Automobile brake hub brake pad clearance adjusting device

Abstract

The application discloses a kind of automobile brake hub brake pad gap adjusting equipment applied to automobile brake field, the cooperation between the oil cylinder, brake pad assembly and driving rod, when brake pad appears loss, gap ring will be worn simultaneously, when the cementing outer edge of gap ring is worn, the inner edge of hanging is separated, at this time, convex edge is close to next gap ring under the tension of tension spring, and the inner edge of next gap ring is used to form the hanging effect with convex edge, while driving rod is displaced in tension spring, in displacement, the execution ring with ball is rotated using spiral groove, and then driven gear is rotated using driving gear, and the thread groove and the thread convex groove are cooperated, and the oil cylinder is rotated to the brake disc, since brake pad assembly is assembled on the output rod of oil cylinder, brake pad assembly is synchronously displaced with oil cylinder, so that the initial assembly gap between worn brake pad and brake disc can be maintained.

Description

Technical Field

[0001] This invention relates to the field of automotive brakes, and in particular to a device for adjusting the gap between brake pads on automotive brake hubs. Background Technology

[0002] During vehicle braking, there is a certain braking clearance between the brake drum and the brake pads. As the number of braking cycles increases, the brake drum and brake pads will wear and create clearance. If the clearance is too small, it cannot guarantee that the brake will be completely released. If the clearance is too large, the brake pad travel will increase, prolonging the braking time. In severe cases, even if the brake pedal is pressed to its limit, it will not be able to generate sufficient braking torque, causing a safety accident. Currently, manual adjustment and automatic adjustment by the brake caliper push rod are mainly used. However, under-adjustment or over-adjustment are prone to occur, resulting in inaccurate precision and still large errors.

[0003] Therefore, the inventor has conceived of a gap adjustment device that automatically adjusts the gap between the brake pads and the brake disc when the brake pads are worn, while maintaining the initial assembly gap, thereby reducing braking distance and improving braking safety. Summary of the Invention

[0004] The purpose of this invention is to design a gap adjustment device that automatically adjusts the gap between the brake pads and the brake disc when the brake pads are worn, while maintaining the initial assembly gap, thereby reducing braking distance and improving braking safety. Compared with the prior art, this invention provides a brake pad gap adjustment device for automotive brake hubs. It includes a bracket that is snapped onto one side of the brake disc, with caliper housings on both sides of the bracket. Each caliper housing has two sets of symmetrically arranged hydraulic cylinders. The caliper housing has an assembly through hole corresponding to the hydraulic cylinder, and the inner wall of the assembly through hole has a threaded groove. The outer wall of the hydraulic cylinder has a threaded protrusion corresponding to the threaded groove. The caliper housing also has a limiting device that allows the hydraulic cylinder to rotate in one direction.

[0005] The bracket contains a brake pad assembly, which includes a fixing plate and brake pads fixed to one side of the fixing plate. The fixing plate has two sets of symmetrically arranged rotating seats on the side away from the brake pads. The cylinder contains an output rod, the end of which extends into the rotating seat and is rotatably connected to it.

[0006] The fixed plate has a rotating slide rail in the middle, and an actuating ring is rotatably connected on the rotating slide rail. A drive gear is provided on the outer circumference of the actuating ring. One end of the oil cylinder extends through the assembly through hole and is fixed with a driven gear that meshes with the drive gear.

[0007] The inner circumference of the actuator ring is provided with a drive rod, the outer wall of the drive rod is provided with several helical grooves evenly distributed at equal angles, the inner circumference of the actuator ring is provided with balls that match the helical grooves one by one, one end of the drive rod is fixed with a spline shaft, the caliper housing is provided with a spline groove corresponding to the spline shaft, and a tension spring is fixed between the spline shaft and the spline groove.

[0008] The other end of the drive rod is fixed with a protruding edge. The brake pad is provided with a gap hole corresponding to the protruding edge. Several gap rings are glued and fixed in the gap hole at equal intervals. The gap ring includes an glued outer edge fixed to the inner wall of the gap hole. An inner edge for hooking the protruding edge is fixed on the inner side of the glued outer edge.

