[0029] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.
[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other directions or The positional relationship is based on the position or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a limitation to the present invention.
[0031] Such as figure 1 As shown, the soft locking device for the main rotor of the rotating wing aircraft in this embodiment includes a restraining component, a frictional deceleration component, an elastic compression component and a braking component.
[0032] The restraint assembly includes a lower fixing seat 8 fixed on the main rotor shaft, an upper locking sleeve 5 sleeved on the main rotor shaft, and an elastic part between the main rotor shaft and the upper locking sleeve.
[0033] The elastic component adopts a torsion spring or a coil spring, one end is connected to the upper locking sleeve 5, and the other end is connected to the lower fixing seat 8 or the main rotor shaft 1. When the lower fixing seat 8 rotates with the main rotor shaft 1, the upper locking sleeve 5 can be driven to rotate synchronously by the elastic member.
[0034] The upper locking sleeve 5 has a structure that cooperates with the braking component, and can stop rotating under the action of the braking component; in this embodiment, the structure of the upper locking sleeve that cooperates with the braking component is a shaft on the wall of the upper locking sleeve. In this embodiment, the brake component adopts a push rod driven by a steering gear, and the root of the push rod has a spring. When the steering gear receives an instruction to drive the push rod to perform the braking movement, the steering gear executes the movement setting stroke of the component , Make the head of the push rod contact the wall of the upper locking sleeve, and compress the spring, and the axial position of the contact part is within the axial range of the axial strip hole on the wall of the upper locking sleeve; when the upper locking sleeve 5 rotates to the axial direction After the position of the strip hole coincides with the head of the push rod, the push rod continues to be driven by the root spring to be inserted into the axial strip hole on the wall surface of the upper locking sleeve, so that the upper locking sleeve 5 stops rotating. At this time, the depth of the push rod inserted into the axial strip hole of the upper locking sleeve wall surface driven by the root spring can be limited by design, so that the head of the push rod does not contact the surface of the main rotor shaft, and avoids directly inserting the main rotor shaft at this time. Or by matching the width of the axial strip hole on the main rotor shaft with the size of the push rod head, so that when the push rod is inserted into the axial strip hole on the wall of the upper locking sleeve, the upper lock When the sleeve 5 stops rotating, the main rotor shaft has rotated relative to the upper locking sleeve. At this time, the push rod has not been inserted into the axial strip hole on the main rotor shaft, but is in contact with the main rotor shaft surface.
[0035] When the upper locking sleeve stops rotating and the lower fixing seat continues to rotate forward with the main rotor shaft, the lower fixing seat can drive the upper locking sleeve to move axially along the main rotor shaft. In this embodiment, it is realized by the way of matching the spiral slope of the upper end of the lower fixing seat 8 and the lower end of the upper locking sleeve 5. In addition, the elastic component located between the lower fixing seat and the upper locking sleeve will generate a certain resistance to the rotation movement of the main rotor shaft.
[0036] The friction reduction assembly includes an upper friction disc 3 and a lower friction disc 9 sleeved on the main rotor shaft. The upper friction disc 3 is sleeved on the main rotor shaft 1 through the one-way bearing 2. When the main rotor shaft 1 rotates in the forward direction, the one-way bearing 2 can drive the upper friction disc 3 to rotate, and when the main rotor shaft 1 rotates in the reverse direction , The upper friction disk 3 does not hinder the reverse rotation of the main rotor shaft 1.
[0037] The lower section of the lower friction disc 9 has a cylindrical sleeve structure; the cylindrical sleeve structure is coaxially nested and fitted with the upper locking sleeve 5, the side wall of the cylindrical sleeve structure has an axial strip hole, and the upper locking sleeve 5 has a wall surface A sliding pin is fixed, and the sliding pin is matched with the axial bar hole of the lower friction disc 9, which can prevent the lower friction disc 9 and the upper locking sleeve 5 from rotating relative to each other, and the lower friction disc 9 can be within the setting range relative to the upper locking sleeve 5 Axial movement.
[0038] The elastic compression component is sleeved on the cylindrical sleeve structure of the lower friction disc, and the two ends are respectively connected to the back of the lower friction disc and the end surface of the upper locking sleeve; when the upper locking sleeve 5 is driven by the lower fixing seat 8 to move along the axis of the main rotor, it can Driven by the elastic compression component, the lower friction disc surface is in contact with the upper friction disc surface, and as the upper locking sleeve 5 rises, the greater the pressure of the elastic compression component, the greater the rotation resistance of the main rotor shaft generated by the friction reduction assembly, which can Decelerate the main rotor shaft faster to a stop.
[0039] Here we limit the axial change size of the elastic compression component from the free state to the minimum incompressible state not to be greater than the maximum axial rise distance of the upper locking sleeve; this ensures that the upper locking sleeve can be raised to the highest position. Provide maximum pressure to the friction deceleration assembly to stop the main rotor.
[0040] When the main rotor shaft stops rotating in the forward direction, the elastic part between the lower fixing seat and the upper locking sleeve will generate a driving torque to make the main rotor shaft move in the reverse direction, and the elastic compression part sleeved on the cylindrical sleeve structure of the lower friction disc will also The pressure on the upper locking sleeve 5 will then use the spiral slope to generate the driving torque to move the main rotor shaft in the reverse direction; since the upper friction disc 3 is sleeved on the main rotor shaft 1 through the one-way bearing 2, the friction will not The main rotor shaft is prevented from being reversed, so under the action of the driving torque of the reverse motion, the main rotor shaft will rotate in the reverse direction.
[0041] The main rotor shaft has a structure that cooperates with the brake component; in this embodiment, the main rotor shaft has a structure that cooperates with the brake component on the axial strip hole on the wall of the main rotor shaft, and is used as a locking sleeve When it is attached to the lower fixing seat, the axial strip hole on the wall surface of the upper locking sleeve coincides with the axial strip hole on the main rotor shaft wall surface in the circumferential direction, and at least partially overlaps in the axial direction. In this way, when the main rotor shaft rotates in the reverse direction to make the upper locking sleeve fit the lower fixing seat, the push rod will continue to be driven by the root spring to be inserted into the axial strip hole on the main rotor shaft wall, and the main rotor shaft is locked at the designated position.
[0042] In this embodiment, the elastic compression component adopts a compression spring or a rubber spring; and the friction component of the lower friction disc and the upper friction disc adopts a disc type asbestos fiber friction disc, a semi-metal friction disc or a carbon fiber friction disc.
[0043] The main idea of the soft locking device for the main rotor of the rotating wing aircraft proposed in the present invention is to extend the time from the start of the rotor lock to the stop of rotation by the relative sliding between the upper locking sleeve and the lower fixing sleeve fixed on the main rotor shaft , In order to reduce the impact load, and the rotation resistance of the rotor after starting to lock increases as the rotation angle between the upper locking sleeve and the lower fixing sleeve increases, which converts the mechanical energy of the rotor rotation into other forms of energy dissipation; The direction of resistance of the rotor rotation is controllable, and the main rotor will not receive the resistance of the friction disc when the main rotor stops rotating and is pulled back to the set lock position. And although the time from the beginning of the rotor lock to the stop of the rotation is extended, the total time from the unloading of the rotor to the stop of the rotation is greatly shortened for the entire transition flight phase.
[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art will not depart from the principle and purpose of the present invention. Under the circumstances, changes, modifications, substitutions and modifications can be made to the above-mentioned embodiments within the scope of the present invention.
