A break-in method for the adjuster in a gap self-adjusting mechanism

Abstract

This invention provides a break-in method for the adjuster in a clearance self-adjusting mechanism, belonging to the field of mechanical technology. It solves the problem of large fluctuations in slippage torque caused by the coaxiality difference between the spindle, inner bushing, and transmission gear. It includes: A) Installing the spindle, inner bushing, and transmission gear on a tooling fixture, simulating actual assembly conditions; vertically slidingly mounting the tooling on a support base; and installing a support spring on the support base, with the upper end of the support spring abutting or indirectly abutting against the lower end of the transmission gear; B) Pressing the tooling downwards using a pressing mechanism, driving the spindle to rotate using a torque output mechanism, and monitoring the slippage torque between the inner bushing and the transmission gear using a torque sensor until the fluctuation value of the slippage torque between the inner bushing and the transmission gear is less than a set value within a set number of rotations. It has the advantages of effectively ensuring the coaxiality of the spindle, inner bushing, and transmission gear, and minimizing the fluctuation of the slippage torque between the inner bushing and the transmission gear.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology and relates to a break-in method for an adjuster in a gap self-adjusting mechanism. Background Technology

[0002] A gap self-adjusting mechanism is a component found in all existing disc brakes. It automatically adjusts the brake gap to ensure that the brake pads maintain the required gap with the brake disc even after prolonged use. The adjuster is the key factor enabling this automatic brake gap adjustment. For example, the adjuster of the gap self-adjusting mechanism in an automotive disc brake, as described in patent application number 201110188782.2, includes a main shaft and an inner bushing and a transmission gear sequentially fitted onto the main shaft. The inner bushing and the transmission gear are linked, and when the torque between them is too high, they can slip against each other. An adjusting sleeve is fitted on the outer side of the inner bushing, and a one-way clutch is provided between the adjusting sleeve and the inner bushing. The transmission gear and the main shaft are circumferentially fixed by a key, and the contact between the transmission gear and the inner bushing is a conical contact provided by a preload spring to maintain contact and generate friction. The clearance self-adjusting mechanism in an automotive disc brake includes two screw tubes respectively screwed onto two push rods. The outer surface of the screw tubes has ring teeth. The clearance self-adjusting mechanism also includes a pin, which is connected to the power unit of the disc brake.

[0003] The adjuster is positioned between two solenoids. The transmission gear meshes with the ring teeth on the outer side of the solenoids. When the adjuster starts working, the power unit drives the pawl, which in turn drives the adjusting sleeve to rotate forward. The adjusting sleeve, through a one-way clutch, drives the inner bushing to rotate synchronously forward. The inner bushing, through the friction between the conical surfaces, drives the transmission gear to rotate, which in turn drives the ring teeth to rotate. The ring teeth then drive the solenoids to rotate, and the solenoids, through a threaded drive, push the brake block assembly against the brake disc. After braking, the adjuster needs to reset. The power unit drives the pawl to rotate in reverse, which in turn drives the adjusting sleeve to rotate in the opposite direction. Due to the one-way rotation characteristic of the one-way clutch, when the adjusting sleeve rotates in the opposite direction, the adjusting sleeve and the inner bushing spin freely. The pawl drives the adjusting sleeve to rotate until it returns to its initial state. The inner bushing and the transmission gear in this device are designed with conical contact. When the torque between the inner bushing and the transmission gear is too high, they can slip against each other, thus preventing them from seizing together. This gives the adjuster a self-protection function and improves its stability.

