Rotor shaft assembly of rotorcraft

Abstract

The utility model discloses a rotor shaft assembly of a rotorcraft in the technical field of rotorcrafts, which comprises a propeller disc assembly sleeved on the top of a rotor shaft, the propeller disc assembly comprises an anti-torsion arm support and a central propeller disc, the anti-torsion arm support is arranged below the central propeller disc and is fixedly connected with the rotor shaft through a fastener, and the central propeller disc is fixedly connected with the rotor shaft through the fastener. The center propeller disc is connected with the rotor shaft through a spline, the top of the rotor shaft is further in threaded connection with a locking nut, the locking nut presses the center propeller disc on the anti-torsion arm support, the problem that in the prior art, due to the connection mode of the rotor shaft and the propeller disc assembly, the rotation precision is insufficient is solved, and the rotor disc assembly can be used for a rotorcraft.

Description

Technical Field

[0001] The utility model relates to the technical field of rotorcraft, in particular to a rotor shaft of a rotorcraft. Background Art

[0002] The rotor shaft assembly is the main power component of the rotorcraft, which is used to transmit the power of the engine to the blades and drive the blades to rotate. Figure 4 As shown, the rotor shaft 100 assembly in the prior art includes a blade disk assembly 200 mounted on the top of the rotor shaft 100. The rotor shaft 100 and the blade disk assembly 200 are connected by two 90° crossed bolts 301. In addition, the blade disk assembly 200 integrates an anti-torsion arm support and a center blade disk, and is processed in an integrated manner. Its shortcomings are: its structure is relatively complex and the processing difficulty is relatively high; in addition, the rotor shaft and the blade disk assembly are connected by two bolts because they are generally free tolerances, and the accuracy of synchronous rotation is slightly insufficient. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a rotor shaft assembly for a rotorcraft, which solves the problem of insufficient rotation accuracy caused by the connection method between the rotor shaft and the propeller disc assembly in the prior art.

[0004] The purpose of the utility model is achieved as follows: a rotor shaft assembly of a rotorcraft, including a propeller disc assembly mounted on the top of the rotor shaft, the propeller disc assembly including an anti-torsion arm support and a central propeller disc, the anti-torsion arm support is arranged below the central propeller disc, the anti-torsion arm support is fixedly connected to the rotor shaft by a fastener, the central propeller disc is connected to the rotor shaft by a spline, and the top of the rotor shaft is also threadedly connected with a locking nut, which presses the central propeller disc onto the anti-torsion arm support.

[0005] Furthermore, a threaded hole is provided on the top of the rotor shaft.

[0006] Furthermore, a locking washer is provided between the locking nut and the central propeller disc.

[0007] Furthermore, the fastener includes a bolt, a nut and a bushing. The bolt connects the anti-torsion arm support and the rotor shaft in series and is fixed with the nut. The bushing is arranged between the bolt and the anti-torsion arm support.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts a split structural design for the anti-torsion arm support and the center blade disc, which reduces the difficulty in manufacturing and processing compared to the previous integral structure, and also facilitates disassembly and installation during maintenance and repair; the connection method between the rotor shaft and the center blade disc is changed from two 90° cross bolt connections to a spline engagement connection, which greatly improves the accuracy of the synchronous rotation between the rotor shaft and the center blade disc; lifting threaded holes are added to improve the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Figure 2 It is a partial cross-sectional view of the utility model.

[0012] Figure 3 It is a partial exploded view of the utility model.

[0013] Figure 4 It is a schematic diagram of the structure of a rotor shaft assembly in the prior art.

[0014] Among them, 100 rotor shaft, 200 propeller disc assembly, 201 anti-torsion arm support, 202 center propeller disc, 300 fasteners, 301 bolts, 302 nuts, 303 bushings, 304 cotter pins, 400 locking nuts, 500 locking washers, 600 lifting ears, and 700 head screws. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1-3 A rotorcraft rotor shaft assembly shown in the figure includes a propeller disk assembly 200 mounted on the top of the rotor shaft 100, the propeller disk assembly 200 includes an anti-torsion arm support 201 and a central propeller disk 202, the anti-torsion arm support 201 is arranged below the central propeller disk 202, the anti-torsion arm support 201 is fixedly connected to the rotor shaft 100 through a fastener 300, the central propeller disk 202 is connected to the rotor shaft 100 through a spline, and the top of the rotor shaft 100 is also threadedly connected with a locking nut 400, which presses the central propeller disk 202 onto the anti-torsion arm support 201.

