Reverse transmission preventing mechanism for steel cable transmission

Abstract

The utility model belongs to the technical field of mechanical transmission, and particularly relates to a steel cable transmission reverse transmission preventing mechanism. The mechanism comprises a support assembly (2), a roller (9), a bracket (10) and a trapezoidal threaded rod (11), wherein the rolling wheel (9) is rotationally installed in the support (10), the rolling wheel (9) is provided with an internal thread and is provided with a trapezoidal threaded rod (11) in a matched mode, the side edge of the support (10) is hinged to the support assembly (2) through the rotating shaft bolt assembly (3), and a steel cable (102) loop is laid on the outer side of the rolling wheel (9); the support assembly (2) is fixed on a fixed structural member (104), the steel cable (102) is connected with a control device, a rocker arm (111) is hinged to the end of the trapezoidal threaded rod (11), and the other end of the rocker arm (111) is connected with a driven control surface (108) through an adjustable pull rod (109). By means of the reverse self-locking characteristic of the trapezoidal screw pair, the reverse transmission prevention function of the steel cable transmission line system actuating mechanism is achieved.

Description

Technical Field

[0001] The present application belongs to the field of mechanical transmission technology, and in particular relates to a steel cable transmission anti-backward transmission mechanism. Background Art

[0002] The control system of light general-purpose aircraft usually uses a soft control system composed of steel cables, pulleys, supports, etc. The pilot issues control instructions through the displacement of the operating device, and the mechanical motion power (force and displacement) is transmitted through the soft control system composed of steel cables, pulleys, supports, etc., thereby driving the control surface to deflect around the set rotation axis; some large transport aircraft also often use soft control systems composed of steel cables, pulleys, supports, etc. to transmit the pilot's displacement control instructions, output displacement, and realize the opening and closing control of the actuator slide valve; in addition, some large transport production lines also involve the need to realize the transmission of mechanical motion power (force and displacement) through soft control systems composed of steel cables, pulleys, supports, etc.

[0003] In order to meet the transmission requirements of the mechanical motion power (force and displacement) of the aircraft's control system, the soft control system composed of steel cables, pulleys, supports, actuators, etc. must meet three requirements: First, the power transmission requirement: the control system (including the soft transmission line system and actuator composed of steel cables, pulleys, and supports) should meet the force transmission requirement, that is, from the operating device to the steel cable and pulley transmission assembly, to the actuator at the end of the transmission rod system, the strength design should meet the load-bearing requirements, and the actuator should meet the stroke requirements; second, it should adapt to the installation space layout requirements on the aircraft; third, the transmission line system and actuator should have good maintenance and repairability (including disassembly, installation maintenance, lubrication maintenance, etc.) and long life.

[0004] The solution to the traditional soft control system is: the cockpit operating devices use control sticks (plates), pedals, hand wheels, knobs, etc. The driver issues control force and displacement instructions through the operating devices, and the control force and displacement are transmitted to the multi-stage pulley transmission assembly composed of steel cables, pulleys, and supports through the sprocket mechanism, driving the fan-shaped wheel actuator to rotate around the fixed rotating shaft, and the torsion tube rocker arm assembly fixed to the fan-shaped wheel drives the pull rod, thereby driving the control surface to deflect around the axis.

[0005] The traditional torsion bar solution has the following problems: First, the fan-shaped wheel actuating mechanism integrates a torsion tube rocker arm assembly, which is relatively difficult to install and arrange on the aircraft and has poor maintainability; second, the actuating mechanism at the end of the soft control system does not have a self-locking function. For an unassisted, reversible soft control system, when the pilot controls the control surface to a certain deflection, the pilot needs to continuously maintain the control force and displacement to maintain the current deflection position; once the rod is released, the control surface cannot be maintained at the current deflection position; third, because the fan-shaped wheel actuating mechanism does not have a reverse self-locking function, the force from the control surface (including the control surface's own weight torque, aerodynamic load, etc.) when the aircraft is flying in the air will be transmitted back to the operating device through the fan-shaped wheel actuating mechanism and then to the aircraft pilot, which undoubtedly increases the burden on the aircraft pilot. Utility Model Content

[0006] In order to solve at least one of the above technical problems, the present application designs a cable transmission anti-backward transmission mechanism to overcome the disadvantages of the traditional soft control system fan-type wheel actuator mechanism being relatively difficult to install and arrange on the machine, having poor maintainability, and lacking a reverse self-locking function.

