JP2003201818A - Outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To visually and easily inspect oil quantity and oil contamination in a state of removing a cowl. <P>SOLUTION: A propulsion unit 6 is supported on a hull 1 through a swivel bracket 33, and an engine 9 to provide force for propulsion is arranged in a cowl of the propulsion unit 6. An oil inspection device 300 with which oil in an oil reservoir D is visually checked is arranged. The oil inspection device 300 is arranged where the oil in the oil reservoir is visually checked in a state of the cowl being removed, and has a mounting rubber body 301 to be press- fitted in the engine 9, and an inspection unit 304 constituted of a glass window 302 and an detection plate 303 held by the mounting rubber body 301. An detection surface 303a1 of the detection plate 303 has a predetermined angle against an oil level L, and roughly orthogonal with a line of sight to visually check through the window 32. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor equipped with an oil inspection device.

[0002]

2. Description of the Related Art Generally, in an outboard motor, a propulsion unit is supported by a hull via a swivel bracket, an engine for obtaining a driving force for propulsion is arranged in a cowl of the propulsion unit, and an oil storage chamber of the engine is provided. Some are equipped with an oil inspection device for visually confirming the stored oil.

Conventionally, in order to confirm whether or not the engine oil amount is at a set oil level, an inspection window type,
The oil level is checked by methods such as stick type and screw type.

[0004]

However, for small outboard motors, the stick type, screw type, etc. methods are complicated in structure, and the inspection window type is preferred because of its simple structure. It must be installed in an easily visible position. Further, the oil inspection device needs to be capable of visually inspecting the amount of oil and visually inspecting the dirt of the oil.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an outboard motor in which the amount of oil and the oil stain can be easily visually inspected with the cowl removed. is there.

[0006]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to the first aspect of the present invention, the propulsion unit is supported on the hull via the swivel bracket, the engine for obtaining the driving force for propulsion is arranged in the cowl of the propulsion unit, and the engine is provided with an oil storage chamber. In an outboard motor equipped with an oil inspection device that allows you to visually check the stored oil,
The oil inspection device is arranged at a position where the oil in the oil storage chamber can be visually observed with the cowl removed, and the oil inspection device includes a mounting rubber body press-fitted into the engine and a holding rubber body mounted on the mounting rubber body. An inspection unit consisting of a glass window and a detection plate, the detection surface of the detection plate having a predetermined angle with respect to the oil surface, and being substantially orthogonal to the line of sight viewed through the glass window. It is a characteristic outboard motor.

According to the first aspect of the invention, since the detection surface of the detection plate has a predetermined angle with respect to the oil surface, the oil level can be easily confirmed visually. Further, since the detection surface of the detection plate is substantially orthogonal to the line of sight viewed through the glass window, it is possible to easily visually check the oil stain from the color of the oil.

According to a second aspect of the present invention, the oil storage chamber is formed by an oil pan, and a drop prevention stopper extending to a position below the detection plate is formed in the oil pan.
The outboard motor according to claim 1, wherein a gap is provided between the fall prevention stopper and the detection plate.

According to the second aspect of the present invention, the drop prevention stopper of the oil pan can prevent the inspection unit from falling, and a gap is provided between the fall prevention stopper and the detection plate. The oil level does not rise from the drop prevention stopper to the detection plate, allowing accurate visual inspection of the oil level.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an outboard motor of the present invention will be described in detail with reference to the drawings. 1 is a side view of the outboard motor, FIG. 2 is a front view of the outboard motor, FIG. 3 is a plan view of the outboard motor, FIG. 4 is a vertical sectional view of a case portion of the outboard motor, and FIG. 6 is a front view of the engine part of the outboard motor, FIG. 7 is a plan view of the engine part of the outboard motor, and FIG. 8 is a plan view of the outboard motor with the fuel tank removed. 9 is a side view of the engine section of the outboard motor, FIG. 10 is a rear view of the engine section of the outboard motor, FIG. 11 is a plan view of the fuel tank, FIG. 12 is a front view of the cylinder head showing the breather chamber, and FIG. Is an enlarged view of the breather chamber of the cylinder head, and FIG. 14 is XIV- of FIG.
FIG. 15 is a sectional view taken along line XIV-XV in FIG. 13, FIG. 15 is a sectional view taken along line XVI-XVI in FIG. 13, and FIG. 17 is a front view of a head cover showing a breather chamber. 18 is a side view of the head cover, FIG. 19 is a plan view of the head cover, FIG. 20 is a rear view of the head cover, and FIG.
1 is a sectional view taken along the line XXI-XXI of FIG. 17, FIG. 22 is an enlarged view of the breather chamber portion of the head cover, FIG. 23 is a sectional view of the inspection unit, and FIG. 24 is XXIV-XXIV of FIG.
2 is a sectional view taken along the line, FIG. 25 is a plan view of the detection plate, FIG.
6 is a sectional view taken along line XXVI-XXVI in FIG.