[0017] Specifically, a spline groove is processed on the outer periphery of the top end of the rotor shaft 100, and the center of the center blade disk 202 is correspondingly processed into a spline sleeve. A through hole that cooperates with the fastener 300 is provided on the rotor shaft 100 below the spline groove.

[0018] During assembly, first insert the anti-torsion arm support 201 from the top of the rotor shaft 100, connect and fix it with the rotor shaft 100 through the fastener 300, and then insert the center blade disc 202 into the rotor shaft 100 to complete the spline engagement. The lower end face of the center blade disc 202 fits tightly with the upper end face of the anti-torsion arm support 201, and finally tighten and fix it with the locking nut 400.

[0019] The utility model adopts a split structural design for the anti-torsion arm support 201 and the central blade disc 202, which reduces the difficulty in manufacturing and processing compared with the previous integral structure, and also facilitates disassembly and installation during maintenance and repair; the connection method between the rotor shaft 100 and the central blade disc 202 is changed from two 90° crossed bolts 301 to a spline meshing connection, which greatly improves the accuracy of the synchronous rotation between the rotor shaft 100 and the central blade disc 202.

[0020] Furthermore, a threaded hole is formed on the top of the rotor shaft 100 .

[0021] Specifically, the lifting ear 600 and the head screw 700 can be screwed into the threaded hole.

[0022] It should be noted that there is a lifting ring threaded hole at the top of the rotor shaft 100. During the assembly and transportation process, the lifting ring can be installed to facilitate lifting; when lifting is not required, the lifting ring is removed and replaced with the head screw 700.

[0023] Furthermore, a locking washer 500 is provided between the locking nut 400 and the central paddle disc 202 .

[0024] It should be noted that the provision of the locking washer 500 enhances the stability of the locking nut 400 when it is locked.

[0025] Furthermore, the fastener 300 includes a bolt 301 , a nut 302 and a bushing 303 . The bolt 301 connects the anti-torsion arm support 201 and the rotor shaft 100 in series and is fixed with the nut 302 . The bushing 303 is arranged between the bolt 301 and the anti-torsion arm support 201 .

[0026] Specifically, a split pin 304 is used during fixation to increase reliability.

[0027] The above embodiments are only used to help understand the method and core idea of ​​the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A rotor shaft assembly for a rotorcraft, comprising a propeller disc assembly (200) mounted on the top of a rotor shaft (100), characterized in that: The propeller disc assembly (200) comprises an anti-torsion arm support (201) and a central propeller disc (202); the anti-torsion arm support (201) is arranged below the central propeller disc (202); the anti-torsion arm support (201) is fixedly connected to the rotor shaft (100) via a fastener (300); the central propeller disc (202) and the rotor shaft (100) are connected via a spline; a locking nut (400) is also threadedly connected to the top of the rotor shaft (100); the locking nut (400) presses the central propeller disc (202) onto the anti-torsion arm support (201).

2. A rotorcraft rotor shaft assembly according to claim 1, characterized in that: A threaded hole is provided on the top of the rotor shaft (100).

3. A rotorcraft rotor shaft assembly according to claim 1 or 2, characterized in that: A locking washer (500) is also provided between the locking nut (400) and the central paddle disc (202).

4. A rotorcraft rotor shaft assembly according to claim 1 or 2, characterized in that: The fastener (300) comprises a bolt (301), a nut (302) and a bushing (303); the bolt (301) connects the anti-torsion arm support (201) and the rotor shaft (100) in series and is fixed together with the nut (302); the bushing (303) is arranged between the bolt (301) and the anti-torsion arm support (201).

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