JP3143962B2 - Oil pan baffle structure of 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 oil pan baffle structure for preventing foaming of lubricating oil stored in an outboard motor oil pan.

[0002]

2. Description of the Related Art Generally, an engine of an outboard motor is mounted on a casing with a crankshaft standing upright, and a drive shaft extending downward from a lower end of the crankshaft drives a propeller.

[0003] When this engine is a four-stroke engine, an oil pan is provided below the engine, and lubricating oil stored in the oil pan is pumped up by an oil pump and sent to various parts of the engine for lubrication. Then, it flows down from the lower part of the engine and returns to the oil pan.

[0004] As described above, the engine of the outboard motor is installed vertically, so that the lubricating oil in the engine cannot spontaneously fall into the oil pan unlike the engine of an automobile or the like. For this reason, a drainage passage is provided at the bottom of the engine to guide lubricating oil in the engine to the oil pan. As a result, the lubricating oil supplied to the entire engine flows into the oil pan at one point and vigorously from the above-described oil discharge passage, and foams the lubricating oil stored in the oil pan, so that the bubbles are sucked into the oil pump. As a result, the lubrication state of the engine may be deteriorated.

In order to solve this problem, in a four-stroke engine of an outboard motor, a flat baffle plate is provided vertically below an oil discharge passage, and lubricating oil flowing down from the oil discharge passage is once applied to the baffle plate to generate momentum. And then gently pour it into the oil pan.

[0006]

In an outboard motor equipped with a large four-stroke engine, which has been increasing in recent years, the amount of lubricating oil supplied into the engine is large, so that a plurality of engine oil drain passages are provided. For example, the cam chamber and the crank chamber each have a dedicated oil discharge passage.

However, in order to suppress the momentum of the lubricating oil flowing down from these drains, the above-mentioned baffle plates are installed in all the drains, respectively.
It is impossible in terms of structure, assembly, or cost.

Further, in a drainage passage in which the amount of lubricating oil flowing out is particularly large, only one baffle plate cannot sufficiently reduce the momentum of the lubricating oil, causing the lubricating oil in the oil pan to foam. There is a risk.

The present invention has been made in consideration of the above problems, and has a simple and inexpensive structure, and is provided with a plurality of oil drains at the bottom of the engine case or a drain oil with a large amount of lubricating oil flowing out. Another object of the present invention is to provide an oil pan baffle structure of an outboard motor capable of reliably preventing the lubricating oil in the oil pan from foaming even in a four-stroke engine.

[0010]

According to a first aspect of the present invention, there is provided an oil pan baffle structure for an outboard motor according to the present invention. Mounted on the engine holder,
In an oil pan baffle structure of an outboard motor in which lubricating oil supplied to the inside of the engine flows down into an oil pan attached to a lower part of the engine holder through a drainage passage formed at the lowermost part of the engine, A baffle plate is mounted at a position on the flow path where oil lubricating the engine flows down into the oil pan, and an oil pan gasket is sandwiched between the engine holder and the oil pan below the baffle plate and below the baffle plate. The oil pan gasket is formed such that the oil pan gasket has an inner peripheral portion extending inwardly, at least partially overlapping the baffle plate in an oil pan cross-sectional plan view, and the baffle plate and the oil pan gasket. Lubricating oil flowing down from the engine is applied sequentially Than it is. Further, in order to solve the above-described problem, the outboard motor oil pan baffle structure according to the present invention is configured such that the baffle plate is provided at a central portion of the oil pan in a cross-sectional plane view of the oil pan as described in claim 2. The baffle plate is formed at the center of the oil pan in an oil pan cross-sectional plan view and inside the oil pan gasket extension part, as described in claim 3. It is mounted and installed at approximately the center of the open window.

[0011]

In the oil pan baffle structure of the outboard motor according to the present invention, the lubricating oil flowing down from inside the engine is
By sequentially hitting the baffle plate and the oil pan gasket, the momentum is sufficiently reduced before being poured into the oil pan.

[0012]

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

FIG. 2 is a right side view of an outboard motor having an outboard motor oil pan baffle structure according to the present invention. The outboard motor 1 has an engine 5 mounted on a substantially flat engine holder 3 mounted on the uppermost portion of a casing 2 with the crankshaft 4 standing upright. A propeller shaft 8 via a drive shaft 6 and a forward / reverse switching device 7 suspended in
And drives the propeller 9 to have a general layout.

The engine 5 covered by the engine cover 10 is, for example, a large-sized and large-output 4-stroke inline four-cylinder gasoline engine, and an oil pan 11 is provided on a lower surface of the engine holder 3.

The outboard motor 1 is mounted on the stern of a hull 13 by a clamp bracket 12 and has a steering shaft 14 suspended from the clamp bracket 12.
The hull 13 is propelled and the hull 13 is steered.

FIG. 3 is a longitudinal sectional view of the engine 5. The engine 5 includes a cylinder head 15 and a cylinder block 16.
The cylinder head 15 and the cylinder block 1 are formed from the cylinder head 15 and the cylinder block 1.
6 are fixed on the engine holder 3.