At the stern of the hull 1 of a small boat, there is a transom board 1a. The transom board 1a holds the clamp bracket 3 of the outboard motor 2 from above,
It is fixed by the tightening member 4. The clamp bracket 3 is provided with a swivel bracket 33 via a tilt shaft 5, and the propulsion unit 6 uses the tilt shaft 5 as a fulcrum.
Is provided so that it can be tilted up.

The propulsion unit 6 includes a top cowl 6A,
It has a bottom cowl 6B, an upper case 6C, and a lower case 6D. Top cowl 6A and bottom cowl 6
The engine 9 and the like are housed inside B. A choke knob 10 and a starter handle 11 project from the front side of the top cowl 6A, and a fuel cap 12 projects from the upper side. A pair of left and right air intakes 34 are formed in the upper portion of the top cowl 6A, and the air introduced from the air intakes 34 cools the engine 9.

A carrying handle 13 is provided on the upper rear side of the upper case 6C, and the propulsion unit 6 can be rotated 180 degrees to move from forward to backward or from backward to forward by the carrying handle 13.

Further, a bar-shaped steering handle 7 protruding forward is attached to the left side surface of the bottom cowl 6B, and a shift lever 8 for connecting the propulsive force and switching it to neutral is attached to the right side surface.

The drive shaft 15 driven by the engine 9 extends substantially vertically downward in the upper case 6C and the lower case 6D. The upper case 6C and the lower case 6D are assembled by a tightening bolt 16.

A small diameter bevel gear 17 is fixed to the lower end of the drive shaft 15, and this bevel gear 17 meshes with a large diameter bevel gear 18. The bevel gear 18 is rotatably supported by the lower case 6D via a bearing 19 to reduce the rotation of the drive shaft 15.

The propeller housing 20 is fixed to the rear end of the lower case 6D by a plurality of bolts 21. A propeller shaft 22 penetrates the propeller housing 20 in the front-rear direction, and an intermediate portion of the propeller shaft 22 is rotatably supported by the propeller housing 20 via a bearing 23.

At the rear end side of the propeller shaft 22, a boss portion 25a of a propeller 25 is fitted and fixed integrally by a nut 26. Boss 25a and collar 27
Are integrated via a rubber damper 28 and a collar 27
Is spline-engaged with the rear end of the propeller shaft 22, so that the propeller 25 rotates integrally.

Above the propeller 25, the propeller 2
A cavity plate 30 is attached to the lower case 6D by bolts 31 so as to be close to the outer periphery of the lower casing 5. An exhaust passage 32 is formed in the upper case 6C and the lower case 6D, and an outlet 32a of the exhaust passage 32 is formed in the lower front portion of the cavity plate 30.

A dog clutch 40 is provided on the front end side of the propeller shaft 22 so as to be movable in the axial direction, and is biased by a spring 41 so as to always come into contact with the shift pin 42. The shift pin 42 is shift-operated by the shift rod 50. The shift rod 50 has an upper portion 50.
It consists of a and a lower part 50b.
Can be connected by connecting means 60.

