Driving device, braking system and vehicle

Abstract

The application relates to the technical field of automobile brake systems, in particular to a driving device, a brake system and a vehicle. The driving device comprises a screw rod, a screw nut, a fixing base and a stop unit. The screw rod is provided with a weight-reducing shaft hole; the screw nut comprises a first sleeve and a second sleeve; the first sleeve is detachably connected with the second sleeve; the second sleeve is screw transmissionally connected with the screw rod; and the axial both ends of the second sleeve are penetrated. The screw nut is slidingly connected with the fixing base along the axial direction of the screw nut; the stop unit comprises a first stop block and a second stop block; the end of the screw rod, which faces the first sleeve, is provided with a first accommodating annular groove; the first stop block is fixedly connected with the screw rod; the first stop block is located in the first accommodating annular groove; and the second stop block is fixedly connected with the inner wall of the first sleeve. The brake system comprises the driving device. The vehicle comprises the brake system. Thus, the problem that the axial space occupied by the screw rod in the brake system is too large is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile braking systems, in particular to a driving device, a braking system and a vehicle. BACKGROUND

[0002] A brake is a mechanical device that generates resistance through friction, electromagnetic, etc. physical action to slow down or stop moving mechanical parts, or to clamp static parts to prevent accidental movement. It is a core component to ensure the safety of equipment operation and control the motion state. The motor-driven disc brake is a disc brake that uses a motor as a driving source to realize the braking function, mainly applied to the electric parking brake system of the automobile and some industrial equipment. The core of the motor-driven disc brake is composed of a brake disc, a brake caliper, a brake pad, a piston, and a motor, a reduction gear set, and a screw rod mechanism. The brake disc rotates with the wheel, the brake caliper is fixed on the axle or the steering knuckle, the internal brake pad is divided on both sides of the brake disc, the motor is linked with the reduction gear set and the screw rod mechanism in sequence, and one end of the screw rod is connected with the piston or the brake pad. During normal driving, high-pressure brake fluid pushes the piston to move the brake pad to clamp the brake disc to achieve deceleration. During parking brake, the motor is powered on to rotate, the torque is amplified by the reduction gear set, the screw rod is rotated, the screw rod converts the rotary motion into linear motion through cooperation with the nut, and the piston or the brake pad is pushed to make the brake pads on both sides tightly clamp the brake disc to prevent the vehicle from rolling. When the parking is released, the motor is reversed to drive the screw rod to retreat, and the piston and the brake pad are reset under the elastic action of the return spring and the sealing ring, the brake disc is loosened, and the wheel is free to rotate. The whole considers the stability of the driving brake and the reliability of the parking brake.

[0003] The screw transmission part and the stop structure of the screw rod are arranged along the axial direction of the screw rod, thereby occupying a large axial space. Therefore, the braking system occupies a large space. SUMMARY

[0004] To solve the problem of the large axial space occupied by the screw rod in the braking system, the present application provides a driving device, a braking system and a vehicle.

[0005] In a first aspect, the present application provides a driving device, comprising:

[0006] A screw rod having a weight-reducing shaft hole; the weight-reducing shaft hole penetrates through both ends of the screw rod along the axial direction of the screw rod;

[0007] The lead screw nut includes a first sleeve and a second sleeve; the first sleeve and the second sleeve are detachably connected; the second sleeve is helically connected to the lead screw; the two ends of the second sleeve are axially connected; the end of the first sleeve near the second sleeve is open; the end of the first sleeve away from the second sleeve is closed; the outer end face of the first sleeve away from the second sleeve is a mounting surface.

[0008] A fixed base is provided, wherein the lead screw and the fixed base are slidably connected along the axial direction of the lead screw; the lead screw and the fixed base are capable of relative rotation.

[0009] The stop unit includes a first stop block and a second stop block; a first receiving annular groove is formed at the end of the lead screw facing the first sleeve; the first receiving annular groove extends to the weight-reducing shaft hole; the first stop block is fixedly connected to the lead screw; the first stop block is located in the first receiving annular groove; the second stop block is fixedly connected to the inner wall of the first sleeve; the first stop block and the second stop block are respectively equidistant from the axis of the lead screw.

[0010] In some embodiments, there is a gap between the end face of the lead screw facing the first sleeve and the first stop block.

