WO2019042318A1

WO2019042318A1 - Disc brake and vehicle

Info

Publication number: WO2019042318A1
Application number: PCT/CN2018/102950
Authority: WO
Inventors: 郑祖雄
Original assignee: 比亚迪股份有限公司
Priority date: 2017-08-29
Filing date: 2018-08-29
Publication date: 2019-03-07
Also published as: CN109424667A; CN109424667B

Abstract

Disclosed is a disc brake, comprising a brake caliper (10), a first brake pad (31), a brake disc (20), a service brake unit and a parking brake unit, wherein the parking brake unit comprises a parking motor (110) and a parking screw rod mechanism (130); and the parking motor (110) drives, via the parking screw rod mechanism (130), the first brake pad (31) to move to press the brake disc (20).

Description

Disc brakes and vehicles

The present application is based on a Chinese patent application filed on Jan. 29, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

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

Background technique

In the traditional hydraulic or pneumatic brake system, there are obvious disadvantages such as complicated gas-liquid pipeline, difficult maintenance, complicated layout structure, slow braking dynamic response, and low brake comfort performance. For example, in a hydraulic brake system, the brake pedal generates a rebound vibration phenomenon when the anti-lock brake system is activated, which affects the braking comfort performance. For example, since the brake pedal mechanism is directly connected to the brake transmission device and the brake actuator, the impact force generated when the vehicle collides is directly transmitted to the cab through the brake system, which seriously affects the safety performance of the vehicle. For example, in the conventional hydraulic brake system, the components of the conventional hydraulic brake system such as the vacuum brake booster, the brake master cylinder, and the oil reservoir are used, so that the structure and the assembly are complicated and bulky. Maintenance problems are difficult, and since the system is provided with hydraulic brake lines and brake fluids that connect the corresponding components, it is necessary to periodically change the hydraulic oil and periodically check for the presence of hydraulic oil leakage.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

The present disclosure provides a disc brake comprising: a brake caliper body; a first brake block; a brake disc; a service brake unit; a parking brake unit, the parking brake unit including a parking motor and a station a wire rod mechanism that drives the first brake block to move by a parking screw mechanism to press the brake disk.

According to some examples of the present disclosure, the disc brake is a float caliper disc brake, the disc brake further comprising a second brake block, the first brake block and the second brake block being respectively located The two brake pads are mounted on the brake caliper body on both sides of the brake disc.

According to some examples of the present disclosure, the parking brake unit further includes a push rod for urging movement of the first brake block, the parking motor driving the push rod by the parking screw mechanism mobile.

According to some examples of the present disclosure, the disc brake further includes a link mechanism, an output force of the parking screw mechanism being increased by the link mechanism and transmitted to the push rod.

According to some examples of the present disclosure, the parking screw mechanism includes a parking screw and a parking nut fitted on the parking screw, the linkage including a first link and a second link a third link extending along an axial direction of the parking screw, and a first end of the first link connected to the parking nut, the first a second end of a link is hinged to a first end of the second link, and a second end of the second link is hinged to a first end of the third link, the third link The second end is hinged to the first base, the first base is fixed to the caliper body, one end of the push rod is connected to the middle of the third link, and the other end is used for pushing the The first brake block is perpendicular to the push rod.

According to some examples of the present disclosure, the link mechanism further includes a fourth link, a fifth link, a second base, and a support bar, the second end of the first link, the second link The first end and the first end of the fourth link are hinged together, the second end of the fourth link is hinged with the first end of the fifth link, and the fifth link is The two ends are hinged to the second base, the second base is fixed to the brake caliper body, one end of the support rod is connected to the middle of the fifth link, and the other end is supported by the system On the movable 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 .

According to some examples of the present disclosure, the service brake unit includes a traveling motor, a traveling speed reduction mechanism, and a traveling screw mechanism, the traveling motor is an outer rotor motor, and the stator of the traveling motor has a cavity extending in the axial direction The driving screw mechanism includes a driving screw and a driving nut disposed on the driving screw, the driving screw penetrating the cavity, and the rotor of the driving motor drives the driving mechanism by the driving reduction mechanism The driving screw rotates to move the driving nut axially along the traveling screw, thereby pushing the first brake block to move to press the brake disk.

According to some examples of the present disclosure, the travel screw mechanism is a rolling screw mechanism.

According to some examples of the present disclosure, the travel screw is formed as a hollow rod that passes through the travel screw.

