Clearance self-adjusting mechanism of disc brake

Abstract

The invention provides a clearance self-adjusting mechanism of a disc brake, and belongs to the technical field of braking. The problem that uncontrolled change of the brake clearance is prone to occurring when a vehicle runs in a bumpy mode is solved. The device comprises a supporting seat and a driving adjusting rotating shaft, a driving gear is fixedly connected outside the driving adjusting rotating shaft, an intermediate gear is connected to the supporting seat, the driving gear is meshed with the intermediate gear, the supporting seat is sleeved with an annular connecting piece, the supporting seat and the annular connecting piece are fixed, the intermediate gear is sleeved outside the connecting piece, and a first mounting groove is formed in the side portion of the connecting piece. A plurality of first positioning notches which are continuously distributed are formed in the inner circumferential face of the intermediate gear, a limiting piece is fixed in the first mounting groove and comprises a sheet-shaped first elastic arm, the first elastic arm extends out of the first mounting groove, the end, extending out of the first mounting groove, of the first elastic arm is bent to form a limiting part, and the limiting part is inserted into one first positioning notch. The invention has the advantages that the brake clearance cannot be changed uncontrollably, the production is convenient, and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of braking and relates to a clearance self-adjusting mechanism of a disc brake. Background Art

[0002] Disc brakes are a common type of brake in mid-to-high-end commercial vehicles. The two brake pads in the brake are respectively set on both sides of the brake disc. The two brake pads are pressed on the brake disc and braked by friction. Because the brake is achieved by friction, the brake pads will wear out after long-term use, so the brake clearance between the brake pads and the brake disc will increase. Moreover, as the brake clearance increases, the preparation time for braking will be extended. Therefore, existing disc brakes are equipped with a clearance self-adjusting mechanism to achieve automatic adjustment of the brake clearance.

[0003] For example, a clearance adjustment mechanism of a disc brake disclosed in patent application No. 202223365841.1 includes a bottom cover and a clearance adjustment component matched with the bottom cover, the clearance adjustment component includes a reference seat, a fulcrum cylinder and a pressure arm, an adjustment sleeve, an active sleeve and an active adjustment rod are arranged on one side of the pressure arm, a driven sleeve and a driven adjustment rod are arranged on the other side of the pressure arm, a pull pin is fixed on the side of the pressure arm, the adjustment sleeve is arranged on the active sleeve and an adjustment groove matched with the pull pin is arranged on the side of the active adjustment rod One end is threadedly connected with the active sleeve, one end of the driven adjusting rod is threadedly connected with the driven sleeve, the other end of the active adjusting rod and the other end of the driven adjusting rod respectively penetrate the two circular through holes on the bottom cover and are connected with the push plate, the active sleeve and the driven sleeve are both axially fixed on the reference seat, the active sleeve is equipped with a driving gear and the two are fixed, the driven sleeve is equipped with a driven gear and the two are fixed, the reference seat is equipped with an intermediate gear and the intermediate gear can rotate relative to the reference seat, and the intermediate gear is meshed between the active gear and the driven gear. When the brake clearance is automatically adjusted, the pressure arm drives the active sleeve to rotate through the adjustment sleeve, the active sleeve drives the intermediate gear to rotate through the active gear, and the intermediate gear drives the driven gear and the driven sleeve to rotate. Due to the limit relationship, the active adjusting rod threadedly connected with the active sleeve and the driven adjusting rod threadedly connected with the driven sleeve move axially outward synchronously along the thread, thereby pushing the brake block to move through the push plate to reduce the gap between the brake block and the brake disc.

[0004] After the brake clearance is adjusted, it is required that it will not change again before the brake pads are further worn. However, because the intermediate gear is usually sleeved and positioned on the reference seat, when the vehicle is driving on a long bumpy road, the entire disc brake will produce violent vibrations, which will cause the intermediate gear to rotate uncontrollably and in turn drive the driving gear and the driven gear to rotate, thus causing the already adjusted brake clearance to change uncontrollably.

