Braking device and vehicle

Abstract

This invention discloses a braking device, comprising: a first motor, including a motor housing; a planetary gear transmission assembly, including a sun gear, multiple planet gears, an internal gear ring, a lower planetary carrier, and an upper planetary carrier disposed outside the motor housing, wherein the rotation and revolution of the planet gears can drive the upper and lower planetary carriers to rotate; a second-stage driven gear, capable of rotating under the drive of the upper planetary carrier; a third-stage driving gear, capable of rotating together with the second-stage driven gear; a third-stage driven gear, capable of rotating under the drive of the third-stage driving gear; and a ball screw assembly, capable of converting the rotational motion transmitted from the third-stage driven gear into linear motion, thereby pushing the friction pads to clamp or move away from the brake disc, so that the brake is in a clamped or released state. The braking device according to this application can shorten the axial dimension, facilitate the installation of pressure sensors, and reduce the need for a first motor, thus reducing costs. This invention also discloses a vehicle.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and in particular to a braking device and a vehicle. Background Technology

[0002] Traditional hydraulic braking uses the brake pedal to control the vehicle's master cylinder, which in turn delivers brake fluid through hydraulic lines to the brake calipers at each wheel. These calipers then push the friction pads to apply brakes. While hydraulic braking can meet the vehicle's braking needs, it suffers from problems such as slow response, oil leaks, easy contamination, large space requirements, and low energy density. Furthermore, it cannot meet the demands of future vehicle electrification, intelligentization, and advanced autonomous driving.

[0003] While electromechanical braking devices exist on the market, most of them place the planetary gear transmission assembly at the output end of the gear train. This makes it impossible to reduce the axial dimension, resulting in an overall larger size of the device and making it difficult to install. Furthermore, the larger gear size also causes problems with the wiring of the pressure sensor. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that the axial dimension cannot be reduced, resulting in an oversized device that is difficult to arrange.

[0005] In a first aspect, the present invention provides a braking device, comprising: a first motor, including a motor housing; a planetary gear transmission assembly, including a sun gear, a plurality of planet gears, an internal gear ring, a lower planetary carrier, and an upper planetary carrier disposed outside the motor housing, wherein the sun gear is fixed to the first motor shaft of the first motor and can rotate together with the first motor shaft, each planet gear meshes with the sun gear and the internal gear ring, so that the planet gear can revolve around the sun gear and rotate on its own axis under the drive of the sun gear, and the rotation and revolution of the planet gear can drive the upper planetary carrier and the lower planetary carrier to rotate; a second-stage driven gear, which can rotate under the drive of the upper planetary carrier; a third-stage driving gear, which can rotate together with the second-stage driven gear; a third-stage driven gear, which can rotate under the drive of the third-stage driving gear; and a ball screw assembly, which can convert the rotational motion transmitted from the third-stage driven gear into linear motion, thereby pushing the friction pads to clamp or move away from the brake disc, so that the brake is in a clamped state or a released state.

[0006] According to the braking device of this application, since the first motor directly drives the planetary gear transmission assembly, the sun gear, multiple planet gears, internal gear ring, and lower planetary carrier in the planetary gear transmission assembly can be housed within the motor housing. This shortens the axial dimension and facilitates the arrangement of components (such as pressure sensors). Furthermore, the combination of a high-power-density planetary gear transmission assembly and a two-stage gear transmission increases the transmission ratio of the entire transmission system, thereby reducing the need for the first motor and lowering costs. Simultaneously, the three-stage transmission configuration reduces the size of the final three-stage driven gear in the gear system, which is beneficial for the placement of the pressure sensor. For example, it allows for connection to the PCB via a connector, unlike existing technologies that rely on flying wires or spring pins, which are not feasible for mass production and pose a risk of signal interruption under vibration.

[0007] In some embodiments, the motor housing is provided with an end cap at one end near the upper planetary carrier along the first axial direction. The end cap includes an internal gear ring and a first insert disposed on the internal gear ring. The internal gear ring is made of plastic material, and the first insert and the motor housing are both made of aluminum alloy material. The end cap is fixed to the motor housing by laser welding through the first insert.