According to some examples of the present disclosure, the disc brake further includes a piston that is slidably fitted at one end of the cavity, and the service nut and the push rod each push the first system by the piston The moving block moves.

According to some examples of the present disclosure, a seal ring is disposed between the piston and an inner wall of the cavity.

According to some examples of the present disclosure, the parking brake unit further includes an electromagnetic clutch that engages 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.

According to some examples of the present disclosure, the electromagnetic clutch includes an electromagnet, a translational friction plate, and a rotating friction plate, the electromagnet including a fixed iron core, a moving iron core, and a drive spring acting on the movable iron core, A rotating friction plate is coupled to the motor shaft, and the translational friction plate is drivable by the moving iron core.

According to some examples of the present disclosure, 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 therein On the race, the clutch housing is fixed relative to the caliper body, the outer race is splined to an inner wall of the clutch housing, and the translational friction plate is disposed on the outer race.

According to some examples of the present disclosure, the parking screw mechanism includes a parking screw and a parking nut that fits over the parking screw, the pitch angle of the parking screw being less than a self-locking angle.

According to some examples of the present disclosure, the parking brake unit further includes a parking reduction mechanism that is coupled to the parking screw mechanism by the parking reduction mechanism.

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

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a cross-sectional view of a disc brake in accordance with an embodiment of the present disclosure;

2 to 4 are partial enlarged views of Fig. 1;

5 and 6 are cross-sectional views of a disc brake according to another embodiment of the present disclosure, wherein a complete caliper body is shown in FIG. 5, and a partial caliper body is omitted in FIG. 6;

FIG. 7 is a bottom view of a vehicle in accordance with an embodiment of the present disclosure.

Detailed ways

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or component referred to must have a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting the invention.

It should be noted that the terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. Further, in the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specified.

According to an aspect of the present disclosure, a disc brake is provided, as shown in FIGS. 1 and 5, including a brake caliper body 10, a first brake block 31, a service brake unit, and a parking brake unit, and a driving system The moving unit and the parking brake unit are mounted in the caliper body 10, and the first brake block 31 is slidably mounted in the caliper body 10 and on one side of the brake disk 20. The service brake unit includes a traveling motor 40 and a driving screw mechanism 60. The driving motor 40 drives the first brake block 31 to move by the driving screw mechanism 60 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 brake block 31 to move by the parking screw mechanism 130 to press the brake disk 20.

The disc brake of the present disclosure may be a fixed caliper disc brake or a float caliper disc brake. The caliper body of the fixed caliper disc brake is fixedly mounted on the vehicle body and cannot be moved relative to the vehicle body. The caliper body of the float caliper disc brake is slidably mounted on the vehicle body and is movable relative to the vehicle body in the same direction as the axial direction of the brake disc.

In the case where the disc brake of the present disclosure is a float caliper disc brake, the brake further includes a second brake block 32 mounted on the caliper body 10 and located on the brake disc 20 On the other side, the caliper body 10 is axially movable relative to the brake disc 20. Specifically, taking the service brake as an example, as shown in FIG. 1 and FIG. 2, when the service brake is executed, the driving motor 40 drives the driving screw 61 to rotate so that the driving nut 62 fitted on the driving screw 61 is rightward. Moving, thereby pushing the first brake block 31 to also move to the right and press it onto the brake disc 20, so that the brake disc 20 gives the driving nut 62 a leftward reaction force, which is transmitted to the caliper body. 10, the caliper body 10 is moved to the left, and the caliper body 10 drives the second brake block 32 to move until the second brake block 32 is also pressed against the brake disk 20. At this time, the brake pads on both sides are pressed against the brake disc 20, thereby clamping the brake disc 20, generating a friction torque that prevents the rotation of the wheel, and realizing the service brake.

Alternatively, the travel screw mechanism 60 can be a rolling screw mechanism. In the case of a rolling screw mechanism, a rolling body such as a ball or a roller is disposed between the nut 62 and the screw 61. Further, the screw mechanism 60 can be a planetary roller screw mechanism. Compared with other screw mechanisms, the planetary roller screw mechanism has the advantages of large load bearing capacity, strong impact resistance, high transmission precision and long service life.

Additionally, optionally, the travel screw mechanism 60 can be a ball screw mechanism. The advantageous effects of using the ball screw mechanism are similar to those of the above-described planetary roller screw, and the description thereof will be omitted herein to avoid redundancy. However, the present disclosure is not limited thereto, and the driving screw mechanism 60 may also employ a sliding screw mechanism or the like. When the sliding screw mechanism is adopted, the threading angle of the driving screw can be made larger than the self-locking angle to ensure that the screw pair does not self-lock, so that the braking force can be applied to the braking block when the braking is released. Realize the return of the running nut.

