JP3859850B2 - Outboard motor lubricant cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a lubricating oil cooling device for an outboard motor.
[0002]
[Prior art]
Conventionally, as an outboard motor lubricating oil cooling device that cools the outer wall surface of an oil pan for storing lubricating oil of an outboard motor engine with cooling water, for example, (1) Japanese Unexamined Utility Model Publication No. 63-164508 “Lubricant oil cooling device for outboard motor” and (2) Japanese Patent Laid-Open No. 3-31094 “Outboard motor” are available.
[0003]
In the prior art (1), according to FIGS. 2 and 3 of the publication, the cooling water after cooling the engine is referred to the lubricating oil cooling water pipe 22 (numbers are those described in the publication. The same applies hereinafter). )) Is led to the outer wall surface of the lubricating oil reservoir 8, and the outer wall surface is water-cooled.
[0004]
According to FIG. 4 and FIG. 7 of the publication, the prior art of the above (2) guides the cooling water after cooling the engine to the cooling water passage 39 provided in the engine mount member 6. The outer wall surface of the oil pan 21 is water-cooled by dropping it to the periphery of the oil pan 21.
[0005]
[Problems to be solved by the invention]
However, the prior art (1) requires the lubricating oil cooling water pipe 22 and an attachment member such as a wall for attaching the injection port of the lubricating oil cooling water pipe 22 to the outer wall surface of the lubricating oil reservoir 8. is necessary. Moreover, in order to cool the lubricating oil reservoir 8 over a wide range, a large number of lubricating oil cooling water pipes 22 are required. This complicates the configuration of the outboard motor, increases the number of production steps, and increases the cost.
[0006]
On the other hand, the conventional technique (2) can cool a wider range than the conventional technique (1). However, since the cooling water is simply dropped from the plurality of holes 56 to the periphery of the oil pan 21, it is necessary to efficiently bring the cooling water that has spontaneously dropped or splashed by the exhaust gas into contact with the outer wall surface of the oil pan 21. It becomes. In order to make cooling water contact efficiently, the structure of a lubricating oil cooling device becomes complicated.
[0007]
Accordingly, an object of the present invention is to efficiently bring cooling water into contact with the outer wall surface of an oil pan with a simple configuration.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is an outboard motor in which the lubricating oil is cooled by cooling an oil pan for storing lubricating oil of a propeller driving engine with cooling water. Oite the lubricating oil cooling device, the cooling water induction portions for the cooling water guided toward the outer wall surface of the oil pan is formed integrally with the oil pan, the cooling water induction portions, from the outer wall surface of the oil pan The cooling water guiding portion is provided so as to protrude laterally and has a guiding hole penetrating vertically, and the guiding hole is an oblique opening toward the outer wall surface of the oil pan .
The cooling water guiding portion is provided so as to protrude laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically, and the guiding hole is an oblique opening toward the outer wall surface of the oil pan. Therefore, the cooling water is guided toward the outer wall surface of the oil pan. As a result, the cooling water guided by the cooling water guiding portion efficiently contacts the outer wall surface of the oil pan. Since the cooling water guiding part is formed integrally with the oil pan, there is no need to newly provide a cooling water guiding part made of a separate member.
[0009]
In the invention according to claim 2, the propeller driving engine is mounted on the mount case, the oil pan is mounted below the mount case, and the lubricating oil in the oil pan passes through a control valve for controlling the water temperature or water pressure. Oite the lubricating oil cooling system for an outboard motor which is adapted to cool the cooling water after the engine cooling, to the mount case, provided the water flow path for flowing cooling water, below the spillway, cooling water from the flowing water channel Is provided with a cooling water guiding portion for guiding the oil toward the outer wall surface of the oil pan , the cooling water guiding portion is provided so as to protrude laterally from the outer wall surface of the oil pan, and the cooling water guiding portion penetrates vertically A hole is provided, and the guide hole is an oblique opening toward the outer wall surface of the oil pan .
The cooling water guiding portion is provided so as to protrude laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically, and the guiding hole is an oblique opening toward the outer wall surface of the oil pan. Therefore, the cooling water after cooling the engine flowing down from the water flow path of the mount case is guided toward the outer wall surface of the oil pan. As a result, the cooling water guided by the cooling water guiding portion efficiently contacts the outer wall surface of the oil pan.
