Main adjustment assembly of clearance self-adjusting mechanism in disc brake

Abstract

The present invention provides a main adjustment assembly of a clearance self-adjusting mechanism in a disc brake, and belongs to the technical field of automobile parts. It solves the problem of poor working stability of the existing main adjustment assembly. It includes a main adjustment shaft, an elastic element 1 for realizing the reset of the brake mechanism in the disc brake, and a main adjustment component sleeved on the main adjustment shaft and capable of rotating. A transmission part is fixed circumferentially on the main adjustment shaft, and the transmission part and the main adjustment component are transmitted through friction. An elastic element 2 is provided on the main adjustment shaft, and the elastic element 2 is located in the elastic element 1 and the elastic force directions of the two are the same. A support seat is sleeved on the main adjustment shaft, and the support seat is located on the same side of the elastic element 2 and the elastic element 1. The elastic element 2 acts between the support seat and the transmission part, and the support seat is limited in the direction away from the transmission part. The transmission part and the main adjustment component always have a tendency to be combined under the elastic force of the elastic element 2. It has the advantages of high working stability and long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts, and relates to a clearance self-adjusting mechanism in a disc brake, and in particular to a main adjustment assembly of the clearance self-adjusting mechanism in the disc brake. Background Art

[0002] The clearance self-adjusting mechanism is also known as the brake clearance automatic adjustment mechanism. It is a key module in the disc brake and is used to automatically adjust the excess clearance caused by the wear of the brake pad or brake disc, so that the brake clearance of the disc brake is always kept within the specified range. At present, most of the clearance self-adjusting mechanisms use the method of adjusting the excess clearance when the vehicle is braking, so that the brake clearance reaches the preset clearance. The traditional clearance self-adjusting mechanism mainly includes a main adjustment assembly, two push rods arranged on both sides of the main adjustment assembly, and screw sleeves respectively connected to the push rods by threads, wherein the main adjustment assembly includes a main adjustment shaft, a main adjustment gear arranged on the main adjustment shaft, a pressure plate and a return spring, and the two push rods are respectively fixed with driven gears meshing with the main adjustment gear.

[0003] During braking, the input load acts on the pressure plate, causing the pressure plate to press against the brake disc along with the push rod and the screw sleeve, and the return spring is compressed. At the same time, the corresponding components of the disc brake drive the main adjustment shaft to drive the main adjustment gear to rotate. The main adjustment gear drives the two driven gears to rotate at the same time, thereby causing the two push rods to rotate and drive the two screw sleeves to push out along the thread to achieve automatic adjustment of the brake clearance. After the braking is completed, the input load disappears, and the pressure plate drives the push rod and the screw to reset under the action of the return spring. At the same time, since the main adjustment shaft will reverse at the end of braking, in order to avoid excessive adjustment of the brake clearance, a one-way device is usually set between the main adjustment shaft and the main shaft gear to achieve one-way rotation, thereby ensuring that the main adjustment gear can remain stationary when the main adjustment shaft reverses. In addition, during the process of adjusting the brake clearance, as the screw sleeve continues to press against the brake disc, the rotational resistance acting on the main adjustment gear will become larger and larger. In order to avoid damage to the force-bearing components on the main adjustment assembly, an overload protection device is also required to be set for protection.

[0004] For traditional self-adjusting assemblies, rectangular torsion springs are generally used to simultaneously play the role of a one-way device and an overload protection. However, due to the matching between the rectangular torsion spring and the main adjustment shaft and related parts, as well as the material and torque that are difficult to control, the overload protection effect is very unsatisfactory and the stability is very poor. In view of this situation, another conventional technical means used by those skilled in the art is to use a friction plate assembly as an overload protection device of a clutch structure, and use a return spring to act between the pressure plate and the friction plate assembly to provide friction for the friction plate assembly in the overload protection device, such as a disc brake clearance automatic adjustment device disclosed in patent application No. 201320442847.6, an anti-overload gear linkage brake clearance automatic adjustment mechanism disclosed in patent application No. 201310580548.3, and a pneumatic disc brake clutch adjuster disclosed in patent application No. 201320066104.3.

