JPS60213598A - Bearing in contrapropeller device for ship - Google Patents

Abstract

PURPOSE:To maintain the function of bearings serving as bearings effective for a contrapropeller device, by using roller bearings as the bearing for supporting the inner shaft of a contrapropeller and slide bearings as the bearings for supporting the outer shaft thereof. CONSTITUTION:An inner shaft is supported by roller bearings 6 secured on the inner peripheral surface of an outer shaft 2 which is supported to slide bearings 7 secured to a hull 3. The inner shaft 1 is rotated in the direction A while the outer shaft 2 is rotated in the direction B by means of a main unit, that is, they are rotated in opposite directions at an equal speed. Even if the outer shaft and the inner shaft are rotated in opposite directions at an equal speed, the load support function of bearings for supporting the inner shaft is surely maintained with no problem since the roller bearings are used for supporting the inner shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in propeller shaft bearing devices for ships propelled by counter-rotating propellers.

FIG. 1 shows an example of the configuration of a bearing in a conventional counter-rotating propeller device.

In the same figure, 01 is the inner shaft, 02 is the outer shaft, and 03 is the hull.

04I''i Stern side propeller fixed to the inner shaft, 05 is the bow side propeller fixed to the outer shaft, 06 is a sliding bearing for supporting the inner shaft fixed to the inner peripheral surface of the outer shaft, 07 is an outer shaft support fixed to the hull 08 indicates the sealing device, arrow A indicates the direction of rotation of the inner sleeve, and arrow 11.it indicates the direction of rotation of the outer shaft.

The inner shaft 01 has a sliding bearing 06 fixed to the inner peripheral surface of the outer shaft 02.
The outer shaft 02 is supported by a sliding bearing 07 fixed to the hull 08.

At this time, 11ilb o l is the rotation direction 1 (or the opposite) indicated by the arrow type, 1AIl! 11102 is rotated in the opposite direction at the same rotation speed by a main engine (not shown) in the direction of rotation shown by arrow B (or in the opposite direction).

However, the conventional counter-rotating propeller bearing device described above has the ninth fatal drawback.

In other words, the sliding bearing 06 supporting the inner shaft 01 supports the outer shaft 0.
If the outer shaft 02 is fixed to the inner circumferential surface of the inner shaft 01 and rotates in the same direction as the inner shaft 01, an oil film will theoretically occur on the sliding part between the inner shaft 01 and the inner sleeve sliding bearing 06. -The advantage is that it is of no use as a bearing. A possible solution to this case would be to modify the shape of the bearing and the shape of the oil groove.

This cannot be a fundamental solution.

Therefore, we adopted a rolling bearing for the inner shaft support bearing in order to eliminate the drawbacks of the bearings of conventional counter-rotating propeller units for ships, give the inner shaft support bearing a load capacity, and improve the reliability of the shaft system as a whole. (I thought) 11 times. In the case of a rolling bearing, the conditions of the same rotation speed and opposite rotation, which would prevent oil film formation in the case of a sliding bearing, do not pose a problem in maintaining the load capacity of the bearing. In other words, the inner shaft is supported by the bearing of the contra-rotating propeller device for ships according to the present invention.

The rolling bearing fixed to the inner peripheral surface of the outer shaft and the bearing of the counter-rotating propeller device for ships of the present invention will be explained with reference to the following nine drawings. Fig. 2 is a diagram showing one embodiment of the device of the present invention. And.

1 is the inner shaft, 2 is the outer shaft, 3 is the hull, 4 is the stern propeller fixed to the inner shaft, 5 is the bow propeller fixed to the outer shaft, 6 is the inner shaft support fixed to the inner peripheral surface of the outer shaft 7 is a sliding bearing for supporting the outer shaft fixed to the hull; 8 is a foil seal; arrow A; direction of rotation of the inner shaft; arrow 13, direction of rotation of the outer shaft.

The inner shaft 11 is supported by a rolling bearing 6 fixed on the inner circumferential surface of a, 'III+2, and the outer shaft 2 is supported by a sliding bearing 7 fixed to the hull 3.

The inner shaft 1 rotates in the direction indicated by arrow A (or in the opposite direction).

The support bearing of the inner shaft 1 is a rolling bearing. Therefore, even if the inner and outer shafts rotate in opposite directions at the same rotation speed, the load capacity as an inner shaft support bearing is maintained without any problem.

With the device of the present invention, a first-order effect can be obtained.

(1) The bearing configuration uses a rolling bearing for the inner II support i11+ bearing of the counter-rotating propeller, and a Suberi 111 bearing for the inner shaft support bearing, which effectively functions as a bearing for the counter-rotating propeller device. , it is possible to hold the string.

(2) Since the structure of the bearing itself is simple, maintenance work such as assembly and opening of the bearing is easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a bearing of a conventional counter-rotating propeller device for ships. FIG. 2 is a vertical cross-sectional view of a bearing portion of a bearing of a counter-rotating propeller device for ships according to an embodiment of the present invention. Ol, 1...Inner shaft, 02,2...Outer shaft, 08,8...
・Hull, 04°4...Stern propeller, 05,5...
Bow side propeller. 06... Sliding bearing for supporting the inner shaft, 6... Rolling bearing for supporting the inner shaft, 07,7... Sliding bearing for supporting the outer shaft,
08°8...Rail device, A...Rotation direction of inner shaft,
B...Rotation direction of the outer shaft. Continuing from page 1 [Phase] Inventor Akizo Morohoshi 0 inventions in Akunoura-cho, Nagasaki city Inventor Shintabe Watanabe 0 inventions in Akunoura-cho, Nagasaki city Inventor Kazuyuki Tsuchihashi 0 inventions in Akunoura-cho, Nagasaki city Inventor Hiroshi Nohara 0 Inventor Susumu Murakami 1-1 Akunoura-cho, Nagasaki City
Mitsubishi Heavy Industries, Ltd. Nagasaki Laboratory 1-1 Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard & Machinery Works 00^

Claims (1)

[Claims] A bearing for a counter-rotating propeller device for a ship, characterized in that the propulsion bearing device for a ship propelled by a counter-rotating propeller is configured such that the inner shaft is supported by a rolling bearing and the outer shaft is supported by a sliding bearing.