JPS59100095A - Algae cutting apparatus for propeller for vessel propulsion machine - Google Patents

Abstract

PURPOSE:To certainly cut and remove the algae, fishing lines, etc., which twine around a propeller shaft, by means of a simple construction, by installing, at the front edge of a propeller blade part, cutting edge parts opposed to the outer peripheral surface and the edge surface of the rear edge part of a lower case. CONSTITUTION:Cutting edge parts 29A and 29B are installed onto the front edge part 28 of the blade part 20 of a propeller 16, and opposed to the outer peripheral surface 17A and the edge surface 17B of the rear-edge projection part 17 of a lower case 11, keeping a prescribed gap. The algae, fishing lines, etc., which twine onto the propeller 16 are transferred to a boss part 21 and guided into the gap between the outer peripheral surface 17A, the edge surface 17B, and the cutting edge parts 29A, 29B, and cut finely in a relatively wide cutting region, and twining is eliminated. Therefore, algae, etc., which twine onto the propeller can be certainly cut.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a propeller algae cutting device suitable for use in marine vessel propulsion devices such as outboard motors and inboard/outboard motors.

A marine propulsion device has a propeller attached to a propeller shaft that protrudes to the rear of a lower case that houses a propulsion unit.

Therefore, when algae, fishing line, etc. pass around the lower case, the algae, etc. are caught at a point on the leading edge of the propeller blade, and then run along the leading edge of the propeller blade to the boss of the propeller. Or it may become entangled with the propeller shaft. The moats etc. that are entangled around the propeller shaft in this way are
Contact with the rear end of the lower case may cause loss of rotational torque of the propeller shaft, damage the oil seal installed around the propeller shaft, or damage the oil seal installed around the propeller shaft at the rear end of the lower case. There is a risk that it will accumulate in the exhaust gas [] that is being used and block the exhaust port.

Therefore, conventionally, a seaweed cutting device has been installed on the leading edge of the propeller (11), which has a cutting blade integrally formed at the rear end of the lower case with a cutting blade section facing -4" across a predetermined gap. is proposed.

However, the above-mentioned conventionally proposed algae cutting device,
The cutting edge is arranged to face the inner circumferential surface of the rear end of the lower case, and the cutting edge only forms a relatively narrow cutting area between the cutting edge and the lower case. It is difficult to reliably cut the gravel etc. that have been found.

SUMMARY OF THE INVENTION An object of the present invention is to provide a propeller cutting device for a marine vessel propulsion device that can reliably cut to 10% of algae, fishing line, etc. entangled around the propeller shaft with a simple structure.

In order to achieve the above object, the algae cutting device for a propeller for a marine propulsion device according to the present invention has a cutting blade integrally formed on the leading edge of the blade of the propeller on at least the outer circumferential surface and end surface of the rear end of the lower case. They are arranged facing each other.

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

FIG. 1 is a cross-sectional view showing a propeller attachment part of an outboard motor to which a seaweed cutting device according to a first embodiment of the present invention is applied, and FIG. 2 is an enlarged view showing the main parts of FIG. 1. .

A propulsion unit (not shown) is built into the lower case 11 of the outboard motor, and a propeller shaft 14 is supported by a bearing housing 12 provided in the lower case 11 via a bearing 13 . The propeller +11114 passes through an oil seal 15 installed between the bearing housing 12 and extends L toward the rear of the lower case 11, and a propeller 16 is fixed to the extended portion.

Further, at the rear end of the lower case 11, there is a substantially annular rear end protrusion 1γ that is coaxial with the propeller shaft 14 and protrudes rearward.
is integrally molded. Between the rear end protrusion 17 of the lower case 11 and the bearing housing 12, the lower case 1
1 (exhaust connected to engine exhaust expansion south 18) 119
is formed.

The propeller 16 includes a plurality of wing parts 2o, etc., a boss part 21 integrally formed with the wing parts 2o, an inner cylinder 22 attached to the extending part of the propeller shaft 14, and a boss part 21 and an inner cylinder 22. and a damper member 23 interposed between the boss portion 2 and the damper member 23.
The inner cylinder 22 and the damper member 23 are joined by baking, and are assembled to the propeller shaft 14 as an assembly.

The propeller 1G includes a collar 24 positioned on the tapered shoulder portion 14A of the propeller shaft 14, and a propeller shaft 1.
It is assembled onto the propeller shaft 14 while being held between a collar 26 which is supported on the back by a nut 25 screwed onto the rear end of the propeller shaft 14.

Here, in the boss part 21, an outer boss part 21A and an inner boss part 21B which are arranged concentrically with each other are integrated by a lip 21C, and the outer boss part 21A and the inner boss part 21B are equally spaced in the circumferential direction. Exhaust passages 27 axially pass through the respective parts.
is formed. That is, the engine exhaust gas can be discharged rearward from the exhaust passage 2γ of the boss portion 21 after passing through the expansion chamber 18 formed in the lower case 11 and the exhaust gas [119].

Note that the front end of the outer boss portion 21A is loosely fitted into the inner peripheral portion of the rear end protrusion 17 of the lower case 11.

Therefore, in this propeller 16, the portion 28A of the leading edge portion 28 of each wing portion 20 that continues to the outer boss portion 21A is
Lower case 11 from the conventional state shown by the two-dot chain line in Figure 1.
The front edge 28A of the lower case 1 is formed to protrude on the side.
The outer peripheral surface 1 of the rear end protrusion 17 is integrally molded with the rear end protrusion 17.
Cutting blade portions 29A and 29B are integrally formed at portions facing the end face 7A and the end face 17B through a narrow gap, respectively.

