Brake device and vehicle

Abstract

The utility model discloses a brake device, which comprises a first motor, a second motor and a brake device, the planet wheel transmission assembly comprises a sun wheel, a plurality of planet wheels, an inner gear ring, a lower planet carrier and an upper planet carrier, the sun wheel, the planet wheels, the inner gear ring and the lower planet carrier are arranged in the motor shell, the upper planet carrier is arranged outside the motor shell, and rotation and revolution of the planet wheels can drive the upper planet carrier and the lower planet carrier to rotate; the secondary driven gear can rotate under the driving of the upper planet carrier; the third-stage driving gear can rotate along with the second-stage driven gear; the third-stage driven gear can rotate under the driving of the third-stage driving gear; and the ball screw assembly can convert the rotary motion transmitted by the three-stage driven gear into linear motion, and then the friction plate is pushed to clamp or be away from the brake disc, so that the brake is in a clamping state or a releasing state. According to the braking device, the axial size can be shortened, arrangement of the pressure sensor is facilitated, the requirement for the first motor is reduced, and cost is reduced. The utility model further discloses a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to brake technology field, especially a kind of brake device and vehicle. BACKGROUND

[0002] Traditional hydraulic braking is controlled by brake pedal to control the hydraulic pump of vehicle, and then brake fluid is transmitted to brake pump of each wheel through hydraulic pipeline, and then each pump pushes friction plate to brake. Although hydraulic braking can meet the needs of vehicle braking, it has slow response, oil leakage, easy pollution, large space occupation and low energy density, and cannot meet the needs of future automobile electrification, intelligentization and high-level automatic driving.

[0003] Although there are electronic mechanical brake devices on the market, most of them set planetary gear transmission assembly at the output end of gear train, which cannot save axial size, resulting in the size of the whole device being too large and difficult to arrange. Moreover, the large size of the gear will also cause the wiring of the pressure sensor to be a problem. SUMMARY

[0004] The utility model aims at solving the technical problem that axial size cannot be saved, resulting in the size of the whole device being too large and difficult to arrange.

[0005] In the first aspect, the utility model provides a kind of brake device, comprising: first motor, including motor shell;Planetary gear transmission assembly, including the sun gear being set in motor shell, multiple planetary gears, inner toothed ring, lower planet carrier and the upper planet carrier being set outside motor shell, wherein, sun gear is fixed on the first motor shaft of first motor and can rotate with the first motor shaft, each planetary gear is engaged with sun gear and inner toothed ring, so that planetary gear can revolve around sun gear while rotating under the drive of sun gear, the rotation and revolution of planetary gear can drive upper planet carrier and lower planet carrier to rotate;Second level driven gear, can rotate under the drive of upper planet carrier;Third level driving gear, can rotate with second level driven gear;Third level driven gear, can rotate under the drive of third level driving gear;Ball screw assembly, can convert the rotary motion transmitted by third level driven gear into linear motion, and then push friction plate to clamp or away from brake disc, so that brake device is in clamping state or release state.

[0006] According to the brake device, the sun gear, the plurality of planet gears, the ring gear and the lower planet carrier in the planetary gear assembly are arranged in the motor housing, so that the axial dimension can be shortened, and the arrangement of components (for example, a pressure sensor) is facilitated. In addition, the combination of the planetary gear assembly with high power density and the two-stage gear transmission can improve the transmission ratio of the entire transmission system, thereby reducing the demand for the first motor and reducing the cost. At the same time, the arrangement of the three-stage transmission can reduce the size of the three-stage driven gear at the end of the gear train, which is beneficial to the arrangement of the pressure sensor. For example, the pressure sensor can be connected to the PCB in the form of a connector, without the need for a flying wire or a pogo pin as in the prior art, which does not have mass production feasibility and has the risk of signal instantaneous interruption under vibration.

[0007] In some embodiments, the motor housing is provided with an end cover at one end close to the upper planet carrier along the first axial direction, the end cover comprises a ring gear and a first insert arranged on the ring gear, the ring gear is made of plastic material, and the first insert and the motor housing are made of aluminum alloy material. The end cover is fixed by laser welding with the motor housing through the first insert.

[0008] In some embodiments, further comprising: a PCB lower housing for accommodating a PCB, the PCB lower housing is arranged on the side away from the first motor along the first axial direction, the PCB lower housing extends along the radial direction and is provided with a first stop portion extending along the first axial direction, and the first stop portion is used to stop the planet gear assembly from moving in the first axial direction.

[0009] In some embodiments, the upper planet carrier comprises a second primary gear, and the second driven gear is arranged above the second primary gear along the radial direction and meshes with the second primary gear.

