Brake drive device and brake

Abstract

This invention relates to a brake drive device and a brake. The brake drive device includes: a housing with a mounting hole, a bearing disposed within the mounting hole, and a flange disposed within the mounting hole; a motor; a transmission device and a lead screw nut, the lead screw nut comprising a lead screw and a nut; the lead screw being rotatably mounted on the housing via the bearing; the lead screw, when rotated, drives the nut to move axially along the lead screw; the flange is fitted onto the lead screw, contacting the lead screw with an arcuate surface; the motor drives the lead screw to rotate via the transmission device. In this invention, when the brake disc exerts axial reaction force on the friction pads, which is transmitted to the bottom wall of the housing via the transmission device, causing the bottom of the housing to tilt and elastically deform, the flange's contact with the arcuate surface of the lead screw can counteract the effect of the housing's tilting elastic deformation on the lead screw. This prevents the housing tilting from causing the lead screw to tilt, resulting in non-parallel meshing, uneven stress on the threads, and potential breakage or jamming.

Description

Technical Field

[0001] This invention relates to a brake drive device and a brake. Background Technology

[0002] The brake achieves braking by contacting the brake disc with inner and outer friction pads. These pads are mounted on a bracket. During braking, the reaction force of the brake disc on the inner and outer friction pads causes the bracket to tilt and deform. This reaction force is transmitted to the housing through the bracket. The screw nut mounted on the bracket is susceptible to uneven thread meshing due to housing deformation, leading to uneven stress on the threads and potential breakage or jamming. When a screw nut and piston drive are used, the structure becomes more complex. Furthermore, when the piston drives the inner friction pads, force transmission and return are not timely, resulting in a dragging phenomenon. Summary of the Invention

[0003] One of the objectives of this invention is to overcome the shortcomings of the prior art and provide a brake drive device and brake that can reduce the impact of bracket deformation on the lead screw nut.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] The brake drive device is characterized in that it comprises:

[0006] The housing has mounting holes, and a bearing is installed in the mounting holes; a flange is also installed in the mounting holes.

[0007] An electric motor, which is mounted on the housing;

[0008] A transmission device is mounted on the housing, and the motor is connected to the transmission device in a transmission connection.

[0009] A lead screw nut, comprising a lead screw and a nut; the nut comprising a tubular portion and a base plate; the base plate being disposed at the end of the tubular portion, the base plate being used to contact and abut against a friction plate; the tubular portion being fitted onto the lead screw; the lead screw being connected to the transmission device; the lead screw being rotatably mounted on the housing via a bearing; the lead screw being configured to drive the nut to move axially along the lead screw when it rotates; a flange being fitted onto the lead screw, the flange contacting the lead screw with an arcuate surface;

[0010] The motor drives the lead screw to rotate through the transmission device.

[0011] According to one embodiment of the present invention, the lead screw includes a threaded portion and a connecting portion; the threaded portion is provided with threads, and the connecting portion is used for connection with a transmission device; the threaded portion and the connecting portion are integrally formed; the diameter of the threaded portion is larger than the diameter of the connecting portion; the lead screw is also provided with a first arcuate surface; the first arcuate surface extends from the threaded portion to the connecting portion.

[0012] According to one embodiment of the present invention, the lead screw passes through the flange, and the inner wall of the flange is provided with a second arc-shaped surface; the first arc-shaped surface is in contact with the second arc-shaped surface.

[0013] According to one embodiment of the present invention, the lead screw is provided with a first anti-rotation structure, and the base plate of the nut is provided with a first mating structure. The first anti-rotation structure cooperates with the first mating structure to restrict the lead screw and the nut from rotating relative to each other after retracting to the bottom.

[0014] According to one embodiment of the present invention, the first anti-rotation structure is a pin, which is disposed on the end face of the lead screw and protrudes from the end face; the first mating structure is a boss; when the projections of the pin and the boss partially coincide along the axial direction, the boss is located on the rotation path of the pin; when the boss contacts the pin, it restricts the lead screw and the nut from rotating relative to each other after retracting to the bottom.

[0015] According to one embodiment of the present invention, the base plate protrudes radially from the tubular portion, and the base plate is provided with a second anti-rotation structure.

[0016] According to one embodiment of the present invention, the second anti-rotation structure is a notch, which is disposed at the edge of the base plate and extends toward the center of the base plate.

[0017] According to one embodiment of the present invention, the lead screw nut is a planetary roller lead screw, and a plurality of rollers are provided between the nut and the lead screw.

