JPH0565794U - Counter-rotating propeller device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the possibility of breakage of the rear propeller shaft of the contra-rotating propeller device. [Structure] A rear propeller boss 3 is fixed to a rear end of a hollow rear propeller shaft 1. A hollow front propeller shaft 2 is concentrically arranged outside the rear propeller shaft 1. The front propeller boss 5 is fixed to the rear end of the front propeller shaft 2. The counter rotating bearing 8 is interposed between the inner peripheral surface of the front propeller boss 5 and the outer peripheral surface of the rear propeller shaft 1. A lead wire 11 connected to a sensor 12 that monitors the temperature of the lubricating oil 9 that lubricates the counter rotating bearing 8 is passed through the hole 13 of the rear propeller boss 3 from the inside of the rear propeller shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a counter-rotating propeller device as a propulsion device for a ship, and more particularly to a counter-rotating propeller device capable of monitoring the temperature of lubricating oil of a counter-rotating bearing.

[0002]

[Prior Art]

 In order to improve the propulsion performance of ships, counter-rotating propeller devices have been used as propulsion devices for ships.

In the counter-rotating propeller device, as shown in an example in FIG. 4, a hollow front propeller shaft 2 is concentrically arranged outside a rear propeller shaft 1 with a required space. A rear propeller boss 3 is integrally attached to the rear end of the rear propeller shaft 1, a rear propeller 4 is disposed, and a flange portion 2a is provided at the rear end of the front propeller shaft 2. The front propeller boss 5 is integrally attached to the flange portion 2a to dispose the front propeller 6, and the sealing device 7 is provided on the opposing surface side of the front propeller boss 5 and the rear propeller boss 3 arranged at the front and rear, The inside and outside of the propeller bosses 3 and 5 can be sealed, and a double reversal bearing 8 is provided between the outer surface of the rear propeller shaft 1 and the inner peripheral surface of the front propeller boss 5, and the rear propeller 4 is mounted. Through the counter-rotating bearing 8 to the front propeller shaft 2 It is supported and rotatable. Further, the front end of the rear propeller shaft 1 serving as the inner shaft and the front end of the front propeller shaft 2 serving as the outer shaft are connected to a drive device via a planetary gear device (not shown), or to separate drive devices. Therefore, the front propeller 6 and the rear propeller 4 are made to rotate in reverse.

In the counter-rotating propeller device as described above, in order to protect the counter-rotating bearing 8 supporting the rear propeller shaft 1 and the front propeller boss 5 rotating at high speed and in reverse, the double-reversing bearing is used. The counter rotating bearing 8 is lubricated by filling the peripheral portion of the bearing 8 with lubricating oil 9.

The lubricating oil 9 is warmed by heating the counter-rotating bearing 8, but if the lubricating oil temperature rises and deteriorates, the lubricating performance deteriorates. Therefore, the lubricating oil temperature should be monitored. is necessary.

As a lubricating oil temperature monitoring means in a conventional counter-rotating propeller device, as shown in FIG. 4, a radial hole 10 is provided at a position near the counter-rotating bearing 8 of the hollow rear propeller shaft 1. Open, project the tip of the lead wire 11 passing through the inside of the rear propeller shaft 1 toward the counter-rotating bearing 8 side through the hole 10, attach the sensor 12 to the tip, and attach the other end of the lead wire 11 The end is connected to a slip ring or a telemeter so that the signal from the sensor 12 can be transmitted to the monitoring device.

[0007]

[Problems to be solved by the device]

 However, since the rear propeller shaft 1 supports the rear propeller 4 at the rear end in a cantilever shape, the maximum bending stress occurs, but after that, the middle position of the propeller shaft 1, that is, double inversion. Since the hole 10 is formed in the vicinity of the bearing 8, a crack is generated from the hole 10 1 as a starting point due to stress concentration, and the rear propeller shaft 1 may be broken.