[0010]
The invention according to claim 3 attaches an extension case covering the oil pan to the lower surface of the mount case, and between the lower surface of the mount case and the upper surface of the extension case and between the lower surface of the mount case and the upper surface of the oil pan, The gasket is sealed with one gasket, the lower end opening of the water channel is closed with this gasket, and a hole is formed in the gasket for allowing cooling water to flow from the water channel to the cooling water guiding portion.
The configuration of the lubricating oil cooling device is simplified.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of an outboard motor according to the present invention. The outboard motor 1 includes a mount case (engine support case) 2 as an engine mounting member and a propeller that is mounted on the upper surface of the mount case 2 and bolted. The driving vertical multi-cylinder engine 3, an oil pan 4 that is bolted to the lower surface of the mount case 2 to store the lubricating oil of the engine 3, and bolted to the lower surface of the mount case 2 to cover the oil pan 4 and exhaust expansion An extension case 5 that forms a chamber, a vertical drive shaft 6 that is housed in the extension case 5 and transmits power from the engine 3, a gear case 7 that is attached to the lower part of the extension case 5, and a front and rear that is housed in the gear case 7 A bevel gear set (including a dog clutch device) 8 that performs forward switching, and this bevel gear set 8 The outboard motor body 1A consisting of the propeller 9 for rotation by binding to the power transmitted by one in which the outboard motor mounting means 11 through the mount rubber (not shown) and resiliently coupled.
[0012]
The outboard motor mounting means 11 is a metal fitting for fixing the outboard motor main body 1A to the hull S. The outboard motor main body 1A swings left and right in plan view around the swivel shaft 12, and the tilt shaft 13 is The outboard motor main body 1A including the swivel shaft 12 at the center can be flipped up in the clockwise direction.
The extension case 5 and the gear case 7 accommodate the cooling water screen 14, the cooling water supply pipe 15, the water pump 16, and the like.
[0013]
The outboard motor main body 1 </ b> A further includes a lower undercase 21 and an upper engine cover 22 that accommodate the engine 3, and an undercover 23 that covers the periphery of the mount case 2 and the upper periphery of the extension case 5 immediately below the undercase 21. With. Specifically, an undercase 21 is mounted on the upper portion of the mount case 2 and bolted, and an engine cover 22 is mounted on the upper portion of the undercase 21 and is detachably attached by an engagement / disengagement device 24. The upper part of the under cover 23 is bolted.
The undercase 21 and the engine cover 22 serve to form an engine room (engine housing case), and the undercover 23 serves as a decorative cover. Reference numeral 25 denotes an exhaust pipe.
[0014]
FIG. 2 is a longitudinal sectional view of a vertical type multi-cylinder engine according to the present invention.
The vertical type multi-cylinder engine 3 is composed of, for example, a water-cooled four-cycle four-cylinder engine. The vertical axis of a plurality of cylinders 31 (... indicates a plurality. The shaft 32 is oriented vertically, and the joint surface between the cylinder block 33 and the cylinder head 34 and the joint surface between the cylinder head 34 and the head cover 35 are substantially vertical surfaces. The engine 3 is arranged with the cylinder head 34 and the head cover 35 facing the rear of the outboard motor 1 (rear in the propulsion direction of the hull S shown in FIG. 1, ie, the left direction in this figure).
Reference numeral 36 denotes a crankcase bolted to the cylinder block 33, and 37... Are pistons housed in the cylinders 31.
[0015]
The crankshaft 32 has a first pulley 41, a second pulley 42 and a third pulley 43 attached to the upper part (one side of the engine 3) and a flywheel 45 with a ring gear 44 attached to the lower part (the other side of the engine 3). It is a thing.
The first pulley 41 drives a vertical camshaft 47 via a first belt 46, and the third pulley 43 drives an alternator 49 via a third belt 48. The flywheel 45 is connected to a starter motor (not shown) by a ring gear 44.
[0016]
The first belt 46, the second belt 51, and the third belt 48 are covered with a belt cover 52. The belt cover 52 has a ventilation port 52a at the top. The ventilation port 52 a ventilates the air in the belt cover 52 from the belt cover 52 to the outside of the engine cover 22.
By the way, the undercase 21 is fixed to the mount case 2 with a bolt 54 via an anti-vibration rubber 53.
