CN109424667B

CN109424667B - Disc brake and vehicle

Info

Publication number: CN109424667B
Application number: CN201710758844.6A
Authority: CN
Inventors: 郑祖雄
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2017-08-29
Filing date: 2017-08-29
Publication date: 2020-11-06
Anticipated expiration: 2037-08-29
Also published as: CN109424667A; WO2019042318A1

Abstract

The present disclosure relates to a disc brake and a vehicle. The disc brake comprises a brake caliper body, a first brake block, a service brake unit and a parking brake unit, wherein the parking brake unit comprises a parking motor and a parking screw rod mechanism, and the parking motor drives the first brake block to move so as to compress a brake disc through the parking screw rod mechanism. In the brake disclosed by the invention, the service brake unit and the parking brake unit are arranged, so that the brake can simultaneously realize two functions of service brake and parking brake, the function integration level is high, and the occupied space is small. In addition, through parking motor and parking screw mechanism for can realize electronic parking function, compare in hydraulic pressure or pneumatic parking, the braking response is faster, and the security is better.

Description

Disc brake and vehicle

Technical Field

The present disclosure relates to the field of brakes, and in particular, to a disc brake and a vehicle.

Background

In a traditional hydraulic or pneumatic braking system, the obvious defects of complex gas-liquid pipelines, difficult maintenance, complex arrangement structure, slow braking dynamic response, lower braking comfort performance and the like exist. For example, in a hydraulic brake system, a rebound vibration phenomenon occurs in a brake pedal when an anti-lock brake system is operated, which affects brake comfort. For another example, because the brake pedal mechanism is directly connected with the brake transmission device and the brake actuating device, the impact force generated when the vehicle collides can be directly transmitted into the cab through the brake system, and the safety performance of the automobile is seriously affected. For another example, the conventional hydraulic brake system employs large-sized components of the conventional hydraulic brake system, such as a vacuum brake booster, a brake master cylinder, and an oil reservoir, which not only have the problems of complicated structure and assembly, large size, and difficulty in maintenance, but also have the problems of the need to periodically replace hydraulic oil and periodically check whether there is hydraulic oil leakage due to the arrangement of a hydraulic brake pipeline and brake fluid for connecting corresponding components in the system. In view of the above problems, in recent years, various electromechanical brake systems having a simple structure, a fast braking dynamic response, and excellent braking comfort and safety performance as compared to hydraulic or pneumatic brake systems have been developed.

Disclosure of Invention

The purpose of this disclosure is to provide a disc brake that can simultaneously achieve both service braking and parking braking functions.

In order to achieve the above object, the present disclosure provides a disc brake, including a caliper body, a first brake pad, a service brake unit, and a parking brake unit, where the parking brake unit includes a parking motor and a parking screw mechanism, and the parking motor drives the first brake pad to move through the parking screw mechanism so as to press a brake disc.

Optionally, the disc brake is a floating caliper disc brake, the disc brake further comprising a second brake pad, the first and second brake pads being located on both sides of the brake disc, respectively, the second brake pad being mounted on the caliper body.

Optionally, the parking brake unit further includes a push rod for pushing the first brake pad to move, and the parking motor drives the push rod to move through the parking screw mechanism.

Optionally, the disc brake further comprises a link mechanism, and the output force of the parking screw rod mechanism is increased by the link mechanism and then transmitted to the push rod.

Optionally, the parking screw mechanism includes parking lead screw and suit and is in parking nut on the parking lead screw, link mechanism includes first connecting rod, second connecting rod, third connecting rod and first base, first connecting rod is followed the axial extension of parking lead screw, the first end of first connecting rod with parking nut links to each other, the second end of first connecting rod with the first end of second connecting rod is articulated, the second end of second connecting rod with the first end of third connecting rod is articulated, the second end of third connecting rod with first base is articulated, first base is fixed in the body of the brake caliper, the one end of push rod connect in the middle part of third connecting rod, the other end is used for promoting first brake block, first connecting rod with the push rod is perpendicular.

Optionally, the link mechanism further includes a fourth link, a fifth link, a second base, and a support rod, the second end of the first link, the first end of the second link, and the first end of the fourth link are hinged together, the second end of the fourth link is hinged to the first end of the fifth link, the second end of the fifth link is hinged to the second base, the second base is fixed to the caliper body, one end of the support rod is connected to the middle of the fifth link, the other end of the support rod is supported on the caliper body, the fourth link and the second link are symmetrically arranged with respect to the first link, and the fifth link and the third link are symmetrically arranged with respect to the first link.