In one embodiment, as shown in FIGS. 2 and 6, the service motor 40 may be an outer rotor motor, and the stator 41 of the traveling motor 40 has a cavity 411 extending in the axial direction, and the driving screw mechanism 60 includes a driving screw 61 and a service nut 62 fitted to the travel screw 61, the travel screw 61 extends through the cavity 411, and the rotor 42 of the travel motor 40 drives the travel screw 61 to rotate by the service reduction mechanism 50. In this embodiment, by integrating the driving screw mechanism 60 into the interior of the traveling motor 40, the brake structure is more compact and takes up less space, facilitating installation on the entire vehicle.

The service speed reduction mechanism 50 may be any appropriate type of speed reduction mechanism as long as the output torque of the service motor 40 can be reduced and torqued and transmitted to the travel screw 61. In an embodiment, as shown in FIG. 2 and FIG. 6 , the driving speed reduction mechanism 50 may be a first planetary gear speed reduction mechanism, and the first planetary gear speed reduction mechanism includes a first sun gear 51 , a first planetary gear 52 , and a first a carrier 53 and a first ring gear 54, wherein the first sun gear 51 is coupled to the rotor 42 of the service motor 40, the first planet carrier 53 is coupled to the travel screw 61, and the first ring gear 54 is fixed to the brake caliper body Within 10.

Alternatively, the thrust bearing 70 may be mounted on the driving screw 61, that is, the thrust bearing 70 is sleeved on the driving screw 61. In one embodiment, as shown in FIGS. 2 and 6, the travel screw 61 is formed with a stepped surface, and the thrust bearing 70 is disposed between the stepped surface and the first planet carrier 53. When the brake block clamps the brake disk 20, the first carrier 53 applies an axial force to the traveling screw 61 through the thrust bearing 70 to balance the reaction force of the brake disk 20 with the driving screw 61, thereby ensuring the driving screw 61. Stress balanced.

In an embodiment, the disc brake may further include a piston 90 that is slidably fitted to one end of the cavity 411, and the driving speed reduction mechanism 50 is disposed at the other end of the cavity 411 and connected to the driving screw 61. The service nut 62 urges the first brake block 31 to move by the piston 90. In this embodiment, the piston 90 separates the interior of the cavity 411 from the outside, so that the driving screw mechanism 60 is in a relatively closed environment, avoiding the erosion of external water and impurities, and prolonging the service life of the brake. .

To avoid creating resistance to the movement of the piston 90, the piston 90 can be clearance-fitted with the cavity 411, that is, the diameter of the cavity 411 can be slightly larger than the diameter of the piston 90. In this case, in order to ensure the sealing property, the seal 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 service nut 62 can be fixed to the piston 90 by screwing, welding, gluing or the like. However, in order to avoid stress concentration at the joint, in one embodiment, the service nut 62 is not connected to the piston 90. When the service brake is performed, the service nut 62 pushes the piston 90 to move, and the piston 90 pushes the first brake block again. 31 is pressed onto the brake disc 20. The piston 90 may have a cylindrical structure with one end closed and the other end open. The service nut 62 may be disposed in the piston 90 and is in clearance with the inner wall of the piston 90. When the service brake is performed, the thrust of the service nut 62 acts on the closed end of the piston 90. The piston 90 is pushed to move toward the brake disc 20.

In an embodiment, the parking brake unit may further include a push rod 150 for pushing the first brake block 31 to move, and the parking motor 110 may drive the push rod 150 to move by the parking screw mechanism 130, using the push The lever 150 urges the first brake pad 31 to press the brake disk 20. In this case, further, the driving screw 61 may be formed as a hollow rod, that is, the driving screw 61 is formed with an axial hole extending in the axial direction, and the driving screw 61 penetrates the center of the traveling speed reduction mechanism 50, and the push rod 150 passes through the shaft hole of the driving screw 61, and the push rod 150 also pushes the first brake block 31 through the piston 90. By integrating the push rod 150 into the inside of the driving screw 61, the movement of the push rod 150 can be guided by the driving screw 61, and the structural compactness of the brake can be further improved.

In order to increase the parking brake force, a boosting 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 and transmit it to the push rod 150.