[0005] However, since the return spring is continuously compressed by the input load during braking and the position of the friction plate assembly remains fixed, the elastic force of the return spring on the friction plate assembly continues to increase, and the friction between the friction plate assemblies also continues to increase, resulting in the overload torque continuing to increase and unable to maintain stability. 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 main adjustment assembly of a clearance self-adjusting mechanism in a disc brake. The technical problem to be solved is how to improve working stability and ensure the service life of the product.

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

[0008] The main adjustment assembly of the clearance self-adjusting mechanism in the disc brake includes a main adjustment shaft, an elastic element 1 for realizing the resetting of the brake mechanism in the disc brake, and a main adjustment component sleeved on the main adjustment shaft and capable of rotating. A transmission part is fixed circumferentially on the main adjustment shaft, and transmission is achieved between the transmission part and the main adjustment component through friction. It is characterized in that an elastic element 2 is provided on the main adjustment shaft, the elastic element 2 is located in the elastic element 1 and the elastic forces of the two are in the same direction, a support seat is sleeved on the main adjustment shaft, the support seat is located on the same side of the elastic element 2 and the elastic element 1, the elastic element 2 acts between the support seat and the transmission part and the support seat is limited in the direction away from the transmission part, and the transmission part and the main adjustment component always have a tendency to combine under the elastic force of the elastic element 2.

[0009] During braking, the corresponding mechanism in the disc brake drives the main adjustment shaft to rotate, and the main adjustment shaft drives the transmission member to rotate. The second elastic element acts on the transmission member or the main adjustment component so that the transmission member and the main adjustment component always have a tendency to combine. Friction is formed between the transmission member and the main adjustment component, so that the transmission member can drive the main adjustment component to rotate, and then the main adjustment component drives other components in the clearance self-adjusting mechanism to automatically adjust the brake clearance. During the adjustment process of the brake clearance, the rotation resistance of other components of the clearance self-adjusting mechanism acting on the main adjustment component gradually increases. At this time, slippage occurs between the transmission member and the main adjustment component, causing the load to be unloaded, thereby protecting the various force-bearing components in the main adjustment assembly from damage, that is, overload protection.

[0010] Compared with the conventional technical means of directly using elastic element 1 to provide force for the combination between the transmission member and the main adjustment component, since the elastic element 1 also plays a role in realizing the resetting of the brake mechanism in the disc brake, it means that the elastic element 1 is in a gradually compressed state under the action of the tensile input load when the main adjustment assembly is working, which makes the force provided by the elastic element 1 continuously increase, and the friction force between the transmission member and the main adjustment component is also continuously increasing accordingly, resulting in the continuous increase of overload torque and the inability to maintain stability. In the present main adjustment assembly, an elastic element 2 is added to provide a force for the connection between the transmission member and the main adjustment component. The elastic element 2 acts between the support seat and the transmission member. The support seat is limited in the direction away from the transmission member, and the transmission member only rotates when the main adjustment assembly is working and does not move axially along the main adjustment shaft. Therefore, it means that the elastic element 2 will not be compressed or relaxed due to the action of other components when the main adjustment assembly is working. In other words, the force provided by the elastic element 2 is constant, so that a constant friction force can be obtained between the transmission member and the main adjustment component, thereby ensuring a constant overload torque, thereby improving the working stability and ensuring the service life.

[0011] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, the elastic element 2 can be compressed, an adjustment head is threadedly connected to the main adjustment shaft, the support seat is located between the elastic element 2 and the adjustment head, and the support seat is against the adjustment head.

[0012] The main adjustment shaft is threadedly connected to the adjustment head, and the support seat is located between the elastic element 2 and the adjustment head. The support seat is against the adjustment head, so when the adjustment head is turned, the elastic element 2 can be compressed or relaxed, that is, the elastic force of the elastic element 2 is adjusted, and the adjustment of the elastic force here is the adjustment of the main adjustment assembly before work. During the adjustment of the brake clearance, the elastic force of the elastic element 2 acting on the transmission part is still constant, so the stability can still be guaranteed. Compared with the direct use of the elastic element 1 to provide an inconstant force, which causes the initial elastic force to be unable to be adjusted or even after adjustment, it will still fluctuate during use, this self-adjusting assembly not only has higher working stability, but also has higher practical value.

[0013] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, the main adjustment component is provided with a pressure plate outside, one end of the elastic element acts on the pressure plate, and the other end of the elastic element acts directly or indirectly on the support seat.