When the shift lever 8 is shifted, the shift rod 50 moves up and down around the shift shaft 55 as a fulcrum via the link 56, and the shift pin 42 is pushed by the operating portion 50b1 provided in the lower portion 50b. Then, the clutch convex portion 40a of the dog clutch 40 is released from the mesh with the clutch concave portion 18a of the bevel gear 18, and the rotation of the propeller shaft 22 is stopped.

On the other hand, if the operating portion 50b1 does not push the shift pin 42, the dog clutch 40 is pushed by the spring 41 at this connection position, and the clutch convex portion 40a of the dog clutch 40 becomes the clutch concave portion 18 of the bevel gear 18.
The propeller shaft 22 is integrally rotated by meshing with a.

The upper portion 50a and the lower portion 50 of the shift rod 50
The connecting means 60 for connecting b is a pair of tightening plates 61.
And a tightening bolt 63. This shift rod 5
The lower part 50b is positioned on the pair of tightening plates 61 while the pair of tightening plates 61 are temporarily fixed to the upper part 50a of 0, the upper part 50a and the lower part 50b are positioned at predetermined positions, and the pair of tightening bolts 63 are used. Then, the tightening plate 61 is tightened and fixed.

Work openings 70a and 70b are provided at a pair of left and right facing positions at a portion of the case corresponding to the connecting portion between the upper portion 50a and the lower portion 50b of the shift rod 50.

In the upper case 6C, which is the case of the propulsion unit 6, the upper portion 6C1 of the portion where the drive shaft 15 is arranged has a circular cross section, and the lower portion 6C2 has a substantially wing cross section in the front-rear direction. Opening 70 for work
a and 70b are provided.

The work openings 70a and 70b are used for the lid member 7.
1, 72 can be closed, and the lid members 71, 7
2 is made of a rubber member, and the working openings 70a, 70b are sealed by lid members 71, 72.

The upper portion of the drive shaft 15 located behind the shift rod 50 is integrally rotatably connected to the crankshaft 100 of the engine 9, and the lower portion thereof is axially supported by the lower case 6D via a bearing 81. There is.
The drive shaft 15 drives the water pump 82, and water is sucked into the water passage 84 from the water hole 83 formed in the lower case 6D. Water discharged from the water pump 82 is supplied from the water passage 85 to the engine 9 via the water pipe 86.

The upper case 6C of the propulsion unit 2 is
The swivel bracket 33 is rotatably supported by the bearing portion 33 a, and the propulsion unit 2 can be rotated 180 degrees with respect to the swivel bracket 33 by holding the carrying handle 13 to change the forward and reverse positions.

The engine 9 of this embodiment is constructed as shown in FIGS. 6 to 26 and is a single cylinder four-cycle engine. This engine 9 has a crankcase 10
The crankshaft 100, which includes 5, a cylinder body 102, a cylinder head 103, and a head cover 104 and which is vertically arranged, is rotatably supported by the cylinder body 102 and the crankcase 105. The crankcase 105 has an oil storage chamber D and constitutes an oil pan.

The cylinder body 102 has a piston 10
6 is movably provided, the piston 106 is connected to the crankshaft 100 via a piston pin 107 and a connecting rod 108, and the movement of the piston 106 rotates the crankshaft 100. An intake passage 110 and an exhaust passage 111 are formed in the cylinder head 103 so as to open to the combustion chamber 112, and the respective openings are opened and closed by an intake valve 113 and an exhaust valve 114.

The combustion chamber 112 is formed by the cylinder body 102, the piston 106, and the cylinder head 103. Air is introduced from the intake silencer 161 into the intake passage 110, and fuel is supplied from the fuel supply device 115. Fuel is supplied to the fuel supply device 115 from a fuel tank 116 via a fuel hose 117. Further, the exhaust passage 111 communicates with an exhaust passage 118 formed in the crankcase 105, and the exhaust gas passes through the exhaust passage 118 and the upper case 6C and the lower case 6D.
The gas is exhausted through the exhaust passage 32 formed in the.

