JPH021453Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a cooling system for an outboard motor, in particular, an extension case that houses a drive shaft driven by the engine to drive a propeller shaft, is attached to the lower surface of the engine body, and the extension case is connected to the lower surface of the engine body. A water jacket for cooling the engine is recessed in the upper surface of the case, and a water pipe for supplying external water from a water pump is connected to the inner wall of the water jacket, and a drainage pipe opens into the extension case. To provide a cooling device having a simple structure and easy assembly by allowing the connection part of the water pipe and the drain port to be formed as cast on the upper surface of the extension case together with the water jacket. With the goal.

To achieve this objective, the present invention provides first and second first and second
A cutout was provided in the inner wall of the water jacket, and an elastic grommet attached to the outlet end of the water pipe was fitted into the first cutout, and an elastic stopper was fitted into the second cutout, leaving the drain port. It is characterized by

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, an outboard motor engine E is arranged so that the crankshaft 1 is vertical when in use, and the rotational torque of the crankshaft 1 is vertically arranged. The power is transmitted to a horizontally arranged propeller shaft 4 through a drive shaft 2 and a bevel gear transmission 3, and rotationally drives a propeller 5.

An oil pan 7 is bonded to the lower surface of the crankcase 6 that supports the crankshaft 1, and these constitute an engine body Ea. An extension case 8 accommodating the drive shaft 2 is fixed to the bottom surface of the oil pan 7 with bolts 10 overlapping with each other via a gasket 9. Furthermore, a bevel gear transmission 3 is mounted on the bottom surface of the extension case 8 in an oil-tight manner. A gear case 11 housed in is fastened with bolts 12. The extension case 8 is rotatably supported by a swivel case 14 via a bearing, and the swivel case 14 is connected via a horizontal pivot 16 to a stern bracket 15 which is clamped and attached to the hull S.

Exhaust inflow holes 17 and exhaust outflow holes 18 that open into the case 8 are formed in the rear walls of the upper and lower ends of the extension case 8, respectively.
An exhaust pipe 19 of the engine E is connected to the exhaust inflow hole 17 .

Inside the extension case 8, an exhaust guide plate 20 is disposed between the exhaust inflow hole 17 and the drive shaft 2. As clearly shown in FIG. 7, this exhaust guide plate 20 consists of a vertical guide part 20a and a mounting part 20b bent to one side from the top of the guide part 20a. It has positioning pieces 21, 21, 22 bent downward, respectively.
Further, the guiding portion 20a includes the left and right positioning pieces 21,
It is formed into a groove shape with a pair of side walls 23, 23 connected to each other, and the groove portion faces the exhaust gas inflow hole 17, as clearly shown in FIG.

The mounting portion 20b of the exhaust guide plate 20 is held between the extension case 8 and the oil pan 7 when the extension case 8 is polymerized and bonded to the oil pan 7. In order to position the mounting portion 20b, a pair of ribs 2 are provided on the upper end surface of the extension case 8, which engage with the outer surfaces of the left and right positioning pieces 21, 21 of the mounting portion 20b.
4, 24, and a rib 25 that engages with the inner surface of the positioning piece 22 at the rear end.

Further, on the upper end surface of the extension case 8, there is a partition wall 26 which is curved in a U-shape so as to surround the drive shaft 2 and connect between the pair of ribs 24, 24.
are provided protrudingly, and these ribs 24, 25 and partition wall 26
A water jacket 27 for cooling the oil pan 7 is recessed on the outside of the rib 25, and cooling grooves 40, 41 communicating with the water jacket 27 are provided before and after the rib 25.
is recessed. Moreover, a shallow first notch 28 and a deep second notch 29 are provided at one end and the other end of the curved partition wall 26, which face each other, respectively, to communicate the inside and outside. The ribs 24 and 25, the partition wall 26, the water jacket 27, and the notches 28 and 29 are formed when the extension case 8 is cast, and the partition wall 26
becomes the inner wall of the water jacket 27.

The first notch 28 has an extension case 8
An elastic grommet 31 attached to the upper end of the water pipe 30 running longitudinally therein is fitted into the second notch 29.
An elastic stopper 33 is fitted leaving a drain port 32 in the lower part thereof, and these grommet 31 and stopper 33 are pressed by the lower surface of the oil pan 7 and are connected to each notch 28, 29.
be prevented from leaving.

The lower end of the water pipe 30 is connected to a discharge port of a water pump 34 installed in the gear case 11 and driven by the drive shaft 2, and the water pump 34 sucks external water from a water intake hole 35 bored in the gear case 11. The water is then pumped to the water pipe 30.

