JP3511848B2 - Outboard motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor having a four-cycle engine mounted vertically.

[0002]

2. Description of the Related Art In many outboard motors, the engine is mounted vertically so that the crankshaft stands upright, and the pistons of the engine slide horizontally. Further, a portion of a substantially flat plate-shaped mount support member provided below the engine is connected to a clamp bracket fixed to the hull side, whereby the entire outboard motor is kept steerable left and right with respect to the hull. .

In such an outboard motor, the engine has four
In the case of the cycle type, the engine is generally mounted so that the camshaft drive mechanism that transmits the rotation of the crankshaft to the camshaft via the chain or belt is on the upper side (for example, Japanese Patent Laid-Open No. 5-33779). (Outboard motor described in Japanese Patent Publication).

However, when the camshaft drive mechanism is arranged on the upper side of the engine as described above, not only the remaining space for arranging other parts on the upper part of the engine is reduced, but also the crankshaft protrudes from the upper surface of the engine. There are various problems that the amount becomes long and causes vibration, and the position of a heavy flywheel increases and the center of gravity of the outboard motor increases.

Therefore, an outboard motor equipped with an engine so that the camshaft drive mechanism is on the lower side has been developed (for example, JP-A-60-113030 and JP-A-60-1130).
(Outboard motor described in Japanese Patent No. 31). In such an outboard motor, the camshaft drive mechanism is located between the engine and the drive unit (driveshaft housing) below the engine.

[0006]

However, since the camshaft drive mechanism is provided between the engine and the drive unit as described above, when the engine alone is removed from the drive unit, the camshaft drive mechanism is exposed to the outside. Therefore, there is a concern that the camshaft drive mechanism may be damaged or damaged. Also,
The removed engine could not be placed on a flat workbench for maintenance work, and maintainability was very poor.

The outboard motor according to the present invention was invented in order to solve such a problem. A first object of the outboard motor is to remove the engine from the outboard motor when the engine is removed from the outboard motor. Protects the camshaft drive mechanism by preventing the camshaft drive mechanism provided on the side from being exposed to the outside, and at the same time makes it possible to place the removed engine as a unit on a flat workbench etc. for maintainability. To improve.

A second object of the outboard motor according to the present invention is to prevent the outboard motor from increasing in size when the exhaust passage and the cooling water passage leading to the engine are provided.

[0009]

A third object of the outboard motor according to the present invention is to make it possible to install the pressure valve of the oil pump compactly without interfering with the camshaft drive mechanism.

A fourth object of the outboard motor according to the present invention is to maintain good lubrication conditions for a timing chain used as a winding member of a camshaft drive mechanism.

A fifth object of the outboard motor according to the present invention is to prevent the oil level gauge for checking the oil in the oil pan from interfering with the winding member of the camshaft drive mechanism, and to improve the outboard motor. The goal is to make the system compact and improve layout.

A sixth object of the outboard motor according to the present invention is to arrange a thermostat of cooling water in a good layout and to improve its waterproof property.

A seventh object of the outboard motor according to the present invention is to arrange the electrical components for engine ignition in a good layout and to improve the waterproof property.

[0015]

In order to achieve the first object, an outboard motor according to the present invention has an exhaust gas on a side surface of a cylinder of a four-cycle engine as described in claim 1.
A manifold is provided, the engine is mounted vertically with the camshaft drive mechanism facing downward, and a mount support member provided below the engine is connected to a clamp bracket fixed to the hull side. In the external machine, the camshaft drive mechanism is a chain drive system.
Between the crankcase and the cylinder block.
The cam drive installed at the lower end of the crankshaft
It is pivotally supported inside the bus sprocket and cylinder head.
Cam drive mechanism installed at the lower end of the camshaft
And these cam drive sprockets and cams
Timing belt wrapped around the driven sprocket
And adjust the tension of this timing chain
While including a chain tensioner to
Ejection of substantially flat between the mounting support member and the engine
Drive mechanism housing member is inserted and fixed to drive the lower surface of the engine
A drive mechanism accommodating chamber is defined between the partition surface of the mechanism accommodating member and the camshaft drive mechanism is accommodated inside the drive mechanism accommodating chamber.

In order to achieve the second object, as described in claim 2, the exhaust passage and the cooling water passage connected to the engine are connected to the chain tensioner of the drive mechanism accommodating member.
Formed integrally on the side .