Next, the operation of the first embodiment will be explained.

When algae, fishing line, etc. pass around the lower case 11 and are caught by the front edge 28 of the propeller 16, the algae, etc. move toward the boss portion 21 along the front edges 28, 28A. The outer peripheral surface 17A of the rear end protrusion 17 of the lower case 11 and the end surface 17 of the rear end protrusion 17 of the cutting edge 29A1.
It is guided into the narrow gap between the cutting edge B and the cutting edge m29B, and is entangled with the outer circumferential surface 17A1 of the end surface 17B. In this way, the outer circumferential surface 17A1 of the rear end protrusion 17
Algae etc. attached to the end surface 17B are removed from the outer peripheral surface 11A and the end surface 17.
Each wing portion 20 rotates while forming a wide cutting area with respect to B.
are finely cut by the cutting blades 29A and 29B,
It will help you get rid of that hold-up.

Therefore, according to the first embodiment, the lower case 11
The cutting blades 29A, 29B and the lower case 1 can be easily connected to each other without providing separate parts to the rear end and the leading edge of the blade of the propeller 16.
It becomes possible to form a relatively wide cutting area between the rear end protruding part 17 of 1, and it becomes possible to reliably cut algae and the like in the wide cutting area.

FIG. 3 is a cross-sectional view showing a propeller attachment part of an outboard motor to which a seaweed cutting device according to a second embodiment of the present invention is applied, and FIG. 2 is an enlarged view showing the main parts of FIG. 1. .

In this second embodiment, the same parts as those in the first embodiment are given the same reference numerals, and a description thereof will be omitted. This second embodiment differs from the first embodiment in the following points. That is, the propeller 31 is attached to the propeller shaft 14 that extends rearward of the lower case 11.

The propeller 31 includes a plurality of wing parts 32, a boss part 33 integrally formed with the wing parts 32, an inner cylinder 34 attached to an extending part of the propeller shaft 14, and a structure between the boss part 33 and the inner cylinder 34. A dowel member 35 is interposed therebetween. That is, in this second embodiment, no busy exhaust passage is formed in the boss portion 33 of the propeller 31, and engine exhaust gas can be directly discharged to the outside from the exhaust port 19 of the lower case 11.

Therefore, in this propeller 31, the portion 36A of the leading edge portion 36 of each wing portion 32 that continues to the boss portion 33 is
The part 36A is formed to protrude toward the lower case 11 side from the conventional state shown by the two-dot chain line in Figure iC, and faces the outer circumferential surface 17A1 end surface 1γ■3 of the rear end protrusion 17 integrally molded with the lower case 11 through a narrow gap. 1 cutting edge portions 3γA and 37B are formed at the portion where the cutting edge is formed.

According to the second embodiment, as in the first embodiment, algae etc. caught on the leading edge 36 of the propeller 31 move toward the boss 33 along the leading edges 36 and 36A. The outer circumferential surface 17A of the rear end protrusion 17 and the cutting edge 37A
, the outer circumferential surface 11A1 of the rear end protrusion 17 is guided by the narrow gap between the end surface 17B of the rear end protrusion 1γ and the cutting edge 37B.
However, it becomes entangled in a state where it adheres to 17B. The algae etc. that have adhered to the rear end protrusion 17 in this way are cut into small pieces by the cutting blades 37A and 37B of the rotating wing parts 32 forming a wide cutting area with respect to the outer circumferential surface 17AX and the end surface 17B. You can get rid of that entanglement.

Note that, as shown in FIG. 4, the leading edge portion 36A of each wing portion 32
, a cutting edge portion 3 facing the inner circumferential surface 1γC of the rear end protrusion 1T.
If 7C is integrally molded, the cutting area will be wider and algae etc. can be cut more reliably.

Note that each of the above embodiments is based on the rear end protrusion 1 of the lower case 11.
The case where the present invention is applied to a marine propulsion device having an exhaust port 19 inside the lower case 11 has been described. It is also applicable to a ship propulsion device.

As described above, in the algae cutting device for a propeller for a marine propulsion device according to the present invention, the cutting blade portion integrally formed on the leading edge of the propeller blade is arranged to face at least the outer circumferential surface and the end surface of the rear end of the lower case. This is how it was done. Therefore, it is possible to form a relatively wide cutting area by the cutting blade between the cutting blade and the rear end of the lower case without providing separate parts for the rear end of the lower case and the leading edge of the propeller blade. This makes it possible to reliably cut algae, etc. in the wide cutting area.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the propeller mounting part of an outboard motor to which a seaweed cutting device according to the first embodiment of the present invention is applied, FIG. 2 is an enlarged view showing the main parts of FIG. 1, and FIG. FIG. 3 is a sectional view showing a propeller receiving part of an outboard motor to which a seaweed cutting device according to a second embodiment of the present invention is applied, and FIG. 4 is an enlarged view showing the main parts of FIG. 3. . 11... Lower case, 14... Propeller 'AIJ,
16. 31... Propeller, 17... Rear end protrusion, 17A.
...Outer peripheral surface, 1TN3... End face, 20.32... Wing part, 28° 28A, 36, 36A-... Leading edge part,
29A, 29L3, 37A. 37B... Cutting Blade Department Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A propeller for a marine propulsion device, which has a cutting edge that faces the rear end of the lower case with a predetermined gap formed integrally with the leading edge of the blade of the propeller attached to the propeller shaft extending rearward of the lower case. In the algae cutting device for a propeller for a marine vessel propulsion device, the cutting blade portion is arranged to face at least an outer circumferential surface and an end surface of a rear end portion of the lower case.