Vehicle brake device

Abstract

The invention discloses a vehicle braking device, which comprises a retainer, a braking device, a braking device and a braking device, and is characterized in that the retainer comprises a fixed frame and a movable frame; the force applying mechanism comprises a cylinder body formed in the movable frame and a movable sleeve located in the cylinder body; the parking mechanism comprises a push rod, an actuating part and a gear driving mechanism; the inner end of the push rod abuts against the moving sleeve, the actuating component comprises a driven disc and a driving disc which are coaxially arranged, a spiral groove is formed in the inner disc face of the driving disc, a positioning concave is formed in the inner disc face of the driven disc, a ball is arranged between the driving disc and the driven disc, and the ball is positioned in the positioning concave and located in the spiral groove; an elastic strip is arranged in the spiral groove and extends to the deep end of the spiral groove from the shallow end of the spiral groove, the near end of the elastic strip corresponds to the shallow end of the spiral groove, the far end of the elastic strip corresponds to the deep end of the spiral groove, the near end of the elastic strip is fixed to the shallow end of the spiral groove, and the ball makes contact with the elastic strip.

Description

Technical Field

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

[0002] As is well known, brakes in moving vehicles such as automobiles are typically equipped with a parking brake function. A typical parking brake includes: a fixed frame, a movable frame, friction blocks, a force-applying mechanism, and a parking mechanism. The fixed frame is mounted on the vehicle's frame (e.g., bogie). The movable frame is configured to move relative to the fixed frame. The fixed and movable frames have opposing mounting plates that define a gap. A brake disc mounted on the wheel hub enters this gap and is positioned between the two mounting plates. Friction blocks are mounted on the inner side of each mounting plate. Driven by the force-applying mechanism and by the movement of the movable frame relative to the fixed frame, the two friction blocks press synchronously against both sides of the brake disc with a certain pressure, thereby generating braking force. The force-applying mechanism includes a cylinder housed in the movable frame and a movable sleeve disposed in the cylinder. By supplying pressurized oil to the cylinder, the movable sleeve is moved, causing the two friction blocks to approach and press against the brake disc, thereby applying a service brake to the moving vehicle.

[0003] The parking mechanism includes a push rod, a driven disc, a drive disc, and a gear drive mechanism. The push rod is located outside the drive sleeve, with its inner end abutting against the movable sleeve. The driven disc is stacked with the drive disc and located outside the push rod. The drive disc has a rotating shaft extending outward, with its outer end extending out of the cylinder body. The gear drive mechanism includes a driven gear mounted on the outer end of the rotating shaft, a transmission gear meshing with the driven gear, and an actuator (e.g., an electric motor, hydraulic motor, etc.) for driving the gear to rotate so that the driven gear drives the rotating shaft to rotate, thereby driving the drive disc to rotate relative to the driven disc. Multiple helical grooves are machined on the inner surface of the drive disc, arranged circumferentially. Spherical positioning recesses corresponding to these helical grooves are machined on the inner surface of the driven disc. Multiple circumferentially arranged spheres are located between the drive disc and the driven disc, positioned by the positioning recesses to restrict their movement relative to the driven disc. The majority of the spheres are located within the helical grooves. Thus, when parking brake is required, the gear drive mechanism drives the drive disc to rotate forward, causing the spheres to move along the helical grooves to the shallow end, driving the driven disc to move inward, which in turn drives the moving sleeve to move inward, causing the friction block to press against the brake disc, thereby applying parking brake to the moving vehicle. When parking brake needs to be released, the gear drive mechanism drives the drive disc to rotate in the opposite direction, causing the spheres to move to the deep end of the helical groove. Under the reaction force of the brake disc, the moving sleeve drives the push rod and the driven disc to move outward, thereby releasing the parking brake.