In the figure, reference numeral 22a denotes an intake port at the top of the engine cover 22, 55 denotes an oil inlet, 56 denotes an oil filter, 57 denotes an intake silencer box, and 58 denotes a throttle valve device.
[0017]
FIG. 3 is a schematic diagram showing a cooling water path of a vertical type multi-cylinder engine according to the present invention, and is a diagram schematically showing a cooling water path composed of a cooling water jacket. In this figure, the vertical direction of the engine 3 is shown at the top and bottom of the figure.
The cooling water supply pipe 17 connected to the discharge side of the water pump 16 is connected to the cooling water path 60 of the engine 3 via the water supply path 4 w of the oil pan 4, the water supply hole 72 w of the gasket 72 and the water supply path 2 w of the mount case 2. It communicates.
The cooling water passage 60 includes a first cooling passage 61A, a second cooling passage 62A, a bypass passage 63, and a drainage passage 64. The first cooling passage 61 </ b> A is a passage formed of a cooling water jacket 61 (hereinafter referred to as “block side cooling water jacket 61”) of the cylinder block 33. The second cooling passage 62 </ b> A is a passage formed by a cooling water jacket 62 (hereinafter referred to as “head side cooling water jacket 62”) of the cylinder head 34. The drainage channel 64 is a channel for discharging the cooling water that has flowed through the first and second cooling channels 61A and 62A to the outside.
[0018]
The first cooling passage 61A communicates with the drainage channel 64 via the thermostat valve 65 and the drainage channel 64A downstream thereof, and the second cooling passage 62A communicates with the drainage channel 64 via the downstream drainage channel 64B and bypasses A path 63 is a path communicating with the drainage path 64 via a pressure control valve (relief valve) 66.
The thermostat valve 65 is a control valve that detects the water temperature (cooling water temperature) in the first cooling passage 61A and opens and closes the first cooling passage 61A. The opening degree changes according to the water temperature and the amount of water (cooling water) The water temperature is controlled by controlling the flow rate). The pressure control valve 66 is a control valve that opens and closes the bypass passage 63 by detecting the water pressure (cooling water pressure) in the bypass passage 63. When the water pressure in the block head side cooling water jackets 61 and 62 and the bypass passage 63 exceeds a predetermined level, the pressure control valve 66 is opened to release the excessive water pressure.
In the figure, 33a... Is a wall portion for forming the cooling water passage 60, 33b is a block side exhaust passage, and 67 is a gasket of a mating surface between the cylinder block 33 and the cylinder head.
[0019]
By the way, the mount case 2 has a configuration in which a flow channel 71 for flowing the cooling water flowing down from the drain channel 64 through the drain channel 64C is provided, and a lower end opening of the flow channel 71 is closed by a gasket 72. The cooling water in the flowing water passage 71 flows down from the hole (flowing water hole) 72 a of the gasket 72, is guided by the cooling water guiding portion 73, and is guided toward the outer wall surface 4 b of the oil pan 4.
The drainage channel 64 </ b> C is a drainage channel provided in the mount case 2. Details of the water flow path 71, the gasket 72, and the cooling water guiding portion 73 will be described later.
[0020]
FIG. 4 is a block diagram of a vertical type multi-cylinder engine according to the present invention, and is a view of the vertical type multi-cylinder engine 3 shown in FIG.
In the cooling water path 60 shown in FIG. 3, the engine 3 has a thermostat valve 65 attached to the upper surface of the cylinder block 33, and approaches the thermostat valve 65, and a pressure control valve 66 is attached to the upper side of the cylinder block 33. It is a thing. Since the thermostat valve 65 is disposed above, the pressure control valve 66 can be attached to the upper part of the side surface of the cylinder block 33.
[0021]
Specifically, a part of the first cooling passage 61A, a bypass passage 63, and a drainage passage 64 are provided on the side (front side) of the cylinder block 33, and these water passages 61A, 63, 64 are closed with a lid 68. It is.
In this figure, the cooling water flowing down from the lower part of the drainage channel 64 flows through the flowing water channel 71 (see FIG. 3) in the mount case 2 toward the outer wall surface of the oil pan 4. Indicates.
The engine 3 includes a washing water inlet 81 for washing the inside of the cooling water passage 60 with washing water, a hose 82, a one-way valve 83, and the like. The one-way valve 83 is attached to the cylinder head 34.