[0011] In some embodiments, the stop unit further includes a first elastic pad; the first elastic pad is fixedly connected to a surface of the second stop block perpendicular to the axis of the second sleeve; the dimension of the second stop block along the axial direction of the lead screw is greater than the dimension of the first receiving annular groove along the axial direction of the lead screw; when the first stop block abuts against the second stop block, the first elastic pad is in a compressed state.

[0012] In some embodiments, the driving device includes a warning unit; the warning unit includes a first reference portion and a second reference portion; the first reference portion is disposed on the outer peripheral wall of the lead screw; the second reference portion is disposed on the lead nut; when the first stop block and the second stop block are in contact, there is a first distance between the first reference portion and the second reference portion along the circumferential direction of the lead screw; the first distance is greater than a threshold value.

[0013] In some embodiments, the first reference portion includes a reference block; the reference block is fixedly connected to the lead screw; the end face of the reference block facing the lead screw nut is a first helical surface; the axis of the first helical surface is coaxial with the lead screw; the reference block has a first reference surface; the angle between the first reference surface and the axis of the lead screw is less than 10°.

[0014] The second reference part comprises a spiral groove; the spiral groove is located at the end of the second sleeve towards the reference block; the spiral groove has an adjacent second helical surface and a second reference surface; the axis of the second helical surface is coaxial with the screw nut; the included angle between the second reference surface and the axis of the screw nut is less than 10°.

[0015] In the state that the first stop block and the second stop block abut, the distance between the first reference surface and the second reference surface along the circumferential direction of the screw rod is a first distance; the distance between the first helical surface and the second helical surface along the axial direction of the screw rod is a second distance; the first distance is greater than the second distance.

[0016] In some embodiments, the pre-warning unit further comprises a second elastic pad; the second elastic pad is located between the first helical surface and the second helical surface; the second elastic pad is fixedly connected with the second helical surface.

[0017] In some embodiments, the driving device further comprises a transmission gear; the transmission gear is fixedly connected with the screw rod.

[0018] In some embodiments, the driving device further comprises a bearing; the inner ring of the bearing is integrally formed with the screw rod.

[0019] In a second aspect, the present application provides a brake system, the brake system comprising the driving device of any one of the first aspect, the brake system further comprising:

[0020] A brake caliper support, the screw rod of the driving device is rotationally connected with the brake caliper support; the fixed seat of the driving device is fixedly connected with the brake caliper support;

[0021] A piston, the piston is slidingly connected with the brake caliper support; the screw nut of the driving device is fixedly connected with the piston;

[0022] A brake block, the piston is fixedly connected with the brake block;

[0023] A brake disc, the brake disc is used for rotating with the wheel; the brake block abuts against the brake disc to realize braking.

[0024] In a third aspect, the present application provides a vehicle, the vehicle comprising the brake system of the second aspect, the vehicle further comprising:

[0025] A vehicle body;

[0026] A wheel, the wheel is rotationally connected with the vehicle body;

[0027] The brake disc of the brake system is fixedly connected with the wheel; the brake caliper support is fixedly connected with the vehicle body.

[0028] To solve the problem of the excessive axial space occupied by the screw rod in the brake system, the application has the following advantages:

[0029] By setting the weight-reducing shaft hole penetrating through both ends in the axial direction on the inner circumferential wall of the screw rod, the weight can be reduced while meeting the design size requirements, realizing the lightweight design of the driving device. The nut is composed of a first sleeve and a second sleeve connected in a detachable manner. The second sleeve is in screw transmission connection with the screw rod and penetrates through both ends in the axial direction. One end of the first sleeve is open and the other end is closed. The outside of the closed end is the assembly surface. The detachable nut structure makes the closed first sleeve not easily interfere with the assembly of the nut, thereby having the effect of facilitating installation, improving production efficiency, and realizing power transmission between the rotation of the screw rod and the axial movement of the nut.

