Running-in method of adjuster in gap self-adjusting mechanism

Abstract

The invention provides a running-in method of an adjuster in a gap self-adjusting mechanism, and belongs to the technical field of machinery. The problem that due to the fact that the coaxiality of a main shaft, a neck bush and a transmission gear is poor, slipping torque has large fluctuation is solved. The method comprises the steps that A, a main shaft, a neck bush and a transmission gear are installed on a tool by simulating the actual assembly condition, the tool is vertically installed on a supporting base in a sliding mode, a supporting spring is arranged on the supporting base, and the upper end of the supporting spring abuts against or indirectly abuts against the lower end of the transmission gear; and B, the tool is jacked downwards through a jacking mechanism, a torque output mechanism is used for driving the main shaft to rotate, and a torque sensor is used for monitoring the slipping torque between the neck bush and the transmission gear till the fluctuation value of the slipping torque between the neck bush and the transmission gear in the set number of turns is smaller than a set value. The device has the advantages that the coaxiality of the main shaft, the neck bush and the transmission gear can be well guaranteed, and the fluctuation of the slipping torque between the neck bush and the transmission gear is small.

Description

Technical Field

[0001] The invention belongs to the technical field of machinery and relates to a running-in method of an adjuster in a gap self-adjusting mechanism. Background Art

[0002] A clearance self-adjusting mechanism is a common feature in existing disc brakes. It automatically adjusts the brake clearance to ensure that the brake pad maintains the required clearance with the brake disc even after extended use. The adjuster is crucial for the self-adjusting mechanism's ability to achieve this. For example, patent application number 201110188782.2 discloses an adjuster for the clearance self-adjusting mechanism in an automotive disc brake. The adjuster comprises a main shaft, an inner sleeve, and a transmission gear, which are sequentially connected to the main shaft. The inner sleeve and transmission gear are in a linked relationship, and when the torque between the inner sleeve and transmission gear is excessive, the two can slip against each other. An adjustment sleeve is mounted on the outer side of the inner sleeve, and a one-way clutch is provided between the adjustment sleeve and the inner sleeve. The transmission gear and main shaft are circumferentially fixed by a flat key. The contact between the transmission gear and the inner sleeve is conical, and a preload spring provides a certain friction force to keep the two in contact. The clearance self-adjusting mechanism in the automobile disc brake includes two solenoids respectively screwed on two push rods, the outer side surfaces of the solenoids are provided with ring teeth, and the clearance self-adjusting mechanism also includes a detent pin connected to the power unit of the disc brake.

[0003] The adjuster is positioned between two solenoids, with a transmission gear meshing with the outer ring gears of the solenoids. When the adjuster begins operation, the power unit drives the detent pin, which in turn rotates the adjustment sleeve forward. The adjustment sleeve, through a one-way clutch, simultaneously rotates the inner sleeve forward. The friction between the conical surfaces of the inner sleeve drives the transmission gear, which in turn rotates the ring gear, which in turn rotates the solenoid. The solenoid, in turn, drives the push rod via a threaded drive to push the brake pad assembly against the brake disc. When braking is complete, the adjuster needs to be reset. The power unit reverses the detent pin, which in turn rotates the adjustment sleeve in the opposite direction. Due to the one-way rotation characteristic of the one-way clutch, when the adjustment sleeve rotates in the opposite direction, the adjustment sleeve and the inner sleeve rotate idly, and the detent pin rotates the adjustment sleeve until it returns to its initial position. The inner sleeve and transmission gear of this device are designed to contact each other through conical surfaces. When the torque between the inner sleeve and transmission gear is excessive, the two can slip against each other, preventing the inner sleeve and transmission gear from seizing. This provides a self-protection function and improves the stability of the adjuster.