[0004] The inner bushing and drive gear are manufactured separately. After production, the conical surfaces between the inner bushing and drive gear need to be run-in. This is to ensure both a good fit between the two conical surfaces and to meet the actual operating requirements, specifically ensuring that the slippage torque between the inner bushing and drive gear remains relatively stable and does not fluctuate significantly during use. Since the slippage torque exists between the inner bushing and drive gear, the conventional running-in method is to simply press the inner bushing and drive gear together and rotate the drive gear relative to the inner bushing. However, while the inner bushing and drive gear are fitted onto the spindle during assembly, the spindle is not run-in together with them. This makes it difficult to guarantee the coaxiality of the spindle, inner bushing, and drive gear after assembly, causing the slippage torque to fluctuate beyond the theoretical design during use. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a break-in method for the adjuster in a gap self-adjusting mechanism, which solves the problem of large fluctuations in slippage torque caused by the difference in coaxiality of the main shaft, inner bushing, and transmission gear.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A break-in method for an adjuster in a gap self-adjusting mechanism, the adjuster comprising a main shaft, an inner bushing, and a transmission gear, characterized by comprising the following steps:

[0008] A. The spindle, inner bushing, and transmission gear are installed on a fixture to simulate the actual assembly situation. The fixture includes a mounting base and a limit sleeve with internal threads. The mounting base has a T-shaped mounting hole in the vertical direction. The spindle passes through the mounting hole and a thrust bearing is installed between the spindle and the upper wall of the mounting hole. The inner bushing is fitted onto the spindle until its upper end is located inside the lower part of the mounting hole. A one-way bearing is installed between the upper end of the inner bushing and the lower wall of the mounting hole. The transmission gear is fitted onto the spindle until its upper end forms a conical contact with the lower end of the inner bushing. A flat key is used to fix the transmission gear and the spindle circumferentially. The limit sleeve is threaded onto the lower end of the spindle and abuts against the transmission gear. The mounting base is slidably installed on a support base in the vertical direction. A support spring is set on the support base below the fixture. The upper end of the support spring abuts or indirectly abuts against the lower end of the transmission gear.

[0009] B. The tooling is pressed downward by a pressing mechanism, and the main shaft is driven to rotate at a set speed in the direction of slippage between the inner bushing and the transmission gear by a torque output mechanism. A torque sensor is used to monitor the slippage torque between the inner bushing and the transmission gear. The torque output mechanism stops working when the fluctuation value of the slippage torque between the inner bushing and the transmission gear is less than the set value within a set number of revolutions. The fluctuation value of the slippage torque is the difference between the maximum slippage torque and the minimum slippage torque monitored within the set number of revolutions.

[0010] Before break-in, the spindle, inner bushing, and drive gear are installed on the tooling to simulate actual assembly. The spindle is passed through the mounting hole of the tooling, and a thrust bearing is placed between the spindle and the upper part of the mounting hole. Then, the inner bushing is fitted from the lower end of the spindle upwards until the upper end of the inner bushing is located inside the lower part of the mounting hole, and a one-way bearing is placed between the upper end of the inner bushing and the lower part of the mounting hole. Next, the drive gear is fitted from the lower end of the spindle until it abuts against the inner bushing, and the drive gear and the spindle are engaged by a flat key. Finally, the limiting sleeve is threaded onto the lower end of the spindle and abuts against the drive gear. The drive gear is fixed axially between the inner bushing and the limiting sleeve. After the limiting sleeve is connected, the spindle, inner bushing, drive gear, and mounting base are connected to form a whole, and the upper end of the spindle protrudes outside the mounting base. Then, the mounting base is slidably connected to the support base in the vertical direction. Then, a support spring is 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 against the lower end of the transmission gear. A pressing mechanism then presses the fixture downwards, compressing the support spring and applying spring force to the transmission gear, creating friction between the transmission gear and the inner bushing as in actual operation. Next, a torque output mechanism drives the main shaft to rotate at a set speed along the direction of slippage between the inner bushing and the transmission gear. The main shaft drives the transmission gear to rotate via a key, while the inner bushing's rotation is restricted by a one-way bearing, thus causing slippage between the transmission gear and the inner bushing, just as in actual operation. After the main shaft drives the transmission gear to start rotating relative to the inner bushing, a torque sensor monitors the slippage torque between the inner bushing and the transmission gear. The torque output mechanism stops operating when the fluctuation value of the slippage torque between the inner bushing and the transmission gear is less than the set value within a set number of rotations.