[0010] In some embodiments, a bushing is fixed on the first stop portion, and a protrusion extending along the first axial direction is arranged on the second primary gear, and the centering of the second primary gear is realized by fixing the protrusion and the bushing.

[0011] In some embodiments, further comprising: a gear train housing and a shaft, the gear train housing is used to accommodate the second primary gear, the second driven gear, the third primary gear and the third driven gear, and the shaft is fixed on the gear train housing and arranged in parallel with the first motor shaft.

[0012] In some embodiments, the second driven gear and the third primary gear are coaxially arranged on the shaft, and the second driven gear and the third primary gear are integrally formed by insert injection molding, and the third driven gear is arranged above the third primary gear along the radial direction and meshes with the third primary gear.

[0013] In some embodiments, further comprising: a first ball bearing, an inner ring of the first ball bearing is arranged with the shafting gap, an outer ring of the first ball bearing is arranged with the interference fit of the secondary driven gear.

[0014] In some embodiments, the PCB lower shell is provided with a second stop portion extending along the first axial direction, the first ball bearing is arranged with a gap with the second stop portion, and the second stop portion is used to stop the first ball bearing, the secondary driven gear and the tertiary driven gear from moving in the first axial direction.

[0015] In some embodiments, the part of the shafting that extends beyond the first ball bearing in the first axial direction is arranged with a gap in the radial direction between the second stop portions to provide support when the shafting is deflected.

[0016] In some embodiments, the tertiary driven gear is hot melt welded with the end face of the gear train housing through a second ball bearing to stop the tertiary driven gear from moving in the first axial direction.

[0017] In some embodiments, the upper planet carrier further comprises a ratchet, and the secondary driving gear and the ratchet are integrally formed.

[0018] In some embodiments, further comprising: a parking motor assembly arranged in the gear train housing in a direction perpendicular to the first axial direction, the parking motor assembly is provided with a pawl, and parking is achieved through the cooperation of the pawl and the ratchet.

[0019] In some embodiments, the parking motor assembly comprises a parking motor, a screw rod fixed with a second motor shaft of the parking motor, a first nut matched with the screw rod, and a sliding sleeve sleeved on the first nut, the sliding sleeve is used to assemble the pawl, the gear train housing is insert-molded with a pawl shaft, and the pawl can rotate around the pawl shaft.

[0020] In some embodiments, the parking motor assembly further comprises a check ring and an elastic component, the first nut is sequentially sleeved with the sliding sleeve, the elastic component and the check ring in the direction close to the parking motor along the second axial direction, and the elastic component can be elastically deformed under the limitation of the sliding sleeve and the check ring.

[0021] In some embodiments, the parking motor assembly further comprises a washer, and the washer is sleeved on the end of the first nut away from the parking motor along the second axial direction.

[0022] In some embodiments, the parking motor rotates forward, the first nut moves in the direction close to the ratchet along the second axial direction, the pawl rotates clockwise to be clamped into the tooth gap of the ratchet to achieve parking, and the parking motor rotates reversely, the first nut moves in the direction away from the ratchet along the second axial direction, and the pawl rotates counterclockwise to be released from the tooth gap of the ratchet to release parking.

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

[0024] In some embodiments, the upper planet carrier and the lower planet carrier are fixed by planet pins, one end of the planet pin is interference fit with the upper planet carrier, and the other end of the planet pin is riveted with the lower planet carrier.

[0025] In a second aspect, the utility model also provides a vehicle, including the brake device of any of above-mentioned embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 shows a schematic diagram of a brake device according to an embodiment of the utility model;

[0027] Figure 2 Fig. 2 shows a cross-sectional view of the A region in Fig. 1; Figure 1

[0028] Figure 3 Fig. 3 shows a schematic diagram of a gear train housing according to an embodiment of the utility model;

[0029] Figure 4 Fig. 4 shows a schematic diagram of hot melting welding according to an embodiment of the utility model;

[0030] Figure 5 Fig. 5 shows an exploded view of a parking motor assembly according to an embodiment of the utility model;

[0031] Figure 6A Fig. 6 shows a schematic diagram of a parking motor assembly, a pawl and a ratchet wheel in a parking state according to an embodiment of the utility model;

[0032] Figure 6B Fig. 7 shows a schematic diagram of a parking motor assembly, a pawl and a ratchet wheel in a parking release state according to an embodiment of the utility model. DETAILED DESCRIPTION

[0033] ​The following describes the embodiments of the present application with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] The terms "first", "second", and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail in combination with the drawings.