[0030] The nut and the fixed seat are in sliding connection in the axial direction of the screw rod. The screw rod and the fixed seat can rotate relative to each other. After receiving the brake command, the motor drives the screw rod to rotate and push the nut to move, and then the nut pushes the piston to drive the brake block to abut against the brake disc to realize braking. The first stop block of the stop unit is fixed in the first accommodating ring groove at the end of the screw rod, and the second stop block is fixed on the inner wall of the first sleeve. The distance from the screw rod axis of the two is equal, and they can abut when the motor fails and the screw rod moves to the limit, preventing damage to the components. At the same time, the design of the first accommodating ring groove makes the stop unit and the screw transmission part of the screw rod partially overlap in the axial direction of the screw rod, thus saving axial space and helping to miniaturize the device. In addition, the detachable nut structure makes it easy to process after the stop unit is built into the screw rod. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A cross-sectional view of the driving device of embodiment one is shown;

[0032] Figure 2 A structural schematic diagram of the screw rod and the nut of the driving device of embodiment one is shown;

[0033] Figure 3 A structural schematic diagram of the screw rod of the driving device of embodiment one is shown;

[0034] Figure 4 A structural schematic diagram of the nut of the driving device of embodiment one is shown.

[0035] Reference numerals: 10 driving device; 11 screw rod; 111 weight-reducing shaft hole; 112 first accommodating ring groove; 12 nut; 121 first sleeve; 122 second sleeve; 13 fixing seat; 14 stop unit; 141 first stop block; 142 second stop block; 143 first elastic pad; 15 early warning unit; 151 first reference part; 1511 reference block; 1512 first helical surface; 1513 first reference surface; 152 second reference part; 1521 helical groove; 1522 second helical surface; 1523 second reference surface; 1524 second elastic pad; 16 transmission gear; 17 bearing. DETAILED DESCRIPTION

[0036] The present disclosure will now be discussed with reference to several example embodiments. It should be appreciated that these embodiments are discussed only to better illustrate the present disclosure and are not intended to limit the scope of the present disclosure in any way.

[0037] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "includes, but is not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment." The term "another embodiment" is to be read as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for orientation or positional relationship based on the orientation or position as shown in the drawings. These terms are used merely for the purpose of description and are not meant to limit the indicated device, element, or component to a particular orientation or configuration, unless otherwise specified. Also, the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and the like could be used herein in relation to a particular orientation or position of an element, and could also be used herein in relation to another orientation or position of the same element, depending on the context in which the terms are used. The specific meaning of these terms should be understood based on the specific context in which they are used. Furthermore, the terms "mount," "set," "provided with," "connected," "linked" should be interpreted broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; or it can be internal connection between two devices, elements or components. The specific meaning of these terms should be understood based on the specific context in which they are used. In addition, the terms "first," "second," and the like are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "multiple" is two or more.

[0038] A brake is a device that generates resistance through physical actions such as friction and electromagnetism, and is a core component for ensuring the safety of equipment operation and controlling the motion state. The motor-driven disc brake is a disc brake that uses a motor as a driving source to realize the braking function, and is mainly applied to the electric parking brake system of a vehicle and some industrial equipment. The brake mainly consists of a screw rod and a nut, and a screw transmission is formed by the two. The brake also includes a stop mechanism that plays a protective role. The screw transmission part of the screw rod is usually arranged along the axial direction of the screw rod with the stop structure, thereby occupying a large axial space. The brake system occupies a large space.

[0039] To solve the problem of the screw rod occupying too much axial space in the brake system, the application provides a driving device 10, a brake system and a vehicle.

[0040] Embodiment one:

[0041] The embodiment provides a driving device 10, as shown in the drawings. Figure 1 The inner hole of the nut 12 is processed with an internal thread, and the outer circle of the screw rod 11 is processed with an external thread, and the two are formed into a screw pair through thread engagement or installation of a ball. Under the premise of limiting the rotation of the nut 12, when the screw rod 11 is actively rotated, the nut 12 will move linearly along the axial direction of the screw rod 11.

[0042] The screw rod 11 has a weight-reducing shaft hole 111; the weight-reducing shaft hole 111 penetrates through both ends of the screw rod 11 along the axial direction of the screw rod 11; thus, the weight-reducing shaft hole 111 is arranged on the inner circumferential side of the screw rod 11, so that the weight of the screw rod 11 can be reduced while meeting the design size requirements of the screw rod 11, and thus the weight of the driving device 10 is reduced, and a lightweight design is achieved.

