JPH10339165A - Outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve serviceability by partitioning a driving mechanism housing chamber between it and an engine by interposing a driving mechanism housing member between a vertically mounted engine and a mount support member, and housing a camshaft driving mechanism in this driving mechanism housing chamber. SOLUTION: The engine 2 of an outboard motor 1 is vertically mounted, and a chain case 5 is fixed under this engine 2, and an engine holder 6 is fixed under it. The chain case 5 and the engine holder 6 are designed so as to be liquidtightly overlapped on an oil pan 7, and the chain case 5 is formed in a tray shape having a partition surface 13. When the engine 2 and the chain case 5 are superposed on each other, a driving mechanism housing chamber 38 can be partitioned between an under surface of the engine 2 and the partition surface 13, and a camshaft driving mechanism 30 composed of a cam drive sprocket, a cam driven sprocket and a timing chain is housed in this driving mechanism housing chamber 38.

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 type engine mounted vertically.

[0002]

2. Description of the Related Art In many outboard motors, an engine is mounted vertically so that a crankshaft stands upright, and each piston of the engine slides in a horizontal direction. Also, a portion of the substantially flat mount support member provided below the engine is connected to a clamp bracket fixed to the hull side, thereby keeping the entire outboard motor steerable left and right with respect to the hull. .

[0003] In such an outboard motor, the engine is 4
In the case of the cycle type, the engine is generally mounted such that the camshaft drive mechanism for transmitting the rotation of the crankshaft to the camshaft via a chain or a belt is on the upper side (for example, see Japanese Patent Application Laid-Open No. 5-33779). Outboard motor described in Japanese Patent Publication No.

However, if the camshaft driving mechanism is arranged above the engine, not only the remaining space for disposing other parts above the engine is reduced, but also the protrusion of the crankshaft from the upper surface of the engine. There are a number of problems, such as an increase in the volume of the outboard motor causing vibration and an increase in the position of the heavy flywheel, thereby increasing the center of gravity of the outboard motor.

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

[0006]

However, since the camshaft drive mechanism is provided between the engine and the drive unit, the camshaft drive mechanism is exposed to the outside when the engine is detached from the drive unit by itself. As a result, there is a concern that adverse effects such as breakage and fouling of the camshaft drive mechanism may be caused. Also,
Maintenance work could not be performed by placing the removed engine on a flat workbench or the like, and maintenance was extremely poor.

The outboard motor according to the present invention has been invented in order to solve such a problem, and a first object of the invention is to provide an outboard motor which is mounted on the outboard motor when the engine is removed from the outboard motor. The camshaft drive mechanism provided on the side is not exposed to the outside to protect the camshaft drive mechanism, and at the same time, the detached engine can be mounted as a single unit on a flat work table or the like to improve maintainability. To improve it.

A second object of the outboard motor according to the present invention is to prevent the outboard motor from increasing in size when providing an exhaust passage and a cooling water passage connected to the engine.

Further, a third object of the outboard motor according to the present invention is to prevent the outboard motor from increasing in size when an oil pump is provided in the engine.

A fourth 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 fifth 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 driving mechanism.

Furthermore, a sixth object of the outboard motor according to the present invention is to prevent an oil level gauge for checking oil in an oil pan from interfering with a winding member of a camshaft drive mechanism, and The purpose of the present invention is to reduce the size and improve the layout.

[0013] A seventh object of the outboard motor according to the present invention is to arrange the thermostat of the cooling water with a good layout and to improve the waterproofness thereof.

An eighth object of the outboard motor according to the present invention is to arrange the electrical components for engine ignition with a good layout and to improve the waterproofness thereof.

[0015]

According to a first aspect of the present invention, there is provided an outboard motor according to the present invention, wherein a four-stroke type engine is provided with a camshaft drive mechanism mounted on a lower side. In an outboard motor configured to be mounted vertically and a mount support member provided below the engine is connected to a clamp bracket fixed to the hull side,
A drive mechanism housing member is interposed between the engine and the mount support member, a drive mechanism housing chamber is defined between the engine and the drive mechanism housing member, and a camshaft drive mechanism is provided inside the drive mechanism housing chamber. Housed.

In order to achieve the second object, the exhaust passage and the cooling water passage connected to the engine are formed integrally with the drive mechanism housing member.

