust pipe.

Next, the operation of the second embodiment will be described. In the second embodiment, the oil tank 115 is disposed below the cylinder head 24 of the internal combustion engine 113, and the vertically disposed crankshaft 29 and the camshaft 32 are disposed in a front-rear relationship. An oil level gauge 120 is inserted into an oil tank 115 through an insertion hole formed in the intermediate member 112 behind the cylinder head 24, and the intermediate member 11
2 and an oil tank 115 extend behind the internal combustion engine 113. Therefore, the devices of the intake system and the exhaust system are mounted on the left and right sides of the internal combustion engine 113, and the oil level gauge 120 is inserted into the oil tank 115 from the rear side of the internal combustion engine 113.
The insertion hole of the oil level gauge 120 is
Since the oil level gauge 120 is formed at the portion of the intermediate member 112 extending rearward, the oil level gauge 120 can be inserted and mounted in a substantially vertical direction.

In the second embodiment, the oil return passages 44 and 45 are connected to the oil receiver 11 in substantially the same manner as in the first embodiment.
A screen 46 was provided at the oil return port connected to 4. Therefore, the foreign matter in the lubricating oil is, of course, captured by the screen 46, but the air bubbles entrained in the lubricating oil are also captured by the screen 46 in the process of gently falling through the oil return port. It is subdivided into smaller bubbles or disappears. Further, an oil screen 119 is provided at an intermediate portion of an oil tank 115 located downstream of the oil receiver 114. Therefore, even if air bubbles that could not be captured by the screen 46 of the oil receiver 114 are sent to the oil tank 115, the air bubbles are captured by the screen 119 and become smaller air bubbles while floating in the oil tank 115. It can be subdivided or eliminated. Therefore, foreign matter and air bubbles in the lubricating oil collected in the oil receiver 114 after lubricating the required parts of the engine are surely filtered and defoamed, and the filtered and defoamed lubricating oil is pumped by the pump device 116 to lubricate the engine. By recirculating to the part, stable lubrication performance can be secured.

FIG. 8 shows the third embodiment, but there is no direct relationship between the third embodiment and the claims. Outboard motor 150
Is substantially the same as the outboard motor 110 as shown in FIG.
The same functional portions as those in the outboard motor 110 are denoted by the same reference numerals, and description thereof will be omitted. This outboard motor 150 is
The internal combustion engine 113 employs a wet sump type lubrication device, and the return lubricating oil that falls from the oil return passage 151 that connects the crank chamber 28 and the cam chamber 31 to the lower portion of the intermediate member 112. The lubricating oil is received in an oil reservoir 152 provided, and this lubricating oil is supplied to a lubrication necessary portion of the internal combustion engine 113 by a lubrication pump 153 installed at the lower end of the cam shaft 32. Reference numeral 154 is a suction pipe. But oil reservoir
152 is provided with a screen 155 located in the middle portion of the tank above the suction port 154A of the suction pipe 154.

Next, the operation of the third embodiment will be described. In the third embodiment, it is a matter of course that the foreign matter in the lubricating oil is captured by the screen 155, but in the process of flowing from the lubrication necessary portion of the engine into the oil reservoir 152, The air bubbles entrapped are also captured by the screen 155 in the process of floating in the oil reservoir 152, and are subdivided into smaller air bubbles or eliminated. Therefore,
After lubricating the required portion of the engine, the foreign matter and bubbles in the lubricating oil collected in the oil reservoir 152 are surely separated, and the separated lubricating oil is supplied again to the required portion of the engine by the lubrication pump 153. Thereby, stable lubrication performance can be secured. When the present invention is applied to an outboard motor provided with a dry sump type lubricating device, the screen of the present invention only needs to be provided on at least one of the oil receiving side and the oil tank side.

