Parking braking assembly in disc brake

Abstract

The invention discloses a parking braking assembly in a disc brake, and relates to the field of parking braking systems.The parking braking assembly in the disc brake comprises a brake disc, a fixed clamp and a brake pad, the fixed clamp pushes the brake pad to abut against the side face of the brake disc for service braking, and a limiting piece is hinged to the side face of the fixed clamp; a parking braking system is designed by utilizing part of the structure of the disc type service braking system, so that the space of a vehicle is saved, the installation of parts is simplified, a hinge rod is hinged to the side face of a fixed caliper of an existing integrated structure, and a brake pad abuts against the side face of a brake disc through the hinge rod for service braking. And then the limiting piece associated with the brake rod is arranged to limit the installation state between the fixed clamp and the hinge rod, when the brake rod is pulled up, the hinge rod on the side face of the fixed clamp loses the pushing effect on the brake pad, then the hinge rod deflects to enable the brake pin to move to the front face to be matched with the brake groove for parking braking, a vehicle parking system is optimized, and the overall using effect is good.

Description

Technical Field

[0001] The invention relates to a parking brake assembly, in particular to a parking brake assembly in a disc brake. Background Art

[0002] Compared with driving brake, the braking force required for parking brake is much smaller, and usually does not need to be driven by hydraulic system. In addition, parking brake focuses more on ensuring long-term continuous and effective effect to ensure that there is no problem of slipping. In addition, because disc hydraulic brake has fast response speed and stable braking effect, it is usually used in vehicle driving brake.

[0003] The existing technology divides the service brake and the parking brake into two systems. First, it can ensure the independent action of the two systems to avoid the inability to apply effective measures when the service brake fails. Second, the braking performance of the brake disc edge is weak, the braking effect is poor, and the problem of slipping is prone to occur. In addition, the wheel-side brake needs to distribute the handbrake lock actuating force, and an additional mechanical structure needs to be added, which affects the consistency of the braking performance and also affects the layout space of the entire vehicle.

[0004] To this end, those skilled in the art have proposed a parking brake assembly in a disc brake, which is improved on the basis of a disc service brake, and a parking brake system is installed using a partial structure of the disc brake to ensure good parking brake use while minimizing the transmission structure. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a parking brake assembly in a disc brake, wherein a parking brake system is set up using some components of the disc brake, the brake pad is set as a hinged structure on the side of the fixed caliper, a brake pin is set behind the brake pad to cooperate with the brake disc for parking braking, and when the parking brake system is not in use, the fixed caliper and the brake pad are positioned by a limit plate to ensure stable use of the service brake system. When the parking brake system is in use, the brake rod pulls the limit plate out of the limit position through a traction steel cable, and at the same time pushes the brake pin into the brake disc for braking.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a parking brake assembly in a disc brake, including a brake disc, a fixed caliper and a brake pad, the brake disc is coaxially fixed with the wheel, a fixed caliper is hingedly arranged on one side of the brake disc, a brake pad is arranged on the side of the fixed caliper close to the brake disc, a hydraulic rod pushes the fixed caliper into position, the fixed caliper pushes the brake pad against the brake disc, and the friction resistance between the two is used to brake the brake disc.

[0007] A brake pin is provided on the side of the fixed caliper away from the brake disc, and a brake groove is provided in a ring shape on the side of the brake disc corresponding to the brake pin. When parking braking is required, the brake pin is pushed into the brake groove provided on the side of the brake disc, and the parking brake of the vehicle is realized by static braking.

[0008] The side of the fixed caliper is slidably engaged with a limiting plate, and the fixed caliper and the brake pad are limited by the limiting plate. When the parking brake is not used, the hydraulic rod pushes the fixed caliper into position, that is, the brake pad is directly pressed against the side of the brake disc for braking.

[0009] A driving rod is arranged on one side of the brake disc corresponding to the limiting plate, a traction steel cable is fixedly connected to the side of the limiting plate, and one end of the traction steel cable away from the limiting plate is connected to the brake rod.

[0010] The traction cable is pulled by the brake rod, and the limit plate is lifted. At the same time, the lifting action of the limit plate pushes the fixed caliper toward the brake disc through the driving rod. The brake pad hinged on the side of the fixed caliper is deflected, and the brake pin fixed at the rear enters the brake groove on the side of the brake disc to achieve limiting.