[0018] The brake, characterized in that it comprises:

[0019] support

[0020] An inner friction plate and an outer friction plate; the inner friction plate and the outer friction plate are movably mounted on the bracket;

[0021] The aforementioned brake drive device;

[0022] When the nut moves, it abuts against the inner friction plate, causing the inner friction plate and the outer friction plate to move until they come into contact with the brake disc.

[0023] The base plate protrudes radially from the tubular portion, and the base plate is provided with a second anti-rotation structure; the inner friction plate is provided with a second mating structure, and the second anti-rotation structure cooperates with the second mating structure to restrict the rotation of the nut.

[0024] According to one embodiment of the present invention, the second anti-rotation structure is a notch, which is disposed at the edge of the base plate and extends toward the center of the base plate; the second mating structure is a protruding post, which protrudes from the inner friction plate; when the base plate contacts the inner friction plate, the protruding post is inserted into the notch.

[0025] In this invention, the brake drive device and brake, when the axial reaction force of the brake disc on the friction pads is transmitted to the bottom wall of the housing through the transmission device, causing the housing to tilt, the flange and the lead screw, through the arc-shaped surface contact, can offset the effect of the housing tilt deformation on the lead screw, preventing the housing tilt from causing the lead screw to tilt, resulting in non-parallel meshing, uneven force on the threads, and thus breakage or jamming. In this invention, the nut is barrel-shaped, with the base plate contacting the inner friction pad. The base plate and the inner friction pad have surface contact, resulting in a large contact area that is less likely to damage the inner friction pad. Furthermore, the large area of ​​the base plate facilitates the installation of necessary structures, such as anti-rotation structures. The first anti-rotation structure and the first mating structure can limit the relative rotation of the nut and the lead screw after the nut has moved to the bottom, preventing the base plate and the lead screw end face from contacting and jamming. The second anti-rotation structure on the base plate, in conjunction with the second mating structure, can prevent the relative rotation of the nut and the inner friction pad when they are in contact, thus preventing wear on the inner friction pad. Attached Figure Description

[0026] Figure 1A This is a schematic diagram of the brake structure in this invention.

[0027] Figure 1B This is a front view of the brake in Figure 1.

[0028] Figure 2 This is a cross-sectional view of brake AA in Figure 1.

[0029] Figure 3 This is a schematic diagram of the support, inner friction plate, and outer friction plate structure in this invention.

[0030] Figure 4 This is a schematic diagram of the shell structure in this invention.

[0031] Figure 5 for Figure 4 The front view of the shell in the image.

[0032] Figure 6 for Figure 5 BB section view in the middle.

[0033] Figure 7This is a schematic diagram of the nut structure in this invention.

[0034] Figure 8 This is a schematic diagram of the lead screw and nut part of the present invention.

[0035] Figure 9 This is a schematic diagram of the lead screw and flange structure in this invention.

[0036] Figure 10 for Figure 9 Axial sectional view.

[0037] Figure 11 This is a schematic diagram of the lead screw structure in this invention.

[0038] Figure 12 This is a schematic diagram of the flange structure in this invention. Detailed Implementation

[0039] like Figure 1A , Figure 1B , Figure 2 As shown, the brake 100 includes a bracket 101, an inner friction plate 102, an outer friction plate 103, and a drive device. The inner friction plate 102 and the outer friction plate 103 are mounted on the bracket 101 and are movable. The drive device drives the inner friction plate 102 and the outer friction plate 103 to move, so that they contact the brake disc to achieve braking. After braking is completed, the driving force of the drive device is released, and the inner friction plate 102 and the outer friction plate 103 can be automatically reset by springs. This is prior art and will not be described in detail here.

[0040] like Figure 3 As shown, the inner friction plate 102 is provided with a second mating structure, which is a protrusion 104. The protrusion 104 protrudes from the inner friction plate 102. The mounting method of the inner friction plate 102 and the outer friction plate 103 on the bracket 101 can be achieved using existing technology.

[0041] like Figure 2 , Figures 4 to 12 As shown, the drive device includes a housing 120, a motor 130, a transmission device 140, and a lead screw and nut. The motor 130, the transmission device 140, and the lead screw and nut are mounted on the housing 120. The motor 130 drives the lead screw and nut to work through the transmission device 140.

[0042] The motor 130 has a motor shaft 131. The transmission device 140 is a gear transmission device, which includes a gearbox 141, a gear set 142, and an output shaft 143. The gear set 142 is disposed inside the gearbox 141. The gear set 142 is connected to the output shaft 143. The motor shaft 131 is connected to the gear set 142. The motor shaft 131 drives the output shaft 143 to rotate through the gear set 142.

