Novel brake drive device and brake

Abstract

The application relates to a new brake driving device and a brake, the new brake driving device comprising a motor with a motor shaft, a transmission device connected with the motor shaft, a screw nut comprising a screw rod and a nut, the screw rod being provided with external threads, the nut being provided with internal threads, the nut being sleeved on the screw rod and matched with the screw rod, the screw rod being provided with a tube cavity extending in the axial direction from one end of the screw rod, the transmission device being connected with the screw rod and at least partially located in the tube cavity in the axial direction. The new brake driving device and the brake in the application are characterized in that the screw rod is provided with a tube cavity, the transmission device is partially located in the tube cavity in the axial direction, the axial size of the driving device and the brake can be reduced, and the power output is not affected. Since the axial size is reduced, the radial size can be enlarged, the rigidity of the screw nut or the transmission device can be improved by using more materials, and greater torque can be output.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of brake driving device and brake. BACKGROUND

[0002] The brake used in the automobile is realized by the friction force of the friction plate. The friction plate includes an inner friction plate and an outer friction plate. The outer friction plate is installed on the support, and the inner friction plate is installed on the shell. The support and the shell can move relative to each other, so that the inner friction plate and the outer friction plate can be linked to approach the brake disc to realize braking. The brake is provided with a driving device, which drives the inner friction plate and the outer friction plate to move to realize braking.

[0003] The radial dimension of the position where the brake in the prior art is installed has a larger space, and the axial space is often very tight. The brake in the prior art drives the friction plate to move by the movement of the piston, and the overall axial stroke of the piston and the transmission device is large, which limits the axial size of the brake and cannot be reduced. In order to output a larger torque, the radial dimension of the transmission device, the screw nut and the piston needs to be large enough, which brings a problem that the overall weight of the brake is increased. The reciprocating movement of the piston needs the elastic force of the rubber ring to assist the return, but when the rubber ring has insufficient elastic force, the friction plate will not rebound in time. With the rapid development of new energy vehicles, the requirement for reducing the axial size of the brake is getting higher and higher. However, due to the parallel arrangement of the motor shaft and the output shaft, the radial dimension is large and it is not possible to improve the axial dimension, because the large radial dimension will interfere with other structures of the brake, and the size in the axial direction cannot be reduced. Therefore, how to set a brake driving device and brake with smaller axial size is an important problem faced by the skilled in the art. SUMMARY

[0004] One of the purposes of the present application is to overcome the deficiencies in the prior art, and to provide a new type of brake driving device and brake with smaller axial size.

[0005] To achieve the above purpose, the present application realizes the following technical scheme:

[0006] The new type of brake driving device, characterized in that it comprises:

[0007] A motor, the motor having a motor shaft;

[0008] A transmission device connected with the motor shaft of the motor;

[0009] A screw nut comprising a screw and a nut; the screw is provided with external threads, the nut is provided with internal threads, and the nut is sleeved on the screw and matched with the threads of the screw; the screw is provided with a tube cavity extending axially from one end of the screw;

[0010] The transmission device is connected with the lead screw and is at least partially located in the tube cavity in the axial direction.

[0011] According to one of the technical solutions of the present application, the lead screw comprises a lead screw body, and the tube cavity is arranged on the lead screw body; a partition plate is arranged in the tube cavity and is connected with the lead screw body; and the transmission device is connected with the partition plate.

[0012] According to one of the technical solutions of the present application, the partition plate is located in the middle of the lead screw in the axial direction.

[0013] According to one of the technical solutions of the present application, the partition plate is integrally arranged with the lead screw body.

[0014] According to one of the technical solutions of the present application, the transmission device comprises an internal gear and an output shaft, the output shaft extends from the internal gear; the output shaft is connected with the partition plate, and a first gasket is arranged on the output shaft; the first gasket and the internal gear are located on the two sides of the partition plate, respectively; an elastic device is arranged between the first gasket and the partition plate, one end of the elastic device abuts against the first gasket, and the other end abuts against the partition plate.

[0015] According to one of the technical solutions of the present application, a second gasket is further arranged, the second gasket is sleeved on the output shaft; the first gasket and the second gasket are located on the same side of the partition plate; and the elastic device is located between the first gasket and the second gasket.

[0016] According to one of the technical solutions of the present application, the transmission device has an output shaft, a motor shaft of a motor is connected with the transmission device to drive the output shaft to move; and the output shaft, the motor shaft and a lead screw nut are coaxially arranged.