[0011] Preferably, a hinge rod is hingedly provided on one side of the fixed caliper close to the brake disc, and the brake pad is fixedly provided on the side of the hinge rod. When the hydraulic rod drives the fixed caliper to move forward, it drives the hinge rod and the brake pad to move forward, pressing the brake pad against the side of the brake disc to perform driving braking.

[0012] A through slot is provided on the side of the hinge rod corresponding to the brake pin. After the hinge rod loses the limit of the limit plate, it deflects as the fixed clamp advances. The brake pin arranged on the side of the fixed clamp advances to the front of the hinge rod through the through slot, and then can enter the brake slot provided on the side of the brake disc for limited braking.

[0013] Preferably, the side surfaces of the fixed clamp and the hinge rod correspond to the limiting pieces fixedly connected to the limiting blocks, and the limiting blocks are used to limit the advancing distance of the limiting pieces, thereby ensuring that the limiting pieces position the connection state of the fixed clamp and the hinge rod.

[0014] A first spring is tightly arranged between the limit plate and the fixed clamp. The first spring arranged between the limit plate and the fixed clamp can automatically reset after the pulling force of the traction cable is removed, thereby ensuring normal use of the fixed clamp for motor vehicle braking.

[0015] Preferably, a hinge seat is fixed on the side of the fixed caliper corresponding to the brake disc, and the brake pin is hingedly arranged on the side of the fixed caliper through the hinge seat. The brake pin hinged through the hinge seat can press against the inner side of the brake groove according to the rotation angle of the hinge seat.

[0016] A second spring is tightly arranged between the brake pin and the fixed caliper. The elastic force of the second spring on the brake pin ensures the braking effect of the brake pin cooperating with the brake groove. At the same time, when the force exceeds a certain limit, the second spring can be compressed to protect the structure from damage and continue to exert the braking effect.

[0017] Preferably, a wedge is fixed on the side of the brake pin corresponding to the brake groove, and the wedge can limit the edge of the brake groove during parking brake to prevent the brake pin from slipping out of the brake groove. A slide rail is fixedly connected to the side of the fixed caliper corresponding to the brake pin. The slide rail arranged on the outside of the brake pin can not only be used as a guide structure for the brake pin, but also can strengthen the strength of the brake pin, thereby further ensuring the stable use of the parking brake system.

[0018] Preferably, a telescopic rod is fixed on the side of the hinge rod away from the brake pad, and a third spring is arranged on the inner side of the telescopic rod. The telescopic rod pressed against the third spring can exert a certain thrust on the hinge rod, so that the brake pad is pressed against the side of the brake disc to increase the friction resistance of the parking brake system.

[0019] Preferably, a tightening screw is penetrated and rotatably provided at one end of the telescopic rod away from the hinge rod, a slider is slidably clamped on the inner side of the telescopic rod, the tightening screw penetrates the slider and is threadedly connected thereto, and one end of the third spring is fixedly connected to the slider.

[0020] The relative installation position of the slider inside the telescopic rod is adjusted by the tightening bolt, thereby adjusting the elastic force of the third spring on the extending end of the telescopic rod. The elastic force of the telescopic rod determines the friction resistance between the brake pad and the brake disc.

[0021] Preferably, the driving rod includes a fixed rod, which is fixed above the fixed rod parallel to the advancement direction of the fixed clamp, and a first push rod is slidably arranged on the side of the fixed rod corresponding to the limiting plate, the first push rod is hingedly arranged with a connecting rod, and the connecting rod is hingedly connected to a second push rod at one end away from the first push rod, the middle section of the second push rod is hingedly connected to the fixed rod, and the extended end of the second push rod is arranged against the fixed clamp.

[0022] Preferably, a fixing block is fixedly connected to the side of the fixing rod, and a positioning groove is provided on the side of the first push rod corresponding to the fixing block, and the first push rod is slidably engaged with the fixing block on the side of the fixing rod.

