JPH0826188A - Outboard motor - Google Patents

Abstract

PURPOSE:To reduce the number of part items in minimizing the required number of gaskets by coupling a casing and an engine mount member as well as this engine mount member and an oil pan on the same plane via each common gasket. CONSTITUTION:An engine mount member 6 and an extension case 5 as well as this engine mount member 6 and an oil pan 21 are coupled respectively on the same plane, while the extension case 5 and the oil pan 21 plus the engine mount member 5 are coupled with one another by way of interposing each common gasket 27 among them. In brief, an oil pan coupling connecting cylindrical part 28 corresponding to an upper opening edge of the oil pan 21 and an extension case coupling connecting cylindrical part 29 to carry out its coupling with the extension case 5 both are installed in a lower part of the engine mount member 6, and in this case, the extension case coupling connecting cylindrical part 29 is surrounding the counterpart 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing containing a driving force transmitting means, a propeller connected to the driving force transmitting means and supported at a lower end of the casing, and an engine mount member coupled to an upper end of the casing. The present invention relates to an outboard motor including: an engine mounted on an engine mount member, the engine being coupled to a driving force transmission means; and an oil pan coupled to a lower end of the engine mount member in a casing.

[0002]

2. Description of the Related Art Conventionally, such an outboard motor is disclosed in Japanese Patent Laid-Open No. 58-4.
It is known from, for example, Japanese Patent No. 3897.

[0003]

By the way, in the above-mentioned conventional one, between the engine mount member and the oil pan,
In addition, since gaskets, which are separate members, are respectively interposed between the engine mount member and the casing, it cannot be said that the number of parts is small.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an outboard motor in which the number of required gaskets is minimized and the number of parts is reduced.

[0005]

According to the first aspect of the present invention,
A casing containing a driving force transmitting means, a propeller connected to the driving force transmitting means and supported at a lower end of the casing, an engine mount member coupled to an upper end of the casing, and an engine connected to the driving force transmitting means. In an outboard motor including an engine mounted on a mount member and an oil pan coupled to a lower end of the engine mount member within the casing, the casing, the engine mount member, and the engine mount member and the oil pan have a common gasket. It is characterized in that they are coupled on the same plane with the intervening.

The invention according to claim 2 is the above-mentioned claim 1.
In addition to the configuration of the described invention, the engine mount member is provided with an exhaust passage that guides exhaust gas from the engine to an opening on a coupling surface to the oil pan of the engine mount member,
The oil pan is provided with an exhaust passage for guiding the exhaust gas from the exhaust passage into the casing, and an opening is provided in a coupling surface of the oil pan to the engine mount member. The gasket has an opening for communicating the exhaust passages with each other. Is provided.

According to a third aspect of the invention, in addition to the configuration of the second aspect of the invention, the casing is provided with an inner wall located between the rear outer wall of the casing and the oil pan, and the casing and the engine mount member. Binding surface of
And a partition wall joined to the inner wall through the gasket on the same plane as the coupling surface of the engine mount member and the oil pan, an exhaust silencer chamber that communicates the inside of the engine mount member with the casing, and an exhaust gas provided in the rear portion of the casing. It is characterized in that it is provided in the engine mount member so as to be divided into an exhaust noise suppression chamber that communicates with the mouth, and that the partition wall is provided with guide holes that connect the exhaust noise suppression chambers on both sides thereof.

Further, in addition to the constitution of the invention described in claim 1, 2 or 3, the invention as set forth in claim 4 is such that the oil pan has a recess connected to a cooling pump arranged in a lower portion of the casing. Is provided so as to open on the coupling surface of the oil pan to the engine mount member, and a water rising passage for guiding cooling water to the engine is provided at the engine mount member so as to open on the coupling surface of the engine mount member to the oil pan. The
The gasket is characterized by being provided with an opening for communicating the recess and the water rising passage with each other.

[0009]

According to the structure of the invention described in claim 1, the casing and the engine mount member, and the engine mount member and the oil pan are coupled on the same plane, whereby the engine mount member is coupled to the casing and the oil pan. Since the common gasket is interposed between the casing and the engine mount member and between the engine mount member and the oil pan, the number of gaskets can be minimized.

Further, according to the configuration of the invention described in claim 2, it is not necessary to specially provide a gasket for sealing the connecting portion between the exhaust passage of the engine mount member and the exhaust passage of the oil pan.