[0043] The nut 12 comprises a first sleeve 121 and a second sleeve 122; the first sleeve 121 is detachably connected with the second sleeve 122; the second sleeve 122 is in screw transmission connection with the screw rod 11; the axial both ends of the second sleeve 122 are penetrated; one end of the first sleeve 121 close to the second sleeve 122 is in an open state; one end of the first sleeve 121 away from the second sleeve 122 is in a closed state; the outer side end face of the first sleeve 121 away from the second sleeve 122 is a mounting face; the first sleeve 121 and the second sleeve 122 are arranged to be detachably connected to form the nut 12, so that the second sleeve 122 can be sleeved on the outer circumferential side of the screw rod 11, and the ball can be installed into the raceway between the second sleeve 122 and the screw rod 11, and then the first sleeve 121 can be sleeved on the outer circumferential side of the screw rod 11 and connected with the second sleeve 122. Thus, the function that the nut 12 and the screw rod 11 can rotate relative to each other on the same axis can be achieved, so as to convert the linear speed of the screw rod 11 rotating around its own axis into the linear speed of the nut 12 moving in the axial direction of its own axis, that is, the rotation of the screw rod 11 drives the nut 12 to move in the axial direction. And the detachable connection of the first sleeve 121 and the second sleeve 122 makes the process of installing the ball more convenient, and thus improves the production efficiency.

[0044] The nut 12 and the fixed seat 13 are in sliding connection along the axial direction of the nut 12; the screw rod 11 and the fixed seat 13 can rotate relative to each other; thus, after the screw rod 11 is rotated by the motor and drives the nut 12 to move in the axial direction after receiving the braking instruction, the nut 12 can drive the fixed seat 13 to move in the axial direction, and then drive the piston or the brake pad, so that the brake pad clamps the brake disc to achieve braking. A slot can be formed in the inner circumferential wall of the fixed seat 13 in the axial direction, and a protrusion can be arranged on the outer circumferential wall of the nut 12 and can be accommodated in the slot, so that the fixed seat 13 can limit the rotation in the circumferential direction, and the nut 12 can only move linearly in the circumferential direction.

[0045] The stop unit 14 comprises a first stop block 141 and a second stop block 142; the first accommodating annular groove 112 is formed in the end of the lead screw 11 towards the first sleeve 121; the first accommodating annular groove 112 penetrates to the weight-reducing shaft hole 111; that is, the first accommodating annular groove 112 is formed in the inner circumferential wall of the lead screw 11, so that the first accommodating annular groove 112 shares a distance in the axial direction with the thread groove on the outer circumferential side of the lead screw 11, thereby saving the space occupied by the lead screw 11 in the axial direction, and further saving the space occupied by the driving device 10 in the axial direction, thereby achieving the design requirement of small volume of the driving device 10. The first stop block 141 is fixedly connected with the lead screw 11; the first stop block 141 is located in the first accommodating annular groove 112; the second stop block 142 is fixedly connected with the inner wall of the first sleeve 121; the distance from the first stop block 141 to the axis of the lead screw 11 is equal to the distance from the second stop block 142 to the axis of the lead screw 11. In this way, when the motor fails, if the lead screw 11 moves to the limit distance in the axial direction towards the first sleeve 121, the first stop block 141 and the second stop block 142 collide, which forces the lead screw 11 to stop rotating, and further forces the nut 12 to stop moving, thereby protecting the lead screw 11 and the nut 12 from being damaged by collision. The first surface on the first stop block 141 is perpendicular to the axis of the lead screw 11; the first surface is arranged towards the nut 12, that is, the first surface is arranged towards the outer side of the lead screw 11. When the first stop block 141 abuts against the second stop block to limit the rotation of the first stop block, the end face of the lead screw 11 extending into the nut 12 has a first redundant gap with the nut 12, and the first surface has a second redundant gap with the inner wall of the nut 12. The first redundant gap is greater than 0, and the second redundant gap is greater than 0.

[0046] Further, as shown in Figure 1 the end face of the lead screw 11 towards the first sleeve 121 has a gap with the first stop block 141. In this way, when the lead screw 11 and the nut 12 are moving or stationary, the first stop block 141 is always spaced from the first sleeve 121, thereby avoiding friction between the first stop block 141 and the first sleeve 121. In this way, the first redundant gap can be smaller than the second redundant gap, so that the first redundant gap is greater than 0 and small enough to meet the design requirements, achieving the effect of further reducing the axial space occupied by the driving device 10.