Further, in order to achieve the third object,
As described in claim 3, an oil pump is provided integrally with the drive mechanism housing member.

Then, in order to achieve the fourth object,
As described in claim 4, a pump housing is integrally formed on the upper surface of the driving mechanism housing member, a pump cover for covering the pump housing is provided to constitute an oil pump, and the camshaft driving mechanism in plan view. A pressure valve was provided integrally with the pump cover, avoiding the winding member.

In order to achieve the fifth object, at least one of the lower surface of the engine is provided.
The two oil drop holes are arranged vertically above a timing chain used as a winding member of a camshaft drive mechanism.

Furthermore, in order to achieve the sixth object,
As described in claim 6, an oil level gauge which is inserted from the side of the drive mechanism housing member and reaches an oil pan provided below the mount support member is provided, and this oil level gauge is wound around the camshaft drive mechanism. It passed through the outer periphery rather than the mounting member.

Then, in order to achieve the seventh object,
The cooling water thermostat is provided on the upper surface of the engine.

Further, in order to achieve the eighth object, an electrical component for engine ignition is provided on the upper surface of the engine.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 longitudinal sectional view of the outboard motor 1 viewed from the same side. FIG. 3 is a right side view of the outboard motor 1 and FIG. 4 is a schematic left side view showing only 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 line VI-VI of FIG. 4, and FIG. 7 is a bottom view of the engine taken along line VII-VII of FIG.

The engine 2 of the outboard motor 1 is a four-stroke DOHC type in-line three-cylinder water-cooled gasoline engine having a crankshaft 3 and two camshafts 4L, 4R.
Is installed vertically so that it stands upright. Engine 2
A chain case 5 is fixed to a lower portion of the vehicle, and an engine holder 6 is fixed to a lower portion thereof. Then, an oil pan 7, a drive shaft housing 8 and a gear housing 9 are sequentially fixed to a lower portion of the engine holder 6. The engine 2 is entirely covered by a removable engine cover 11.

FIGS. 8 to 10 show the chain case 5 respectively.
FIG. 2 is a detailed view of a single unit of an engine holder 6 and an oil pan 7. 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 so as 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 gently inclined partition surface 13, and a narrow slit 14 extending in the vehicle width direction is formed in the center. The chain case 5 and the engine holder 6 are provided as a drive mechanism accommodating member and a mount support member, respectively.

The outboard motor 1 is provided with a clamp bracket 15 fixed to a hull (sternboard) (not shown).
Pilot shaft at the rear of this clamp bracket 15
16 are supported vertically and rotatably. Mount portions 17, 18 provided on the engine holder 6 and the drive shaft housing 8, respectively, are connected to the upper and lower ends of the pilot shaft 16 in a rotationally integrated manner. Therefore,
The outboard motor 1 is maintained to be steerable left and right with respect to the hull about a pilot shaft 16. Note that 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 parts such as a crankcase 21, a cylinder block 22, a cylinder head 23, a head cover 24 and the like are connected in order from the front. The crankshaft 3 is rotatably supported between a crankcase 21 and a cylinder block 22, and has camshafts 4L, 4R.
Is supported inside the cylinder head 23. Inside the cylinder block 22, three cylinders 25 are formed in a horizontal direction, and a piston 26 inserted therein is connected to the crankshaft 3 by a connecting rod 27. Also,
The camshafts 4L and 4R are inside the cylinder head 23.
Is accommodated.

On the lower side of the engine 2, a camshaft drive mechanism for transmitting the rotation of the crankshaft 3 to the two camshafts 4L and 4R to drive the valve gear 28.
30 are provided. This camshaft drive mechanism 30
For example, as shown in FIG. 7, a cam drive sprocket 31 provided integrally with the lower end of a crankshaft 3 protruding from the lower surface of the engine 2 is a chain drive system.
And a cam driven sprocket 32 rotatably provided at the lower ends of two camshafts 4L and 4R also protruding from the lower surface of the engine 2, and wound around the cam drive sprocket 31 and the cam driven sprocket 32. Timing chain 33 and a chain tensioner 34 for adjusting the tension of the timing chain 33
It is comprised including.

FIG. 11 is an enlarged view of the XI part in FIG.
A joint member 36 is 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 integrally connected to a lower end of the joint member 36 by a spline connection or the like.