[0008] In some embodiments, the system further includes: a lower PCB housing for accommodating the PCB, the lower PCB housing being disposed on a side away from the first motor along a first axial direction, the lower PCB housing extending in a radial direction and having a first stop portion extending along the first axial direction, the first stop portion being used to stop the planetary gear transmission assembly from moving in the first axial direction.

[0009] In some embodiments, the upper planetary carrier includes a secondary driving gear, and a secondary driven gear is disposed radially above the secondary driving gear and meshes with the secondary driving gear.

[0010] In some embodiments, a bushing is fixed on the first stop portion, and a protrusion extending along the first axial direction is provided on the secondary drive gear. The centering of the secondary drive gear is achieved by fixing the protrusion to the bushing.

[0011] In some embodiments, the system further includes: a gear housing and a fixed shaft, wherein the gear housing is used to accommodate a second-stage driving gear, a second-stage driven gear, a third-stage driving gear, and a third-stage driven gear, and the fixed shaft is fixed to the gear housing and arranged parallel to the first motor shaft.

[0012] In some embodiments, the secondary driven gear and the tertiary driving gear are coaxially arranged on a fixed shaft, and the secondary driven gear and the tertiary driving gear are integrally injection molded by inserts. The tertiary driven gear is arranged radially above the tertiary driving gear and meshes with the tertiary driving gear.

[0013] In some embodiments, the device further includes: a first ball bearing, wherein the inner ring of the first ball bearing is provided with a clearance from the fixed shaft, and the outer ring of the first ball bearing is interference-fitted with the secondary driven gear.

[0014] In some embodiments, the lower housing of the PCB is provided with a second stop portion extending along the first axial direction, and the first ball bearing is spaced apart from the second stop portion. The second stop portion is used to stop the first ball bearing, the second driven gear and the third driving gear from moving in the first axial direction.

[0015] In some embodiments, the portion of the fixed shaft extending beyond the first ball bearing along the first axial direction is radially spaced between the second stops to provide support when the fixed shaft deflects.

[0016] In some embodiments, the third-stage driven gear is heat-welded to the end face of the gear housing via a second ball bearing to prevent the third-stage driven gear from moving in the first axial direction.

[0017] In some embodiments, the upper planetary carrier also includes a ratchet, a secondary drive gear, and the ratchet integrally formed.

[0018] In some embodiments, the system further includes: a parking motor assembly disposed within the gear housing in a direction perpendicular to the first axial direction, the parking motor assembly being equipped with a pawl, and parking is achieved by the engagement of the pawl and the ratchet.

[0019] In some embodiments, the parking motor assembly includes a parking motor, a screw fixed to a second motor shaft of the parking motor, a first nut adapted to the screw, and a sliding sleeve sleeved on the first nut. The sliding sleeve is used to assemble a ratchet pawl, and a ratchet pawl shaft is injection molded into an insert on the gear housing. The ratchet pawl is rotatable around the ratchet pawl shaft.

[0020] In some embodiments, the parking motor assembly further includes a retaining ring and an elastic member. The first nut is sequentially fitted with a sliding sleeve, an elastic member, and a retaining ring in the direction of the second axial direction toward the parking motor. The elastic member is capable of elastic deformation under the limitation of the sliding sleeve and the retaining ring.

[0021] In some embodiments, the parking motor assembly further includes a washer fitted onto the end of the first nut away from the parking motor in a second axial direction.

[0022] In some embodiments, when the parking motor rotates forward, the first nut moves towards the ratchet along the second axial direction, and the pawl rotates clockwise to engage with the teeth of the ratchet, thus parking the vehicle; when the parking motor rotates in reverse, the first nut moves away from the ratchet along the second axial direction, and the pawl rotates counterclockwise to release from the teeth of the ratchet, thus releasing the vehicle from parking.

[0023] In some embodiments, the gear housing is provided with a first connector, through which the pressure sensor can be connected to the PCB, and / or, the gear housing is provided with a second connector, through which the parking motor can be connected to the PCB.

[0024] In some embodiments, the upper planetary carrier and the lower planetary carrier are fixed by planetary pins, wherein one end of the planetary pin is interference-fitted with the upper planetary carrier and the other end of the planetary pin is riveted to the lower planetary carrier.