[0047] Further, as shown in Figure 1As shown, the stop unit 14 further comprises a first elastic pad 143; the first elastic pad 143 is fixedly connected with the surface of the second stop block 142 which is perpendicular to the axis of the second sleeve 122; the size of the second stop block 142 along the axial direction of the screw rod 11 is greater than the size of the first accommodating ring groove 112 along the axial direction of the screw rod 11; in the state that the first stop block 141 abuts against the second stop block 142, the first elastic pad 143 is in a compressed state. In this way, the first stop block 141 can extrude the first elastic pad 143 to provide a buffer for the abutment of the first stop block 141 and the second stop block 142, so as to better protect the screw rod 11 and the nut 12. Before the first stop block 141 abuts against the second stop block 142, the first elastic pad 143 first abuts against the inner wall of the first accommodating ring groove 112 which is perpendicular to the axis of the screw rod 11. In this way, not only can a buffering effect be achieved, but also the limit position of the nut 12 relative to the screw rod 11 when the first stop block 141 and the second stop block 142 stop can be unaffected, so as to be conducive to accurately designing the size of the driving device 10 in the stop state, improve the reliability and accuracy of the stop unit 14, and further realize the compactness of the structure of the driving device 10.

[0048] Further, as shown in Figure 2 The driving device 10 comprises a pre-warning unit 15. The pre-warning unit 15 comprises a first reference part 151 and a second reference part 152; the first reference part 151 is arranged on the outer circumferential wall of the screw rod 11; the second reference part 152 is correspondingly arranged on the outer circumferential wall of the nut 12; in the state that the first stop block 141 abuts against the second stop block 142, the first reference part 151 and the second reference part 152 have a first spacing along the circumferential direction of the screw rod 11; the first spacing is greater than a threshold value. The threshold value is set according to actual needs, for example, the threshold value is 1 / 3 or 1 / 2 of the circumference of the outer circumference of the screw rod. That is, in the state that the first stop block 141 abuts against the second stop block 142, the first reference part 151 and the second reference part 152 have an easily observable first spacing, and when the first stop block 141 does not abut against the second stop block 142, the spacing between the first reference part 151 and the second reference part 152 is greater than the first spacing. Since the pre-warning unit 15 is arranged on the outer circumferential walls of the screw rod 11 and the nut 12, the spacing between the first reference part 151 and the second reference part 152 can be directly observed to determine whether the first stop block 141 and the second stop block 142 inside the driving device 10 abut against each other. The spacing of the first reference part 151 and the second reference part 152 is greater than the distance that the nut 12 and the screw rod 11 move relative to the axial direction. The limit size of the collision is more precise, and when the size of the former matches the size of the latter, the size of the former is greater, so as to realize the amplification of the size, and the damage of the stop unit 14 can be more clearly and directly determined.

[0049] Further, as shown in Figure 3As shown, the first reference part 151 comprises a reference block 1511. The reference block 1511 is fixedly connected with the screw rod 11; the end surface of the reference block 1511 facing the nut 12 is a first helical surface 1512; the axis of the first helical surface 1512 is coaxial with the screw rod 11; the reference block 1511 has a first reference surface 1513 thereon; the included angle between the first reference surface 1513 and the axis of the screw rod 11 is less than 10°; the first reference surface 1513 can be parallel to the axis of the screw rod 11, or the included angle between them can be 5° or 10°, etc. Therefore, the included angle between the first reference surface 1513 and the axis of the screw rod 11 is small, so that the distance between the first reference surface 1513 and the second reference part 152 along the circumferential direction of the screw rod 11 can be enlarged.

[0050] As shown in Figure 4 The second reference part 152 comprises a helical groove 1521. The helical groove 1521 is located at the end of the second sleeve 122 facing the reference block 1511; the helical groove 1521 has an adjacent second helical surface 1522 and a second reference surface 1523 therein; the axis of the second helical surface 1522 is coaxial with the nut 12; the included angle between the second reference surface 1523 and the axis of the nut 12 is less than 10°; the second reference surface 1523 can be parallel to the axis of the nut 12, or the included angle between them can be 5° or 10°, etc.

[0051] When the first stop block 141 abuts against the second stop block, the distance between the first reference surface 1513 and the second reference surface 1523 along the circumferential direction of the screw rod 11 is a first distance; the distance between the first helical surface 1512 and the second helical surface 1522 along the axial direction of the screw rod 11 is a second distance; the first distance is greater than the second distance.

