A pre-rotation drive flexible shaft device for an autogyro

Abstract

This invention belongs to the field of rotorcraft technology, and particularly relates to a pre-rotation drive flexible shaft device for an autogyro. It includes: a central positioning shaft; an elastic layer assembly is sleeved on the outer side of the central positioning shaft, the elastic layer assembly being coaxially arranged with the central positioning shaft; and a sheath assembly is disposed on the outer side of the elastic layer assembly. The elastic layer assembly comprises a plurality of elastic layers arranged sequentially from the inside out, the plurality of elastic layers being coaxially arranged, with the elastic layer located at the inner edge being coaxially arranged with the central positioning shaft. In this invention, as the curvature and torque of the flexible shaft change, the elastic layers in the elastic layer assembly mutually support and restrict each other during deformation, thereby ensuring that the shaft of this invention has a large output torque range within a certain bending range.

Description

Technical Field

[0001] This invention belongs to the field of rotorcraft technology, and particularly relates to a pre-rotation drive flexible shaft device for autogyros. Background Technology

[0002] The pre-rotation drive flexible shaft of an autogyro is a drive device for pre-rotation of the autogyro before takeoff. The pre-rotation drive flexible shaft of an autogyro is generally divided into a bushing and a shaft.

[0003] In practical use, the turning radius and torque of the pre-rotation drive flexible shaft have a significant impact on the pre-rotation of the autogyro. When the turning radius and torque of the pre-rotation drive flexible shaft are small, the pre-selection time is longer, affecting the autogyro's takeoff time. Summary of the Invention

[0004] The purpose of this invention is to provide a pre-rotation drive flexible shaft device for autogyros to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A pre-rotation drive flexible shaft device for an autogyro includes: a central positioning shaft, an elastic layer assembly sleeved on the outer side of the central positioning shaft, the elastic layer assembly being coaxially arranged with the central positioning shaft, and a sheath assembly being provided on the outer side of the elastic layer assembly;

[0007] The elastic layer group includes several elastic layers arranged sequentially from the inside to the outside, and the elastic layers are arranged coaxially. The elastic layer located at the inner edge is arranged coaxially with the central positioning axis.

[0008] Preferably, the central positioning shaft includes several coaxially arranged multi-strand springs, and the several multi-strand springs have the same direction of rotation and are interlocked with each other.

[0009] Preferably, the sheath assembly includes an outer sleeve fitted over the outer side of the elastic layer located at the outer edge, the outer sleeve being coaxially disposed with the elastic layer.

[0010] Preferably, the outer sleeve includes a steel spring sleeve fitted outside the elastic layer located at the outer edge, a first rubber layer fitted outside the steel spring sleeve, a wire mesh layer fitted outside the first rubber layer, a second rubber layer fitted outside the wire mesh layer, and the steel spring sleeve is coaxially arranged with the elastic layer.

[0011] Preferably, a gap of 10-30 μm is left between two adjacent elastic layers.

[0012] Preferably, the elastic layer includes a plurality of coaxially arranged first springs, wherein the plurality of first springs have the same direction of rotation and are interlocked with each other.

[0013] Preferably, the rotation direction of the steel spring sleeve is the same as the rotation direction of the central positioning shaft.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects:

[0015] In this invention, as the bending and torque of the flexible shaft change, the elastic layers in the elastic layer group support and restrict each other during the deformation process, thereby ensuring that the shaft of this invention has a large output torque range within a certain bending range. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric view of the present invention;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 for Figure 2 BB section view in the middle;

[0020] Among them, 1. central positioning shaft; 2. elastic layer; 9. steel spring sleeve; 10. outer sleeve; 101. first rubber layer; 102. second rubber layer; 103. steel wire mesh layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figures 1 to 3 The present invention discloses a pre-rotation drive flexible shaft device for an autogyro, comprising: a central positioning shaft 1, an elastic layer assembly sleeved on the outer side of the central positioning shaft 1, the elastic layer assembly being coaxially arranged with the central positioning shaft 1, and a sheath assembly being provided on the outer side of the elastic layer assembly.

[0024] The scheme is further optimized so that the central positioning shaft 1 includes several coaxially arranged multi-strand springs, which have the same direction of rotation and are interlocked with each other.

[0025] The scheme is further optimized. The elastic layer group includes several elastic layers 2 arranged sequentially from the inside to the outside. The elastic layers 2 are arranged coaxially, and the elastic layer 2 located at the inner edge is arranged coaxially with the central positioning axis 1.