[0005] At present, in order to solve the problem of uncontrolled change of brake clearance in the clearance self-adjusting mechanism of the existing disc brake when the vehicle is bumpy, the conventional technical solution is to add damping ester between the intermediate gear and the support seat. Summary of the invention

[0006] The purpose of the present invention is to address the above problems existing in the prior art and to propose a clearance self-adjusting mechanism for a disc brake, thereby solving the problem of uncontrolled changes in the brake clearance when the vehicle is bumpy.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A disc brake clearance self-adjusting mechanism comprises a support seat and an active adjustment shaft passing through the support seat and fixed thereto in the axial direction, the active adjustment shaft is fixedly connected to a driving gear outside, the support seat is connected to an intermediate gear that can rotate relative to the active adjustment shaft, the driving gear meshes with the intermediate gear, and is characterized in that an annular connecting member is sleeved on the support seat and the two are fixed, the intermediate gear is sleeved outside the connecting member, a mounting groove is provided on the side of the connecting member, a plurality of continuously distributed positioning recesses are provided along the inner circumference of the intermediate gear, a limiting member is fixed in the mounting groove, the limiting member comprises a sheet-shaped first elastic arm, the first elastic arm extends out of the mounting groove, and the end of the first elastic arm extending out of the mounting groove is bent to form a limiting portion, the limiting portion is inserted into one of the positioning recesses, and when the intermediate gear is driven by the driving gear to rotate, the elastic force of the first elastic arm can be overcome to squeeze the limiting portion into the mounting groove.

[0009] During the driving of the vehicle, the clearance self-adjusting mechanism is not working. By setting a mounting groove 1 on the side of the connecting member and setting a plurality of continuously distributed positioning notches 1 on the inner circumference of the intermediate gear, a limiting member is fixed in the mounting groove 1, and the first elastic arm of the limiting member extends out of the mounting groove 1, and the end of the first elastic arm extending out of the mounting groove 1 is bent to form a limiting portion and embedded in the corresponding positioning notch 1, so that the elastic force of the first elastic arm can stably act on the intermediate gear through the cooperation of the limiting portion and the positioning notch 1, and the elastic force can form an effective damping force for the rotation of the intermediate gear to position the intermediate gear in the bumpy driving state of the vehicle, ensuring that the intermediate gear will not rotate outside of work, and the positioning of the intermediate gear is equivalent to fixing the active gear and the active adjustment shaft fixed thereto, thereby ensuring that the adjusted brake clearance will not change uncontrollably. When the clearance self-adjusting mechanism is working, the torque transmitted by the driving gear to the intermediate gear is large enough, so that during the rotation of the intermediate gear, the elastic force of the first elastic arm can be easily overcome to squeeze the limiting part and press it into the installation groove 1. After the brake clearance is adjusted, the first elastic arm re-embeds the limiting part into the positioning notch 1 corresponding to the current position under the action of its own elastic force.

[0010] The first installation groove is arranged on the side of the connecting member instead of being arranged directly on the support seat, and the connecting member is separately sleeved and fixed to the support seat, so that the structure of the support seat itself does not need to be greatly changed, and it is only necessary to separately process the annular connecting member and process the first installation groove on its side, which is more convenient for production and manufacturing. In particular, when the intermediate gear rotates, the limiting part is completely pressed into the first installation groove, which is equivalent to the inner peripheral surface of the intermediate gear being supported by the outer peripheral surface of the connecting member all the time, and the rotation stability and power transmission of the intermediate gear are not affected. In addition, in the present self-adjusting mechanism, a limiting part including a sheet-shaped first elastic arm is used, which can ensure the effective positioning of the intermediate gear when the vehicle is bumpy, and at the same time, its structure is simpler and the cost is lower.

[0011] In the above-mentioned clearance self-adjusting mechanism of the disc brake, the limiting portion protrudes in an arc shape in a direction away from the center line of the connecting member.

[0012] The arc shape can make the intermediate gear more smoothly squeeze the limit part into the installation groove 1 when the clearance self-adjusting mechanism is working, avoiding the situation that the limit part is directly squeezed and deformed and causes the limit part to be stuck in the positioning recess 1. In particular, such a shape ensures that no matter which direction the intermediate gear rotates, it can smoothly overcome the effect of the first elastic arm to squeeze the limit part.

[0013] In the above-mentioned self-adjusting mechanism of the clearance of a disc brake, the limiting member also includes a second elastic arm in the form of a sheet, the first elastic arm and the second elastic arm are integrally connected in a "∠" shape, and the second elastic arm is positioned in the first installation groove along its length direction and the connection between the first elastic arm and the second elastic arm.