[0004] Among them, the inner bushing and the transmission gear are produced separately. After production is completed, the conical surface between the inner bushing and the transmission gear needs to be run-in. First, to ensure the fit between the two conical surfaces, and second, to ensure that it can meet the actual working conditions. That is, to ensure that the slip torque between the inner bushing and the transmission gear remains basically stable and does not fluctuate greatly during use. Because the slip torque exists between the inner bushing and the transmission gear, the conventional running-in method is to simply press the inner bushing and the transmission gear together and then run-in by rotating the transmission gear relative to the inner bushing. However, the inner bushing and the transmission gear are both sleeved on the main shaft during assembly, but the main shaft is not run-in together with the inner bushing and the transmission gear. After actual assembly, it is difficult to ensure the coaxiality between the main shaft, the inner bushing and the transmission gear, which causes the slip torque to fluctuate beyond the theoretical design during use. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and propose a running-in method for the adjuster in the clearance self-adjusting mechanism, which solves the problem of large fluctuations in the slip torque caused by the coaxiality difference between the main shaft, inner sleeve and transmission gear.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A running-in method for an adjuster in a clearance self-adjusting mechanism, wherein the adjuster comprises a main shaft, an inner bushing and a transmission gear, and is characterized in that the method comprises the following steps:

[0008] A. Install the main shaft, inner bushing and transmission gear on a tool to simulate the actual assembly situation. The tool includes a mounting seat and a limit sleeve with an internal thread. The mounting seat is provided with a T-shaped mounting hole in the vertical direction. The main shaft passes through the mounting hole and a thrust bearing is installed between the main shaft and the upper hole wall of the mounting hole. The inner bushing is sleeved on the main shaft until its upper end is located in the lower part of the mounting hole and a one-way bearing is installed between the upper end of the inner bushing and the lower hole wall of the mounting hole. The transmission gear is sleeved on the main shaft until its upper end forms a conical contact with the lower end of the inner bushing. The transmission gear and the main shaft are fixed circumferentially with a flat key. The limit sleeve is threadedly connected to the lower end of the main shaft and abuts against the transmission gear. The mounting seat is slidably installed on a support seat in the vertical direction, and a support spring is provided on the support seat below the tool. The upper end of the support spring abuts or indirectly abuts against the lower end of the transmission gear.

[0009] B. Press the tooling downward through a pressing mechanism, and use a torque output mechanism to drive the main shaft to rotate at a set speed in the direction of slip between the inner sleeve and the transmission gear, and use a torque sensor to monitor the slip torque between the inner sleeve and the transmission gear until the slip torque fluctuation value between the inner sleeve and the transmission gear in the set number of revolutions is less than the set value, then stop the operation of the torque output mechanism. The slip torque fluctuation value is the difference between the maximum slip torque and the minimum slip torque monitored in the set number of revolutions.

[0010] Before running-in, the main shaft, inner sleeve, and transmission gear are installed on the tooling to simulate actual assembly conditions. The main shaft is passed through the mounting hole of the tooling and a thrust bearing is placed between the main shaft and the upper part of the mounting hole. The inner sleeve is then inserted from the lower end of the main shaft upward until the upper end of the inner sleeve is located in the lower part of the mounting hole, and a one-way bearing is placed between the upper end of the inner sleeve and the lower part of the mounting hole. The transmission gear is then inserted from the lower end of the main shaft until it rests against the inner sleeve and the transmission gear and the main shaft are matched with a flat key. Finally, the limit sleeve is threaded onto the lower end of the main shaft and rests against the transmission gear. The transmission gear is fixed between the inner sleeve and the limit sleeve along the axial direction of the main shaft. After the limit sleeve is connected, the main shaft, inner sleeve, transmission gear, and mounting seat are connected to form a whole, and the upper end of the main shaft protrudes outside the mounting seat. The mounting seat is then slidably connected to the support seat in the vertical direction. A support spring is then installed on the support base. After the mounting base is connected to the support base, the upper end of the support spring directly or indirectly abuts the lower end of the transmission gear. A pressing mechanism then presses the tooling downward, compressing the support spring and applying a spring force to the transmission gear, creating friction between the transmission gear and the inner sleeve, as in actual operation. The torque output mechanism then drives the main shaft to rotate at a set speed in the direction of slippage between the inner sleeve and the transmission gear. The main shaft, via the flat key, drives the transmission gear, while the inner sleeve is restricted by the one-way bearing. This causes slippage between the transmission gear and the inner sleeve, as in actual operation. After the main shaft drives the transmission gear to begin rotating relative to the inner sleeve, a torque sensor monitors the slip torque between the inner sleeve and the transmission gear. The torque output mechanism is deactivated until the slip torque fluctuation between the inner sleeve and the transmission gear falls below a set value over a set number of revolutions.