[0004] The aforementioned brakes in the prior art have the following drawbacks: During the release of the parking brake, the gear drive mechanism causes the drive disc to rotate at a high angular velocity in the opposite direction. After rotating to a preset angle, the angular velocity rapidly drops to zero. This results in the following: the excessive angular velocity may cause the ball to momentarily lose contact with the bottom of the spiral groove (i.e., the ball and the bottom of the spiral groove cannot maintain contact), which in turn causes the ball to disengage from the positioning recess. This, in turn, disrupts the guiding and positioning relationship between the driven disc, the drive disc, and the ball (for example, the ball comes out of the positioning recess and generates an undesirable relative movement with the driven disc); and the instantaneous drop of the angular velocity to zero will cause severe impact on the relevant components.

[0005] To overcome this defect, existing technology incorporates a clutch structure between the driven gear and the shaft. Specifically, a clutch disc is mounted on the outer end of the shaft, coaxially aligned with the driven gear and capable of relative rotation. The clutch disc has an arc-shaped groove, and a clutch pin is mounted on the driven gear, passing through the arc-shaped groove. When the parking brake is applied, the driven gear rotates forward, and the end of the arc-shaped groove pushes against the clutch pin, causing the clutch disc to rotate synchronously, which in turn drives the drive disc to rotate. When the parking brake needs to be released, the driven gear rotates in the reverse direction, disengaging the clutch. Because the column is located in the arc groove, the clutch disc is not directly driven by the driven gear (or rigidly driven). The reverse rotation of the clutch disc and the driven disc is achieved by the reaction force of the brake disc on the hub and / or the elastic force of the spring in the cylinder, as well as by the helical extension of the bottom of the helical groove and the cooperation of the ball. Furthermore, thanks to the fact that the bottom of the helical groove and the ball do not have a self-locking feature in theory, the drive disc can reverse. Thus, the reverse speed of the drive disc is less than that of the driven gear, which can overcome the above defects to a certain extent.

[0006] However, the applicant discovered the following when using the brake with the specific clutch structure described above: Although the fit between the spiral groove and the ball is theoretically not self-locking, with increased usage frequency, defects that are not conducive to the rolling or sliding of the ball will appear on the surface of the ball and the bottom and walls of the spiral groove. For example, the surface roughness will increase, the sphericity of the ball will deteriorate, and pits will appear on the bottom of the groove. This will cause the ball to move unsmoothly along the spiral groove, which will make it difficult for the drive disc to reverse or reverse into place, and thus make it difficult to fully release the parking brake. Summary of the Invention

[0007] To address the aforementioned technical problems in the prior art, embodiments of the present invention provide a vehicle braking device.

[0008] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of the present invention is as follows: A vehicle braking device, comprising: The cage includes a fixed frame and a movable frame, the movable frame being movable relative to the fixed frame. The fixed frame and the movable frame are respectively equipped with a first friction block and a second friction block arranged opposite to each other, and the brake disc of the vehicle's wheel hub is located between the first friction block and the second friction block. The force-applying mechanism includes a cylinder formed within the movable frame and a movable sleeve located within the cylinder and facing the first friction block. The movable sleeve pushes the first friction block inward, causing the first friction block and the second friction block to approach each other and press against the brake disc. A parking mechanism includes a push rod, an actuating component, and a gear drive mechanism. The inner end of the push rod abuts against the movable sleeve. The actuating component is located on the outer side of the push rod and includes a driven disk and a receiving disk arranged coaxially. The gear drive mechanism can drive the driving disk to rotate. A helical groove is arranged on the inner surface of the driving disk, and a positioning recess is formed on the inner surface of the receiving disk. A ball is arranged between the driving disk and the receiving disk, and the ball is positioned in the positioning recess and located in the helical groove. An elastic strip is provided in the spiral groove, the elastic strip extends from the shallow end of the spiral groove to the deep end of the spiral groove, the proximal end of the elastic strip corresponds to the shallow end of the spiral groove, the distal end of the elastic strip corresponds to the deep end of the spiral groove, the proximal end of the elastic strip is fixed to the shallow end of the spiral groove, and the sphere is in contact with the elastic strip.