Therefore, the present invention is intended to provide a contra-rotating propeller device which eliminates the risk of shaft breakage and allows the sensor to be installed in the vicinity of the contra-rotating bearing.

[0009]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention concentrically arranges a hollow front propeller shaft on the outer side of a hollow rear propeller shaft and fixes the rear propeller boss at the rear end of the rear propeller shaft. In the double reversing propeller device with the structure in which the front propeller boss is fixed to the rear end of the front propeller shaft, and the double reversing bearing is interposed between the inner peripheral surface of the front propeller boss and the outer peripheral surface of the rear propeller shaft. A hole is formed in the rear propeller boss, and a sensor at the tip of the lead wire passing through the hole of the rear propeller boss from the inside of the propeller shaft is positioned near the double reaction bearing. Further, the hole provided in the rear propeller boss may penetrate in the axial direction of the rear propeller boss, or may be communicated with the hole formed in the rear end portion of the rear propeller shaft. Further, a structure may be adopted in which a protective pipe is attached in advance to the path for guiding the lead wire, and the lead wire covered with a slippery material is inserted into the protective pipe.

[0010]

[Action]

 The lead wire that goes through the inside of the rear propeller shaft is passed through the hole provided in the rear propeller boss so that the sensor is placed near the counter-rotating bearing. There is no need to make holes in the position, and there is no risk of shaft breakage even if large bending stress occurs on the rear propeller shaft.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Like the one shown in FIG. 4, a front propeller shaft 2 having a hollow structure is provided outside a rear propeller shaft 1 having a hollow structure. Fitting and concentrically arranging with a space held between them, the rear propeller boss 3 is fitted and fixed to the rear end of the rear propeller shaft 1, and the front propeller boss 5 is attached to the rear end of the front propeller shaft 2. So that the rear propeller shaft 1 and the front propeller shaft 2 are rotated so that the rear propeller 4 and the front propeller 6 rotate in opposite directions, and the inner peripheral surface of the front propeller boss 5 and the rear propeller shaft 5 are rotated. In the counter-rotating propeller device having a structure in which the counter-rotating bearing 8 is interposed between the rear propeller boss 3 and the outer peripheral surface of the rear No. 1, a hole 13 penetrating in the axial direction is provided in the rear propeller boss 3, and The rear end of the rear propeller shaft 1 so as to communicate with the inside of the propeller shaft 1. A hole 1a is opened in the surface, a propeller cap 14 is attached to the rear end surface of the rear propeller boss 3, and a space 15 covered by the propeller cap 14 is used to make a hole 13 from the inside of the rear propeller shaft 1 to the rear propeller boss 3. The lead wire 11 can be guided to the lead wire 11, and the sensor 12 at the tip of the lead wire 11 is mounted in the vicinity of the counter rotating bearing 8. The temperature of the oil 9 is monitored by the sensor 12.

When the ship is propelled by rotating the rear propeller 4 and the front propeller 6 in the reverse direction, the counter-rotating bearing 8 between the front propeller boss 5 and the rear propeller shaft 1 and supporting the rotation of both is always lubricated. Lubricated at 9. This lubricating oil temperature is detected by a sensor 12 located in the vicinity of the counter rotating bearing 8, and its signal is taken out via a lead wire 11 and monitored by a monitoring device (not shown).

Further, since the rear propeller 4 is attached to the rear end portion of the rear propeller shaft 1, a large bending stress is generated in the rear propeller shaft 1 during operation, but the lead wire 11 has a rear propeller. From the inside of the shaft 1 through the space 15 in the propeller cap 14 to the hole 13 of the rear propeller boss 3, a radial hole is formed near the counter-rotating bearing 8 of the rear propeller shaft 1 as in the conventional example. Since it is not necessary to provide it, it is possible to prevent the rear propeller shaft 1 from being cracked.