[0025] Secondly, the present invention also provides a vehicle including any of the braking devices described in the above embodiments. Attached Figure Description

[0026] Figure 1 A schematic diagram of a braking device according to an embodiment of the present invention is shown;

[0027] Figure 2 Show Figure 1 Cross-sectional view of region A in the middle;

[0028] Figure 3 A schematic diagram of the gear train housing according to an embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram of hot melt welding according to an embodiment of the present invention is shown;

[0030] Figure 5 An exploded view of the parking motor assembly according to an embodiment of the present invention is shown;

[0031] Figure 6A This diagram illustrates the parking motor assembly, pawl, and ratchet in the parking state according to an embodiment of the present invention.

[0032] Figure 6B This diagram illustrates the parking motor assembly, pawl, and ratchet in the released parking state according to an embodiment of the present invention. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0034] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] refer to Figures 1 to 3 This application provides a braking device, including: a first motor 01, a planetary gear transmission assembly, a second-stage driven gear 10, a third-stage driving gear 12, a third-stage driven gear 13, and a ball screw assembly 16. The first motor 01 includes a motor housing and is used to provide power to the braking device. In some embodiments, the first motor 01 may be a permanent magnet synchronous motor, which is not specifically limited herein.

[0040] The planetary gear transmission assembly includes a sun gear (not shown) disposed within the motor housing, a plurality of planet gears 27, an internal ring gear 25, a lower planet carrier 24, and an upper planet carrier 35 disposed outside the motor housing. The sun gear is fixed to the first motor shaft 04 of the first motor 01 and can rotate with the first motor shaft 04. Each planet gear 27 meshes with the sun gear and the internal ring gear 25, so that the planet gear 27 can revolve around the sun gear while rotating on its own axis under the drive of the sun gear. The rotation and revolution of the planet gears 27 can drive the upper planet carrier 35 and the lower planet carrier 24 to rotate. In some embodiments, the upper planet carrier 35 and the lower planet carrier 24 are fixed by planetary pins 26. Exemplarily, one end of the planetary pin 26 is interference-fitted with the upper planet carrier 35, and the other end of the planetary pin 26 is riveted to the lower planet carrier 24.

[0041] The secondary driven gear 10 can rotate under the drive of the upper planetary carrier 35, the tertiary driving gear 12 can rotate together with the secondary driven gear 10, and the tertiary driven gear 13 can rotate under the drive of the tertiary driving gear 12. The ball screw assembly 16 can convert the rotational motion transmitted by the tertiary driven gear 13 into linear motion, thereby pushing the friction plate 17 to clamp or move away from the brake disc, so that the brake is in a clamped or released state.

[0042] In other words, when the first motor 01 is in operation, the first motor shaft 04 drives the sun gear to rotate together, and the planet gears 27 revolve around the sun gear under the drive of the sun gear. At the same time, the planet gears 27 rotate on their own axis under the constraint of the internal gear ring 25. The rotation and revolution of the planet gears 27 can be transmitted to the planet carrier (including the upper planet carrier 35 and the lower planet carrier 24) through, for example, the planet pin 26, so that the planet carrier rotates. The second-stage driven gear 10 rotates under the drive of the upper planet carrier 35, the third-stage driving gear 12 rotates together with the second-stage driven gear 10, and the third-stage driven gear 13 rotates under the drive of the third-stage driving gear 12. This rotation is transmitted to the ball screw assembly 16, for example, through a spline, so that the ball screw assembly 16 converts the transmitted rotational motion into linear motion, thereby pushing the friction plate 17 to clamp or move away from the brake disc, so that the brake is in a clamped or released state.

[0043] According to the braking device of this application, since the first motor 01 directly drives the planetary gear transmission assembly, the sun gear, multiple planet gears 27, internal gear ring 25, and lower planet carrier 24 in the planetary gear transmission assembly can be housed within the motor housing. This shortens the axial dimension and facilitates the arrangement of components (e.g., pressure sensor 15). Furthermore, the combination of a high-power-density planetary gear transmission assembly and a two-stage gear transmission increases the transmission ratio of the entire transmission system, thereby reducing the demand for the first motor 01 and lowering costs. Simultaneously, the three-stage transmission configuration reduces the size of the final three-stage driven gear 13 of the gear system, which is beneficial for the placement of the pressure sensor 15. For example, it can be connected to the PCB via a connector, unlike the prior art which only allows for the use of flying wires or spring pins, which are not feasible for mass production, and spring pins pose a risk of signal interruption under vibration.