According to the configuration of the invention described in claim 3,
The exhaust gas introduced into the casing can be inverted and raised to the engine mount member side above the casing and discharged from the exhaust port through both exhaust muffling chambers, and when the guide hole is circulated between both exhaust muffling chambers. It is possible to obtain a sound deadening effect due to the throttling and expansion action of. Further, since the inner wall and the partition wall are joined via the gasket, the joint surface of the inner wall and the partition wall is not exposed to the exhaust gas, and the problem such as corrosion due to the exhaust gas does not occur on the joint surface.

Further, according to the structure of the invention described in claim 4, it is not necessary to specially provide a gasket for sealing the connecting portion between the concave portion of the oil pan and the water rising passage of the engine mount member.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 showing an embodiment of the present invention, a casing 1 is attached to a stern plate of a hull (not shown) through supporting means 2, and an engine is mounted on the upper portion of the casing 1. E is installed and the engine E
Is transmitted to the propeller 4 supported on the lower portion of the casing 1 via the driving force transmitting means 3 incorporated in the casing 1.

Referring to FIGS. 3 and 4 together, the casing 1 includes an extension case 5 extending vertically.
The engine body 8 of the engine E is coupled to the engine mount member 6 that is coupled to the lower end of the extension case 5 and the gear case 7 that is coupled to the upper end of the extension case 5. Moreover, the engine mount member 6 and the upper part of the casing 1, that is, the upper part of the extension case 5 are covered with a cover 9, and a cover 12 composed of an engine lower cover 10 and an engine upper cover 11 is provided at the upper end of the cover 9.
Are connected to cover.

The engine E is, for example, a 3-cylinder 4-cycle engine, and the engine body 8 has a crankshaft 1
3 is mounted vertically on the engine mount member 6.

The driving force transmission means 3 is the crankshaft 13
A drive shaft 14 which has an axis line at a position decentered from the axis line and extends vertically in the casing 1, and the drive shaft 14
A gear train 15 for interlocking and connecting the upper end of the crankshaft 13 and the crankshaft 13, a pinion shaft 16 coaxially connected to the lower end of the drive shaft 14, and a rotary shaft 17 connected to the propeller 4 and the pinion shaft 16. The bevel gear mechanism 18 includes a bevel gear mechanism 18 and a bevel gear mechanism 18. Thus, the gear train 15 is housed and arranged between the engine mount member 6 as a primary gear case and the engine body 8. The drive shaft 14 has an upper end rotatably supported by the engine mount member 6 and a lower end rotatably supported by the gear case 7, and the pinion shaft 16 and the bevel gear mechanism 18 are provided in the gear case 7. It is stored and arranged.

Referring to FIGS. 5 and 6 together, an oil pan 21 for storing lubricating oil is coupled to the lower portion of engine mount member 6. The lubricating oil in the oil pan 21 is supplied to the oil strainer 2 by an oil pump (not shown) driven by the cam shaft or the crank shaft 13.
2 is pumped through and supplied to each lubrication part of the engine E. Moreover, the lubricating oil from each lubrication unit is supplied from the lower portion of the engine body 8 via the engine mount member 6 to the oil pan 2
Returned to 1. That is, at the lower end of the engine body 8, an engine mount member coupling connecting tubular portion 23 for accommodating the gear train 15 and coupling with the engine mount member 6 is provided, and at the upper portion of the engine mount member 6, An engine body coupling coupling tubular portion 24 is provided so as to be coupled to the lower end surface of the coupling tubular portion 23. Moreover, the upper surface of the engine mount member 6 is provided with a dish portion 25 having the connecting cylinder portion 24 as a peripheral wall, and the lubricating oil from each lubricating portion of the engine E is coupled to the engine mount member at the lower portion of the engine body 8. After being collected in the connecting cylinder part 23 for
It flows down to the plate portion 25. Further, the engine mount member 6 is provided with an oil passage 26 that opens to the deepest part of the pan portion 25 and extends downward and opens above the oil pan 21, and the lubricating oil that has flowed down to the pan portion 25 is the oil passage 26. Returned to the oil pan 21.

At the lower end of the extension case 5,
A cooling water pump 30 rotatably driven by a drive shaft 14 is arranged on the gear case 7, and water introduced through a filter 31 is pumped up by the cooling water pump 30 and is supplied to the cooling water pump 30. Water supply pipe 3 connected and extending upward
2 is supplied to the cooling water jacket 33 of the engine body 8 through the oil pan 21 and the engine mount member 6.