[0014] The pressure plate is arranged outside the main adjustment component. When braking, the input load of the disc brake acts on the pressure plate to press it down. When braking ends and the input load disappears, the pressure plate is reset under the action of the elastic element 1. The other end of the elastic element 1 acts directly or indirectly on the support seat, which is equivalent to using the support seat to support the elastic element 1 and the elastic element 2 at the same time, making the structure more simplified. Although such a setting will adjust the elastic force of the elastic element 1 and the elastic element 2 at the same time when the adjustment head rotates, since the pressure plate is pressed down by the input load, the input load is much greater than the elastic force of the elastic element 1. Therefore, even if the elastic force of the elastic element 1 is increased when adjusting the elastic force of the elastic element 2, it will not cause any impact on the normal downward pressure of the pressure plate.

[0015] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, the elastic element 2 is a coil spring, a columnar positioning portion is provided at the center of the lower end surface of the transmission member, and the upper end of the elastic element 2 is sleeved outside the columnar positioning portion and abuts against the lower end surface of the transmission member.

[0016] The second elastic element is a coil spring, and the upper end of the second elastic element is sleeved on the columnar positioning portion located at the center of the lower end surface of the transmission member, which plays a role in positioning the second elastic element, ensuring that the elastic force of the second elastic element can act on the transmission member more stably and evenly, further ensuring the working stability of the self-adjusting assembly.

[0017] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, the support seat includes a plane bearing and a support plate 1 and a support plate 2 which are sequentially sleeved on the main adjustment shaft, the support plate 1 abuts against the adjustment head and the support plate 2 abuts against the support plate 1, the plane bearing is connected to the outside of the support plate 2, a connecting plate is arranged on the outer sleeve of the support plate 2, the plane bearing is carried between the connecting plate and the support plate 1, the elastic element 1 is a coil spring and its lower end abuts against the connecting plate, and the lower end of the elastic element 2 abuts against the support plate 2.

[0018] The lower end of elastic element one abuts against the connecting plate, and the lower end of elastic element two abuts against the supporting plate two. The connecting plate and the supporting plate two are independent of each other, which ensures that there is no interference between elastic element one and elastic element two, further ensuring working stability.

[0019] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, as another technical solution, the support seat includes a plane bearing and support plate 1 and support plate 2 which are sequentially sleeved on the main adjustment shaft, support plate 1 rests on the adjustment head, the plane bearing is arranged on the main adjustment shaft and supported between support plate 1 and support plate 2, elastic element 1 is a coil spring, and the lower ends of elastic element 1 and elastic element 2 both rest on support plate 2.

[0020] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, the main adjustment component includes an overload protection sleeve, a main adjustment gear and a one-way device located between the overload protection sleeve and the main adjustment gear. The transmission member is located below the overload protection sleeve, and the upper end of the transmission member and the lower end of the overload protection sleeve are always in contact under the action of the elastic element 2.

[0021] During braking, the main adjustment shaft drives the transmission part to rotate, and the transmission part drives the overload protection sleeve to rotate through friction. The overload protection sleeve drives the main adjustment gear to rotate through the action of the one-way device, thereby driving other components in the clearance self-adjusting mechanism to automatically adjust the brake clearance. During the adjustment of the brake clearance, the rotational resistance of other components in the clearance self-adjusting mechanism acting on the main adjustment gear gradually increases. At this time, slippage occurs between the transmission part and the overload protection sleeve, causing the load to be unloaded, thereby protecting the various force-bearing components in the main adjustment assembly. After braking, the corresponding mechanism in the disc brake drives the main adjustment shaft to rotate in the reverse direction, and the main adjustment shaft drives the transmission part to rotate in the reverse direction. The transmission part drives the overload protection sleeve to rotate in the reverse direction under the action of friction. Due to the action of the one-way device, the main adjustment gear no longer rotates at this time, and other components in the clearance self-adjusting mechanism no longer move, thereby ensuring that the brake clearance will not be adjusted excessively.

[0022] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, an annular boss is provided on the outer side of the lower end of the overload protection sleeve, the transmission part is annular, and the upper end face of the transmission part has an annular flange, the lower end of the boss is located inside the upper end of the annular flange and the contact between the two is conical contact or plane contact.

[0023] The transmission member and the overload protection sleeve form transmission through the conical surface contact between the boss and the annular flange. Compared with the plane contact, the conical surface contact has better directionality and stability.