Optionally, the service brake unit includes driving motor, driving reduction gears and driving screw rod mechanism, the driving motor is external rotor electric machine, the stator of driving motor has along axially extended cavity, driving screw rod mechanism includes driving lead screw and suit and is in driving nut on the driving lead screw, the driving lead screw runs through the cavity, the rotor of driving motor passes through driving reduction gears drive the driving lead screw is rotatory, so that the driving nut is followed driving lead screw axial displacement, thereby promotes first brake block removes in order to compress tightly the brake disc.

Optionally, the travelling screw mechanism is a rolling screw mechanism.

Optionally, the driving screw rod is formed as a hollow rod, and the push rod is arranged through the driving screw rod.

Optionally, the disc brake further comprises a piston, the piston is in sliding fit with one end of the cavity, and the service nut and the push rod push the first brake block to move through the piston.

Optionally, a sealing ring is arranged between the piston and the inner wall of the cavity.

Optionally, the parking brake unit further comprises an electromagnetic clutch, the electromagnetic clutch being engaged to lock the motor shaft when the electromagnetic clutch is de-energized; when the electromagnetic clutch is energized, the electromagnetic clutch is disengaged to release the motor shaft.

Optionally, the electromagnetic clutch includes electro-magnet, translation friction disc and rotatory friction disc, the electro-magnet includes the fixed core, moves the iron core and acts on move the actuating spring of iron core, rotatory friction disc with the motor shaft is connected, the translation friction disc can by move the iron core drive.

Optionally, the electromagnetic clutch further includes a clutch housing, an outer race, and an inner race, the inner race being splined to the motor shaft, the rotating friction plate being disposed on the inner race, the clutch housing being fixed relative to the caliper body, the outer race being splined to an inner wall of the clutch housing, the translating friction plate being disposed on the outer race.

Optionally, the parking screw mechanism comprises a parking screw and a parking nut sleeved on the parking screw, and the thread lead angle of the parking screw is smaller than the self-locking angle.

Optionally, the parking brake unit further comprises a parking deceleration mechanism, and the parking motor is in transmission connection with the parking screw rod mechanism through the parking deceleration mechanism.

In the brake disclosed by the invention, the service brake unit and the parking brake unit are arranged, so that the brake can simultaneously realize two functions of service brake and parking brake, the function integration level is high, the structure is compact, and the occupied space is small. In addition, through parking motor and parking screw mechanism for can realize electronic parking function, compare in hydraulic pressure or pneumatic parking, the braking response is faster, and the security is better.

The present disclosure also provides a vehicle comprising a disc brake as described above.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a sectional view of a disc brake according to an embodiment of the present disclosure;

fig. 2 to 4 are partially enlarged views of fig. 1, respectively;

fig. 5 and 6 are sectional views of a disc brake according to another embodiment of the present disclosure, in which a complete caliper body is shown in fig. 5 and a portion of the caliper body is omitted in fig. 6.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional terms such as "left" and "right" generally refers to the left and right in the drawing plane direction of the corresponding drawings, and these directional terms are used for convenience of description only and should not be construed as limiting the present disclosure.

According to an aspect of the present disclosure, there is provided a disc brake, as shown in fig. 1 and 5, including a caliper body 10, a first pad 31, a service brake unit, and a parking brake unit, the first pad 31 and the second pad 32 being located at both sides of a disc 20, respectively. The service brake unit comprises a service motor 40 and a service screw mechanism 60, wherein the service motor 40 drives the first brake block 31 to move through the service screw mechanism 60 so as to press the brake disc 20. The parking brake unit includes a parking motor 110 and a parking screw mechanism 130, and the parking motor 110 drives the first pad 31 to move through the parking screw mechanism 130 to press the brake disc 20.

The disc brake of the present disclosure may be a fixed caliper disc brake or a floating caliper disc brake.

In case the disc brake of the present disclosure is a floating caliper disc brake, the brake further comprises a second brake pad 32, which second brake pad 32 is mounted on the caliper body 10, the caliper body 10 being axially movable with respect to the brake disc 20. Specifically, taking the service brake as an example, as shown in fig. 1 and 2, when the service brake is performed, the service motor 40 drives the service screw 61 to rotate, so that the service nut 62 sleeved on the service screw 61 moves rightwards, thereby pushing the first brake pad 31 to also move rightwards and press against the brake disc 20, and then the brake disc 20 gives a reaction force to the service nut 62 leftwards, so that the service nut 62 and the caliper body 10 integrally move leftwards until the second brake pad 32 is also pressed against the brake disc 20. At this time, the brake pads on both sides are pressed on the brake disc 20, thereby clamping the brake disc 20 and generating a friction torque for preventing the wheel from rotating, so as to realize service braking.