[0009] Preferably, the drive disc includes a main disc and a cover disc fastened to the inner surface of the main disc. The spiral groove is formed on the main disc, and the area of ​​the cover disc opposite to the spiral groove is provided with an arc-shaped notch. The width of the arc-shaped notch is smaller than the width of the elastic strip, and the ball contacts the elastic strip through the arc-shaped notch.

[0010] Preferably, a rotating shaft extends from the outer surface of the drive disc and extends beyond the cylinder body; The gear drive mechanism includes a driven gear, a transmission gear meshing with the driven gear, and an actuator for driving the driven gear to rotate via the transmission gear. A clutch mechanism is provided between the gear drive mechanism and the rotating shaft, and the clutch mechanism includes: A clutch disc is fixed to the outer end of the rotating shaft and coaxial with the driven gear. The clutch disc rotates synchronously with the rotating shaft, and the driven gear rotates relative to the rotating shaft. An arc-shaped groove is provided on the clutch disc. A clutch column, which is fixed to the driven gear and passes through an arc-shaped groove of the clutch disc axially; when the driven gear rotates in the forward direction, the driven gear pushes against the end of the arc-shaped groove through the clutch column to drive the clutch disc to rotate. The flexible drive mechanism is configured as follows: When the driven gear rotates in the opposite direction and resets, the flexible drive mechanism drives the clutch disc to rotate in the opposite direction, and the reset of the clutch disc lags behind the reset of the driven gear.

[0011] Preferably, the flexible drive mechanism includes: A torsion disc, which is coaxially arranged with the clutch and is rotatable relative to the clutch disc, has radially protruding radial rods on its edge for contacting the clutch column; A torsion spring is disposed between the torsion disc and the clutch disc to apply a torsional elastic force between the torsion disc and the clutch disc.

[0012] Preferably, the clutch disc has at least two circumferentially arranged arc-shaped grooves, each arc-shaped groove is provided with a clutch post, and each clutch post corresponds to a radial rod.

[0013] Preferably, the edge of the driven disk is formed with an axially extending retaining sleeve, which is sleeved on the outside of the driving disk.

[0014] Preferably, a first spring is provided inside the cylinder, the first spring being used to push the driven disc outward.

[0015] Preferably, the push rod includes a rod body and a push sleeve. The rod body is fixedly connected to the driven disc, the push sleeve is sleeved on the rod body and threadedly connected to the rod body, and the inner end of the push sleeve abuts against the movable sleeve.

[0016] Preferably, a second spring is provided between the movable sleeve and the push sleeve.

[0017] Preferably, the surface of the elastic strip facing the sphere is chrome-plated.

[0018] Compared with the prior art, the beneficial effects of the vehicle braking device provided by the present invention are: 1. The vehicle braking device provided by the present invention can, to a certain extent, prevent the ball in the parking mechanism from dislodging from the positioning recess of the driven disc, thereby preventing the parking brake from failing due to the ball dislodging from the positioning recess.

[0019] 2. The clutch mechanism in the vehicle braking device provided by the present invention can not only reduce the angular velocity of the reverse rotation of the drive disc in the parking mechanism, but also solve the problem of difficulty in fully releasing the parking brake caused by the drive disc being difficult to reverse or difficult to reverse into position. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a vehicle braking device provided in an embodiment of the present invention.

[0021] Figure 2 This is a front sectional view of a vehicle braking device provided for an embodiment of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the parking mechanism of a vehicle braking device provided in an embodiment of the present invention.

[0023] Figure 4 This is a three-dimensional structural schematic diagram of the parking mechanism of the vehicle braking device provided in an embodiment of the present invention.

[0024] Figure 5 An exploded perspective view of the actuating component of a vehicle braking device provided for an embodiment of the present invention.

[0025] Figure 6 A three-dimensional assembly view of the actuating components of a vehicle braking device provided for an embodiment of the present invention.

[0026] Figure 7 A first state view of the clutch mechanism of a vehicle braking device provided for an embodiment of the present invention.

