JPH0328639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating oil supply structure for supplying lubricating oil to bearings of inner and outer propeller shafts of a counter-rotating propeller device applied to a ship.

(Prior Art) Conventionally, general marine propulsion devices are composed of a propeller that generates thrust and a propeller shaft that transmits power to the propeller, and losses occur in the form of rotational energy in the wake of the propeller. However, there are two concentric
This loss can be recovered by placing two propellers one behind the other and reversing the rear propeller.

Based on the above theory, counter-rotating propeller devices have been proposed that have an inner propeller shaft concentrically arranged to rotate in a direction opposite to the hollow outer propeller shaft.

This counter-rotating propeller can be applied to ships to improve propeller cavitation performance, reduce vibrational force, reduce the load per propeller by sharing the load between two propellers, reduce the optimum propeller diameter, It is also attracting attention in the marine field due to its improved ship handling performance, increased propulsion efficiency, and lower noise.

(Problem to be solved by the invention) By the way, if two propellers are arranged concentrically,
In a counter-rotating propeller device that rotates each other, there are two propeller shafts, and the power transmission shaft is configured such that the inner propeller shaft passes through the hollow outer propeller shaft, so the inner propeller shaft is Support in most cases is required by bearings located in the outer propeller shaft or within the front propeller.

Therefore, since the inner and outer propeller shafts of the inner and outer propeller shaft bearings are reversed, their relative speed increases, and heat generation and lubrication problems become important.
Circulation that collects lubricating oil while supplying it is often required, and in order to circulate lubricating oil, a supply line and recovery (waste oil)
Two lines are inevitably required.

This invention was made in view of the above points, and utilizes the gap between the inner and outer propeller shafts to connect one of the supply line and recovery (waste oil) line for circulating lubricating oil, and the other By providing a lubricant inside the propeller shaft and improving the structure for supplying lubricating oil to the bearings of the inner propeller shaft, where it is particularly difficult to supply lubricating oil, this technology will greatly contribute to the practical application of counter-rotating propeller devices. The object of the present invention is to provide a lubricating oil supply structure for a counter-rotating propeller device.

(Means for Solving the Problems) The gist of the present invention for achieving the above object is that an inner In a marine counter-rotating propeller device having a propeller shaft and a bearing supporting the inner propeller shaft provided inside the outer propeller shaft or inside the front propeller, a lubricating oil passage for lubricating the bearing is provided.
An in-shaft passage provided in the axial direction inside the inner propeller shaft and opened to the shaft surface at the rearmost bearing part communicates with an off-axis passage formed in the gap between the outer propeller shaft and the inner propeller shaft. The present invention provides a lubricating oil supply structure for a contra-rotating marine propeller device, which is characterized by:

(Example) The drawings show an example of a power transmission structure of a counter-rotating propeller device to which the present invention is applied.

In the figure, 1 is the front propeller, 2 is the rear propeller, 3 is the hollow outer propeller shaft to which the front propeller 1 is attached, and 4 is the inner part which is arranged concentrically within the outer propeller shaft 3 and is the inner part to which the rear propeller 2 is attached. a propeller shaft, 5 a prime mover, 6 an output shaft 7 of the prime mover 5;
A gear device having a reversing function that connects the inner and outer propeller shafts 3 and 4. This gear device 6 is composed of a plurality of gears, and has an increasing and decelerating function in addition to the reversing function. 7 is transmitted to the inner and outer propeller shafts 3 and 4 via the joint part 8, and the propellers 1 and 2 are rotated in mutually opposite directions.

Thus, the outer propeller shaft 3 is incorporated into the stern tube 9 and supported by bearings 10 and 11 on the bow and stern sides, and the inner propeller shaft 4 disposed within the outer propeller shaft is supported by bearings on the bow and stern sides. It is supported by 12 and 13.

The front propeller 1 has a boss portion 1a attached to a flange 3a provided at the rear end of an outer propeller shaft 3, and the outer propeller shaft 3 is attached to the outer side of the gear device 6 in a double configuration at a joint portion 8. Output shaft 14
Furthermore, the inner propeller shaft 4 is flange-connected to the inner output shaft 15, respectively.

In this invention, an in-shaft passage 16a is provided as the lubricating oil passage 16 inside the inner propeller shaft 4, which extends in the axial direction and opens to the surface of the inner propeller shaft 4 behind the rear bearing 13, and this in-shaft passage 16a is connected to the outer propeller shaft. 3 and an off-axis passage 16b formed in the gap between the inner propeller shaft 4 and the inner propeller shaft 4.

On the other hand, the inner output shaft 15 of the gear device 6 is provided with two relay passages 17 and 18 passing through the shaft, and the rear end 17a of one of the passages is connected to the intra-shaft passage 16a at the joint part 8. The rear end 18a of the other passage is connected to the off-axis passage 16b through the flange joint.
Connect to.

A connecting device 19 for supplying and recovering lubricating oil from an external oil supply device is disposed at the front end of the output shaft on the bow end side of the gear device 6, and this connecting device 19 is provided on the inner output shaft 15. passage front end 17b
is connected to the head tank 21 of the external oil supply system via piping 20, and the other passage front end 18b is connected to piping 22.
It is connected to a sump tank 24 via a lubricating oil flow rate adjustment valve 23.