[0039] Reference Figures 1 to 3The application provides a brake device, comprising a first motor 01, a planetary gear assembly, a second driven gear 10, a third driving gear 12, a third driven gear 13 and a ball screw assembly 16. The first motor 01 comprises a motor shell and is used to provide power for the brake device. In some embodiments, the first motor 01 can be a permanent magnet synchronous motor, which is not specifically limited herein.

[0040] The planetary gear assembly comprises a sun gear (not shown in the figure) arranged in the motor shell, a plurality of planetary gears 27, an inner ring gear 25, a lower planet carrier 24 and an upper planet carrier 35 arranged outside the motor shell. The sun gear is fixed on the first motor shaft 04 of the first motor 01 and can rotate together with the first motor shaft 04. Each planetary gear 27 is engaged with the sun gear and the inner ring gear 25, so that the planetary gear 27 can rotate around the sun gear while rotating on its own axis under the drive of the sun gear. The rotation and revolution of the planetary gear 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 planet pins 26. For example, one end of the planet pin 26 is in interference fit with the upper planet carrier 35, and the other end of the planet pin 26 is riveted to the lower planet carrier 24.

[0041] The second driven gear 10 can rotate under the drive of the upper planet carrier 35, the third driving gear 12 can rotate together with the second driven gear 10, and the third driven gear 13 can rotate under the drive of the third driving gear 12. The ball screw assembly 16 can convert the rotary motion transmitted by the third 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 device is in a clamped state or a released state.

[0042] In other words, when the first motor 01 is in a working state, the first motor shaft 04 drives the sun gear to rotate, the planetary gear 27 revolves around the sun gear under the drive of the sun gear, and at the same time, the planetary gear 27 rotates on its own axis under the constraint of the inner ring gear 25. The rotation and revolution of the planetary gear 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 driven gear 10 rotates under the drive of the upper planet carrier 35, the third driving gear 12 rotates together with the second driven gear 10, and the third driven gear 13 rotates under the drive of the third driving gear 12. The rotation is transmitted to the ball screw assembly 16 through, for example, the spline, so that the ball screw assembly 16 converts the rotary motion transmitted into linear motion, thereby pushing the friction plate 17 to clamp or move away from the brake disc, so that the brake device is in a clamped state or a released state.

[0043] According to the brake device of the present application, since the first motor 01 is directly used to drive the planetary gear assembly, and the sun gear, the plurality of planetary gears 27, the ring gear 25 and the lower carrier 24 of the planetary gear assembly are arranged in the motor housing, the axial dimension can be shortened, and the arrangement of components (such as the pressure sensor 15) is facilitated. In addition, the combination of the planetary gear assembly with high power density and the two-stage gear transmission can improve the transmission ratio of the entire transmission system, thereby reducing the demand for the first motor 01 and reducing the cost; at the same time, the arrangement of the three-stage transmission can reduce the size of the three-stage driven gear 13 at the end of the gear train, which is beneficial to the arrangement of the pressure sensor 15, for example, the plug-in method can be used to connect with the PCB, without the need for the flying wire or spring needle method in the prior art, which does not have mass production feasibility, and the spring needle has the risk of signal instantaneous interruption under vibration conditions.

[0044] In some embodiments, with reference to Figure 1 and Figure 2 , the motor housing is provided with an end cover 02 close to one end of the upper carrier 35 along the first axial direction X1, and the end cover 02 includes the ring gear 25 and a first insert 28 arranged on the ring gear 25. The ring gear 25 is made of plastic material, the first insert 28 and the motor housing are made of aluminum alloy material, and the end cover 02 is fixed with the motor housing through the first insert 28. For example, the first insert 28 is fixed with the motor housing by laser welding, thereby realizing the fixation of the end cover 02 and the motor housing. In some embodiments, the end cover 02 can be injection molded by using plastic particles resistant to electrical corrosion, thereby improving the electric spark and noise problems of the motor.

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

[0046] In some embodiments, the upper carrier 35 includes a two-stage driving gear 05, and the two-stage driven gear 10 is arranged above the two-stage driving gear 05 along the radial direction Y and meshes with the two-stage driving gear 05, that is, the two-stage driving gear 05 can drive the two-stage driven gear 10 to rotate through the meshing. In some embodiments, the two-stage driving gear 05 is provided with a protrusion 051 extending along the first axial direction X1, and a bushing 07 (such as a copper bushing 07) is fixed on the first stop portion 081, and the centering of the two-stage driving gear 05 is realized by fixing the protrusion 051 and the support of the bushing 07.