[0027] Figure 8 A second state view of the clutch mechanism of a vehicle braking device provided for an embodiment of the present invention.

[0028] Figure 9 A third state view of the clutch mechanism of a vehicle braking device provided for an embodiment of the present invention.

[0029] In the picture: 10-Cage; 11-Fixed bracket; 111-First mounting plate; 112-First friction block; 12-Modible bracket; 121-Second mounting plate; 122-Second friction block; 20-Force application mechanism; 21-Moving sleeve; 22-Cylinder body; 30-Push rod; 31-Rod body; 32-Push sleeve; 40-Actuating component; 41-Driven disc; 411-Positioning recess; 412-Cage sleeve; 42-Drive disc; 42 1-Main body disc; 422-Cover disc; 423-Helical groove; 424-Arc-shaped notch; 43-Sphere; 44-Elastic strip; 45-Rotating shaft; 50-Gear drive mechanism; 51-Driven gear; 511-Clutch column; 60-Clutch mechanism; 61-Clutch disc; 611-Arc-shaped groove; 62-Torsion disc; 621-Radial rod; 63-Torsion spring; 71-First spring; 72-Second spring; 100-Brake disc. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a vehicle braking device, which is equipped with a parking brake function. The braking device includes a retainer 10, a force application mechanism 20, and a parking mechanism.

[0032] The retainer 10 includes a fixed frame 11 and a movable frame 12. The fixed frame 11 is mounted on the frame (e.g., bogie) of a moving vehicle (e.g., an automobile). The movable frame 12 engages with the fixed frame 11 via a component such as a guide post, thereby allowing the movable frame 12 to move relative to the fixed frame 11. The fixed frame 11 has a first mounting plate 111, and the movable frame 12 has a second mounting plate 121. The first mounting plate 111 and the second mounting plate 121 are arranged opposite to each other and spaced apart. A first friction block 112 is mounted on the inner side of the first mounting plate 111, and a second friction block 122 is mounted on the inner side of the second mounting plate 121. The edge of the brake disc 100 on the wheel hub of the moving vehicle extends into the gap defined by the first friction block 112 and the second friction block 122. Thus, the first friction block 112 and the second friction block 122 are located on both sides of the brake disc 100. The first friction block 112 and the second friction block 122 brake the wheel hub by pressing against the disc surfaces on both sides of the brake disc 100, thereby braking the vehicle.

[0033] The force-applying mechanism 20 is mounted on the movable frame 12. The force-applying mechanism 20 includes a cylinder 22 disposed within the movable frame 12 and a movable sleeve 21 disposed within the cylinder 22, facing the first friction block 112 and movable along the cylinder 22. When the vehicle needs to brake, i.e., when service braking is required, pressurized oil is supplied to the cylinder 22 to drive the movable sleeve 21 to move towards the first friction block 112 and push against it. Through the cooperation between the movable frame 12 and the fixed frame 11, the first friction block 112 and the second friction block 122 approach each other and press against both sides of the brake disc 100, thereby applying service braking. When continued driving is required, in response to the removal of the brake pedal, the pressure of the pressurized oil on the movable sleeve 21 is released. Simultaneously, the reaction force of the brake disc 100 on the two friction blocks causes the friction blocks to move away from the brake disc 100, thereby releasing service braking.

[0034] The parking mechanism is used to apply the parking brake. The parking mechanism includes: push rod 30, actuating component 40, gear drive mechanism 50 and clutch mechanism 60.

