JPH0353083Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention uses a planetary gear system to connect a hollow outer rotating shaft and an inner rotating shaft coaxially inserted into the outer rotating shaft via a bearing. The present invention relates to a power transmission mechanism that transmits power in opposite directions.

[Prior Art] Conventionally, aircraft such as helicopters have been equipped with counter-rotating blades, counter-rotating impellers, etc. for blowers, pumps, etc., and even for large ships, propulsion efficiency has been improved. Equipped with counter-rotating propellers is being considered to improve performance and save energy.

As shown in Fig. 5, conventional counter-rotating propellers of this type are constructed by rotating a pair of propellers b and c in opposite directions, which are coaxially arranged at the stern a of a ship and oppositely pitched to each other. , it has become possible to generate propulsive force. That is, one propeller c is attached to a hollow outer rotating shaft e, and the other propeller b is attached to an inner rotating shaft f inserted through a bearing f, and the power of the main engine g is
The power is appropriately transmitted to both rotating shafts e and f via a gear train h such as a planetary gear system.

[Problem to be solved by the invention] By the way, in such a counter-rotating shaft transmission mechanism, when seizure occurs with the bearing i, the outer rotating shaft e and the inner rotating shaft f become stuck together. This restricts each other's rotation, making it impossible to rotate.
Not only will the propulsion drive not be able to continue, but the gear train h
There was a problem that the power transmission mechanism including the power transmission mechanism could be damaged. That is, when the rotating shaft becomes stuck, it is necessary to immediately interrupt power transmission in the reverse direction.

It is desirable that the configuration for this purpose be a simple and reliable mechanism that can reliably cut off power transmission and that does not require any changes to the precisely formed gear train h.

In view of the above circumstances, the present invention was devised to provide a reliable and simple power transmission mechanism that can reliably cut off the power transmission of the counter-rotating shaft.

[Means for Solving the Problems] The present invention is such that a hollow outer rotating shaft and an inner rotating shaft coaxially inserted into the outer rotating shaft via a bearing are reversed with respect to each other by a planetary gear device. In a power transmission mechanism that transmits power, a sleeve body surrounds an inner rotating shaft, one end is connected to a planetary gear device, and the other end has a flange; The device includes a flange coupling that faces each other with a clearance therebetween, and a split ring that is removably fastened between the flange coupling and the sleeve body and can be divided in the radial direction.

[Operation] With the above configuration, the drive rotation applied to the inner rotating shaft reaches the planetary gear device via the flange coupling, split ring, and sleeve body, and is converted into rotation in the opposite direction, resulting in outer rotation. transmitted to the shaft. When the bearing seizes, etc., the fastening at the flange is released and the split ring is detached, creating a clearance between the sleeve body and the flange coupling ring, cutting off power transmission.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the power transmission mechanism according to the present invention.

This power transmission mechanism includes a planetary gear device 13 that transmits power between a hollow outer rotary shaft 4 and an inner rotary shaft 6 coaxially inserted into the outer rotary shaft 4 via a bearing 5 in such a manner that they are inverted from each other; A sleeve body 15 that surrounds the inner rotating shaft 6 and has one end connected to the planetary gear set 13 and the other end having a flange 41, and a flange 4 of the sleeve body 15 that is fitted onto the inner rotating shaft 6.
It is mainly composed of a flange coupling 12 opposed to the flange coupling 12 with a predetermined clearance S in the axial direction, and a split ring 22 detachably provided between the flange coupling 12 and the sleeve body 15. .

The inner rotating shaft 6 is connected to an intermediate shaft 11 connected to engine power at its end, and is driven to rotate integrally with a flange coupling 12. Further, the outer rotating shaft 4 is rotatably supported by the housing 7 via a thrust bearing 8 and a radial bearing 9.