[0017]

In order to achieve the third object,
As described in claim 3, a pump housing is integrally formed on the upper surface of the drive mechanism accommodating member, and a pump cover that covers the pump housing is provided to configure an oil pump, and the camshaft drive mechanism in plan view. A pressure valve was provided integrally with the pump cover, avoiding the winding member.

Further , in order to achieve the fourth object,
As described in claim 4, at least one of the lower surface of the engine
One oil drop hole is placed vertically above the timing chain used as the winding member of the camshaft drive mechanism.

Further, in order to achieve the fifth object,
As described in claim 5, an oil level gauge which is inserted from the side surface of the drive mechanism housing member and reaches the inside of the oil pan provided below the mount support member is provided, and this oil level gauge is wound by the camshaft drive mechanism. It passed through the outer circumference rather than the mounting member.

In order to achieve the sixth object,
As described in claim 6 , the cooling water thermostat is provided on the upper surface of the cylinder head of the engine.

Moreover, in order to achieve the seventh object,
As described in Requirement 7, the electric component for engine ignition is directly provided on the upper surface of the engine.

[0023]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of an outboard motor 1 according to the present invention, and FIG. 2 is a vertical cross-sectional view of the outboard motor 1 seen from the same side. 3 is a right side view of the outboard motor 1, and FIG. 4 is a schematic left side view showing only the basic components of the outboard motor 1. 5 is a top view of the engine, FIG. 6 is a cross-sectional view of the engine taken along the line VI-VI of FIG. 4, and FIG. 7 is a bottom view of the engine taken along the line VII-VII of FIG.

The engine 2 of the outboard motor 1 is a 4-cycle DOHC type in-line 3-cylinder water-cooled gasoline engine, which has a crankshaft 3 and two camshafts 4L, 4R.
Are mounted vertically so that they stand upright. Engine 2
The chain case 5 is fixed to the lower part of the engine and the engine holder 6 is fixed to the lower part. Then, the oil pan 7, the drive shaft housing 8, and the gear housing 9 are fixed to the lower portion of the engine holder 6 in order. The engine 2 is entirely covered with a removable engine cover 11.

8 to 10 show the chain case 5 respectively.
FIG. 3 is a detailed view of the engine holder 6 and the oil pan 7 as a single item. The oil pan 7 is formed in a deep bottomed container shape, and the chain case 5 and the engine holder 6 are formed in a substantially flat plate shape and are designed to be liquid-tightly stacked on the oil pan 7. A substantially square hole 12 communicating with the inside of the oil pan 7 is formed in the center of the engine holder 6. Further, the chain case 5 is formed in a tray shape having a partition surface 13 which is gently inclined, and a thin slit 14 extending in the vehicle width direction is formed in the center portion. The chain case 5 and the engine holder 6 are provided as a drive mechanism housing member and a mount support member described in claim 1, respectively.

The outboard motor 1 is provided with a clamp bracket 15 fixed to the hull (stern plate) side (not shown),
Pilot shaft on the rear of this clamp bracket 15
16 is vertically and rotatably supported. Mount parts 17 and 18 respectively provided on the engine holder 6 and the drive shaft housing 8 are rotatably connected to the upper and lower ends of the pilot shaft 16. Therefore,
The outboard motor 1 is held so that it can be steered left and right with respect to the hull about a pilot shaft 16. A steering arm 19 for steering the outboard motor 1 is provided so as to rotate integrally with the pilot shaft 16.

The engine 2 is assembled so that the crankcase 21, the cylinder block 22, the cylinder head 23, the head cover 24 and the like are connected in this order from the front. The crankshaft 3 is axially supported between the crankcase 21 and the cylinder block 22, and the camshafts 4L and 4R are provided.
Is rotatably supported inside the cylinder head 23. Inside the cylinder block 22, three cylinders 25 are horizontally formed, and a piston 26 inserted therein is connected to the crankshaft 3 by a connecting rod 27. Also,
Inside the cylinder head 23, camshafts 4L, 4R
The valve operating device 28 driven by the is accommodated.

On the lower side of the engine 2, a camshaft drive mechanism for driving the valve operating device 28 by transmitting the rotation of the crankshaft 3 to the two camshafts 4L, 4R.
30 are provided. This camshaft drive mechanism 30
For example, a chain drive system is used, and as shown in FIG. 7, a cam drive sprocket 31 is provided integrally with the lower end of the crankshaft 3 protruding from the lower surface of the engine 2 so as to rotate integrally therewith.
And cam driven sprocket 32, which is provided integrally with the lower ends of the two cam shafts 4L and 4R projecting from the lower surface of the engine 2 so as to rotate together, and is wound around these cam drive sprocket 31 and cam driven sprocket 32. Timing chain 33 and a chain tensioner 34 for adjusting the tension of the timing chain 33.
It is configured to include and.