[0035] like Figure 3 , 5 6, and combined Figure 2 As shown, the push rod 30 includes a rod body 31 and a push sleeve 32. The push sleeve 32 is sleeved on the rod body 31 and threadedly connected to the rod body 31. The inner end of the push sleeve 32 extends into the movable sleeve 21 of the force-applying mechanism 20 to push against the movable sleeve 21. The actuating component 40 is located outside the push rod 30. The actuating component 40 includes a driven disk 41 and a driving disk 42. The driven disk 41 is fixedly connected to the rod body 31. Preferably, the rod body 31 and the driven disk 41 are integrally formed, that is, the rod body 31 extends axially from the driven disk 41. A retaining ring is installed inside the movable sleeve 21. A spring (let's call it a second spring 72) is installed between the retaining ring and the stepped surface of the push sleeve 32. The second spring 72 is used to apply elastic force to the push sleeve 32 so that a certain preload is formed between the push sleeve 32 and the movable sleeve 21, thereby avoiding the generation of a gap between the two.

[0036] The driven disk 41 has a retaining sleeve 412 on its edge, and the driving disk 42 is located in the retaining sleeve 412 to limit the radial runout of the driving disk 42 relative to the driven disk 41. A rotating shaft 45 extends axially from the outer surface of the driving disk 42 and extends out of the cylinder body 22. A bearing is installed between the end of the driving disk 42 and the cylinder body 22, so that the driving disk 42 can rotate relative to the movable frame 12 to receive the drive of the gear drive mechanism 50. A retaining ring is installed on the cylinder body 22 inside the driven disk 41, and a spring (let's call it a first spring 71) is installed between the retaining ring and the driven disk 41. The first spring 71 is used to apply a spring force to the driven disk 41 so that there is a certain preload between the driven disk 41 and the driving disk 42.

[0037] The actuating component 40 also includes a ball 43 and an elastic strip 44; the inner surface of the drive disk 42 (i.e., the disk surface opposite to the driven disk 41) is provided with a plurality of spiral grooves 423, which are arranged circumferentially, each spiral groove 423 extending circumferentially, and the depth of the bottom of the spiral groove 423 continuously increases along the extending direction. Therefore, the spiral groove 423 has a shallow end with a smaller distance from the inner surface of the drive disk 42 and a deep end with a larger distance from the inner surface; the elastic strip 44 includes a plurality of elastic strips, one of which is arranged in each spiral groove 423. Both sides of the elastic strip 44 are planar. The elastic strip 44 extends along the extension direction of the spiral groove 423. That is, the elastic strip 44 is an arc-shaped strip structure. The elastic strip 44 has a proximal end and a distal end according to the extension direction. Therefore, the proximal end of the elastic strip 44 corresponds to the shallow end of the spiral groove 423, and the distal end of the elastic strip 44 corresponds to the deep end of the spiral groove 423. The proximal end of the elastic strip 44 is fixed to the shallow end of the spiral groove 423 by screws, rivets, etc., so that the distal end of the elastic strip 44 remains in a free state. Therefore, the distal end of the elastic strip 44 is the free end of the elastic strip 44. Thus, when the elastic strip 44 is in a free state, for example, when the elastic strip 44 is not subjected to axial pressure at any position, or when the elastic strip 44 is only subjected to pressure at its proximal end, the elastic strip 44 will not undergo axial elastic deformation, and the elastic strip 44 is located in a plane. At this time, the distance between the elastic strip 44 and the bottom of the spiral groove 423 from its proximal end to its distal end continuously increases. However, when the elastic strip 44 is under pressure, for example, when the elastic strip 44 is subjected to axial pressure (pressure at a non-proximal end), the elastic strip 44 will produce axial elastic deformation. At the same time, the elastic strip 44 exerts a reverse elastic force on the force exertor due to its elastic recovery capability.

[0038] Multiple positioning recesses 411 are formed on the inner surface of the driven disk 41, and each positioning recess 411 corresponds to a plurality of spiral grooves 423 of the driving disk 42. A sphere 43 is located between the driven disk 41 and the driving disk 42. Multiple spheres 43 are included, and each sphere 43 also corresponds to a spiral groove 423. When the actuating component 40 is installed, the spheres 43 are embedded in the positioning recesses 411, with most of the sphere 43 located in the spiral grooves 423, and the spheres 43 are in contact with the surface of the elastic strip 44.