[0011] This running-in method can be used to run-in the main shaft, inner sleeve and transmission gear together. After the running-in is completed, the main shaft, inner sleeve and transmission gear are circulated as a set, thereby ensuring the coaxiality of the main shaft, inner sleeve and transmission gear during actual assembly, and ensuring that the slip torque between the inner sleeve and the transmission gear will no longer fluctuate greatly under actual working conditions.

[0012] In the above-mentioned method for running-in the adjuster in the self-adjusting gap mechanism, step B is repeated several times, and each time the pressing mechanism in step B presses the tooling downward by a distance greater than the distance the pressing mechanism in step B in the previous step pressed the tooling downward, until the pressing mechanism presses the tooling downward until the support spring is at its maximum compression amount.

[0013] By repeating step B, and each time the pressing mechanism in step B presses the tooling downward by a distance greater than the distance the pressing mechanism in step B pressed the tooling downward by the previous step B, the inner sleeve and the transmission gear are run-in under different spring forces, and the spring force is gradually increased from low to high, rather than just running-in once at the maximum downward pressure position. Such multi-stage running-in is more in line with the process characteristics of the product, ensuring that the matching performance after running-in is more stable and the slip torque is less likely to fluctuate significantly.

[0014] In particular, when the spring force is low, the friction between the transmission gear and the inner sleeve is relatively small, and the resistance encountered during running-in is also relatively small, making running-in easier and smoother.

[0015] In the above-mentioned method for running-in the adjuster in the clearance self-adjusting mechanism, in the step B, after the main shaft rotates several times, it is determined whether the slip torque fluctuation value between the inner sleeve and the transmission gear in the set number of revolutions is less than the set value.

[0016] After the pressing mechanism presses the tooling downward, the torque output mechanism first drives the spindle to rotate several times. During this period, no judgment is made as to whether the slip torque is less than the set value within the set number of turns. The purpose of this setting is to ensure that the loaded force can take effect stably, to avoid being judged as qualified before the torque takes effect, and to ensure the running-in accuracy.

[0017] In the above-mentioned method for running-in of an adjuster in a self-adjusting gap mechanism, in step A, the support seat is fixed in a cooling groove.

[0018] To improve efficiency, the spindle rotates at a speed much higher than the actual operating speed during step C (the speed used during the run-in is 120, while the actual operating speed is 19). However, excessively high speeds can easily cause the product to heat up, which can affect the slip torque and lead to errors in the judgment results. Therefore, the support base is fixed in a cooling tank to allow simultaneous cooling during the run-in process, preventing overheating of the product and affecting the accuracy of the judgment.

[0019] In the above-mentioned method for running-in the adjuster in a gap self-adjusting mechanism, the cooling trough is fixed on a frame in step A, and the pressing mechanism in step B includes a bracket arranged on the frame for vertical sliding and a drive motor arranged on the frame and capable of driving the bracket to move up and down.

[0020] In the above-mentioned method for running-in an adjuster in a gap self-adjusting mechanism, the torque output mechanism in step B includes a torque output motor and a transmission shaft. The torque output motor is fixed on a bracket, and the torque sensor is connected between the rotating shaft of the torque output motor and the transmission shaft. A top pressure portion is provided at the bottom of the bracket, and the lower end of the top pressure portion is lower than the lower end surface of the transmission shaft. When the driving motor drives the bracket to move downward to abut against the tooling, the lower end of the transmission shaft docks with the upper end of the main shaft and forms a circumferential fixation.

