Steering engine transmission mechanism anti-backlash pre-tightening device

Abstract

An anti-backlash pre-tightening device of a steering engine transmission mechanism comprises a locking nut, a set screw and a steering engine frame. The locking nut is provided with a steering engine through hole, a circle of sawteeth are arranged at the top end of the cylindrical face of the locking nut, and threads are arranged at the bottom end of the cylindrical face. The steering engine frame is provided with a nut mounting through hole; a circle of screw mounting boss is arranged on the upper end face of the steering engine frame along the nut mounting through holes, and a plurality of screw mounting through holes are evenly formed in the side face of the screw mounting boss. The steering engine frame is nested on the bearing through the nut mounting through hole; the locking nut is screwed into the nut mounting through hole, and the lower end face of the locking nut abuts against the upper end face of the bearing. A set screw is fixed in each screw mounting through hole, and the tail end of each set screw is adaptively embedded into a tooth groove between two adjacent sawteeth on the cylindrical surface of the locking nut; when the bearing tends to loosen, the locking nut is driven to rotate upwards along the thread; at the moment, the set screw limits movement of the locking nut, and therefore pre-tightening and looseness prevention of the bearing are achieved.

Description

Technical Field

[0001] This invention relates to a backlash elimination and pre-tightening device for a servo drive mechanism, belonging to the field of backlash elimination and pre-tightening adjustment of aircraft servo drive mechanisms. Background Technology

[0002] With the advancement of aircraft technology, the requirements for control accuracy of servo motors under small signals are becoming increasingly stringent, which also places higher demands on the transmission clearance and preload of the servo motors. Excessive transmission clearance or poor servo motor preload will lead to a decrease in the overall rigidity of the transmission mechanism, which in turn will cause servo resonance in the entire mechanism, thereby reducing the tracking accuracy of the servo motor under small signals.

[0003] The most common method for eliminating transmission backlash is to first measure the actual backlash and then remove it by installing backlash-eliminating shims. This method requires manufacturing specific backlash-eliminating shims for each specific backlash, resulting in low production efficiency and poor shim versatility. Furthermore, the effectiveness of using backlash-eliminating shims to eliminate transmission backlash is not ideal due to limitations in shim machining accuracy and mechanism installation errors. Simultaneously, most commonly used transmission mechanism preload methods utilize constant torque screwdrivers, which, constrained by the screwdriver's setting and accuracy, result in discrepancies between the preload output and the actual preload. Therefore, a device is urgently needed that can preload the transmission mechanism while simultaneously eliminating backlash. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a backlash elimination and pre-tightening device for a servo drive mechanism. This device, through the engaging and locking cooperation of a locking nut and a set screw, achieves pre-tightening of the servo drive while eliminating backlash, thus solving the problems of poor versatility and unsatisfactory pre-tightening effects of existing backlash elimination methods.

[0005] The technical solution of this invention is: A backlash-eliminating preload device for a servo drive mechanism includes: a lock nut, a set screw, and a servo frame; The locking nut is a cylindrical structure with a servo motor through hole that passes through both the upper and lower end faces along the axial direction; the cylindrical surface of the locking nut has a serration at the top and a thread at the bottom. The servo frame is provided with a nut mounting through hole that runs through its upper and lower end faces. The diameter of the nut mounting through hole is adapted to the diameter of the locking nut, and its inner wall is provided with threads. The upper end face of the servo frame is provided with a ring of screw mounting bosses along the nut mounting through hole. The side of the screw mounting boss is provided with multiple screw mounting through holes evenly distributed circumferentially. The center line of all screw mounting through holes points to the center position of the nut mounting through hole. The servo frame is nested on the bearing through a nut mounting hole; the locking nut is screwed into the nut mounting hole through a thread on its cylindrical surface; the lower end face of the locking nut abuts against the upper end face of the bearing; a rotating shaft passes through the middle part of the bearing, with the portion of the rotating shaft extending from the upper end face of the bearing located in the servo mounting hole of the locking nut; each screw mounting hole has a set screw fixed inside, and the end of each set screw extends out from the corresponding screw mounting hole and fits into the groove between two adjacent serrations on the cylindrical surface of the locking nut; when the bearing tends to loosen, it drives the locking nut to rotate upward along the thread; at this time, the set screw restricts the movement of the locking nut, thereby achieving pre-tightening and anti-loosening of the bearing.

[0006] Furthermore, the locking nut and set screw are made of precipitation hardening stainless steel; the servo frame is made of hard aluminum.

[0007] Furthermore, the screw mounting boss of the servo frame has no fewer than two screw mounting through holes.

[0008] Furthermore, the locking nut has at least 40 serrations.

[0009] Furthermore, when the bearing tends to loosen, the bearing applies an axial upward force to the locking nut, causing the locking nut to rotate upward along the thread. At this time, the end of the set screw engages with the serrated structure of the locking nut. Since the set screw is fixed in the corresponding screw mounting hole, the set screw restricts the locking nut from rotating circumferentially, thereby achieving pre-tightening and anti-loosening of the bearing.