[0014] The first elastic arm and the second elastic arm are integrally connected in a "∠" shape, which is equivalent to the entire limiter being directly formed by bending a metal sheet during production. The second elastic arm is positioned in the first installation groove along its length direction and the connection between the first elastic arm and the second elastic arm, so that when the intermediate gear rotates and applies a force to the limiter, the limiter will not shift, so that the limiter can be pressed into the first installation groove to separate it from the positioning notch.

[0015] In the above-mentioned clearance self-adjusting mechanism of a disc brake, the installation groove 1 is set through along the thickness direction of the intermediate gear, and the width of the installation groove 1 at the notch position is smaller than the internal width of the installation groove 1.

[0016] During actual installation, the limit piece can be directly inserted into the installation groove one along the thickness direction of the intermediate gear, and the limit part of the first elastic arm will naturally extend out of the installation groove one, so that the limit piece can be positioned in the installation groove one without falling out of the installation groove one. This can play a great role in the installation gap self-adjusting mechanism, and there is no need to consider how to ensure that the limit piece does not fall out when the intermediate gear is sleeved on the outside of the connecting piece.

[0017] In the above-mentioned clearance self-adjusting mechanism of the disc brake, the number of the positioning notches 1 is the same as the number of teeth on the outer side of the intermediate gear, and each positioning notch 1 corresponds to the position of each tooth on the outer side of the intermediate gear.

[0018] The number of positioning notches 1 is the same as the number of teeth on the outside of the intermediate gear, and each positioning notch 1 corresponds to the position of each tooth on the outside of the intermediate gear. In this way, no matter how much the intermediate gear rotates during operation, there will be a corresponding positioning notch 1 for the limiting portion of the first elastic arm to be embedded in to form a positioning.

[0019] In the above-mentioned clearance self-adjusting mechanism of the disc brake, the first positioning notch is an arc-shaped notch, and the curvature of the limiting portion is greater than that of the first positioning notch.

[0020] The curvature of the limiting part is greater than that of the positioning notch 1, which means that the limiting part is not completely attached to the inner wall of the positioning notch 1, but there is a gap. The existence of the gap enables the intermediate gear to rotate under the drive of the driving gear and to more smoothly press the limiting part into the installation groove 1 to overcome the elastic force of the first elastic arm, thereby avoiding the situation of being stuck.

[0021] In the above-mentioned clearance self-adjusting mechanism of a disc brake, the number of the above-mentioned mounting grooves 1 is at least two, and the above-mentioned limiting member is arranged in each mounting groove 1.

[0022] The provision of at least two limiting members can achieve a better positioning effect on the intermediate gear when the vehicle is bumpy, and can better ensure that the brake clearance will not undergo uncontrollable changes.

[0023] In the above-mentioned self-adjusting mechanism of the disc brake, the thickness of the connecting member is the same as that of the intermediate gear, and gaskets are respectively arranged on both sides of the connecting member. Both gaskets protrude radially from the connecting member, and the intermediate gear abuts between the two gaskets.

[0024] On the basis of setting the thickness of the connecting piece to be the same as that of the intermediate gear, gaskets are respectively set on both sides of the connecting piece, and the two gaskets both protrude radially from the connecting piece, so that the parts of the two gaskets extending out of the connecting piece will respectively abut on both sides of the intermediate gear. Through such a setting, the intermediate gear is positioned so that it will not move along the thickness direction; at the same time, the installation groove one will be closed by the two gaskets along the thickness direction of the intermediate gear, so that it can be ensured that no impurities enter the installation groove one and jam the first elastic arm, thereby making it impossible for the limit part to be pressed into the installation groove one normally.

[0025] Similarly, the two gaskets can be used to block the limiter to ensure that the limiter will not be shaken out of the installation groove when the vehicle is bumpy.

