JPH0679919B2 - Counter-rotating propulsion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a counter-rotating propulsion device, and more particularly to a counter-rotating propulsion device with an improved bearing structure adopted for a counter-rotating shaft.

[Prior Art] As shown in Fig. 3, the counter-rotating propulsion device includes a pair of screw propulsion devices b and c which are coaxial with the stern a and are arranged in series along the axial direction in opposite directions. It is designed to generate thrust by being driven to rotate. In this case, a counter-rotating shaft d is employed to drive these propulsion devices b and c coaxially in opposite directions. The counter-rotating shaft d is configured by inserting an inner shaft f that drives a stern-side propulsion device c into a hollow outer ring e that drives a bow-side propulsion device b. By transmitting to the inner and outer shafts f and e in opposite directions via the gear mechanism h, the pair of propulsion devices b and c can be inverted with each other at substantially equal rotational speeds. Then, between the outer shaft e and the inner shaft f, in order to facilitate smooth reversal of these, the outer shaft e in the illustrated example
A roller bearing j is provided between the thruster position i on the bow side and the inner shaft f. Incidentally, r is a bearing for the outer shaft.

[Problems to be Solved by the Invention] By the way, using such a counter-rotating shaft d, a pair of propulsion devices b and c are coaxially rotationally driven in opposite directions to generate thrust. In the device, the roller bearing j, which is interposed between the outer shaft e and the inner shaft f of the counter rotating shaft d and supports them in a reversible manner, loses the clearance due to seizure or thermal expansion. There is a possibility that the inner and outer shafts f and e may be fixed to each other to lock their mutual rotation. That is, when the roller bearings j are fixed, the inner and outer shafts f and e, which are reversed from each other, restrict the local rotation and become unrotatable. In such a state, the power transmission to the propulsion devices b and c by the counter-rotating shaft d becomes impossible thereafter, and there is a problem that it becomes impossible to continue the navigation. Therefore, it is desired to devise a highly reliable propulsion system that can continue navigation even in such an emergency.

[Means for Solving Problems] The present invention comprises a hollow outer shaft and an inner shaft that is inserted into the outer shaft, and a pair of propulsion devices that are respectively attached to the inner and outer shafts are coaxially arranged. In a counter-rotating propulsion device having counter-rotating shafts that are driven in reverse to each other, a roller bearing that is provided between an outer shaft and an inner shaft and supports them in a reversible manner, and a roller bearing that is provided between the outer bearing and the inner bearing A slide bearing for supporting relative rotation of the bearing, a regulating means for engaging the slide bearing with the inner shaft to regulate the relative rotation and releasing the regulation when the roller bearing is locked, and an inner shaft for releasing the regulating means. Alternatively, it is provided with a lock means for restricting the rotation of either one of the outer shafts.

[Operation] The operation of the present invention will be described. The roller bearing supports the inner and outer shafts in a reversible manner, transmits the engine power to a pair of propulsion devices, and the roller bearing burns during normal navigation. When the inner and outer shafts are stuck to each other due to sticking or the like, thereafter, the inner and outer shafts are rotatably supported by a slide bearing. The sliding bearing does not exert its bearing function by being engaged with the inner shaft by the restricting means during normal navigation, and when the roller bearing is locked, the restriction by the restricting means is released and the roller bearing is fixed to the outer shaft side. The bearing and the inner shaft are rotatably supported relative to each other. In particular, in a plain bearing, when the inner and outer shafts are inverted from each other, the oil film pressure cannot be generated as a gas, and thus the bearing performance cannot be sufficiently exhibited. Therefore, after shifting to the rotation support by the slide bearing, the rotation of either the inner shaft or the outer shaft is restricted by the locking means to ensure the bearing capacity of the slide bearing. In this way, by transmitting engine power to the other shaft while controlling the rotation of either the inner or outer shaft, the bearing function is ensured by the plain bearings and continuous navigation with a single shaft is possible even in an emergency. Has become.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the counter-rotating shaft 1 includes a hollow outer shaft 2 and an inner shaft 3 that is inserted through the outer shaft 2 in the axial direction. A bow-side propulsion boss 4 and a stern-side propulsion boss 5 are coaxially and axially superposed on the end of the inner shaft 3 extending outwardly from the end of No. 2, respectively. The inner and outer shafts 3 and 2 are rotationally driven in opposite directions, so that the pair of propulsion devices 6 and 7 are coaxially inverted.

Between the outer shaft 2 and the inner shaft 3 of the counter-rotating shaft 1 configured in this manner, in the illustrated example, the tubular bow-side propulsion device boss 4 and the inner shaft 3 which are connected to the outer shaft 2. An annular roller bearing 8 is provided between and in order to support them in a reversible manner. In the illustrated example, a self-aligning roller bearing is shown as the roller bearing 8. To mount the roller bearing 8, a recess 9 surrounding the inner shaft 3 is defined along the axial direction of the propeller boss 4, and the outer ring 10 is fitted into the sleeve body 11 mounted in the recess 9 and the inner ring is fitted. 12 is an annular slide bearing which will be described later 13
It is mounted on the inner shaft 3 via the sleeve, and is inserted and fixed in the radial direction between the inner and outer shafts 3 and 2 by the sleeve body 11 and the slide bearing 13.