[0007] The cable transmission anti-backward transmission mechanism provided in this application mainly includes a support assembly, a roller, a bracket and a trapezoidal threaded rod;

[0008] The roller is rotatably mounted in the bracket. The roller has an internal thread and is adapted to be mounted on a trapezoidal threaded rod. The side of the bracket is hinged to the support assembly through a rotating shaft bolt assembly. A steel cable loop is laid on the outside of the roller.

[0009] The support assembly is fixed on the fixed structure, the steel cable is connected to the control device, the end of the trapezoidal threaded rod is hinged with a rocker arm, and the other end of the rocker arm is connected to the driven control surface through an adjustable pull rod.

[0010] Preferably, the support assembly includes a base plate and two ears located on both sides of the base plate, the two ears are processed with through holes and installed with bushings to connect the shaft bolt assembly, and the base plate is fixed to the fixed structure by a support plate nut.

[0011] Preferably, a through hole for installing the shaft bolt assembly is provided on the side of the bracket. After the shaft bolt assembly passes through the through hole, it further passes through the ear hole of the support assembly, and a sleeve is provided between the sleeve and the bushing in the ear hole of the support assembly.

[0012] Preferably, the sleeve is machined from Q235 bar material.

[0013] Preferably, the inner holes at both ends of the roller are machined with steps to accommodate the installation of the shaft sleeve end covers, and the two shaft sleeve end covers are fixed to the upper and lower surfaces of the bracket by screw assemblies on the upper and lower sides of the bracket.

[0014] Preferably, a panel is provided between the shaft sleeve end cover and the bracket.

[0015] Preferably, the outer contour of the roller is processed with two annular steps, two planes symmetrical along the axis are processed between the two annular steps, and a through groove parallel to the axis is processed between the two annular steps. The size of the through groove is consistent with the steel cable. After fixing the steel cable, the steel cable is wrapped between the two annular steps.

[0016] Preferably, the through groove and the plane of the outer contour of the roller are spaced 90 degrees apart along the circumference of the roller.

[0017] Preferably, the trapezoidal threaded rod includes a fork ear section, a polished rod section, a trapezoidal external thread section and a fixed external thread section along the axial direction. The trapezoidal external thread section is threadedly connected to the roller in the bracket, the fork ear section is hinged to the rocker arm at the upper end of the outer side of the bracket, and the fixed external thread section is threadedly connected to the fastener after passing through the end cover at the lower end of the outer side of the bracket. The step at the connection between the polished rod section and the fork ear section provides an axial movement limit for the trapezoidal threaded rod on the upper side of the bracket, and the end cover provides an axial movement limit for the trapezoidal threaded rod on the lower side of the bracket.

[0018] Preferably, 7254 extreme pressure grease is applied between the roller and the trapezoidal threaded rod.

[0019] The present application has the advantages of good manufacturing processability, good installation and disassembly maintenance, long service life and low use cost. The present application utilizes the reverse self-locking characteristics of the trapezoidal spiral pair to realize the anti-reverse transmission function of the cable transmission line actuation mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural explosion diagram of a preferred embodiment of the cable transmission anti-backward transmission mechanism of the present application.

[0021] Figure 2 For this application Figure 1 Front view of the assembly of the anti-backflow mechanism of the illustrated embodiment.

[0022] Figure 3 For this application Figure 2 AA cross-sectional view of the embodiment shown.