Alternatively, the travelling screw mechanism 60 may be a rolling screw mechanism. In the case of the ball screw mechanism, rolling bodies such as balls or rollers are provided between the nut 62 and the screw 61. Further, the screw mechanism 60 may be a planetary roller screw mechanism. Compared with other screw rod mechanisms, the planetary roller screw rod mechanism has the advantages of large bearing load, strong shock resistance, high transmission precision and long service life.

Additionally, still alternatively, the trolley screw mechanism 60 may be a ball screw mechanism. The advantageous effects of using the ball screw mechanism are similar to those of using the planetary roller screw described above, and a description thereof will be omitted here in order to avoid redundancy. However, the present disclosure is not limited thereto, and a slide screw mechanism or the like may be used as the traveling screw mechanism 60. When a sliding screw rod mechanism is adopted, the lead angle of the travelling screw rod can be larger than the self-locking angle, so that the screw pair can not be self-locked, and the return of the travelling nut can be realized by the acting force of the brake disc on the brake block when the brake is released.

In one embodiment, as shown in fig. 2 and 6, the traveling motor 40 may be an outer rotor motor, the stator 41 of the traveling motor 40 has a cavity 411 extending in the axial direction, the traveling screw mechanism 60 includes a traveling screw 61 and a traveling nut 62 sleeved on the traveling screw 61, the traveling screw 61 penetrates the cavity 411, and the rotor 42 of the traveling motor 40 drives the traveling screw 61 to rotate through the traveling speed reduction mechanism 50. In this embodiment, the traveling screw mechanism 60 is integrated inside the traveling motor 40, so that the brake is more compact in structure, occupies less space, and is convenient to install and arrange on the whole vehicle.

The traveling reduction mechanism 50 may be any suitable type of reduction mechanism as long as the output torque of the traveling motor 40 is reduced in speed and increased in torque and then transmitted to the traveling screw 61. In one embodiment, as shown in fig. 2 and 6, the reduction gear mechanism 50 may be a first planetary gear reduction mechanism including a first sun gear 51, a first planet gear 52, a first carrier 53 and a first ring gear 54, wherein the first sun gear 51 is connected to the rotor 42 of the traveling motor 40, the first carrier 53 is connected to the traveling screw 61, and the first ring gear 54 is fixed in the caliper body 10.

Optionally, a thrust bearing 70 may be mounted on the bridge screw 61. In one embodiment, as shown in fig. 2 and 6, the bridge screw 61 is formed with a step surface, and the thrust bearing 70 is disposed between the step surface and the first carrier 53. When the brake block clamps the brake disc 20, the first planet carrier 53 applies an axial force to the traveling screw rod 61 through the thrust bearing 70 to balance the reaction force of the brake disc 20 to the traveling screw rod 61, so as to ensure the stress balance of the traveling screw rod 61.

In one embodiment, the disc brake further includes a piston 90, the piston 90 is slidably fitted in one end of the cavity 411, the service retarding mechanism 50 is disposed at the other end of the cavity 411 and connected to the service screw 61, and the service nut 62 pushes the first brake pad 31 to move through the piston 90. In this embodiment, the piston 90 separates the interior of the cavity 411 from the outside, so that the traveling screw mechanism 60 is in a relatively closed environment, and is prevented from being corroded by outside water and impurities, and the service life of the brake is prolonged.

To avoid creating resistance to the movement of the piston 90, the piston 90 may be clearance fit with the cavity 411, that is, the diameter of the cavity 411 may be slightly larger than the diameter of the piston 90. In this case, in order to ensure the sealing, a sealing ring 100 may be provided between the piston 90 and the inner wall of the cavity 411 (see fig. 2) or between the piston and the caliper body 10 (see fig. 6).