[0044] In some embodiments, reference Figure 1 and Figure 2 An end cap 02 is provided at one end of the motor housing near the upper planetary carrier 35 along the first axial direction X1. The end cap 02 includes an internal gear ring 25 and a first insert 28 disposed on the internal gear ring 25. The internal gear ring 25 is made of plastic, while the first insert 28 and the motor housing are both made of aluminum alloy. The end cap 02 is fixed to the motor housing by the first insert 28. Exemplarily, the first insert 28 is fixed to the motor housing by laser welding, thereby achieving the fixation of the end cap 02 to the motor housing. In some embodiments, the end cap 02 can be injection molded from electro-corrosion resistant plastic particles, thereby improving the electrical spark and noise problems of the motor.

[0045] In some embodiments, reference Figure 1 The braking device further includes a PCB lower housing 08 for accommodating the PCB. The PCB lower housing 08 is disposed on the side away from the first motor 01 along the first axial direction X1. The PCB lower housing 08 extends in the radial direction Y and is provided with a first stop portion 081 extending along the first axial direction X1, the first stop portion 081 being used to stop the planetary gear transmission assembly from moving in the first axial direction X1.

[0046] In some embodiments, the upper planetary carrier 35 includes a secondary driving gear 05, and a secondary driven gear 10 is disposed above the secondary driving gear 05 along the radial direction Y and meshes with the secondary driving gear 05. In other words, the secondary driving gear 05 can drive the secondary driven gear 10 to rotate through meshing. In some embodiments, the secondary driving gear 05 is provided with a protrusion 051 extending along the first axial direction X1, and a bushing 07 (e.g., a copper bushing 07) is fixed on the first stop portion 081. The centering of the secondary driving gear 05 is achieved by supporting and fixing the protrusion 051 and the bushing 07.

[0047] In some embodiments, the braking device further includes a magnetic ring 06 for monitoring the position signal of the first motor 01. For example, refer to... Figure 2 The magnetic ring 06 is fixed to the inner hole of the first motor shaft 04 by glue.

[0048] In some embodiments, reference Figure 2 and Figure 3 The braking device further includes a gear housing 19 and a fixed shaft 09. The gear housing 19 accommodates a second-stage driving gear 05, a second-stage driven gear 10, a third-stage driving gear 12, and a third-stage driven gear 13. The fixed shaft 09 is fixed to the gear housing 19 and is arranged parallel to the first motor shaft 04. In this embodiment, the fixed shaft 09 and the gear housing 19 are integrally injection molded. In some embodiments, reference... Figure 1 The secondary driven gear 10 and the tertiary driving gear 12 are coaxially mounted on the fixed shaft 09, and the secondary driven gear 10 and the tertiary driving gear 12 are integrally molded by insert injection molding.

[0049] In some embodiments, the braking device further includes a first ball bearing 11. The inner ring of the first ball bearing 11 is provided with a clearance from the fixed shaft 09, and the outer ring of the first ball bearing 11 is interference-fitted with the secondary driven gear 10, so that the secondary driven gear 10 and the tertiary driving gear 12 can rotate around the fixed shaft 09.

[0050] In some embodiments, the lower housing 08 of the PCB is provided with a second stop portion 082 extending along the first axial direction X1. The first ball bearing 11 is spaced apart from the second stop portion 082, and the second stop portion 082 is used to stop the first ball bearing 11, the secondary driven gear 10, and the tertiary driving gear 12 from moving along the first axial direction X1. In some embodiments, the portion of the fixed shaft 09 extending beyond the first ball bearing 11 along the first axial direction X1 is spaced apart along the radial direction Y between the second stop portions 082, so that the second stop portion 082 can provide support when the fixed shaft 09 deflects, thereby ensuring small shaft deflection and facilitating smooth transmission.

[0051] In some embodiments, reference Figure 1 and Figure 4 The third-stage driven gear 13 is positioned above and meshes with the third-stage driving gear 12 along the radial direction Y. In other words, the third-stage driving gear 12 can drive the third-stage driven gear 13 to rotate through meshing. The third-stage driven gear 13 is heat-welded to the end face of the gear housing 19 via a second ball bearing 14 to prevent the third-stage driven gear 13 from moving in the first axial direction X1.

