JP2939265B2 - Outboard motor lubrication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating device for an outboard motor, and in particular, lubricates a lubricating oil from a lubricating oil tank by an oil pump and introduces the lubricating oil to a predetermined engine location. The present invention relates to a structure of an oil supply passage.

[Prior Art] In general, an outboard motor is operated by a tilt-up operation. Therefore, the vertical positional relationship between the lubricating oil tank and the oil pump during normal operation fluctuates during the tilt-up operation. The oil in the oil supply passage during this time may be replaced with air, and when this outboard motor is returned to a substantially upright normal posture and started, the lubricating oil may be insufficient, and There is a problem that can cause engine damage.

Therefore, conventionally, as shown in FIG. 3 (A), a loop 16 extending in the vertical direction is provided in the middle of the oil supply passage 14 between the lubricating oil tank 10 and the oil pump 12. Thus, even if the oil pump 12 is tilted up as shown in FIG. 3B and the oil pump 12 is positioned above the lubricating oil tank 10, the lubricating oil 18 in the oil supply passage 14 is The presence of the rising portion prevents the lubricating oil 18 between the loop 16 and the oil pump 12 from being completely replaced with air, and has the effect of preventing shortage of lubricating oil at the time of restart.

[Problems to be solved by the invention] However, the outboard motor not only performs the tilt-up operation,
Sometimes removed from the hull and placed directly on the floor. in this case,
There is a method of placing the same position as that at the time of the tilt-up operation. The relationship between the lubricating oil tank 10 and the oil pump 12 in that case is shown in FIG. 3 (C). In this case, the oil supply passage 14
The loop 16 is in a state where the upright portion in the vertical direction is eliminated, so that the lubricating oil 18 in the oil supply passage 14 is naturally replaced with air, and when the outboard motor is mounted on the hull again and started and operated, The problem of engine seizure and the like due to insufficient lubricating oil still remains.

The present invention has been made in view of such problems of the related art, and its purpose is not only when the outboard motor is tilted up, but also when the outboard motor is removed from the hull and directly placed on a floor or the like. Even in such a case, it is an object of the present invention to provide a lubricating device for an outboard motor in which lubricating oil in an oil supply passage between a lubricating oil tank and a predetermined point for supplying lubricating oil is prevented from being completely replaced with air. .

Means for Solving the Problems In order to achieve the above object, the present invention is configured to supply a lubricating oil from a lubricating oil tank via an oil supply passage provided with an oil pump, and to provide a tilt shaft. In a lubricating device for an outboard motor rotatable around up and down, a loop having an axis inclined with respect to a tilt axis is provided in an oil supply passage.

In another aspect of the present invention, in the above case, at least two loops having axes in directions different from each other are provided in the oil supply passage.

[Operation] As described above, by providing a loop having an axis inclined with respect to the tilt axis and at least two loops extending in different directions in the middle of the oil supply passage, the outboard motor can be substantially in any state. Even if the position is changed, a loop having the inclined axis and at least two loops always have an upward rising portion, so that it is possible to prevent the lubricating oil in the oil supply passage from being completely replaced with air. .

EXAMPLES The present invention will be described below based on examples shown in the drawings.

First, FIG. 1 shows an overall schematic diagram of an embodiment of an outboard motor lubrication apparatus according to the present invention. The engine 20 of the outboard motor is mounted on an upper part of a casing 22, and the casing 22 is attached to a stern plate 28 of the hull via a swivel bracket 24 and a clamp bracket 26, and in particular, the swivel bracket 24 is Since the casing 22 of the outboard motor is supported so as to be rotatable up and down via 30, a tilt-up operation can be performed as shown by a virtual line in the figure.

As before, the lubricating oil is sucked from the lubricating oil tank 10 via the oil supply passage 14 to the oil pump 12 disposed behind the lubricating oil tank 10 in this embodiment. The oil is supplied to the downstream side of the oil supply passage 32 via oil supply passages 34. 36 is an intake silencer and 38 is a flywheel magneto.

As shown in detail in FIG. 2, in this embodiment, first, a loop 16 extending in the vertical direction is provided in the oil supply passage 14 between the lubricating oil tank 10 and the oil pump 12 as in the conventional example. In addition, a loop 40 extending in the horizontal direction is further provided. Further, in this embodiment, each oil supply passage 34 between the oil pump 12 and the intake passage 42 downstream of each carburetor 32 is provided.
In addition, a loop 44 extending in the vertical direction and a loop 46 extending in the horizontal direction are provided. Reference numeral 48 denotes a throttle provided at a discharge port of the oil supply passage 34 with respect to the air passage 42, and especially when the outboard motor is tilted up or removed from the hull and directly placed, the lubrication inside the oil supply passage 34 is particularly improved. This is for preventing the oil from flowing into the intake passage 42 and being replaced with the air. The throttle 48 is effective particularly when the loops 44 and 46 are not provided in the oil supply passage 34. 50 is a float chamber, and 52 is a throttle valve.

Next, based on FIGS. 4 (A), (B) and (C) corresponding to the conventional FIGS. 3 (A), (B) and (C), the oil supply passage 14 in the above embodiment is provided. The operation of the two loops will be described. Although two loops are provided in the oil supply passage 34 in FIG. 2, the operation of these two loops is the same.