As shown in FIG. 11 by enlarging the XI section of FIG.
A joint member 36 is rotationally and integrally fixed to the lower end of the crankshaft 3 by press fitting or the like, and a cam drive sprocket 31 is integrally formed at the upper end of the joint member 36. A drive shaft 37 extending downward is rotatably connected to the lower end of the joint member 36 by spline connection or the like.

As shown in FIGS. 2, 4, and 11, when the engine 2 and the chain case 5 are overlapped with each other, a drive mechanism accommodating chamber 38 is formed between the lower surface of the engine 2 and the partition surface 13 of the chain case 5. The camshaft driving mechanism 30 is defined and is housed in the driving mechanism housing chamber 38.

On the other hand, the drive shaft 37 extends downward from the joint member 36 and extends to the chain case 5, the engine holder 6, the oil pan 7, and the drive shaft housing 8.
Of the gear housing 9 and the lower end thereof reaches the inside of the gear housing 9. As shown in FIG. 4, a propeller shaft 39 extending in the front-rear direction is axially supported inside the gear housing 9, and a propeller 40 is rotatably provided at the rear end of the propeller shaft 39. Then, the rotation of the drive shaft 37, that is, the crankshaft 3 is transmitted to the propeller shaft 39 by the bevel gear mechanism 41 provided at the intersection of the drive shaft 37 and the propeller shaft 39, and the propeller 40 is rotationally driven to obtain thrust. Has become.

An intake manifold 43 and a fuel injection device 44 are installed on the left side surface of the engine 2 (see FIGS. 1 and 5 and 6).
Exhaust manifold 45 on the right side of the engine 2)
An electric component box 46 is installed (see FIGS. 3 and 5 and 6), and a starter motor 47 for starting is installed on the front surface of the engine 2. Further, the upper end of the crankshaft 3 projects to the upper surface of the engine 2, and a flywheel 49 is provided integrally therewith and a generator 50 for power generation is installed in this portion (see FIGS. 2 and 5). Then, the starter motor 47, the flywheel 49, and the generator are covered by the cover member 51 formed of synthetic resin or the like.
50 mag is covered from above.

Further, a cooling water thermostat 52 and an electric component for igniting the engine, such as a regulator 53, are installed on the upper surface of the engine 2 (see FIG. 5). By doing so, the thermostat 52 and the regulator 53 can be arranged in a good layout, and moreover, since the thermostat 52 and the regulator 53 are arranged at a high place, waterproofness can be improved. In addition, regulator 53
However, other electrical components may be installed on the upper surface of the engine 2.

Further, as shown in FIG. 6, the relationship between the distance L1 from the center line C extending in the longitudinal direction of the engine 2 to the left camshaft 4L and the distance L2 from the center line C to the right camshaft 4R. Is L1 <L2, but the fuel pump 55 is provided on the camshaft 4L side near the center line C.
An eccentric cam mechanism 56 for driving and a discrimination sensor (not shown) for detecting a camshaft rotational position are provided. As a result, the eccentric cam mechanism 56 and the discrimination sensor can be provided without significantly protruding from the engine 2, and it is possible to contribute to downsizing of the engine 2, and thus the outboard motor 1.

By the way, as shown in FIG. 3 and FIG.
Three exhaust ports 59 are opened on the right side surface of the cylinder head 23. On the other hand, the exhaust manifold 45 is provided with one manifold pipe 60 extending in the vertical direction and three manifold branches 61 branched from the manifold pipe 60, and each manifold branch 61 is connected to each exhaust port 59. .

On the other hand, the chain case 5, the engine holder 6 and the oil pan 7 are formed with exhaust passages 63, 64 and 65 at their right edges, respectively, and three members 5, 6, 7 are provided.
The exhaust passages 63, 64, 65 by overlapping
Are aligned, and an exhaust passage 66 (see FIG. 3) extending in the vertical direction is formed. Then, the lower end of the manifold pipe 60 of the exhaust manifold 45 is inserted into the exhaust passage 63 of the chain case 5 from above.

