JPS6393697A - Method and device for propelling double reverse rotating propeller - Google Patents

Abstract

PURPOSE:To make it possible to secure a propelling force even in case of emergency by making it possible to rotate an inner shaft and an outer shaft in a body and in a same direction and at the same time disconnecting power transmission to one o two propellers and generating a propelling force by means of the other propeller. CONSTITUTION:In case of emergency where an inner shaft 1 and an outer shaft 2 become unable to rotate in normal and reverse directions due to seizure of a double reverse rotating bearing 5 for making the inner shaft 1 and the outer shaft 2 rotate in normal and reverse directions, at first the inner shaft 1 and the outer shaft 2 are made in a body to be capable of rotating in a same direction. In order to do this, an internal gear 8c which has so far connected a planetary gear 8b with an external gear 8d is moved, and the external gear 8d is connected with a switching gear 12d and disengaged from the planetary gear 8b. Then, oil pressure of a hydraulic ram is released, a fixing nut 14 is separated from a boss portion 6a of a stern side propeller 6, the diameter of an inner circumference of the boss portion 6a is increased by supplying high pressure oil, power transmission from the inner shaft 1 to the stern side propeller 6 is disconnected, and a propelling force is obtained only by a bow side propeller 7. Thus, it is possible to cope with an emergency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a contra-rotating propeller propulsion method and device, and particularly relates to a contra-rotating propeller propulsion method and a contra-rotating propeller propulsion device. This invention relates to a propulsion method for a contra-rotating propeller in which one of the propellers is idly rotated to obtain propulsive force with the other single propeller, and its '4A arrangement.

[Prior art] In recent years, large ships such as cargo ships have adopted contra-rotating propeller shafts for the purpose of saving energy, and a propeller is attached to each of the inner and outer shafts to generate propulsive force. What you get is known.

As mentioned above, the contra-rotating shaft is composed of an inner shaft and an outer shaft, and in order to obtain propulsive force by rotating each propeller by rotating them in the forward and reverse directions, the inner shaft and the outer ring are connected to an output source. The power obtained from the main engine is distributed and transmitted via a power distribution device (planetary gear device).

[Problems to be Solved by the Invention] By the way, in order to enable these inner and outer shafts to rotate forward and backward, it is necessary to provide a bearing between them. There is a risk of seizure due to fatigue damage, etc.

Therefore, in the past, there was a problem in that the inner and outer shafts were stuck together due to bearing seizure, which made it impossible to drive forward and reverse rotations, resulting in a situation where propulsion was impossible.

Therefore, the present invention has been devised to effectively solve the above-mentioned problems, and in an emergency situation where the inner shaft and outer ring are stuck together and cannot rotate in the forward or reverse direction, the propeller is rotated to obtain propulsive force. The object of the present invention is to provide a contra-rotating propeller propulsion method and a device therefor.

Means and operation for solving problem E] The present invention has an inner shaft and an outer ring that rotate in forward and reverse directions with respect to each other, and when transmitting power to propellers attached to each shaft to generate propulsive force, The inner and outer shafts are made integrally rotatable in the same direction, and one of the propellers is separated from the shaft to allow free rotation, cutting off power transmission, and the other single propeller obtains propulsive force. This is how it was done.

In addition, a power distribution device that distributes the power obtained from the output source between the inner shaft and the outer ring to rotate them in forward and reverse directions, and a power distribution device that is removably fitted to the inner shaft and the outer ring to generate propulsive force. a propeller, a propeller engaging/disengaging means for cutting off power transmission to allow one of the propellers to freely rotate from its shaft, and a propeller engaging/disengaging means for integrally rotating the inner shaft and outer ring which rotate in forward and reverse directions in the same direction. It is equipped with a power switching means to ensure the generation of propulsive force in an emergency.

[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a counter-rotating shaft 3 having an inner shaft 1 and an outer shaft 2 that rotate forward and backward relative to each other is inserted and attached to the stern of a hull 4.