[0011] This break-in method allows for the simultaneous break-in of the spindle, inner bushing, and transmission gears. After the break-in is completed, the spindle, inner bushing, and transmission gears are rotated as a set. This ensures the coaxiality of the spindle, inner bushing, and transmission gears during actual assembly and prevents significant fluctuations in the slippage torque between the inner bushing and transmission gears under actual working conditions.

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

[0013] By repeating step B, and ensuring that the downward pressing distance of the tooling by the pressing mechanism in each repetition of step B is greater than the downward pressing distance of the tooling by the pressing mechanism in the previous step B, the inner bushing and the transmission gear are broken in under different spring forces, and the spring force is gradually increased from low to high, rather than only breaking in once at the maximum pressing position. This multi-stage break-in is more in line with the process characteristics of the product, ensuring more stable fit performance after break-in, and making it less likely for the slippage torque to fluctuate significantly.

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

[0015] In the break-in method of the adjuster in the above-mentioned gap self-adjusting mechanism, in step B, after the main shaft rotates a certain number of times, it is determined whether the slippage torque fluctuation value between the inner bushing and the transmission gear is less than the set value within the set number of rotations.

[0016] After the top pressing mechanism presses the tooling downwards, the torque output mechanism drives the main shaft to rotate several times. During this period, the slippage torque within the set number of rotations is not judged to be less than the set value. The purpose of this setting is to ensure that the applied force can be generated stably, and to avoid the torque being judged as qualified before it has taken effect, thus ensuring the running-in accuracy.

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

[0018] To improve efficiency, the spindle rotates at a speed much higher than the actual operating speed in step C (120 RPM during break-in, 19 RPM in actual operation). However, excessively high speed can cause the product to overheat, which can affect the slippage torque and lead to errors in the judgment results. Therefore, the support is fixed in a cooling tank, allowing for cooling during break-in and preventing the product from overheating and affecting the accuracy of the judgment.

[0019] In the above-mentioned break-in method of the adjuster in a gap self-adjusting mechanism, in step A, the cooling tank is fixed on a frame, and in step B, the top pressing mechanism includes a bracket that is slidably mounted on the frame along the vertical direction and a drive motor mounted on the frame that can drive the bracket to move up and down.

[0020] In the above-mentioned break-in method of the adjuster in a gap self-adjustment mechanism, the torque output mechanism in step B includes a torque output motor and a transmission shaft. The torque output motor is fixed on the bracket, and the torque sensor is connected between the rotating shaft of the torque output motor and the transmission shaft. The bottom of the bracket is provided with a pressing part, and the lower end of the pressing part is lower than the lower end face of the transmission shaft. When the drive motor drives the bracket to move down 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 break-in period, the drive motor drives the bracket to move downwards. The bottom of the bracket presses against the mounting base and compresses the support spring. At the same time, the lower end of the drive shaft comes into contact with the upper end of the main shaft and forms a circumferential fixation. Then, the control torque output motor works. The shaft of the torque output motor rotates and drives the main shaft to rotate in the direction that causes the inner bushing to slip against the transmission gear.

[0022] Since the main shaft is driven to rotate by the drive shaft, the slippage torque between the inner bushing and the drive gear will act back onto the drive shaft. The torque sensor is connected between the shaft of the torque output motor and the drive shaft, so the slippage torque can be monitored using the torque sensor.

[0023] In the break-in method of the adjuster in the above-mentioned gap self-adjustment mechanism, a pressure sensor is fixed on the support base, and the lower end of the support spring abuts or indirectly abuts against the force-bearing part of the pressure sensor. The drive motor drives the bracket to move the pressing fixture downward until the pressure value collected by the pressure sensor reaches the set value and then stops.