That is, the engine body 8 has a piston 34.
Are vertically slidably fitted in three cylinders 35, and a cooling water jacket 33 is provided in the engine body 8 so as to surround the cylinders 35. An inlet 36 for guiding the cooling water rising in the engine mount member 6 to the cooling water jacket 33 is provided on the lower surface of the engine body 8, and the cooling water discharged from the engine body 8 is mounted on the engine mount. A lead-out port 37 leading out to the member 6 side is provided adjacent to the introduction port 36. Moreover, at the upper end of the cooling water jacket 33, the thermostat valve 3 that operates according to the cooling water temperature is provided.
8 is provided, and the cooling water jacket 33 is connected to the cooling water passage 39 provided in the engine body 8 in series with the outlet 36 through the thermostat valve 38.

At the upper end of the oil pan 21, there is provided an outer edge portion which extends a part of the joint with the engine mount member 6 to the side, and the water supply pipe 3 is provided at this outer edge portion.
A recess 43 having a connection port 42 for connecting the upper ends of the two at the lower closed end is provided so as to open upward. Further, the engine mount member 6 is provided with a water ascending passage 44 connecting the recess 43 and the inlet 36 of the engine body 8, and a water descending passage 45 leading to the outlet 36 of the engine body 8. Drilled.

On the other hand, the engine body 8 is provided with an exhaust passage 46 for leading out exhaust gas, and an exhaust passage 47 communicating with the exhaust passage 46 is formed in the engine mount member 6 so as to extend vertically and further. The exhaust passage 4 communicating with the exhaust passage 47 also at the outer edge portion at the upper end of the oil pan 21.
An exhaust pipe 8 extends vertically and is drilled. An exhaust pipe 49 extending downward in the extension case 5 is connected to the exhaust passage 48. Thus, the exhaust gas discharged from the engine E is discharged into the extension case 5. Moreover, the extension case 5 has a low speed operation exhaust port 5 for discharging exhaust gas into the atmosphere during low speed operation.
0 is provided on the rear side at a position above the water surface,
An exhaust port 41 for high-speed operation, which discharges exhaust gas into the water during high-speed operation, is opened in the gear case 7 rearward at a position above the propeller 4.

That is, the exhaust gas pressure in the extension case 5 and the gear case 7 changes according to the operating state. Since the exhaust gas pressure is relatively low during low speed operation, the water surface in the casing 1 is higher than the exhaust port 41 for high speed operation. The exhaust gas is in the upper position, and the exhaust gas is in the upper exhaust port 5 for low speed operation.
0 is discharged into the atmosphere and the exhaust gas pressure is relatively high during high speed operation, so the water surface in the casing 1 is located below the high speed operation exhaust port 41, and the exhaust gas is discharged into the water from the high speed operation exhaust port 41. Will be done.

Referring also to FIG. 7, the engine mount member 6 and the extension case 5, and the engine mount member 6 and the oil pan 21 are joined together in the same plane. The engine mount member 6 is coupled to each other with a common gasket 27 interposed therebetween. That is, in the lower part of the engine mount member 6, the oil pan connecting connection cylinder portion 28 corresponding to the upper opening edge of the oil pan 21 and the extension case connecting connection cylinder portion 2 for performing the connection with the extension case 5.
9, the extension case coupling connecting tubular portion 29 is formed so as to surround the oil pan coupling connecting tubular portion 28, and the lower end surfaces of both the coupling tubular portions 28, 29, that is, the coupling surfaces 28a, 29a. Are formed on the same plane. Thus, the gasket 27 is formed in a flat plate shape with the outer periphery of the extension case coupling connection tubular portion 29 as the outer peripheral edge and the inner periphery of the oil pan coupling connection tubular portion 28 as the inner peripheral edge. An opening 51 for communicating the recess 43 and the water rising passage 44 of the engine mount member 6 with the exhaust passage 4 of the engine mount member 6.
7 and the opening 52 for communicating the exhaust passage 48 of the oil pan 21.

Therefore, the lubricating oil drops from the engine mount member 6 into the oil pan 21, the cooling water rises from the outer edge of the oil pan 21 to the engine mount member 6, and the exhaust gas from the engine mount member 6 to the oil pan 21. The flow to the outer edge portion is freely performed via the gasket 27, but the cooling water flowing downward in the water descending passage 45 provided in the engine mount member 6 is moved to the oil pan 21 side by the gasket 27. Distribution will be blocked. As a result, the gasket 27 becomes
It also functions as a cooling water guide member that forms a cooling water passage 55 that guides the cooling water that flows down from the downstream side with the engine mount member 6.