These inner shaft 1 and outer shaft 2 are supported through counter-rotating bearings 5 so as to be rotatable in forward and reverse directions, and the inner shaft 1 has a stern propeller 6 and the outer shaft 2 has a bow propeller 7 to provide propulsive force. is designed to occur.

Further, a power distribution device (planetary gear device f) 8 is provided in the power transmission system in order to transmit power to the inner shaft 1 and the outer shaft 2 to cause them to rotate in forward and reverse directions. This power distribution device 8 obtains power from a main engine 9 serving as an output source and equally distributes and transmits it to the inner shaft '1 and the outer shaft 2.

Specifically, as shown in FIGS. 1 and 2, the power distribution device 8 includes a sun gear 8a, a planetary gear 8b, an internal gear 8c,
While supporting the external gear 8d on the inner shaft 1, the bulkhead 10
It is designed to be housed in a casing 11 attached to. That is, the thrust load applied to the inner shaft 1 and the outer shaft 2 is received by the main engine 9, and the power distribution device 8 is supported in a floating manner. The inner shaft 1 is provided with a thrust collar 1a and a thrust pad 1b for transmitting the thrust load of the outer shaft 2 to the inner shaft 1.

Further, the power distribution device 8 is provided with a power switching means 12 for enabling the inner shaft 1 and the outer shaft 2 to rotate integrally in the same direction.

As shown in FIG. 2, this power switching means 12 is interposed between the planetary gear 8b and the external gear 8d, and includes a switching gear A712a that fits into the inner shaft 1, a 3&1 star gear 8b, and the switching gear 1.
It is composed of an internal gear 80 that passes between 2a and 2a.

A switching lever 12b for moving the internal tooth *8C in the axial direction is provided. Therefore, in the power switching means 12, the internal gear 8C connects the planetary gear 8b and the external gear 8d to rotate the inner shaft 1 and the outer shaft 2 in forward and reverse directions, and the external gear 8d and the switching gear 12a rotate in the forward and reverse directions. By connecting them and separating them from the idler gear 8b, the inner shaft 1 and the outer shaft 2 are integrally driven to rotate in the same direction.

Further, as shown in FIG. 3, the stern propeller 6 is press-fitted with its boss portion 6a into the tapered output end 1C of the inner shaft 1; A screw portion 13 and a fixing nut 14 are provided for fixing the boss portion 6a.

Boss portion 6a of the stern propeller 6 fitted to this inner shaft 1
In order to allow the propeller to freely rotate from the output end 1C of the inner shaft 1, a propeller engagement/disengagement means 15 is provided.

This propeller engagement/disengagement means 15 has a hydraulic ram 15a that presses the boss portion 6a from the fixing nut 14 toward the bow side using hydraulic pressure, and also connects the output end 1C of the inner shaft 1 from the oil supply source 16 and fits therein. It has a boss oil supply system 15b that supplies oil between the boss portion 6a and the boss portion 6a. That is, hydraulic ram 1
Remove the hydraulic pressure to 5a, and remove the fixing nut 14 and boss part 68.
Leave a gap between them, and then connect the output end 1C of the inner shaft 1 and the boss part 6.
By supplying high-pressure oil between the boss part 6a and the tapered output end 1C to inflate the boss part 6a, and pulling it out toward the fixing nut 14, the boss part 6a and the tapered output end 1C are loosely fitted and can rotate freely. Boss oil supply system 15b and hydraulic ram 15a
The ram oil supply system 15C for refueling each valve 1
7.17, and is disposed through a passage 1d formed along the axis of the inner shaft 1.

Next, we will discuss the promotion method.

As shown in FIGS. 1 and 2, the counter-rotating bearing 5 for driving the inner shaft 1 and the outer shaft 2 in forward and reverse rotations has seized up, causing the inner shaft 1 and the outer shaft 2 to rotate in the forward and reverse directions during the voyage. There is a risk that a situation in which rotation will not be possible may occur.