[0024] The lower end of the support spring abuts or indirectly abuts against the force-bearing part of the pressure sensor. When the fixture is pressed downwards, compressing the support spring, the pressure applied by the pressing mechanism is transmitted to the force-bearing part of the pressure sensor. The pressure sensor then displays the pressure value it receives, which is equivalent to the spring force exerted by the compressed support spring on the transmission gear and the inner bushing. In each repeated step B, the drive motor drives the bracket to move the fixture downwards until the pressure value detected by the pressure sensor matches the set value. This allows for precise control of the downward movement of the fixture by the pressing mechanism each time.

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

[0026] 1. After simulating the actual assembly situation, install the spindle, inner bushing and transmission gear on the tooling and run them together. After the run-in is completed, the spindle, inner bushing and transmission gear are rotated as a set. This can ensure the coaxiality of the spindle, inner bushing and transmission gear during actual assembly and ensure that the slippage torque between the inner bushing and the transmission gear will not fluctuate greatly in actual working conditions.

[0027] 2. The inner bushing and transmission gear are run-in under different spring forces, gradually increasing from low to high spring force, rather than just a single run-in at the maximum compression position. This multi-stage run-in better meets the product's process requirements, ensuring more stable fit performance after run-in and reducing the likelihood of significant fluctuations in slippage torque. In particular, at low spring force, the friction between the transmission gear and the inner bushing is relatively low, resulting in less resistance during run-in and making it easier and smoother. Attached Figure Description

[0028] Figure 1 It is a sectional view of the spindle, inner bushing, and transmission gear after they are installed on the tooling in a simulated actual assembly situation.

[0029] Figure 2 It is a three-dimensional schematic diagram of the main shaft, inner bushing, and transmission gear after they are installed on the tooling, simulating the actual assembly situation.

[0030] Figure 3 This is a three-dimensional schematic diagram of the tooling and support springs after they have been installed on the support base.

[0031] Figure 4 This is a sectional view of the tooling and support springs after they have been installed on the support base.

[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 This is a three-dimensional schematic diagram of the top pressure mechanism and the torque output mechanism.

[0034] In the diagram, 1. Main shaft; 1a. Annular shoulder; 2. Inner bushing; 3. Transmission gear; 4. Tooling; 5. Mounting seat; 5a. Mounting hole; 6. Limiting sleeve; 7. Thrust bearing; 8. One-way bearing; 9. Flat key; 10. Support seat; 11. Support spring; 12. Cooling tank; 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 Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0036] A break-in method for an adjuster in a gap self-adjusting mechanism, the adjuster including a main shaft 1, an inner bushing 2, and a transmission gear 3, the main shaft 1 having an annular shoulder 1a on its outer circumference near the upper end, the inner bushing 2 having an outer conical surface at its lower end, and the transmission gear 3 having an inner conical surface at its upper end, the break-in method including the following steps:

[0037] A. As follows: Assemble the main shaft 1, inner bushing 2, and transmission gear 3... Figure 1 and Figure 2 As shown, the assembly is simulated on a tooling 4. Specifically, the tooling 4 includes a mounting base 5 and a limiting sleeve 6 with internal threads. The mounting base 5 has a T-shaped mounting hole 5a in the vertical direction. The spindle 1 passes through the mounting hole 5a and a thrust bearing 7 is set between the spindle 1 and the upper hole wall of the mounting hole 5a. The thrust bearing 7 abuts against the lower side of the annular shoulder 1a of the spindle 1. The inner bushing 2 is fitted onto the spindle 1 until its upper end is located in the lower part of the mounting hole 5a. A one-way bearing 8 is set between the upper end of the inner bushing 2 and the lower hole wall of the mounting hole 5a. The transmission gear 3 is then fitted onto the spindle 1 and the two are fixed together circumferentially with a flat key 9. The limiting sleeve 6 is then threaded to the lower end of the spindle 1 until it abuts against the transmission gear 3. The transmission gear 3 is fixed between the inner bushing 2 and the limiting sleeve 6 along the axial direction of the spindle 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 bushing.