[0017] Preferably, the output shaft, the motor shaft and the lead screw nut are coaxially arranged.

[0018] According to one of the technical solutions of the present application, the transmission device is a torque amplification transmission device.

[0019] According to one of the technical solutions of the present application, the torque amplification device is at least two-stage torque amplification device.

[0020] According to one of the technical solutions of the present application, the transmission device comprises a motor gear, a primary planetary gear and an internal gear; the motor gear is sleeved on the motor shaft, the primary planetary gear is more than three and surrounds the motor gear and is in mesh with the motor gear; the primary planetary gear is in mesh with the internal gear; the primary planetary gear is directly connected with or transmissionally connected with the output shaft, and the diameter of the primary planetary gear is greater than the diameter of the motor gear.

[0021] According to one of the technical solutions of the present application, the first planetary gear is mounted on the first retainer, and the first planetary gear drives the first retainer to rotate when the first planetary gear rotates; the output shaft is directly connected or drivingly connected with the first retainer; the inner gear has a cavity, and the first retainer and the first planetary gear are arranged in the cavity.

[0022] According to one of the technical solutions of the present application, the first retainer, a transmission gear, second planetary gears and a second retainer are further included; the first retainer is connected with the first planetary gear, and the first planetary gear drives the first retainer to rotate; the transmission gear is mounted on the first retainer; the number of the second planetary gears is more than three, and the second planetary gears are arranged around the transmission gear and meshed with the transmission gear; the second planetary gears are meshed with the inner gear; the diameters of the second planetary gears are greater than that of the transmission gear, and the second retainer is connected with the second planetary gears; the output shaft is connected with the second retainer.

[0023] According to one of the technical solutions of the present application, the transmission gear, the second planetary gears and the second retainer are arranged in the cavity; and the output shaft extends out of the cavity.

[0024] According to one of the technical solutions of the present application, the motor further comprises a motor shell, the motor shell is columnar and is provided with a groove; the groove is recessed in the axial direction from one end of the motor shell; the motor shaft end is located in the groove, and / or the screw nut is partially located in the groove in the axial direction.

[0025] According to one of the technical solutions of the present application, the transmission device comprises an inner gear, and the inner gear has a cavity; and the inner gear is partially or entirely located in the groove in the axial direction.

[0026] According to one of the technical solutions of the present application, the motor further comprises a motor control device, the motor control device comprises a secondary shell and an electronic control module, the secondary shell is connected with the motor shell; the electronic control module is arranged in the secondary shell, and the electronic control module is electrically connected with the motor.

[0027] The brake is characterized in that it comprises the novel brake driving device, and inner friction plates and outer friction plates; the inner friction plates are connected with the nut of the screw nut; the motor drives the inner friction plates and the outer friction plates to approach and move away from each other through the transmission device and the screw nut.

[0028] According to one of the technical solutions of the present application, the nut is provided with a notch, the inner friction plate is provided with a protruding column, and the protruding column cooperates with the notch to prevent the nut from rotating.

[0029] The novel brake driving device and brake in the application, the lead screw is provided with a cavity, the transmission device is partially located in the cavity in the axial direction, the axial dimension of the whole driving device and brake can be reduced without affecting the power output. As the axial dimension is reduced, the radial dimension can be enlarged, the rigidity of the lead screw nut or the transmission device can be improved by using more materials, and a larger torque can be output. The nut is directly connected with the inner friction plate, and the omission of the piston can reduce the axial stroke of the whole transmission device, so that the axial dimension of the brake can be further reduced. The lead screw is provided with a cavity, which can reduce the weight under the condition of increasing the diameter, which can meet the requirement of outputting a large torque without increasing the weight or too much weight. The application omits the piston and directly drives the friction plate by the nut, which is fast in response, timely in action return and reduces the drag. The motor shaft and the output shaft are coaxially arranged, which can reduce the radial dimension of the driving device, increase the flexibility of the design and use of the driving device, and provide a structural basis for reducing the axial dimension of the whole brake. After the radial dimension of the driver is reduced, the axial space of the brake housing can be better utilized, and the driving device is more flexible and adaptable in use. The torque amplification transmission device can amplify the output torque, and the miniaturized driving device can also meet the use requirement. The cavity of the inner gear can accommodate the planetary gear and the retainer and other components, which can make the driving device structure more simple and better adapt to the size design requirement. The application can also simplify the structure of the brake, which is simple in structure. Moreover, the energy loss caused by the vehicle drag can be reduced, and the vehicle endurance can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The figure is a structural diagram of the brake in the application.