[0009] When brake pads wear out, the clearance rings also wear down. When the outer edge of the clearance ring wears down, the inner edge detaches. At this time, the convex edge, under the tension of the tension spring, moves closer to the next clearance ring and forms an engagement with the inner edge of the next clearance ring. Simultaneously, the drive rod is displaced by the tension spring. During this displacement, the helical groove drives the actuator ring with balls to rotate, which in turn drives the driven gear to rotate. With the help of the threaded groove and threaded protrusion, the cylinder rotates closer to the brake disc. Since the brake pad assembly is mounted on the output rod of the cylinder, the brake pad assembly moves synchronously with the cylinder. Therefore, the initial assembly clearance between the worn brake pads and the brake disc can always be maintained.

[0010] Furthermore, the limiting device includes a limiting ring, which is slidably sleeved on one side of the outer wall of the cylinder. Several limiting blocks are fixedly arranged at equal angles on the inner side of the limiting ring. The outer wall of the cylinder is provided with limiting grooves that correspond one-to-one with the limiting blocks. A tension spring is fixed between one side of the limiting ring and the mounting through hole. A reverse gear is provided on the other side of the limiting ring. One end of the mounting through hole is provided with a reverse gear groove that matches the reverse gear.

[0011] Furthermore, the two cylinders on the same side have opposite rotational directions, and the rotational movements of the two cylinders in their respective rotational directions can both approach the brake disc by utilizing the engagement of the threaded protrusions and grooves.

[0012] Furthermore, the tension spring is a high-strength fatigue-resistant spring structure, and the tension spring has the elastic force to drive the limiting ring close to the reversing tooth groove.

[0013] Furthermore, the hydraulic cylinder is connected to the hydraulic output system via pipelines, and a piston that matches the hydraulic cylinder is fixed on the output rod. The stroke of the output rod under hydraulic drive inside the hydraulic cylinder is a fixed value.

[0014] Furthermore, the tension spring is a high-strength, fatigue-resistant spring structure, and it has the tension to drive the drive rod away from the brake pads.

[0015] Furthermore, the tension of the tension spring is greater than the total friction between the threaded protrusion and groove, the helical groove and the ball, and the adhesive force between a single gap ring and the gap hole is greater than the tension of the tension spring.

[0016] Furthermore, the diameter of the raised edge is larger than the diameter of the drive rod, the inner diameter of the inner edge of the hook is not larger than the diameter of the raised edge, and the structural hardness of the inner edge of the hook and the outer edge of the adhesive is less than the structural hardness of the brake disc.

[0017] Furthermore, each single drive gear simultaneously meshes with a driven gear located on both sides of it. The thickness of the drive gear is greater than the thickness of the driven gear and equal to the initial thickness of the brake pad.

[0018] Furthermore, the diameter of the drive gear is larger than that of the driven gear, and lubricating oil is applied between the drive gear and the driven gear, the threaded protrusion and the threaded groove, and the helical groove and the ball.

[0019] Compared with the prior art, the advantages of this invention are:

[0020] (1) The present invention utilizes the mutual cooperation between a cylinder with an output rod, threaded groove, driven gear, a brake pad assembly with a fixed plate, rotating slide rail, rotating seat, brake pad, and clearance hole, and a drive rod with a raised edge, spiral groove, and spline shaft. In actual use, the bracket is snapped onto one side of the brake disc, and the clearance between the brake pad and the end face of the brake disc in the brake pad assembly is manually adjusted to complete the assembly and debugging process. When braking action is required, the cylinder uses hydraulic power to drive the output rod to move, causing the brake pad to contact the end face of the brake disc, thereby increasing the friction braking effect.

[0021] (2) In the prior art, when the brake pads wear out during long-term use, the output rate of the cylinder is constant and the thickness of the brake pads decreases, which increases the contact time between the brake pads and the brake disc, thus increasing the braking distance and reducing safety. In the present invention, when the brake pads wear out, the gap ring will also wear out. When the outer edge of the gap ring is worn out, the inner edge of the hook will detach. At this time, the convex edge will approach the next gap ring under the tension of the tension spring, and the hook inner edge of the next gap ring will form a hooking action with the convex edge. At the same time, the drive rod will be displaced by the tension spring. During the displacement, the helical groove will drive the execution ring with the ball to rotate, and then the drive gear will drive the driven gear to rotate. With the threaded groove and the threaded convex groove, the cylinder will rotate closer to the brake disc. Since the brake pad assembly is assembled on the output rod of the cylinder, the brake pad assembly will move synchronously with the cylinder. Therefore, the worn brake pads and the brake disc can always maintain the initial assembly gap.