[0023] Figure 4 For this application Figure 2 BB cross-sectional view of the embodiment shown.

[0024] Figure 5 For this application Figure 1 Schematic diagram of the anti-backward transmission mechanism in the embodiment shown.

[0025] Among them, 1-screw assembly, 2-support assembly, 3-rotating shaft bolt assembly, 4-sleeve, 5-sleeve end cover, 6-end cover, 7-fastener, 8-panel, 9-roller, 10-bracket, 11-trapezoidal threaded rod;

[0026] 101- Anti-backward transmission mechanism, 102- Steel cable, 103- Pulley bracket assembly, 104- Fixed structure, 105- Hexagon head screw, 106- Rocker arm shaft bolt assembly, 107- Articulated bolt assembly, 108- Control surface, 109- Adjustable pull rod, 110- Articulated bolt assembly, 111- Rocker arm, 112- Articulated bolt assembly. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0028] The present application provides a cable transmission anti-backward transmission mechanism, which can be used as the terminal actuator of the soft control system, receives the forward or reverse motion from the cable loop of the soft transmission line, drives the roller to rotate around the axis, and then outputs the displacement along the axis through the trapezoidal thread rod of the trapezoidal screw pair, and adjusts the movement direction and transmission ratio through the rocker arm, pull rod and other transmission components, thereby driving the control surface to deflect around its rotation axis. The following is a detailed description.

[0029] like Figure 1-Figure 5 As shown, the cable transmission anti-backward transmission mechanism of the present application mainly includes a support assembly 2, a roller 9, a bracket 10 and a trapezoidal threaded rod 11;

[0030] The roller 9 is rotatably mounted in the bracket 10. The roller 9 has an internal thread and is adapted to be mounted on a trapezoidal threaded rod 11. The side of the bracket 10 is hinged to the support assembly 2 through a rotating shaft bolt assembly 3. A steel cable 102 loop is laid on the outside of the roller 9.

[0031] The support assembly 2 is fixed on the fixed structure 104 , the steel cable 102 is connected to the control device, the end of the trapezoidal threaded rod 11 is hinged with a rocker arm 111 , and the other end of the rocker arm 111 is connected to the driven control surface 108 through an adjustable pull rod 109 .

[0032] In this embodiment, reference Figure 1 The trapezoidal screw pair is composed of a roller 9 with a trapezoidal internal thread and a trapezoidal threaded rod 11 with a trapezoidal external thread. The trapezoidal screw pair and the bracket 10 are combined into a whole through fasteners, and then hingedly mounted on the support assembly 2 through two sets of rotating shaft bolt assemblies 3 with their axes in the same straight line, forming a cable transmission anti-backward transmission mechanism. Figure 5 When the support assembly 2 is installed on the fixed structure 104, the cable transmission anti-backward transmission mechanism of the present application is actually equivalent to forming a two-force component. One of the two-force component elements is the rotation secondary axis of the side hole of the bracket 10 and the rotating shaft bolt assembly 3, and the second element of the two-force component is the screw fork ear axis of the trapezoidal helical pair. When the steel cable 102 loop wound on the roller 9 inputs a push or pull motion, causing the roller 9 to rotate around the trapezoidal helical pair axis, the cable transmission anti-backward transmission mechanism of the present application deflects and swings around the rotation secondary axis, and the screw of the trapezoidal helical pair extends or retracts along the axis, driving the rocker arm 111 at the rear of the trapezoidal threaded rod 11 to move around the fixed rotating shaft, and is transmitted through the adjustable pull rod 109 to drive the control surface 108 to deflect around its fixed rotating shaft.

[0033] In some optional embodiments, the support assembly 2 includes a base plate and two ears located on both sides of the base plate. Through holes are machined on the two ears and bushings are installed to connect the shaft bolt assembly 3. The base plate is fixed to the fixed structure 104 through a support plate nut.