[0021] During the running-in period, the driving motor drives the bracket to move downward, and the top pressure part at the bottom of the bracket abuts against the mounting seat and presses it down to compress the support spring. At the same time, the lower end of the transmission shaft will be connected with the upper end of the main shaft to form a circumferential fixation. After that, the torque output motor is controlled to work, and the rotating shaft of the torque output motor rotates and drives the main shaft through the transmission shaft to rotate in the direction that causes the inner sleeve and the transmission gear to slip.

[0022] Because the main shaft is driven by the transmission shaft to rotate, the slip torque between the inner sleeve and the transmission gear will react to the transmission shaft, and the torque sensor is connected between the rotating shaft of the torque output motor and the transmission shaft, so the torque sensor can be used to monitor the slip torque.

[0023] In the above-mentioned method for running-in the adjuster in a gap self-adjusting mechanism, a pressure sensor is fixed on the support seat, and the lower end of the support spring abuts or indirectly abuts against the force-bearing part of the pressure sensor. The driving motor drives the bracket to press the tooling downward until the pressure value collected on the pressure sensor reaches the set value and stops.

[0024] The lower end of the support spring abuts or indirectly abuts the force-bearing portion of the pressure sensor. When the tooling is pressed downward, compressing the support spring, the pressure applied by the pressing mechanism is transmitted to the force-bearing portion of the pressure sensor. The pressure sensor then displays the pressure value, which is equivalent to the spring force acting between the transmission gear and the inner bushing after the support spring is compressed. In each repeated step B, the distance the motor drives the support to press the tooling downward stops when the pressure detected by the pressure sensor matches the set value. This allows for precise control of the distance the pressing mechanism moves the tooling downward each time.

[0025] Compared with the existing technology, the running-in method of the adjuster in the gap self-adjusting mechanism has the following advantages:

[0026] 1. Install the main shaft, inner sleeve and transmission gear on the fixture to simulate the actual assembly situation and then run in together. After the running-in is completed, the main shaft, inner sleeve and transmission gear are circulated as a set. This can well ensure the coaxiality of the main shaft, inner sleeve and transmission gear during actual assembly and ensure that the slip torque between the inner sleeve and transmission gear will not fluctuate greatly under actual working conditions.

[0027] 2. Run the inner bushing and transmission gear at different spring forces, gradually increasing from low to high spring forces, rather than just once at the maximum downward pressure position. This multi-stage run-in better meets the product's process requirements, ensuring more stable fit after run-in and less likely to cause significant fluctuations in slip torque. In particular, at low spring forces, the friction between the transmission gear and inner bushing is relatively low, and the resistance encountered during run-in is also relatively small, making run-in easier and smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a cross-sectional view of the main shaft, inner sleeve and transmission gear after being installed on the tooling to simulate the actual assembly situation.

[0029] Figure 2 It is a three-dimensional schematic diagram of the main shaft, inner sleeve and transmission gear after being installed on the tooling to simulate the actual assembly situation.

[0030] Figure 3 It is a three-dimensional schematic diagram after the tooling and support spring are set on the support seat.

[0031] Figure 4 This is a cross-sectional view after the tooling and support spring are installed on the support seat.

[0032] Figure 5 It is a three-dimensional schematic diagram of the cooling tank, top pressure mechanism and torque output mechanism installed on the frame.

[0033] Figure 6 It is a three-dimensional schematic diagram of the top pressure mechanism and the torque output mechanism.