[0031] Figure 2 The figure is a sectional view of the brake in the application. Figure 1

[0032] Figure 3 The figure is a structural diagram of the novel brake driving device in the application.

[0033] Figure 4 The figure is a sectional view of the novel brake driving device in the application.

[0034] Figure 5 The figure is a structural diagram of the motor in the application.

[0035] Figure 6 The figure is a structural diagram of the transmission device in the application.

[0036] Figure 7 The figure is a structural diagram of the inner gear in the application.

[0037] Figure 8 The figure is a structural diagram of the transmission device in the application.​

[0038] Figure 9 This is a schematic diagram of another partial structure of the transmission device in this invention.

[0039] Figure 10 This is a schematic diagram of another partial structure of the transmission device in this invention.

[0040] Figure 11 This is a schematic diagram of the shell structure in this invention.

[0041] Figure 12 This is a schematic diagram of the support, inner friction plate, and outer friction plate structure in this invention.

[0042] Figure 13 This is a schematic diagram of the lead screw nut structure in this invention.

[0043] Figure 14 for Figure 13 A cross-sectional view of the lead screw nut. Detailed Implementation

[0044] like Figure 1 , Figure 2 As shown, the brake 100 includes a novel brake drive device 110, a lead screw nut 150, a housing 160, a bracket 170, an inner friction plate 181, and an outer friction plate 182. The inner friction plate 181 and the outer friction plate 182 are movably mounted on the bracket 170. The bracket 170 and the housing 160 are movably connected relative to each other. The novel brake drive device 110 is connected to the housing 160. The novel brake drive device 110 drives the inner friction plate 181 and the outer friction plate 182 to move closer and further apart, thereby achieving braking and releasing the brake.

[0045] like Figures 2 to 10 As shown, the novel brake drive device 110 includes a motor 120, a motor control device 130, and a transmission device 140. The motor control device 130 controls the operation of the motor 120. When the motor 120 is operating, it outputs torque through the transmission device 140.

[0046] The motor 120 includes a motor housing 121 and a motor shaft 122. The motor housing 121 is cylindrical, either round or square, depending on the application. In the example shown, the motor housing 121 is cylindrical. The motor housing 121 has a groove 123. The groove 123 is recessed from one end of the motor housing 121. The motor shaft 122 is located within the groove 123. In the example shown, the end of the motor shaft 122 is located within the groove 123. This prevents the motor shaft 122 from protruding from the end of the motor housing 121, thus reducing the axial size of the motor 120. The motor housing 121 contains components for driving the rotation of the motor shaft 122. The technology for driving the rotation of the motor shaft 122 is existing technology and will not be described further here.

[0047] The motor control device 130 comprises a sub-housing 131 and an electronic control module 132. The sub-housing 131 is provided with an inner cavity, and the electronic control module 132 is installed in the inner cavity. The sub-housing 131 is connected with the motor housing 121, and the two are distributed along the axial direction. The electronic control module 132 is electrically connected with the motor 120. The electronic control module 132 controls the operation of the motor 120 and outputs torque.

[0048] The transmission device 140 comprises an inner gear 141, a motor gear 142, a primary planetary gear 143, a primary retainer 144, a transmission gear 145, a secondary planetary gear 146, a secondary retainer 147, and an output shaft 148. The inner gear 141 is cylindrical and has a cavity 1411. The inner gear 1412 is arranged in the cavity 1411. The motor gear 142 is sleeved on the motor shaft 122. The motor gear 142 and the motor shaft 122 can be separately arranged and then assembled, or can be integrally arranged, that is, the motor gear 142 is machined on the motor shaft 122. The number of the primary planetary gears 143 is more than three, which are arranged around the motor gear 142 and meshed with the motor gear 142. In the example shown in the figure, the number of the primary planetary gears 143 is three. The primary planetary gears 143 are rotatably arranged on the three first pin shafts 1441 of the primary retainer 144 and can rotate around the first pin shafts 1441. The primary planetary gears 143 are meshed with the inner gear 141. The diameter of the primary planetary gears 143 is greater than that of the motor gear 122. The second pin shafts 1442 are also arranged on the primary retainer 144. The second pin shafts 1442 extend in the opposite direction of the first pin shafts 1441. The transmission gear 145 rotates with the primary retainer 144 on the second pin shafts 1442. The number of the secondary planetary gears 146 is more than three, which are arranged around the transmission gear 145 and meshed with the transmission gear 145. The secondary planetary gears 146 are rotatably arranged on the third pin shafts 1471 of the secondary retainer 147. The secondary planetary gears 146 are meshed with the inner gear 141. The diameter of the secondary planetary gears 146 is greater than that of the transmission gear 145. The output shaft 148 is connected with the secondary retainer 147. The output shaft 148 and the third pin shafts 1471 extend in the opposite direction. The output shaft 148 extends out of the cavity 1411. The output shaft 148 is coaxially arranged with the motor shaft 122, that is, the axis of the output shaft 148 and the axis of the motor shaft 122 are on the same straight line.