[0026] A disc brake clearance self-adjusting mechanism comprises a support seat and an active adjustment shaft passing through the support seat and fixed thereto in the axial direction, the active adjustment shaft is fixedly connected to a driving gear outside the active adjustment shaft, the support seat is connected to an intermediate gear that can rotate relative to the active adjustment shaft, the driving gear meshes with the intermediate gear, and is characterized in that an annular connecting member is sleeved on the support seat and the two are fixed, the intermediate gear is sleeved outside the connecting member, the inner circumferential wall of the intermediate gear is provided with a second mounting groove, the connecting member is provided with a plurality of continuously distributed second positioning recesses along its outer circumferential surface, a limiting member is fixed in the second mounting groove, the limiting member comprises a first elastic arm in the form of a sheet, the first elastic arm extends out of the second mounting groove, and the end of the first elastic arm extending out of the second mounting groove is bent to form a limiting portion, the limiting portion is inserted into one of the second positioning recesses, and when the intermediate gear is driven by the active gear to rotate, the connecting member can overcome the elastic force of the first elastic arm to squeeze the limiting portion into the second mounting groove.

[0027] During the driving of the vehicle, the clearance self-adjusting mechanism is not working. By setting the second installation groove on the inner peripheral wall of the intermediate gear and setting a plurality of continuously distributed positioning recesses along the outer peripheral surface of the connecting member, a limiting member is fixed in the second installation groove, and the first elastic arm of the limiting member extends out of the second installation groove, and the end of the first elastic arm extending out of the second installation groove is bent to form a limiting portion and embedded in the corresponding positioning recess, so that the elastic force of the first elastic arm can stably act on the intermediate gear through the cooperation of the limiting portion and the second positioning recess, and the elastic force can form an effective damping force for the rotation of the intermediate gear to position the intermediate gear in the bumpy driving state of the vehicle, ensuring that the intermediate gear will not rotate outside of work, and the positioning of the intermediate gear is equivalent to fixing the active gear and the active adjustment shaft fixed thereto, thereby ensuring that the adjusted brake clearance will not change uncontrollably. When the clearance self-adjusting mechanism is working, the torque applied to the intermediate gear is large enough, so that during the rotation of the intermediate gear, it can easily overcome the elastic force of the first elastic arm and squeeze the limit part and press it into the second mounting groove. After the brake clearance is adjusted, the first elastic arm uses its own elastic force to re-embed the limit part into the second positioning recess corresponding to the current position.

[0028] The second positioning notch is arranged on the side of the connecting piece instead of being directly arranged on the support seat, and the connecting piece is separately sleeved and fixed to the support seat, so that the structure of the support seat itself does not need to be greatly changed, and it is only necessary to separately process the annular connecting piece and process the second positioning notch on its side, which is more convenient for production and manufacturing. In particular, when the intermediate gear rotates, the limiting part is completely pressed into the second mounting groove, which is equivalent to the inner peripheral surface of the intermediate gear being supported by the outer peripheral surface of the connecting piece, and the rotation stability and power transmission of the intermediate gear are not affected. In addition, in the present self-adjusting mechanism, a limiting part including a sheet-shaped first elastic arm is used, which can ensure the effective positioning of the intermediate gear when the vehicle is bumpy, and at the same time, its structure is simpler and the cost is lower.

[0029] Compared with the prior art, the clearance main adjustment mechanism of the disc brake has the following advantages:

[0030] 1. By providing a mounting groove 1 on the side of the connecting member and providing a plurality of continuously distributed positioning recesses 1 on the inner circumference of the intermediate gear, a limiting member is fixed in the mounting groove 1, and a limiting portion at the end of the first elastic arm of the limiting member is inserted into the corresponding positioning recess 1, so that the elastic force of the first elastic arm can stably act on the intermediate gear through the cooperation between the limiting portion and the positioning recess 1, and the elastic force can form an effective damping force for the rotation of the intermediate gear to position the intermediate gear in a bumpy driving state of the vehicle, ensuring that the intermediate gear will not rotate outside of work, thereby ensuring that the adjusted brake clearance will not change uncontrollably;

[0031] 2. The mounting groove 1 is arranged on the side of the connecting piece instead of being directly arranged on the supporting seat, and the connecting piece is separately sleeved and fixed to the supporting seat. In this way, no major changes are required to the structure of the supporting seat itself. It is only necessary to separately process the annular connecting piece and process the mounting groove 1 on its side, which is more convenient for production and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of the clearance self-adjusting mechanism of the disc brake in the first embodiment.

[0033] Figure 2 yes Figure 1 Sectional view along AA direction.

[0034] Figure 3 yes Figure 2 An enlarged view of one of the stoppers.

[0035] Figure 4 It is a three-dimensional schematic diagram of the connecting piece in the first embodiment.

