JPH0535598U - Shaft structure of marine counter-rotating propeller device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To improve the bearing of the outer shaft of a marine counter-rotating propeller device. [Structure] An assembly flange 8 attached to an output shaft 1a of an engine, an elastic joint 7 attached thereto, a front end portion thereof is connected by an elastic joint 7, and a hollow outer shaft 5 and a front end portion are output. In a marine counter-rotating propeller device that is connected to the shaft 1a and has an inner shaft 2 to which a rear propeller is attached, an input shaft 61 is connected to an output shaft 71 of an elastic joint 7 and an input shaft bearing 11 is provided. By arranging the output shaft of the elastic joint 7 near the front end portion of the output shaft 71, the span L ₀ can be set to a large value, and the input shaft 61 can be set even if the weight of the elastic joint 7 is applied to the output shaft 71. The tilting is prevented, and as a result, the reliability of the reversing gear device can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a contra-rotating propeller device for a ship, and more particularly to improvement of a bearing portion of its outer shaft.

[0002]

[Prior Art]

 It consists of a hollow outer shaft with a front propeller attached to the rear end, and an inner shaft with the rear propeller attached to the inner end of the outer shaft concentrically. A marine counter-rotating propeller device configured to rotate the inner shaft and the outer shaft in mutually opposite directions has been conventionally known.

An example thereof will be described with reference to FIGS. 2 and 3. In FIG. 2, reference numeral 1 indicates a main engine, and the rear propeller 3 is directly connected to the output shaft 1a of the main engine 1 via the inner shaft 2. While being connected so as to be driven, the outer shaft 5 and the front propeller 4 connected to the outer shaft 5 via the reversing gear device 6 are connected via an elastic joint 7 so as to rotate in the opposite direction to the main engine 1. It is connected to the output shaft 1a of the engine. The elastic joint 7 is provided to protect the tooth surface of the reversing gear device 6 from the fluctuation torque of the main engine 1.

As shown in FIG. 3, the front end portion of the inner shaft 2 is formed in a tapered shape and fits with the assembly flange 8. The assembly flange 8 is coupled with the output shaft 1a of the main engine 1 and the elastic joint body 7. To be done. Reference numeral 71 denotes an output shaft of the elastic joint, which is connected to the input shaft 61 of the reversing gear device 6. Reference numeral 61a indicates a sun gear integrally formed with the input shaft 61, and the sun gear 61a meshes with the planetary gear 63. The planetary gear 63 is supported by a planetary shaft 65 fixed to the casing 9, and an internal gear 64 is meshed with the planetary gear 65 so that the output shaft 67 rotates in the direction opposite to the main engine 1.

A pair of input shaft bearings 10 a and 10 b are arranged at a distance L ₂ to support the input shaft 61. Reference numeral 68 indicates an output shaft bearing, reference numeral 66 indicates a fixed ring, and a plurality of fixed rings fix the planetary shaft 65 and are also connected to an arm 69 fixed to the casing 9 to form a planetary gear 63. It functions to hold the position of.

Here, the weight of the elastic joint body 7 depends on the assembly flange 8 and the output shaft 71 of the elastic joint. On the other hand, since the sun gear 61a is mounted on the input shaft 61 of the reversing gear device coupled to the output shaft 71, the weight of the elastic joint body 7 causes the input shaft 61 to tilt and the tooth contact of the sun gear 61a to be reduced. A pair of input shaft bearings 10a and 10b are installed to prevent deterioration.

[0007]

[Problems to be solved by the device]

By the way, the above-mentioned conventional shaft structure of the marine counter-rotating propeller device has the following problems. (1) Since the weight of the elastic joint is considerably large, when supporting with _two bearings of the input shaft, the angle of inclination with the input shaft is too large and the bearing load is also increased unless the distance L ₂ between the input shaft bearings is increased. It gets bigger. (2) The meshing accuracy between the sun gear and the planetary gears, that is, the inclination angle of the input shaft bearing must be strictly controlled. If this accuracy is poor, it may cause damage to the planetary gears, and in the worst case, the reversing gear system cannot be used, resulting in a serious accident that renders the ship unable to navigate. However, it is difficult to fit the above-mentioned two input shaft bearings to the casing according to the design values and to check the mounting accuracy, which poses a serious accident risk. (3) Since the input shaft is equipped with two input shaft bearings, as a result, the total length L ₁ of the reversing gear device becomes large and the total length of the shaft system device also becomes long. In this case, it is necessary to take measures such as enlarging the engine room and reducing the cargo space, which impairs the economy of the ship. In addition, the weight of the reversing gear device itself increases and the cost also increases.

The present invention is intended to solve such a problem, in which the reversing gear device has only one input shaft bearing and the front end of the output shaft of the elastic joint in order to support the weight of the elastic joint. To provide a shaft structure of a double-reversal propeller device for a ship, in which a bearing is provided on the inner surface of the section, and the assembled flange is supported by the flange to increase the distance between both bearings and reduce the total length of the reversing gear device. With the goal.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the shaft structure of the contra-rotating propeller device for a ship according to the present invention comprises an assembly flange attached to an output shaft of an engine, an elastic joint attached to the assembly flange, and a front end portion of the elastic joint. And a hollow outer shaft having a front propeller attached to the rear end and a front end that is concentrically arranged inside the outer shaft and the front end of the engine. The output shaft is connected through the assembly flange and has an inner shaft with a rear propeller attached to the rear end, and the input shaft of the reversing gear device is connected to the output shaft of the elastic joint. An input shaft bearing capable of supporting the input shaft of the reversing gear device at its outer peripheral portion is provided, and a bearing capable of supporting the output shaft of the elastic joint at its inner peripheral portion on the assembly flange is at the front end of the output shaft. Located near the department It is characterized in that.