Therefore, the exhaust gas of the engine 2 is exhausted from the exhaust manifold 45 to the exhaust passages 63, 64, 65 (exhaust passage 66).
It is discharged to the inside of the drive shaft housing 8 through the passage, expanded and silenced there, and then discharged into the water through the inside of the gear housing 9 and an exhaust passage (not shown) formed at the center of the propeller 40.

The chain case 5, the engine holder 6 and the oil pan 7 are integrally provided with cooling water supply passages 67, 68 and 69. These cooling water supply passages 67, 68,
69 is formed in a substantially U-shape so as to surround the exhaust passages 63, 64, 65, and constitutes a cooling water supply passage which is aligned with each other and extends in the vertical direction.

The cooling water supply passage 67 of the chain case 5 is
The upper end is closed except for a circular small hole portion 70, and this small hole portion 70 is opened to the lower surface of the engine 2 and is a cooling water supply hole 71.
(See FIG. 7). In addition, the engine holder 6 and the oil pan 7 have a cooling water drain passage 73,
74 is provided integrally. This cooling water drainage passage 73,74
Is a passage for causing the cooling water discharged from the engine 2 to flow downward and be discharged to the outside.

As shown in FIG. 2, a water pump 75 is installed above the gear housing 9, and a cooling water discharge pipe 76 extending upward from the water pump 75 is connected to a cooling water supply passage 69 of the oil pan 7. A cooling water suction port 77 is provided on the side surface of the gear housing 9. When the engine 2 starts and the drive shaft 37 rotates, the water pump 75 is driven to pump the external water from the cooling water suction port 77, and the pumped water is the cooling water discharge pipe 76.
Through the cooling water supply passages 69, 68, 67 in order to flow into the cooling water supply hole 71 of the engine 2 to cool the inside of the engine 2.

The chain tensioner 34 of the camshaft drive mechanism 30 is provided on the side of the exhaust passages 63, 64, 65 and the cooling water supply passages 67, 68, 69. As a result, the exhaust passages 63, 64, 65 and the cooling water supply passages 67, 68, 69 are provided in the portion where the timing chain 33 is pushed away by the chain tensioner 34.
It is possible to prevent interference (approach) with each passage 63 to 69, which is very advantageous in terms of layout.

By the way, as shown in FIGS. 2 and 11 to 13, the chain case 5 is integrally provided with an oil pump 79. As shown in FIG. 8, the chain case 5
A pump housing 80 is integrally formed on the upper surface of the, and a rotor room 81, a suction port 82, and a discharge port 83 are recessed therein. Then, the inner rotor 84 and the outer rotor 85 are housed in the rotor room 81,
A trochoidal oil pump 79 is configured by liquid-tightly covering the upper surface of the pump housing 80 with a pump cover 86.

In the center hole 87 of the inner rotor 84, the joint member 36 fixed to the lower end of the crankshaft 3 so as to rotate integrally is inserted as described above. The shape of the center hole 87 of the inner rotor 84 is formed so that the joint member 36 can be fitted therein, and the inner rotor 84 and the joint member 36 are integrally rotated.

Further, the chain case 5 has a suction port.
An oil suction passage 89 connected to 82 and an oil discharge passage 90 connected to the discharge port 83 are integrally formed (see FIG. 8).
The other end of the oil suction passage 89 extends near the center of the chain case 5, and its tip is a small hole portion 91 that opens downward. The small hole portion 91 is aligned with an oil passage 92 formed near the center of the engine holder 6. Oil passage 92
An oil strainer 93 is connected to the lower end of the oil strainer 93 (see FIG. 2).
Droop to near the bottom of. On the other hand, the small hole portion 94 provided at the tip of the oil discharge passage 90 is adapted to be aligned with the oil supply hole 95 (see FIG. 7) opened on the lower surface of the engine 2.

As shown in FIGS. 12 to 14, the oil pump 79
The pump cover 86 is integrally provided with a pressure valve 97 for preventing pressure rise. The pressure valve 97 is formed in a tubular shape extending horizontally from the upper portion of the discharge port 83 so as to avoid the timing chain 33 that is a winding member of the camshaft drive mechanism 30 in a plan view (see FIG. 11). A slide valve 99 and a coil spring 100 are built in the internal passage 98, and a communication hole 101 for connecting the internal passage 98 to the outside (inside the drive mechanism housing chamber 38) is provided.