[0022] (3) By setting a limit ring with a counter-rotating gear, a limit block and a tension spring, the oil cylinder will not rotate away from the brake disc due to the vibration of the vehicle during operation. At the same time, the drive rod with a raised edge restricts the rotation of the drive gear as long as the gap ring with the raised edge is not worn. Due to the restriction of the drive gear on the driven gear, the oil cylinder will not rotate close to the brake disc due to the vibration of the vehicle, thereby improving the stability and safety of the gap adjustment equipment.

[0023] (4) By designing the thickness and radius of the drive gear, the drive gear can drive the driven gear more effortlessly. When the drive gear moves with the brake pad assembly, the drive gear can always maintain effective meshing with the driven gear. By designing the tension of the tension spring and applying lubricating oil to reduce friction, the displacement resistance of the drive rod is reduced. The whole system is driven by the elastic potential energy stored in the tension spring.

[0024] (5) When the brake pads are worn, the present invention automatically adjusts the distance between the brake pads and the brake disc and maintains the initial assembly gap, which can effectively reduce braking time, reduce braking distance and improve braking safety. It has market prospects and is suitable for promotion and application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the exploded structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the caliper housing structure proposed in this invention;

[0028] Figure 4 This is a schematic diagram of the structure of the hydraulic cylinder proposed in this invention;

[0029] Figure 5 This is a schematic diagram of the limiting ring proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the execution ring structure proposed in this invention;

[0031] Figure 7 This is an exploded structural diagram of the brake pad assembly proposed in this invention;

[0032] Figure 8 This is a partial cross-sectional structural diagram of the present invention;

[0033] Figure 9 for Figure 8 Enlarged structural diagram of section A in the middle;

[0034] Figure 10 This is a schematic diagram of the gap ring structure proposed in this invention;

[0035] Figure 11 This is a schematic diagram of the structural movement during gap adjustment in this invention.

[0036] Explanation of the labels in the diagram:

[0037] 1. Brake disc, 2. Brake bracket, 3. Caliper housing, 301. Assembly through hole, 302. Reverse gear groove, 303. Threaded groove, 4. Hydraulic cylinder, 41. Output rod, 401. Limiting slide groove, 402. Threaded protrusion, 403. Driven gear, 403. Limiting ring, 421. Reverse gear, 422. Limiting block, 422. Tension spring, 43. Brake pad assembly, 5. Fixing plate, 51. Rotary slide rail, 511. Rotary seat, 512. Brake pad, 52. Clearance hole, 521. Actuating ring, 6. Ball bearing, 601. Drive gear, 602. Drive rod, 7. Protruding edge, 71. Helical groove, 72. Splined shaft, 73. Clearance ring, 8. Inner edge of the hook, 801. Outer edge of the adhesive, 802. Tension spring, 9. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] This invention discloses a device for adjusting the gap between brake pads and wheel hubs in automobiles. Please refer to [link / reference]. Figure 1-11 The caliper housing includes a bracket 2 that is snapped onto one side of the brake disc 1. Both sides of the bracket 2 are provided with caliper housings 3. Each caliper housing 3 is provided with two sets of symmetrically arranged hydraulic cylinders 4. The caliper housing 3 is provided with a mounting through hole 301 corresponding to the hydraulic cylinder 4. The inner wall of the mounting through hole 301 is provided with a threaded groove 303. The outer wall of the hydraulic cylinder 4 is provided with a threaded protrusion 402 corresponding to the threaded groove 303. The caliper housing 3 is also provided with a limiting device that allows the hydraulic cylinder 4 to rotate in one direction.

