JPH042876Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to an outboard motor.
The present invention relates to an outboard motor configured to supply a portion of cooling water flowing through a cooling water passage to an air seal waterway surrounding a drive shaft through a water seal hole formed in a water pump casing.

FIG. 1 shows a conventional outboard motor, and FIG. 2 shows an enlarged view of its main parts (the part indicated by arrow A in FIG. 1).

This outboard motor has driveshaft housing 1
The cooling water passage 1a and the air seal water passage 3 surround the drive shaft 2. They are connected to each other.

A portion of the cooling water taken in from the water intake port 5 by the water pump 4 and flowing through the cooling water passage 1a is supplied to the air seal waterway 3 via the water seal hole 4b.

By the way, the water quality of the water supplied as cooling water naturally varies depending on the region where the outboard motor is used, and often contains many foreign substances such as pebbles and floating objects.

Under such usage conditions, if the diameter of the water seal hole 4b is small, the hole 4b will become clogged with foreign matter in the cooling water, resulting in a stagnation in water supply to the air seal waterway 3 and greatly reducing the performance of the outboard motor. It's inconvenient.

Therefore, in the past, the diameter of the water seal hole 4b was appropriately set according to the water quality in the area where the outboard motor was used, and the drilling process of the water seal hole 4b was performed based on this set value. It was being implemented.

However, the casing 4a of the water pump 4
are generally made of stainless steel, resin, etc., making it difficult to machine small-diameter holes, and burrs are likely to form, requiring deburring work.As a result, water seal holes 4b The drilling process for the outboard motor is extremely complicated, which has the disadvantage of increasing the production cost of the outboard motor.

On the other hand, the water seal hole 4b is formed by drilling from the center side of the casing 4a, that is, from the air seal waterway 3 side, so as not to make unnecessary holes in the casing 4a of the water pump 4. It is formed by inserting a tool such as the water seal hole 4b.
As is clear from FIG. 2, the cooling water passage 1a
It is formed at an angle with respect to the flow direction of the cooling water inside.

If the water seal hole is inclined, the opening of the water seal hole appearing on the wall defining the cooling water passage 1a will have an elliptical shape. Also, the opening area becomes large, and foreign matter in the cooling water is easily sucked in, leading to clogging of the water sealing hole.

Therefore, in the outboard motor shown in FIG. 2, the wall surface of the portion where the water seal hole opens is inclined, and the opening is approximately circular. However, since the opening of the water seal hole 4a faces diagonally downward, Although cooling water can be taken in efficiently, pebbles and the like in the cooling water tend to get caught on the edges of the opening, resulting in the inconvenience of clogging the water sealing hole.

In view of the above-mentioned circumstances, an object of the present invention is to provide an outboard motor that can prevent an increase in production costs and also prevent clogging of water seal holes due to foreign objects in the cooling water. do.

Therefore, in the present invention, an inclined hole is formed in the casing of the water pump, and the inclined hole extends at an angle with respect to the flow direction of the cooling water in the cooling water passage, and communicates the cooling water passage and the air seal waterway with each other. The above object was achieved by fitting into the hole a pipe whose end on the side of the cooling water passage was bent so that the opening surface of the end was parallel to the flow of the cooling water.

Hereinafter, the outboard motor related to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows an enlarged view of a main part of an embodiment of an outboard motor according to the present invention. In FIG. 3, the same elements as those shown in FIG. 2 are given the same reference numerals.

In the above outboard motor, the casing 4a of the water pump 4 has an air seal waterway 3 defined by an annular boss projecting from the upper part of the casing 4a.
An inclined hole 10 is formed which communicates the cooling water passage 1a with the cooling water passage 1a extending in the vertical direction in the figure.

As is clear from the figure, this inclined hole 10 is
It is formed to be inclined with respect to the flow direction of the cooling water in the cooling water passage 1a (vertical direction in the figure).

A pipe 1 made of resin or the like is provided in the inclined hole 10.
1 is fitted into the hole 11a of the pipe 11.
constitutes a water seal hole 11a corresponding to the water seal hole 4b in FIG.

As clearly shown in FIG. 2, the pipe 11 is fitted into the inclined hole 10 with its end 11b on the side of the cooling water passage 1a protruding into the cooling water passage 1a. The end portion 11b is arranged so that the opening surface 11c of the end portion 11b is parallel to the flow direction of the cooling water in the cooling water passage 1a.
is formed by bending.

In the outboard motor with the above configuration, a plurality of pipes with different inner diameters are prepared, a pipe with an inner diameter that matches the water quality of the area where the outboard motor is used is selected, and the pipe 11 is inserted into the inclined hole 10. Fit it in.

As a result, as in the past, the water sealing holes 4b can be made with different diameters to match the water quality of each region.
This eliminates the need for processing.

Furthermore, in order to provide the inclined hole 10 into which the pipe 11 is fitted, it is sufficient to form a through hole with a relatively large diameter. It can be easily implemented.

Furthermore, since the end 11b of the pipe 11 on the cooling water channel 1a side is bent and the opening surface 11c is positioned parallel to the flow direction of the cooling water, the end 11b of the pipe 11 is bent. Pebbles in the cooling water are less likely to get caught on the edge of the opening.

As explained above, according to the outboard motor according to the present invention, a pipe is fitted into the inclined hole that communicates the cooling water passage and the air seal waterway, and the water seal hole is formed by the hole of the pipe. Because it is configured like this,
It is easy to form a hole for water sealing, and an increase in production costs can be prevented.

Further, in the outboard motor according to the present invention, the end of the pipe on the cooling water passage side is bent, and the opening surface of the end is parallel to the flow direction of the cooling water flowing through the cooling water passage. This structure makes it difficult for pebbles in the cooling water to get caught on the edge of the opening, making it possible to prevent the water sealing hole from being clogged by foreign objects in the cooling water.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of a conventional outboard motor.
FIG. 2 is an enlarged cross-sectional view of the main parts of the outboard motor, and FIG. 3 is an enlarged cross-sectional view of the main parts of the outboard motor according to the present invention. 1a... Cooling water passage, 2... Drive shaft, 3... Air seal waterway, 4... Water pump, 4a... Casing, 10... Inclined hole, 11
...Pipe, 11a...Water seal hole, 11b...
... End, 11c... Opening surface.

Claims (1)

[Claim for Utility Model Registration] An outboard device configured to supply a portion of the cooling water flowing through the cooling water passage to an air seal waterway surrounding a drive shaft through a water seal hole provided in a water pump casing. In the water pump, an air seal waterway defined by an annular boss protruding from the upper part of the casing of the water pump, and a flow of cooling water extending between the air seal waterway and the cooling water passage and within the cooling water passage. an inclined hole formed in the casing of the water pump in a manner inclined with respect to the direction; a pipe whose end on the water passage side is bent such that the opening surface of the end is parallel to the flow direction of the cooling water in the cooling water passage; An outboard motor characterized by having a water seal hole in the casing.