When the outboard motor is tilted up as shown in FIG. 4 (B) from the state of the normal operation shown in FIG. 4 (A), the oil pump 12 is located above the lubricating oil tank 10 so that the oil The lubricating oil 18 in the supply passage 14 tries to be replaced with air, but not only the loop 16 but also the loop 40
Exists, an upward rising portion is formed in each loop, and it is prevented that the lubricating oil 18 in the oil supply passage 14 is completely replaced with air. In this case, there is substantially no difference in the operation and effect from the conventional example shown in FIG. 3 (B).

When the outboard motor is detached from the hull and placed sideways as shown in FIG. 4 (C), the loop 16 is placed sideways so that there is no upward standing part, This time, the loop 40 extending in the vertical direction now extends in the vertical direction, and the presence of the rising portion above it prevents the lubricating oil 18 in the oil supply passage 14 from being completely replaced with air. .

As described above, in the normal operation, the loop extending in the vertical direction and the loop extending in the horizontal direction are connected to the oil supply passage.
By providing the outboard motor in the middle of 14 and / or 34, when the outboard motor is positioned in substantially all directions, at least one of the loops will have an upward rising portion, whereby the oil supply It is possible to prevent the lubricating oil 18 in the passage 14 from completely replacing the air.

In this embodiment, as shown in FIG.
34 is also provided with two loops 44 and 46 having different extending directions, similar to the case of the oil supply passage 14, but the present invention extends substantially in the middle of the passage composed of the oil supply passages 14 and 34. A desired effect can be achieved by providing at least two loops having different directions.

In the above embodiment, one of the two loops extends in the vertical direction during normal operation, and the other extends in the horizontal direction. However, the present invention is not limited to this. It may be in a state inclined from the direction, and at least the extending directions may be different from each other. In the above embodiment, two loops of the oil supply passage 14 and two loops of the oil supply passage 34 are provided. However, three or more loops may be provided. At least two loops extending in different directions may be provided in the middle of the lubricating oil supply passage to the oil supply target position.

Next, a structure for providing two loops having different extending directions in the middle of the oil supply passage 14 will be specifically described with reference to FIGS.

In the example shown in FIG. 5, when the oil supply passage 14 is formed of a flexible rubber hose or the like, the loops 16 and 40 are fixed to the adjacent fixed wall surfaces by the fixing bracket 60, and the loop shape is maintained. It is.

In the example shown in FIG. 6, the portion of the oil supply passage 14 where the loops 16 and 40 are to be formed is formed by, for example, a plastic pipe 62 made of a material capable of maintaining its own shape. Are made of a flexible material and are connected to each other.

The example of FIG. 7 shows a loop 16 extending substantially vertically.
And a box 64 defining a loop 40 extending in the horizontal direction in communication therewith as a passage, is interposed between the oil supply passages 14.

8 (A) and 8 (B) show another embodiment of the present invention, wherein FIG. 8 (A) is FIG. 4 (B) and FIG. 8 (B) is FIG. FIG. 4 is a diagram corresponding to FIG. In this embodiment, a loop 68 having an axis 66 inclined with respect to the tilt axis 30, that is, a loop extending in a plane parallel or not perpendicular to the plane including the tilt axis 30 is provided in the middle of the oil supply passage 14. . This loop 68 is not only in the state where the outboard motor is tilted up as shown in FIG.
As shown in FIG. 7B, even when the outboard motor is placed sideways, the outboard motor has an upward rising portion, so that the oil in the oil supply passage can be prevented from being completely replaced with air.

[Effects] As described above, according to the present invention, not only when the outboard motor is tilted up, but also when it is detached from the hull and placed directly on the floor in any posture, the oil in the oil supply passage is Can be prevented from being completely replaced with air, which prevents the engine from seizing due to lack of lubricating oil when restarting the outboard motor. is there.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an overall configuration of an embodiment of an outboard motor lubrication apparatus according to the present invention, FIG. 2 is a side view showing an enlarged main part of the embodiment, and FIG. , (B), (C) are schematic diagrams showing the operation of the conventional example, and FIGS. 4 (A), (B),
(C) is a schematic view for explaining the operation of the embodiment of the present invention corresponding to FIG. 3, FIG. 5 is a perspective view showing one embodiment of a structure for forming a loop of the present invention, and FIG. FIG. 7 is a perspective view showing another example, FIG. 7 is a perspective view showing still another example, and FIGS. 8 (A) and (B) are schematic views for explaining the operation of another embodiment of the present invention. 10 Lubricating oil tank 12 Oil pump 14 Oil supply passage 16, 40, 44, 46 Loop 18 Lubricating oil 34 Oil supply passage

Claims (2)

(57) [Claims] 1. A lubricating oil device for an outboard motor, wherein lubricating oil is supplied from a lubricating oil tank via an oil supply passage provided with an oil pump, and is rotatable up and down around a tilt axis. A lubricating device for an outboard motor in which a loop having an axis inclined with respect to a tilt axis is provided in the oil supply passage. 2. A lubricating device for an outboard motor for supplying lubricating oil from a lubricating oil tank via an oil supply passage provided with an oil pump, wherein at least one shaft having a different direction is provided in the oil supply passage. Outboard motor lubrication system with two loops.