[0049] The primary planetary gear 143, primary cage 144, transmission gear 145, secondary planetary gear 146, and secondary cage 147 are all disposed within the cavity 1411 of the internal gear 141. A shim 149 is also disposed outside the primary planetary gear 143. The shim 149 obstructs the primary planetary gear 143 within the cavity 1411. The motor gear 142 passes through the shim 149 and meshes with the primary planetary gear 143. The internal gear 141 is at least partially located within the groove 123 along the axial direction. The axial portion of the internal gear 141 being located within the groove 123 reduces the overall axial dimension of the drive unit.

[0050] The lead screw nut 150 includes a lead screw 151 and a nut 152. The lead screw 151 includes a lead screw body 1511, which has external threads. The lead screw body 1511 has a cavity 1512 extending axially from one end of the lead screw body 1511. A partition 1513 is disposed within the cavity 1512 and is connected to the lead screw body 1511. In the example shown, the lead screw body 1511 and the partition 1513 are integrally formed. The partition 1513 is located at the axial center of the lead screw body 1511. The nut 152 has internal threads. A notch 1521 is provided at the end of the nut 152. The nut 152 is fitted onto the lead screw body 1511 and threadedly engages with it. An output shaft 148 is connected to the partition 1513. The output shaft 148 and the partition plate 1513 can be connected using a common mechanical connection method. The axial portion of the internal gear 141 is located within the cavity 1512. The axial portion of the lead screw nut 150 is located within the groove 123. The lead screw nut 150, the output shaft 148, and the motor shaft 122 are coaxially arranged, meaning their axes are on the same straight line. Specifically, the lead screw body 1511, the output shaft 148, and the motor shaft 122 are coaxially arranged.

[0051] A first washer 1481 and a second washer 1482 are provided on the output shaft 148. The first washer 1481 and the second washer 1482 are spaced apart. The first washer 1481 and the second washer 1482 are located on the same side of the partition 1513. The first washer 1481 is fixedly connected to the output shaft 148. The second washer 1482 is movable relative to the output shaft 148. An elastic device 1483 is fitted on the output shaft 148. One end of the elastic device 1483 abuts against the first washer 1481, and the other end abuts against the second washer 1482. The first washer 1481 and the second washer 1482 are located on both sides of the partition 1513, respectively, along with the internal gear 141.

[0052] The inner friction plate 181 and the outer friction plate 182 are mounted on the bracket 170 and are movable relative to the bracket 170. The inner friction plate 181 and the outer friction plate 182 can move closer to each other and further away. The bracket 170 is connected to the housing 160, and the two can move relative to each other. The motor housing 121 is connected to the bracket 170. The lead screw nut 150 passes through the housing 160 and is connected to the inner friction plate 181. The inner friction plate 181 is provided with a protrusion 183. The protrusion 183 is inserted into the notch 1521, which prevents the nut 152 from rotating with the lead screw 151.