[0034] In the figure, 1. main shaft; 1a. annular boss; 2. inner sleeve; 3. transmission gear; 4. tooling; 5. mounting seat; 5a. mounting hole; 6. limit sleeve; 7. thrust bearing; 8. one-way bearing; 9. flat key; 10. support seat; 11. support spring; 12. cooling groove; 13. torque sensor; 14. frame; 15. bracket; 15a. top pressure part; 16. drive motor; 17. ball screw mechanism; 18. positioning seat; 19. torque output motor; 20. transmission shaft; 21. pressure sensor; 22. spring seat; 23. support block. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0036] A running-in method for an adjuster in a clearance self-adjusting mechanism, the adjuster comprising a main shaft 1, an inner bushing 2, and a transmission gear 3, wherein the main shaft 1 is provided with an annular boss 1a on its outer circumference near its upper end, the lower end of the inner bushing 2 is provided with an outer conical surface, and the upper end of the transmission gear 3 is provided with an inner conical surface. The running-in method comprises the following steps:

[0037] A. Assemble the main shaft 1, inner sleeve 2 and transmission gear 3 as Figure 1 and Figure 2 The tool 4 is installed on a tool 4 to simulate the actual assembly situation as shown. Specifically, the tool 4 includes a mounting seat 5 and a limiting sleeve 6 with an internal thread. The mounting seat 5 is provided with a T-shaped mounting hole 5a in the vertical direction. The main shaft 1 is passed through the mounting hole 5a and a thrust bearing 7 is arranged between the main shaft 1 and the upper hole wall of the mounting hole 5a. The thrust bearing 7 is abutted against the lower side surface of the annular boss 1a of the main shaft 1. The inner sleeve 2 is sleeved onto the main shaft 1 until its upper end is located in the lower part of the mounting hole 5a. A one-way bearing 8 is arranged between the upper end of the inner sleeve 2 and the lower hole wall of the mounting hole 5a. Then the transmission gear 3 is sleeved onto the main shaft 1 and the two are fixed circumferentially with a flat key 9. The limiting sleeve 6 is then threadedly connected to the lower end of the main shaft 1 until it abuts against the transmission gear 3. The transmission gear 3 is fixed between the inner sleeve 2 and the limiting sleeve 6 along the axial direction of the main shaft 1 so that the inner conical surface of the upper end of the transmission gear 3 abuts against the outer conical surface of the lower end of the sleeve.

[0038] Then put the tool 4 as Figure 3 and Figure 4 As shown, it is slidably mounted on a support base 10 in the vertical direction, and a support spring 11 is provided on the support base 10 below the tooling 4 , and the upper end of the support spring 11 abuts or indirectly abuts against the lower end of the transmission gear 3 .

[0039] In this embodiment, if Figure 5 As shown, the support seat 10 can be fixed in a cooling groove 12, and the side of the cooling groove 12 is provided with a liquid inlet and a liquid outlet higher than the liquid inlet. The liquid inlet and the liquid outlet are connected to pipelines respectively, and the coolant flows into the cooling groove 12 from the liquid inlet and flows out from the liquid outlet, thereby forming a circulating flow of the coolant.

[0040] B. A pressing mechanism presses the tooling 4 downward, and a torque output mechanism drives the main shaft 1 to rotate at a set speed in the direction in which the inner sleeve 2 and the transmission gear 3 slip. Due to the presence of the one-way bearing 8, each rotation of the transmission gear 3 relative to the inner sleeve 2 generates a slip torque. A torque sensor 13 monitors the slip torque between the inner sleeve 2 and the transmission gear 3 until the slip torque fluctuation value between the inner sleeve 2 and the transmission gear 3 is less than a set value over a set number of rotations. The torque output mechanism is then stopped. The slip torque fluctuation value is the difference between the maximum and minimum slip torques monitored over the set number of rotations. To ensure detection accuracy, the main shaft 1 rotates several times before determining whether the slip torque fluctuation value between the inner sleeve 2 and the transmission gear 3 is less than a set value over the set number of rotations. Repeat step B several times, and each time the pressing mechanism in step B presses the tool 4 downward by a distance greater than the distance the pressing mechanism in step B pressed the tool 4 downward by the previous time, until the pressing mechanism presses the tool 4 downward until the support spring 11 is at its maximum compression amount.