The roller bearing 8 configured as described above is provided with a sliding member such as a white metal which supports the roller shaft 8 and the inner shaft 3 so as to be rotatable relative to each other and allows the outer shaft 2 and the inner shaft 3 to rotate relative to each other. A bearing 13 is provided. The slide bearing 13 is fixed to the inner ring 12 of the roller bearing 8 and is configured to rotatably support the inner shaft 3 from the roller bearing 8 side.

Further, between the inner shaft 3 and the slide bearing 13, the slide bearing 13 is engaged with the inner shaft 3 to restrict the relative rotation between them, and
When the roller bearing 8 is seized or the like and is fixed and locked, a regulation means 14 for releasing the regulation of the relative rotation is provided. The restricting means 14 includes a clamp ring 15 which is fixed so as to surround a peripheral side portion of the inner shaft 3 and the clamp ring 15.
15 and a shear pin 17 which is provided at intervals along the circumferential direction of the sliding bearing 13 and is inserted into a groove portion 16 formed at an axially peripheral end portion of the sliding bearing 13 to engage with the sliding bearing 13 in the rotational direction thereof. To be done. Then, the regulation means 14 is used for the roller bearing 8
When the inner and outer shafts 3, 2 are inverted with each other due to the action of, the shear pin 17 engages the slide bearing 13 from the direction of rotation thereof so that the inner ring 12 and the slide bearing 13 of the roller bearing 8 are engaged with each other.
When the roller bearing 8 is locked, the rotating forces of the inner and outer shafts 3 and 2 which are reversed from each other
Shearing force generated between the slide bearing 13 fixed to the inner ring 12 of the roller bearing 8 fixed to the outer shaft 2 side and the clamp ring 15 fixed to the inner shaft 3 by breaking the shear pin 17 to cause the slide bearing 13
Is configured to be separated from the inner shaft 3 side. As a result, the inner shaft 3 and the outer shaft 2 can be relatively rotated by the slide bearing 13.

Further, the shear pin 17 of the restricting means 14 detects the breakage thereof so that the bearing function of the inner and outer shafts 3 and 2 is changed from the roller bearing 8 to the slide bearing 1.
Detecting means 18 for detecting the shift to 3 is provided.
The detecting means 18 is composed of an electric wire 19 arranged on the shear pin 17 from the clamp ring 15 side to the slide bearing 13 side, and the electric wire 19 is a hollow core portion 20 of the stern side propeller boss 5 and the inner shaft 3.
Etc. to the engine control panel. When the shear pin 17 is broken in the energized state due to the breakage of the shear pin 17, the detecting means 18 inputs the disconnection signal to the engine control panel. The engine is stopped by this disconnection signal.

On the other hand, FIG. 2 shows a planetary gear mechanism 21 provided between the engine and the counter-rotating shaft 1 for transmitting the input engine power while distributing it to the inner and outer shafts 3, 2. This planetary gear mechanism 21
Is a general structure, and the sun gear 22 provided on the inner shaft 3
A planetary gear 24 that is rotatably supported by a housing 23 fixed to a machine base 50 while being revolved and meshes with a sun gear 22; and an annular internal gear 25 that meshes with the planetary gear 24.
Composed of and. A planetary gear is attached to the inner gear 25 via the flange coupling 26 on the outer shaft 2.
An annular external gear 27 arranged axially adjacent to 24 is meshed. A part of the engine power is directly transmitted to the inner shaft 3, and the rest is input to the planetary gear mechanism 21, the rotation direction is reversed by the planetary gear mechanism 21, and the engine power is transmitted from the inner gear 25 to the outer shaft 2. It has become so. The planetary gear mechanism 21 configured as described above is provided with the locking means 28 for restricting the rotation of the outer shaft 2 when the restriction means 14 is released. This is because when the bearing functions of the inner and outer shafts 3 and 2 shift from the roller bearing 8 to the sliding bearing 13 in an emergency, if these inner and outer shafts 3 and 2 are continuously reversed, the bearing surface of the sliding bearing 13 will be changed. Since it is not possible to generate an appropriate oil film pressure and the bearing capacity of the slide bearing 13 cannot be secured sufficiently, when the bearing function shifts to the slide bearing 13, the rotation of the outer shaft 2 is regulated and the internal movement of the slide bearing 13 is restricted. The configuration is such that the rotation support of the shaft 3 is performed with the rotation-restricted outer shaft 2 side as the fixed side. Specifically, this locking means 28 is mainly
A fixed external gear 30 fixed in the housing 23 so as to be adjacent to the external gear 27 of the outer shaft 2 in the axial direction, and a planetary gear 24 and an external gear 27 movably provided in the housing 23 along the axial direction.
And an internal gear 25 that is moved and disengaged from the planetary gear 24 and is simultaneously meshed with the external gear 27 and the fixed external gear 30.
One end is engaged with the engaging recessed portion 31 formed at the other end, and the other end has an operating end 33 extended to the outside of the housing 23 through a long hole 32 formed at the housing 23. And a shifter 34 that moves 25 in the axial direction. The locking means 28 moves the shifter 34 to couple the external gear 27 to the fixed external gear 30 by the internal gear 25, thereby the outer shaft 2
Is fixed from the stern bulkhead 29 side to restrict its rotation.