[0052] In some embodiments, reference Figure 1A caliper housing 18 is provided on the side of the third-stage driven gear 13 near the first motor 01 along the first axial direction X1. The caliper housing 18 has a cavity that can accommodate and support the ball screw assembly 16. The third-stage driven gear 13 and the ball screw assembly 16 are connected by internal and external splines to transmit the rotation of the third-stage driven gear 13 to the ball screw assembly 16. Exemplarily, the rotation of the third-stage driven gear 13 can cause the ball screw assembly 16 to drive the second nut (not shown) to move along the first axial direction X1, thereby pushing the friction plate 17 to clamp or move away from the brake disc, so that the brake is in a clamped or released state. The internal and external spline connection can ensure precise transmission between the ball screw and the second nut.

[0053] In some embodiments, the pressure sensor 15 is disposed between the shaft (not shown) of the ball screw assembly 16 and the end face of the caliper housing 18. Reference Figure 3 The gear housing 19 is provided with a first connector 20, through which the pressure sensor 15 can be connected to the PCB. In this application, the pressure sensor 15 is connected to the PCB via a connector, which facilitates connection and better meets the requirements for mass production feasibility.

[0054] In some embodiments, reference Figure 3 The braking device also includes a parking motor assembly 22, which is disposed within the gear housing 19 in a direction perpendicular to the first axial direction X1. In other words, the parking motor assembly 22 can be transversely disposed within the gear housing 19. Compared to the traditional arrangement parallel to the first motor shaft 04, the structure is more compact, so that the parking motor assembly 22 is no longer a bottleneck in the axial dimension arrangement of the braking device, and the axial dimension is shortened to a large extent.

[0055] In some embodiments, reference Figure 1 and Figure 2 The upper planetary carrier 35 also includes a ratchet 03, a secondary drive gear 05, and the ratchet 03, all integrally formed. (Reference) Figure 6A and Figure 6B The parking motor assembly 22 is equipped with a pawl 23, which cooperates with the ratchet 03 to achieve parking.

[0056] In some embodiments, reference Figure 5 The parking motor assembly 22 includes a parking motor 29, a screw 30 fixed to a second motor shaft of the parking motor 29, a first nut 34 adapted to the screw 30, and a sliding sleeve 33 sleeved on the first nut 34. Exemplarily, the screw 30 is press-fitted onto the second motor shaft. The sliding sleeve 33 is used to assemble a pawl 23. Exemplarily, the sliding sleeve 33 has a groove 331, and one end of the pawl 23 can be loosely installed in the groove 331 of the sliding sleeve 33 and movably connected to the groove 331. (Reference) Figure 4The gear housing 19 has a ratchet shaft 36 inserted by injection molding, and the ratchet 23 can rotate around the ratchet shaft 36.

[0057] In some embodiments, reference Figure 5 The parking motor assembly 22 also includes a retaining ring 31 and an elastic component 32. A sliding sleeve 33, an elastic component 32, and a retaining ring 31 are sequentially fitted onto the first nut 34 along the second axial direction X2 towards the parking motor 29. The elastic component 32 can elastically deform under the constraint of the sliding sleeve 33 and the retaining ring 31 to adjust the displacement of the pawl 23 in the second axial direction X2, allowing the pawl 23 to more easily engage with the teeth of the ratchet 03.

[0058] In this embodiment, the retaining ring 31 is interference-fitted with the first nut 34 and is located at the end of the first nut 34 along the second axial direction X2 near the parking motor 29. An axial limiting portion is provided at the other end of the first nut 34 along the second axial direction X2 away from the parking motor 29. When the sliding sleeve 33 abuts against the axial limiting portion on the first nut 34, the elastic member 32 is in a non-adjusting state. When the sliding sleeve 33 does not abut against the axial limiting portion on the first nut 34, the elastic member 32 is in an adjusting state. The sliding sleeve 33 drives the pawl 23 to move relative to the first nut 34, thereby adjusting the displacement of the pawl 23 in the second axial direction X2, allowing the pawl 23 to more smoothly engage in the backlash of the ratchet 03. In this embodiment, the elastic member 32 is a counter-spring, which is not specifically limited here, as long as it can adjust the displacement in the second axial direction X2.