[0026] The design is further optimized by including an outer sleeve 10 that is fitted over the elastic layer 2 located at the outer edge, with the outer sleeve 10 coaxially arranged with the elastic layer 2. The outer sleeve 10 protects the drive flexible shaft, preventing damage to the elastic layer 2 inside the drive flexible shaft.

[0027] In a further optimized design, the outer casing 10 includes a steel spring sleeve 9 fitted over the elastic layer 2 located at the outer edge. A first rubber layer 101 is fitted over the outer side of the steel spring sleeve 9, a wire mesh layer 103 is fitted over the outer side of the first rubber layer 101, and a second rubber layer 102 is fitted over the outer side of the wire mesh layer 103. The steel spring sleeve 9 and the elastic layer 2 are coaxially arranged. There are two wire mesh layers 103. This arrangement strengthens the structural strength of the first rubber layer 101 and the second rubber layer 102, increasing their service life.

[0028] A further optimized design involves leaving a 10-30 μm gap between two adjacent elastic layers 2. This arrangement allows for relative movement between the two adjacent elastic layers 2, enabling the drive shaft of the device to bend.

[0029] A further optimized design includes several coaxially arranged first springs, all with the same direction of rotation and interlocking with each other. This arrangement increases the output torque range of the driving flexible shaft.

[0030] The scheme was further optimized so that the rotation direction of the steel spring sleeve 9 is the same as that of the central positioning shaft 1.

[0031] The steel spring sleeve 9 possesses both elasticity and a certain degree of rigidity, protecting the elastic layer 2 from damage. Lubricating oil is introduced between the steel spring sleeve 9 and the elastic layer 2, ensuring smoother bending of the drive shaft and extending its lifespan. The steel spring sleeve 9, the elastic layer 2, and the center positioning shaft 1 are all made of 304 stainless steel with a density of 8000 kg / m³. 3 The Poisson's ratio is 0.3, tensile strength is 630 MPa, yield strength is 290 MPa, elastic modulus is 190 GPa, and shear modulus is 75 GPa. The diameter of the drive flexible shaft is 14.85-15 mm, the length L = 1332 mm, the central positioning shaft 1 of the drive flexible shaft rotates counterclockwise, the bending diameter of the drive flexible shaft is 320-340 mm, and the cross-sectional area A = 176.6 mm².2 Polar moment of inertia Ip = 4967.6 mm 4 .

[0032] Performance parameters:

[0033] The maximum torque of the drive flexible shaft is 36.4 Nm.

[0034] Ultimate shear stress: 55.0 MPa;

[0035] Safety margin: 10.455;

[0036] Torsional deformation: 0.051 rad

[0037] Destructive torque: 147.583 NM

[0038] The torsional angle corresponding to the breaking torque is 159.989 degrees.

[0039] Referring to the table below, one embodiment of the elastic layer group in this application is shown:

[0040]

[0041]

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A pre-rotation drive flexible shaft device for an autogyro, characterized in that, include: A central positioning shaft (1) is provided with an elastic layer assembly on its outer side. The elastic layer assembly is coaxially arranged with the central positioning shaft (1). A sheath assembly is provided on the outer side of the elastic layer assembly. The elastic layer group includes a plurality of elastic layers (2) arranged sequentially from the inside to the outside, the plurality of elastic layers (2) being arranged coaxially, and the elastic layers (2) being arranged coaxially with the central positioning axis (1); The central positioning shaft (1) includes several coaxially arranged multi-strand springs, and the several multi-strand springs have the same direction of rotation and are interlocked with each other; The sheath assembly includes an outer sleeve (10) fitted over the outer side of the elastic layer (2) located at the outer edge, the outer sleeve (10) being coaxially arranged with the elastic layer (2); The outer sleeve (10) includes a steel spring sleeve (9) sleeved on the outside of the elastic layer (2) located at the outer edge. A first rubber layer (101) is sleeved on the outside of the steel spring sleeve (9). A wire mesh layer (103) is sleeved on the outside of the first rubber layer (101). A second rubber layer (102) is sleeved on the outside of the wire mesh layer (103). The steel spring sleeve (9) is coaxially arranged with the elastic layer (2). The elastic layer (2) includes several coaxially arranged first springs, which have the same direction of rotation and are interlocked with each other.

2. The pre-rotation drive flexible shaft device for an autogyro according to claim 1, characterized in that: A gap of 10-30 μm is left between two adjacent elastic layers (2).

3. The pre-rotation drive flexible shaft device for an autogyro according to claim 1, characterized in that: The rotation direction of the steel spring sleeve (9) is the same as that of the central positioning shaft (1).

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