JPH0219038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an outboard motor, and particularly to a mounting structure for an internal combustion engine housed in a cowling.

[Prior Art] As described in Japanese Utility Model Publication No. 47-27113, it is known that an outboard motor has a cowling attached to the upper end of the casing, and an internal combustion engine is disposed within this cowling. .

This internal combustion engine needs to be firmly mounted on the casing side, so conventionally a support flange is integrally formed on the inner periphery of the upper opening of the casing, and the cylinder block, crankcase, etc. are bolted onto this support flange. By doing this, the internal combustion engine was fixed.

[Problems to be Solved by the Invention] However, according to the above structure, the support flange is formed integrally with the upper end opening of the casing, and forms a fixed part compatible with the above internal combustion engine. One type of casing is required for each type of internal combustion engine, and there is a problem in that a different type of internal combustion engine cannot be installed.

On the other hand, when a four-stroke internal combustion engine is used as the internal combustion engine, a lubricating oil storage chamber is required to accommodate lubricating oil.

The lubricating oil storage chamber is usually located below the cylinder block or crankcase, and has a certain capacity.
The lubricating oil storage chamber has a concave lower wall formed by an oil pan, which is housed in the casing.

In the conventional case, the upper cover of the oil pan was also used by the internal combustion engine fixed to the support flange of the casing.

However, with this structure, when the internal combustion engine is removed from the casing for maintenance and inspection, the upper part of the oil pan remains open, so there is a problem that dust and other foreign matter can enter the oil through this opening. be.

The present invention was developed based on these circumstances, and its purpose is to enable installation even if the internal combustion engine model changes, and to prevent dust and foreign matter from entering the lubricating oil storage chamber even after the internal combustion engine is removed. The aim is to provide an outboard motor that is free from intrusion.

[Means for Solving the Problems] Therefore, in the present invention, a support plate is detachably attached to the upper end opening of the casing to partition the inside of the casing and the inside of the cowling, and a fastener is attached to the upper surface of the support plate. The internal combustion engine is removably mounted and fixed through the support plate, and the upper end opening of the oil pan is overlapped with the lower surface of the support plate, and the internal combustion engine is installed and removed through another fastener that passes through the support plate from the internal combustion engine side. The oil pan can be fixed by hanging, and a fastener for fixing the oil pan is provided at a position below the internal combustion engine.

[Function] According to the present invention, a support plate separate from the casing is attached to the upper opening of the casing, so if the model of the internal combustion engine is changed, the support plate can be changed, and the casing can be attached to the model of the internal combustion engine. It can be applied to a wide variety of internal combustion engines.

Moreover, the internal combustion engine and oil pan are fixed to the support plate via separate fasteners, so even if the internal combustion engine is removed from the support plate, the lower oil pan remains covered by the support plate. This prevents foreign matter such as dust from entering the oil pan or lubricating oil.

In this case, when the internal combustion engine is fixed on the support plate, the fasteners that fix the oil pan to the support plate are inserted under the internal combustion engine, so after removing the internal combustion engine, Otherwise, it will be impossible to remove the oil pan. Therefore, even when the internal combustion engine is removed, the upper end of the oil pan is covered by the support plate until just before the oil pan is removed, thereby more reliably preventing foreign matter from entering the oil pan.

[Example] The present invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 denotes an outboard motor, which is attached via a bracket 2 to the transom of a boat (not shown).

The outboard motor 1 is constructed by attaching a cowling 6 to the upper end of a casing 5 formed by connecting an aluminum alloy Atsupa casing 3 and a lower casing 4.

A support plate 8 is detachably attached to the upper end opening of the Atsupa casing 3 via bolts 7 . The support plate 8 has a shape matching the upper end opening of the Atsupa casing 3, and closes the upper end opening of the Atsupa casing 3 to partition the inside of the casing 5 and the inside of the cowling 6.

An engine 9 is mounted on the upper surface of the support plate 8, and this engine 9 is housed within the cowling 6.