[0034] In this embodiment, the support assembly 2 is a combination of an ear support, 4 sets of support plate nuts, and 2 bushings. Among them, the ear support is made of LY12 plate with a thickness of 3mm and then bent and machined to form the base plate and two ears on both sides of the base plate. The support plate nut is made of 4A1-49-5 standard parts, and the bushing is made of QAL10-3-1.5-Y-φ15 aluminum bronze rod machined parts. The 4 sets of support plate nuts are evenly distributed, and each is fixed to the inner side of the ear support base plate by two standard rivets of 4A1-114-118-2.6×6 specifications, forming the installation interface of the M5 screw assembly between the support assembly 2 and the fixed structural member 104. The M5 screw assembly here can refer to Figure 5 The hexagon head screw 105 shown. Two bushings are installed in the through holes of the ear pieces. The two through holes of the two ear pieces are located in the same axial direction. The shoulder surfaces of the bushings are respectively fitted with the inner surface of one side of the through holes of the ear pieces. The outer cylindrical surface of the bushings and the through holes on the ear pieces are assembled with a φ12H8 / x8 interference fit. After that, the axes of the two bushings are in a straight line, forming the rotating shaft of the ear hole of the support assembly, which is used to install the rotating shaft bolt assembly 3 to rotate the connecting bracket 10.

[0035] It should be noted that the reference Figure 1, four φ5 through holes are set on the bottom plate of the ear support, and the M5 internal threaded holes of the four groups of support plate nuts are coaxial with the four φ5 through holes on the bottom plate. When the support assembly 2 is installed, the bottom plate of the ear support is fitted with the plane of the fixed structure 104 and is installed by four groups of M5 screws; in addition, the outer cylindrical surface of the bushing and the hole on the ear support are assembled with φ12H8 / x8 interference fit, and then the inner hole of the bushing is machined to φ9H9, and the coaxiality of the inner holes of the two bushings is φ0.1mm.

[0036] In some optional embodiments, a through hole for installing the rotating shaft bolt assembly 3 is provided on the side of the bracket 10. After the rotating shaft bolt assembly 3 passes through the through hole, it further passes through the ear hole of the support assembly 2, and a sleeve 4 is provided between the sleeve and the bushing in the ear hole of the support assembly 2.

[0037] In some optional embodiments, the sleeve 4 is machined from Q235 rod.

[0038] First, the bracket 10 will be described. Figure 1 The bracket 10 is made of T7250 aluminum alloy pre-stretched plate machine. The main body size of the bracket 10 is a rectangular parallelepiped of 48×24×49mm. A 30×42mm through hole is opened in the middle of the side, and the inner side is rounded R5. Among them, a 5×10mm slot is opened outward in the middle position of the side height direction and on both sides of the length direction, a φ6H8 through hole is processed with the center point of the side as the axis, and a hole with a diameter of φ15 and a depth of 1mm is processed with the center point of the side as the axis on the side end face. The M6 ​​hexagonal head bolt of the shaft bolt assembly 3 passes through the φ6H8 through hole and the bolt head of the hexagonal head bolt is sunk into the 5×10mm slot, forming a φ6H8 / f7 clearance fit, which serves as the hinged shaft between the bracket 10 and the support assembly 2; a φ20H9 through hole is opened at the center position of the upper and lower panels of the bracket, and an M5-5H internal threaded hole with a depth of 12mm is processed along the width center line of the panel to form a φ20H9 / h9 clearance fit between the bracket 10 and the outer cylindrical surface of the panel 8 and the sleeve end cover 5, and is connected by 4 groups of M5 screw assemblies.