[0053] This invention discloses a novel brake drive device and brake. The lead screw is housed within a cavity, and the axial portion of the transmission device is located within this cavity. This reduces the overall axial dimension of the drive device and brake without affecting power output. Due to the reduced axial dimension, the radial dimension can be increased, allowing for improved material rigidity of the lead screw nut or transmission device, resulting in a larger output torque. The nut is directly connected to the internal friction plate, eliminating the need for a piston and reducing the axial stroke of the entire transmission device, thus further reducing the axial dimension of the brake. The cavity design of the lead screw allows for weight reduction while increasing its diameter, meeting the requirement for high output torque without significantly increasing weight. The invention eliminates the piston, with the nut directly driving the friction plate, resulting in rapid response, timely return to position, and reduced drag. The coaxial arrangement of the motor shaft and output shaft reduces the radial dimension of the drive device, increasing its design and operational flexibility and providing a structural basis for reducing the overall axial dimension of the brake. With a reduced radial dimension of the drive unit, the axial space of the brake housing can be better utilized, freeing it from the constraints of the brake housing's radial space, making the drive device more flexible and adaptable. By utilizing a torque amplification transmission device, the output torque can be amplified, and the miniaturized drive unit can also meet the usage requirements. Using the cavity of the internal gear to house planetary gears and cages, the overall structure of the drive unit is simpler, better adapting to size design requirements. This invention also simplifies the brake architecture, resulting in a simpler structure. Furthermore, it reduces energy loss caused by vehicle dragging, improving vehicle range.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A new brake actuator device, characterized by, The utility model relates to a motorized device, comprising: a motor having a motor shaft; a transmission device connected to the motor shaft of the motor; a screw nut comprising a screw and a nut; the screw is provided with external threads, the nut is provided with internal threads, the nut is sleeved on the screw and threadedly engaged with the screw; the screw is provided with a lumen extending axially from one end of the screw; the transmission device is connected to the screw and at least partially located in the lumen axially, the screw comprises a screw body provided with the lumen; a partition is arranged in the lumen and connected to the screw body; the transmission device comprises: an internal gear and an output shaft extending from the internal gear; the output shaft is connected to the partition and provided with a first gasket; the first gasket and the internal gear are located on opposite sides of the partition respectively; a resilient device is arranged between the first gasket and the partition, one end of the resilient device abuts against the first gasket and the other end abuts against the partition; the internal gear has a cavity, the output shaft extends out of the cavity, a motor gear, a primary planetary gear and a primary retainer; the motor gear is sleeved on the motor shaft, the primary planetary gear surrounds the motor gear and is engaged with the motor gear; the primary planetary gear is engaged with the internal gear; the primary planetary gear is mounted on the primary retainer; the primary planetary gear rotates to drive the primary retainer to rotate; the primary retainer and the primary planetary gear are arranged in the cavity, a third gasket is arranged outside the primary planetary gear, the third gasket blocks the primary planetary gear in the cavity, and the motor gear passes through the gasket and is engaged with the primary planetary gear, a transmission gear, a secondary planetary gear and a secondary retainer; the transmission gear is mounted on the primary retainer; the secondary planetary gear surrounds the transmission gear and is engaged with the transmission gear; the secondary planetary gear is engaged with the internal gear; the secondary retainer is connected to the secondary planetary gear; the output shaft is connected to the secondary retainer, and the transmission gear, the secondary planetary gear and the secondary retainer are arranged in the cavity, a second gasket is further included, the second gasket is sleeved on the output shaft; the first gasket and the second gasket are located on the same side of the partition; the resilient device is located between the first gasket and the second gasket.

2. The novel brake actuator apparatus according to claim 1, wherein, The motor shaft of the motor is connected to the transmission device to drive the output shaft to move; at least two of the output shaft, the motor shaft and the screw nut are coaxially arranged.

3. The novel brake actuator apparatus of claim 2, wherein, The output shaft, the motor shaft and the screw nut are coaxially arranged.

4. The novel brake actuator apparatus according to claim 2, wherein The transmission device is a torque amplification transmission device.

5. The novel brake actuation apparatus according to claim 4, wherein The number of the primary planetary gears is more than three, and the diameter of the primary planetary gears is greater than the diameter of the motor gear.

6. The novel brake actuation apparatus according to claim 5, wherein The number of the secondary planetary gears is more than three, and the diameter of the secondary planetary gears is greater than the diameter of the transmission gear.

7. The novel brake actuator apparatus of claim 2, wherein, The motor further comprises a motor shell, which is columnar and provided with a groove; the groove is recessed axially from one end of the motor shell; and the motor shaft end is located in the groove.

8. The novel brake actuation apparatus according to claim 7, wherein The inner gear is partially or entirely located in the groove in the axial direction, and / or the screw nut is partially located in the groove in the axial direction.

9. The novel brake actuation apparatus according to claim 7, wherein The motor further comprises a motor control device, which comprises a secondary shell and an electronic control module; the secondary shell is connected with the motor shell; the electronic control module is arranged in the secondary shell; and the electronic control module is electrically connected with the motor.

10. A brake, characterised in that The new brake driving device comprises the new brake driving device according to any one of claims 1 to 9, inner friction plates and outer friction plates; the inner friction plates are connected with the screw nut of the screw nut; and the motor drives the inner friction plates and the outer friction plates to move close to or away from each other through the transmission device and the screw nut.

11. The brake of claim 10 wherein, The screw nut is provided with a notch, and the inner friction plate is provided with a protruding column; the protruding column cooperates with the notch to prevent the screw nut from rotating.

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