In the figure, 84 is a starter motor, 85 is an electrical box, 86...
[0022]
FIG. 5 is a side cross-sectional view of the lubricating oil cooling device for an outboard motor according to the present invention, and shows the engagement of the mount case 2, gasket 72, oil pan 4, and extension case 5.
The mount case 2 is formed integrally with a downwardly opened water channel 71. Also, (1) between the inner peripheral lower surface (inner gasket surface) 2a of the mount case 2 and the upper surface (upper gasket surface) 4a of the oil pan 4, and (2) outer peripheral lower surface (outer gasket surface) of the mount case 2 The space between 2b and the upper surface (upper gasket surface) 5a of the extension case 5 is sealed with one gasket 72, and the gasket 72 closes the lower end opening of the water flow channel 71.
On the other hand, the oil pan 4 is integrally formed with a cooling water guiding portion 73 for guiding the cooling water W from the flowing water channel 71 toward the outer wall surface 4 b of the oil pan 4 below the flowing water channel 71. .
Further, the gasket 72 has a hole 72 a for allowing the cooling water W to flow from the flowing water passage 71 to the cooling water guiding portion 73.
[0023]
The cooling water guiding portion 73 is a member that protrudes laterally from the outer wall surface 4 b of the oil pan 4, and this member is formed by opening a guiding hole 73 a penetrating vertically. The upper opening 73 b of the guide hole 73 a is larger than the hole 72 a in order to take in all the cooling water W that has flowed down from the hole 72 a of the gasket 72. The lower opening 73 c of the guide hole 73 a is an obliquely downward opening toward the outer wall surface 4 b in order to guide the cooling water W toward the outer wall surface 4 b of the oil pan 4. 73d is a guide wall for guiding the cooling water W.
Note that the position and size of the hole 72a are set so as not to be disengaged from the upper opening 73b even if the gasket 72 is attached with a slight shift.
[0024]
FIG. 6 is a side view of the oil pan according to the present invention, and shows that a plurality of cooling water guiding portions 73 are provided on the outer wall surface 4b of the oil pan 4 at a position slightly lower than the upper surface 4a. The cooling water W that has been guided and flowed down by the cooling water guiding portions 73... Flows along the outer wall surface 4 b while diffusing. For this reason, the cooling water W can be efficiently contacted with the outer wall surface 4b.
4c is a drain opening.
[0025]
FIG. 7 is a plan view of the oil pan according to the present invention, and shows that six cooling water guiding portions 73 are arranged on the outer wall surface 4 b of the oil pan 4.
The oil pan 4 is provided with a water supply path 4w at the upper part and a cooling water supply pipe 17 connected to the lower part of the water supply path 4w. In other words, the upper surface 4a of the oil pan 4, that is, the upper flange is partially extended, a water supply path 4w is formed in the extended portion, and the cooling water supply pipe 17 is connected to the water supply path 4w. 4d is an exhaust passage, 4e ... is a bolt insertion hole.
[0026]
FIG. 8 is a plan view of the gasket according to the present invention, and shows that an oil pan is disposed on the lower surface (the rear surface in the figure) of the gasket 72. That is, this figure shows the relationship between the lower surface of the gasket 72 and the upper surface 4a of the oil pan indicated by a broken line, the relationship between the upper surface (the surface in the figure) of the gasket 72 and the outer peripheral lower surface 2b of the mount case indicated by an imaginary line. The relationship between the holes 72a and the cooling water guiding portions 73 is shown.
The holes 72a are elongated holes along the outer wall surface 4b of the oil pan 4 (see FIG. 5). The gasket 72 has a plurality of water supply holes 72w as shown in the figure, and communicates with a water supply path 4w of the oil pan 4 indicated by a broken line. This figure also shows the positional relationship of the drainage channel 64C with respect to the gasket 72.
[0027]
72b is a bolt insertion hole, 72c is a lubricating oil flow hole from the engine crank chamber, 72d is a lubricating oil flow hole from the engine cam chamber, 72e is a vertical drive shaft hole, and 72f is an exhaust hole (exhaust gas flow hole). ), 72 g... Are gas silencing holes through which the exhaust gas that has risen passes.