The booster mechanism can be in any suitable form. In one embodiment, as shown in FIGS. 1 and 3, the boosting mechanism can be a linkage 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 the axial direction of the parking screw 131 The first end of the first link 141 is connected to the parking nut 132, the second end of the first link 141 is hinged with the first end of the second link 142, and the second end of the second link 142 is connected to the third end. The first end of the connecting rod 143 is hinged, the second end of the third connecting rod 143 is hinged with the first base 144, the first base 144 is fixed to the caliper body 10, and one end of the push rod 150 is connected to the third connecting rod The middle portion of the 143 is used to push the first brake block 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 by the parking reduction mechanism 120, so that the parking nut 132 fitted on the parking screw 131 moves upward, thereby driving the first link 141 upward. Moving, the first link 141 drives the third link 143 to swing to the right through the second link 142, thereby driving the push rod 150 connected to the third link 143 to move to the right, and the push rod 150 pushes the piston 90 to move backward. The piston 90 urges the first brake block 31 to move to the right and press it onto the brake disk 20.

In the above embodiment, the link mechanism 140 can enlarge the output force of the parking screw mechanism 130 on the one hand, and can convert the output force of the parking screw mechanism 130 in the vertical direction to the horizontal direction to the push rod 150 on the other hand. Thus, it is possible to allow the running motor 40 and the parking motor 110 to be vertically arranged, reducing 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 the second end of the first link 141 and the second link 142 The first end 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, and the second end of the fifth link 146 is second and second. The base 147 is hinged, 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, and the fifth link 146 and the third link 143 are The first link 141 is symmetrically arranged, one end of the support rod 148 is connected to the middle of the fifth link 146, and the other end is supported on the inner wall of the caliper body 10. Here, by providing the fourth link 145 and the fifth link 146, the link mechanism 140 is formed in a symmetrical structure, so that the motion coordination and flexibility of the link mechanism 140 can be improved to avoid sticking. When the parking brake is executed, the support rod 148 applies a rearward supporting force to the link mechanism 140 to balance the reaction force of the push rod 150 against the link mechanism 140, to ensure the balance of the link mechanism 140, and to increase the link mechanism 140. Stability.

In order to increase the force receiving area and improve the stability of the support rod 148, the support rod 148 may be coupled to the spacer 149 and supported by the spacer 149 on the inner wall of the caliper body 10.

In another embodiment, as shown in FIGS. 5 and 6, the boosting mechanism can be a lever mechanism 160. Specifically, the lever mechanism 160 may include a lever 161 and a fulcrum 162, and the lever 161 is rotatably supported in the caliper body 10 around the fulcrum 162, and both ends of the lever 161 are respectively hinged to the parking nut 132 and the push rod 150, parking The distance between the nut 132 and the fulcrum 162 may be greater than the distance between the push rod 150 and the fulcrum 162 such that the output force of the parking screw mechanism 130 is amplified by the lever mechanism 160 and transmitted to the push rod 150. In this embodiment, as shown in FIG. 6, the traveling motor 40 and the parking motor 110 can be arranged in parallel, whereby the axial size of the brake can be shortened, and the mounting arrangement on the entire vehicle can be facilitated.

The parking speed reduction mechanism 120 may be any appropriate type of speed reduction mechanism as long as the output torque of the parking motor 110 can be reduced and torqued and transmitted to the parking screw 131. In an embodiment, as shown in FIG. 3 and FIG. 6 , the parking reduction mechanism 120 may be a second planetary gear reduction mechanism, and the second planetary gear reduction mechanism includes a second sun gear 121 , a second planetary gear 122 , a second planet carrier 123 and a second ring gear 124, wherein the second sun gear 121 is coupled to the motor shaft 111 of the parking motor 110, the second planet carrier 123 is coupled to the parking screw 131, and the second ring gear 124 is fixed to Inside the caliper body 10.