[0052] The included angle between the first reference surface 1513 and the axis of the screw rod 11, and the included angle between the second reference surface 1523 and the axis of the nut 12 are both less than 10°, and the two angles are equal. If the first stop block 141 and the second stop block 142 have been damaged due to a violent collision, the screw rod 11 continues to rotate, so that the first reference surface 1513 and the second reference surface 1523 abut against each other, forcing the screw rod 11 to stop rotating, thereby protecting the screw rod 11 and the nut 12 mechanism. After the first reference surface 1513 and the second reference surface 1523 abut against each other, since both of them have an included angle with the axis of the driving device 10, a reaction force can be provided in the circumferential and axial directions of the driving device 10, further enhancing the stopping effect.

[0053] Since the linear speed on the outer circumferential surface of the lead screw 11 is much greater than the speed of the lead screw 11 moving in the axial direction when the lead screw 11 rotates, the first interval is set to be greater than the second interval, so that after the area where the first reference surface 1513 and the second reference surface 1523 are located is also damaged, the lead screw 11 can be slowed down through the friction between the first helical surface 1512 and the second helical surface 1522, and finally the lead screw 11 is stopped from rotating, avoiding further damage caused by the mechanical rotation of the lead screw 11.

[0054] Further, as shown in Figure 4 , the early warning unit 15 further includes a second elastic pad 1524; the second elastic pad 1524 is located between the first helical surface 1512 and the second helical surface 1522; the second elastic pad 1524 is fixedly connected with the second helical surface 1522. After the motor fails, the first helical surface 1512 can compress the second elastic pad 1524, providing a buffer for the abutment of the first helical surface 1512 and the second helical surface 1522, thereby minimizing the damage to the lead screw 11 and the nut 12. And the second elastic pad 1524 will not occupy the first interval in the early warning unit 15 for early warning of the damage of the stop unit 14, thereby ensuring the effective play of the early warning function of the first interval.

[0055] Further, as shown in Figure 1 , the drive device 10 further includes a transmission gear 16; the transmission gear 16 is fixedly connected with the lead screw 11. In this way, the transmission gear 16 can be integrated on the lead screw 11, simplifying the structure of the gear pair for transmitting the motor power, thereby reducing the space occupied by the drive device 10 and the gear pair, and further reducing the space occupied by the brake system in the vehicle.

[0056] Further, as shown in Figure 1 , the drive device 10 further includes a bearing 17; the inner ring of the bearing 17 is integrally formed with the lead screw 11, and the outer ring of the bearing 17 is fixedly connected with the vehicle frame. In this way, the inner and outer rings of the bearing 17 are arranged, so that the lead screw 11 can rotate around its own axis after being driven by the gear, thereby pushing the nut 12 to move linearly.

[0057] Embodiment Two:

[0058] The embodiment provides a brake system, which comprises the drive device 10 of any one of the embodiments one; the brake system further comprises a brake caliper support, a piston, and a brake block. The lead screw 11 of the drive device 10 is rotationally connected with the brake caliper support; the fixed seat 13 of the drive device 10 is fixedly connected with the brake caliper support; the piston is slidably connected with the brake caliper support; the nut 12 of the drive device 10 is fixedly connected with the piston; the piston is fixedly connected with the brake block; the brake system further comprises a brake disc, which is used to rotate with the vehicle wheel; the brake block abuts against the brake disc to realize braking.

[0059] Thus, after receiving the braking instruction, the motor drives the transmission gear 16, and then drives the screw rod 11 to rotate, and then drives the nut 12 to move along the axis of the nut 12 towards the piston, and then drives the piston, and then drives the brake block to move towards the brake disc rotating with the wheel, so as to brake the wheel.

[0060] Embodiment three:

[0061] The embodiment provides a vehicle, the vehicle comprising the brake system in the embodiment two, and further comprising a vehicle body and a wheel. The wheel is rotationally connected with the vehicle body; the brake disc of the brake system is fixedly connected with the wheel; and the brake caliper support is fixedly connected with the vehicle body. Thus, after receiving the braking instruction, the motor drives the transmission gear 16, and then drives the screw rod 11 to rotate, and then drives the nut 12 to move along the axis of the nut 12 towards the piston, and then drives the piston, and then drives the brake block to move towards the brake disc rotating with the wheel, so as to brake the wheel.