[0038] Then, place tooling 4 as follows 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. 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, as Figure 5 As shown, the support base 10 can be fixed in a cooling tank 12. The cooling tank 12 has an inlet and an outlet higher than the inlet on its side. The inlet and outlet are connected to pipes respectively. The coolant flows into the cooling tank 12 from the inlet and flows out from the outlet, thus forming a circulation of coolant.

[0040] B. A pressing mechanism presses the fixture 4 downwards, and a torque output mechanism drives the main shaft 1 to rotate at a set speed along the direction of slippage between the inner bushing 2 and the transmission gear 3. Because of the one-way bearing 8, the transmission gear 3 experiences a slippage torque for each revolution relative to the inner bushing 2. A torque sensor 13 monitors the slippage torque between the inner bushing 2 and the transmission gear 3. The torque output mechanism stops operating when the fluctuation value of the slippage torque between the inner bushing 2 and the transmission gear 3 is less than the set value within a set number of revolutions. The slippage torque fluctuation value is the difference between the maximum and minimum slippage torques monitored within the set number of revolutions. To ensure accuracy, the main shaft 1 rotates several revolutions before determining whether the fluctuation value of the slippage torque between the inner bushing 2 and the transmission gear 3 is less than the set value within the set number of revolutions. Repeat step B several times, and each time the pressing mechanism in step B presses the fixture 4 downward by a greater distance than the previous pressing mechanism in step B, until the pressing mechanism presses the fixture 4 downward until the support spring 11 is at its maximum compression.

[0041] Before break-in, the spindle 1, inner bushing 2, and transmission gear 3 are installed on fixture 4 to simulate actual assembly. The spindle 1 is passed through the mounting hole 5a of fixture 4, and a thrust bearing 7 is placed between the upper part of the spindle 1 and the mounting hole 5a. Then, the inner bushing 2 is put on from the lower end of the spindle 1 until the upper end of the inner bushing 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 bushing 2 and the lower part of the mounting hole 5a. Next, the transmission gear 3 is put on from the lower end of the spindle 1 until it abuts against the inner bushing 2, and the transmission gear 3 and the spindle 1 are engaged by a flat key 9. Finally, the limiting sleeve 6 is threaded to the lower end of the spindle 1 and abuts against the transmission gear 3. The transmission gear 3 is fixed between the inner bushing 2 and the limiting sleeve 6 along the axial direction of the spindle 1. After the limiting sleeve 6 is connected, the main shaft 1, inner bushing 2, transmission gear 3, and mounting base 5 are connected to form a whole, and the upper end of the main shaft 1 protrudes beyond the mounting base 5. Then, the mounting base 5 is slidably connected to the support base 10 in the vertical direction. In this embodiment, regarding the connection of the mounting base 5 to the support base 10, two guide heads are provided on the support base 10 and two guide holes are correspondingly provided 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 against the lower end of the transmission gear 3. Then, a pressing mechanism presses the tooling 4 downward, so that the support spring 11 is compressed and in turn applies spring force to the transmission gear 3, so that friction can be formed between the transmission gear 3 and the inner bushing 2 as in actual working conditions. Next, the torque output mechanism drives the main shaft 1 to rotate at a set speed (120 rpm, but 19 rpm in actual operation) along the direction in which the inner bushing 2 and the transmission gear 3 slip. The main shaft 1 drives the transmission gear 3 to rotate via the key 9, while the inner bushing 2 is restricted from rotating by the one-way bearing 8. As a result, slippage occurs between the transmission gear 3 and the inner bushing 2, just as it would in actual operation. After the main shaft 1 drives the transmission gear 3 to start rotating relative to the inner bushing 2, the torque sensor 13 monitors the slippage torque between the inner bushing 2 and the transmission gear 3. The torque output mechanism stops operating when the fluctuation value of the slippage torque between the inner bushing 2 and the transmission gear 3 is less than the set value within a set number of revolutions (5 revolutions in this embodiment). Next, the pressing mechanism further presses the fixture 4 downwards (or, after one break-in period, the pressing mechanism can be reset to its initial position before pressing). This increases the compression of the support spring 11, which in turn increases the spring force applied by the support spring 11 to the transmission gear 3. This, in turn, drives the main shaft 1 to rotate via the torque output mechanism. Similarly, the torque output mechanism stops working once the slippage torque fluctuation between the inner bushing 2 and the transmission gear 3 is less than the set value within a set number of rotations. This process is repeated until the pressing mechanism presses the fixture 4 downwards to its maximum distance.