Cylinder block 16 and crankcase 1
7, four crank chambers 19a, 19b, 19
c and 19d are defined, where the crankshaft 4 is rotatably supported. Further, four cylinders 20a, 20b, 20c, 2 formed on the cylinder block 16 are provided.
A piston 21 is slidably inserted into 0d,
Since the pistons 21 are connected to the crankshaft 4 by the connecting rods 22, the reciprocating motion of the piston 21 is converted into the rotational motion of the crankshaft 4.

On the other hand, a cam shaft 25 is rotatably supported in a cam chamber 24 defined by the cylinder block 16 and the head cover 18. The camshaft 25 is driven by the crankshaft 4 via a timing belt 26, and the intake and exhaust cams 2 provided on the camshaft 25 are provided.
7 and 28 operate, for example, an SOHC type valve operating mechanism 29 to close the intake and exhaust valves 30 and 31 into the combustion chamber 32 at a predetermined timing.

The intake and exhaust valves 30 and 31 open and close an intake port and an exhaust port (not shown) communicating with the combustion chamber 32 to exchange gas in the cylinder 20 and operate the engine 5.

The oil pump 34 for lubricating various parts of the engine 5 is, for example, a general trochoid pump, and is installed below the lowermost crank chamber 19d and is directly driven by the crankshaft 4. An oil pipe 35 and an oil strainer 36 are sequentially connected to the oil pump 34, and the lubricating oil O stored in the oil pan 11 is purified by the oil strainer 36 and sucked into the oil pump 34. The lubricating oil is supplied to the crankshaft bearings and the cylinders 20a, 20b, 20c, 20d in the crank chambers 19a, 19b, 19c, 19d by an oil supply path (not shown) extending from the oil pump 34.
Further, it is pressure-fed to a camshaft bearing or the like in the cam chamber 24 to lubricate each part.

The crank chambers 19a, 19b, 19c, 19
4d communicate with each other through a communication hole 37. As shown in FIG. 4 (FIG. 1), the lowermost crank chamber 19d has a crank chamber main oil discharge passage 38 connected to the oil pan 11,
Two crank chamber auxiliary oil drain passages 39 are provided as oil passages.

The crank chamber main oil discharge passage 38 is provided, for example, by partially partitioning a water jacket 40 provided around the lowermost cylinder 20d, and provides a centrifugal force when the crank wheel 4a of the crank shaft 4 rotates. The lubricating oil O scattered by the force has a shape that is easy to jump in. Further, the crank chamber sub-discharge passage 39 is formed by utilizing, for example, a dead space in the oil pump 34.

On the other hand, a cam chamber oil drain 41 is provided at the left and right lowermost portions of the cam chamber 24.

The crank chambers 19a, 19b, 19
c, 19d and cylinders 20a, 20b, 20c, 2
The lubricating oil O supplied to Od collects in the lowermost crank chamber 19d through the communication hole 37 and scatters by the centrifugal force on the rotating crank wheel 4a. Returned to bread 11. At this time, the lubricating oil that did not enter the crankcase main oil discharge passage 38 is supplied to the oil pan 1 through the crankcase auxiliary oil discharge passage 39.
Returned to 1. The lubricating oil O supplied to the cam chamber 24 returns to the oil pan 11 from the cam chamber oil discharge passage 41.

A baffle plate 42 made of a metal plate or the like is provided vertically below the opening 38 'of the crankcase main oil discharge passage 38. The baffle plate 42 has, for example, a groove 42a which is recessed and extends in the left-right direction, and lubricating oil flowing down from the opening 38 'is supplied to the baffle plate 42.
After hitting above, it diverges right and left (see FIG. 1) and falls downward.

The oil pan 11 is fixed to the lower surface of the engine holder 3 with a bolt 44 across an oil pan gasket 43. The oil pan gasket 43 is used for the oil pan 11
To seal the contact surface between the motor and the engine holder 3 to prevent leakage of lubricating oil.

FIG. 5 is a diagram showing the V- of the engine holder 3 shown in FIG.
FIG. 6 is a sectional view taken along the line V, and FIG. 6 is a plan view of the oil pan gasket 43 alone. FIG. 1 is a cross-sectional view of FIG.
It is sectional drawing which follows the I line, and has shown one Example of this invention with FIG.

Openings 38 ', 3 of the crank main oil discharge passage 38, the crank auxiliary oil discharge passage 39, and the cam chamber oil discharge passage 41.
9 'and 41' are respectively opened above the position shown by the two-dot chain line in FIG. Oil pan gasket 43
While the engine holder 3 and the oil pan 11 are sealed in a liquid-tight manner, the oil pan gasket 43 has an open window 43 substantially in the center.
c is formed. The oil pan gasket 43 has extended portions 43b, 43b formed by projecting inward at both sides in the width direction, for example, both left and right portions in FIG. It overlaps with both side parts 42b of the baffle plate 42. The groove 42a of the baffle plate 42 is located at the extended portions 43b, 43b of the oil pan gasket 43 so as to straddle the open window 43c of the oil pan gasket 43 and terminates.