[0024] In the main adjustment assembly of the automatic clearance mechanism of the above-mentioned disc brake, the upper end of the main adjustment shaft has a matching portion protruding radially, and a thrust needle roller bearing is provided outside the upper end of the main adjustment shaft. The thrust needle roller bearing is limited between the lower end surface of the matching portion and the upper end surface of the main adjustment gear.

[0025] Generally speaking, the upper end surface of the main adjustment gear directly abuts against the lower end surface of the matching part to prevent the main adjustment gear from falling out. When the brake is released, the main adjustment shaft reverses, and the main adjustment gear no longer rotates under the action of the one-way device. However, due to the contact between the matching part and the main adjustment gear, there is friction between the two, and the force of the main adjustment shaft rotation is relatively large, so it may react to the one-way device through the main adjustment gear, causing damage to the one-way device.

[0026] In this main adjustment assembly, a thrust needle roller bearing is arranged on the upper end of the main adjustment shaft, and the thrust needle roller bearing is limited between the lower end surface of the mating part and the upper end surface of the main adjustment gear. This can prevent the main adjustment gear from falling out, and at the same time reduce or eliminate the friction generated on the main adjustment gear when the main adjustment shaft is reversed, thereby protecting the one-way device.

[0027] The corresponding mechanism in the disc brake drives the main adjustment shaft to rotate in the reverse direction, and the main adjustment shaft drives the transmission part to rotate in the reverse direction. The transmission part drives the overload protection sleeve to rotate in the reverse direction under the action of friction. Due to the action of the one-way device, the main adjustment gear no longer rotates at this time, and other components in the clearance self-adjusting mechanism no longer move, thereby ensuring that the brake clearance will not be over-adjusted.

[0028] In the main adjustment assembly of the clearance self-adjusting mechanism of the above-mentioned disc brake, as another technical solution, the second elastic element is a butterfly spring.

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

[0030] 1. By adding an elastic element 2 to provide a force for the combination between the transmission part and the main adjustment assembly, the elastic element 2 will not be compressed or relaxed due to the action of other components when the main adjustment assembly is working. A constant friction force can be obtained between the transmission part and the main adjustment assembly, thereby ensuring a constant overload torque, thereby improving the working stability and ensuring the service life;

[0031] 2. The adjustment head is provided to adjust the elastic force of the elastic element 2, and the elastic force of the elastic element 2 remains constant during the working process, which not only makes the working stability higher, but also has higher practical value;

[0032] 3. The support seat supports the elastic element 1 and the elastic element 2 at the same time, which simplifies the structure of the entire main adjustment assembly and does not affect the normal movement of the pressure plate;

[0033] 4. The transmission part and the overload protection sleeve have a conical contact surface, which has better directionality and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a cross-sectional schematic diagram of a first embodiment of a main adjustment assembly of a clearance self-adjusting mechanism in a disc brake.

[0035] Figure 2 It is a cross-sectional schematic diagram of a second embodiment of the main adjustment assembly of the clearance self-adjusting mechanism in the disc brake.

[0036] In the figure, 1, main adjustment shaft; 1a, matching part; 2, elastic element 1; 3, main adjustment component; 3a, overload protection sleeve; 3a1, boss; 3b, main adjustment gear; 3c, one-way device; 4, transmission member; 4a, columnar positioning part; 4b, annular flange; 5, elastic element 2; 6, adjustment head; 7, support seat; 7a, support plate 1; 7b, support plate 2; 7c, plane bearing; 8, pressure plate; 9, anti-wear sleeve; 10, connecting plate; 11, thrust needle roller bearing. DETAILED DESCRIPTION

[0037] 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.

[0038] Embodiment 1

[0039] like Figure 1 As shown, the main adjustment assembly of the clearance self-adjusting mechanism in the disc brake includes a main adjustment shaft 1, a main adjustment component 3 sleeved on the main adjustment shaft 1 and capable of rotation, a pressure plate 8 arranged outside the main adjustment component 3, and an elastic element 1 2 acting on the pressure plate 8 and used to realize the reset of the brake mechanism in the disc brake. The upper end of the main adjustment shaft 1 has a matching portion 1a protruding in the radial direction. The main adjustment shaft 1 is also sleeved with a transmission member 4. The main adjustment shaft 1 and the transmission member 4 are circumferentially fixed. The transmission member 4 can drive the main adjustment component 3 to rotate or the two can slip. The main adjustment shaft 1 is provided with an elastic element 2 5, which is located in the elastic element 1 2 and the elastic force directions of the two are the same. The main adjustment shaft 1 is sleeved with a support seat 7, which is located on the same side of the elastic element 2 5 and the elastic element 1 2. The elastic element 2 5 acts between the support seat 7 and the transmission member 4 and the support seat 7 is limited in the direction away from the transmission member 4. The transmission member 4 and the main adjustment component 3 always have a tendency to be combined under the elastic force of the elastic element 2 5.