The planetary gear device 13 includes an annular sun gear 16 that coaxially surrounds the inner rotating shaft 6, a planetary gear 17 that is rotatably supported by the housing 7 while its revolution is restricted, and meshed with the sun gear 16. It is composed of an annular internal gear 18 meshed with this planetary gear 17. The sun gear 16 is fitted into one end of the sleeve body 15 at its inner peripheral portion, and the internal gear 18 is meshed with a gear portion 4a formed on the outer rotating shaft 4.
The rotation is converted in the opposite direction and transmitted to the outer rotating shaft 4.

The split ring 22 is formed to be able to be divided into two in the radial direction, has a plate thickness corresponding to the clearance S, and is fastened together to the flange 4 and the flange coupling 12 with bolts (not shown). It's getting old.

Next, the operation of this embodiment will be explained.

The driving rotation applied to the inner rotary shaft 6 from the intermediate shaft 11 is transmitted from the flange coupling 12 to the sun gear 16 of the planetary gear set 13 via the split ring 22 and the sleeve body 15. This rotation is converted into rotation in the opposite direction by passing through the planetary gear 17 and the internal gear 18 and is transmitted to the outer rotating shaft 4.

When the bearing 5 seizes, etc., the rotational force is transmitted from the bearing 5 to the outer rotating shaft 4 in the same direction as the inner rotating shaft 6, but the flange coupling 12 and the sleeve body 15 At the same time, remove the bolts that fasten the split ring 22.
The split ring 22 is separated from between the flange coupling ring 12 and the sleeve body 15. This creates a clearance S between the sleeve body 15 and the flange coupling 12, and power transmission by the planetary gear device 13 is cut off.

In this way, the sleeve body 15 that surrounds the inner rotating shaft 6 and has one end connected to the planetary gear set 13 and the other end having the flange 41 is fitted to the inner rotating shaft 6 and has a clearance S in the axial direction with the sleeve body 15. Since the flange coupling 12 is provided with the flange coupling 12 facing away from each other and the split ring 22 is removably fastened between the flange coupling 12 and the sleeve body 15, the planetary gear set 13 can be removed by detaching the split ring 22. It is possible to reliably cut off the power transmission due to the rotation of the rotating shafts 4 and 6, and prevent the rotation of both rotating shafts 4 and 6 from being impossible due to rotation restriction, thereby preventing the planetary gear device 13 from being damaged. Since the present invention is a simple mechanism without any changes to the meshing mechanism of the planetary gear device 13, it is highly versatile and reliable.

Next, a specific embodiment of the present invention will be explained with reference to FIG.

This specific embodiment shows a case in which the power transmission mechanism of the above embodiment is applied to a counter-rotating propeller, and screw propulsion mechanisms are formed on the inner rotating shaft 4 and the outer rotating shaft 6, respectively, with opposite pitches. It is constructed by attaching containers 1 and 2.

In particular, this counter-rotating propeller is equipped with a pitch changing mechanism 23 so that a predetermined forward propulsion force can be obtained even if the rotating shafts 4 and 6 are rotated in the same direction due to seizure of the bearing 5 or the like.

This pitch changing mechanism 23 is provided in the stern propeller 1 of the inner rotating shaft 4 and engages with a crosshead 40 attached to the proximal end of the blade 25, and a crosshead 40 provided in the propeller boss 24. A yoke 26 that rotates the crosshead 40 by being reciprocated; an oil passage 27 that is formed through the inner rotating shaft 6 along its axial direction and that supplies and discharges hydraulic oil for reciprocating the yoke 26; It mainly consists of a supply/discharge port 28 formed in the flange coupling 12 and for communicating the oil passage 27 to the outside of the shaft.

By supplying and discharging hydraulic oil from the supply/discharge port 28 to the yoke 26 via the oil passage 27, the yoke 26 is reciprocated, the crosshead 40 is rotated, and the pitch angle of the blade 25 can be changed. attitude.

With this configuration, even if the bearing 5 seizes and the outer rotating shaft 4 rotates with the inner rotating shaft 6, the propellers 1 and 2 can be pitched in the same direction. It is possible to obtain directional propulsion.