[0041] Before running-in, the main shaft 1, inner sleeve 2, and transmission gear 3 are installed on the tooling 4 to simulate the actual assembly situation. The main shaft 1 is passed through the mounting hole 5a of the tooling 4 and a thrust bearing 7 is placed between the main shaft 1 and the upper part of the mounting hole 5a. The inner sleeve 2 is then inserted upward from the lower end of the main shaft 1 until the upper end of the inner sleeve 2 is located in the lower part of the mounting hole 5a, and a one-way bearing 8 is placed between the upper end of the inner sleeve 2 and the lower part of the mounting hole 5a. The transmission gear 3 is then inserted from the lower end of the main shaft 1 until it abuts against the inner sleeve 2, and the transmission gear 3 and the main shaft 1 are matched through the flat key 9. Finally, the limit sleeve 6 is threaded onto the lower end of the main shaft 1 and abuts against the transmission gear 3. The transmission gear 3 is fixed between the inner sleeve 2 and the limit sleeve 6 along the axial direction of the main shaft 1. After the stopper sleeve 6 is connected, the main shaft 1, inner sleeve 2, transmission gear 3, and mounting base 5 are connected to form a single unit, with the upper end of the main shaft 1 protruding from the mounting base 5. The mounting base 5 is then slidably connected to the support base 10 in the vertical direction. In this embodiment, the mounting base 5 is connected to the support base 10 by providing two guide heads on the support base 10 and two corresponding guide holes on the mounting base 5. The two guide heads pass through the two guide holes, respectively, so that the mounting base 5 can slide up and down relative to the support base 10. A support spring 11 is provided on the support base 10. After the mounting base 5 is connected to the support base 10, the upper end of the support spring 11 directly or indirectly abuts the lower end of the transmission gear 3. The tooling 4 is then pressed downward by a pressing mechanism, which compresses the support spring 11 and in turn applies a spring force to the transmission gear 3, thereby generating friction between the transmission gear 3 and the inner sleeve 2, as in actual working conditions. Next, the torque output mechanism drives the main shaft 1 to rotate at a set speed (the speed here is 120, and the speed in actual working conditions is 19) in the direction of slip between the inner sleeve 2 and the transmission gear 3. The main shaft 1 drives the transmission gear 3 to rotate through the flat key 9, while the inner sleeve 2 is restricted in rotation by the one-way bearing 8. As a result, slippage occurs between the transmission gear 3 and the inner sleeve 2, just as in actual working conditions. After the main shaft 1 drives the transmission gear 3 to begin rotating relative to the inner sleeve 2, the torque sensor 13 is used to monitor the slip torque between the inner sleeve 2 and the transmission gear 3. The torque output mechanism stops working until the slip torque fluctuation value between the inner sleeve 2 and the transmission gear 3 is less than the set value within a set number of revolutions (set to 5 revolutions in this embodiment). Next, the pressing mechanism is controlled to further press the tooling 4 downward (of course, after completing a run-in, the pressing mechanism can also be reset to its initial position before pressing again). This will increase the compression of the support spring 11, which in turn increases the spring force applied to the transmission gear 3. The main shaft 1 is then driven to rotate by the torque output mechanism, and the torque output mechanism stops operating after the slip torque fluctuation value between the inner sleeve 2 and the transmission gear 3 is less than the set value within the set number of revolutions. This step is repeated until the pressing mechanism presses the tooling 4 downward to the maximum distance.

[0042] This running-in method allows the main shaft 1, inner bushing 2, and transmission gear 3 to be run-in together. After the running-in is completed, the main shaft 1, inner bushing 2, and transmission gear 3 are circulated as a set, thereby effectively ensuring the coaxiality of the main shaft 1, inner bushing 2, and transmission gear 3 during actual assembly, and ensuring that the slip torque between the inner bushing 2 and the transmission gear 3 will no longer fluctuate significantly under actual working conditions. Moreover, in this running-in method, the inner bushing 2 and the transmission gear 3 are run-in under different spring forces, and the spring force is gradually increased from low to high, rather than just running-in once at the maximum downward pressure position. This multi-stage run-in better meets the process characteristics of the product, ensuring that the matching performance after running-in is more stable and the slip torque is less likely to fluctuate significantly.