[0036] Figure 5 It is a three-dimensional schematic diagram of the intermediate gear in the first embodiment.

[0037] Figure 6 yes Figure 1 A partial enlarged view of point B in the middle.

[0038] In the figure, 1, support seat; 2, active adjustment shaft; 3, active gear; 4, intermediate gear; 4a, positioning notch 1; 5, driven adjustment shaft; 6, driven gear; 7, adjustment screw; 8, push plate; 9, synchronization rod; 10, connecting piece; 10a, mounting groove 1; 11, limiting piece; 11a, first elastic arm; 11a1, limiting part; 11b, second elastic arm; 12, gasket. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] Embodiment 1

[0041] like Figure 1 and Figure 2 As shown, a clearance self-adjusting mechanism of a disc brake comprises a support seat 1 and an active adjustment shaft 2 and a driven adjustment shaft 5 which both pass through the support seat 1 and are fixed to the support seat 1 in the axial direction. The active adjustment shaft 2 is parallel to the driven adjustment shaft 5. One end of the active adjustment shaft 2 is externally fixedly connected to a driving gear 3. The support seat 1 is connected to an intermediate gear 4 which can rotate relative to the active adjustment shaft 2. One end of the driven adjustment shaft 5 is externally fixedly connected to a driven gear 6. The driving gear 3 and the driven gear 6 are simultaneously meshed with the intermediate gear 4. The meshing of the intermediate gear 4 in the middle enables the driving gear and the driven gear 6 to rotate synchronously in the same direction. The active adjustment shaft 2 and the driven adjustment shaft 5 are both threadedly connected to an adjustment screw 7. One end of the two adjustment screws 7 are respectively extended and respectively connected to a push plate 8. A synchronization rod 9 is also connected between the two adjustment screws 7. The two push plates 8 are simultaneously abutted against one of the brake blocks in the disc brake. Of course, a push plate can also be directly connected between the two adjustment screws 7 so that the push plate abuts against the brake block.

[0042] The working principle of the clearance self-adjusting mechanism of the present disc brake is the same as that of the prior art when the brake clearance is automatically adjusted. When the brake pad is worn and the brake clearance increases, the active adjustment shaft 2 receives power to rotate and transmits the power synchronously to the intermediate gear 4 through the active gear 3. The intermediate gear 4 transmits the power synchronously to the driven gear 6 so that the driven adjustment shaft 5 rotates synchronously in the same direction as the active adjustment shaft 2. In this way, the two adjustment screws 7 will extend at the same time and push the brake pad close to the brake disc to reduce the brake clearance. After replacing the new brake pad, the active adjustment shaft 2 is manually rotated in the opposite direction using a tool. Through the transmission of the intermediate gear 4, the driven adjustment shaft 5 also rotates synchronously in the opposite direction with the active adjustment shaft 2. In this way, the two adjustment screws 7 will retract at the same time. In other words, the intermediate gear 4 is required to be able to rotate in both directions.

[0043] Furthermore, if Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a ring-shaped connecting member 10 is sleeved on the support seat 1 and the two are fixed, and the intermediate gear 4 is sleeved outside the connecting member 10. A mounting groove 10a is provided on the side of the connecting member 10, and a plurality of continuously distributed positioning notches 4a are provided along the inner circumference of the intermediate gear 4, and a limiting member 11 is fixed in the mounting groove 10a. The limiting member 11 is a metal member, and the limiting member 11 includes a sheet-shaped first elastic arm 11a, the first elastic arm 11a extends out of the mounting groove 10a, and the end of the first elastic arm 11a extending out of the mounting groove 10a is bent to form a limiting portion 11a1, the first elastic arm 11a is inclined relative to the notch of the mounting groove 10a, and the limiting portion 11a1 is inserted into one of the positioning notches 4a, and when the intermediate gear 4 is driven by the driving gear to rotate, the elastic force of the first elastic arm 11a can be overcome to squeeze the limiting portion into the mounting groove 1. The limiting member 11 also includes a second elastic arm 11b in the form of a sheet. The first elastic arm 11a and the second elastic arm 11b are integrally connected in a "∠" shape. The second elastic arm 11b is positioned in the installation groove 10a along its length direction and the connection between the first elastic arm 11a and the second elastic arm 11b. In practice, the limiting portion 11a1 protrudes in an arc shape in the direction away from the center line of the connecting member 10. The number of the positioning notches 14a is the same as the number of teeth on the outer side of the intermediate gear 4, and each positioning notch 14a corresponds to the position of each tooth on the outer side of the intermediate gear 4. The number of the installation grooves 10a is at least two, and the above-mentioned limiting member 11 is arranged in each installation groove 10a. The positioning notch 14a is actually also an arc notch, but the curvature of the limiting portion 11a1 is greater than the curvature of the positioning notch 14a.