Cylinder head 103 and head cover 10
4 are joined by sandwiching the gasket 200 therebetween, and are fixed by tightening with a tightening bolt 201. Cylinder head 103
In this case, as shown in FIGS. 12 to 16, breather recesses 103a to 103c are formed at three positions. A groove 103d1 is formed in the wall portion 103d between the breather recess 103a and the breather recess 103b.
1, the breather recess 103a and the breather recess 103b
And are communicated. A groove 103f1 is formed in the wall 103f between the breather recess 103c and the external recess 103e, and the groove 103f1 allows the breather recess 103c to be formed.
And the external recess 103e communicate with each other.

The cylinder head 103 has a nipple 20.
2 is attached to communicate with the breather recess 103a, and the nipple 202 communicates with the intake silencer 161 via the hose 203.

The head cover 104 is shown in FIGS.
2, the breather recesses 104a-10
4c is formed. Further, the groove 104 is formed in the wall portion 104d between the breather recess 104a and the breather recess 104b.
d1 is formed, and the breather recess 104a and the breather recess 104b communicate with each other by the groove 104d1. A groove 104e1 is formed in the wall portion 104e between the breather recess 104a and the breather recess 104c, and the groove 104e1 connects the breather recess 104a and the breather recess 104c. Also, the breather recess 104b
The groove 103 on the wall 103g between the outer recess 103f and the outer recess 103f.
g1 is formed, and the groove 103g1 connects the breather recess 103b and the external recess 103f.

By joining the cylinder head 103 and the head cover 104 with the gasket 200 sandwiched therebetween, the breather chamber C1 is formed by three breather recesses 103a to 103c and three breather recesses 104a to 104c.
To C3 are formed, and the external recess 103e and the external recess 1 are formed.
The valve chamber C4 is formed by 03f.

Therefore, the gas containing the oil component passes from the valve chamber C4 to the breather chamber C3 through the groove 103f1 at the bottom.
And then into the breather chamber C1 via the groove 104e1, into the breather chamber C2 via the groove d1 and into the breather chamber C1 via the groove 103d1. The gas containing the oil thus flows as shown by the arrow in FIG. 12, whereby the oil is separated, and the separated oil drops from the groove 104g1 and is returned to the valve chamber C4. On the other hand, the gas from which the oil has been separated is the breather chamber C1.
Is returned to the intake silencer 161 via the nipple 202 and the hose 203.

As described above, since the breather chambers C1 to C3 are formed by the cylinder head 103 and the head cover 104, the requirement of the breather chamber can be sufficiently secured. Further, since the communication between the breather chambers C1 to C3 is formed by the groove 103d1, the groove 104d1, and the groove 104e1 on the mating surface, the breather chambers C1 to C3 can be easily formed by a mold and the molding is easy.

A drive gear 120 is provided on the crankshaft 100, and the drive gear 120, as shown in FIG.
The driven gear 121 meshes with the driven gear 121.
Thereby rotating the cam shaft 122. The cam shaft 122 has a cam 123a, which corresponds to the intake valve 113 and the exhaust valve 114.
123b is provided, and each cam 123a,
The push lots 124a, 124 are rotated by the rotation of 123b.
b is activated, and the respective rocker arms 125a, 12a
The intake valve 113 and the exhaust valve 114 are opened and closed at a predetermined timing via 5b.

The rocker arms 125a and 125b are attached to the cylinder head 103. In addition, a spark plug 126 is attached to the combustion chamber 11 on the cylinder head 103.
It is attached so as to face 2. Bottom cowl 6B
An opening 127 is formed at a position facing the spark plug 126, and is closed by a cap 128. At the time of maintenance or replacement of the spark plug 126, the cap 128 can be removed and a tool can be inserted through the opening 127 to remove the spark plug 126 without removing the bottom cowl 6B. Further, the opening 127 is provided in the bottom cowl 6B.
Since it is formed on the inclined surface facing downward, and is closed by the cap 128, it is difficult for water to enter, and it is hard to see from the outside and the appearance is good.

The mounting hole 130a of the flywheel 130 is attached to the upper portion of the crankshaft 100, the key 131 is engaged and the nut 132 is tightened and fixed.
30 can rotate integrally with the crankshaft 100.
A protrusion 130b is formed on the upper surface of the flywheel 130 so that an air flow can be generated by the rotation of the flywheel 130.