The engine 9 is a water-cooled four-stroke two-cylinder engine, and the cylinder block 10 has one
A pair of cylinders 11a, 11b are formed vertically in parallel, and these cylinders 11a, 11b are arranged with cylinder axes extending in the front-rear direction. Sleeves 12, 12 are attached to the inner surface of each cylinder 11a, 11b, and pistons 13, 13 are slidably accommodated in these sleeves 12, 12.

A crankcase 14 is connected to the front end surface of the cylinder block 10, and a crank chamber 15 is formed within the crankcase 14 and connected to the cylinders 11a and 11b. A crankshaft 16 extending in the vertical direction is housed in the crank chamber 15, and the crankshaft 16 is connected to a connecting rod 18 by means of crank pins 17, 17.
It is connected to the pistons 13, 13 via 18.

The lower end of the crankshaft 16 is connected to the drive shaft 1 rotatably passing through the front end of the support plate 8.
The drive shaft 19 is spline-engaged to the upper end of the propeller shaft 20, and the drive shaft 19 rotates a propeller 21 via a propeller shaft 20.

A cylinder head 22 is attached to the rear end surface of the cylinder block 10, and combustion chambers 23, 23 are formed in the cylinder head 22, and are connected to the cylinders 11a, 11b.

A head cover 24 is attached to the rear end surface of the cylinder head 22.
A camshaft 26 for opening and closing an intake valve and an exhaust valve (not shown) is installed in a camshaft housing chamber 25 formed between the head cover 2 and the head cover 24 along the vertical direction.

At the lower end of the cylinder head 22, an oil pump 27 is rotatably driven by a camshaft 26.
A suction port of this oil pump 27 is connected to a suction port 29 formed on the lower surface of the cylinder block 10, that is, on the surface that abuts the support plate 8, through a suction passage 28 in the cylinder head 22. It's summery. The discharge port of the oil pump 27 is connected to a first oil delivery passage 30 provided below the lower cylinder 11a, and the tip of this first oil delivery passage 30 is connected to the lower end shaft support of the crankshaft 16. is communicated with. Further, a second oil delivery passage 31 is provided above the upper cylinder 11b, and this second oil delivery passage 31 and the first oil delivery passage 30 are arranged in the cylinder block 10 along the vertical direction. They are communicated via a communication path 32 provided.

One end of the second oil delivery path 31 is connected to the crankshaft 1
6, and the other end is connected to the upper end shaft support of the camshaft 26.

Furthermore, on the lower surface of the cylinder block 10,
As shown in FIGS. 5 and 6, the combustion chamber 23,
An exhaust outlet 33 connected to the exhaust port 23 is open, and a recess 34 is provided adjacent to the exhaust outlet 33. A communication port 35 connected to the crank chamber 15 is opened at the bottom of the recess 34, and the recess 34 is connected to the cylinder block 10 and the cylinder head 22 through oil outflow holes 36 and 37 provided at the lower part of the abutment surface between the cylinder block 10 and the cylinder head 22. and communicates with the lower part of the camshaft housing chamber 25.

At a plurality of locations around the lower surface of the cylinder block 10 and the crankcase 14, there are sixth
As shown in the figure, screw holes 38 are provided,
The support plate 8 is provided with insertion holes 39 that face the screw holes 38. Bolts 40 are inserted as fasteners into the insertion holes 39 of the support plate 8 from below, that is, from the casing 5 side, and these bolts 40 are inserted into the threaded holes 39.
The cylinder block 10 and the crankcase 14 are removably fixed to the support plate 8 by being screwed into them. Therefore, the engine 9 is rigidly mounted on the upper surface of the support plate 8.

On the other hand, an exhaust port 41 connected to the exhaust outlet 33 is provided approximately in the center of the support plate 8, and an oil return hole 4 that opens into the recess 34 is provided.
2 have been established. Further, on the lower surface of the support plate 8, a joint surface 43 (the part hatched with broken lines in FIG. 7) is formed around the exhaust port 41 and the oil return hole 42. An oil pan 44 that accommodates lubricating oil for the engine 9 is attached to the.

As shown in FIG. 2, this oil pan 44 has its upper open end surface abutted against the joint surface 43 on the lower surface of the support plate 8, and is attached to the support plate 8 by a plurality of bolts 45 as other fasteners. connected. Therefore, the oil pan 44 is removably suspended and fixed to the lower surface of the support plate 8.
It is substantially housed within the Atsupa casing 3.