The oil pan 7 is filled with oil, and the oil level OL (see FIG. 2) is within the range of the thickness of the engine holder 6. When the engine 2 starts and the crankshaft 3 rotates, the oil pump 79 is driven and the oil in the oil pan 7 is pumped up from the oil strainer 93, and this oil is supplied to the oil suction passage 89, the oil pump 79,
Engine 2 from oil supply hole 95 through oil discharge passage 90
Supplied internally. The engine 2 is provided with an oil filter 103 (see FIGS. 1, 5 and 7) so that the oil is filtered before being supplied to each lubricating portion.

The communication hole 101 of the pressure valve 97 is normally closed by the slide valve 99, and slides against the urging force of the coil spring 100 by high pressure only when the pressure at the discharge port 83 exceeds a predetermined value. The valve 99 is pushed open, part of the oil is discharged from the communication hole 101 to the outside of the oil pump 79, and the pressure rise is prevented.

The oil that has lubricated the inside of the engine 2 is
As shown in FIG. 7, the oil flows down from an oil drop hole 102 that is opened in the lower surface of the engine 2, flows through the inclined partition surface 13 of the chain case 5, and returns from the slit 14 to the oil pan 7.
The oil drain hole 102 is arranged vertically above the timing chain 33 of the camshaft drive mechanism 30. Therefore, the oil that flows down from the oil drop hole 102 falls on the timing chain 33, and the timing chain 33 is always lubricated well. If the lower surface of the engine 2 is provided with a plurality of oil drop holes, at least one of the oil drop holes should be provided in the timing chain.
It should be placed vertically above 33.

As shown in FIGS. 1 and 15, an oil level gauge 104 is provided on the left side surface of the chain case 5. The oil level gauge 104 is for inspecting the height and dirt of the liquid level OL of the oil stored in the oil pan 7, and is configured as a stick that is inserted into the gauge port 105 formed in the chain case 5 from above. Has been done.

The gauge port 105 is formed obliquely toward the inside of the oil pan 7, and its inclination angle is set so that the oil level gauge 104 passes through the outer periphery of the timing chain 33. Oil level gauge like this
By passing 104 on the outer peripheral side of the timing chain 33, it is possible to prevent the oil level gauge 104 from interfering (approaching) with the timing chain 33, which contributes to downsizing of the outboard motor 1 (engine 2) and improvement of layout. can do.

The height of the oil level OL is set to be sufficiently lower than that of the timing chain 33. This is because when the oil contacts the timing chain 33 that moves at high speed, the oil is vigorously stirred and bubbles, and the bubbles are sucked into the oil pump 79 to impair the lubricity. Since the partition surface 13 of the chain case 5 is interposed between the oil liquid surface OL and the timing chain 33, and the partition surface 13 has no openings other than the thin slits 14, the oil liquid surface is not formed. Even if the OL shakes violently, the oil itself is hard to touch the timing chain 33.

In the outboard motor 1 configured as described above, the camshaft drive mechanism 30 is housed in the drive mechanism housing chamber 38 defined between the engine 2 and the chain case 5. When removing the engine 2 from the outboard motor 1, the camshaft drive mechanism 30 is covered by the chain case 5 and is not exposed to the outside. Therefore, the camshaft drive mechanism
It is possible to effectively protect the 30 from damage and stains.
Moreover, the chain case 5 is attached to the bottom of the removed engine.
Since the engine is attached, the engine can be mounted on a flat work table or the like as one unit, and the maintainability is greatly improved.

Further, exhaust passages 63, 6 connected to the engine 2
4, 65 and cooling water supply passage 67, 68, 69 and cooling water drain passage 7
Since 3, 74 are formed integrally with the chain case 5, the engine holder 6, and the oil pan 7, the passages 63, 64,
It is not necessary to pass the 65, 67, 68, 69, 73, and 74 to the outside of the outboard motor 1 by using another pipe member or the like, and thus the outboard motor 1
Can be effectively prevented from increasing in size. Since the exhaust passages 63, 64, 65 and the cooling water supply passages 67, 68, 69 are provided adjacent to each other, the heat of the exhaust gas flowing in the exhaust passages 63, 64, 65 is stored in the oil pan 7. The heated oil is prevented from being heated, and the lubrication performance is improved.