[0039] refer to Figure 1 or Figure 3, after the screw portion of the shaft bolt assembly 3 passes through the φ6H8 through-hole on the side of the bracket 10 from the inside to the outside, it further passes through the ear through-hole of the support assembly 2, and the sleeve 4 is installed between the bushing of the ear through-hole of the support assembly 2. The sleeve 4 is made of Q235 bar material and machined. Among them, the outer diameter of the sleeve 4 is φ9h9. When the bracket 10 and the support assembly 2 are hingedly installed, a φ9H9 / h9 clearance fit is formed between the outer cylindrical surface of the sleeve 4 and the shoulder bushing of the ear support; the inner hole size of the sleeve 4 is φ6H8 and the light rod of the shaft bolt assembly 4 forms a φ6H8 / f7 clearance fit; when the trapezoidal screw pair is combined with the bracket 10, it is hingedly installed on the support assembly 2 as a whole through the above two groups of shaft bolt assemblies 3, and the inner hole of the sleeve 4 and the bolt light rod of the shaft bolt assembly 3 are φ6H The 8 / f7 clearance fit constitutes a revolving pair, and the wear area is limited to the inner hole surface of the sleeve 4 and the cylindrical surface of the bolt polished rod. Since the sleeve material is Q235 and the standard bolt material is 30CrMnSiA, both have good wear resistance, and it is possible to avoid directly setting the revolving pair on the bolt polished rod of the bracket 10 and the rotating shaft bolt assembly 3. Since the bolt material 30CrMnSiA has much better wear resistance than the bracket material T7450, which causes the disadvantage of bracket hole wear, thereby improving the product service life and saving usage costs.

[0040] refer to Figure 1 Bracket 10 is laterally connected to support assembly 2 via shaft bolt assembly 3. A trapezoidal screw pair is mounted along the upper and lower axes. This pair comprises a roller 9 with a trapezoidal internal thread and a trapezoidal threaded rod 11 with a trapezoidal external thread. The roller 9 is machined from 30CrMnSiA rod with a diameter of φ32; the rod is machined from 30CrMnSiA rod with a diameter of φ16. The dimensions of the trapezoidal screw pair are Tr16×2-7e / 7H. The axial dimensions of the roller 9's internal trapezoidal thread are consistent with those of the inner bore, while the dimensions of the rod's trapezoidal external thread are consistent with those of the trapezoidal screw pair.

[0041] In some optional embodiments, the inner holes at both ends of the roller 9 are machined with steps to accommodate the installation of the sleeve end covers 5 , and the two sleeve end covers 5 are fixed to the upper and lower surfaces of the bracket 10 by screw assemblies 1 on the upper and lower sides of the bracket 10 .

[0042] refer to Figure 3 and Figure 4, coaxial stepped holes with a diameter of φ20H9 and a depth of 4mm are set at both ends of the inner hole of the roller 9 to form a φ20H9 / h9 clearance fit with the outer circle of the sleeve end cover 5. The shaft sleeve end cover 5 is made of T7250 aluminum alloy pre-stretched plate machined parts, with a middle portion perpendicular to the axis and a thickness of 3mm, and outer cylindrical surfaces of φ20h9 in diameter and 4mm and 9mm in height at both ends. Two φ5 through holes are processed on the 3mm thick flat plate. The positions of the φ20h9 through hole and the two φ5 through holes are respectively coordinated with the positions of the φ20H9 through holes and the M5-5H internal threaded holes on the upper and lower panels of the bracket; the coaxial inner hole of the shaft sleeve end cover and the φ20h9 is a φ16 through hole. When the bracket 10 is assembled, the flat plate of the shaft sleeve end cover 5 fits with the end cover, and the φ20h9 outer cylindrical surface forms a φ20H9 / h9 clearance fit with the bracket. The end face of the φ20h9 outer cylindrical surface of the shaft sleeve end cover with a height of 9mm fits with the end face of the roller of the trapezoidal spiral pair, and is connected by 4 sets of M5 screw assemblies.