That is, in the engine mount member 6, the water descending passage 45 is arranged so as to open between the oil pan coupling connecting tubular portion 28 and the extension case coupling connecting tubular portion 29. In order to define the region including the opening as one section, a pair of partition walls 53 and 54 are provided between the oil pan coupling connecting tubular portion 28 and the extension case coupling connecting tubular portion 29. Therefore, the connecting cylinder part 28 for connecting the oil pan, the connecting cylinder part 29 for connecting the extension case, the both partition walls 5
3, 54 and gasket 27 allow oil pan 21
The cooling water passage 55 is formed at a position outside the upper open end of the cooling water passage 55. Moreover, in the portion corresponding to the cooling water passage 55, the gasket 27 is provided with a plurality of holes 56 forming cooling water discharge means.

Referring again to FIG. 3 again, at the rear portion of the extension case 5, an inner wall 5a extending inward of the outer wall and upward of the oil pan 21 is provided.
Is provided, and a partition wall 57 that is in contact with the upper end of the inner wall 5a via the gasket 27 on the same plane as the coupling surface of the extension case 5 and the oil pan 21 to the engine mount member 6 is an oil pan in the engine mount member 6. It is provided so as to extend between the coupling connection tubular portion 28 and the extension case coupling connection tubular portion 29. Thereby, the engine mount member 6 and the gasket 2
A first exhaust noise suppression chamber 58 is defined by partition walls 53, 54 and 57 in a portion of the chamber defined between 7 except the cooling water passage 55, and the partition wall 57 and the extension case coupling connection. The second exhaust silencing chamber 5 is provided between the tubular portions 29.
9 are defined. In addition, the rear outer wall of the extension case 5, the inner wall 5a and the gasket 27 allow the third
The exhaust muffling chamber 60 is defined, and the exhaust port 50 for low speed operation is connected to the third exhaust muffling chamber 60 to extend the extension case 5.
It is provided on the rear outer wall.

In the gasket 27, a large number of exhaust gas introduction holes 61 are formed in a portion corresponding to the first exhaust sound deadening chamber 58 so as to guide the exhaust gas discharged from the exhaust pipe 49 into the extension case 5 to the first exhaust sound deadening chamber 58. Is done and second
In order to guide the exhaust gas from the exhaust muffling chamber 59 to the third exhaust muffling chamber 60, a large number of exhaust derivation holes 62 are formed in the portions corresponding to the second and third exhaust muffling chambers 59, 60. Also, the partition wall 57
A large number of guide holes 63 (see FIG. 3) are formed in the first exhaust muffling chamber 58 to guide the exhaust gas to the second exhaust muffling chamber 59.

Referring also to FIG. 8, the support means 2 includes a stern bracket 65 attached to the stern plate of the hull,
A swivel case 66 that is tiltably connected to the stern bracket 65, a swivel shaft 67 that is rotatably supported by the swivel case 66, and a swivel shaft 67.
Upper support arm 68 provided on the upper part of the swivel shaft 67
Lower support arm 69 provided on the lower part of the
And a pair of elastic members 70 connecting the engine mount members 6 and a pair of elastic members 71 connecting the lower support arm 69 and the extension case 5.

The stern bracket 65 has a swivel case 6 for tilting the swivel case 66.
A cylinder 72 connected to 6 is clevis-supported.

The upper support arm 68 is formed so that the tip side is bifurcated, and the support means 2 of the engine mount member 6 is fixedly fitted to the elastic members 70 attached to the tip ends of the upper support arms 68. A pair of fitting recesses 73 is provided on the side surface on the side.

To explain the operation of this embodiment, the cooling water supplied from the cooling water pump 30 to the engine E is guided to the water descending passage 45 from the cooling water passage 39 after cooling the engine body 8. Engine mount member 6
Water is then sent to the cooling water passage 55 formed between the gaskets 7. Therefore, the relatively high temperature lubricating oil returning from the engine E to the oil pan 21 is cooled by the engine mount member 6 which comes into contact with the lubricating oil on the way, and as a result, the oil temperature may excessively rise even during continuous full load operation. Since it is avoided and the rise in intake air temperature is also prevented, the charging efficiency of the engine does not decrease. Further, the cooling water passage 39 and the subsequent passages are located downstream of the thermostat valve 38, and the engine E
There is no introduction of cooling water below a certain temperature immediately after startup, and during this period, the engine mount member 6 is not cooled by the water descending passage 45 and the cooling water passage 55, so that the warm-up operation of the engine E after cold starting is performed. Lubricating oil is not cooled, which causes trouble.