In order to ensure that the parking motor 132 is de-energized, the parking nut 132 can still remain in the position to achieve the parking brake. In one embodiment, as shown in FIGS. 1 and 4, the parking brake unit may further include The electromagnetic clutch 80 is mounted on the motor shaft 111 of the parking motor 110, and the parking brake state is maintained by the lock of 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 such that the parking screw 131 cannot be rotated, thereby maintaining the parking nut 132 in the parking brake. The position cannot be moved, so that the push rod 150 maintains the thrust on the first brake block 31 and maintains the parking brake 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 translational friction plate 85, a rotating friction plate 86, an outer race 87, and an inner race 88. The clutch housing 81 is fixed relative 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 coupled to the motor shaft 111 via a spline, and the rotary lining 86 is disposed on the inner race 88 to be rotatable by the motor shaft 41. The outer race 87 is slidably coupled to the inner wall of the clutch housing 81 by a spline, and the translational friction plate 85 is disposed on the outer race 87 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 may be formed in an annular structure, and the movable iron core 83 is sleeved on the outside of the motor shaft 111, and the fixed iron core 82 is sleeved on the outside of the movable iron core 83 to make the structure of the brake more Compact and smaller in axial dimensions. When the electromagnet loses power, the magnetic attraction between the fixed iron core 82 and the movable iron core 83 disappears, the movable iron core 83 moves to the right under the action of the drive spring 84, and pushes the translational friction plate 85 and the rotary friction plate 86 to engage. The friction between the two causes the motor shaft 111 to be locked; when the electromagnet is energized, a magnetic attraction force is generated between the fixed iron core 82 and the movable iron core 83, so that the movable iron core 83 is reset while compressing the drive spring 84. The translational friction plate 85 and the rotary friction plate 86 are separated, and the frictional force between them disappears to release the locking of the motor shaft 111.

When the parking brake function needs to be executed during the driving process, the parking motor 110 is powered, and sequentially moves through the parking reduction mechanism 120, the parking screw mechanism 130, and the boosting mechanism to drive the push rod 150, and the push rod 150 pushes the brake. The block clamps the brake disc 20 to meet the parking requirement (for example, the parking brake force reaches the target braking force, and the parking brake force increases from zero to the target braking force for less than the preset time), the parking motor 110 is de-energized, and the electromagnetic clutch 80 is operated to lock the motor shaft 111 of the parking motor 110, maintain the parking brake force, and perform the parking brake function. When the parking brake is released, the electromagnetic clutch 80 loses the locking force and releases the motor shaft 111.

In the case where the electromagnetic clutch 80 is employed, the parking screw mechanism 130 may optionally employ 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 previously described and will not be described herein.

In order to ensure that the parking motor 132 is de-energized, the parking nut 132 can still remain in the position to achieve the parking brake. In another embodiment, the parking screw mechanism 130 can be a sliding screw mechanism and parked. The threaded angle of the lead 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 loses power, the parking nut 132 cannot be moved by the self-locking function of the parking screw mechanism 130, and remains in the position where the parking brake is realized, whereby the push rod 150 The thrust on the first brake block 31 is still maintained such that the brake block remains clamped to the brake disk 20.

In the present disclosure, the caliper body 10 may be integrally formed or may be connected by a plurality of partially formed parts. In the embodiment shown in Figure 1, the caliper body 10 is integrally formed. In the embodiment illustrated in Figure 5, the caliper body 10 includes a first portion 101 and a second portion 102, the first portion 101 and the second portion 102 being connectable, for example, by fasteners, and the second brake block 32 being mounted at In a portion 101, the driving motor 40, the traveling speed reduction mechanism 50, the parking motor 110, the parking reduction mechanism 120, and the lever mechanism 160 are all disposed inside the second portion 102, and the first portion 101 is provided with a guide for the piston 90 to pass through. A hole, the seal ring 100 is disposed between the piston 90 and the inner wall of the guide hole.

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

When the service brake is applied, the parking motor 110 does not operate, and the rotor 42 of the traveling motor 40 drives the driving screw 61 to rotate by the driving speed reduction mechanism 50, so that the driving nut 62 fitted on the driving screw 61 moves to the right, thereby pushing the first A brake block 31 also moves to the right and is pressed against the brake disc 20, so that the brake disc 20 gives a leftward reaction force to the service nut 62, causing the service nut 62 to move to the left along with the caliper body 10 as a whole. Until the second brake block 32 is also pressed against the brake disc 20, the brake pads on both sides are pressed against the brake disc 20, thereby clamping the brake disc 20, generating a frictional moment that prevents the wheel from rotating. Realize the service brake.

When the parking brake is performed, the driving motor 40 does not work, and the parking motor 110 sequentially moves through the parking reduction mechanism 120, the parking screw mechanism 130, and the boosting mechanism to drive the push rod 150, and the push rod 150 pushes the brake block clamping system. When the driving plate 20 reaches the parking request, the parking motor 110 loses power, and the electromagnetic clutch 80 loses power to lock the motor shaft 111 of the parking motor 110, and maintains the parking braking force to realize the parking brake. 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.

