JPH0715500U - Fishing net intrusion prevention device on marine propeller shaft - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent crevice corrosion of the chrome liner (sleeve) while reducing the outer diameter to ensure the prevention of fishing net intrusion. A structure in which a stern tube sealing device 5 is provided on a sleeve 2 that is fitted over a propeller shaft 1, and a stopper 14 that follows the movement of the sleeve 2 in the radial direction and has a substantially ring shape is provided. It is attached to the rearmost end of the stern tube sealing device 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fishing net intrusion prevention device for a marine propeller shaft.

[0002]

[Prior art]

 Conventionally, various techniques have been proposed as techniques for preventing fishing nets, ropes, etc. wound around a marine propeller from entering the stern tube sealing device. This conventional technique can be roughly classified into the following two types. Conventional Example 1 This is one in which a part having a stopper element is attached to a propeller (Shokai 62-166198, 62-171397, 62-177598, 62-68896, 53-53). 181555).

Conventional example 2 This is one in which a part having a stopper element is fixed on a chrome liner of a stern tube sealing device.

[0004]

[Problems to be solved by the device]

 The conventional example 1 has a problem that the outer diameter is large, the manufacturing cost is high, and screw holes are required on the propeller side. On the other hand, the conventional example 2 has a problem that crevice corrosion occurs in the chrome liner (sleeve) although the intrusion of the fishing net can be reliably prevented and the outer diameter can be reduced.

Therefore, an object of the present invention is to prevent the crevice corrosion of the chrome liner (sleeve) while reducing the outer diameter to ensure the prevention of intrusion of the fishing net.

[0006]

[Means for Solving the Problems]

 In the present invention, in which the stern tube sealing device 5 is provided on the sleeve 2 fitted over the propeller shaft 1, the following technical means are taken to achieve the above-mentioned object. That is, the present invention is characterized in that the stopper 14 which follows the movement of the sleeve 2 in the radial direction and has a substantially ring shape is attached to the rear end of the stern tube sealing device 5. is there.

[0007]

[Action]

 A stopper 14 prevents the rope, fishing net, etc. wound around the propeller from entering the sealing ring 11 of the stern tube sealing device 5. That is, since the stopper 14 follows the movement of the sleeve 2 in the radial direction, the clearance between the stopper 14 and the sleeve 2 is reduced to prevent the fishing net from entering.

Since the stopper 14 is provided not in the sleeve 2 but in the sealing device 5, it prevents crevice corrosion of the sleeve 2.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 showing the first embodiment, a chrome liner (sleeve) 2 is fitted onto a propeller shaft 1, and a flange 2A of the sleeve 2 has an O-ring 3 interposed between the propeller and the propeller. It is attached to the boss 1A with bolts 4.

A stern tube sealing device 5 is provided on the sleeve 2, and the sealing device 5 has the following configuration. That is, the flange ring 7 is fixed to the hull 6 with bolts 8, and the intermediate ring 9 is sequentially assembled to the flange ring 7 with the bolts 10. In this embodiment, three seal rings 11 are arranged side by side in the axial direction. A cover ring 12 divided into two is attached to the end with a bolt 13.

A mounting recess 12A having a T-shaped cross section is formed on the inner peripheral surface of the cover ring 12, and a stopper T having a T-shaped cross section made of an elastic material such as rubber or plastic is fitted into the mounting recess 12A. Have been combined. Since the cover ring 12 is divided into two parts, the stopper 14 is also divided into two parts and is substantially in the shape of a ring, and the inner peripheral surface of the stopper 14 is an uneven portion 14A and the outer periphery of the sleeve 2 is formed. Lightly touching the surface.

As shown in FIG. 2, the mounting recess 12 A and the stopper 14 are 0.5 to 1. There is a clearance e of 5 mm, and there are clearances a to d of 0.1 to 0.5 mm in the axial direction, and the stopper 14 smoothly follows the movement of the sleeve 2 in the radial direction, resulting in unevenness in the stopper 14. While keeping the contact clearance between the shaped portion 14A and the sleeve 2 small at all times, the fishing net is prevented from entering and the crevice corrosion of the sleeve 2 is prevented.

A semicircular recess 14 B is formed in the stopper 14 to improve the followability in the radial direction. 3 and 4 show a second embodiment of the present invention in which a stopper 14 having a substantially trapezoidal cross section is attached to an axial end surface of a cover ring 12 by a metal distance collar 15 and a bolt 16. Since the stopper 14 has the clearances a and b with respect to the collar 15, the stopper 14 follows the movement in the radial direction.

Since other configurations are common to those of the above-described first embodiment, common parts are indicated by common symbols.

[0015]

[Effect of device]

 As described above in detail, according to the present invention, the outer diameter size can be reduced, and the manufacturing cost can be reduced, while the following peculiar operational effects are exhibited. In other words, the stopper follows the movement of the sleeve in the radial direction, so that crevice corrosion of the sleeve can be surely prevented while surely preventing the intrusion of the fishing net, and the durability can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing an essential part of the first embodiment of the present invention.

FIG. 3 is a side sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing an essential part of a second embodiment of the present invention.

[Explanation of symbols]

 1 Propeller shaft 2 Sleeve 5 Stern tube sealing device 14 Stopper

Claims (1)

[Scope of utility model registration request] 1. A stern tube sealing device (5) on a sleeve (2) fitted on a propeller shaft (1), which follows radial movement of said sleeve (2) and A fishing net intrusion prevention device for a marine propeller shaft, wherein a stopper (14) having a substantially ring shape is attached to a rear end of the stern tube sealing device (5).