[0044] When the vehicle is running, the clearance self-adjusting mechanism does not work. By providing a mounting groove 10a on the side of the connecting member 10 and providing a plurality of continuously distributed positioning recesses 4a on the inner circumference of the intermediate gear 4, a limiting member 11 is fixed in the mounting groove 10a, and a first elastic arm 11a of the limiting member 11 extends out of the mounting groove 10a. The end of the first elastic arm 11a extending out of the mounting groove 10a is bent to form a limiting portion 11a1 and embedded in the corresponding positioning recess 4a. In this way, the elastic force of the first elastic arm 11a can stably act on the intermediate gear 4 through the cooperation between the limiting portion 11a1 and the positioning recess 4a. The elastic force can form an effective damping force on the rotation of the intermediate gear 4 and position the intermediate gear 4 when the vehicle is bumpy, ensuring that the intermediate gear 4 will not rotate outside of work. The positioning of the intermediate gear 4 is equivalent to fixing the active gear 3 and the active adjustment shaft 2 fixed thereto, thereby ensuring that the adjusted brake clearance will not change uncontrollably. When the clearance self-adjusting mechanism is working, the torque applied to the intermediate gear 4 is large enough, so that during the rotation of the intermediate gear 4, it can easily overcome the elastic force of the first elastic arm 11a and squeeze the limiting portion 11a1 and press it into the installation groove 10a. After the brake clearance is adjusted, the first elastic arm 11a uses its own elastic force to re-embed the limiting portion 11a1 into the positioning recess 4a corresponding to the current position.

[0045] The mounting groove 10a is arranged on the side of the connecting member 10 instead of being directly arranged on the support seat 1, and the connecting member 10 is separately sleeved and fixed on the support seat 1, so that the structure of the support seat 1 itself does not need to be greatly changed, and it is only necessary to separately process the annular connecting member 10 and process the mounting groove 10a on its side, which is more convenient for production and manufacturing. In particular, when the intermediate gear 4 rotates, the limiting part 11a1 is completely pressed into the mounting groove 10a, which is equivalent to the inner peripheral surface of the intermediate gear 4 The entity part is always supported by the outer peripheral surface of the connecting member 10, and the rotation stability and power transmission of the intermediate gear 4 are not affected. In addition, in the present self-adjusting mechanism, a limiting member 11 including a sheet-shaped first elastic arm 11a is used, which can not only ensure the effective positioning of the intermediate gear 4 when the vehicle is bumpy, but also has a simpler structure and lower cost.

[0046] In this embodiment, if Figure 4 and Figure 6As shown, the installation groove 10a is also set through along the thickness direction of the middle gear 4, and the width of the notch position of the installation groove 10a is smaller than the internal width of the installation groove 10a. This arrangement allows the limiter 11 to be positioned in the installation groove 10a without falling out of the installation groove 10a. During actual installation, the limiter 11 can be directly inserted into the installation groove 10a along the thickness direction of the middle gear 4. The thickness of the connecting member 10 is the same as that of the middle gear 4. Gaskets 12 are respectively set against the two sides of the connecting member 10. Both gaskets 12 protrude radially from the outside of the connecting member 10, and the middle gear 4 also rests between the two gaskets 12. On the basis that the thickness of the connecting member 10 is set to be the same as that of the intermediate gear 4, gaskets 12 are respectively set on both sides of the connecting member 10, and the two gaskets 12 both protrude radially from the connecting member 10, so that the parts of the two gaskets 12 extending out of the connecting member 10 will respectively abut on both sides of the intermediate gear 4. Through such a setting, the intermediate gear 4 is positioned so that it will not move along the thickness direction; at the same time, the installation groove 10a will be closed by the two gaskets 12 along the thickness direction of the intermediate gear 4, so as to ensure that no impurities will enter the installation groove 10a during the assembly process and affect the normal action of the first elastic arm 11a.