Excessive temperature rise of the engine mount member 6 due to the exhaust gas flowing through the exhaust passage 47 is avoided by the water rising passage 44, and returns from each lubricating portion of the engine E to the oil pan 21 via the engine mount member 6. The lubricating oil is also prevented from being heated by the engine mount member 6.

Moreover, the cooling water in the cooling water passage 55 is supplied from the plurality of holes 56 provided in the gasket 27 to the oil pan 21.
The oil pan 21 itself is cooled by the falling cooling water, and thereby the excessive temperature rise of the lubricating oil is prevented more effectively.

Exhaust gas from the engine E during low-speed operation passes through the exhaust passages 46, 47, 48 and an exhaust pipe 49.
From the exhaust gas into the extension case 5, and further into the exhaust introduction hole 61, the first exhaust silencer chamber 58, the guide hole 63, the second exhaust silencer chamber 59, the exhaust outlet hole 62, and the third exhaust silencer chamber 6.
After passing 0, the gas is discharged to the outside from the low speed operation exhaust port 50.
By passing through such an exhaust path, a large passage resistance can be secured while ensuring the passage area of the exhaust gas, and the exhaust noise at the time of low speed operation is combined with the throttling and expansion action when flowing through the guide hole 63. It can contribute to the reduction.

Further, the casing 1 and the engine mount member 6, and the engine mount member 6 and the oil pan 21 are joined on the same plane, so that the casing 1 and the oil pan 2 of the engine mount member 6 are joined together.
It is easy to process the connecting surface to 1. Moreover, casing 1
Since the common gasket 27 is interposed between the engine mount member 6 and the engine mount member 6 and between the engine mount member 6 and the oil pan 21, the number of gaskets 27 required is smaller than the conventional one in which individual gaskets are interposed. As a limit, the number of parts can be reduced. Further, the exhaust passage 47 of the engine mount member 6 is connected to the oil pan 21.
By providing the gasket 27 with an opening 52 for communicating with the exhaust passage 48 of the engine and an opening 51 for communicating the recess 43 of the oil pan 21 with the water rising passage 44 of the engine mount member 6, the gasket 27 is provided. It is not necessary to specially provide a gasket for sealing the connection portion, and the number of parts can be further reduced. Further, since the inner wall 5a on the casing 1 side and the partition wall 57 on the engine mount member 6 side are joined together with the gasket 27 interposed therebetween, the joint surface of the inner wall 5a and the partition wall 57 is not exposed to the exhaust gas, and is not exposed to the exhaust gas. Corrosion and solidification due to contact with

[0037]

As described above, according to the first aspect of the present invention, since the casing and the engine mount member, and the engine mount member and the oil pan are coupled in the same plane with the common gasket interposed, the engine is mounted. The mounting surface of the mount member to the casing and the oil pan can be easily processed, and the gasket required between the casing and the engine mount member and between the engine mount member and the oil pan is minimized to reduce the number of parts. It can be reduced.

According to the invention of claim 2, in addition to the structure of the invention of claim 1, an exhaust passage for guiding exhaust gas from the engine is provided in the engine mount member to an oil pan of the engine mount member. The oil pan is provided with an opening, and the oil pan is provided with an exhaust passage for guiding the exhaust gas from the exhaust passage into the casing. The exhaust passage is provided on the connecting surface of the oil pan to the engine mount member. Since the opening that connects the exhaust passages to each other is provided, it is not necessary to provide a special gasket for sealing the connection between the exhaust passage of the engine mount member and the exhaust passage of the oil pan, which reduces the number of parts. It can contribute further.