[0023] The present invention discloses a parking brake assembly in a disc brake, which has the following beneficial effects: 1. The parking brake assembly in the disc brake utilizes part of the structure of the disc service brake system to design the parking brake system, thereby saving vehicle space and simplifying the installation of parts. A hinge rod is hingedly arranged on the side of the fixed clamp of the existing integrated structure, and the brake pad is pressed against the side of the brake disc by the hinge rod for service braking. Then, a limit plate associated with the brake rod is arranged to limit the installation state between the fixed clamp and the hinge rod. When the brake rod is pulled up, the hinge rod on the side of the fixed clamp loses its pushing effect on the brake pad, and then the hinge rod deflects to move the brake pin to the front to cooperate with the brake groove for parking braking, thereby optimizing the vehicle parking system and achieving better overall use effect.

[0024] 2. The parking brake assembly in the disc brake is hinged between the brake pin and the fixed caliper by a second spring, and a hinge seat is provided on the outside of the brake pin to enhance the braking strength of the brake pin. After the brake pin enters the brake groove, the elastic force of the second spring presses against the brake groove to achieve vehicle braking. At the same time, the second spring provides a rotation buffer for the brake pin to avoid damage to the parking brake system. In addition, a wedge block is provided on the side of the end of the brake pin to prevent the brake pin from slipping out of the limit state of the brake groove.

[0025] 3. The parking brake assembly in the disc brake has a telescopic rod set on the side of the hinge rod to tighten it through the third spring. When the parking brake function is used, as the fixed caliper deflects, the telescopic rod is pressed against the hinge rod, thereby pushing the brake pad to press against the brake disc for braking, and the resistance of the brake pin is shared by the brake pad.

[0026] 4. In the parking brake assembly of the disc brake, when the limit plate is lifted, the first push rod is directly pushed by the limit plate to move forward, and the moving first push rod drives the connecting rod to move forward through a hinged relationship. The moving forward of the connecting rod drives the second push rod to deflect, and then the deflection of the second push rod squeezes the push caliper to move forward, thereby achieving the brake pin's tight braking of the brake disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the installation structure of the brake disc and the fixed caliper of the present invention; Figure 3 It is a schematic diagram of the installation structure of the inner side limit piece of the fixed clamp of the present invention; Figure 4This is a schematic diagram of the installation and control structure of the limiter of the present invention; Figure 5 This is a schematic diagram of the brake pin installation structure of the present invention; Figure 6 This is a schematic diagram of the telescopic rod tightening structure of the present invention; Figure 7 This is a schematic diagram of the drive rod installation structure of the present invention.

[0029] In the figure: 1. brake disc; 2. fixed caliper; 3. brake pad; 4. brake pin; 5. brake groove; 6. limit plate; 7. drive rod; 701. fixed rod; 702. first push rod; 703. connecting rod; 704. second push rod; 8. traction cable; 9. hinge rod; 10. through slot; 11. limit block; 12. first spring; 13. hinge seat; 14. second spring; 15. wedge block; 16. slide rail; 17. telescopic rod; 18. third spring; 19. tightening screw; 20. slider; 21. fixed block; 22. carry groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The embodiment of the present invention discloses a parking brake assembly in a disc brake; According to the attached Figure 1 and attached Figure 2 As shown, it includes a brake disc 1, a fixed caliper 2 and a brake pad 3. The brake disc 1 is coaxially fixed with the wheel, the fixed caliper 2 is hingedly arranged on one side of the brake disc 1, and the brake pad 3 is arranged on the side of the fixed caliper 2 close to the brake disc 1.

[0032] In the prior art, the fixed caliper 2 is pushed by a hydraulic device, and the fixed caliper 2 squeezes the brake pad 3 and presses it against the side of the brake disc 1 to achieve braking. This braking method has a fast response speed and a stable braking effect. It is usually used in the vehicle's service braking. In addition, an independent parking brake system is set at other transmission path positions of the vehicle to help with the vehicle's parking brake. However, there is a problem of duplication in the independent settings of the two systems, which affects the layout space of the entire vehicle and increases the cost of vehicle parts and maintenance costs. For this reason, technical personnel in this field install the parking brake system in combination with some components of the service brake system to reduce the cost of vehicle parts.

[0033] According to the attached Figure 2 and attached Figure 3As shown, a brake pin 4 is provided on the side of the fixed caliper 2 away from the brake disc 1, and a brake groove 5 is provided in a ring shape on the side of the brake disc 1 corresponding to the brake pin 4. The brake pin 4 is pushed into the brake groove 5 by the fixed caliper 2, so that the parking brake of the vehicle is realized by using the brake disc 1.