[0047] Embodiment 2

[0048] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the inner circumferential wall of the intermediate gear 4 is no longer provided with the above-mentioned positioning notch 1 4a and the outer side of the connecting member 10 is no longer provided with the above-mentioned mounting groove 1 10a, but a mounting groove 2 is provided on the inner circumferential wall of the intermediate gear 4, and the connecting member 10 is provided with a plurality of continuously distributed positioning notches 2 along its outer circumferential surface, and the limiting member 11 is fixed in the mounting groove 2, and the limiting portion 11a1 formed at the end of the first elastic arm 11a is in shape matching the positioning notch 2, and the limiting portion 11a1 extends out of the mounting groove 2 and is inserted into one of the positioning notches 2, and when the intermediate gear 4 is driven by the driving gear 3 to rotate, the connecting member 10 can overcome the elastic force of the first elastic arm 11a and squeeze the limiting portion 11a1 into the mounting groove 2. Among them, the positioning notch 2 is arc-shaped, and the curvature of the limiting portion 11a1 is greater than the curvature of the positioning notch 2, and the number of the positioning notches 2 4a is the same as the number of teeth on the outer side of the intermediate gear 4.

[0049] During the driving of the vehicle, the clearance self-adjusting mechanism is not working. By setting the second installation groove on the inner peripheral wall of the intermediate gear 4 and setting a plurality of continuously distributed positioning recesses 2 on the outer peripheral surface of the connecting member 10, a limiting member 11 is fixed in the second installation groove, and the first elastic arm 11a of the limiting member 11 extends out of the second installation groove, and the end of the first elastic arm 11a extending out of the second installation groove is bent to form a limiting portion 11a1 and embedded in the corresponding positioning recess 2, so that the elastic force of the first elastic arm 11a can stably act on the intermediate gear 4 through the cooperation of the limiting portion 11a1 and the second positioning recess, and the elastic force can form an effective damping force on the rotation of the intermediate gear 4 and position the intermediate gear 4 in the bumpy driving state of the vehicle, ensuring that the intermediate gear 4 will not rotate outside of work, and the positioning of the intermediate gear 4 is equivalent to fixing the driving gear 3 and the adjustment shaft 2 fixed thereto, thereby ensuring that the adjusted brake clearance will not change uncontrollably. When the clearance self-adjusting mechanism is working, the torque applied to the intermediate gear 4 is large enough, so that during the rotation of the intermediate gear 4, it can easily overcome the elastic force of the first elastic arm 11a and squeeze the limiting part 11a1 and press it into the second mounting groove. After the brake clearance is adjusted, the first elastic arm 11a uses its own elastic force to re-embed the limiting part 11a1 into the second positioning recess corresponding to the current position.

[0050] The second positioning notch is arranged on the side of the connecting member 10 instead of being directly arranged on the support seat 1, and the connecting member 10 is separately sleeved and fixed to the support seat 1, so that the structure of the support seat 1 itself does not need to be greatly changed, and it is only necessary to process the annular connecting member 10 separately and process the second positioning notch on its side, which is more convenient for production and manufacturing. In particular, when the intermediate gear 4 rotates, the limiting portion 11a1 is completely pressed into the second installation groove, which is equivalent to the inner peripheral surface of the intermediate gear 4 The solid part is always supported by the outer peripheral surface of the connecting member 10, and the rotation stability and power transmission of the intermediate gear 4 are not affected. In addition, in the present self-adjusting mechanism, a limiting member 11 including a sheet-shaped first elastic arm 11a is used, which can not only ensure the effective positioning of the intermediate gear 4 when the vehicle is bumpy, but also has a simpler structure and lower cost.