[0043] like Figure 5 and Figure 6 As shown, the cooling trough 12 is fixed on the frame 14, and the top pressure mechanism includes a bracket 15 arranged on the frame 14 along the vertical sliding direction and a drive motor 16 arranged on the frame 14 and capable of driving the bracket 15 to move up and down. The drive motor 16 cooperates with the bracket 15 through a roller screw mechanism. A positioning seat 18 is fixed on the frame 14. The lower end of the screw in the roller screw mechanism passes through the positioning seat 18 and the two are fixed axially. When the rotating shaft of the drive motor 16 rotates, the screw in the roller screw mechanism will be driven to rotate. As the screw rotates, the ball screw mechanism 17 starts to work and drives the bracket 15 to move downward. The torque output mechanism includes a torque output motor 19 and a transmission shaft 20. The torque output motor 19 is fixedly connected to the bracket 15. The torque sensor 13 is connected between the lower end of the rotating shaft of the torque output shaft motor and the upper end of the transmission shaft 20. A pressing portion 15a is provided at the bottom of the bracket 15. The lower end surface of the pressing portion 15a is lower than the lower end surface of the transmission shaft 20. When the drive motor 16 drives the bracket 15 to move downward to abut against the tooling 4, the lower end of the transmission shaft 20 docks with the upper end of the main shaft 1 and forms a circumferential fixation. Specifically, during the running-in, the driving motor 16 drives the bracket 15 to move downward, and the top pressure part 15a at the bottom of the bracket 15 abuts against the mounting seat 5 and presses it down, so that the support spring 11 will be compressed and in turn apply spring force to the transmission gear 3 so that friction can be formed between the transmission gear 3 and the inner sleeve 2 as in actual working conditions. At the same time, the lower end of the transmission shaft 20 will be connected to the upper end of the main shaft 1 and form a circumferential fixation. After that, the rotating shaft of the torque output motor 19 rotates and drives the main shaft 1 to rotate through the transmission shaft 20 in the direction that causes the inner sleeve 2 and the transmission gear 3 to slip.