[0059] In some embodiments, reference Figure 5 The parking motor assembly 22 also includes a washer 35, which is sleeved on the end of the first nut 34 away from the parking motor 29 along the second axial direction X2. Exemplarily, the washer 35 can be a D-type washer 35. The washer 35 prevents the first nut 34 from easily jamming when moving away from the parking motor 29 along the second axial direction X2, thus reducing parking noise. In some embodiments, reference... Figure 6A and Figure 6B The screw 30 is provided with a third stop 301, which can prevent the first nut 34 from jamming when it moves in the direction of the second axial direction X2 toward the parking motor 29, thus reducing parking noise. This setting can solve the problems of the transmission electromagnet being prone to jamming under radial force and the high noise of operation. It also has lower requirements for electronic components on the PCB, simpler control, and lower cost.

[0060] The working principle of this application for parking and releasing the vehicle is as follows: (Refer to...) Figure 6AWhen the parking motor 29 rotates forward, the first nut 34 moves along the second axial direction X2 towards the ratchet 03, and the pawl 23 rotates clockwise (as shown by the arrow in the figure) to engage with the teeth of the ratchet 03, thus achieving parking; (Reference) Figure 6B When the parking motor 29 reverses, the first nut 34 moves away from the ratchet 03 along the second axial direction X2, and the pawl 23 rotates counterclockwise (as shown by the arrow in the figure) to release from the back of the ratchet 03, thus releasing the parking brake.

[0061] The parking mechanism of this application effectively controls the engagement and disengagement of the ratchet 03 and pawl 23 via the parking motor 29, thereby effectively locking the transmission system. It achieves rapid switching between parking and driving states without requiring a separate motor and gear unit like traditional parking systems. Furthermore, compared to commercially available solutions that use electromagnets to assist parking, this application effectively solves the noise problem associated with electromagnets, reduces the risk of parking function failure due to electromagnet jamming under radial force, and improves performance stability under low-temperature conditions.

[0062] In some embodiments, reference Figure 3 The gear housing 19 is equipped with a second connector 21, through which the parking motor 29 can be connected to the PCB. Connecting the parking motor 29 to the PCB via a connector facilitates connection and better meets the requirements for mass production feasibility.

[0063] This application also provides a vehicle including any of the braking devices described in the above embodiments.

[0064] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A braking device, characterized in that, include: The first motor includes a motor housing; The planetary gear transmission assembly includes a sun gear, multiple planet gears, an internal gear ring, a lower planet carrier, and an upper planet carrier disposed outside the motor housing. The sun gear is fixed to the first motor shaft of the first motor and can rotate with the first motor shaft. Each planet gear meshes with the sun gear and the internal gear ring, so that the planet gear can revolve around the sun gear and rotate on its own axis under the drive of the sun gear. The rotation and revolution of the planet gear can drive the upper planet carrier and the lower planet carrier to rotate. The secondary driven gear is capable of rotating under the drive of the upper planet carrier; The third-stage driving gear can rotate together with the second-stage driven gear; The third-stage driven gear can rotate under the drive of the third-stage driving gear; The ball screw assembly can convert the rotational motion transmitted from the three-stage driven gear into linear motion, thereby pushing the friction plate to clamp or move away from the brake disc, so that the brake is in a clamped or released state.

2. The braking device as described in claim 1, characterized in that, The motor housing has an end cap at one end near the upper planetary carrier along the first axial direction. The end cap includes the internal gear ring and a first insert disposed on the internal gear ring. The internal gear ring is made of plastic, and the first insert and the motor housing are both made of aluminum alloy. The end cap is laser welded to the motor housing through the first insert.

3. The braking device as described in claim 2, characterized in that, Also includes: A PCB lower housing for accommodating a PCB is disposed on a side away from the first motor along the first axial direction. The PCB lower housing extends radially and is provided with a first stop portion extending along the first axial direction. The first stop portion is used to stop the planetary gear transmission assembly from moving in the first axial direction.

4. The braking device as described in claim 3, characterized in that, The upper planetary carrier includes a secondary driving gear, and the secondary driven gear is disposed above the secondary driving gear along the radial direction and meshes with the secondary driving gear.