[0041] Brake pad assembly 5 is provided inside bracket 2. Brake pad assembly 5 includes fixing plate 51 and brake pad 52 fixed on one side of fixing plate 51. Two sets of symmetrically arranged rotating seats 512 are provided on the side of fixing plate 51 away from brake pad 52. Output rod 41 is provided inside cylinder 4. The end of output rod 41 extends into rotating seat 512 and is rotatably connected to it. Rotary slide rail 511 is provided in the middle of fixing plate 51. Actuating ring 6 is rotatably connected on rotary slide rail 511. Drive gear 602 is provided on the outer circumference of actuating ring 6. One end of cylinder 4 extends through mounting through hole 301 and is fixed with driven gear 403 that meshes with drive gear 602.

[0042] The inner circumference of the actuator ring 6 is provided with a drive rod 7. The outer wall of the drive rod 7 is provided with a number of equally spaced spiral grooves 72. The inner circumference of the actuator ring 6 is provided with balls 601 that match the spiral grooves 72 one by one. One end of the drive rod 7 is fixed with a spline shaft 73. The caliper housing 3 is provided with a spline groove corresponding to the spline shaft 73. A tension spring 9 is fixed between the spline shaft 73 and the spline groove. The other end of the drive rod 7 is fixed with a protrusion 71. The brake pad 52 is provided with a gap hole 521 corresponding to the protrusion 71. A number of gap rings 8 are glued and fixed in the gap hole 521 at equal intervals. The gap ring 8 includes an glued outer edge 802 fixed to the inner wall of the gap hole 521. The inner side of the glued outer edge 802 is fixed with a hooking inner edge 801 for hooking the protrusion 71.

[0043] This invention utilizes the interaction between a hydraulic cylinder 4 with an output rod 41, a threaded groove 402, and a driven gear 403; a brake pad assembly 5 with a fixing plate 51, a rotating slide rail 511, a rotating seat 512, a brake pad 52, and a clearance hole 521; and a drive rod 7 with a raised edge 71, a spiral groove 72, and a splined shaft 73. In actual use, the bracket 2 is snapped onto one side of the brake disc 1, and the clearance between the brake pad 52 in the brake pad assembly 5 and the end face of the brake disc 1 is manually adjusted to complete the assembly and debugging process. When braking is required, the hydraulic cylinder 4 uses hydraulic power to drive the output rod 41 to move, causing the brake pad 52 to contact the end face of the brake disc 1, thereby increasing the friction braking effect.

[0044] In the prior art, when the brake pad 52 wears down during long-term use, the output rate of the cylinder 4 remains constant. With the brake pad 52 thickness decreasing, the contact time between the brake pad 52 and the brake disc 1 increases, leading to a longer braking distance and reduced safety. However, in this invention, when the brake pad 52 wears down, the gap ring 8 also wears down. When the outer adhesive edge 802 of the gap ring 8 wears down, the inner hook edge 801 disengages. At this time, the protruding edge 71, under the tension of the tension spring 9, moves closer to the next gap ring 8 and utilizes the inner hook edge 801 of the next gap ring 8. 01 and the convex edge 71 form a hook-up action. At the same time, the drive rod 7 is displaced by the tension spring 9. During the displacement, the helical groove 72 drives the actuator ring 6 with the ball 601 to rotate. Then, the drive gear 602 drives the driven gear 403 to rotate. With the cooperation of the threaded groove 303 and the threaded protrusion 402, the cylinder 4 performs a rotating action close to the brake disc 1. Since the brake pad assembly 5 is assembled on the output rod 41 of the cylinder 4, the brake pad assembly 5 moves synchronously with the cylinder 4. Therefore, the worn brake pad 52 and the brake disc 1 can always maintain the initial assembly gap.

