JPH0336477Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bearing device for an inner shaft in a counter-rotating propeller device suitable for use in ships.

(Prior Art) In a counter-rotating propeller device, one of two propellers is driven to rotate in opposite directions by an outer shaft and the other by an inner shaft passing through the outer shaft.

(Problem to be solved by the invention) In the counter-rotating propeller device mentioned above, when the outer shaft and inner shaft become long, the bearing device disposed in the gap between the outer shaft and the inner shaft It is necessary to support the shaft.

All conventional bearing devices of this type have the problem that they are difficult to assemble and disassemble, requiring not only skill but also a great deal of time and effort.

(Means for solving the problem) The present invention has been proposed to deal with the above problem, and its gist is that an outer shaft and an inner shaft passing through the outer shaft are arranged in opposite directions. In a contra-rotating propeller device having two propellers that are rotationally driven, a notch is formed inside the open end of the outer shaft, and a floating bush is formed between the inner circumferential surface of the outer shaft and the outer circumferential surface of the inner shaft. Insert into the gap from the open side, fit the collar provided on the outer peripheral surface of the open end of the floating bush into the notch, and attach the presser metal fitting removably fixed to the open end of the outer shaft. A bearing device for an inner shaft in a counter-rotating propeller device, characterized in that the bearing device is opposed to the open end of a floating bush.

(Embodiment) A first embodiment of the present invention is shown in FIGS. 1 to 3.

In Fig. 1, 1 is an inner shaft passing through the outer shaft 2,
A stern propeller 11 is attached to its tip. A bow propeller 12 is attached to the tip of the outer shaft 2. The stern propeller 11 and the bow propeller 12 are driven to rotate in opposite directions via an inner shaft 1 and an outer shaft 2 by a drive mechanism (not shown). Reference numeral 13 denotes a stern portion of the hull, and within the gap between the inner circumferential surface of a cavity 13a provided therein and the outer circumferential surface of the outer shaft 2, a stern-side fixing bush 9 is mounted on the stern side, and a bow-side fixing bush 10 is mounted on the bow side. are arranged respectively. A stern bearing device 4 for pivotally supporting the inner shaft 1 on the stern side within the gap between the inner circumferential surface of the outer shaft 2 and the outer circumferential surface of the inner shaft 1 is provided on the bow side.
are arranged respectively. 14 is the rear bulkhead of the engine room, 15 and 16 are the stern side sealing devices, 17 and 1
8 is a bow side sealing device. Stern bearing device 4
The details are shown in FIG. 2, and a notch 2a is provided on the inner circumferential surface of the open end of the outer shaft 2. A floating bushing 6 made of steel or the like is inserted from the open side into the gap between the inner circumferential surface of the outer shaft 2 and the outer circumferential surface of the inner shaft 1. The collar 6a is fitted into the notch 2a. Next, a flange ring 15a of the stern side sealing device 15, which also serves as a push fitting made of copper alloy or the like, is fastened to the open end of the outer shaft 2 with bolts 15c, so as to face the open end of the floating bush 6. 1
5b is a seal liner of the stern side sealing device 15;
6b and 6c are white metals pasted on the inner and outer peripheral surfaces of the floating bush 6.

FIG. 3 shows details of the bow side bearing device 3. Similar to the stern side bearing device 4, a notch 2b is provided on the inner peripheral surface of the open end of the outer shaft 2, and the inner peripheral surface of the outer shaft 2 and the inner shaft By inserting the floating bush 5 from the open side into the gap between the floating bush 5 and the outer peripheral surface of the
A collar 5a provided on the outer circumferential surface of the open end is fitted into the notch 2b. When the bow side sealing device 17 is installed, its flange ring is fastened to the open end of the outer shaft 2 with bolts, but when the bow side sealing device 17 is omitted, the flange ring is replaced with the flange ring as shown in the figure. A presser metal fitting 29 made of steel or the like is fastened to the open end of the outer shaft 2 with a mounting bolt 29a, and is opposed to the open end of the floating bush 5. 5b and 5c are white metals pasted on the inner and outer peripheral surfaces of the floating bush 5. When disassembling the bearing devices 3 and 4, perform the disassembly in the reverse order of the above.