[0040] like Figure 1 As shown, the main adjustment component 3 includes an overload protection sleeve 3a, a main adjustment gear 3b and a non-return device 3c. The overload protection sleeve 3a is sleeved on the main adjustment shaft 1 and an anti-wear sleeve 9 is provided between the overload protection sleeve 3a and the main adjustment shaft 1. The main adjustment gear 3b is provided outside the overload protection sleeve 3a, the pressure plate 8 is sleeved outside the main adjustment gear 3b, and the non-return device 3c is provided between the main adjustment gear 3b and the overload protection sleeve 3a. A thrust needle roller bearing 11 is provided outside the upper end of the main adjustment shaft 1, and the thrust needle roller bearing 11 is limited between the lower end surface of the matching portion 1a and the upper end surface of the main adjustment gear 3b.

[0041] In this embodiment, the elastic force of the elastic element 2 5 acts on the transmission member 4, and the transmission member 4 is located below the overload protection sleeve 3a. The transmission member 4 can be specifically fixed to the main adjustment shaft 1 in the circumferential direction by spline matching. The upper end of the transmission member 4 and the lower end of the overload protection sleeve 3a are always in contact under the action of the elastic element 2 5. The lower end of the overload protection sleeve 3a extends out of the lower end of the main adjustment gear 3b, and an annular convex shoulder 3a1 is provided on the outer side of the lower end of the overload protection sleeve 3a. The transmission member 4 is annular, and the upper end surface of the transmission member 4 is provided with an annular flange 4b. The lower end of the convex shoulder 3a1 is located inside the upper end of the annular flange 4b. The outer side of the lower end of the convex shoulder 3a1 has a conical surface, and the inner side of the upper end of the annular flange 4b ​​has a conical surface. The conical surface of the convex shoulder 3a1 fits the conical surface of the annular flange 4b. The conical surface contact method has better directionality and stability than the plane contact. Of course, the friction transmission can also be realized by the plane contact method between the convex shoulder 3a1 and the annular flange 4b.

[0042] During braking, the corresponding mechanism in the disc brake drives the main adjustment shaft 1 to rotate through the matching part 1a, and the main adjustment shaft 1 drives the transmission member 4 to rotate synchronously. At the same time, the pressure plate 8 is subjected to force and overcomes the elastic force of the elastic element 1 2 and is compressed. Under the elastic force of the elastic element 2 5, the transmission member 4 contacts the overload protection sleeve 3a and has friction. Therefore, when the transmission member 4 rotates, the overload protection sleeve 3a is driven to rotate by the friction force, and the overload protection sleeve 3a drives the main adjustment gear 3b to rotate through the action of the one-way device 3c, thereby driving other components in the clearance self-adjusting mechanism to automatically adjust the brake clearance. Among them, the method and principle of how to automatically adjust the brake clearance can refer to a disc brake clearance automatic adjustment device disclosed in application number 201320442847.6.

[0043] During the adjustment of the brake clearance, the rotational resistance of other components in the clearance self-adjusting mechanism acting on the main adjustment gear 3b gradually increases. At this time, slippage will occur between the transmission member 4 and the overload protection sleeve 3a, so that the load is unloaded, thereby protecting the various force-bearing components in the main adjustment assembly from damage.

[0044] After the braking is finished, the input load applied to the pressure plate 8 disappears, and the pressure plate 8 gradually returns to the initial position under the action of the elastic element 2. The corresponding mechanism in the disc brake drives the main adjustment shaft 1 to rotate in the reverse direction, and the main adjustment shaft 1 drives the transmission member 4 to rotate in the reverse direction. The transmission member 4 drives the overload protection sleeve 3a to rotate in the reverse direction under the action of the friction force. Due to the action of the one-way device 3c, the main adjustment gear 3b no longer rotates at this time, and other components in the clearance self-adjusting mechanism no longer move, thereby ensuring that the brake clearance will not be over-adjusted.