[0042] This break-in method allows for the simultaneous break-in of the spindle 1, inner bushing 2, and transmission gear 3. After break-in, the entire assembly of spindle 1, inner bushing 2, and transmission gear 3 is rotated, ensuring coaxiality during actual assembly and preventing significant fluctuations in the slippage torque between inner bushing 2 and transmission gear 3 under actual operating conditions. Furthermore, this break-in method involves running the inner bushing 2 and transmission gear 3 under varying spring forces, gradually increasing from low to high spring forces, rather than performing a single break-in at the maximum compression position. This multi-stage break-in process better aligns with the product's manufacturing requirements, ensuring more stable fit after break-in and reducing the likelihood of significant fluctuations in slippage torque.

[0043] like Figure 5 and Figure 6 As shown, the cooling tank 12 is fixed on the frame 14. The pressing mechanism includes a bracket 15 that is slidably mounted on the frame 14 vertically and a drive motor 16 mounted on the frame 14 that can drive the bracket 15 to move up and down. The drive motor 16 and the bracket 15 cooperate through a ball screw mechanism. A positioning seat 18 is fixed on the frame 14. The lower end of the lead screw in the ball screw mechanism passes through the positioning seat 18 and the two are fixed together axially. When the shaft of the drive motor 16 rotates, it will drive the lead screw in the ball screw mechanism to rotate. As the lead 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 drive 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 torque output motor shaft and the upper end of the drive shaft 20. The bottom of the bracket 15 is provided with a pressing part 15a. The lower end surface of the pressing part 15a is lower than the lower end surface of the drive shaft 20. When the drive motor 16 drives the bracket 15 to move down to abut against the tooling 4, the lower end of the drive shaft 20 is connected to the upper end of the main shaft 1 and forms a circumferential fixation. Specifically, during the break-in period, the drive motor 16 drives the bracket 15 to move downwards. The bottom pressing part 15a of the bracket 15 abuts against the mounting seat 5 and presses it down. This compresses the support spring 11 and applies spring force to the transmission gear 3, so that the transmission gear 3 and the inner bushing 2 can form friction 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. Then, the shaft of the torque output motor 19 rotates and drives the main shaft 1 to rotate in the direction that causes the inner bushing 2 and the transmission gear 3 to slip.