In accordance with another aspect of the present disclosure, a vehicle 200 is provided that includes a disc brake as described above.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. Particular features, structures, materials or features described in the examples or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims

A disc brake characterized by comprising:

Brake caliper body;

First brake block;

Brake disc

Service brake unit;

a parking brake unit, the parking brake unit includes a parking motor and a parking screw mechanism, and the parking motor drives the first brake block to move to press the brake disk by a parking screw mechanism .
The disc brake according to claim 1, wherein said disc brake is a float caliper disc brake, said disc brake further comprising a second brake pad, said first brake pad and said Second brake pads are respectively located on both sides of the brake disc, and the second brake block is mounted on the brake caliper body.
A disc brake according to claim 1 or 2, wherein said parking brake unit further includes a push rod for pushing said first brake block to move, said parking motor passing said station A lead screw mechanism drives the push rod to move.
A disc brake according to claim 3, wherein said disc brake further comprises a link mechanism, and an output force of said parking screw mechanism is increased by said link mechanism and transmitted to said push Rod.
A disc brake according to claim 4, wherein said parking screw mechanism comprises a parking screw and a parking nut fitted to said parking screw, said linkage mechanism comprising first a connecting rod, a second connecting rod, a third connecting rod and a first base, the first connecting rod extending along an axial direction of the parking screw, the first end of the first connecting rod and the resident a vehicle nut is coupled, a second end of the first link is hinged to a first end of the second link, and a second end of the second link is hinged to a first end of the third link a second end of the third link is hinged to the first base, the first base is fixed to the caliper body, and one end of the push rod is connected to a middle of the third link The other end is for pushing the first brake block, and the first link is perpendicular to the push rod.
The disc brake according to claim 5, wherein said link mechanism further comprises a fourth link, a fifth link, a second base, and a support rod, the second end of said first link a first end of the second link and a first end of the fourth link are hinged together, and a second end of the fourth link is hinged to a first end of the fifth link a second end of the fifth link is hinged to the second base, the second base is fixed to the brake caliper body, and one end of the support rod is connected to a middle portion of the fifth link. The other end 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 related to The first link is symmetrically arranged.
The disc brake according to any one of claims 3-6, wherein the service brake unit comprises a driving motor, a driving speed reduction mechanism and a driving screw mechanism, and the driving motor is an outer rotor motor. The stator of the traveling motor has a cavity extending in the axial direction, the driving screw mechanism comprising a driving screw and a driving nut fitted on the driving screw, the driving screw penetrating the cavity, The rotor of the traveling motor drives the driving screw to rotate by the driving speed reduction mechanism to move the driving nut axially along the driving screw, thereby pushing the first brake block to move to press the system Moving plate.
A disc brake according to claim 7, wherein said driving screw mechanism is a rolling screw mechanism.
A disc brake according to claim 7 or 8, wherein the driving screw is formed as a hollow rod, and the push rod passes through the driving screw.
A disc brake according to claim 9, wherein said disc brake further includes a piston that is slidably fitted to one end of said cavity, said driving nut and said push rod passing through said The piston pushes the first brake block to move.
The disc brake according to claim 10, wherein a seal ring is disposed between the piston and an inner wall of the cavity.
A disc brake according to any one of claims 1 to 11, wherein the parking brake unit further includes an electromagnetic clutch that engages to lock when the electromagnetic clutch is de-energized The motor shaft; when the electromagnetic clutch is energized, the electromagnetic clutch is disengaged to release the motor shaft.
A disc brake according to claim 12, wherein said electromagnetic clutch comprises an electromagnet, a translational friction plate and a rotary friction plate, said electromagnet comprising a fixed iron core, a moving iron core and a moving iron a driving spring of the core, the rotating friction plate being coupled to the motor shaft, the translational friction plate being drivable by the moving iron core.
A disc brake according to claim 13, wherein said electromagnetic clutch further comprises a clutch housing, an outer race and an inner race, said inner race being splined to said motor shaft, said rotation a friction plate is disposed on the inner race, the clutch housing is fixed relative to the brake caliper body, the outer race is splined to an inner wall of the clutch housing, and the translational friction plate is disposed at On the outer race.
The disc brake according to any one of claims 1 to 14, wherein the parking screw mechanism comprises a parking screw and a parking nut fitted on the parking screw, The threaded angle of the parking screw is less than the self-locking angle.
The disc brake according to any one of claims 1 to 15, wherein the parking brake unit further includes a parking reduction mechanism, and the parking motor is coupled to the parking speed reduction mechanism The parking screw mechanism.
A vehicle characterized by comprising the disc brake according to any one of claims 1-16.