[0047] In some embodiments, the brake device further comprises a magnetic ring 06 for monitoring the position signal of the first motor 01. Exemplarily, referring to Figure 2 The magnetic ring 06 is fixed in the inner hole of the first motor shaft 04 by glue.

[0048] In some embodiments, referring to Figure 2 and Figure 3 The brake device further comprises a gear train housing 19 and a fixed shaft 09. The gear train housing 19 is used to accommodate the second primary gear 05, the second driven gear 10, the third primary gear 12 and the third driven gear 13. The fixed shaft 09 is fixed on the gear train housing 19 and arranged in parallel with the first motor shaft 04. In this embodiment, the fixed shaft 09 is integrally injection molded with the gear train housing 19. In some embodiments, referring to Figure 1 The second driven gear 10 and the third primary gear 12 are coaxially arranged on the fixed shaft 09 and integrally injection molded.

[0049] In some embodiments, the brake device further comprises a first ball bearing 11. The inner ring of the first ball bearing 11 is arranged in a gap with the fixed shaft 09, and the outer ring of the first ball bearing 11 is in interference fit with the second driven gear 10, so that the second driven gear 10 and the third primary gear 12 can rotate around the fixed shaft 09.

[0050] In some embodiments, the PCB lower housing 08 is provided with a second stop portion 082 extending along the first axial direction X1. The first ball bearing 11 is arranged in a gap with the second stop portion 082, and the second stop portion 082 is used to stop the first ball bearing 11, the second driven gear 10 and the third primary gear 12 from moving in the first axial direction X1. In some embodiments, the part of the fixed shaft 09 that exceeds the first ball bearing 11 in the first axial direction X1 is arranged in a gap with the second stop portion 082 in the radial direction Y, so that the second stop portion 082 can provide support when the fixed shaft 09 is deflected, thereby ensuring smaller shaft deflection and facilitating smooth transmission.

[0051] In some embodiments, referring to Figure 1 and Figure 4 The third driven gear 13 is arranged above the third primary gear 12 in the radial direction Y and engages with the third primary gear 12. In other words, the third primary gear 12 can drive the third driven gear 13 to rotate through engagement. The third driven gear 13 is thermally welded with the end face of the gear train housing 19 through the second ball bearing 14, so as to stop the third driven gear 13 from moving in the first axial direction X1.

[0052] In some embodiments, referring to Figure 1The third driven gear 13 is provided with a caliper housing 18 on the side close to the first motor 01 in the first axial direction X1. The caliper housing 18 is provided with a cavity capable of accommodating and supporting the ball screw assembly 16. The third driven gear 13 and the ball screw assembly 16 are connected through inner and outer splines to transmit the rotation of the third driven gear 13 to the ball screw assembly 16. Illustratively, the rotation of the third driven gear 13 can drive the ball screw assembly 16 to move the second nut (not shown in the figure) in the first axial direction X1, thereby pushing the friction plate 17 to clamp or move away from the brake disc, so that the brake device is in the clamping state or the release state. The inner and outer spline connection can ensure the precise transmission between the ball screw and the second nut.

[0053] In some embodiments, the pressure sensor 15 is arranged between the shaft (not shown in the figure) of the ball screw assembly 16 and the end surface of the caliper housing 18. Referring to Figure 3 The gear train housing 19 is provided with a first connector 20, and the pressure sensor 15 can be connected to the PCB through the first connector 20. In this application, the pressure sensor 15 is connected to the PCB through the connector, which is convenient for connection and more in line with the requirements of mass production feasibility.

[0054] In some embodiments, referring to Figure 3 The brake device further comprises a parking motor assembly 22 arranged in the gear train housing 19 in a direction perpendicular to the first axial direction X1. In other words, the parking motor assembly 22 can be placed horizontally in the gear train housing 19, which is more compact compared to the traditional parallel arrangement with the first motor shaft 04, so that the parking motor assembly 22 is no longer a bottleneck in the axial size arrangement of the brake device, and the axial size is greatly shortened.

[0055] In some embodiments, referring to Figure 1 and Figure 2 The upper planet carrier 35 further comprises a ratchet 03, and the second driving gear 05 and the ratchet 03 are integrally formed. Referring to Figure 6A and Figure 6B The parking motor assembly 22 is provided with a pawl 23, and the parking is achieved through the cooperation of the pawl 23 and the ratchet 03.