[0034] The side of the fixed caliper 2 is slidably engaged with a limit plate 6, a driving rod 7 is provided on one side of the brake disc 1 corresponding to the limit plate 6, a traction cable 8 is fixedly connected to the side of the limit plate 6, and the end of the traction cable 8 away from the limit plate 6 is connected to the brake rod.

[0035] The traction cable 8 is pulled by the brake rod, and the limit plate 6 is lifted. At the same time, the lifting action of the limit plate 6 pushes the fixed clamp 2 to move toward the brake disc 1 through the driving rod 7. The brake pad 3 hinged on the side of the fixed clamp 2 is deflected, and the brake pin 4 fixed behind it enters the brake groove 5 on the side of the brake disc 1 to achieve limiting.

[0036] A hinge rod 9 is hingedly provided on one side of the fixed caliper 2 close to the brake disc 1, and the brake pad 3 is fixedly arranged on the side of the hinge rod 9. When the hinge rod 9 hinged on the side of the fixed caliper 2 is limited by the limit plate 6, the deflection of the fixed caliper 2 directly applies a squeezing and pushing effect on the brake pad 3 through the hinge rod 9, so that the brake pad 3 is pressed against the side of the brake disc 1 to provide friction braking. When the parking brake is used, the hinge rod 9 deflects after contacting the brake pad 3, and then the brake pin 4 arranged behind the hinge rod 9 protrudes and enters the brake groove 5 to achieve braking.

[0037] According to the attached Figure 4 As shown, a through slot 10 is provided on the side of the hinge rod 9 corresponding to the brake pin 4. When the fixed clamp 2 pushes the hinge rod 9 to contact the brake pad 3, the hinge rod 9 is deflected according to the hinge end, and then the brake pin 4 arranged behind the hinge rod 9 passes through the through slot 10 and protrudes in front of the hinge rod 9, making it convenient to enter the brake groove 5 before the brake pad 3 to realize braking.

[0038] The side surfaces of the fixed clamp 2 and the hinge rod 9 correspond to the limiting pieces 6 which are fixedly connected to the limiting blocks 11 , and the limiting blocks 11 help to limit the hinged position of the limiting pieces 6 between the fixed clamp 2 and the hinge rod 9 .

[0039] A first spring 12 is tightly arranged between the limit plate 6 and the fixed clamp 2. Under the elastic force of the first spring 12, the limit plate 6 is pressed against the inner side of the limit block 11 to limit the pushing and squeezing action of the fixed clamp 2 and the hinge rod 9. In addition, after the first spring 12 removes the traction effect of the traction cable 8 on the limit plate 6, it helps the limit plate 6 to reset to avoid affecting the normal use of the service brake system.

[0040] According to the attached Figure 5As shown, a hinge seat 13 is fixed on the side of the fixed caliper 2 corresponding to the brake disc 1, and the brake pin 4 is hingedly arranged on the side of the fixed caliper 2 through the hinge seat 13. The brake pin 4 hingedly installed through the hinge seat 13 can press against the brake disc 1, and when the pressure exceeds the resistance, the brake pin 4 is deflected to protect the components and consume kinetic energy.

[0041] A second spring 14 is tightly arranged between the brake pin 4 and the fixed caliper 2. The second spring 14 applies elastic force to the brake pin 4 so that the brake pin 4 is tightly pressed in the brake groove 5 to ensure the braking effect.

[0042] A wedge block 15 is fixed on the side of the brake pin 4 corresponding to the brake groove 5. The wedge block 15 can effectively prevent the brake pin 4 from escaping from the limiting range of the brake groove 5, thereby ensuring the stability of the brake system.

[0043] A slide rail 16 is fixedly connected to the side of the fixed caliper 2 corresponding to the brake pin 4. The slide rail 16 can not only serve as a guide structure for the brake pin 4, but also enhance the structural strength of the brake pin 4 to avoid the problem of poor strength of the hinged brake pin 4.

[0044] According to the attached Figure 6 As shown, a telescopic rod 17 is fixed to the side of the hinge rod 9 away from the brake pad 3, and a third spring 18 is tightly arranged on the inner side of the telescopic rod 17. The telescopic rod 17 pressed against the third spring 18 can provide a squeezing force of the fixed clamp 2 on the hinge rod 9, supplement the braking effect of the brake pin 4 through the brake pad 3, consume the kinetic energy of the vehicle, and better brake the vehicle.