[0043] The lead screw nut is a planetary roller lead screw, whose structure includes a lead screw 151, rollers 155, and a nut 153. The lead screw 151 includes a threaded portion 1511 and a connecting portion 1512. The threaded portion 1511 is provided with threads, and the connecting portion 1512 is used for connection with the transmission device 140. The threaded portion 1511 and the connecting portion 1512 are integrally formed. The diameter of the threaded portion 1511 is larger than the diameter of the connecting portion 1512. The lead screw 151 is also provided with a first arc-shaped surface 1513. The first arc-shaped surface 1513 extends from the threaded portion 1511 to the connecting portion 1512. The lead screw 151 is provided with a first anti-rotation structure, which is a pin 1514. The pin 1514 is disposed on the end face 1515 of the lead screw 151 and protrudes from the end face 1515.

[0044] The nut 153 includes a tubular portion 1531 and a base plate 1532. The tubular portion 1531 forms a cavity 1535. The base plate 1532 is disposed at the end of the tubular portion 1531. The base plate 1532 protrudes radially from the tubular portion 1531. The base plate 1532 is provided with a second anti-rotation structure. The second anti-rotation structure is a notch 1533. The notch 1533 is disposed at the edge of the base plate 1532 and extends a selected length toward the center of the base plate 1532. The base plate 1532 of the nut 153 is provided with a first mating structure, which is a boss 1534. The boss 1534 is located inside the cavity 1535.

[0045] The tubular portion 1531 is fitted onto the threaded portion 1511 of the lead screw 151. Multiple rollers 155 are provided between the tubular portion 1531 and the threaded portion 1511. The multiple rollers 155 are arranged circumferentially. The rollers 155 are threadedly engaged with both the threaded portion 1511 and the tubular portion 1531. The connecting portion 1512 of the lead screw 151 is connected to the output shaft 143 of the transmission device 140. The motor 130 drives the lead screw 151 to rotate via the transmission device 140. When the lead screw 151 rotates, it drives the nut 153 to move axially via the rollers 155. When the projections of the pin 1514 and the boss 1534 partially coincide axially, the boss 1534 is located on the rotation path of the pin 1514. When the nut 153 retracts to the right to its final position, the boss 1534 contacts the pin 1514, thus restricting the relative rotation of the lead screw 151 and the nut 153.

[0046] The housing 120 is provided with a mounting hole 121 and a retainer 127. A bottom wall 126 is provided at one end of the mounting hole 121. A bearing 122 and a flange 123 are disposed within the mounting hole 121. The flange 123 has a first end 1231 and a second end 1232 along the axial direction. A through hole 124 is provided in the middle of the flange 123. A second arcuate surface 125 is provided on the inner wall of the flange 123. The second arcuate surface 125 extends axially and radially from the second end 1232 to the end of the through hole 124. The bearing 122 and the flange 123 are arranged side by side. The bottom wall 126 obstructs the bearing 122 and the flange 123 within the mounting hole 121.

[0047] The housing 120 is connected to the bracket 101. The motor 130 and the gearbox 141 of the transmission device 140 are both mounted on the housing 120. The lead screw nut is installed in the mounting hole 121. The lead screw 151 is rotatably mounted on the housing 120 via the bearing 122. The flange 123 is fitted onto the lead screw 151, and the lead screw 151 passes through the flange 123. The flange 123 is located between the bearing 122 and the nut 153. The first arcuate surface 1513 contacts the second arcuate surface 125. The base plate 1532 of the nut 153 faces the inner friction plate 102. The motor 130 drives the nut 153 to move axially via the transmission device 140. When the nut 153 moves axially, the base plate 1532 abuts against the inner friction plate 102, causing the inner friction plate 102 to approach the brake disc until it contacts the brake disc. The outer friction plate 103 also moves towards the brake disc under the force of the nut 153. Both the inner friction plate 102 and the outer friction plate 103 are in contact with the brake disc, and braking is achieved by friction. When the base plate 1532 is in contact with the inner friction plate 102, the protrusion 104 is inserted into the notch 1533, which can prevent the nut 153 from rotating relative to the inner friction plate 102.

[0048] like Figure 2 and Figure 6 As shown, when the inner friction plate 102 and the outer friction plate 103 contact the brake disc, the reaction force of the brake disc on the outer friction plate 103 will cause the pawl 127 to deform to the left. The reaction force of the brake disc on the inner friction plate 102 is transmitted to the nut 153, the lead screw 151, the flange 123, and the bearing 122, and then to the bottom wall 126, causing the end of the housing 120 where the bottom wall 126 is located to deform to the right. When the end of the housing 120 where the bottom wall 126 is located deforms to the right, the lead screw 151 and the flange 123 contact the second arc surface 125 through the first arc surface 1513, so the lead screw 151 will not tilt, thus preventing uneven stress on the threads of the lead screw 151, roller 155, and nut 153, which could lead to seizing or breakage.