[0062] Those skilled in the art can understand that the above-mentioned embodiments are specific cases for realizing the present disclosure, and in actual application, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A driving device, characterized in that, The driving device includes: A lead screw, wherein the lead screw has a weight-reducing shaft hole; the weight-reducing shaft hole extends through both ends of the lead screw along its axial direction; The lead screw nut includes a first sleeve and a second sleeve; the first sleeve and the second sleeve are detachably connected; the second sleeve is helically connected to the lead screw; the two ends of the second sleeve are axially connected; the end of the first sleeve near the second sleeve is open; the end of the first sleeve away from the second sleeve is closed; the outer end face of the first sleeve away from the second sleeve is a mounting surface. A fixed base is provided, wherein the lead screw and the fixed base are slidably connected along the axial direction of the lead screw; the lead screw and the fixed base are capable of relative rotation. A stop unit, comprising a first stop block and a second stop block; a first receiving annular groove is formed at the end of the lead screw facing the first sleeve; the first receiving annular groove extends to the weight-reducing shaft hole; the first stop block is fixedly connected to the lead screw; the first stop block is located in the first receiving annular groove; the second stop block is fixedly connected to the inner wall of the first sleeve; the first stop block and the second stop block are respectively equidistant from the axis of the lead screw; The warning unit includes a first reference part and a second reference part; the first reference part is disposed on the outer peripheral wall of the lead screw; the second reference part is disposed on the lead nut; when the first stop block and the second stop block are in contact, there is a first distance between the first reference part and the second reference part along the circumferential direction of the lead screw; the first distance is greater than a threshold.

2. The driving device according to claim 1, characterized in that, There is a gap between the end face of the lead screw facing the first sleeve and the first stop block.

3. The driving device according to claim 2, characterized in that, The stop unit further includes a first elastic pad; the first elastic pad is fixedly connected to the surface of the second stop block perpendicular to the axis of the second sleeve; the dimension of the second stop block along the axial direction of the lead screw is greater than the dimension of the first receiving annular groove along the axial direction of the lead screw; when the first stop block abuts against the second stop block, the first elastic pad is in a compressed state.

4. A driving device according to claim 1, characterized in that, The first reference part includes a reference block; the reference block is fixedly connected to the lead screw; the end face of the reference block facing the lead screw nut is a first helical surface; the axis of the first helical surface is coaxial with the lead screw; the reference block has a first reference surface; the angle between the first reference surface and the axis of the lead screw is less than 10°; The second reference portion includes a spiral groove; the spiral groove is located at the end of the second sleeve facing the reference block; the spiral groove has adjacent second spiral surfaces and second reference surfaces; the axis of the second spiral surface is coaxial with the nut; the angle between the second reference surface and the axis of the nut is less than 10°; When the first stop block and the second stop block are in contact, the distance between the first reference surface and the second reference surface along the circumferential direction of the lead screw is the first spacing; the distance between the first helical surface and the second helical surface along the axial direction of the lead screw is the second spacing; the first spacing is greater than the second spacing.

5. A driving device according to claim 4, characterized in that, The warning unit further includes a second elastic pad; the second elastic pad is located between the first spiral surface and the second spiral surface; the second elastic pad is fixedly connected to the second spiral surface.

6. A driving device according to claim 1, characterized in that, The drive device also includes a transmission gear; the transmission gear is fixedly connected to the lead screw.

7. A driving device according to claim 1, characterized in that, The drive device also includes a bearing; the inner ring of the bearing is integrally formed with the lead screw.

8. A braking system, characterized in that, The braking system includes the drive device according to any one of claims 1-7; A brake caliper bracket is provided, wherein the lead screw of the drive device is rotatably connected to the brake caliper bracket; and the fixed base of the drive device is fixedly connected to the brake caliper bracket. A piston is slidably connected to the brake caliper bracket; a nut of the drive device is fixedly connected to the piston. Brake block, the piston is fixedly connected to the brake block; A brake disc, which rotates with the wheel; and a brake block abutting against the brake disc to achieve braking.

9. A vehicle, characterized in that, The vehicles include: Body; Wheels, which are rotatably connected to the vehicle body; The braking system as described in claim 8, wherein the brake disc of the braking system is fixedly connected to the wheel; and the brake caliper bracket is fixedly connected to the vehicle body.

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