Next, the operation of the embodiment will be described.

During normal navigation, the inner shaft 3 and outer shaft 2 of the counter-rotating shaft 1
Are reciprocally supported by roller bearings 8, and the engine power is transmitted by rotation in opposite directions, and propelled by a pair of propulsion devices 6, 7. At this time, the slide bearing 13 is fixed to the inner shaft 3 side by the restricting means 14 and integrally rotates, so that the bearing function is not exerted.

When the roller bearing 8 is locked due to seizure or thermal expansion in the propulsion state due to such double reversal, and the reversal of the inner and outer shafts 3 and 2 is locked, the inner and outer shafts 3 and 2 are locked. The shear pin 17 of the regulating means 14 is broken by the reversing force, and the regulating means
The restriction of the plain bearing 13 by 14 is released. As a result, the post-sliding bearing 13 exhibits the bearing function.

By the way, the slide bearing 13 cannot exhibit sufficient bearing capacity when the inner and outer shafts 3, 2 are reversed. Here, the state in which the bearing function is transferred to the slide bearing 13 is detected by the detecting means 18, and the engine is once stopped. Further, the disconnection signal of the detection means 18 activates the lock means 28, and the rotation of the outer shaft 2 is restricted. As a result, the plain bearing
The inner shaft 3 can be rotatably supported relative to the fixed outer shaft 2, and the rear shaft 13 is supported by the sliding bearing 13 to transmit the engine power to the inner shaft 3 to form a single stern-side propulsion unit. You can continue sailing at 7. At this time, the planetary gear mechanism 21
Then, the internal gear 25 is disengaged from the planetary gear 24, and the power transmission to the outer shaft 2 is cut off.

In the above embodiment, the rotation of the outer shaft 2 is regulated by the locking means 28, but the outer shaft 2 may be rotationally driven to regulate the rotation of the inner shaft 3 by the locking means 28. good.

Further, in the above embodiment, the sliding bearing 13 is provided to support the space between the inner shaft 3 and the roller bearing 8 on the outer shaft 2 side. However, the sliding bearing is formed between the outer shaft 2 and the bearing 8. 13 is provided,
This may be configured to be engaged with the outer shaft 2 by the restricting means 14.

Further, in the above embodiment, the roller bearing 8 provided on the bow side propulsion device boss 4 has been described, but it goes without saying that the present invention may be applied to the roller bearings 8 provided at other locations.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

A roller bearing that supports the inner and outer shafts of the counter-rotating shaft so that they can be reversed, and a slide bearing that supports the outer shaft and the inner shaft so that they can rotate relative to each other are provided on top of this roller bearing. The sliding bearing is engaged with the inner shaft side by means, and when the roller bearing is locked, the regulation is released to shift the bearing function to the sliding bearing. Since it has been regulated to ensure that the bearing capacity of the slide bearing is fully exerted, even if the inner and outer shafts cannot be reversed, such as when the roller bearing is stuck, etc., it will continue through either one of the shafts. Can transmit engine power,
The reliability of the propulsion system can be improved by enabling continuous navigation even in times of emergency.

[Brief description of drawings]

1 is a side sectional view showing a preferred embodiment of the present invention, FIG. 2 is a side sectional view showing a locking means adopted in the present invention, and FIG.
The drawing is a side sectional view showing the counter-rotating propulsion device. In the figure, 1 is a counter-rotating shaft, 2 is an outer shaft, 3 is an inner shaft, 6 and 7 are thrusters, 8 is a roller bearing, 13 is a sliding bearing, 14 is a regulating means,
28 is a locking means.

Claims (1)

[Claims] 1. A double reversal device comprising a hollow outer shaft and an inner shaft inserted through the outer shaft, and a pair of propulsion devices respectively mounted on the inner and outer shafts and driven to reciprocate coaxially with each other. In the counter-rotating propulsion device having, a roller bearing provided between the outer shaft and the inner shaft and supporting the outer shaft and the inner shaft so as to be reversible, and the roller bearing provided on the roller bearing, and the inner shaft and the inner shaft being relatively rotatable. A sliding bearing to support, a regulation means that engages the sliding bearing with the inner shaft to regulate the relative rotation and releases the regulation when the roller bearing is locked, and the inner shaft or the inner shaft when releasing the regulation means. A counter-rotating propulsion device comprising: a locking means for restricting rotation of either one of the outer shafts.