Here, the traveling nut 62 may be fastened to the piston 90 by screwing, welding, gluing, etc. However, to avoid stress concentrations at the connection, in one embodiment, the service nut 62 is not coupled to the piston 90, and when service braking is performed, the service nut 62 pushes the piston 90 to move, and the piston 90 pushes the first brake pad 31 against the brake disc 20. The piston 90 may be a cylinder structure with one end closed and the other end open, the service nut 62 may be disposed in the piston 90 and in clearance fit with the inner wall of the piston 90, and when the service brake is performed, the thrust of the service nut 62 acts on the closed end of the piston 90 to push the piston 90 to move toward the brake disc 20.

In one embodiment, the parking brake unit may further include a push rod 150 for pushing the first brake pad 31 to move, and the parking motor 110 may drive the push rod 150 to move through the parking screw mechanism 130, and push the first brake pad 31 to press the brake disc 20 by using the push rod 150. In this case, the traveling screw 61 may be a hollow rod, that is, an axial hole extending in the axial direction is formed in the traveling screw 61, the traveling screw 61 penetrates the center of the traveling reduction mechanism 50, the push rod 150 penetrates the axial hole of the traveling screw 61, and the push rod 150 pushes the first brake pad 31 through the piston 90. By integrating the push rod 150 inside the traveling screw rod 61, the traveling screw rod 61 can be used for guiding the movement of the push rod 150, and the structure compactness of the brake can be further improved.

In order to increase the parking braking force, a force increasing mechanism may be provided between the parking nut mechanism 130 and the push rod 150 to amplify the output force of the parking nut mechanism 130 to be transmitted to the push rod 150.

The force amplification means may be in any suitable form. In one embodiment, as shown in fig. 1 and 3, the force amplifier mechanism may be a linkage mechanism 140. Specifically, the link mechanism 140 may include a first link 141, a second link 142, a third link 143, and a first base 144, wherein the first link 141 extends in an axial direction of the parking screw 131, a first end of the first link 141 is connected to the parking nut 132, a second end of the first link 141 is hinged to a first end of the second link 142, a second end of the second link 142 is hinged to a first end of the third link 143, a second end of the third link 143 is hinged to the first base 144, the first base 144 is fixed to the caliper body 10, one end of the push rod 150 is connected to a middle portion of the third link 143, and the other end is used for pushing the first brake pad 31, and the first link 141 is perpendicular to the push rod 150. When the parking brake is executed, the parking motor 110 drives the parking screw 131 to rotate through the parking deceleration mechanism 120, so that the parking nut 132 sleeved on the parking screw 131 moves upwards, and thus drives the first connecting rod 141 to move upwards, the first connecting rod 141 drives the third connecting rod 143 to swing to the right through the second connecting rod 142, and thus drives the push rod 150 connected to the third connecting rod 143 to move rightwards, the push rod 150 pushes the piston 90 to move backwards, and the piston 90 pushes the first brake pad 31 to move rightwards and press the brake disc 20.

In the above embodiment, the link mechanism 140 can amplify the output force of the parking screw mechanism 130, and can convert the output force of the parking screw mechanism 130 in the vertical direction into the horizontal direction to be transmitted to the push rod 150, so as to allow the driving motor 40 and the parking motor 110 to be vertically arranged, and reduce the space occupied by the brake.

Further, the link mechanism 140 may further include a fourth link 145, a fifth link 146, a second base 147 and a support rod 148, wherein a second end of the first link 141, a first end of the second link 142 and a first end of the fourth link 145 are hinged together, a second end of the fourth link 145 is hinged to a first end of the fifth link 146, a second end of the fifth link 146 is hinged to the second base 147, the second base 147 is fixed to the caliper body 10, the fourth link 145 and the second link 142 are symmetrically arranged with respect to the first link 141, the fifth link 146 and the third link 143 are symmetrically arranged with respect to the first link 141, one end of the support rod 148 is connected to a middle portion of the fifth link 146, and the other end is supported on an inner wall of the caliper body 10. Here, the fourth link 145 and the fifth link 146 are provided so that the link mechanism 140 has a symmetrical structure, thereby improving the movement coordination and flexibility of the link mechanism 140 and preventing jamming. When the parking brake is performed, the support rod 148 applies a backward supporting force to the link mechanism 140 to balance the reaction force of the push rod 150 to the link mechanism 140, so as to ensure the stress balance of the link mechanism 140 and increase the stability of the link mechanism 140.

In order to increase the force-bearing area and improve the stability of the supporting rod 148, the supporting rod 148 may be connected to the spacer 149 and supported on the inner wall of the caliper body 10 by the spacer 149.