[0045] It should be noted that in this embodiment, the limiting device includes a limiting ring 42, which is slidably sleeved on one side of the outer wall of the cylinder 4. Several limiting blocks 422 are fixedly arranged at equal angles on the inner side of the limiting ring 42. The outer wall of the cylinder 4 is provided with limiting grooves 401 that correspond one-to-one with the limiting blocks 422. A tension spring 43 is fixed between one side of the limiting ring 42 and the mounting through hole 301. A reversing gear 421 is provided on the other side of the limiting ring 42. One end of the mounting through hole 301 is provided with a reversing tooth groove 302 that matches the reversing gear 421. The two cylinders 4 on the same side have opposite rotational directions, and the rotational actions of the two cylinders 4 in the rotational direction can be approached by the cooperation of the threaded protrusion 402 and the threaded groove 303 to approach the brake disc 1. The tension spring 43 is a high-strength fatigue-resistant spring structure, and the tension spring 43 has the elastic force to drive the limiting ring 42 to approach the reversing tooth groove 302.

[0046] By setting a limiting ring 42 with a reversing gear 421, a limiting block 422, and a tension spring 43, the hydraulic cylinder 4 will not rotate away from the brake disc 1 due to vibrations during vehicle operation. At the same time, the drive rod 7 with a raised edge 71 restricts the rotation of the drive gear 602 as long as the clearance ring 8 with the raised edge 71 is not worn. Due to the restriction of the driven gear 403 by the drive gear 602, the hydraulic cylinder 4 will not rotate closer to the brake disc 1 due to vehicle vibrations, thereby improving the stability and safety of the clearance adjustment equipment.

[0047] It should be noted that in this embodiment, the hydraulic cylinder 4 is connected to the hydraulic output system via a pipeline. A piston matching the hydraulic cylinder 4 is fixed on the output rod 41. The stroke of the output rod 41 under hydraulic drive within the hydraulic cylinder 4 is a fixed value. The tension spring 9 is a high-strength fatigue-resistant spring structure. The tension spring 9 has a pulling force that drives the drive rod 7 away from the brake pad 52. The pulling force of the tension spring 9 is greater than the total friction between the threaded protrusion 402 and the threaded groove 303, and between the helical groove 72 and the ball 601. The single gap ring 8 and the gap hole The bonding force between 521 is greater than the tension of the tension spring 9. A single drive gear 602 simultaneously meshes with the driven gears 403 located on both sides of it. The thickness of the drive gear 602 is greater than the thickness of the driven gear 403 and equal to the initial thickness of the brake pad 52. The diameter of the drive gear 602 is greater than the diameter of the driven gear 403. Lubricating oil is applied between the drive gear 602 and the driven gear 403, the threaded protrusion 402 and the threaded groove 303, and the spiral groove 72 and the ball 601.

[0048] Among them, the diameter of the protruding edge 71 is greater than the diameter of the drive rod 7, the inner diameter of the inner edge 801 is not greater than the diameter of the protruding edge 71, and the structural hardness of the inner edge 801 and the outer edge 802 is less than the structural hardness of the brake disc 1.

[0049] By designing the thickness and radius of the drive gear 602, it is easier for the drive gear 602 to drive the driven gear 403. When the drive gear 602 moves with the brake pad assembly 5, it can always maintain effective meshing with the driven gear 403. By designing the tension of the tension spring 9 and applying lubricating oil to reduce friction, the displacement resistance of the drive rod 7 is reduced. The entire system is driven by the elastic potential energy stored in the tension spring 9.