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

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

An intake manifold 43 and a fuel injection device 44 are provided on the left side of the engine 2.
), The exhaust manifold 45 on the right side of the engine 2.
And an electrical component box 46 (see FIGS. 3 and 5 and 6), and a starter motor 47 for starting is installed on the front of the engine 2. The upper end of the crankshaft 3 protrudes from the upper surface of the engine 2, and a flywheel 49 is integrally provided at this portion, and a generator 50 for power generation is installed (see FIGS. 2 and 5). A starter motor 47, a flywheel 49, and a generator are provided by a cover member 51 formed of a synthetic resin or the like.
50 mag is covered from above.

Further, a thermostat 52 for cooling water and electric parts for igniting the engine, for example, a regulator 53 are provided 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 since the thermostat 52 and the regulator 53 are arranged at a high place, the waterproofness can be improved. The regulator 53
The present invention is not limited to this, and other electrical components may be installed on the upper surface of the engine 2.

As shown in FIG. 6, the relationship between the distance L1 from the center line C extending in the front-rear 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 located 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 rotational position of the camshaft are provided. As a result, the eccentric cam mechanism 56 and the discrimination sensor can be provided without greatly protruding from the engine 2, thereby contributing to the downsizing of the engine 2, and hence the outboard motor 1.

By the way, as shown in FIGS. 3 and 6,
Three exhaust ports 59 are open on the right side of the cylinder head 23. On the other hand, the exhaust manifold 45 includes 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 provided with exhaust passages 63, 64, 65 at their right edges, respectively.
The exhaust passages 63, 64, 65
Are aligned to form an exhaust passage 66 extending vertically (see FIG. 3). 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 flows from the exhaust manifold 45 to the exhaust passages 63, 64, 65 (exhaust passage 66).
After being discharged through the drive shaft housing 8 and expanded and silenced there, it is discharged into the water through an exhaust passage (not shown) formed inside the gear housing 9 and 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,
Reference numeral 69 denotes a cooling water supply passage which is formed in a substantially "U" shape so as to surround the exhaust passages 63, 64 and 65, and is aligned with each other and extends vertically.

The cooling water supply passage 67 of the chain case 5
The upper end thereof is closed leaving a circular small hole portion 70, and the small hole portion 70 has a cooling water supply hole 71 opened on the lower surface of the engine 2.
(See FIG. 7). The engine holder 6 and the oil pan 7 have a cooling water drain passage 73,
74 are provided integrally. These cooling water drain passages 73 and 74
Is a passage for flowing the cooling water discharged from the engine 2 downward and discharging it to the outside.

As shown in FIG. 2, a water pump 75 is provided 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. Further, a cooling water inlet 77 is provided on a 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 external water from the cooling water suction port 77, and the pumped water is supplied to the cooling water discharge pipe 76.
After flowing through the cooling water supply passages 69, 68, and 67 in this order, the cooling water flows 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 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 portions where the timing chain 33 is pushed away by the chain tensioner 34, so that the timing chain 33
Interference (approach) with the passages 63 to 69 can be prevented, which is very advantageous in terms of layout.

As shown in FIGS. 2 and 11 to 13, an oil pump 79 is provided integrally with the chain case 5. As shown in FIG.
A pump housing 80 is integrally formed on the upper surface of the pump housing 80, and a rotor room 81, a suction port 82, and a discharge port 83 are recessed here. And the inner rotor 84 and the outer rotor 85 are accommodated in the rotor room 81,
A trochoidal oil pump 79 is formed by covering the upper surface of the pump housing 80 with a pump cover 86 in a liquid-tight manner.

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

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 formed integrally (see FIG. 8).
The other end of the oil suction passage 89 extends near the center of the chain case 5 and has a small hole 91 opening at the tip. This 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 pan (see FIG. 2).
Hang near the bottom of the. On the other hand, the small holes 94 provided at the tip of the oil discharge passage 90 are aligned with the oil supply holes 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 a 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 which is a winding member of the camshaft drive mechanism 30 in 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 is provided for communicating the internal passage 98 to the outside (in the drive mechanism housing chamber 38).

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 to pump oil in the oil pan 7 from the oil strainer 93, and this oil is fed to the oil suction passage 89, the oil pump 79,
From the oil supply hole 95 through the oil discharge passage 90, the engine 2
Supplied internally. The engine 2 is provided with an oil filter 103 (see FIGS. 1, 5, and 7) so that the oil is filtered and then supplied to each lubrication unit.