In another embodiment, as shown in fig. 5 and 6, the force amplification mechanism may be a lever mechanism 160. Specifically, the lever mechanism 160 may include a lever 161 and a fulcrum 162, the lever 161 may be rotatably supported in the caliper body 10 around the fulcrum 162, both ends of the lever 161 are respectively hinged to the parking nut 132 and the push rod 150, and a distance between the parking nut 132 and the fulcrum 162 may be greater than a distance between the push rod 150 and the fulcrum 162, so that the output force of the parking screw mechanism 130 is amplified by the lever mechanism 160 and then transmitted to the push rod 150. In this embodiment, as shown in fig. 6, the service motor 40 and the parking motor 110 may be arranged in parallel, thereby enabling the axial dimension of the brake to be shortened, facilitating the installation and arrangement on the whole vehicle.

The parking deceleration mechanism 120 may be any appropriate type of deceleration mechanism as long as the output torque of the parking motor 110 is decelerated and increased and then transmitted to the parking screw 131. In one embodiment, as shown in fig. 3 and 6, the parking deceleration mechanism 120 may be a second planetary gear deceleration mechanism including a second sun gear 121, a second planet gear 122, a second planet carrier 123 and a second ring gear 124, wherein the second sun gear 121 is connected with the motor shaft 111 of the parking motor 110, the second planet carrier 123 is connected with the parking screw 131, and the second ring gear 124 is fixed in the caliper body 10.

In order to ensure that the parking nut 132 is still maintained at the position for implementing the parking brake after the parking motor 110 is de-energized, in one embodiment, as shown in fig. 1 and 4, the parking brake unit may further include an electromagnetic clutch 80, the electromagnetic clutch 80 is mounted on the motor shaft 111 of the parking motor 110, and the parking brake state is maintained by locking the motor shaft 111 by the electromagnetic clutch 80.

Specifically, when the electromagnetic clutch 80 is de-energized, the electromagnetic clutch 80 is engaged to lock the motor shaft 111 of the parking motor 110, so that the parking screw 131 cannot rotate, the parking nut 132 is maintained at a position where parking braking is achieved, and cannot move, and the push rod 150 maintains thrust on the first brake pad 31, and maintains a parking braking state. When the electromagnetic clutch 80 is energized, the electromagnetic clutch 80 is disengaged to release the motor shaft 111.

Alternatively, the electromagnetic clutch 80 may include a clutch housing 81, an electromagnet, a translating friction plate 85, a rotating friction plate 86, an outer race 87, and an inner race 88. The clutch housing 81 is fixed to the caliper body 10, and the electromagnet may include a fixed iron core 82, a movable iron core 83, and a drive spring 84 acting on the movable iron core 83. The inner race 88 is slidably connected to the motor shaft 111 through a spline, and the rotary friction plate 86 is provided on the inner race 88 so as to be rotatable by the motor shaft 41. The outer race 87 is slidably connected to the inner wall of the clutch housing 81 by a spline, and the translation friction plate 85 is provided on the outer race 87 so as to be able to translate in the axial direction of the motor shaft 111. The fixed iron core 82 and the movable iron core 83 can be formed into an annular structure, the movable iron core 83 is sleeved outside the motor shaft 111, and the fixed iron core 82 is sleeved outside the movable iron core 83, so that the brake is more compact in structure and smaller in axial size. When the electromagnet is de-energized, the magnetic attraction between the fixed iron core 82 and the movable iron core 83 disappears, the movable iron core 83 moves rightwards under the action of the driving spring 84 and pushes the translation friction plate 85 and the rotation friction plate 86 to be jointed, and the friction force between the translation friction plate and the rotation friction plate causes the motor shaft 111 to be locked; when the electromagnet is energized, magnetic attraction is generated between the fixed iron core 82 and the movable iron core 83, so that the movable iron core 83 is reset and simultaneously compresses the driving spring 84, the translational friction plate 85 and the rotary friction plate 86 are separated, and the friction force between the translational friction plate 85 and the rotary friction plate 86 disappears, so that the locking of the motor shaft 111 is released.

When the parking brake function needs to be executed in the driving process, the parking motor 110 is powered on and drives the push rod 150 to move through the parking deceleration mechanism 120, the parking screw rod mechanism 130 and the force increasing mechanism in sequence, the push rod 150 pushes the brake pad to clamp the brake disc 20, when the parking requirement is met (for example, the parking brake force reaches the target brake force, and the time for increasing the parking brake force from zero to the target brake force is less than the preset time), the parking motor 110 is powered off, the electromagnetic clutch 80 works to lock the motor shaft 111 of the parking motor 110, the parking brake force is maintained, and the parking brake function is executed. When the parking brake is released, the electromagnetic clutch 80 loses the holding force and releases the motor shaft 111.