In such an emergency, first, the inner shaft 1 and the outer shaft 2 are integrated so that they can rotate in the same direction.

For this purpose, as shown by the arrow in FIG.
, connects the external gear 8d and the switching gear 12a,
It is cut off from the planetary gear 8b.

That is, the power is selectively transmitted by the power switching means 12, so that the inner shaft 1 and the outer shaft 2 can rotate integrally in the same direction.

In case of C, rotating both the inner shaft 1 and the outer shaft 2 integrally in the same direction cancels out the propulsive forces generated because the propellers 5 and 6 are twisted in opposite directions. .

Therefore, after the inner shaft 1 and the outer shaft 2 are made integrally rotatable in the same direction, power transmission to either the bow propeller 5 or the stern propeller 6 is cut off. In the present invention, power transmission to the stern propeller 6 is cut off by the propeller engagement/disengagement means 15.

That is, as shown in FIG.
Separate from a. Next, high pressure oil is supplied from the boss oil supply system 15b between the boss portion 6a and the output end 1c of the inner shaft 1 to expand the diameter of the inner peripheral surface of the boss portion 6a. As a result, the boss portion 6a is slidably detached from the output end 1C of the inner shaft 1 in the stern direction, and the power from the inner rotary shaft 1 is cut off to the stern propeller 6.

That is, oil is supplied between the inner circumferential surface of the boss portion 6a and the output end 1C of the inner shaft 1 to form an oil film, thereby forming a sliding bearing.

Therefore, the stern propeller 6 rotates idly, and the power is substantially transmitted to the bow propeller 5, so that only a single propeller is used to obtain propulsive force.

As described above, the present invention focuses on obtaining propulsive force by having two propellers, and the inner shaft 1 and the outer shaft 2, which rotate forward and backward, can be integrally rotated in the same direction by the power switching means 12. At the same time, by cutting off the power transmission to one of the propellers 5.6 by the propeller engagement/disengagement means 15, the inner shaft 1 and the outer shaft 2 can no longer be rotated in the forward or reverse direction, thus securing propulsion force even in an emergency. can do.

[Effects of the Invention] In summary, according to the present invention, the inner shaft and the outer shaft can be rotated integrally in the same direction, and power transmission to one of the propellers is cut off so that thrust is generated by the other propeller. Therefore, the propulsion force can be secured in an emergency when the inner shaft and the outer shaft cannot be rotated forward or backward.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view showing the power transmission system of FIG. 1, and FIG. 3 is a sectional view of the propulsion system of FIG. 1. In the figure, 1 is an inner shaft, 2 is an outer shaft, 6 and 7 are propellers, 8 is a power distribution device, 12 is a power switching means, and 15 is a propeller engagement/disengagement means. Patent Applicant: Ishikawajima Harima Ju]-Gyo Co., Ltd. Representative Patent Attorney Nobuo Kinutani 1*Ii
8 Power distribution device 2 outside*1 12 Power switching means 6.7 Propeller 15 Propeller engagement/disengagement means Fig. 2 Fig. 3

Claims (2)

[Claims] (1) It has an inner shaft and an outer shaft that rotate forward and backward, and when generating propulsive force by transmitting power to the propeller attached to each shaft, the inner shaft and the outer shaft are rotated in the same direction. A contra-rotating device characterized in that it is made to be able to rotate integrally, and that one of the propellers is detached from its shaft to rotate freely, cutting off power transmission, and that the other single propeller obtains propulsive force. How to propel a propeller. (2) A power distribution device that distributes power obtained from an output source to an inner shaft and an outer shaft to rotate them in forward and reverse directions; A fitted propeller, a propeller engaging/disengaging means for cutting off power transmission to allow one of the propellers to freely rotate from its shaft, and the above-mentioned forward and reverse rotating inner and outer shafts are integrally rotated in the same direction. A propulsion device for a counter-rotating propeller, characterized in that it is equipped with a power switching means for switching the propeller.