The flywheel 130 is covered with a flywheel cover 133, and the flywheel cover 13
3 is fixed to the cylinder body 102 by tightening bolts 135 together with the extending portion 134a of the starter cover 134 of the starter 140.

The starter 140 is the primary rotating body 14.
1, a return spring 142, an engagement slider 143, and a driven rotating body 144. The primary rotating body 141 is rotatably supported by the rotation center shaft 146, and the wire 147 wound around the primary rotating body 141 is connected to the starter handle 1.
It is connected to 1. By pulling the starter handle 11, the primary rotating body 141 rotates about the rotation center shaft 146 and is returned to the original position by the return spring 142.

The driven rotating body 144 is the crankshaft 10
The upper part of 0 is fixed by a nut 132. The engagement slider 143 moves due to the rotation of the primary rotary body 141 and engages with the engaging portion 144a of the driven rotary body 144, the driven rotary body 144 rotates integrally with the primary rotary body 141, and the crankshaft 100 is rotated at the time of starting. The engine 9 is forcibly rotated to start the engine 9, and when the engine 9 is started, the engagement slider 143 returns to the original position and the engagement is released.

The rotation center shaft 146 is tightened and fixed to the starter cover 134 by tightening bolts 149. A handle mounting portion 134b is formed on the starter cover 134, and a rubber seal 14 is formed on the handle mounting portion 134b.
8 is provided, and a rubber seal 148 seals between the top cowl 6 </ b> A.

In this embodiment, the starter cover 1
34 to form a partition wall, and the extending portion 134a
A partition wall seal 150 is provided on the outer peripheral portion 134c and the rising portion 134d of the starter cover 134, and the partition wall seal 150 seals between the top cowl 6A.

The starter cover 134 and the partition wall seal 1 are provided inside the cowl formed by the top cowl 6A and the bottom cowl 6B.
The fuel tank chamber A is arranged in the upper part and the engine chamber B is arranged in the lower part. In the fuel tank chamber A,
The fuel tank 116 is arranged, and the engine 9 is arranged in the engine compartment B. In this way, the starter cover 134
And a partition wall is formed by the extending portion 134a,
The fuel tank chamber A and the engine chamber B can be partitioned with a simple and compact structure by using the starter cover 134 by integrating the starter cover 134 and the partition wall without using a special member.

A front end portion 116a of the fuel tank 116 is attached and fixed to the rotation center shaft 146 of the starter 140 with a tightening bolt 147 via a rubber damper 151. Further, the other end portion 11 on the rear side of the fuel tank 116
6b and 116c are attached and fixed by tightening bolts 154 and 155 via rubber dampers 152 and 153. The fuel cap 12 is provided above the fuel tank 116. In this way, the one end portion 116a of the fuel tank 116 is attached and fixed to the rotation center shaft 146 of the starter 140.

Along with the flywheel cover 133, the rotation center shaft 146 is supported by the starter cover 134 that is firmly attached, and the fuel tank 116 is attached by the rotation center shaft 146 of the starter 140 that is originally strongly supported. It is possible to firmly attach the fuel tank 116 with a compact structure without using any attachment member.

Further, as shown in FIGS. 6, 9 and 11, the fuel tank 116 extends a part thereof to the front side to cover the substantially upper half of the starter 140, and the tank capacity portion 1 is provided.
16d is arranged, and a part of the fuel tank 116 can be extended to easily secure the tank capacity.

In addition, in this embodiment, the starter 1
Above 40 is a part of the tank capacity part 1 of the fuel tank 116.
The fuel tank chamber A and the engine chamber B are communicated with each other by forming a communication hole 170 in the extended portion 134a of the starter cover 134 which is covered with 16d and is covered with a part of the fuel tank 116. A gap 180 is formed between the fuel tank 116 arranged in the fuel tank chamber A and the starter cover 134 that constitutes the partition wall.
It is possible to introduce outside air to zero.

Outside air is introduced into the fuel tank chamber A through a pair of left and right air intakes 34, and this outside air is supplied to the fuel tank 11.
6 and the top cowl 6A can be introduced into the engine compartment B through the clearance 180 through the clearance 181 and the communication hole 170.