[0045] like Figure 1As shown, the elastic element 2 5 can be compressed to form a reset elastic force, and an adjusting head 6 is threadedly connected to the main adjustment shaft 1. The adjusting head 6 can specifically be an adjusting nut. The support seat 7 is located between the elastic element 2 5 and the adjusting head 6 and the support seat 7 abuts against the adjusting head 6. The support seat 7 abuts against the adjusting head 6 so that the support seat 7 is limited in the direction away from the transmission member 4. By rotating the adjusting head 6, the elastic element 2 5 can be compressed or loosened, that is, the elastic force of the elastic element 2 5 can be adjusted. The adjustment of the elastic force here is the adjustment of the main adjustment assembly before work. During the adjustment of the brake clearance, the elastic force of the elastic element 2 5 acting on the transmission member 4 remains constant.

[0046] like Figure 1 As shown, the support seat 7 includes a plane bearing 7c and a support plate 1 7a and a support plate 2 7b which are sleeved on the main adjustment shaft 1 in sequence, the support plate 1 7a abuts on the adjustment head 6 and the support plate 2 7b abuts on the support plate 1 7a, the plane bearing 7c is connected to the outside of the support plate 2 7b, the support plate 2 7b is provided with a connecting plate 10, the plane bearing 7c is carried between the connecting plate 10 and the support plate 1 7a, and the outer diameters of the support plate 1 7a and the connecting plate 10 are substantially equal, the elastic element 1 2 is a coil spring, the upper and lower ends of the elastic element 1 2 abut on the pressure plate 8 and the connecting plate 10 respectively; the elastic element 2 5 is a coil spring, the upper and lower ends of the elastic element 2 5 abut on the transmission member 4 and the support plate 2 7b respectively. The lower end surface of the transmission member 4 is provided with a columnar positioning portion 4a at the center, and the upper end of the elastic element 2 5 should be outside the columnar positioning portion 4a and abut against the lower end surface of the transmission member 4.

[0047] The plane bearing 7c is supported between the connecting plate 10 and the support plate 1 7a, which means that the support seat 7 indirectly supports the elastic element 1, and at the same time, the support seat 7 directly supports the elastic element 2 5, so that the structure is simpler. Although this arrangement can adjust the elastic force of the elastic element 1 2 and the elastic element 2 5 at the same time when the adjusting head 6 rotates, the pressure plate 8 is pressed down by the input load, and the input load is much larger than the elastic force of the elastic element 2. Therefore, even if the elastic force of the elastic element 2 is increased when the elastic force of the elastic element 2 5 is adjusted, it will not cause any influence on the normal downward pressure of the pressure plate 8.

[0048] Embodiment 2

[0049] like Figure 2As shown, in this embodiment, the support seat 7 includes a plane bearing 7c and a support plate 1 7a and a support plate 2 7b which are sleeved on the main adjustment shaft 1 in sequence, the support plate 1 7a abuts on the adjustment head 6, the plane bearing 7c is arranged on the main adjustment shaft 1 and carried between the support plate 1 7a and the support plate 2 7b, the outer diameters of the support plate 1 7a and the support plate 2 7b are substantially the same, the elastic element 1 2 is a spiral spring, and the lower ends of the elastic element 1 2 and the elastic element 2 5 abut on the support plate 2 7b. The support plate 1 7b is used to support the elastic element 1 2 and the elastic element 2 5 at the same time, which plays a dual role and makes the structure simpler.

[0050] Embodiment 3

[0051] In this embodiment, the elastic element 2 5 is a butterfly spring.