In the case of using the electromagnetic clutch 80, the parking screw mechanism 130 may be a rolling screw mechanism or a sliding screw mechanism. Specifically, the parking screw mechanism 130 may be a planetary roller screw mechanism or a ball screw mechanism. The advantages of the planetary roller screw mechanism and the ball screw mechanism have been described above and will not be described in detail.

In order to ensure that the parking nut 132 is still maintained at the position for implementing the parking brake after the parking motor 110 is powered off, in another embodiment, the parking screw mechanism 130 may be a sliding screw mechanism, and the lead angle of the parking screw 131 is smaller than the self-locking angle, so that the parking screw mechanism 130 has a one-way self-locking function. In this case, when the parking motor 110 is de-energized, the parking nut 132 cannot be moved by the self-locking function of the parking screw mechanism 130 and is still maintained at the position where the parking brake is achieved, and thus the push rod 150 still maintains the thrust force to the first pad 31, so that the pad keeps clamping the brake disc 20.

In the present disclosure, the caliper body 10 may be integrally molded or may be formed by connecting a plurality of parts that are separately molded. In the embodiment shown in fig. 1, the caliper body 10 is integrally formed. In the embodiment shown in fig. 5, the caliper body 10 includes a first portion 101 and a second portion 102, the first portion 101 and the second portion 102 may be connected by a fastener, for example, the second brake pad 32 is mounted on the first portion 101, the service motor 40, the service decelerating mechanism 50, the parking motor 110, the parking decelerating mechanism 120, and the lever mechanism 160 are all disposed inside the second portion 102, a guide hole through which the piston 90 passes is provided on the first portion 101, and the seal ring 100 is disposed between the piston 90 and an inner wall of the guide hole.

The operation of the disc brake according to an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

During service braking, the parking motor 110 does not work, the rotor 42 of the service motor 40 drives the service screw 61 to rotate through the service retarding mechanism 50, so that the service nut 62 sleeved on the service screw 61 moves rightwards, the first brake pad 31 is pushed to move rightwards and is pressed on the brake disc 20, then the brake disc 20 gives a leftward reaction force to the service nut 62, the service nut 62 and the brake caliper body 10 move leftwards integrally until the second brake pad 32 is pressed on the brake disc 20, and at the moment, the brake pads on the two sides are pressed on the brake disc 20, so that the brake disc 20 is clamped, and friction torque for preventing the wheels from rotating is generated, so that service braking is realized.

During parking braking, the driving motor 40 does not work, the parking motor 110 drives the push rod 150 to move sequentially through the parking speed reducing mechanism 120, the parking screw rod mechanism 130 and the force increasing mechanism, the push rod 150 pushes the brake block to clamp the brake disc 20, when the parking requirement is met, the parking motor 110 is de-energized, the electromagnetic clutch 80 is de-energized to lock the motor shaft 111 of the parking motor 110, parking braking force is kept, and parking braking is achieved. When the parking brake needs to be released, the electromagnetic clutch 80 is energized to release the motor shaft 111 of the parking motor 110, and the parking brake force disappears.

According to another aspect of the present disclosure, a vehicle is provided, which comprises a disc brake as described above.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A disc brake is characterized by comprising a caliper body (10), a first brake block (31), a service brake unit and a parking brake unit, wherein the parking brake unit comprises a parking motor (110) and a parking screw mechanism (130), the parking motor (110) drives the first brake block (31) to move through the parking screw mechanism (130) so as to press a brake disc (20), the parking brake unit further comprises a push rod (150) used for pushing the first brake block (31) to move, the parking motor (110) drives the push rod (150) to move through the parking screw mechanism (130), the service brake unit comprises a service motor (40), a service speed reducing mechanism (50) and a service screw mechanism (60), the service motor (40) is an outer rotor motor, a stator (41) of the service motor (40) is provided with a cavity (411) extending along the axial direction, the driving screw mechanism (60) comprises a driving screw (61) and a driving nut (62) sleeved on the driving screw (61), the driving screw (61) penetrates through the cavity (411), a rotor (42) of a driving motor (40) is driven by the driving speed reducing mechanism (50), the driving screw (61) rotates, so that the driving nut (62) is axially moved along the driving screw (61), and therefore the first brake block (31) is pushed to move to compress the brake disc (20).