The outside air to the engine room B is introduced from the communication hole 170 by the rotation of the flywheel 130, further passes through the opening 133a of the flywheel cover 133 to cool the cylinder body 102, and further the cylinder head 103.
To cool.

As described above, the gap 180 is formed between the fuel tank 116 and the extending portion 134a of the starter cover 134 formed by the partition wall, and the outside air is communicated with the partition hole 170 of the partition wall.
By adopting a maze structure introduced into the engine room B via the air conditioner, it is possible to prevent the outside air containing water from adversely affecting the engine 9 to improve the cooling performance, and to improve the cooling performance. The high temperature can be suppressed.

Further, by introducing the outside air into the gap 180, the water contained in the outside air can be removed, the heat transfer from the engine 9 can be suppressed, and the engine side surface of the fuel tank 116 can be effectively cooled. .

Further, a part of the fuel tank 116 is extended above the starter 140 to cover it by overhanging,
By forming a communication hole 170 for introducing air in the starter cover 134 covering the starter 140 and covering the communication hole 170 with a part of the fuel tank 116, it is easy to secure the tank capacity. Further, by covering the communication hole 170 formed in the starter cover 134 with a part of the fuel tank 116, the fuel tank 1 is exposed to the outside air introduced into the communication hole 170.
16 can be cooled effectively.

Further, in this embodiment, FIG. 7 and FIG.
As shown in 0, an oil inspection device 300 for visually recognizing the oil stored in the oil storage chamber D of the engine 9 is provided. The oil inspection device 300 is arranged at a position where the oil in the oil storage chamber D can be visually observed with the top cowl 6A removed.

The oil inspection device 300 is shown in FIGS.
6, the mounting rubber body 3 is press-fitted into the engine 9.
01 and the glass window 3 held by the mounting rubber body 301
02 and detection plate 303 inspection unit 30
Have four. The outer periphery of the glass window 302 is the mounting rubber body 3
01, the detection plate 303 is an annular sheet metal 30.
It is held by the mounting rubber body 301 by means of 5.

The detection plate 303 is formed by punching a metal plate, and has an annular mounting portion 303a and a circular detection portion 30.
3b and a holding portion 303c. Annular mounting part 303
The a is engaged with the annular sheet metal 305 and held by the mounting rubber body 301, and the detecting portion 303b is held by the holding portion 303c at a predetermined angle with respect to the glass window 302.

The oil storage chamber D has a cylinder body 102.
And the crankcase 105, and the crankcase 105 constitutes an oil pan. Inspection unit 30
As shown in FIG. 10, the mounting rubber body 301 is attached to the cylinder body 10 before the crankcase 105 is assembled.
2 is mounted by press-fitting it from below into a mounting recess 102a formed in the lower part of the crankcase 105.

The crankcase 105 is formed with a fall prevention stopper 105a extending below the detection portion 303b of the detection plate 303.
A gap S is provided between 5a and the detector 303b.

With the inspection unit 304 attached,
As shown in FIG. 10, the glass window 302 is in a horizontal state, the detection surface 303b1 of the detection plate 303 has a predetermined angle with respect to the oil surface L, and is substantially orthogonal to the line of sight viewed through the glass window 302. ing. The lower end of the detection surface 303b1 indicates the lower limit level position L1, the upper end of the detection surface 303b1 indicates the upper limit level position L2, and when the oil decreases to the lower limit level position L1, the oil is replenished until it reaches the upper limit level position L2.

As described above, since the detection surface 303b1 of the detection plate 303 has a predetermined angle with respect to the oil surface L, the oil level can be easily visually confirmed. Further, since the detection surface 303b1 of the detection plate 303 is substantially orthogonal to the line of sight viewed through the glass window 302, it is possible to easily visually check the oil stain from the color of the oil.

The inspection unit 304 can easily attach the inspection unit 304 to the engine 9 by press-fitting the mounting rubber body 301 into the mounting recess 102a of the cylinder body 102. Further, the fall prevention stopper 105a of the crankcase 105 can prevent the inspection unit 304 from falling.