[0026]

According to the first aspect of the present invention, in the lubricating device for a four-stroke outboard motor, the oil reservoir is disposed below the internal combustion engine, and the vertically disposed crankshaft and camshaft are in a front-rear relationship. And an oil level gauge inserted into the oil reservoir is disposed behind the cylinder head of the internal combustion engine when viewed from above. Since the oil level gauge is disposed behind the internal combustion engine in this manner, the intake system and the exhaust system can be compactly mounted on both left and right sides of the internal combustion engine. According to a second aspect of the present invention, the oil reservoir is disposed below the intermediate member on which the internal combustion engine is mounted, and the oil level gauge is inserted into the oil reservoir through an insertion hole formed in the intermediate member. Since the oil level gauge insertion hole is not formed in the side wall of the internal combustion engine body as described above, the strength of the internal combustion engine body can be sufficiently maintained and the safety of the internal combustion engine can be enhanced. Since the number of insertion holes is small, the structure is simpler than the conventional example in which the first insertion hole and the second insertion hole are inserted. According to the third aspect of the present invention, since the intermediate member and the oil storage chamber in the second aspect extend rearward of the internal combustion engine in a top view, when an insertion hole is formed in a portion extending rearward of the intermediate member, the insertion hole is formed. The oil reservoir is located just below the hole. Therefore, the oil level gauge can be inserted and mounted in the oil reservoir in a substantially vertical direction through the insertion hole. Therefore, the oil level gauge can be shortened and the oil level gauge can be downsized. Further, in claim 4 of the present invention, in each of the above-mentioned claims, since the oil reservoir is arranged below the cylinder head, the shape and position of the oil reservoir can be variously selected, and the oil capacity can be increased. Can be.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a four-cycle outboard motor to which Embodiment 1 is applied.

FIG. 2 is a partially broken side view showing the four-stroke internal combustion engine of FIG. 1;

FIG. 3 is a cross-sectional view showing the 4-cycle internal combustion engine of FIG.

4 is a cross-sectional view showing an oil feed pump system in the pump device of FIG.

5 is a cross-sectional view showing a lubricating pump system in the pump device of FIG.

FIG. 6 is a side sectional view schematically showing a four-cycle outboard motor to which Embodiment 2 of the present invention is applied.

7 is a cross-sectional view showing the pump device of FIG.

FIG. 8 is a side sectional view schematically showing a four-cycle outboard motor to which Embodiment 3 is applied.

[Explanation of symbols]

 24 Cylinder head 29 Crankshaft 32 Camshaft 110 Outboard motor 112 Intermediate member 113 Internal combustion engine 115 Oil tank (Oil reservoir) 116 Pump device (Suction pump) 118A Suction port 120 Oil level gauge

Claims (4)

[Claims] 1. A lubricating oil after lubricating a necessary portion of an internal combustion engine flows into an oil reservoir, a suction port of a suction pump is opened in the oil reservoir, and the oil reservoir is opened via the suction pump. Supply the lubricating oil to the necessary parts of the internal combustion engine,
In a four-stroke outboard motor lubrication system, an oil reservoir is disposed below an internal combustion engine, and a vertically disposed crankshaft and a camshaft are disposed in a front-rear relationship. A lubricating device for a four-cycle outboard motor, wherein a level gauge is disposed behind a cylinder head of an internal combustion engine when viewed from above. 2. Lubricating oil after lubricating a necessary portion of the internal combustion engine is allowed to flow into the oil reservoir, a suction port of a suction pump is opened in the oil reservoir, and the oil reservoir is opened via the suction pump. Supply the lubricating oil to the necessary parts of the internal combustion engine,
In a 4-cycle outboard motor lubrication device, an oil reservoir is arranged below an intermediate member carrying an internal combustion engine, and an oil level gauge is inserted into the oil reservoir through an insertion hole formed in the intermediate member. Lubricator for 4-cycle outboard motors characterized by 3. The lubrication device for a four-cycle outboard motor according to claim 2, wherein the intermediate member and the oil reservoir extend rearward of the internal combustion engine in a top view. 4. The lubricating device for a four-cycle outboard motor according to claim 1, wherein the oil reservoir is disposed below the cylinder head.