Reference numerals 2 c and 2 d indicated by imaginary lines are partition walls provided at the lower part of the mount case 2. By these partition walls 2c and 2d, the mount case 2 is partitioned into a flowing water passage 71 (see FIG. 5) on the right half of the figure and an exhaust gas ascending passage on the left half of the figure, and its specific configuration is well known. The description is omitted.
[0028]
Next, the operation of the lubricating oil cooling device having the above configuration will be described with reference to FIGS. In FIG. 3, the cooling water flows into the cooling water path 60 through the cooling water screen 14 → the cooling water supply pipe 15 → the water pump 16 → the cooling water supply pipe 17 → the water supply path 4w → the water supply hole 72w → the water supply path 2w. Then, the engine 3 is cooled. The cooling water after cooling the engine flows down the path of the drainage channel 64 → flow channel 71 → hole 72a, is guided by the cooling water guiding unit 73, flows along the outer wall surface 4b while diffusing, and the oil pan 4 Cool down. As the oil pan 4 is cooled, the lubricating oil is also cooled.
[0029]
In FIG. 5, the cooling water guiding part 73 takes in the cooling water W flowing down from the hole 72a of the gasket 72 from the upper opening 73b, guides it with the guiding wall 73d, and flows it out from the lower opening 73c toward the outer wall surface 4b. . Thus, the cooling water W flowing down from the flowing water channel 71 can be reliably guided toward the outer wall surface 4 b of the oil pan 4 by the cooling water guiding portion 73. The cooling water W that has flowed out flows along the outer wall surface 4 b and cools the oil pan 4. Therefore, the cooling water W can be efficiently brought into contact with the outer wall surface 4b of the oil pan 4.
[0030]
In the embodiment of the present invention, the shape, size, quantity, and arrangement of the cooling water guiding portion 73 are arbitrary. For example, it can also be set as the structure of the modification shown in FIG.9 and FIG.10.
FIG. 9 is a side cross-sectional view of the outboard motor lubricating oil cooling device (modified example) according to the present invention, and the cooling water guiding portion 74 of the lubricating oil cooling device is composed of fins formed integrally with the oil pan 4, The fin is a member that is inclined obliquely downward toward the outer wall surface 4 b in order to guide the cooling water W flowing down from the hole 72 a toward the outer wall surface 4 b of the oil pan 4.
[0031]
FIG. 10 is a side view of an oil pan (modification) according to the present invention, and shows that the cooling water guiding portion 74 made of fins is inclined along the outer wall surface 4 b of the oil pan 4.
The cooling water guiding portion 74 having such a configuration guides the cooling water W toward the outer wall surface 4b of the oil pan 4 and guides it along the outer wall surface 4b. According to this modification, the configuration of the cooling water guiding portion 74 can be further simplified.
[0032]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, there is provided a lubricating oil cooling device for an outboard motor in which the lubricating oil is cooled by cooling an oil pan for storing lubricating oil of a propeller driving engine with cooling water. A cooling water guiding portion for guiding water toward the outer wall surface of the oil pan is formed integrally with the oil pan, the cooling water guiding portion is provided so as to protrude laterally from the outer wall surface of the oil pan, and Since the water guide part has a guide hole penetrating vertically, and the guide hole is an oblique opening toward the outer wall surface of the oil pan, a cooling water guide part for guiding the coolant toward the outer wall surface of the oil pan is provided. It is not necessary to newly provide a cooling water guiding portion formed integrally with the oil pan and made of a separate member. For this reason, while being able to simplify the structure of a lubricating oil cooling device, cost reduction can be aimed at. In addition, the cooling water guiding portion formed integrally with the oil pan is provided so as to protrude laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically. by opening a of oblique toward the outer wall surface of the cooling water so directs toward the outer wall surface of the oil pan, it can be efficiently contacted with the cooling water on the outer wall surface of the oil pan.
[0033]
In the invention according to claim 2 , the propeller driving engine is mounted on the mount case, the oil pan is mounted below the mount case, and the lubricating oil in the oil pan passes through a control valve for controlling the water temperature or water pressure. In the lubricating oil cooling system for an outboard motor that is cooled by the cooling water after cooling the engine , a flow channel for flowing the cooling water is provided in the mount case, and the cooling water from the flowing water channel is oiled below the flowing water channel. A cooling water guiding part is provided for guiding toward the outer wall surface of the pan , the cooling water guiding part is provided so as to protrude laterally from the outer wall surface of the oil pan, and the cooling water guiding part has a guide hole penetrating vertically. Since the guide hole is an oblique opening toward the outer wall surface of the oil pan,
1) By passing the cooling water through the cooling passage opened and closed by the control valve, it is possible to cool the lubricating oil in the oil pan according to the cooling state of the required part of the engine,
2) Further , the cooling water flowing down from the water flow path is provided with a cooling water guiding portion projecting laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically. The slanted opening toward the outer wall surface of the oil pan can reliably guide the cooling water toward the outer wall surface of the oil pan.