2. The disc brake of claim 1, characterized in that it is a floating caliper disc brake, further comprising a second brake pad (32), the first (31) and second (32) brake pads being located on either side of the brake disc (20), respectively, the second brake pad (32) being mounted on the caliper body (10).

3. The disc brake of claim 1, further comprising a link mechanism (140), wherein the output force of the parking screw mechanism (130) is increased by the link mechanism (140) and then transmitted to the push rod (150).

4. The disc brake of claim 3, characterized in that the parking screw mechanism (130) comprises a parking screw (131) and a parking nut (132) sleeved on the parking screw (131), the linkage mechanism (140) comprises a first link (141), a second link (142), a third link (143) and a first base (144), the first link (141) extends along the axial direction of the parking screw (131), a first end of the first link (141) is connected with the parking nut (132), a second end of the first link (141) is hinged with a first end of the second link (142), a second end of the second link (142) is hinged with a first end of the third link (143), a second end of the third link (143) is hinged with the first base (144), and the first base (144) is fixed on the caliper body (10), one end of the push rod (150) is connected to the middle of the third connecting rod (143), the other end of the push rod is used for pushing the first brake block (31), and the first connecting rod (141) is perpendicular to the push rod (150).

5. The disc brake of claim 4, characterized in that the linkage (140) further comprises a fourth link (145), a fifth link (146), a second base (147) and a support rod (148), the second end of the first link (141), the first end of the second link (142) and the first end of the fourth link (145) are hinged together, the second end of the fourth link (145) is hinged with the first end of the fifth link (146), the second end of the fifth link (146) is hinged with the second base (147), the second base (147) is fixed to the caliper body (10), one end of the support rod (148) is connected to the middle of the fifth link (146), the other end is supported on the caliper body (10), the fourth link (145) and the second link (142) are symmetrically arranged with respect to the first link (141), the fifth link (146) and the third link (143) are symmetrically arranged with respect to the first link (141).

6. The disc brake of claim 1, characterized in that the service screw mechanism (60) is a ball screw mechanism.

7. The disc brake of claim 1, characterized in that the service screw (61) is formed as a hollow rod, the push rod (150) being arranged through the service screw (61).

8. The disc brake of claim 1, further comprising a piston (90), the piston (90) being a sliding fit in one end of the cavity (411), the service nut (62) and the push rod (150) each being moved by the piston (90) pushing the first brake pad (31).

9. The disc brake of claim 8, characterized in that a sealing ring (100) is arranged between the piston (90) and the inner wall of the cavity (411).

10. The disc brake of claim 1, characterized in that the parking brake unit further comprises an electromagnetic clutch (80), the electromagnetic clutch (80) being engaged to lock the motor shaft (111) when the electromagnetic clutch (80) is de-energized; when the electromagnetic clutch (80) is energized, the electromagnetic clutch (80) is disengaged to release the motor shaft (111).

11. The disc brake of claim 10, characterized in that the electromagnetic clutch (80) comprises an electromagnet comprising a stationary core (82), a movable core (83) and a drive spring (84) acting on the movable core (83), a translatory friction disc (85) and a rotary friction disc (86), the rotary friction disc (86) being connected to the motor shaft (111), the translatory friction disc (85) being drivable by the movable core (83).

12. The disc brake of claim 11, characterized in that the electromagnetic clutch (80) further comprises a clutch housing (81), an outer race (87) and an inner race (88), the inner race (88) being splined to the motor shaft (111), the rotating friction plate (86) being disposed on the inner race (88), the clutch housing (81) being fixed relative to the caliper body (10), the outer race (87) being splined to an inner wall of the clutch housing (81), the translating friction plate (85) being disposed on the outer race (87).

13. The disc brake of claim 1, characterized in that the parking screw mechanism (130) comprises a parking screw (131) and a parking nut (132) fitted over the parking screw (131), the parking screw (131) having a lead angle smaller than a self-locking angle.

14. The disc brake of claim 1, characterized in that the parking brake unit further comprises a parking deceleration mechanism (120), the parking motor (110) being drivingly connected to the parking screw mechanism (130) through the parking deceleration mechanism (120).

15. A vehicle, characterized in that it comprises a disc brake according to any one of claims 1-14.