JPS6318753Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling water channel structure in an outboard motor, and more specifically, to a channel structure immediately before a water pump.

FIG. 2 is an enlarged view of the water pump section A of the outboard motor 1 in FIG. The waterway of this water pump section A consists of a waterway B just before the water pump formed by the gear case 2 and the under panel 3, and a waterway C just after the water pump formed inside the water pump case 4, and from the water intake 5 to The taken-in cooling water is sucked into the water pump 6 from the water passage hole 3a through the water passage B, and is force-fed by the pump from the water passage hole 6a through the water passage C to the engine and the like.

By the way, in such a conventional waterway structure, as shown in FIG. 2, an oil seal 8 is disposed between the gear case 2 and the drive shaft 7 to prevent leakage of cooling water. Therefore, in such a channel structure, foreign matter such as mud particles in the cooling water is deposited at the meeting point between the upper surface of the oil seal 8 and the circumferential surface of the drive shaft 7, thereby causing the drive shaft 7 at that location to There was a risk that the circumferential surface D would be worn out.

In view of these problems, the purpose of this invention is to
To provide a cooling water channel structure that does not cause wear on a drive shaft even when an outboard motor is used for a long period of time.

In order to achieve this object, the present invention prevents mud and sand particles from entering the circumferential surface of the drive shaft by forming a partition wall around the drive shaft.

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 3 shows the water channel structure of the pump section according to the present invention. The one shown in FIG. 3a has a water channel B in front of the water pump 6 formed by the gear case 2 and the under panel 3.
The peripheral edge of the gear case 2 on the drive shaft 7 side is made to protrude to form an annular wall there, and the upper end 1 of the annular wall
1a is brought into contact with the lower surface of the under panel 3.
In the waterway structure configured in this manner, mud and sand particles in the cooling water sucked into the pump 6 via the waterway B are prevented from entering the drive shaft 7 by the annular wall 11 of the gear case 2. In addition, gear case 2
Water entering the drive shaft 7 from the annular wall 11 and the under panel 3 is completely prevented by the oil seal 8 from entering below.
Furthermore, in the waterway structure of this embodiment, the annular wall 11 of the gear case 2 is connected to the under panel 3 of the water pump 6.
Since the under panel 3 is brought into contact with the under panel 3, it is effectively prevented from bending downward.

The waterway structure shown in FIG. 3b is such that the oil seal 8 of the embodiment shown in FIG. 3a is positioned in contact with the under panel 3, and the operation is almost the same as that of the embodiment shown in FIG. 3a.

In the waterway structure shown in FIG. 3c, a seal rubber 12 is provided in place of the annular wall 11 of the embodiment shown in FIG. The inner circumferential surface 12b thereof is brought into contact with the drive shaft 7, and the lower end outer circumferential edge 12c is fitted into the gear case 2. The waterway structure of this embodiment is almost the same as the operation of the embodiment shown in FIG. 3a.

The water channel structure shown in FIG. 3d is an embodiment of the embodiment shown in FIG. 3c using a specially shaped oil seal 13. This oil seal 13 is integrally constructed by fitting a seal rubber 13b into a metal ring 13a having a T-shaped cross section, overlapping a metal ring 13c having an L-shaped cross section, and fitting a seal rubber 13d there. While being loaded into the gear case 2, each lip is brought into contact with the lower surface of the under panel 3 and the drive shaft 7. The waterway structure of this embodiment is almost the same in operation as the embodiment of FIG. 3c.

In each of the above embodiments, the same elements as those shown in FIG. 2 are designated by the same reference numerals.

As mentioned above, the cooling water channel structure of the outboard motor according to the present invention completely isolates the drive shaft from the water channel, so foreign objects such as mud and sand particles in the cooling water can be removed between the drive shaft peripheral surface and the oil seal. There is no risk of infiltration of the drive shaft, and therefore the wear of the drive shaft due to this is eliminated, and the durability of the drive shaft can be improved.

[Brief explanation of the drawing]

Figure 1 is a side view of the outboard motor with the water pump section cut away, Figure 2 is an enlarged sectional view of the conventional water pump section, and Figures 3 a, b, c, and d.
1 is a sectional view showing a waterway structure according to the present invention. 1... Outboard motor, 2... Gear case, 3... Under panel, 4... Water pump case, 5...
Water intake, 6... Water pump, 7... Drive shaft, 8... Oil seal, 11... Annular wall, 12... Seal rubber, 13... Oil seal, A... Water pump section, B, C... ...waterways.

Claims (1)

[Scope of utility model registration request] In the cooling water channel structure of an outboard motor, the cooling water is taken into the gear case from the water intake port, is sucked by the water pump through the hole in the under panel around the drive shaft, and is sent from the water pump to the engine, etc. An outboard device characterized in that a partition wall surrounding the drive shaft is formed in the waterway formed by the gear case and the under panel, thereby preventing muddy sand particles and the like in the cooling water from entering the circumferential surface of the drive shaft. Cooling water channel structure in the machine.