[0010] Secondly, the present invention also proposes a backlash elimination pre-tightening method for a servo motor transmission mechanism. This backlash elimination pre-tightening method is based on the aforementioned backlash elimination pre-tightening device for a servo motor transmission mechanism, and the specific process is as follows: The first step is to mount the servo frame onto the bearing with the rotating shaft by using the nut mounting hole; The second step is to screw the lock nut into the nut mounting hole through the thread on its cylindrical surface; the lower end face of the lock nut abuts against the upper end face of the bearing. The third step is to fix a set screw inside each screw mounting hole. The end of each set screw extends out of the corresponding screw mounting hole and fits into the groove between two adjacent serrations on the cylindrical surface of the lock nut. When the bearing tends to loosen, it drives the lock nut to rotate upward along the thread. At this time, the set screw restricts the movement of the lock nut, thereby achieving pre-tightening and anti-loosening of the bearing.

[0011] The advantages of this invention compared to the prior art are: (1) The present invention achieves pre-tightening of the servo motor by locking the nut and the set screw in a snap-fit ​​engagement, thereby eliminating the servo motor clearance. The locking nut only needs to be screwed into the frame to eliminate the clearance, which is highly versatile. The snap-fit ​​engagement of the locking nut and the set screw can provide good pre-tightening of the servo motor.

[0012] (2) The present invention has a simple structure, is easy to disassemble and manufacture, and has low production cost. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a backlash elimination pre-tightening device for a servo motor transmission mechanism according to the present invention; Figure 2 This is a top view of a backlash elimination preload device for a servo motor transmission mechanism according to the present invention; Figure 3 This is a schematic diagram of a locking nut for a backlash-eliminating pre-tightening device in a servo motor transmission mechanism according to the present invention; Figure 4 This is a schematic diagram illustrating the application scenario of the backlash elimination pre-tightening device for a servo motor transmission mechanism according to the present invention. Detailed Implementation

[0014] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0015] like Figure 1 and Figure 2 As shown, the present invention provides a backlash elimination preload device for a servo drive mechanism, comprising: a locking nut 1, a set screw 2, and a servo frame 3; like Figure 3 As shown, the locking nut 1 has a cylindrical structure with a through hole for the servo motor that passes through both the upper and lower end faces along the axial direction; the cylindrical surface of the locking nut 1 has a serration at the top and a thread at the bottom. The servo frame 3 is provided with a nut mounting through hole that runs through its upper and lower end faces. The diameter of the nut mounting through hole is adapted to the diameter of the locking nut 1, and its inner wall is provided with threads. The upper end face of the servo frame 3 is provided with a ring of screw mounting bosses along the nut mounting through hole. The side of the screw mounting boss is provided with multiple screw mounting through holes evenly distributed in the circumferential direction. The center line of all screw mounting through holes points to the center position of the nut mounting through hole. like Figure 4As shown, the servo frame 3 is nested on the bearing 4 through the nut mounting through hole; the locking nut 1 is screwed into the nut mounting through hole through the thread on its cylindrical surface; the lower end face of the locking nut 1 abuts against the upper end face of the bearing 4; a rotating shaft 5 is inserted through the middle part of the bearing 4, and the part of the rotating shaft 5 that extends out from the upper end face of the bearing 4 is located in the servo through hole of the locking nut 1; a set screw 2 is fixed inside each screw mounting through hole, and the end of each set screw 2 extends out from the corresponding screw mounting through hole and is fitted into the tooth groove between two adjacent serrations on the cylindrical surface of the locking nut 1; when the bearing 4 tends to loosen, it drives the locking nut 1 to rotate upward along the thread; at this time, the set screw 2 restricts the movement of the locking nut 1, thereby achieving the pre-tightening and anti-loosening of the bearing 4.

[0016] Furthermore, the locking nut 1 and the set screw 2 are made of precipitation-hardening stainless steel, but are not limited to precipitation-hardening stainless steel; the servo frame 3 is made of hard aluminum, but is not limited to hard aluminum.

[0017] Furthermore, the screw mounting boss of the servo frame 3 has more than two screw mounting through holes; the more holes there are, the better the anti-loosening performance.

[0018] Furthermore, the locking nut 1 has more than 40 serrations; the more serrations, the higher the pre-tightening accuracy.

[0019] Furthermore, when the bearing 4 tends to loosen, the bearing 4 applies an axial upward force to the locking nut 1, causing the locking nut 1 to rotate upward along the thread; at this time, the end of the set screw 2 engages with the serrated structure of the locking nut 1. Since the set screw 2 is fixed in the corresponding screw mounting through hole, the set screw 2 restricts the locking nut 1 from rotating circumferentially, thereby achieving pre-tightening and anti-loosening of the bearing 4.

[0020] Based on the above design, the present invention achieves servo preload while eliminating servo backlash through the interlocking engagement of the locking nut and the set screw. The locking nut only needs to be screwed into the frame to eliminate backlash, making it highly versatile. The interlocking engagement of the locking nut and the set screw can provide good preload for the servo. In addition, the present invention has a simple structure, is easy to disassemble and manufacture, and has low production costs.