According to the third aspect of the present invention, the casing is provided with the inner wall located between the rear outer wall of the casing and the oil pan, the coupling surface of the casing and the engine mount member, and the engine mount member and the oil pan. A partition wall that is joined to the inner wall through the gasket in the same plane as the coupling surface of the exhaust muffler chamber that communicates with the inside of the engine mount member into the casing, and an exhaust muffler chamber that communicates with the exhaust port provided at the rear of the casing. Since the partition wall is provided in the engine mount member, and the partition wall is provided with a guide hole for communicating the exhaust silencing chambers on both sides of the partition wall,
Exhaust gas introduced into the casing can be raised upside down to the engine mount member side and discharged from the exhaust port through both exhaust muffling chambers, due to throttling and expansion when flowing through the guide hole between both exhaust muffling chambers. It is possible to obtain a sound deadening effect, and further, it is possible to prevent the joint surfaces of the inner wall and the partition wall from being exposed to the exhaust gas, and to prevent corrosion or solidification due to the exhaust gas from occurring on the joint surfaces.

Further, according to the invention of claim 4, in addition to the constitution of the invention of claim 1, 2 or 3, the oil pan is connected to a cooling pump arranged in a lower portion of the casing. A recessed portion that is opened on the coupling surface of the oil pan to the engine mount member, and a water rising passage that guides cooling water to the engine is opened on the engine mount member to the coupling surface of the engine mount member to the oil pan. Since the gasket is provided with an opening for communicating the recess and the water rising passage with each other, a gasket for sealing the connection between the recess of the oil pan and the water rising passage of the engine mount member is specially provided. It is not necessary to provide it, and it is possible to further contribute to the reduction of the number of parts.

[Brief description of drawings]

FIG. 1 is an overall side view of an outboard motor.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a partially enlarged vertical side view taken along line 3-3 of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is an enlarged sectional view taken along line 8-8 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 3 ... Driving force transmission means 4 ... Propeller 5a ... Inner wall 6 ... Engine mount member 21 ... Oil pan 27 ... Gasket 30 ... Cooling pump 43 ...・ Concave portion 44 ... Water rising passage 47, 48 ... Exhaust passage 50 ... Exhaust port 51, 52 ... Opening portion 57 ... Partition wall 58, 59 ... Exhaust silencer 63 ... Guide Hole E ... Engine

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F01M 11/00 P F01N 7/04 F01P 3/20 S F02B 67/00 R B63H 21/26 K

Claims (4)

[Claims] 1. A casing (1) containing a driving force transmitting means (3), and a propeller (4) connected to the driving force transmitting means (3) and supported at a lower end of the casing (1).
An engine (E) mounted on the engine mount member (6) connected to the engine mount member (6) coupled to the upper end of the casing (1) and the driving force transmission means (3).
And the engine mount member (6) inside the casing (1)
In an outboard motor including an oil pan (21) coupled to a lower end of the casing, the casing (1) and the engine mount member (6), and the engine mount member (6) and the oil pan (21) have a common gasket ( 27) The outboard motor is characterized in that it is coupled in the same plane with the interposition of 27). 2. An engine mount member (6) is provided with an exhaust passage (47) for guiding exhaust gas from the engine (E) to an opening on a coupling surface of the engine mount member (6) to an oil pan (21). In the oil pan (21), an exhaust passage (48) for guiding the exhaust gas from the exhaust passage (47) into the casing (1) is connected to the engine mount member (6) of the oil pan (21). It is provided by opening to
The outboard motor according to claim 1, wherein the gasket (27) is provided with an opening (52) for communicating the two exhaust passages (47, 48) with each other. 3. The casing (1) is provided with an inner wall (5a) located between a rear outer wall of the casing (1) and an oil pan (21), and the casing (1) and the engine mount member (6) are provided. A partition wall (57) joined to the inner wall (5a) through the gasket (27) in the same plane as the coupling surface and the coupling surfaces of the engine mount member (6) and the oil pan (21) includes an engine mount member ( 6) The engine mount member is divided into an exhaust muffler chamber (58) communicating with the inside of the casing (1) and an exhaust muffler chamber (59) communicating with an exhaust port (50) provided at the rear of the casing (1). (6), the partition (5
The outboard motor according to claim 2, characterized in that the guide hole (63) for communicating the exhaust silencing chambers (58, 59) on both sides of the guide hole (7) is provided in the (7). 4. The oil pan (21) is provided with a recess (43) connected to a cooling pump (30) arranged in a lower portion of the casing (1), and an engine mount member (of the oil pan (21)). The cooling water is provided on the engine mount member (6) by opening the coupling surface to the engine (E).
A water ascending passage (44) that is opened to the coupling surface of the engine mount member (6) to the oil pan (21), and the gasket (27) has the recess (43) and the ascending water passage (44). (51) for communicating the two) with each other
The outboard motor according to claim 1, 2 or 3, further comprising: