Anti-clamping stagnation gear transmission device and anti-clamping stagnation method thereof

Abstract

The invention belongs to the technical field of helicopter tilting actuation system design, and particularly relates to an anti-clamping stagnation gear transmission device and an anti-clamping stagnation method thereof. The device comprises a flexible gear, a left side plate, a right side plate, a locking nut, a first lining, a transmission shaft and a second lining, a first flange is arranged on the edge of a spline in the left side plate, and a fan-shaped groove and a second flange are formed in the outer side of the left side plate; a third flange is arranged on the outer side of the right side plate internal spline; an outer spline is arranged on the transmission shaft; the flexible gear is sleeved in the left side plate and the right side plate, an axial boss extends out of the left side of the flexible gear in the circumferential direction, and the axial boss is matched with the fan-shaped groove to transmit torque; the spline tooth top of the transmission shaft is sleeved with the second bush, the outer circle of the second bush is clamped by the first turned edge of the left side plate, and the transmission shaft is sleeved with the first bush which is located between the transmission shaft blocking shoulder and the right side plate. The flexible gear, the left side plate and the right side plate are installed on the transmission shaft through the locking nut and the lining.

Description

Technical Field

[0001] The present invention belongs to the technical field of helicopter tilt actuation system design, and particularly relates to an anti-stall gear transmission device and an anti-stall method thereof. Background Art

[0002] The reliability requirements for the tilt actuation system of a tilt-rotor helicopter are extremely high. When the tilt actuation system, a key component of the tilt-rotor helicopter, fails due to gear jamming, the helicopter is at risk of crashing. Therefore, in order to improve the reliability of the gear transmission of the tilt actuation system, it is necessary to design an anti-stall gear transmission device to reduce the possibility of failure due to foreign object jamming in the gear transmission. Summary of the Invention

[0003] Object of the Invention: To provide an anti-stall gear transmission device and an anti-stall method thereof to improve reliability.

[0004] Technical Solution:

[0005] An anti-stall gear transmission device includes: a flexible gear, a left side plate, a right side plate, a locking nut, a first bushing, a transmission shaft, and a second bushing. The flexible gear is an annular hollow gear; the left side plate is an annular structure with internal splines provided on the inner side, a first flanging provided at the edge of the splines, a fan-shaped groove and a second flanging provided on the outer side; the right side plate is an annular structure with internal splines provided on the inner side and a third flanging provided on the outer side; external splines are provided on the transmission shaft; the flexible gear is sleeved inside the left side plate and the right side plate, and the rim of the flexible gear is in interference fit with the second flanging of the left side plate and the third flanging of the right side plate. The left side plate and the right side plate are in clearance fit with both sides of the flexible gear to prevent the flexible gear from being clamped by the left side plate and the right side plate. At the same time, the left side plate and the right side plate provide axial positioning for the flexible gear. An axial boss extends circumferentially on the left side of the flexible gear, and the axial boss cooperates with the fan-shaped groove to transmit torque; the second bushing is sleeved on the spline tooth top of the transmission shaft and the outer circle of the second bushing is clamped by the first flanging of the left side plate. The first bushing is sleeved on the transmission shaft and is located between the shoulder of the transmission shaft and the right side plate; the locking nut and the bushing install the flexible gear, the left side plate, and the right side plate on the transmission shaft for axial positioning and fastening.

[0006] Further, there are multiple fan-shaped grooves and they are evenly distributed circumferentially.

[0007] Further, the thickness of the rim of the flexible gear is less than the height of one tooth.

[0008] Further, the second bushing is in interference fit or transition fit with the spline tooth top of the transmission shaft, and the outer circle of the second bushing is in interference fit or transition fit with the first flanging of the left side plate.

[0009] Further, the axial boss and the fan-shaped groove are in small clearance fit.

[0010] Further, the radial depth of the fan-shaped groove on the left side plate is less than the maximum radial deformation of the flexible gear.

[0011] Further, a fourth flanging is also provided at the edge of the spline on the right side plate for further clamping the outer circle of the second bushing.

[0012] An anti-sticking method, which is implemented by means of the above anti-sticking gear transmission device, the method includes:

[0013] When the flexible gear transmits power, the radial load generated by the meshing force of the gear is transmitted from the flexible gear to the left side plate and the right side plate through interference fit; the left side plate and the right side plate are connected to the transmission shaft through splines, and the meshing force of the gear is transmitted to the second bushing through the fan-shaped groove on the left side plate, and then transmitted to the transmission shaft through the spline tooth top of the transmission shaft; the torque input to the gear is transmitted to the left side plate through the boss and the fan-shaped groove, and then transmitted to the transmission shaft through the splines of the side plate;

[0014] When a hard block is stuck in the middle of the tooth groove, by increasing the torque input to the gear, the gear generates a large radial load, causing the flexible gear to deform radially, and then making the gear drive pass through the gear meshing point with the hard block, avoiding the gear drive from being stuck by the hard block, so as to improve the reliability of the transmission system.

[0015] Beneficial effects:

[0016] An anti-sticking gear transmission device of the present invention improves the reliability and safety of the tilt actuation system. Its structure is simple and compact, lightweight, safe and reliable. The present invention is applicable to the tilt actuation system of a helicopter. Description of the drawings

[0017] Figure 1 It is a schematic diagram of an anti-sticking gear transmission device according to an embodiment of the present invention;

[0018] Figure 2 It is a sectional view taken along the AA line of Figure 1 ;

[0019] Figure 3 It is a structural diagram of the left side plate;

[0020] Figure 4 It is a structural diagram of one side of the right side plate;

[0021] Figure 5 It is another structural diagram of the right side plate;

[0022] Figure 6 It is a structural diagram of the flexible gear;

[0023] Figure 7 It is a structural diagram of the transmission shaft.

[0024] Among them, there are flexible gear 1, left side plate 2, right side plate 3, locking nut 4, first bushing 5, transmission shaft 6, second bushing 7, spline 8, first flanging 9, second flanging 10, third flanging 11, and fourth flanging 12. Specific implementation manner

[0025] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the implementation manners of this application will be described in more detail below with reference to the accompanying drawings in the implementation manners of this application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described implementation manners are part of the implementation manners of this application, rather than all of the implementation manners. The implementation manners described below by referring to the drawings are exemplary and are intended to explain this application, and should not be construed as a limitation of this application. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application. The implementation manners of this application will be described in detail below with reference to the drawings.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "axial direction", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the protection scope of the present invention.

[0027] A kind of anti-sticking gear transmission device provided by this invention of the invention improves the reliability and safety of the tilt actuation system. Its structure is concise and practical, light in weight, safe and reliable. This invention is applicable to the tilt actuation system of helicopters.

[0028] Such as Figure 1-7, an anti-stalling gear transmission device, comprising a flexible gear 1, a left side plate 2, a right side plate 3, a lock nut 4, a first bushing 5, a transmission shaft 6, and a second bushing 7. The flexible gear 1 is an annular hollow gear with a thin rim thickness (the rim thickness is less than one tooth height). The flexible gear 1 is sleeved inside the left side plate 2 and the right side plate 3, and the rim of the flexible gear 1 is in interference fit with the second flanging 10 of the left side plate 2 and the third flanging 11 of the right side plate 3. The left side plate 2 and the right side plate 3 are in clearance fit with both sides of the flexible gear 4. At the same time, the left side plate 2 and the right side plate 3 provide axial positioning for the flexible gear 1. When the gear transmits power, the radial load generated by the meshing force of the gear is transmitted from the flexible gear 1 to the second flanging 11 of the left side plate 2 and the third flanging 11 of the right side plate 3 through interference fit; the left side plate 2 and the right side plate 3 are connected to the transmission shaft 6 through a spline 8. The inner hole edge of the left side plate 2 is designed with a first flanging 9. The second bushing 7 is installed inside the first flanging 9 of the left side plate 2. At the same time, the second bushing 7 is in small clearance fit with the tooth top of the external spline of the transmission shaft 6. The meshing force of the gear is transmitted to the second bushing 7 through the first flanging 9 of the left side plate 2, and then transmitted to the transmission shaft 6 through the tooth top of the spline of the transmission shaft 6; the left circumferential direction of the flexible gear 1 extends an axial boss, which is stuck in multiple sector-shaped grooves in the circumferential direction of the left side plate 2 and is in small clearance fit. The torque input to the flexible gear 1 is transmitted to the left side plate 2 through the boss and the sector-shaped grooves, and then transmitted to the transmission shaft 6 through the spline 8 of the left side plate 2; when a hard block is stuck in the tooth groove, by increasing the torque input to the flexible gear 1, the flexible gear 1 generates a large radial load, causing the flexible gear 1 to deform radially. Furthermore, the flexible gear 1 drives the hard block to pass through the gear meshing point together, avoiding gear transmission being stuck due to the hard block and improving the reliability of the transmission system. The card slot of the left side plate 2 has a certain depth, which plays a role in stopping the boss of the flexible gear 1 and preventing the flexible gear 1 from breaking due to excessive deformation; the flexible gear 1, the left side plate 2, and the right side plate 3 are installed on the transmission shaft 6 through the lock nut 4 and the first bushing 5 for axial positioning and fastening.

[0029] In this kind of device, the flexible gear 1 is sleeved inside the flanges of the left side plate 2 and the right side plate 3, and is in interference fit with the outer flanges of the left side plate 2 and the right side plate 3 to transmit the radial force generated by gear meshing. When the gear is running normally, the generated radial load is small and not enough to deform the flexible gear 1. When there is a hard block in the middle of the gear tooth groove, the input torque is increased to make the gear generate a large radial load, and the flexible gear 1 deforms. Then, the gear drive drives the hard block through the gear meshing point together, avoiding the gear drive being stuck by the hard block and improving the reliability of the drive system; the radial load of the flexible gear 1 is transmitted to the second bushing 7 through the first flange 9 of the left side plate 2, and then through the cooperation of the spline on the tooth tip of the transmission shaft, it is transmitted to the transmission shaft 6, avoiding the spline 8 from bearing the radial load, reducing the wear of the spline 8, and improving the service life of the spline 8; the protruding platform extended from the flexible gear 1 transmits the torque of the gear, and the left side plate 2 transmits it to the transmission shaft 6 through the spline 8. Its structure is concise, compact and practical, adapting to a highly reliable drive system. The present invention is applicable to the helicopter tilt actuation system.

[0030] Key points of the present invention:

[0031] 1) The flexible gear 1 adopts a thin web structure, which is convenient for the radial deformation of the gear;

[0032] 2) The flexible gear 1 is sleeved inside the flanges of the left side plate 2 and the right side plate 3, and is in interference fit with the second flange 10 of the left side plate 2 and the third flange 11 of the right side plate 3 to transmit the radial force generated by gear meshing. When there is a hard block stuck in the middle of the gear tooth groove, the flexible gear 1 deforms radially. Then, the gear drive drives the hard block through the gear meshing point together, avoiding the gear drive being stuck by the hard block and improving the reliability of the drive system;

[0033] 3) The flexible gear 1 has an axial convex platform protruding in the circumferential direction on the left side, which is stuck in the sector groove in the circumferential direction of the left side plate 2 with a small clearance fit. The torque input to the gear is transmitted to the left side plate 2 through the convex platform and the sector groove, and then transmitted to the transmission shaft 6 through the spline 8 of the left side plate 2;

[0034] 4) The first flange 9 of the left side plate 2 is in interference fit with the second bushing 7, and the radial load of the gear is transmitted to the second bushing 7 through the first flange 9 of the left side plate 2;

[0035] 5) The second bushing 7 and the spline tooth tip of the transmission shaft 6 have a small clearance fit. The radial load of the gear is transmitted from the second bushing 7 to the spline tooth tip of the transmission shaft 6, avoiding the side of the spline 8 from bearing the radial load, reducing the wear of the spline 8, and improving the service life of the spline 8;

[0036] 6) The axial convex platform extended from the flexible gear 1 transmits the torque of the gear to the left side plate 2. The inner hole of the left side plate 2 is designed with an internal spline. The left side plate 2 is connected to the transmission shaft 6 through the spline 8, and the torque of the gear is transmitted to the transmission shaft 6 through the spline 8;

[0037] 7) The sector-shaped groove of the left side plate 2 has a certain depth, which functions to stop the boss of the flexible gear 1 and prevent the flexible gear 1 from breaking due to excessive deformation;

[0038] 8) The flexible gear 4, the left side plate 2 and the right side plate 3 are installed on the transmission shaft 6 through the lock nut 4 and the bushing 5 for axial positioning and fastening;

[0039] 9) The present invention is applicable to the helicopter tilt actuation system.

[0040] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An anti-stalling gear transmission device, characterized in that Comprising: A flexible gear, a left side plate, a right side plate, a lock nut, a first bushing, a transmission shaft, and a second bushing, wherein, The flexible gear is an annular hollow gear; the left side plate is an annular structure, with internal splines provided on the inner side, a first flanging provided at the edge of the splines, a sector-shaped groove and a second flanging provided on the outer side; the right side plate is an annular structure, with internal splines provided on the inner side and a third flanging provided on the outer side; external splines are provided on the transmission shaft; the flexible gear is sleeved inside the left side plate and the right side plate, and the rim of the flexible gear is in interference fit with the second flanging of the left side plate and the third flanging of the right side plate. The left side plate and the right side plate are in clearance fit with both sides of the flexible gear to prevent the flexible gear from being clamped by the left side plate and the right side plate. At the same time, the left side plate and the right side plate provide axial positioning for the flexible gear. An axial boss extends circumferentially from the left side of the flexible gear, and the axial boss cooperates with the sector-shaped groove to transmit torque; the second bushing is sleeved on the spline tooth top of the transmission shaft, and the outer circle of the second bushing is clamped by the first flanging of the left side plate. The first bushing is sleeved on the transmission shaft and is located between the shoulder of the transmission shaft and the right side plate; the lock nut and the bushing mount the flexible gear, the left side plate, and the right side plate on the transmission shaft for axial positioning and fastening.

2. The anti-stall gear transmission device according to claim 1, characterized in that, There are multiple sector-shaped grooves and they are evenly distributed circumferentially.

3. The anti-stalling gear transmission device according to claim 1, wherein, The thickness of the rim of the flexible gear is less than the height of one tooth.

4. The anti-stalling gear transmission device according to claim 1, characterized in that, The second bushing is in interference fit or transition fit with the spline tooth top of the transmission shaft, and the outer circle of the second bushing is in interference fit or transition fit with the first flanging of the left side plate.

5. The anti-stalling gear transmission device according to claim 1, characterized in that, The axial boss is in small clearance fit with the sector-shaped groove.

6. The anti-stall gear transmission device according to claim 1, characterized in that, The radial depth of the sector-shaped groove on the left side plate is less than the maximum radial deformation of the flexible gear.

7. The anti-stall gear transmission device according to claim 1, characterized in that, A fourth flanging is further provided at the edge of the splines of the right side plate for further clamping the outer circle of the second bushing.

8. A method for preventing jamming, characterized in that, The method is executed by means of the anti-sticking gear transmission device according to any one of claims 1-7. The method includes: When the flexible gear transmits power, the radial load generated by the meshing force of the gear is transmitted from the flexible gear to the left side plate and the right side plate through interference fit; the left side plate and the right side plate are connected to the transmission shaft through splines. The meshing force of the gear is transmitted to the second bushing through the sector-shaped groove of the left side plate, and then transmitted to the transmission shaft through the spline tooth top of the transmission shaft; the torque input to the gear is transmitted to the left side plate through the boss and the sector-shaped groove, and then transmitted to the transmission shaft through the splines of the side plate. When a hard block gets stuck in the tooth groove, by increasing the torque input to the gear, the gear generates a large radial load, causing the flexible gear to deform radially, and then causing the gear transmission to drive the hard block through the gear meshing point together, avoiding gear transmission jamming due to the hard block and improving the reliability of the transmission system.

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