JPH072182A - Stern tube bearing - Google Patents

Abstract

PURPOSE:To demand no high machining precision, to prevent burning of a sleeve, etc., during insertion and removal, and to remove a residual stress generated in resin after curing. CONSTITUTION:By utilizing wedge engagement between taper surfaces 10 and 15 for fitting in between a sleeve 11 and a stern pipe bearing body 17, a fastening margin therebetween is regulatable according to a fit-in amount. By feeding liquid in liquid grooves 12 and 13 formed in the boundary surface between the sleeve 11 and the stern pipe bearing body 17, the boundary surface is lubricated and cooled. Further, by slightly increasing an amount of fitting of the stern pipe bearing body 17 in the sleeve 1 and expanding the sleeve 11, a residual stress exerted on resin 8 injected and cured between a bearing support hole 4 and the sleeve 11 is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stern tube bearing.

[0002]

2. Description of the Related Art As shown in FIG.
A propeller shaft 3 is rotatably supported via a stern tube bearing 2.

In a conventional stern tube bearing 2, as shown in FIGS. 5 and 6, a sleeve 6 having a cylindrical inner space 5 is fitted into a bearing support hole 4 formed in the rear portion of the hull 1, and A cylindrical stern tube bearing body 7 is tightly fitted in the internal space 5 of the sleeve 6 to connect the stern tube bearing body 7 and the sleeve 6 to the bearing support hole 4
After centering, the resin 8 is injected into the gap between the bearing support hole 4 and the sleeve 6 and cured.

The stern tube bearing body 7 is tightly fitted in the inner space 5 of the sleeve 6 so that the rotation of the propeller shaft 3 prevents slippage between the stern tube bearing body 7 and the sleeve 6. There is.

[0005]

However, the conventional stern tube bearing 2 has the following problems.

That is, in order to prevent slippage between the stern tube bearing body 7 and the sleeve 6 due to the rotation of the propeller shaft 3, the stern tube bearing body 7 is tightly fitted to the sleeve 6. Since the tightening margin between the stern tube bearing body 7 and the sleeve 6 must be set to a very small value on the order of 1/100 mm, high machining accuracy and measurement accuracy are required.

Further, since the stern tube bearing main body 7 is tightly fitted to the sleeve 6, there is a possibility that the sleeve 6 and the like may be burned when the both are inserted and removed.

Further, when the resin 8 injected into the gap between the bearing support hole 4 and the sleeve 6 is cured, residual stress is generated in the resin 8 due to shrinkage, but there is no means for removing the residual stress.

In view of the above situation, the present invention does not require high processing accuracy, prevents burning of the sleeve and the like during insertion / removal, and removes residual stress generated in the cured resin. It is intended to provide a stern tube bearing.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a sleeve which can be fitted in a bearing support hole formed in the rear portion of a hull and extends in the front-rear direction and has a tapered surface on the inner peripheral surface, and a taper of the sleeve on the outer peripheral surface. A stern tube bearing body having a tapered surface that can be wedge-fitted on its surface and an axial support portion that can rotatably support the propeller shaft on the inner peripheral surface, and a liquid for lubrication at the boundary between the sleeve and the stern tube bearing body. The present invention relates to a stern tube bearing, which is provided with a liquid groove capable of supplying the above.

[0011]

The operation of the present invention is as follows.

A sleeve is fitted in a bearing support hole formed in the rear portion of the hull, and the stern tube bearing body is fitted so that the tapered surfaces are wedge-fitted in the inner space of the sleeve.

As described above, since the wedge fitting by the tapered surface is used for fitting the sleeve and the stern tube bearing body, the tightening margin between the stern tube bearing body and the sleeve can be adjusted by the fitting amount of both. This makes it possible to eliminate the need for high processing accuracy and measurement accuracy.

Further, when the sleeve and the stern tube bearing body are fitted together, liquid is supplied to the liquid groove to lubricate and cool the boundary surface between the sleeve and the stern tube bearing body, so that when the both are inserted and removed,
Burnout of the sleeve and the like is prevented.

When the sleeve and the stern tube bearing body are fitted in this way, resin is injected into the gap between the bearing support hole and the sleeve and hardened.

When the resin injected into the gap between the bearing support hole and the sleeve is cured, the resin contracts and residual stress is generated in the cured resin. Is slightly increased and the sleeve is expanded in diameter, so that the resin is compressed, so that residual stress acting on the resin is removed.

[0017]

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

1 to 3 show an embodiment of the present invention.

In the figure, 1 is a hull, 3 is a propeller shaft, 4
Is a bearing support hole formed in the rear portion of the hull 1, and 8 is a resin injected into the bearing support hole 4.

A sleeve 1 which can be fitted in a bearing support hole 4 formed in the rear portion of the hull 1 and has a tapered surface 10 on the inner peripheral surface, the diameter of which is reduced as it goes forward and backward 9 of the hull 1.
1 is provided, a liquid groove 12 extending in the front-rear direction 9 and a liquid groove 13 branching from the liquid groove 12 in the circumferential direction are formed on the inner peripheral surface of the sleeve 11, and each of the above-mentioned components is provided at the rear portion of the sleeve 11. A liquid supply port 14 for supplying a liquid for lubricating and cooling such as lubricating oil to the liquid grooves 12 and 13 is formed.