FIG. 3 shows another specific embodiment, in which a variable pitch mechanism 51 has a cylinder chamber 30 defined by a sleeve 29 provided between an intermediate shaft 11 and a flange coupling 12, and an inner It mainly consists of a rod 32 that is inserted through the rod 32 so as to be able to reciprocate in the axial direction along the rotating shaft 6, and a pair of supply and discharge ports 28 that supply and discharge hydraulic oil to and from a cylinder chamber 30 formed in the sleeve 29.

One end of the rod 32 is connected to a piston 31 provided in the cylinder chamber 30, and the other end is connected to the yoke 26 shown in the above-described specific embodiment. When it is done,
The rod 32 reciprocates to drive the yoke 26 and change the pitch angle.

Other configurations and effects are the same as those in the embodiment and specific embodiment, so the same reference numerals are given.
The explanation will be omitted.

FIG. 4 shows another specific embodiment of the present invention, in which the variable pitch mechanism 52 has a first bevel gear 33 attached to the crosshead 40 and a second bevel gear 34 meshed with the first bevel gear 33.
A gear 36 is provided in a sleeve-shaped gear box 35 interposed between the intermediate shaft 11 and the flange coupling 12, and a gear 36 is inserted into the inner rotating shaft 6 so as to be rotatable along its axial direction. rotating rod 37
and an operating rotating shaft 3 extending outward from the gear box 35.
8 and a pinion 39 meshed with the gear.

The rotating rod 37 has one end connected to the gear 36 and the other end connected to the second bevel gear 34, and when the pinion 39 is rotated, the crosshead 40 is rotated to change the pitch angle of the blade 25. I'm starting to be able to do it.

Other configurations and effects are the same as those in the embodiment and specific embodiment, so the same reference numerals are given.
The explanation will be omitted.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

A hollow outer rotary shaft, an inner rotary shaft coaxially inserted into the outer rotary shaft via a bearing, a planetary gear device that transmits power so as to rotate them mutually, and a planetary gear device surrounding the inner rotary shaft. a sleeve body that is connected to a planetary gear at one end and has a flange at the other end; a flange coupling that is fitted onto the inner rotating shaft and faces the flange of the sleeve body with a predetermined clearance in the axial direction; Since the split ring is removably fastened between the sleeve body and the split ring that can be split in the radial direction, power transmission by the planetary gear device can be reliably cut off by detaching the split ring, and the planetary gear Since it is a simple mechanism that requires no changes to the device's meshing mechanism, it is highly versatile and reliable.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the power transmission mechanism according to the present invention, Fig. 2 is a side sectional view showing a contra-rotating propeller which is a specific embodiment of the invention, and Fig. 3 is a side sectional view showing an embodiment of the power transmission mechanism according to the present invention. Side sectional view showing another specific embodiment, No. 4
The figure is a side sectional view showing another specific embodiment, and FIG. 5 is a side sectional view showing a counter-rotating propeller for explaining the conventional technology. In the figure, 4 is the outer rotating shaft, 5 is the bearing, 6 is the inner rotating shaft, 12 is the flange coupling, 13 is the planetary gear mechanism, 15 is the sleeve body, 22 is the split ring, 41 is the flange, and S is the clearance. be.

Claims (1)

[Scope of utility model registration request] In a power transmission mechanism that transmits power between a hollow outer rotating shaft and an inner rotating shaft coaxially inserted into the outer rotating shaft via a bearing, the inner rotating shaft a sleeve body that surrounds the sleeve body and has one end connected to the planetary gear device and a flange at the other end; and a flange cup that is fitted onto the inner rotating shaft and faces the flange of the sleeve body with a predetermined clearance in the axial direction. A power transmission mechanism comprising: a ring; and a split ring detachably fastened between the flange coupling ring and the sleeve body and splittable in the radial direction.