An inlet of a water test hole 36 passing through the wall of the extension case 8 is opened at the bottom of the water jacket 27, and an outlet thereof is opened at the outer surface of the extension case 8 above the water line. In this case, as shown in the example, the outlet of the water test hole 36 is connected to the stern bracket 1.
If the opening is opened directly below the bearing 13 of No. 5, it is possible to prevent the drainage water from the water inspection hole 36 from wetting the upper part of the stern bracket 15 or from entering the inside of the ship.

In the figure, numeral 37 is a water seal for the upper rotating portion of the drive shaft 2, numeral 38 is a steering handle connected to the oil pan 7, and numeral 39 is an engine cover that covers the engine E.

Next, the operation of this embodiment will be explained.

While engine E is running, its exhaust gas flows into exhaust pipe 19.
When the exhaust gas is discharged into the extension case 8 through the exhaust inflow hole 17, the exhaust gas hits the groove-shaped guide portion 20a of the exhaust guide plate 20, and is guided downward while being cooled by the groove. Therefore, the drive shaft 2 and the water seal 37 are prevented from being directly exposed to the high temperature exhaust gas flowing in from the exhaust gas inlet 17. The exhaust gas diverted downward by the exhaust guide plate 20 is discharged into the water from the exhaust outlet 18.

On the other hand, the water sucked in from the water suction hole 35 by the operation of the water pump 34 and sent under pressure to the water pipe 30 is
As shown by the arrow in the figure, water is introduced into the water jacket 27 from the center of the grommet 31, and most of the water flows into the water jacket 27 along the curved partition wall 26.
7 and drain port 32 below plug body 33.
Water is drained from the water into the extension case 8.
During this time, the lubricating oil stored inside the oil pan 7 is cooled.

The water discharged into the extension case 8 scatters on the exhaust guide plate 20, the drive shaft 2, the inner surface of the extension case 8, etc., cools these and falls, and is discharged to the outside from the exhaust outlet hole 18 together with the exhaust gas. be done.

Further, a part of the water introduced into the water jacket 27 flows into the cooling grooves 40 and 41 and also cools the mounting portion 20b of the exhaust guide plate 20. Furthermore, the other part flows into the water inspection hole 36 and is discharged to the outside from the outlet of the water inspection hole 36, which opens above the waterline. You can check the status.

As described above, according to the present invention, the first and second notches whose openings are closed on the lower surface of the engine body are provided in the inner wall of the water jacket, and the first notch has an elastic grommet attached to the outlet end of the water pipe. In addition, since the elastic plug body was fitted into each of the second notches while leaving a drainage hole, the first and second notches can be formed as cast on the upper surface of the extension case together with the water jacket, and the first and second notches By fitting the elastic grommet and the plug into the engine body, the water pipe can be connected and the drain port can be formed immediately, and the elastic grommet and the plug are pressed against the lower surface of the engine body to prevent them from coming off from the respective notches. Therefore, a cooling device with a simple structure and easy assembly can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a vertical sectional side view of the entire outboard motor, Fig. 2 is an enlarged view of its main parts, Fig. 3 is a sectional view taken along the line - - in Fig. 2, Fourth
5 and 5 are cross-sectional views taken along lines - and - of FIG. 3, and FIG. 6 is an exploded perspective view of the area around the water jacket.
FIG. 7 is a perspective view of the exhaust guide plate. E...Engine, Ea...Engine body, 2...
... Drive shaft, 4 ... Propeller shaft, 8 ... Extension case, 26 ... Partition wall as inner wall of water jacket, 27 ... Water jacket, 28, 29
...First and second notches, 30... Water pipe, 31...
...Elastic grommet, 32...Drain port, 33...Elastic stopper, 34...Water pump.

Claims (1)

[Scope of utility model registration request] An extension case housing a drive shaft driven by the engine to drive the propeller shaft is attached to the lower surface of the engine body, and a water jacket for cooling the engine is recessed in the upper surface of the extension case. In a cooling device for an outboard motor, the cooling device for an outboard motor is provided with a water pipe for supplying external water from a water pump connected to the inner wall of the water jacket and a drain port opening into the extension case, wherein the opening is connected to the engine. First and second notches closed at the lower surface of the main body are provided in the inner wall of the water jacket, the first notch has an elastic grommet attached to the outlet end of the water pipe, and the second notch has the drain port. A cooling device for an outboard motor, characterized in that elastic plug bodies are fitted to each other.