The communication hole 101 of the pressure valve 97 is normally closed by a 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, and a part of the oil is discharged from the communication hole 101 to the outside of the oil pump 79 to prevent the pressure from rising.

The oil which has finished lubricating the inside of the engine 2 is
As shown in FIG. 7, the oil flows down from an oil drop hole 102 opened on the lower surface of the engine 2, flows on the inclined partition surface 13 of the chain case 5, and returns to the oil pan 7 from the slit 14.
The oil drop hole 102 is disposed vertically above the timing chain 33 of the camshaft drive mechanism 30. Therefore, the oil flowing down from the oil drop hole 102 falls on the timing chain 33, and the timing chain 33 is always well lubricated. When a plurality of oil pits are provided on the lower surface of the engine 2, at least one of the oil pits is attached to the timing chain.
It should just be arranged in the vertical upper part of 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 level and dirt of the liquid level OL of the oil stored in the oil pan 7, and is configured in a stick shape to be inserted from above into a gauge port 105 formed in the chain case 5. Have been.

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. Like this oil level gauge
By passing 104 through the outer periphery of the timing chain 33, the oil level gauge 104 is prevented from interfering with (approaching) the timing chain 33, contributing to the downsizing of the outboard motor 1 (engine 2) and improvement in layout. can do.

The height of the oil level OL is set to be sufficiently lower than the timing chain 33. This is because if the oil contacts the timing chain 33 that moves at high speed, the oil is violently stirred and foams, and the oil is sucked into the oil pump 79 to deteriorate the lubricity. Since the partition surface 13 of the chain case 5 is interposed between the oil level OL and the timing chain 33 and the partition surface 13 has no opening other than the narrow slit 14, the oil level Even if the OL swings violently, the oil itself does not easily touch the timing chain 33.

In the outboard motor 1 configured as described above, the camshaft drive mechanism 30 is housed inside the drive mechanism housing chamber 38 defined between the engine 2 and the chain case 5. When the engine 2 is removed from the outboard motor 1, the camshaft drive mechanism 30 is covered with the chain case 5 and is not exposed to the outside. Therefore, the camshaft drive mechanism
30 can be effectively protected from damage, fouling and the like.
Moreover, a chain case 5 is provided on the underside of the removed engine.
The engine can be mounted as a single unit on a flat workbench or the like, greatly improving maintainability.

The exhaust passages 63, 6 connected to the engine 2
4, 65, cooling water supply passage 67, 68, 69 and cooling water drain passage 7
3 and 74 are formed integrally with the chain case 5, the engine holder 6 and the oil pan 7, so that each of the passages 63, 64,
It is not necessary to pass 65, 67, 68, 69, 73, 74 to the outside of the outboard motor 1 using another pipe member or the like.
Can be effectively prevented from becoming larger. 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 enhanced.

Further, since the oil pump 79 is provided integrally with the chain case 5, the outboard motor 1 is prevented from being enlarged due to the installation of the oil pump 79. The oil pump 79 includes a pump housing 80 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 provided integrally so as to avoid the pressure valve 33, the pressure valve 97 can be installed compactly without interfering with the timing chain 33.

[0055]

As described above, the outboard motor according to the present invention has the drive mechanism accommodating member interposed between the engine and the mount supporting member, and has the drive mechanism interposed between the engine and the drive mechanism accommodating member. A housing chamber is defined, and a camshaft drive mechanism is housed inside the drive mechanism housing chamber. According to this configuration, when the engine is removed from the outboard motor, the camshaft drive mechanism provided on the lower side of the engine is not exposed to the outside, so that the camshaft drive mechanism can be protected and at the same time the removed engine can be removed. As a single unit, it can be placed on a flat work table or the like, so that maintainability can be improved.

Further, in the outboard motor according to the present invention, since the exhaust passage and the cooling water passage connected to the engine are formed integrally with the drive mechanism housing member, the size of the outboard motor is increased when providing the exhaust passage and the cooling water passage. Can be prevented.

Further, in the outboard motor according to the present invention, since the oil pump is provided integrally with the drive mechanism accommodating member, it is possible to prevent the outboard motor from increasing in size when providing the oil pump.