[0050] This invention automatically adjusts the distance between the brake pad 52 and the brake disc 1 when the brake pad 52 is worn, while maintaining the initial assembly clearance. This can effectively reduce braking time and braking distance, improve braking safety, and has market potential, making it suitable for widespread application.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A kind of automobile brake wheel hub brake pad gap adjusting equipment, including the support (2) of the clamping in brake disc (1) one side, both sides of the support (2) are equipped with caliper housing (3), two groups of symmetrical oil cylinder (4) are equipped on the caliper housing (3), it is characterized in that, The caliper shell (3) is provided with an assembly through hole (301) corresponding to the oil cylinder (4), the inner wall of the assembly through hole (301) is provided with a threaded groove (303), the outer wall of the oil cylinder (4) is provided with a threaded groove (402) corresponding to the threaded groove (303), and the caliper shell (3) is further provided with a limiting device for allowing the oil cylinder (4) to rotate in one direction. The support (2) is provided with a brake pad assembly (5), the brake pad assembly (5) comprises a fixed plate (51) and a brake pad (52) fixed on one side of the fixed plate (51), and the side, away from the brake pad (52), of the fixed plate (51) is provided with two groups of symmetrical rotary seats (512). The middle part of the fixed plate (51) is provided with a rotary slide rail (511), the rotary slide rail (511) is rotatably connected with an execution ring (6), the circumferential outer side of the execution ring (6) is provided with a drive gear (602), and one end of the oil cylinder (4) extends through the assembly through hole (301) and is fixed with a driven gear (403) engaged with the drive gear (602). The circumferential inner side of the execution ring (6) is provided with a drive rod (7), the outer wall of the drive rod (7) is provided with a plurality of equiangularly and evenly arranged spiral grooves (72), the circumferential inner side of the execution ring (6) is provided with a plurality of balls (601) matched with the spiral grooves (72) one by one, one end of the drive rod (7) is fixed with a spline shaft (73), the caliper shell (3) is provided with a spline groove corresponding to the spline shaft (73), and the spline shaft (73) and the spline groove are fixed with a tension spring (9). The other end of the drive rod (7) is fixed with a convex edge (71), the brake pad (52) is provided with a gap hole (521) corresponding to the convex edge (71), a plurality of gap rings (8) are evenly and equidistantly glued and fixed in the gap hole (521), and the gap ring (8) comprises a glued outer edge (802) fixed with the inner wall of the gap hole (521).

2. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 1, wherein The limiting device comprises a limiting ring (42), the limiting ring (42) is slidably sleeved on one side of the outer wall of the oil cylinder (4), a plurality of limiting blocks (422) are equiangularly arranged and fixed on the inner side of the limiting ring (42), the outer wall of the oil cylinder (4) is provided with a limiting sliding groove (401) corresponding to the limiting block (422) one by one, the limiting ring (42) is fixed with a tension spring (43) between one side and the assembly through hole (301), the other side of the limiting ring (42) is provided with a reverse gear (421), and one end of the assembly through hole (301) is provided with a reverse gear slot (302) matched with the reverse gear (421).

3. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 2, wherein The rotatable directions of the two oil cylinders (4) on the same side are opposite, and the rotation of the two oil cylinders (4) in the rotatable direction can be close to the brake disc (1) by the cooperation of the screw convex groove (402) and the screw concave groove (303).

4. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 2, wherein The tension spring (43) is a high-strength fatigue-resistant spring structure, and has an elastic force for driving the limiting ring (42) to be close to the reverse tooth groove (302).

5. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 1, wherein The oil cylinder (4) is connected to a hydraulic output system through a pipeline, and the output rod (41) is fixed with a piston matched with the oil cylinder (4), and the stroke of the output rod (41) under the hydraulic drive of the oil cylinder (4) is a fixed value.

6. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 1, wherein The tension spring (9) is a high-strength fatigue-resistant spring structure, and has a tension force for driving the driving rod (7) to be away from the brake pad (52).

7. A brake pad clearance adjustment device for a vehicle brake hub as defined in claim 6 wherein, The tension force of the tension spring (9) is greater than the total friction force between the screw convex groove (402) and the screw concave groove (303), the helical groove (72) and the ball (601), and the adhesive force between the single gap ring (8) and the gap hole (521) is greater than the tension force of the tension spring (9).

8. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 1, wherein The diameter of the convex edge (71) is greater than the diameter of the driving rod (7), the inner diameter of the hanging inner edge (801) is not greater than the diameter of the convex edge (71), and the structural hardness of the hanging inner edge (801) and the adhesive outer edge (802) is less than the structural hardness of the brake disc (1).

9. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 1, wherein The single driving gear (602) is engaged with the driven gears (403) arranged on both sides thereof at the same time, the thickness of the driving gear (602) is greater than the thickness of the driven gear (403), and is equal to the thickness of the brake pad (52) in the initial state.

10. The apparatus for adjusting the gap of a brake pad of a brake hub of an automobile according to claim 9, wherein The diameter of the driving gear (602) is greater than the diameter of the driven gear (403), and the driving gear (602) and the driven gear (403), the screw convex groove (402) and the screw concave groove (303), and the helical groove (72) and the ball (601) are coated with lubricating oil.

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