In addition, since the gap S is provided between the fall prevention stopper 105a and the detection portion 303b of the detection plate 303, when the oil decreases and is slightly below the top position of the fall prevention stopper 105a, Even if the surface tension causes the oil to rise to the top of the fall prevention stopper 105a, the raised oil does not rise from the fall prevention stopper 105a to the detection portion 303b due to the capillary phenomenon, and the oil surface L is lower than the lower limit level position L1. It is located in the lower position, which allows you to see the exact oil level.

[0066]

As is apparent from the above description, in the invention described in claim 1, the detection surface of the detection plate has a predetermined angle with respect to the oil surface, so that the oil level can be easily visually confirmed. can do. Further, since the detection surface of the detection plate is substantially orthogonal to the line of sight viewed through the glass window, it is possible to easily visually check the oil stain from the color of the oil.

According to the second aspect of the present invention, the fall prevention stopper of the oil pan can prevent the inspection unit from falling, and since a gap is provided between the fall prevention stopper and the detection plate, the oil is prevented from falling. An accurate oil level can be visually checked without rising from the stopper to the detection plate.

[Brief description of drawings]

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

FIG. 2 is a front view of an outboard motor.

FIG. 3 is a plan view of an outboard motor.

FIG. 4 is a vertical sectional view of a case portion of the outboard motor.

FIG. 5 is a front view of a case portion of the outboard motor.

FIG. 6 is a cross-sectional view of an engine portion of the outboard motor.

FIG. 7 is a plan view of an engine unit of the outboard motor.

FIG. 8 is a plan view showing a state in which a fuel tank of the outboard motor is removed.

FIG. 9 is a side view of the engine section of the outboard motor.

FIG. 10 is a rear view of the engine section of the outboard motor.

FIG. 11 is a plan view of a fuel tank.

FIG. 12 is a front view of a cylinder head showing a breather chamber.

FIG. 13 is an enlarged view of a breather chamber portion of a cylinder head.

14 is a sectional view taken along line XIV-XIV in FIG.

15 is a sectional view taken along line XV-XV in FIG.

16 is a cross-sectional view taken along line XVI-XVI of FIG.

FIG. 17 is a front view of the head cover showing the breather chamber.

FIG. 18 is a side view of the head cover.

FIG. 19 is a plan view of the head cover.

FIG. 20 is a rear view of the head cover.

21 is a cross-sectional view taken along line XXI-XXI of FIG.

FIG. 22 is an enlarged view of the breather chamber portion of the head cover.

FIG. 23 is a sectional view of the inspection unit.

24 is a sectional view taken along line XXIV-XXIV in FIG.

FIG. 25 is a plan view of a detection plate.

FIG. 26 is a cross-sectional view taken along the line XXVI-XXVI of FIG. 25.

[Explanation of symbols]

1 hull 2 outboard motor 6 propulsion unit 6A Top cowl 6b bottom cowl 9 engine 33 swivel bracket 300 oil inspection device 301 mounting rubber body 302 glass window 303 Detection plate 304 Inspection unit 303b1 Detection surface of detection plate 303 D oil storage chamber L oil surface

Claims (2)

[Claims] 1. A propulsion unit is supported on a hull via a swivel bracket, an engine for obtaining a driving force for propulsion is arranged in a cowl of the propulsion unit, and oil stored in an oil storage chamber of the engine is visually recognized. In an outboard motor equipped with an oil inspection device, the oil inspection device is arranged at a position where the oil in the oil storage chamber can be visually observed with the cowl removed, and the oil inspection device is press-fitted into an engine. An inspection unit including a rubber body, a glass window held by the attached rubber body, and a detection plate is provided, and the detection surface of the detection plate has a predetermined angle with respect to the oil surface, and through the glass window. An outboard motor characterized by being substantially orthogonal to the line of sight to be seen. 2. The oil storage chamber is formed by an oil pan,
The outboard motor according to claim 1, wherein a drop prevention stopper extending to a position below the detection plate is formed in the oil pan, and a gap is provided between the drop prevention stopper and the detection plate.