[0044] like Figure 3 and Figure 4As shown, a pressure sensor 21 is fixed on the support base 10. The lower end of the support spring 11 abuts or indirectly abuts against the force-bearing part of the pressure sensor 21. The drive motor 16 drives the bracket 15 to press the fixture 4 downwards until the pressure value collected by the pressure sensor 21 reaches the set value, at which point it stops. In this embodiment, the drive motor 16 first drives the bracket 15 to press the fixture 4 downwards until the pressure value collected by the pressure sensor 21 reaches 200N, at which point it stops. After the initial break-in period, the drive motor 16 drives the bracket 15 to press the fixture 4 downwards until the pressure value collected by the pressure sensor 21 reaches 400N, and so on, until the pressure value collected by the pressure sensor 21 reaches 2000N, which is the maximum distance the pressing mechanism can press the fixture 4 downwards. A spring seat 22 is provided between the lower end of the support spring 11 and the force-bearing part of the pressure sensor 21, and a support block 23 is provided 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 invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A break-in method for an adjuster in a gap self-adjusting mechanism, the adjuster comprising a main shaft (1), an inner bushing (2), and a transmission gear (3), characterized in that, Includes the following steps: A. The spindle (1), inner bushing (2), and transmission gear (3) are installed on a fixture (4) to simulate the actual assembly situation. The fixture (4) includes a mounting base (5) and a limiting sleeve (6) with internal threads. The mounting base (5) has a T-shaped mounting hole (5a) in the vertical direction. The spindle (1) is passed through the mounting hole (5a) and a thrust bearing (7) is installed between the spindle (1) and the upper hole wall of the mounting hole (5a). The inner bushing (2) is fitted onto the spindle (1) until its upper end is located in the lower part of the mounting hole (5a) and the upper end of the inner bushing (2) is in contact with the lower hole wall of the mounting hole (5a). A one-way bearing (8) is installed between the two sides. The transmission gear (3) is sleeved on the main shaft (1) until its upper end forms a conical contact with the lower end of the inner bushing (2). A flat key (9) is used to fix the transmission gear (3) and the main shaft (1) circumferentially. The limiting sleeve (6) is threaded 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. A support spring (11) is set on the support seat (10) below the tooling (4). The upper end of the support spring (11) abuts or indirectly abuts against the lower end of the transmission gear (3). B. The tooling (4) is pressed downward by a pressing mechanism, and the main shaft (1) is driven to rotate at a set speed in the direction of slippage between the inner bushing (2) and the transmission gear (3) by a torque output mechanism. The slippage torque between the inner bushing (2) and the transmission gear (3) is monitored by a torque sensor (13). The torque output mechanism stops working when the fluctuation value of the slippage torque between the inner bushing (2) and the transmission gear (3) is less than the set value in the set number of revolutions. The fluctuation value of the slippage torque is the difference between the maximum slippage torque and the minimum slippage torque monitored in the set number of revolutions. Repeat step B several times, and each time the pressing mechanism in step B presses the fixture (4) down a greater distance than the previous pressing mechanism in step B, until the pressing mechanism presses the fixture (4) down until the support spring (11) is at its maximum compression.

2. The break-in method for the adjuster in a gap self-adjusting mechanism according to claim 1, characterized in that, In step B, after the spindle (1) rotates a certain number of times, it is determined whether the slippage torque fluctuation value between the inner bushing (2) and the transmission gear (3) is less than the set value within the set number of rotations.

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

4. The break-in method for the adjuster in a gap self-adjusting mechanism according to claim 3, characterized in that, In step A, the cooling tank (12) is fixed on a frame (14). In step B, the pressing mechanism includes a bracket (15) that is slidably mounted on the frame (14) in the vertical direction and a drive motor (16) that is mounted on the frame (14) and can drive the bracket (15) to move up and down.

5. The break-in method for the adjuster in a gap self-adjusting mechanism according to claim 4, characterized in that, The torque output mechanism in step B includes a torque output motor (19) and a drive shaft (20). The torque output motor (19) is fixed on the bracket (15). The torque sensor (13) is connected between the rotating shaft of the torque output motor (19) and the drive shaft (20). The bottom of the bracket (15) is provided with a pressing part (15a). The lower end of the pressing part (15a) is lower than the lower end face of the drive shaft (20). When the drive motor (16) drives the bracket (15) to move down to abut against the tooling (4), the lower end of the drive shaft (20) is connected to the upper end of the main shaft (1) and forms a circumferential fixation.

6. The break-in method for the adjuster in a gap self-adjusting mechanism according to claim 3, characterized in that, A pressure sensor (21) is fixed on the support base (10). The lower end of the support spring (11) abuts or indirectly abuts against the force-bearing part of the pressure sensor (21). The drive motor (16) drives the bracket (15) and the pressing fixture (4) to move downwards until the pressure value collected on the pressure sensor (21) reaches the set value and then stops.

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