[0056] In some embodiments, referring to Figure 5 The parking motor assembly 22 comprises a parking motor 29, a screw rod 30 fixed to the second motor shaft of the parking motor 29, a first nut 34 matched with the screw rod 30, and a sliding sleeve 33 sleeved on the first nut 34. Illustratively, the screw rod 30 is press-fitted on the second motor shaft. The sliding sleeve 33 is used to assemble the pawl 23. Illustratively, the sliding sleeve 33 is provided with a groove 331, and one end of the pawl 23 can be movably connected in the groove 331 of the sliding sleeve 33. Referring to Figure 4The pawl shaft 36 is insert-molded on the gear train housing 19, and the pawl 23 is rotatable around the pawl shaft 36.

[0057] In some embodiments, with reference to Figure 5 The parking motor assembly 22 further comprises a check ring 31 and an elastic component 32. The first nut 34 is sequentially sleeved with a sleeve 33, the elastic component 32 and the check ring 31 in the direction close to the parking motor 29 along the second axial direction X2. The elastic component 32 can be elastically deformed under the limitation of the sleeve 33 and the check ring 31 to adjust the displacement of the pawl 23 along the second axial direction X2, so that the pawl 23 can be more smoothly clamped into the tooth gap of the ratchet wheel 03.

[0058] In the present embodiment, the check ring 31 is in interference fit with the first nut 34 and is arranged at one end of the first nut 34 close to the parking motor 29 along the second axial direction X2, and the other end of the first nut 34 away from the parking motor 29 along the second axial direction X2 is provided with an axial limiting portion. When the sleeve 33 abuts against the axial limiting portion on the first nut 34, the elastic component 32 is in a non-adjusting state; when the sleeve 33 does not abut against the axial limiting portion on the first nut 34, the elastic component 32 is in an adjusting state, and the pawl 23 is moved relative to the first nut 34 through the sleeve 33, so as to adjust the displacement of the pawl 23 along the second axial direction X2, so that the pawl 23 can be more smoothly clamped into the tooth gap of the ratchet wheel 03. In the present embodiment, the elastic component 32 is a push spring, which is not specifically limited here as long as it can adjust the displacement along the second axial direction X2.

[0059] In some embodiments, with reference to Figure 5 The parking motor assembly 22 further comprises a washer 35 sleeved at one 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-shaped washer 35. Through the arrangement of the washer 35, it can prevent the first nut 34 from being easily stuck when moving away from the parking motor 29 along the second axial direction X2, and reduce the parking noise. In some embodiments, with reference to Figure 6A and Figure 6B The screw rod 30 is provided with a third stop portion 301, which can prevent the first nut 34 from being easily stuck when moving close to the parking motor 29 along the second axial direction X2, and reduce the parking noise. After such arrangement, the problems of easy sticking and large action noise of the transmission electromagnet under the radial force can be solved, the requirement for electronic components on the PCB is low, the control is simpler, and the cost is lower.

[0060] The present application realizes the working principle of parking and unparking: with reference to Figure 6AWhen the parking motor 29 rotates forward, the first nut 34 moves in the second axial direction X2 towards the direction of approaching the ratchet wheel 03, the pawl 23 rotates clockwise (as shown by the arrow in the figure) to be clamped into the tooth gap of the ratchet wheel 03, and parking is achieved; with reference to Figure 6B , the parking motor 29 reverses, the first nut 34 moves in the second axial direction X2 away from the ratchet wheel 03, the pawl 23 rotates counterclockwise (as shown by the arrow in the figure) to be released from the tooth gap of the ratchet wheel 03, and the parking is released.

[0061] The parking of the present application can effectively control the connection and disconnection of the ratchet wheel 03 and the pawl 23 through the parking motor 29, thereby effectively locking the transmission system. At the same time, it can quickly switch between the parking state and the driving state, unlike the traditional parking which needs a separate motor gear unit to perform. And compared with the scheme on the market that uses electromagnet to assist parking function, the present application can better solve the noise problem of electromagnet, reduce the risk of parking function failure due to electromagnet being stuck under radial force, and improve the stability of performance under low temperature conditions.

[0062] In some embodiments, with reference to Figure 3 , the gear train housing 19 is provided with a second connector 21, and the parking motor 29 can be connected with the PCB through the second connector 21. The parking motor 29 is connected with the PCB through the connector, which is convenient for connection and more in line with the requirements of mass production feasibility.

[0063] The present application also provides a vehicle comprising the brake device according to any one of the above embodiments.

[0064] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above content is a further detailed description of the present application in combination with specific embodiments, and cannot be regarded as limiting the specific implementation of the present application to these descriptions. Those skilled in the art can make various changes in form and details without departing from the spirit and scope of the present application, including making a number of simple deductions or substitutions.

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 braking device 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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