[0043] In some optional embodiments, a panel 8 is disposed between the sleeve end cap 5 and the bracket 10. In this embodiment, the panel 8 is machined from LY12 sheet metal with a thickness of 0.5 mm. The panel includes a φ20H9 through-hole and two φ5 through-holes, the positions of which align with the φ20H9 through-holes and M5-5H internal threaded holes in the upper and lower panels of the bracket 10, respectively. When the bracket 10 is assembled, the panel 8 is positioned between the upper and lower surfaces of the bracket 10 and the sleeve end cap 5. The φ20H9 through-holes form a φ20H9 / h9 clearance fit with the φ20h9 outer surface of the sleeve end cap.

[0044] In some optional embodiments, the outer contour of the roller 9 is machined with two annular steps, two planes symmetrically along the axis are machined between the two annular steps, and a through groove parallel to the axis is machined between the two annular steps. The through groove has the same size as the steel cable 102. After the steel cable 102 is fixed, the steel cable 102 is wound between the two annular steps. In some optional embodiments, the through groove and the plane of the outer contour of the roller 9 are separated by 90 degrees along the circumference of the roller 9.

[0045] refer to Figure 1 、 Figure 3 and Figure 4 The outer contour of the roller 9 is divided into three sections along the axial direction by two bosses with a diameter of φ28.2 and a thickness of 2.5. The two ends are φ24 outer cylindrical surfaces. The φ25.2 cylindrical surface between the two bosses is milled into two planes symmetrical from the axis 12, and a through groove with a width of 1.8mm is opened at a distance of 10.4mm from the axis at a 90° angle to the plane for laying a cable loop for a φ1.8mm diameter steel cable on the roller 9.

[0046] In an alternative embodiment, while maintaining the main structure of the cable transmission anti-backward transmission mechanism of the present application unchanged, the trapezoidal spiral pair is slightly modified, a sprocket is processed on the outer cylindrical surface of the roller 9, and the cable segment wrapped around the roller is replaced by a chain. The sprocket and chain drive input the push-pull displacement and force along the chain loop to form a new actuating mechanism to realize the transmission anti-backward transmission function.

[0047] In some optional embodiments, the trapezoidal threaded rod 11 includes a fork ear section, a smooth rod section, a trapezoidal external thread section and a fixed external thread section along the axial direction. The trapezoidal external thread section is threadedly connected to the roller 9 in the bracket 10, the fork ear section is hinged to the rocker arm 111 at the upper end of the outer side of the bracket 10, and the fixed external thread section is threadedly connected to the fastener 7 after passing through the end cover 6 at the lower end of the outer side of the bracket 10. The step at the connection between the smooth rod section and the fork ear section provides an axial movement limit for the trapezoidal threaded rod 11 on the upper side of the bracket 10, and the end cover 6 provides an axial movement limit for the trapezoidal threaded rod 11 on the lower side of the bracket 10.

[0048] In this embodiment, the trapezoidal threaded rod 11 is composed of a fork ear section, a φ16 polished rod section, a Tr16×2-7e trapezoidal external thread section and a fixed external thread section, an M8 external thread section, in the axial direction. The fork ear section is used to connect output transmission components such as rocker arms and pull rods; the fixed external thread section is an M8 external thread, which is used to fix the screw of the trapezoidal screw pair to the end cover 6, and together with the φ16 polished rod section, serves as a screw limit travel limit device.

[0049] The end cover 6 is made of LY12 sheet material and is machined. It has an outer diameter of φ25, a thickness of 5.5mm, a coaxial inner hole of φ8, and a coaxial blind hole of φ16.1 and a depth of 4mm on one side. When the bracket 10 is assembled with the trapezoidal screw pair, the M8 external thread of the trapezoidal thread rod 11 passes through the φ8 inner hole of the end cover 6, and the step surface of the φ16.1 blind hole fits with the end face of the trapezoidal external thread section of the trapezoidal thread rod 11, and is fixedly connected by fasteners. The end cover 6 serves as a screw limit travel limit device.