[0045] A tightening screw 19 is rotatably provided through one end of the telescopic rod 17 away from the hinge rod 9, a slider 20 is slidably engaged on the inner side of the telescopic rod 17, the tightening screw 19 penetrates the slider 20 and is threadedly connected thereto, and one end of the third spring 18 is fixedly connected to the slider 20.

[0046] The tightening screw 19 can be rotated to drive the slider 20 to slide and position in the telescopic rod 17 through a threaded connection relationship, so that the slider 20 applies forces of different strengths to the third spring 18 .

[0047] According to the attached Figure 7 As shown, the driving rod 7 includes a fixed rod 701, which is fixed above the fixed clamp 2 in parallel with the advancement direction thereof. A first push rod 702 is slidably arranged on the side of the fixed rod 701 corresponding to the limiting plate 6. When the limiting plate 6 is lifted, a thrust is applied to the first push rod 702, and the first push rod 702 slides upward relative to the fixed rod 701.

[0048] The first push rod 702 is hingedly provided with a connecting rod 703, and the connecting rod 703 is hingedly connected to the second push rod 704 at one end away from the first push rod 702. The middle section of the second push rod 704 is hingedly connected to the fixed rod 701, and the extended end of the second push rod 704 is set against the fixed clamp 2.

[0049] The advancement of the first push rod 702 drives the connecting rod 703 to advance together through the hinge relationship, and during the advancement process, it drives the second push rod 704 to advance through the hinge relationship. At the same time, the middle section of the second push rod 704 is hinged and fixed. Therefore, the second push rod 704 will also undergo an angular deflection during the advancement process. The deflected second push rod 704 exerts a squeezing and pushing effect on the fixed clamp 2, thereby pushing the fixed clamp 2 into the parking brake position, completing the entire parking brake control process.

[0050] A fixing block 21 is fixedly connected to the side of the fixing rod 701 , and a carry slot 22 is provided on the side of the first push rod 702 corresponding to the fixing block 21 . The first push rod 702 is slidably engaged with the fixing block 21 on the side of the fixing rod 701 .

[0051] The parking brake assembly in the disc brake utilizes part of the structure of the disc service brake system to design the parking brake system, thereby saving vehicle space and simplifying the installation of parts and components. A hinge rod 9 is hingedly provided on the side of the fixed clamp 2 of the existing integrated structure, and the brake pad 3 is pressed against the side of the brake disc 1 by the hinge rod 9 to perform service braking. Then, a limit plate 6 associated with the brake lever is provided to limit the installation state between the fixed clamp 2 and the hinge rod 9. When the brake lever is pulled up, the hinge rod 9 on the side of the fixed clamp 2 loses its pushing effect on the brake pad 3, and then the hinge rod 9 deflects to move the brake pin 4 to the front to cooperate with the brake groove 5 to perform parking braking, thereby optimizing the vehicle parking system and achieving better overall use effect.

[0052] Furthermore, the brake pin 4 and the fixed clamp 2 are hinged by a second spring 14, and a hinge seat 13 is provided on the outside of the brake pin 4 to enhance the braking strength of the brake pin 4. After the brake pin 4 enters the brake groove 5, the elastic force of the second spring 14 presses against the brake groove 5 to achieve vehicle braking. At the same time, the second spring 14 provides a rotation buffer for the brake pin 4 to avoid damage to the parking brake system. In addition, a wedge block 15 is provided on the side of the end of the brake pin 4 to prevent the brake pin 4 from slipping out of the limited state of the brake groove 5.

[0053] Furthermore, a telescopic rod 17 is set on the side of the hinge rod 9 through a third spring 18 to press it. When the parking brake function is used, as the fixed clamp 2 deflects, the telescopic rod 17 presses the hinge rod 9, thereby pushing the brake pad 3 to press against the brake disc 1 for braking, and the resistance of the brake pin 4 is shared by the brake pad 3.