[0049] In this invention, the brake drive device and brake, when the axial reaction force of the brake disc on the friction pads is transmitted to the bottom wall of the housing through the transmission device, causing the housing to tilt, the flange and the lead screw, through arc-shaped surface contact, can offset the effect of the housing tilt deformation on the lead screw. This prevents the housing tilt from causing the lead screw to tilt, resulting in non-parallel meshing, uneven force on the threads, and thus breakage or jamming. In this invention, the nut is set as a barrel shape, utilizing the base plate to contact the inner friction pad. The base plate and the inner friction pad have surface contact, resulting in a large contact area that is less likely to damage the inner friction pad. Moreover, due to the large area of ​​the base plate, it is convenient to set the required structures, such as anti-rotation structures. Setting a first anti-rotation structure and a first mating structure can restrict the nut and the lead screw from continuing to rotate relative to each other after the nut has moved to the bottom, preventing the base plate and the end face of the lead screw from contacting and getting stuck. A second anti-rotation structure is set on the base plate to cooperate with the second mating structure, which can prevent the relative rotation of the nut and the inner friction pad when they are in contact, thus preventing wear on the inner friction pad.

[0050] 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 brake drive device, characterized in that, include: The housing has mounting holes, and a bearing is installed in the mounting holes; a flange is also installed in the mounting holes. An electric motor, which is mounted on the housing; A transmission device is mounted on the housing, and the motor is connected to the transmission device in a driving connection. A lead screw nut, comprising a lead screw and a nut; the nut comprising a tubular portion and a base plate; the base plate being disposed at the end of the tubular portion, the base plate being used to contact and abut against a friction plate; the tubular portion being fitted onto the lead screw; the lead screw being connected to the transmission device; the lead screw being rotatably mounted on the housing via a bearing; the lead screw being configured to drive the nut to move axially along the lead screw when it rotates; a flange being fitted onto the lead screw, the flange contacting the lead screw with an arcuate surface; The motor drives the lead screw to rotate via the transmission device; The lead screw is provided with a first anti-rotation structure, and the base plate of the nut is provided with a first mating structure. The first anti-rotation structure cooperates with the first mating structure to restrict the lead screw and the nut from rotating relative to each other after retracting to the bottom. The base plate protrudes radially from the tubular portion, and the base plate is provided with a second anti-rotation structure.

2. The brake drive device according to claim 1, characterized in that, The lead screw includes a threaded portion and a connecting portion; the threaded portion is provided with threads, and the connecting portion is used to connect with a transmission device; the threaded portion and the connecting portion are integrally formed; the diameter of the threaded portion is larger than the diameter of the connecting portion; the lead screw is also provided with a first arc-shaped surface; the first arc-shaped surface extends from the threaded portion to the connecting portion.

3. The brake drive device according to claim 2, characterized in that, The lead screw passes through the flange, and the inner wall of the flange is provided with a second arc-shaped surface; the first arc-shaped surface is in contact with the second arc-shaped surface.

4. The brake drive device according to claim 1, characterized in that, The first anti-rotation structure is a pin, which is disposed on the end face of the lead screw and protrudes from the end face; the first mating structure is a boss; when the projections of the pin and the boss partially coincide along the axial direction, the boss is located on the rotation path of the pin; when the boss contacts the pin, it restricts the lead screw and the nut from rotating relative to each other after retracting to the bottom.

5. The brake drive device according to claim 1, characterized in that, The second anti-rotation structure is a notch, which is located at the edge of the base plate and extends toward the center of the base plate.

6. The brake drive device according to claim 1, characterized in that, The lead screw nut is a planetary roller lead screw, and multiple rollers are provided between the nut and the lead screw.

7. A brake, characterized in that, include: support An inner friction plate and an outer friction plate; the inner friction plate and the outer friction plate are movably mounted on the bracket; The brake drive device according to any one of claims 1 to 6; When the nut moves, it abuts against the inner friction plate, causing the inner friction plate and the outer friction plate to move until they come into contact with the brake disc.

8. The brake according to claim 7, characterized in that, The base plate protrudes radially from the tubular portion, and the base plate is provided with a second anti-rotation structure; the inner friction plate is provided with a second mating structure, and the second anti-rotation structure cooperates with the second mating structure to restrict the rotation of the nut.

9. The brake according to claim 8, characterized in that, The second anti-rotation structure is a notch, which is located on the edge of the base plate and extends toward the center of the base plate; the second mating structure is a protruding post, which protrudes from the inner friction plate; when the base plate contacts the inner friction plate, the protruding post is inserted into the notch.

Images