JPH0653517B2 - Propeller protection device for ship propulsion - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller protection device for a marine propulsion device, and more particularly to a mounting structure for a protective member that protects a propeller such as an outboard motor or an outboard motor.

[Prior Art] Generally, in a marine propulsion device, for example, an outboard motor, a propeller is supported by a lower case as a drive unit, and a propeller is attached around a propeller for the purpose of protecting the propeller. Many.

Here, conventionally, there is one in which the propeller guard is supported by a cavitation plate that projects substantially horizontally from the outer wall of the lower case. However, since the cavitation plate has a thin plate structure, it cannot sufficiently support the load of the propeller guard and cannot sufficiently withstand the external force acting on the propeller guard.

Therefore, in the past, there is one in which a propeller guard is directly attached to the outer wall of the lower case so as to enclose the cavitation plate, but this makes the cavitation plate inevitably large in size as much as it protrudes from the lower case, which is appropriate. is not. Therefore, it is also considered to avoid the cavitation plate and support the propeller guard on the outer wall of the lower case at a position lower than the cavitation plate, but in this case, there is a possibility of interference with the propeller and the propeller guard The shape is therefore limited and thus also impractical.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make a propeller protection member, that is, a propeller guard, larger than necessary. It is an object of the present invention to provide a propeller protection device for a ship propulsion device that does not need to be provided and can support this protection member with sufficient strength.

[Means for Solving the Problems] In order to achieve this object, the present invention has a cavitation plate that projects substantially horizontally from a case body of a drive unit, and a propeller is supported by the case body below the cavitation plate. In a ship propulsion machine, the support member is fixed to the outer wall of the case body, and the support member is brought into contact with the upper surface of the cavitation plate, and at least the outer periphery of the propeller is surrounded by the protective member. It is abutted and bolted to the support member via the cavitation plate.

[Operation] With such a configuration, the protection member is supported by the case body via the cavitation plate and the support member, and the support structure thereof has sufficient strength. Further, since the upper part of the protection member is located on the lower surface of the cavitation plate, it does not adversely affect the running resistance of the ship during its construction because of its structure.

[Examples] The present invention will be described below based on Examples shown in the drawings. 1 to 4 show an embodiment in which the present invention is applied to an outboard motor.

First, in FIG. 1, reference numeral 10 is a cowling that encloses an engine, and the power of the engine is transmitted to a lower case 14 via an intermediate transmission shaft (not shown) supported by an upper case 12 below the cowling 10. Transmitted,
Here, it is transmitted to the propeller 16 supported by the lower case 14. Reference numeral 18 is a clamp bracket that carries this outboard motor and is attached to the stern plate of the ship. The lower case 14 is fixed to the upper case 12 by bolts 20 at the upper end, and at a position slightly lower than the upper end, as shown in FIGS.
A cavitation plate 22 is integrally and substantially horizontally formed from the outer wall of the cavitation plate 22. The cavitation plate 22 includes a lower case 14 that supports the propeller 16.
Projects further rearward than the lower part of the and extends to above the propeller 16. Further, as best shown in FIG. 4, the cavitation plate 22 is formed so that the shape of the upper end surface of the lower case 14 widens rearward.

A support member 24 is fixed to the upper outer wall of the lower case 14 on the upper surface of the cavitation plate 22. As shown in FIG. 3, the supporting member 24 is formed in a bifurcated yoke shape as a whole, and is mounted so as to sandwich the upper portion 15 from the rear end of the upper portion 15 of the lower case 14, and the supporting member 24 and the lower member 14 are attached. Upper part 15 of case 14
The support member 24 is firmly fixed to the outer wall of the upper portion 15 of the lower case 14 by the bolts 26 (two in this embodiment) penetrating through and the nuts 28 screwed into the bolts.
In FIG. 3, reference numeral 27 is a bolt hole through which the bolt 26 penetrates. A flange portion 30 is integrally formed on the lower portion of the support member 24, and the bottom surface of the flange portion 30 is in contact with the upper surface of the cavitation plate 22.

On the lower surface of the cavitation plate 22, the propeller 16
The upper portion of the propeller guard 32 is positioned as a protection member for protecting the vehicle, and is bolted to the support member 24 via the cavitation plate 22. As shown in FIG. 2, the propeller guard 32 is formed concentrically with the propeller 16 so as to surround the outer periphery of the propeller 16, and a plurality of holes 34 are formed along the circumferential direction at appropriate intervals. . More specifically, the upper portion of the propeller guard 32 is separated and the upper end surfaces of the propeller guards 32 are flat flange portions 36, which are brought into contact with the lower surface of the cavitation plate 22 at positions corresponding to the flange portions 30 of the support member 24. There is. Bolts 40 are screwed from below the flange portion 36 through plates 38, respectively.
The bolt 40 extends to the plate 38, the flange portion 36, the cavitation plate 22 and the flange portion 30 of the support member 24, thus substantially fixing the propeller guard 32 to the support member 24.

A bracket 42 is integrally formed in the lower portion of the propeller guard 32 in a yoke shape. The bracket 42 projects forward, that is, toward a skeg 44 provided at the lower end of the lower case 14, and holds the skeg 44. It is arranged to. Then, the bracket 4 is fixed by the bolt 46 and the nut 48 (two sets in this embodiment).
2 and the skeg 44 are firmly connected to each other.

It is needless to say that the propeller guard 32 does not have to be limited to a strip-shaped member having a plurality of holes 34 as in this embodiment, and may be, for example, a net-shaped member.

As described above, the upper portion of the propeller guard 32 is attached to the support member 24 via the cavitation plate 22 by the bolt 40.
While the support member 24 is fixed by the lower case 1
4 is fixed to the upper part 15 of the bolt 4 by the bolts 26, so that the propeller guard 32 is substantially fixed to the lower case 14, and its supporting structure is extremely strong. In this embodiment, a bracket 42 is provided below the propeller guard 32 and is fixed to the skeg 44 of the lower case 14 by the bolt 46 via the bracket 42. Therefore, the mounting structure of the propeller guard 32 is extremely strong. It has become a thing.

[Effect] As described above, according to the present invention, even though the protection member for protecting the propeller is positioned in contact with the lower surface of the cavitation plate, it is substantially supported by the lower case, that is, the case body of the drive unit. Therefore, its mounting strength is sufficiently high, and since the protective member is not arranged to include the cavitation plate, it is possible to design the shape with a high degree of freedom.
As a result, it may be shaped so as to reduce the running resistance of the ship.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of a propeller protection device for a marine propulsion device according to the present invention, particularly an example applied to an outboard motor, and FIG. 2 is an enlarged view of the propeller guard of FIG. Right side view, FIG. 3 is an enlarged plan view of the support member, FIG.
The figure is an exploded perspective view showing the mounting relationship between the lower case, the support member, and the propeller guard without the propeller. 14 ... Lower case 16 ... Propeller 22 ... Cavitation plate 24 ... Support member 32 ... Propeller guard

Claims (1)

[Claims] 1. A ship propulsion device in which a cavitation plate projects substantially horizontally from a case body of a drive unit, and a propeller is supported by the case body at a position lower than the cavitation plate, and a supporting member is fixed to an outer wall of the case body. The supporting member is brought into contact with the upper surface of the cavitation plate, at least the outer periphery of the propeller is surrounded by a protective member, the upper portion of the protective member is brought into contact with the lower surface of the cavitation plate, and is bolted to the supporting member via the cavitation plate. Propeller protection device.