[0021] Secondly, the present invention also proposes a backlash elimination pre-tightening method for a servo motor transmission mechanism. This backlash elimination pre-tightening method is based on the aforementioned backlash elimination pre-tightening device for a servo motor transmission mechanism, and the specific process is as follows: The first step is to mount the servo frame 3 onto the bearing 4, which is equipped with the rotating shaft 5, through the nut mounting hole; The second step is to screw the locking nut 1 into the nut mounting through hole through the thread provided on its cylindrical surface; the lower end face of the locking nut 1 abuts against the upper end face of the bearing 4. The third step is to fix a set screw 2 inside each screw mounting through hole. The end of each set screw 2 extends out from the corresponding screw mounting through hole and is fitted into the groove between two adjacent serrations on the cylindrical surface of the locking nut 1. When the bearing 4 tends to loosen, it drives the locking nut 1 to rotate upward along the thread. At this time, the set screw 2 restricts the movement of the locking nut 1, thereby achieving the pre-tightening and anti-loosening of the bearing 4.

[0022] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A rudder drive mechanism anti-backlash pre-tensioning device, characterized by Comprise: Locking nut (1), locking screw (2) and rudder frame (3); The locking nut (1) is cylindrical structure, it is equipped with rudder through hole along axial direction and opens two end faces; The cylindrical surface of locking nut (1) is equipped with a circle sawtooth along circumferential direction in top end position, and is equipped with thread in bottom end position; The rudder frame (3) is equipped with nut mounting through hole that penetrates its upper and lower two end faces, the diameter of nut mounting through hole is compatible with the diameter of locking nut (1), and the inner wall is equipped with thread; The upper end face of rudder frame (3) is equipped with a circle screw mounting boss along nut mounting through hole, the side of screw mounting boss is uniformly equipped with multiple screw mounting through holes along circumferential direction, and the center line of all screw mounting through holes points to the center position of nut mounting through hole; The rudder frame (3) is nested on bearing (4) through nut mounting through hole; The locking nut (1) is screwed into nut mounting through hole through the thread of its cylindrical surface; The lower end face of locking nut (1) is in contact with the upper end face of bearing (4); The middle part of bearing (4) is equipped with rotating shaft (5), and the part of rotating shaft (5) that is out of the upper end face of bearing (4) is located in the rudder through hole of locking nut (1); Each screw mounting through hole is fixed with locking screw (2), and the end of each locking screw (2) is out of the corresponding screw mounting through hole and is embedded into the tooth slot between the two adjacent sawteeth on the cylindrical surface of locking nut (1); When the bearing (4) produces loosening tendency, the locking nut (1) is driven to rotate upward along the thread; At this time, the locking screw (2) limits the movement of locking nut (1), thereby realizing the pre-tightening and loosening prevention of bearing (4).

2. The lost motion preloading device for a steering gear drive mechanism according to claim 1, characterized in that: The manufacturing material of locking nut (1) and locking screw (2) is precipitation hardening stainless steel; The manufacturing material of rudder frame (3) is hard aluminum.

3. The lost motion preloading device for a steering gear drive mechanism according to claim 1, wherein: The number of screw mounting through holes provided on the screw mounting boss of rudder frame (3) is not less than 2.

4. The lost motion preloading device for a steering gear drive mechanism of claim 1 wherein: The number of sawteeth provided on locking nut (1) is not less than 40.

5. The lost motion preloading device for a steering gear drive mechanism of claim 1 wherein: When the bearing (4) produces loosening tendency, the bearing (4) exerts an axial upward force on the locking nut (1), which drives the locking nut (1) to rotate upward along the thread; At this time, the end of locking screw (2) is engaged with the sawtooth structure of locking nut (1), and since the locking screw (2) is fixed in the corresponding screw mounting through hole, the locking screw (2) limits the circumferential rotation of the locking nut (1), thereby realizing the pre-tightening and loosening prevention of the bearing (4).

6. A method for pre-tightening a rudder drive mechanism to eliminate backlash, characterized in that: The anti-backlash pre-tightening method is realized based on the anti-backlash pre-tightening device of the rudder transmission mechanism according to any one of claims 1-5, and the specific process is as follows: Firstly, the rudder frame (3) is nested on the bearing (4) equipped with rotating shaft (5) through the nut mounting through hole; Secondly, the locking nut (1) is screwed into the nut mounting through hole through the thread provided on its cylindrical surface; the lower end face of the locking nut (1) is in contact with the upper end face of the bearing (4); Third, in each screw mounting hole inside fixed a tight screw (2), each end of the tight screw (2) from the corresponding screw mounting hole, fitting embedded in the adjacent two sawtooth between the tooth groove on the cylindrical surface of the lock nut (1); when the bearing (4) loose tendency, drive the lock nut (1) along the thread upward rotation; at this time, the tight screw (2) limit lock nut (1) movement, so as to realize the pre tightening of the bearing (4) loose.

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