Further, the taper surface 10 of the sleeve 11 is provided on the outer peripheral surface.
A stern tube bearing main body 17 having a tapered surface 15 capable of being wedge-fitted in and a shaft bearing surface 16 capable of rotatably supporting the propeller shaft 3 is provided on an inner peripheral surface thereof.

In FIG. 3, 18 is a fitting device for the sleeve 11 and the stern tube bearing main body 17, 19 is a jack support plate of the fitting device 18 fixed to the sleeve 11 via a post bolt 20, and 21 is a stern tube. A push plate that pushes the bearing body 17, 22 is a hydraulic jack interposed between the jack support plate 19 and the push plate 21, and 23 is a hydraulic jack through the liquid supply passage 24 and the branch liquid supply passage 25. A hydraulic pump for supplying the liquid to the liquid supply port 22 and the liquid supply port 14, and a valve 26 provided in the middle of the liquid supply flow path 24 and the branch liquid supply flow path 25.

Reference numeral 27 is a flange formed on the outer periphery of the rear portion of the sleeve 11.

Next, the operation will be described.

In the present invention, the sleeve 11 is fitted from the rear side into the bearing support hole 4 formed in the rear part of the hull 1, and the taper surfaces 10, 15 are inserted into the internal space of the sleeve 11 from the rear side.
The stern tube bearing body 17 is loosely fitted so that they are lightly wedge-fitted.

When the sleeve 11 and the stern tube bearing body 17 are loosely fitted in this way, the jack support plate 19 of the fitting device 18 is fixed to the sleeve 11 via the post bolts 20, and the push plate 21 is fixed to the stern tube bearing body 17. The hydraulic jack 22 is interposed between the jack support plate 19 and the pressing plate 21, and the hydraulic pump 23 supplies the liquid to the hydraulic jack 22 via the liquid supply passage 24. Sleeve 11
The stern tube bearing body 17 and the stern tube bearing body 17 are tightly fitted to each other so that rotation of the propeller shaft 3 does not cause slippage therebetween.

At this time, the sleeve 11 and the stern tube bearing body 1
Since the wedge fitting by the tapered surfaces 10 and 15 is used for fitting 7, the tightening margin between the stern tube bearing body 17 and the sleeve 11 can be adjusted by the fitting amount of both, and high processing accuracy can be achieved. And measurement accuracy are unnecessary.

Further, when the sleeve 11 and the stern tube bearing body 17 are fitted together, the liquid from the hydraulic pump 23 is supplied to the liquid grooves 12 and 13 through the branch liquid supply passage 25 and the liquid supply port 14. Since the boundary surface between the sleeve 11 and the stern tube bearing body 17 is lubricated and cooled, it is possible to prevent the sleeve 11 and the like from being burnt out when the both are inserted and removed.

In this way, when the sleeve 11 and the stern tube bearing body 17 are fitted, the sleeve 11 and the stern tube bearing body 17 are centered with respect to the bearing support holes 4 by a centering device (not shown). The resin 8 is injected into the gap with the sleeve 11 and hardened.

When the resin 8 injected into the gap between the bearing support hole 4 and the sleeve 11 is hardened, the resin 8 shrinks and residual stress is generated in the hardened resin 8. The resin 8 is compressed by slightly increasing the amount of fitting of the stern tube bearing body 17 into the sleeve 11 and expanding the diameter of the sleeve 11, so that the residual stress acting on the resin 8 is removed.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0032]

As described above, the stern tube bearing according to the present invention eliminates the need for high machining accuracy,
It is possible to obtain an excellent effect that it is possible to prevent the sleeve and the like from being burnt out at the time of insertion and removal, and to make it possible to remove the residual stress generated in the cured resin.

[Brief description of drawings]

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

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is an operational view showing how the stern tube bearing body is fitted into the sleeve.

FIG. 4 is a schematic side sectional view of a rear portion of a hull.

FIG. 5 is a side sectional view of a conventional example.

6 is a VI-VI arrow view of FIG.

[Explanation of symbols]

 1 Hull 3 Propeller shaft 4 Bearing support hole 9 Front-rear direction 10,15 Tapered surface 11 Sleeve 12,13 Liquid groove 16 Shaft bearing 17 Stern tube bearing body

Claims (1)

[Claims] 1. A sleeve which can be fitted in a bearing support hole formed in the rear portion of a hull and extends in the front-rear direction, and has a tapered surface on the inner peripheral surface, and a tapered surface which can be wedge-fitted on the tapered surface of the sleeve on the outer peripheral surface. And a stern tube bearing body having a shaft support portion capable of rotatably supporting a propeller shaft on its inner peripheral surface, and a liquid groove capable of supplying a lubricating liquid or the like to a boundary portion between the sleeve and the stern tube bearing body. A stern tube bearing characterized by having.