The oil pan gasket 43 has, for example, left and right sides of an inner peripheral portion 43a extending inward.
The extended portion 43b is formed to project vertically below the openings 39 'and 41' of the crank chamber sub oil discharge passage 39 and the cam chamber oil discharge passage 41.

The baffle plate 42 is located above the oil pan gasket 43, and has two side portions 42b.
Protrudes over the extension 43b of the oil pan gasket 43.

Therefore, as shown in FIG. 1, the lubricating oil that has flowed down from the crank chamber main drainage passage 38, which has a particularly large amount of lubricating oil outflow, onto the baffle plate 42 and diverted to the left and right is further extended from the oil pan gasket 43. 43b, and after the momentum is sufficiently reduced, the oil pan 11
Is poured into.

Further, the lubricating oil that has flowed down from the crank chamber sub-drainage passage 39 and the cam chamber drainage passage 41 also falls onto the extended portion 43b of the oil pan gasket 43 to reduce its momentum before being poured into the oil pan 11. As a result, the lubricating oil flowing down from each of the oil drain passages 38, 39, 41 does not directly and vigorously flow into the oil pan 11. Therefore, there is no possibility that the lubricating oil O stored in the oil pan 11 foams and air bubbles are sucked into the oil pump 34, and a good lubricating state can be always maintained.

There is no cost increase by extending the inner peripheral portion 43a of the oil pan gasket 43 inward, and no additional parts are required. Therefore, the lubricating oil O in the oil pan 11 has a simple and inexpensive structure. Foaming can be reliably prevented.

[0034]

As described above, the oil pan baffle structure of the outboard motor according to the present invention mounts the engine on the engine holder with the crankshaft upright.
In an oil pan baffle structure of an outboard motor in which lubricating oil supplied to the inside of the engine flows down into an oil pan attached to a lower part of the engine holder through a drainage passage formed at the lowermost part of the engine, A baffle plate is mounted at a position on the flow path where oil lubricating the engine flows down into the oil pan, and an oil pan gasket is sandwiched between the engine holder and the oil pan below the baffle plate and below the baffle plate. The oil pan gasket is formed such that the oil pan gasket has an extended inner part extending at least partially overlapping the baffle plate in an oil pan cross-sectional plan view, and the baffle plate and the oil pan gasket Lubricating oil flowing down from the engine is applied sequentially In, is poured into the oil pan momentum from sufficiently weakened smoothly and smoothly while the lubricating oil flowing down from inside the engine flows down sequentially stepped a baffle plate and oil gaskets. Therefore, the lubricating oil stored in the oil pan is not foamed, and there is no possibility that the oil pump sucks air bubbles to deteriorate the lubrication state of the engine. Therefore, the lubrication performance of the engine can be improved, and the engine performance can be efficiently maintained over a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along a line II of FIG. 5, showing an embodiment of the present invention.

FIG. 2 is a right side view of the outboard motor including the oil pan baffle structure of the outboard motor according to the present invention.

FIG. 3 is a longitudinal sectional view of the engine.

FIG. 4 is a partially enlarged view of FIG. 3;

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is a plan view of an oil pan gasket.

[Explanation of symbols]

 2 Casing 3 Engine holder 5 Engine 11 Oil pan 19d Crank chamber 20c, 20d Cylinder 35 Oil hose 36 Strainer 38 Crank chamber main oil drain 39 Crank chamber auxiliary oil drain 41 Cam chamber oil drain 42 Baffle plate 43 Oil pan gasket 43a Inner peripheral part 43b Extension part O Lubricating oil

Claims (3)

(57) [Claims] 1. An engine mounted on an engine holder with a crankshaft upright, and lubricating oil supplied to the inside of the engine is attached to a lower portion of the engine holder via a drainage passage formed at a lowermost portion of the engine. In the oil pan baffle structure of the outboard motor that has flowed down into the pan, a baffle plate is attached to a position on the flow path where the oil lubricating the engine flows down into the oil pan below the engine holder, and An oil pan gasket provided between the engine holder and the oil pan at a lower portion, wherein an extension of the oil pan gasket having an inner peripheral portion extending inward is formed by extending the baffle plate in an oil pan cross-sectional plan view. And at least a part of the baffle plate is formed to overlap. Oil pan baffle structure for an outboard motor and the lubricating oil flowing down from the engine to the oil pan gasket, characterized in that the sequentially strikes. 2. The oil pan baffle structure for an outboard motor according to claim 1, wherein said baffle plate is arranged and mounted at a central portion of said oil pan in a plan view of an oil pan in a cross section in a horizontal plane. 3. The baffle plate is disposed and mounted substantially at the center of the oil pan in a cross-sectional plane view of the oil pan and substantially at the center of an open window formed inside an extended portion of the oil pan gasket. The oil pan baffle structure for an outboard motor according to claim 1.