[0050] The horizontal tail trim control system of a certain type of general light aircraft adopts a soft control system type, such as Figure 5 As shown, it consists of a steel cable 102, a pulley bracket assembly 103, an anti-backward transmission mechanism 101 provided in this application, a fixed structure 104, a hexagon head screw 105, a rocker arm shaft bolt assembly 106, a hinge bolt assembly 107 / 110 / 112, a rocker arm 111, an adjustable pull rod 109, a control surface 108, etc.

[0051] Among them, the rocker arm shaft bolt assembly 106 includes a hexagonal head bolt, a washer, a hexagonal slot nut, and a cotter pin. The hinge bolt assemblies 107 / 110 / 112 each include a hexagonal head bolt, a washer, a hexagonal slot nut, and a cotter pin. The control surface 108 is, for example, a horizontal tail adjustment plate control surface.

[0052] The anti-backward transmission mechanism 101 of the present application is installed on the fixed structure 104 by four hexagon head screws 105, and serves as the rear-end actuating mechanism of the soft control system composed of the steel cable 102, the pulley bracket assembly 103, etc., receiving the push or pull motion (force and displacement) of the steel cable loop around the roller 9, and outputting the trapezoidal threaded rod 11 to extend or retract in a straight line along its axial direction, driving the rear rocker arm 111 to move around the fixed rotating shaft, and transmitting through the adjustable pull rod 109, thereby driving the control surface 108 to deflect around its fixed rotating shaft.

[0053] Among them, one or more pulley bracket assemblies of the soft control system are set up to adapt the control system line system to the layout on the aircraft; the diameter specification of the steel cable 102 is selected as φ1.8mm, and the length is determined according to the actual layout on the aircraft; the rocker arm 111 adopts a triangular rocker arm type, and its input and output arm lengths are set to adjust the transmission ratio of the transmission rod system; the earring bolt end of the adjustable pull rod 109 is set to be adjustable in length, and the initial length of the adjustable pull rod 109 is adjusted to ensure the initial zero position requirement of the horizontal tail adjustment plate.

[0054] It should be noted that when the control system wiring is arranged, the center plane of the pulley bracket assembly 103 at the input end should coincide with the center plane of the roller 9 of the cable transmission anti-backward transmission mechanism provided in this application along the axial direction, so that the cable 108 wrapped around the roller 9 moves within the center plane of the roller along the axial direction, ensuring the smooth movement of the anti-backward transmission mechanism 101; in the soft control system, the cable transmission anti-backward transmission mechanism provided in this application is installed and disassembled as a whole as a separate LRU, and the anti-backward transmission function of the control system is realized through the self-locking performance of the trapezoidal screw pair itself, that is, the cable loop output push or pull movement can only be driven by actively manipulating the operating device of the horizontal tail adjustment plate control system, and the horizontal tail adjustment plate control surface is driven to deflect through the anti-backward transmission mechanism, rocker arm, and pull rod transmission assembly; when the operating device of the horizontal tail adjustment plate control system is not actively manipulated, the force and displacement from the horizontal tail adjustment plate control surface cannot be transmitted to the transmission assembly and operating device at the front of the anti-backward transmission mechanism.

[0055] In some optional embodiments, 7254 extreme pressure grease is applied between the roller 9 and the trapezoidal threaded rod 11 .

[0056] In this embodiment, the trapezoidal screw pair requires lubrication maintenance. This is accomplished by applying 7254 extreme pressure grease to the exposed roller portion of the screw rod of the trapezoidal screw pair with a brush. The operating components of the horizontal tail tab control system are then actively manipulated repeatedly under no-load conditions. This typically requires 3 to 5 cycles, driving the transmission line system and control surface deflection within the full range of travel to achieve lubrication of the trapezoidal screw pair.

[0057] This application utilizes the reverse self-locking properties of a trapezoidal helical pair to prevent reverse transmission in a cable-driven actuation mechanism, demonstrating high engineering application value. It can be used as an actuation mechanism for cable-driven systems in large-scale production lines, and is particularly suitable for use in auxiliary control systems (such as horizontal tail and rudder trim tab control systems) on light general-purpose aircraft.