3) For this reason, the cooling water can be efficiently brought into contact with the outer wall surface of the oil pan. Moreover, the configuration of the lubricating oil cooling device can be simplified.
[0034]
The invention according to claim 3 attaches an extension case covering the oil pan to the lower surface of the mount case, and between the lower surface of the mount case and the upper surface of the extension case and between the lower surface of the mount case and the upper surface of the oil pan, Sealed with one gasket, and the gasket closed the lower end opening of the water flow channel. Furthermore, a hole was formed in the gasket to allow cooling water to flow from the water flow channel to the cooling water guiding portion. Can be easy.
[Brief description of the drawings]
FIG. 1 is a side view of an outboard motor according to the present invention. FIG. 2 is a side sectional view of a vertical multi-cylinder engine according to the present invention. FIG. 3 shows a cooling water path of the vertical multi-cylinder engine according to the present invention. Schematic diagram [FIG. 4] Configuration diagram of a vertical type multi-cylinder engine according to the present invention [FIG. 5] Side sectional view of a lubricating oil cooling device for an outboard motor according to the present invention [FIG. 6] Side view of an oil pan according to the present invention FIG. 7 is a plan view of an oil pan according to the present invention. FIG. 8 is a plan view of a gasket according to the present invention. FIG. 9 is a side cross-sectional view of a lubricating oil cooling device (modified example) for an outboard motor according to the present invention. FIG. 10 is a side view of an oil pan (modification) according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 2 ... Mount case, 3 ... Engine for propeller drive (vertical type multi-cylinder engine), 4 ... Oil pan, 4b ... Outer wall surface, 5 ... Extension case, 9 ... Propeller, 61A ... Cooling passage (No. 1 cooling passage), 64 ... drainage channel, 65 ... control valve (thermostat valve) for controlling water temperature, 66 ... control valve (pressure control valve) for controlling water pressure, 71 ... flow channel, 72 ... gasket, 72a ... hole ( Flowing water holes), 73, 74 ... cooling water guiding part, W ... cooling water.

Claims (3)

Oite the oil pan for storing the lubricating oil of the propeller drive engines, by cooling with cooling water, the lubricating oil cooling system for an outboard motor which is adapted to cool the lubricating oil,
The cooling water induction portion for guiding towards the cooling water to the outer wall surface of the oil pan is formed integrally with the oil pan,
The cooling water guiding portion is provided to project laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically, and the guiding hole is inclined toward the outer wall surface of the oil pan. Is an opening,
Lubricating oil cooling system for an outboard motor, characterized in that. A propeller drive engine is mounted on the mount case, an oil pan is mounted below the mount case, and the lubricating oil in the oil pan is cooled with cooling water after cooling the engine that has passed through a control valve that controls the water temperature or water pressure. Oite the lubricating oil cooling system for an outboard motor which is adapted to,
The mount case is provided with a flow channel for flowing the cooling water, and a cooling water guide part for guiding the cooling water from the flow channel toward the outer wall surface of the oil pan is provided below the flow channel ,
The cooling water guiding portion is provided to project laterally from the outer wall surface of the oil pan, and the cooling water guiding portion includes a guiding hole penetrating vertically, and the guiding hole is inclined toward the outer wall surface of the oil pan. Is an opening,
Lubricating oil cooling system for an outboard motor, characterized in that.   An extension case that covers the oil pan is attached to the lower surface of the mount case, and the gasket is sealed with a gasket between the lower surface of the mount case and the upper surface of the extension case and between the lower surface of the mount case and the upper surface of the oil pan. 3. The outboard as claimed in claim 2, wherein the gasket closes a lower end opening of the water flow channel, and further has a hole in the gasket for allowing cooling water to flow from the water flow channel to the cooling water guiding portion. Machine lubricating oil cooling device.

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