Further, since the oil pump 79 is provided integrally with the chain case 5, it is possible to prevent the outboard motor 1 from becoming large due to the installation of the oil pump 79. The oil pump 79 includes a pump housing 80 that is integrally formed on the upper surface of the partition surface 13 of the chain case 5, and a pump cover 86 that covers the pump housing 80. Is a timing chain in plan view
Since the pressure valve 97 is integrally provided to avoid the 33, the pressure valve 97 can be installed compactly without interfering with the timing chain 33.

[0055]

As described above, in the outboard motor according to the present invention, the camshaft drive mechanism is the chain drive system.
The shaft between the crankcase and the cylinder block.
Cam drive installed at the lower end of the crankshaft
It is rotatably supported inside the sprocket and cylinder head.
A cam driven sprocket provided on the lower end of the cam shaft.
And these cam drive sprockets and cams
Timing chain wrapped around the rib sprocket
And adjust the tension of this timing chain.
Chain tensioner and
Drive in a substantially flat plate shape between the engine and the mount support member
The mechanism housing member is inserted and fixed, and the lower surface of the engine and the drive machine
A drive mechanism housing chamber is defined between the partition surface of the structure housing member and
The camshaft drive mechanism is housed inside the drive mechanism housing chamber. With this configuration, when the engine is removed from the outboard motor, the camshaft drive mechanism provided below the engine is not exposed to the outside, so the camshaft drive mechanism can be protected and the removed engine can be removed at the same time. The unit can be placed on a flat workbench or the like as one unit, and maintainability can be improved.

Further, in the outboard motor according to the present invention, the exhaust passage and the cooling water passage connected to the engine are connected to the drive mechanism housing member .
Since it is integrally formed on the vane tensioner side, it is possible to prevent the outboard motor from increasing in size when the exhaust passage and the cooling water passage are provided.

[0057]

Further, in the outboard motor according to the present invention, the pump housing is integrally formed on the upper surface of the drive mechanism accommodating member, and the pump cover for covering the pump housing is provided to configure the oil pump, and also in a plan view. Since the pressure valve is integrally provided on the pump cover while avoiding the winding member of the camshaft drive mechanism, the pressure valve of the oil pump can be installed compactly without interfering with the camshaft drive mechanism.

Further, in the outboard motor according to the present invention, at least one oil drop hole on the lower surface of the engine is arranged vertically above the timing chain used as the winding member of the camshaft drive mechanism, so that the lubricating condition of the timing chain is good. Can be kept at

Further, the outboard motor according to the present invention is provided with an oil level gauge which is inserted from the side surface of the drive mechanism accommodating member and reaches the inside of the oil pan provided below the mount supporting member, and this oil level gauge is cammed. The oil level gauge is prevented from interfering with the winding member of the camshaft drive mechanism because it is passed through the outer periphery of the winding member of the shaft drive mechanism, and the outboard motor can be made compact and the layout can be improved. .

Since the outboard motor according to the present invention is provided with the cooling water thermostat on the upper surface of the cylinder head of the engine, it is possible to improve waterproofness while arranging the thermostat in a good layout.

Further, in the outboard motor according to the present invention, since the electric component for engine ignition is directly provided on the upper surface of the engine, it is possible to improve the waterproof property while arranging the electric component for engine ignition in a good layout.

[Brief description of drawings]

FIG. 1 is a left side view of an outboard motor.

FIG. 2 is a vertical cross-sectional view of the outboard motor seen from the left side.

FIG. 3 is a right side view of the outboard motor.

FIG. 4 is a schematic left side view showing only the basic components of the outboard motor, showing an embodiment of the present invention.

FIG. 5 is a top view of the engine.

6 is a cross-sectional view of the engine taken along the line VI-VI of FIG.

FIG. 7 is a bottom view of the engine taken along the line VII-VII in FIG.

8A is a top view of the chain case, FIG. 8B is a bottom view of the chain case, and FIG. 8C is a vertical cross-sectional view of the chain case taken along line VIIIC-VIIIC of FIG.

9A is a top view of the engine holder, FIG. 9B is a bottom view of the engine holder, and FIG. 9C is a vertical cross-sectional view of the engine holder taken along line IXC-IXC of FIG. 9A.

10A is a top view of the oil pan, FIG. 10B is a bottom view of the oil pan, and FIG. 10C is a vertical cross-sectional view of the oil pan taken along line XC-XC of FIG.

FIG. 11 is an enlarged view of a XI portion in FIG.

FIG. 12 is a top view of the chain case showing a state where the pump cover is attached to the pump housing and the oil pump is assembled.