When the inner shaft 1 and the outer shaft 2 are rotationally driven, an oil film is formed on the surface of the white metals 5b, 5c, 6b, 6c by the lubricating oil supplied to the bearing devices 3, 4, and the white metals 5b, 5c, 6b, 6c are floating. Bushes 5 and 6 are floating on the oil film, and white metal 5b, 5c,
The inner shaft 1 is pivotally supported via 6b and 6c. and,
The floating bushes 5, 6 receive a load in the radial direction, but do not receive a load in the axial direction, so the flanges 5a, 6a of the floating bushes 5, 6 are not restrained.

A second embodiment of the present invention is shown in FIGS. 4 and 5, in which the outer shaft 2 is attached to the inner circumferential surface of its main body in a plurality of ways (three in the figure) whose height gradually decreases toward the open end.
f) A step of about 1 to 2 mm is provided, and fixing bushes 7 and 8 made of cast iron or the like having a step on the outer peripheral surface that matches this step are inserted by cold fitting or the like and fixed to the main body, Notches 2a and 2b are formed by the inner peripheral surface of the open end of the main body and the open end surfaces of the fixing bushes 7 and 8. Then, a white metal 7 is attached to the inner peripheral surface of the fixed bushes 7 and 8.
a, 8a are attached, and white metals 5b, 6b are attached only to the inner peripheral surfaces of the floating bushes 5, 6. The other configurations are the same as in the first embodiment, and corresponding members are given the same reference numerals. The functions and effects of the second embodiment are also the same as those of the first embodiment.
This is almost the same as the embodiment.

(Operations and Effects of the Invention) In the present invention, a notch is formed inside the open end of the outer shaft by fixing a fixed bush to the outer shaft or its inner peripheral surface, and a floating bush is attached to the outer shaft or the inner peripheral surface thereof. Insert the fixed bushing from its open side into the gap between the inner circumferential surface of the fixed bushing and the outer circumferential surface of the inner shaft, and fit the collar provided on the outer circumferential surface of the open end of the floating bushing into the notch. The flange ring or retainer of the sealing device, which is removably fixed to the open end of the floating bushing, is opposed to the open end of the floating bushing. The bearing device can be easily and quickly assembled by inserting the bearing device into the shaft from its open side and fixing a flange ring or a presser fitting to the open end of the outer shaft, and the bearing device can be easily and quickly disassembled by reversing the above procedure. I can do it.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view partially cut away and omitted to show the shaft system of a counter-rotating propeller device, and FIG. The figure is an enlarged longitudinal sectional view of the part shown in Fig. 1, Fig. 3 is an enlarged longitudinal sectional view of the part shown in Fig. 1, and Figs. 4 and 5 show a second embodiment of the present invention. is an enlarged longitudinal sectional view corresponding to FIG. 2, and FIG. 5 is an enlarged longitudinal sectional view corresponding to FIG. 3. Outer shaft...2, Inner shaft...1, Propeller...11,
12, Fixed bushing...7, 8, Notch...2
a, 2b, floating button...5, 6, brim...5
a, 6a, flange ring...15a, presser fitting...29.

Claims (1)

[Scope of utility model registration request] In a counter-rotating propeller device having two propellers that are rotationally driven in opposite directions by an outer shaft and an inner shaft passing through the outer shaft, a notch is formed inside the open end of the outer shaft, and a floating bushing is formed. is inserted into the gap between the inner circumferential surface of the outer shaft and the outer circumferential surface of the inner shaft from the open side thereof, and the collar provided on the outer circumferential surface of the open end of the floating bush is fitted into the notch, and the 1. A bearing device for an inner shaft in a counter-rotating propeller device, characterized in that a presser fitting detachably fixed to the open end of the outer shaft is opposed to the open end of the floating bush.