Next, FIG. 2 shows another embodiment of the present invention. In FIG. 1, a propeller cap 14 is provided in FIG. 1, and a space of a rear propeller shaft 1 is passed through a space 15 to form a hole in the rear propeller boss 3. In order to guide the lead wire 11 to the vicinity of the counter-rotating bearing 8 from the inside of the rear propeller shaft 1 directly through the hole of the rear propeller boss 3 instead of the method of guiding the lead wire 11 to the rear propeller shaft 13. A radial hole 16 is provided at the rear end of the shaft 1, and a hole 17 is provided in the rear propeller boss 3 that communicates with the hole 16 and extends in the axial direction.

In this embodiment, the hole 16 is provided at the rear end position where the stress of the rear propeller shaft 1 is small and there is no risk of breakage, and it is communicated with the hole 17 of the rear propeller boss 3. Providing the propeller cap 14 as shown can be omitted.

FIG. 3 shows still another embodiment of the present invention. In the embodiment shown in FIG. 1, a protective pipe 18 is attached to a path for guiding the lead wire 11 in advance so as to draw a smooth curve. On the other hand, the lead wire 11 is covered with a slippery material such as Teflon tube and inserted into the protective pipe 18 from the end so that the sensor 12 is located in the vicinity of the counter rotating bearing 8. It was done.

According to this embodiment, there is an advantage that the sensor 12 can be easily replaced when it fails.

It should be noted that the sensor 12 in each of the above-described embodiments is not limited to the temperature sensitive element, but can be applied to a sound or vibration detecting element, and other various changes may be made without departing from the gist of the present invention. Of course, it can be added.

[0020]

[Effect of the device]

 As described above, according to the counter rotating propeller device of the present invention, the lead wire connected to the sensor for detecting the lubricating oil temperature of the counter rotating bearing interposed between the rear propeller shaft and the front propeller boss. Has a structure in which the sensor is installed near the counter-rotating bearing through the hole provided in the rear propeller boss after passing through the inside of the rear-propeller shaft. Since there is no hole in the rear propeller shaft near the bearing that may cause stress concentration, the risk of breakage of the rear propeller shaft can be prevented, and a protective pipe is installed in advance through the lead wire. By inserting the lead wire into the protective pipe, it is possible to obtain an excellent effect that the sensor can be easily replaced in the case of failure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a counter-rotating propeller device according to the present invention.

FIG. 2 is a sectional view of an essential part showing another embodiment of the counter-rotating propeller device of the present invention.

FIG. 3 is a sectional view of an essential part showing still another embodiment of the contra-rotating propeller device according to the present invention.

FIG. 4 is a cross-sectional view showing how to install a sensor in a conventional counter-rotating propeller device.

[Explanation of symbols]

 1 Rear Propeller Shaft 2 Front Propeller Shaft 3 Rear Propeller Boss 4 Rear Propeller 5 Front Propeller Boss 6 Front Propeller 8 Double Reversing Bearing 9 Lubricating Oil 11 Lead Wire 12 Sensor 13, 16, 17 Hole 18 Protective Pipe

Claims (2)

[Scope of utility model registration request] 1. A hollow front propeller shaft is concentrically arranged outside a hollow rear propeller shaft to fix a rear propeller boss to a rear end of the rear propeller shaft and a front end to a rear end of the front propeller shaft. In the counter-rotating propeller device with the propeller boss fixed, and the counter-rotating bearing interposed between the inner peripheral surface of the front propeller boss and the outer peripheral surface of the rear propeller shaft, attach the lead wire to the rear propeller boss. A hole for passage is formed, the lead wire led through the hole of the rear propeller boss via the inside of the rear propeller shaft is connected to the sensor, and the sensor is attached to a position near the counter-rotating bearing. Counter rotating propeller device. 2. The counter-rotating propeller device according to claim 1, wherein a protective pipe is previously attached to a path for guiding the lead wire, and the lead wire whose surface is covered with a slippery material is inserted into the protective pipe.