[0058] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A cable transmission anti-backward transmission mechanism, characterized in that: It comprises a support assembly (2), a roller (9), a bracket (10) and a trapezoidal threaded rod (11); The roller (9) is rotatably mounted in the bracket (10), the roller (9) has an internal thread, and is adapted to be mounted on a trapezoidal threaded rod (11), the side of the bracket (10) is hinged to the support assembly (2) through a rotating shaft bolt assembly (3), and a steel cable (102) loop is laid on the outside of the roller (9); The support assembly (2) is fixed on the fixed structure (104), the steel cable (102) is connected to the control device, the end of the trapezoidal threaded rod (11) is hinged with a rocker arm (111), and the other end of the rocker arm (111) is connected to the driven control surface (108) through an adjustable pull rod (109).

2. The cable transmission anti-backward transmission mechanism according to claim 1, characterized in that: The support assembly (2) includes a base plate and two ear pieces located on both sides of the base plate. Through holes are machined on the two ear pieces and bushings are installed to connect the rotating shaft bolt assembly (3). The base plate is fixed to the fixed structure (104) through a supporting plate nut.

3. The cable transmission anti-backward transmission mechanism according to claim 2, characterized in that: The side of the bracket (10) is provided with a through hole for installing the rotating shaft bolt assembly (3). After the rotating shaft bolt assembly (3) passes through the through hole, it further passes through the ear plate through hole of the support assembly (2), and a sleeve (4) is provided between the sleeve and the bushing in the ear plate through hole of the support assembly (2).

4. The cable transmission anti-backward transmission mechanism according to claim 3, characterized in that: The sleeve (4) is machined from a Q235 bar.

5. The cable transmission anti-backward transmission mechanism according to claim 1, characterized in that: The inner holes at both ends of the roller (9) are machined with steps to accommodate the installation of the shaft sleeve end covers (5). The two shaft sleeve end covers (5) are fixed to the upper and lower surfaces of the bracket (10) via screw assemblies (1) on the upper and lower sides of the bracket (10).

6. The cable transmission anti-backward transmission mechanism according to claim 5, characterized in that: A panel (8) is provided between the shaft sleeve end cover (5) and the bracket (10).

7. The cable transmission anti-backward transmission mechanism according to claim 1, characterized in that: The outer contour of the roller (9) is processed with two annular steps, two planes symmetrical along the axis are processed between the two annular steps, and a through groove parallel to the axis is processed between the two annular steps, and the size of the through groove is consistent with the steel cable (102). After the steel cable (102) is fixed, the steel cable (102) is wound between the two annular steps.

8. The cable transmission anti-backward transmission mechanism according to claim 7, characterized in that: The through groove and the plane of the outer contour of the roller (9) are spaced 90 degrees apart along the circumference of the roller (9).

9. The cable transmission anti-backward transmission mechanism according to claim 1, characterized in that: The trapezoidal threaded rod (11) comprises a fork ear section, a polished rod section, a trapezoidal external thread section and a fixed external thread section in the axial direction. The trapezoidal external thread section is threadedly connected to the roller (9) in the bracket (10). The fork ear section is hinged to the rocker arm (111) at the upper end of the outer side of the bracket (10). The fixed external thread section is threadedly connected to the fastener (7) after passing through the end cover (6) at the lower end of the outer side of the bracket (10). The step at the connection between the polished rod section and the fork ear section provides axial movement limitation of the trapezoidal threaded rod (11) on the upper side of the bracket (10), and the end cover (6) provides axial movement limitation of the trapezoidal threaded rod (11) on the lower side of the bracket (10).

10. The cable transmission anti-backward transmission mechanism according to claim 1, characterized in that: 7254 extreme pressure grease is applied between the roller (9) and the trapezoidal threaded rod (11).

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