In the outboard motor according to the present invention, a pump housing is integrally formed on the upper surface of the drive mechanism housing member, and a pump cover for covering the pump housing is provided to constitute an oil pump. Since the pressure valve is provided integrally with the pump cover 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 disposed vertically above the timing chain used as a winding member of the camshaft drive mechanism, so that the lubrication conditions of the timing chain can be improved. Can be kept.

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

In the outboard motor according to the present invention, since the thermostat of the cooling water is provided on the upper surface of the engine, the waterproofness can be improved while the thermostat is arranged in a good layout.

Further, in the outboard motor according to the present invention, since the electrical components for engine ignition are provided on the upper surface of the engine, the waterproofness can be improved while the electrical components for engine ignition are arranged in a good layout.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of the outboard motor as viewed 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 basic components of the outboard motor, and is a view showing one embodiment of the present invention.

FIG. 5 is a top view of the engine.

FIG. 6 is a cross-sectional view of the engine taken along the line VI-VI in FIG. 4;

FIG. 7 is a bottom view of the engine as viewed in the direction of arrows VII-VII in FIG. 4;

8A is a top view of the chain case, FIG. 8B is a bottom view of the chain case, and FIG. 8C is a longitudinal 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 longitudinal 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 longitudinal sectional view of the oil pan along line XC-XC in FIG. 10A.

FIG. 11 is an enlarged view of a part XI in FIG. 2;

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.

FIG. 13 is a vertical cross-sectional view of the chain case taken along line XIII-XIII in FIG. 12;

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

FIG. 15 is a longitudinal sectional view of the chain case taken along line XV-XV in FIG. 12;

[Explanation of symbols]

Reference Signs List 1 outboard motor 2 engine 3 crankshaft 4L, 4R camshaft 5 chain case as drive mechanism housing member 6 engine holder as mount support member 7 oil pan 8 drive shaft housing 9 gear housing 13 partition 15 clamp bracket 30 camshaft Drive mechanism 33 Timing chain, which is the winding member of the camshaft drive mechanism 38 Drive mechanism accommodating chamber 52 Thermostat 53 Regulator, which is the electrical component for engine ignition 63, 64, 65 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

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code FI F01M 11/12 F02B 67/00 F F02B 67/00 G F02P 15/00 301J B63H 21/26 D F02P 15/00 301F (72 ) Inventor, Katsuhiro Fukuda 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor Jun Ito 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. Address Suzuki Co., Ltd. (72) Inventor Shuichi Hagino 300 Suzuki Co., Ltd.

Claims (8)

[Claims] 1. A four-cycle engine is mounted vertically with a camshaft drive mechanism facing downward, and a mount support member provided below the engine is connected to a clamp bracket fixed to the hull. In the outboard motor having the above configuration, a drive mechanism housing member (5) is interposed between the engine 2 and the mount support member (6), and a drive mechanism housing chamber is provided between the engine 2 and the drive mechanism housing member (5). An outboard motor characterized in that a camshaft drive mechanism 30 is housed inside the drive mechanism housing chamber 38. 2. The outboard motor according to claim 1, wherein the exhaust passage 63 and the cooling water passage (67) connected to the engine 2 are formed integrally with the drive mechanism housing member (5). 3. An oil pump 79 is provided in the drive mechanism housing member (5).
The outboard motor according to claim 1, wherein the outboard motor is integrally provided. 4. An oil pump 79 is formed by integrally forming a pump housing 80 on an upper surface of the drive mechanism housing member (5), and a pump cover 86 covering the pump housing 80 is provided. 4. The outboard motor according to claim 3, wherein a pressure valve 97 is provided integrally with the pump cover 86 while avoiding the winding member (33) of the shaft drive mechanism 30. 5. The outboard motor according to claim 1, wherein at least one oil drop hole on a lower surface of the engine is disposed vertically above a timing chain used as a winding member of the camshaft drive mechanism. 6. An oil level gauge 104 which is inserted from the side of the drive mechanism housing member (5) and reaches the inside of an oil pan 7 provided below the mount support member (6) is provided. The outboard motor according to claim 1, wherein the outboard motor passes through the outer periphery of the winding member (33) of the shaft drive mechanism 30. 7. The cooling water thermostat 52 is connected to the engine 2
The outboard motor according to claim 1, which is provided on an upper surface of the outboard motor. 8. The outboard motor according to claim 1, wherein an electrical component for engine ignition is provided on an upper surface of the engine.