In this case, the bolt 4 that fixes the oil pan 44
5... is the support plate 8 from the upper engine 9 side.
The oil pan 44 is screwed into the upper open end surface of the oil pan 44 through the oil pan 44 . As is clear from FIGS. 2 and 5, these bolts 45 are provided at positions that are inserted into the lower side of the engine 9.
Bolt 4 must be removed after engine 9 is removed.
5 cannot be attached or detached.

This oil pan 44 communicates with the engine 9 side via an oil return hole 42.

Additionally, a drain hole 46 is provided on the bottom of the oil pan 44.
has been established. The bottom of the oil pan 44 where the drain hole 46 is opened is a bulge 4 formed on the rear surface of the Atsupa casing 3 and extending rearward.
7 with a gasket 48 interposed therebetween. A through hole 49 is formed in the bulging portion 47 and faces the drain hole 46 so as to match with the drain hole 46.
A drain bolt 50 is screwed into the drain hole 46 through the through hole 49 .

As shown in FIG. 8, approximately in the center of the oil pan 44, an exhaust pipe passage 52 is provided along the vertical direction and is partitioned from the inside of the oil pan 44 by an isolation 51. The upper end opening of the through passage 52 is adapted to surround the exhaust port 41 formed in the support plate 8. As shown in FIG. 3, an exhaust pipe 53 is inserted into this through passage 52, and the upper end of this exhaust pipe 53 is connected to the exhaust port 41, and the lower end is inside the Atsupa casing 3. It is opened to

Further, the front end portion of the partition wall 51 is connected to the oil pan 4.
4, and a cooling water passage 54 is integrally provided in this portion along the vertical direction. The upper end opening of the cooling water passage 54 is connected to a water jacket 56 in the cylinder block 10 and the cylinder head 22 via a communication hole 55 formed in the support plate 8. Further, a water tube 58 is connected to the lower end opening of the cooling water passage 54 via a seal 57, and this water tube 58 is connected to a water tube 58 which is opened on both sides of the lower casing 4 via a water pump (not shown). It is connected to inlet 59...

Further, a suction port body 60 connected to the oil suction port 29 of the cylinder block 10 is attached through the support plate 8.
is suspended within the oil pan 44. A suction pipe 62 equipped with a strainer 61 is connected to the lower end of the suction port body 60 .

The operation of the embodiment with such a configuration will be explained.

In the above embodiment, the support plate 8 is arranged to close the upper end opening of the Atsupa casing 3.
, and the engine 9 is removably fixed to the upper surface of the support plate 8, so the engine 9 is fixed to the Atsupa casing 3 via the support plate 8.

Therefore, the shape of the Atsupa casing 3 is not affected by the size or shape of the cylinder block 10, etc., and therefore, when the model of the engine 9 changes, the casing 5 can be changed simply by replacing the support plate 8. There's no need. That is, when the model of the engine 9 changes, the mounting position of the engine 9 to the support plate 8 and the number of mounting points change, so a corresponding support plate 8 is required, but the mounting position of the support plate 8 and Atsupa casing 3 changes. There is no need to change the casing 5 or the number of attachment points.

Therefore, a single type of casing 5 can be applied to various types of engines, and the number of types of casings to be prepared can be reduced.

In addition, since the shape of the Atsupa casing 3 is no longer affected by the size and shape of the cylinder block 10, etc., the oil pan 4 is placed inside the Atsupa casing 3.
4, a sufficient installation space for the oil pan 44 is secured, and the capacity of the oil pan 44 can also be increased.

In addition, in order to remove the engine 9 from the Atsupa casing 3, the cowling 6 must be removed and the engine 9
After exposing the support plate 8, loosen the bolts 7 and lift the support plate 8 upward. By doing so, the engine 9 and the oil pan 44 can be removed from the upper casing 3 side together with the support plate 8. For example, when performing maintenance and inspection inside the cylinder block 10, the engine 9 can be removed from the support plate 8 by loosening the bolts 40.