[0054] Furthermore, in the process of the limit plate 6 being lifted, the first push rod 702 is directly pushed by the limit plate 6 to move forward, and the moving first push rod 702 drives the connecting rod 703 to move forward through the hinge relationship. The movement of the connecting rod 703 drives the second push rod 704 to deflect, and then the deflection of the second push rod 704 squeezes the advancement of the caliper 2, thereby realizing the tight braking of the brake pin 4 on the brake disc 1.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A parking brake assembly in a disc brake, comprising a brake disc (1), a fixed caliper (2) and a brake pad (3), wherein the brake disc (1) is coaxially fixed to a wheel, the fixed caliper (2) is hingedly arranged on one side of the brake disc (1), and the brake pad (3) is arranged on a side of the fixed caliper (2) close to the brake disc (1). Features: A brake pin (4) is provided on a side of the fixed caliper (2) away from the brake disc (1); a brake groove (5) is provided in an annular manner on a side of the brake disc (1) corresponding to the brake pin (4); a limit plate (6) is slidably engaged with the side of the fixed caliper (2); a driving rod (7) is provided on a side of the brake disc (1) corresponding to the limit plate (6); a traction steel cable (8) is fixedly connected to the side of the limit plate (6); and an end of the traction steel cable (8) away from the limit plate (6) is connected to the brake rod; The traction cable (8) is pulled by the brake rod, and the limit plate (6) is lifted. At the same time, the lifting action of the limit plate (6) pushes the fixed clamp (2) toward the brake disc (1) through the driving rod (7). The brake pad (3) hinged on the side of the fixed clamp (2) is deflected, and the brake pin (4) fixed behind it enters the brake groove (5) on the side of the brake disc (1) to achieve limiting.

2. The parking brake assembly in a disc brake as claimed in claim 1, Features: A hinge rod (9) is hingedly provided on one side of the fixed caliper (2) close to the brake disc (1), the brake pad (3) is fixedly provided on the side of the hinge rod (9), and a through slot (10) is provided on the side of the hinge rod (9) corresponding to the brake pin (4).

3. The parking brake assembly in a disc brake as claimed in claim 1, Features: The side surfaces of the fixed clamp (2) and the hinge rod (9) correspond to the limiting pieces (6) which are fixedly connected to the limiting blocks (11), and a first spring (12) is tightly arranged between the limiting pieces (6) and the fixed clamp (2).

4. The parking brake assembly in a disc brake as claimed in claim 1, Features: A hinge seat (13) is fixed to the side of the fixed caliper (2) corresponding to the brake disc (1), the brake pin (4) is hingedly arranged on the side of the fixed caliper (2) through the hinge seat (13), and a second spring (14) is tightly arranged between the brake pin (4) and the fixed caliper (2).

5. The parking brake assembly in a disc brake as claimed in claim 1, Features: A wedge block (15) is fixed on the side of the brake pin (4) corresponding to the brake groove (5), and a slide rail (16) is fixedly connected to the side of the fixed clamp (2) corresponding to the brake pin (4).

6. The parking brake assembly in a disc brake as claimed in claim 2, Features: A telescopic rod (17) is fixed to a side of the hinge rod (9) away from the brake pad (3), and a third spring (18) is tightly arranged on the inner side of the telescopic rod (17).

7. The parking brake assembly in a disc brake as claimed in claim 6, Features: An adjusting screw (19) is rotatably provided through one end of the telescopic rod (17) away from the hinge rod (9), a slider (20) is slidably engaged on the inner side of the telescopic rod (17), the adjusting screw (19) passes through the slider (20) and is threadedly connected thereto, and one end of the third spring (18) is fixedly connected to the slider (20).

8. The parking brake assembly in a disc brake as claimed in claim 1, Features: The driving rod (7) comprises a fixing rod (701), the fixing rod (701) being fixedly arranged above the fixing clamp (2) in parallel with the advancing direction thereof, a first push rod (702) being slidably arranged on the side surface of the fixing rod (701) corresponding to the limiting plate (6), the first push rod (702) being hingedly arranged with a connecting rod (703), the connecting rod (703) being hingedly connected to a second push rod (704) at one end away from the first push rod (702), the middle section of the second push rod (704) being hingedly connected to the fixing rod (701), and the extending end of the second push rod (704) being arranged to press against the fixing clamp (2).

9. The parking brake assembly in a disc brake as claimed in claim 8, Features: A fixing block (21) is fixedly connected to the side of the fixing rod (701), and a positioning groove (22) is provided on the side of the first push rod (702) corresponding to the fixing block (21). The first push rod (702) is slidably engaged with the fixing block (21) on the side of the fixing rod (701).

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