[0010]

[Action]

 In the shaft structure of the above-described marine counter-rotating propeller device according to the present invention, since the span of the bearing supporting the input shaft of the reversing gear device and the output shaft of the elastic joint can be made large, the inclination of the input shaft of the gear device Since the output shaft of the elastic joint and the assembly flange have the same rotation direction and number of rotations, the performance of the bearing installed on the inner surface of the output shaft of the elastic joint is not sufficient. The bearing is secured and there is no sliding part that supports the rotating shaft, so there is no risk of accidents such as seizure.

[0011]

【Example】

 Hereinafter, the shaft structure of a contra-rotating propeller device for a ship according to an embodiment of the present invention will be described with reference to the drawings. FIG. In FIG. 1, the same reference numerals as those in FIGS. 2 and 3 indicate almost the same members.

Also in this embodiment, a hollow outer shaft 5 having a front propeller attached to a rear end thereof, a hollow outer shaft 5 arranged concentrically with the outer shaft 5 and a rear propeller mounted at the rear end thereof. It has an outer shaft 2 attached thereto, and is configured so that the inner shaft 2 and the outer shaft 5 are rotationally driven in opposite directions.

That is, the front end taper portion of the inner shaft 2 having the rear propeller (not shown) attached to the rear end portion is fitted to the taper portion of the assembly flange 8, and the assembly flange 8 is attached to the output shaft of the main engine. 1a and the elastic joint body 7 are joined together. The output shaft 71 of the elastic joint is connected to the input shaft 61 of the reversing gear device 6, and the inner surface of the front end is supported by the assembly flange 8 via the bearing 10.

A planetary gear 63 is supported by a planetary shaft 65 whose one end is fixed to the casing 9. The planetary gear 63 is formed on the rear end of the input shaft 61, and the sun gear 61 a and the output shaft 67 of the reversing gear device 6 are supported. Meshes with the internal gear 64 formed at the front end of the internal gear 64, and the internal gear 64 is connected to the outer shaft 5 through the output shaft 67, and the front propeller (not shown) is in the opposite direction to the output shaft 1a of the main engine. It is configured to be driven to rotate.

A fixed ring 66 is attached to the shaft end of the planetary shaft 65, and the fixed ring 66 is supported by the casing 9 by an arm 69 to maintain the positional accuracy of the planetary gear 63. Reference numeral 11 indicates an input shaft bearing, which corresponds to the conventional input shaft bearings 10a and 10b.

Therefore, in the case of this embodiment, the output shaft 71 of the elastic joint and the input shaft 61 of the reversing gear device 6 are supported by the two bearings 10 and 11 arranged at the distance L _0. It will be. Since the distance L ₀ is much larger than the distance L _{2 in} the case of the conventional example (see FIG. 3), it becomes possible to accurately support the output shaft 71 and the input shaft 61, and as a result, the sun gear 61a and the planetary gears can be supported. It is possible to smoothly mesh with the gear 63.

Further, since the bearing 10 fixed to the output shaft 7 of the elastic joint rotates at the same rotational speed in the same direction as the assembly flange 8 on the side supporting the same, there is no sliding portion in the bearing 10. Therefore, an extremely simple and highly reliable bearing can be obtained.

Furthermore, since the input shaft 61 of the reversing gear device 5 is supported by one input shaft bearing 11, the total length of the reversing gear device 5 is L ′ _{1 in} the case of the conventional example (see FIG. 3). It is possible to shorten to L ₁ compared to ().

[0019]

[Effect of the device]

 As described above in detail, the shaft structure of the marine counter-rotating propeller device of the present invention provides the following effects and advantages. (1) Since the span between the input shaft bearing of the reversing gear device and the bearing on the inner surface of the output shaft of the elastic joint can be made large, even if the weight of the elastic joint is applied to the output shaft of the joint, the reversing gear device It is possible to suppress the inclination of the input shaft, that is, the deterioration of the tooth contact of the sun gear.

Therefore, the probability of an accident due to poor meshing of the planetary gears is greatly reduced, and the reliability of the reversing gear device is improved. (2) Since only one input shaft bearing is required for the reversing gear device, the total length of the gear device can be significantly shortened, which contributes to weight reduction and cost reduction of the reversing gear device. Further, the shortening of the entire shaft device facilitates the arrangement of the main engine.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a shaft structure of a contra-rotating propeller device for a ship according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a shaft structure of a conventional marine counter-rotating propeller device.

FIG. 3 is a sectional view of the same main part.

[Explanation of symbols]

 1a Output shaft of engine 2 Inner shaft 5 Outer shaft 6 Inversion gear device 7 Elastic joint 10 Bearing 11 Input shaft bearing 61 Input shaft of inversion gear device 71 Output shaft of elastic joint

Claims (1)

[Scope of utility model registration request] 1. A marine counter-rotating propeller device, wherein an assembly flange attached to an output shaft of an engine, an elastic joint attached to the assembly flange, and a front end portion are connected to the elastic joint via an inversion gear device. A hollow outer shaft having a front propeller attached to its rear end, and a hollow outer shaft concentrically arranged inside the outer shaft, and the front end being connected to the output shaft of the engine through the assembly flange. And an inner shaft with a rear propeller attached to the rear end,
While the input shaft of the reversing gear device is connected to the output shaft of the elastic joint, an input shaft bearing capable of supporting the input shaft of the reversing gear device at its outer peripheral portion is provided, and the output shaft of the elastic joint is A shaft structure of a contra-rotating propeller device for a ship, wherein a bearing capable of being pivotally supported by the assembly flange at an inner peripheral portion thereof is arranged near a front end portion of the output shaft.