13 is a vertical cross-sectional view of the chain case taken along the line XIII-XIII in FIG.

14 is a vertical sectional view of the pressure valve taken along line XIV-XIV in FIG.

15 is a vertical cross-sectional view of the chain case taken along line XV-XV in FIG.

[Explanation of symbols]

1 Outboard Motor 2 Engine 3 Crankshaft 4L, 4R Camshaft 5 Chain Case 6 as Drive Mechanism Housing Member 6 Engine Holder as Mount Support Member 7 Oil Pan 8 Driveshaft Housing 9 Gear Housing 13 Partition Surface 15 Clamp Bracket 30 Camshaft Drive mechanism 33 Timing chain 38 which is a winding member of the camshaft drive mechanism 38 Drive mechanism accommodating chamber 52 Thermostat 53 Regulator 63, 64, 65 which is an electrical component for engine ignition Exhaust passage 67, 68, 69 Cooling water passage connected to the engine Cooling water supply passage 73, 74 Cooling water drain passage 75 Water pump 79 Oil pump 80 Pump housing 86 Pump cover 93 Oil strainer 97 Pressure valve 102 Oil drop hole 104 Oil level gauge

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI F02B 67/00 F02B 67/00 GR (72) Inventor Katsuhiro Fukuda 300, Takatsuka-cho, Hamamatsu City, Shizuoka Prefecture Suzuki Stock Company (72 ) Inventor Jun Ito 300 Takatsuka-cho, Hamamatsu City, Shizuoka Prefecture, Suzuki Suzuki stock company (72) Inventor Akira Takahashi 300, Takatsuka-cho, Hamamatsu City, Shizuoka Prefecture Suzuki stock company (72) Inventor Shuichi Hagino, Takatsuka, Hamamatsu City, Shizuoka Prefecture 300, Machi, Suzuki Suzuki Co., Ltd. (56) Reference JP-A-9-119305 (JP, A) JP-A-5-312051 (JP, A) JP-A-5-321692 (JP, A) JP-A-10 −2229 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02B 67/00 F02B 67/06 F01M 1/02 F01M 1/06 F01M 11/12 B63H 20/00 B63H 20 / 28

Claims (7)

(57) [Claims] 1. A cylinder of a four-cycle engine .
An exhaust manifold is provided on the side, and this engine is mounted vertically with the camshaft drive mechanism facing down.
In an outboard motor in which a mount support member provided below the engine is connected to a clamp bracket fixed to the hull side, the camshaft drive mechanism has a chain drive mechanism.
Dynamic system, crankcase and cylinder block
Provided at the lower end of the crankshaft that is pivotally supported between
Inside the cam drive sprocket and cylinder head
The cam drive provided at the lower end of the cam shaft that is supported by
Bun sprocket and these cam drive sprockets
And the tare wrapped around the cambed sprocket.
Immediate chain and this timing chain
Consists of a chain tensioner to adjust the
The other hand, substantially between the mounting support member and the engine
A flat drive mechanism accommodating member is inserted and fixed to
An outboard motor, characterized in that a drive mechanism accommodating chamber is defined between a lower surface and a partition surface of the drive mechanism accommodating member, and the camshaft drive mechanism is accommodated inside the drive mechanism accommodating chamber. 2. The outboard motor according to claim 1, wherein the exhaust passage and the cooling water passage connected to the engine are integrally formed on the chain tensioner side of the drive mechanism housing member . 3. A pump housing is integrally formed on the upper surface of the drive mechanism accommodating member, a pump cover for covering the pump housing is provided to form an oil pump, and the winding member of the camshaft drive mechanism is seen in a plan view. the avoid claims provided with a pressure valve integrally with the pump cover
The outboard motor according to item 1 . 4. The outboard motor according to claim 1, wherein at least one oil drop hole on the lower surface of the engine is arranged vertically above a timing chain used as a winding member of a camshaft drive mechanism. 5. An oil level gauge which is inserted from a side surface of the drive mechanism accommodating member and reaches the inside of an oil pan provided below the mount support member is provided, and the oil level gauge is provided more than the winding member of the camshaft drive mechanism. The outboard motor according to claim 1, which is passed through the outer periphery. 6. A of the cooling water of the thermostat engine
The outboard motor according to claim 1, wherein the outboard motor is provided on an upper surface of the linder head . 7. The outboard motor according to claim 1, wherein an electric component for engine ignition is directly provided on an upper surface of the engine.