[0044] like Figure 3 and Figure 4As shown, a pressure sensor 21 is fixed to the support base 10. The lower end of the support spring 11 abuts or indirectly abuts the force-bearing portion of the pressure sensor 21. The drive motor 16 drives the bracket 15 to press the tooling 4 downward until the pressure value recorded by the pressure sensor 21 reaches a set value. In this embodiment, the drive motor 16 initially drives the bracket 15 to press the tooling 4 downward until the pressure value recorded by the pressure sensor 21 reaches 200N. After the initial run-in is completed, the drive motor 16 controls the bracket 15 to press the tooling 4 downward until the pressure value recorded by the pressure sensor 21 reaches 400N. This continues until the pressure value recorded by the pressure sensor 21 reaches 2000N, which is the maximum distance the pressing mechanism can press the tooling 4 downward. A spring seat 22 abuts between the lower end of the support spring 11 and the force-bearing portion of the pressure sensor 21, and a support block 23 abuts between the upper end of the support spring 11 and the transmission gear 3.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A running-in method for an adjuster in a clearance self-adjusting mechanism, wherein the adjuster comprises a main shaft (1), an inner bushing (2) and a transmission gear (3), characterized in that: The following steps are involved: A. Install the main shaft (1), the inner sleeve (2) and the transmission gear (3) on a tool (4) to simulate the actual assembly situation. The tool (4) includes a mounting seat (5) and a limiting sleeve (6) with an internal thread. The mounting seat (5) is provided with a T-shaped mounting hole (5a) in the vertical direction. The main shaft (1) is passed through the mounting hole (5a) and a thrust bearing (7) is installed between the main shaft (1) and the upper hole wall of the mounting hole (5a). The inner sleeve (2) is sleeved on the main shaft (1) until its upper end is located in the lower part of the mounting hole (5a) and between the upper end of the inner sleeve (2) and the lower hole wall of the mounting hole (5a). A one-way bearing (8) is installed between the main shaft (1), the transmission gear (3) is sleeved onto the main shaft (1) until its upper end forms a conical contact with the lower end of the inner sleeve (2), and the transmission gear (3) is fixed to the main shaft (1) in the circumferential direction with a flat key (9). The limit sleeve (6) is threadedly connected to the lower end of the main shaft (1) and abuts against the transmission gear (3). The mounting seat (5) is slidably installed on a support seat (10) in the vertical direction, and a support spring (11) is provided on the support seat (10) below the tooling (4), and the upper end of the support spring (11) abuts or indirectly abuts against the lower end of the transmission gear (3); B. Pressing the tooling (4) downwards by a pressing mechanism, driving the main shaft (1) to rotate along the direction of slippage between the inner sleeve (2) and the transmission gear (3) at a set speed by a torque output mechanism, and monitoring the slip torque between the inner sleeve (2) and the transmission gear (3) by a torque sensor (13), until the slip torque fluctuation value between the inner sleeve (2) and the transmission gear (3) is less than a set value in a set number of revolutions, and then stopping the operation of the torque output mechanism, wherein the slip torque fluctuation value is the difference between the maximum slip torque and the minimum slip torque monitored in the set number of revolutions.

2. The method for running-in an adjuster in a gap self-adjusting mechanism according to claim 1, characterized in that: Repeat step B several times, and each time the pressing mechanism in step B presses the tooling (4) downwards by a distance greater than the distance the pressing mechanism in step B last pressed the tooling (4) downwards, until the pressing mechanism presses the tooling (4) downwards until the support spring (11) is at its maximum compression amount.

3. The running-in method of the adjuster in the gap self-adjusting mechanism according to claim 2, characterized in that: In the step B, after the main shaft (1) rotates several times, it is determined whether the slip torque fluctuation value between the inner sleeve (2) and the transmission gear (3) is less than the set value in the set number of revolutions.

4. A running-in method for an adjuster in a gap self-adjusting mechanism according to claim 1, 2 or 3, characterized in that: In step A, the support base (10) is fixed in a cooling tank (12).

5. The running-in method of the adjuster in the gap self-adjusting mechanism according to claim 4, characterized in that: In step A, the cooling trough (12) is fixed on a frame (14), and in step B, the pressing mechanism includes a bracket (15) vertically slidably arranged on the frame (14) and a driving motor (16) arranged on the frame (14) and capable of driving the bracket (15) to move up and down.

6. The running-in method of the adjuster in the gap self-adjusting mechanism according to claim 5, characterized in that: The torque output mechanism in step B includes a torque output motor (19) and a transmission shaft (20), wherein the torque output motor (19) is fixed on the bracket (15), and the torque sensor (13) is connected between the rotating shaft of the torque output motor (19) and the transmission shaft (20). The bottom of the bracket (15) is provided with a pressing portion (15a), and the lower end of the pressing portion (15a) is lower than the lower end surface of the transmission shaft (20). When the driving motor (16) drives the bracket (15) to move downward to abut against the tooling (4), the lower end of the transmission shaft (20) is docked with the upper end of the main shaft (1) and forms a circumferential fixation.

7. The running-in method of the adjuster in the gap self-adjusting mechanism according to claim 4, characterized in that: A pressure sensor (21) is fixed on the support seat (10), and the lower end of the support spring (11) abuts or indirectly abuts on the force-bearing part of the pressure sensor (21). The driving motor (16) drives the bracket (15) to press the tooling (4) downward until the pressure value collected by the pressure sensor (21) reaches a set value and stops.

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