[0052] 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 main adjustment assembly of a clearance self-adjusting mechanism in a disc brake, comprising a main adjustment shaft (1), an elastic element (2) for realizing the reset of the brake mechanism in the disc brake, and a main adjustment component (3) sleeved on the main adjustment shaft (1) and capable of rotation, wherein a transmission member (4) is fixed circumferentially on the main adjustment shaft (1), and transmission is realized between the transmission member (4) and the main adjustment component (3) by friction, characterized in that: The main adjustment shaft (1) is provided with an elastic element 2 (5), the elastic element 2 (5) is located inside the elastic element 1 (2) and the elastic forces of the two are in the same direction, a support seat (7) is sleeved on the main adjustment shaft (1), the support seat (7) is located on the same side of the elastic element 2 (5) and the elastic element 1 (2), the elastic element 2 (5) acts between the support seat (7) and the transmission member (4) and the support seat (7) is limited in a direction away from the transmission member (4), the transmission member (4) and the main adjustment assembly (3) always have a tendency to be combined under the elastic force of the elastic element 2 (5), and the elastic element The second elastic element (5) can be compressed, an adjusting head (6) is threadedly connected to the main adjusting shaft (1), a support seat (7) is located between the second elastic element (5) and the adjusting head (6), and the support seat (7) is against the adjusting head (6), the main adjusting component (3) comprises an overload protection sleeve (3a), a main adjusting gear (3b) and a one-way device (3c) located between the overload protection sleeve (3a) and the main adjusting gear (3b), the transmission member (4) is located below the overload protection sleeve (3a), and the upper end of the transmission member (4) and the lower end of the overload protection sleeve (3a) are always in contact with each other under the action of the second elastic element (5).

2. The main adjustment assembly of the clearance self-adjusting mechanism in the disc brake according to claim 1, characterized in that: The main adjustment component (3) is provided with a pressure plate (8) outside, one end of the elastic element (2) acts on the pressure plate (8), and the other end of the elastic element (2) directly or indirectly acts on the support seat (7).

3. The main adjustment assembly of the clearance self-adjusting mechanism in the disc brake according to claim 2, characterized in that: The second elastic element (5) is a coil spring. A columnar positioning portion (4a) is provided at the center of the lower end surface of the transmission member (4). The upper end of the second elastic element (5) is sleeved outside the columnar positioning portion (4a) and abuts against the lower end surface of the transmission member (4).

4. The main adjustment assembly of the self-adjusting mechanism for the clearance in the disc brake according to claim 3, characterized in that: The support seat (7) comprises a plane bearing (7c) and a support plate 1 (7a) and a support plate 2 (7b) which are sequentially sleeved on the main adjustment shaft (1); the support plate 1 (7a) abuts against the adjustment head (6) and the support plate 2 (7b) abuts against the support plate 1 (7a); the plane bearing (7c) is connected to the outside of the support plate 2 (7b); a connecting plate (10) is provided on the outer sleeve of the support plate 2 (7b); the plane bearing (7c) is supported between the connecting plate (10) and the support plate 1 (7a); the elastic element 1 (2) is a coil spring and its lower end abuts against the connecting plate (10); and the lower end of the elastic element 2 (5) abuts against the support plate 2 (7b).

5. The main adjustment assembly of the self-adjusting mechanism for the clearance in the disc brake according to claim 3, characterized in that: The support seat (7) comprises a plane bearing (7c) and a support plate 1 (7a) and a support plate 2 (7b) which are sleeved on the main adjustment shaft (1) in sequence, the support plate 1 (7a) abuts against the adjustment head (6), the plane bearing (7c) is arranged on the main adjustment shaft (1) and supported between the support plate 1 (7a) and the support plate 2 (7b), the elastic element 1 (2) is a coil spring, and the lower ends of the elastic element 1 (2) and the elastic element 2 (5) both abut against the support plate 2 (7b).

6. The main adjustment assembly of the self-adjusting mechanism for the clearance in the disc brake according to claim 1, characterized in that: An annular boss (3a1) is provided on the outer side of the lower end of the overload protection sleeve (3a); the transmission member (4) is annular; the upper end surface of the transmission member (4) has an annular flange (4b); the lower end of the boss (3a1) is located inside the upper end of the annular flange (4b); and the contact between the two is conical contact or plane contact.

7. The main adjustment assembly of the self-adjusting mechanism of the disc brake according to claim 1, characterized in that: The upper end of the main adjustment shaft (1) has a matching portion (1a) protruding in the radial direction, and a thrust needle roller bearing (11) is arranged outside the upper end of the main adjustment shaft (1), and the thrust needle roller bearing (11) is limited between the lower end surface of the matching portion (1a) and the upper end surface of the main adjustment gear (3b).

8. The main adjustment assembly of the self-adjusting mechanism for the clearance in the disc brake according to claim 1, characterized in that: The elastic element 2 (5) is a butterfly spring.

Images