In addition, in the figure, 25 is a sealing device installed at an appropriate location, 2
6 is a lubricating oil pump, and 27 is an overflow pipe.

(Function) In the above configuration, lubricating oil is supplied via the pipe 20 from the head tank 21 constituting the external oil supply device, first from the connecting device 19 to the inner output shaft 1.
8, passes through the flange joint, passes through the shaft passage 16a in the inner propeller shaft 4, exits from the rear of the rear bearing 13 to the outside of the inner propeller shaft 4, and is formed between the inner and outer propeller shafts. Off-axis passage 1
6b, lubricates the rear bearing 13 to the front bearing 12, reaches the flange joint, and from there flows into the other relay passage 18 provided in the inner output shaft 15, and the oil that has passed through the relay passage 18 is Connection device 19
It flows down from the pipe 22 to the sump tank 24 .

The lubricating oil accumulated in the sump tank 24 is pumped up into the head tank 21 by the lubricating oil pump 26, and the lubricating effect is repeated again by the above-mentioned circulation effect.

In the above embodiment, of the two relay passages 17 and 18 provided through the inner output shaft 15, the passage front end 17b of the relay passage 17 is connected to the head tank 21 side of the external oil supply device via the piping 20. The front end 18b of the other relay passage 18 is connected to the sump tank 24 via a pipe 22, and the shaft passage 16a in the inner propeller shaft 4 is used as a supply line for circulating lubricating oil. , shows a lubricating oil supply system in which the off-axis passage 16b formed between the inner and outer propeller shafts is used as a collection (waste oil) line; A lubricating oil supply system may be used in which the outer passage 16b is used as a lubricating oil supply line, and the in-shaft passage 16a in the inner propeller shaft 4 is used as a recovery (waste oil) line.

In the embodiment, the lubricating oil is supplied by gravity from the head tank 21 of the external oil supply device, but the oil discharged from the lubricating oil pump 26 is directly supplied from the connecting device 19, and the recovered oil is Of course, it is also possible to adopt a lubricating oil supply system in which the lubricating oil is returned to the head tank 24.

(Effect) This invention is configured as described above,
The advantages of the lubricating oil supply structure of the present invention are as follows.

(1) Since the lubrication oil system is self-contained, it is not affected by the lubrication method of the outer propeller shaft bearing (usually using oil or seawater).

(2) A relay passage for lubricating oil is provided in the gear shaft of the gear device, which has a reversing function to transmit the output of the prime mover to the inner and outer propeller shafts, and can be completely separated from the lubrication system for the gear device to prevent mutual influence. does not affect

Therefore, even if seawater enters the lubricating oil supply system through the seawater seal provided between the front propeller and the rear propeller attached to the rear ends of the inner and outer propeller shafts, the damage will be localized. , and since there is a lubricating oil recovery line, it is easy to detect whether or not seawater has entered.

(3) By providing a connecting device for supplying and recovering lubricating oil on the bow end of the gear shaft of the gear device, it is not a strength member, so it can be made smaller and simpler.

[Brief explanation of drawings]

The drawing is an overall configuration diagram showing an embodiment of the present invention. 1...Front propeller, 2...Rear propeller, 3
...Outer propeller shaft, 4...Inner propeller shaft, 5
...Prime mover, 6...Gear device, 7...Output shaft, 8
...Joint part, 9... Stern tube, 10, 11... Bearing of outer propeller shaft, 12, 13... Bearing of inner propeller shaft, 14... Outer output shaft, 15... Inner output shaft, 16... Lubricating oil passage, 17, 18... Relay passage, 19... Connection device, 20... Piping, 21...
...head tank, 22 ... piping, 23 ... flow rate adjustment valve, 24 ... sump tank, 25 ... sealing device, 26 ... lubricating oil pump, 27 ... overflow pipe.

Claims (1)

[Claims] 1. An inner propeller shaft is arranged concentrically within a hollow outer propeller shaft so as to rotate in the opposite direction to the inner propeller shaft, and a bearing supporting the inner propeller shaft is located inside the outer propeller shaft, or In a marine counter-rotating propeller device installed in the front propeller, a lubricating oil passage for lubricating the above-mentioned bearings is provided inside the inner propeller shaft in the axial direction, and a lubricating oil passage is provided on the shaft surface at the rearmost bearing part. A lubricating oil supply structure for a counter-rotating marine propeller device, characterized in that an opened in-shaft passage communicates with an off-shaft passage formed in a gap between an outer propeller shaft and an inner propeller shaft. 2. The lubricating oil passage is connected to two relay passages provided inside the gear shaft of a gear device having a reversing mechanism that transmits power to the inner propeller shaft, and lubricating oil is supplied and recovered from an external oil supply device. The lubricating oil supply structure for a contra-rotating marine propeller device according to claim 1, characterized in that the lubricating oil is supplied from the bow side end of the gear device.