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A self-adjusting mechanism for a disc brake, comprising a support seat (1) and an active adjustment shaft (2) passing through the support seat (1) and fixed to the support seat in the axial direction, wherein the active adjustment shaft (2) is externally fixedly connected to a driving gear (3), and the support seat (1) is connected to an intermediate gear (4) capable of rotating relative to the support seat, and the driving gear (3) is meshed with the intermediate gear (4), characterized in that: The support seat (1) is sleeved with a ring-shaped connecting piece (10) and the two are fixed to each other. The intermediate gear (4) is sleeved outside the connecting piece (10). The side of the connecting piece (10) is provided with a mounting groove (10a). The intermediate gear (4) is provided with a plurality of continuously distributed positioning notches (4a) along its inner circumference. A limiting piece (11) is fixed in the mounting groove (10a). The limiting piece (11) includes a first elastic arm (11a) in the form of a sheet, and a first elastic arm (11a) in the form of a sheet. An elastic arm (11a) extends out of the mounting groove (10a), and the end of the first elastic arm (11a) extending out of the mounting groove (10a) is bent to form a limiting portion (11a1). The limiting portion (11a1) is inserted into one of the positioning recesses (4a). When the intermediate gear (4) is driven by the driving gear (3) to rotate, the elastic force of the first elastic arm (11a) can be overcome to squeeze the limiting portion (11a1) into the mounting groove (10a).

2. The clearance self-adjusting mechanism of the disc brake according to claim 1, characterized in that: The limiting portion (11a1) protrudes in an arc shape in a direction away from the center line of the connecting member (10).

3. The clearance self-adjusting mechanism of the disc brake according to claim 2, characterized in that: The limiting member (11) further comprises a second elastic arm (11b) in the form of a sheet, the first elastic arm (11a) and the second elastic arm (11b) are integrally connected to form a "∠" shape, and the second elastic arm (11b) along its length direction and the connection between the first elastic arm (11a) and the second elastic arm (11b) are both positioned in the installation groove 1 (10a).

4. The clearance self-adjusting mechanism of the disc brake according to claim 3, characterized in that: The installation groove 1 (10a) is arranged to penetrate along the thickness direction of the intermediate gear (4), and the width of the installation groove 1 (10a) at the groove position is smaller than the internal width of the installation groove 1 (10a).

5. The clearance self-adjusting mechanism of the disc brake according to claim 1, 2, 3 or 4, characterized in that: The number of the positioning notches (4a) is the same as the number of teeth on the outer side of the intermediate gear (4), and the position of each positioning notch (4a) corresponds to that of each tooth on the outer side of the intermediate gear (4).

6. The clearance self-adjusting mechanism of the disc brake according to claim 2, characterized in that: The positioning notch 1 (4a) is an arc-shaped notch, and the curvature of the limiting portion (11a1) is greater than that of the positioning notch 1 (4a).

7. The self-adjusting clearance mechanism of a disc brake according to claim 1, 2, 3 or 4, characterized in that: The number of the installation grooves (10a) is at least two, and the above-mentioned limiting member (11) is arranged in each installation groove (10a).

8. The clearance self-adjusting mechanism of a disc brake according to claim 1, 2, 3 or 4, characterized in that: The thickness of the connecting member (10) is the same as that of the intermediate gear (4). Gaskets (12) are respectively arranged on both sides of the connecting member (10). Both gaskets (12) protrude radially from the connecting member (10), and the intermediate gear (4) abuts between the two gaskets (12).

9. A self-adjusting mechanism for a disc brake, comprising a support seat (1) and an active adjustment shaft (2) passing through the support seat (1) and fixed to the support seat in the axial direction, wherein the active adjustment shaft (2) is externally fixedly connected to a driving gear (3), and the support seat (1) is connected to an intermediate gear (4) capable of rotating relative to the support seat, and the driving gear (3) is meshed with the intermediate gear (4), characterized in that: The support seat (1) is sleeved with a ring-shaped connecting piece (10) and the two are fixed to each other. The intermediate gear (4) is sleeved outside the connecting piece (10). The inner peripheral wall of the intermediate gear (4) is provided with a second installation groove. The connecting piece (10) is provided with a plurality of continuously distributed positioning recesses along its outer peripheral surface. A limiting piece (11) is fixed in the second installation groove. The limiting piece (11) includes a sheet-shaped first elastic arm (11a). The first elastic arm (11a) extends out of the second installation groove. The end of the first elastic arm (11a) extending out of the second installation groove is bent to form a limiting portion (11a1). The limiting portion (11a1) is inserted into one of the second positioning recesses. When the intermediate gear (4) is driven by the driving gear (3) to rotate, the connecting piece (10) can overcome the elastic force of the first elastic arm (11a) to squeeze the limiting portion (11a1) into the second installation groove.

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