5. The braking device as described in claim 4, characterized in that, A bushing is fixed on the first stop portion, and a protrusion extending along the first axial direction is provided on the secondary drive gear. The protrusion is supported and fixed by the bushing to achieve the centering of the secondary drive gear.

6. The braking device as described in claim 4, characterized in that, Also includes: The gear train housing and the fixed shaft are provided. The gear train housing is used to accommodate the second-stage driving gear, the second-stage driven gear, the third-stage driving gear, and the third-stage driven gear. The fixed shaft is fixed to the gear train housing and is arranged parallel to the first motor shaft.

7. The braking device as described in claim 6, characterized in that, The secondary driven gear and the tertiary driving gear are coaxially mounted on the fixed shaft, and the secondary driven gear and the tertiary driving gear are integrally molded by insert injection molding. The tertiary driven gear is positioned above the tertiary driving gear along the radial direction and meshes with the tertiary driving gear.

8. The braking device as described in claim 6, characterized in that, Also includes: The first ball bearing has an inner ring that is clearance-set with the fixed shaft, and the outer ring of the first ball bearing is interference-fitted with the secondary driven gear.

9. The braking device as claimed in claim 8, characterized in that, The lower housing of the PCB is provided with a second stop portion extending along the first axial direction. The first ball bearing and the second stop portion are spaced apart. The second stop portion is used to stop the first ball bearing, the second driven gear and the third driving gear from moving in the first axial direction.

10. The braking device as claimed in claim 9, characterized in that, The portion of the fixed shaft extending beyond the first ball bearing along the first axial direction is spaced apart between the second stops along the radial direction to provide support when the fixed shaft deflects.

11. The braking device as claimed in claim 6, characterized in that, The third-stage driven gear is heat-welded to the end face of the gear housing via a second ball bearing to prevent the third-stage driven gear from moving in the first axial direction.

12. The braking device as claimed in claim 6, characterized in that, The upper planetary carrier also includes a ratchet, and the secondary drive gear and the ratchet are integrally formed.

13. The braking device as claimed in claim 12, characterized in that, Also includes: A parking motor assembly is disposed within the gear train housing in a direction perpendicular to the first axial direction. The parking motor assembly is equipped with a pawl, and parking is achieved through the engagement of the pawl and the ratchet.

14. The braking device as claimed in claim 13, characterized in that, The parking motor assembly includes a parking motor, a screw fixed to a second motor shaft of the parking motor, a first nut adapted to the screw, and a sliding sleeve sleeved on the first nut. The sliding sleeve is used to assemble the pawl. The gear housing has a pawl shaft inserted and injection molded on it, and the pawl can rotate around the pawl shaft.

15. The braking device as claimed in claim 14, characterized in that, The parking motor assembly further includes a retaining ring and an elastic component. The first nut is sequentially fitted with the sliding sleeve, the elastic component and the retaining ring along the second axial direction toward the parking motor. The elastic component can undergo elastic deformation under the limitation of the sliding sleeve and the retaining ring.

16. The braking device as claimed in claim 14, characterized in that, The parking motor assembly also includes a washer, which is sleeved on the end of the first nut away from the parking motor along the second axial direction.

17. The braking device as claimed in claim 14, characterized in that, When the parking motor rotates forward, the first nut moves towards the ratchet along the second axial direction, and the pawl rotates clockwise to engage with the teeth of the ratchet, thus parking the vehicle. When the parking motor rotates in reverse, the first nut moves away from the ratchet along the second axial direction, and the pawl rotates counterclockwise to release from the teeth of the ratchet, thus releasing the vehicle from parking.

18. The braking device as claimed in claim 6, characterized in that, The gear housing is provided with a first connector, through which the pressure sensor can be connected to the PCB, and / or, the gear housing is provided with a second connector, through which the parking motor can be connected to the PCB.

19. The braking device as claimed in claim 1, characterized in that, The upper planetary carrier and the lower planetary carrier are fixed together by planetary pins, wherein one end of the planetary pin is interference-fitted with the upper planetary carrier and the other end of the planetary pin is riveted to the lower planetary carrier.

20. A vehicle, characterized in that, Includes the braking device as described in any one of claims 1 to 19.

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