In this case, the oil pan 44 is suspended by the support plate 8 separately from the engine 9, and the upper end opening is kept closed by the support plate 8, so that the oil pan 44 is free of dirt, dust, etc. No foreign objects can enter.

At the same time, when the engine 9 is fixed to the upper surface of the support plate 8, the bolts 45 that fix the oil pan 44 to the support plate 8...
Since the bolts 45 have entered the underside of the engine 9, the bolts 45 cannot be loosened until the engine 9 is removed, making it impossible to remove the oil pan 44.

Therefore, even when the engine 9 is removed, the upper end opening of the oil pan 44 is covered by the support plate 8 until just before the oil pan 44 is removed. This ensures that foreign matter does not enter the oil pan 44. It can be prevented.

Furthermore, there is no risk of a large amount of engine oil flowing out from the oil pan 44.

Furthermore, in the case of this embodiment, the support plate 8 is attached to the upper end opening of the Atsupa casing 3 so as to close the opening.
The engine 9 is mounted on the upper surface, and the oil pan 44 is suspended and fixed on the lower surface of the support plate 8. The entire weight of the engine 9 including the oil pan 44 is transferred to the Atsupa casing 3 side via the support plate 8. It will be supported by That is, the weight of the entire engine 9 is distributed substantially uniformly over the upper end opening of the Atsupa casing 3, and no load is locally applied to a portion of the Atsupa casing 3. Therefore, the mounting strength of the engine 9 is improved.

Moreover, as mentioned above, since the engine 9 and the oil pan 44 are fixed to the support plate 8, they can be preassembled externally and attached to the Atsupa casing 3, or they can be integrally assembled. Since it can also be removed from the Atsupa casing 3, work efficiency in the field of assembly is improved.

Note that the engine according to the present invention is not limited to two cylinders, and can be similarly implemented even if it is a single cylinder engine or a multi-cylinder engine with three or more cylinders.

[Effects of the Invention] According to the present invention described in detail above, when the model of the internal combustion engine is changed, it is only necessary to change the support plate, so the casing is no longer restricted by the model of the internal combustion engine, and can be used in various types. It can be directly applied to internal combustion engines.

Furthermore, even if the internal combustion engine is removed from the support plate, the oil pan is covered by the support plate, and the fasteners that secure the oil pan to the support plate are inserted under the internal combustion engine. The internal combustion engine must be removed before
The fasteners cannot be loosened and the oil pan cannot be removed. For this reason, even if the internal combustion engine is removed, until just before removing the oil pan,
Since the upper end of the oil pan is kept covered by the support plate, there is an advantage that foreign matter can be more reliably prevented from entering the oil pan and lubricating oil.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of an outboard motor, and FIG. 2 is a sectional view showing how the internal combustion engine and oil pan are attached to the support plate.
Figure 3 is a sectional view showing how the oil pan is installed, Figure 4 is a bottom view of the oil pan installed on the support plate as seen from the casing side, and Figure 5 is the internal combustion engine installed on the support plate. 6 is a view showing a surface fixed to a support plate of an internal combustion engine, FIG. 7 is a bottom view of the support plate, and FIG. 8 is a plan view of the oil pan. 1... Outboard motor, 5... Casing, 6... Cowling, 8... Support plate, 9... Internal combustion engine (engine), 40, 45... Fastener (bolt),
44...Oil pan.

Claims (1)

[Scope of Claims] 1. An outboard motor in which a cowling is provided at the upper end of the casing, an internal combustion engine is disposed within the cowling, and an oil pan for storing lubricating oil for the internal combustion engine is housed within the casing, comprising: A support plate that partitions the inside of the casing and the inside of the cowling is removably attached to the upper end opening of the casing, and the internal combustion engine is removably placed and fixed on the upper surface of this support plate via a fastener, and the internal combustion engine is also supported. The upper end opening of the oil pan is overlapped with the lower surface of the plate, and the support plate is removably suspended and fixed via another fastener penetrating from the internal combustion engine side, and this fastener for fixing the oil pan is fixed. , an outboard motor characterized in that it is installed in a position below the internal combustion engine.