[0039] The gear drive mechanism 50 drives the drive disc 42 to rotate via the drive shaft 45, either directly or indirectly, for applying and releasing the parking brake. Specifically, when the parking brake needs to be applied, the drive disc 42 rotates from the shallow end to the deep end of the spiral groove 423 (i.e., forward rotation). At this time, the ball 43 moves from the deep end along the spiral groove 423 towards the shallow end and eventually reaches the shallow end. At the beginning of the rotation, the ball 43 is located at the deep end of the spiral groove 423. The pressure of the ball 43 on the elastic strip 44 causes the elastic strip 44 to be in an elastic deformation state. As the ball 43 moves towards the deep end, the elastic strip 44 elastically returns to its original position. During this process, the ball 43 generates an axial inward displacement relative to the drive disc 42. The drive disc 42 moves axially inward, thereby driving the driven disc 41 to move inward by the push rod 30, which in turn pushes the moving sleeve 21 inward, causing the two friction blocks to move closer together to apply the parking brake. If it is necessary to release the parking brake, the drive disc 42 rotates from the deep end to the shallow end of the spiral groove 423 (i.e., in the opposite direction). At this time, the ball 43 moves from the shallow end along the spiral groove 423 towards the deep end and finally moves to the deep end. During the process of the ball 43 moving to the deep end, the ball 43 generates an axial outward displacement relative to the drive disc 42. Thus, under the reaction force of the brake disc 100, the moving sleeve 21 drives the push rod 30 and the driven disc 41 to move outward. At this time, the two friction blocks move away from each other, thereby releasing the parking brake.

[0040] If the elastic strip 44 is not provided in the spiral groove 423, the following problems may occur during the release of the parking brake: 1. If the angular velocity of the reverse rotation of the drive disk 42 is too large (for example, if the drive disk 42 is driven by the gear drive mechanism 50 (let's call it rigid drive) and rotates synchronously and rapidly in the opposite direction with the driven gear 51 in the gear drive mechanism 50), the axial movement speed of the driven disk 41 is insufficient to keep the ball 43 in contact with the bottom of the spiral groove 423. As a result, the ball 43 loses the force that keeps it in the positioning recess 411 of the driven disk 41, and therefore, the ball 43 may come out of the positioning recess 411.

[0041] 2. If the reaction force of the brake disc 100 is used to drive the reverse rotation of the drive disc 42 instead of the gear drive mechanism 50 directly driving the drive disc 42 to rotate in the reverse direction, the following problems may occur: the surface of the ball 43 and the bottom and walls of the spiral groove 423 will have defects that are not conducive to the rolling or sliding of the ball 43, such as increased surface roughness, poor sphericity of the ball 43, and pits at the bottom of the groove. This will cause the ball 43 to move unsmoothly along the spiral groove 423, which will make it difficult for the drive disc 42 to reverse or to reverse into place, and thus make it difficult to fully release the parking brake.

[0042] The following section describes the contribution of the present invention in setting an elastic strip 44 in the spiral groove 423 to solving the above-mentioned problems.

[0043] During the reverse rotation of the drive disk 42 driven by the gear drive mechanism 50, the ball 43 moves from the shallow end to the deep end along the spiral groove 423. Since the elastic strip 44 is a flat strip in its free state, the ball 43 is always in contact with the elastic strip 44 and applies pressure to the elastic strip 44 during the movement of the ball 43, causing the elastic strip 44 to undergo elastic deformation. At the same time, the elastic strip 44 applies a reverse elastic force to the ball 43 due to the elastic deformation. This elastic force serves as a force to keep the ball 43 in the positioning recess 411 of the driven disk 41, thereby preventing the ball 43 from falling out of the positioning recess 411 of the driven disk 41 due to excessive angular velocity of the reverse rotation of the drive disk 42.

[0044] In some preferred configurations of the actuating component 40, the drive disc 42 is configured to include a main disc 421 and a cover disc 422. The cover disc 422 is fastened to the main disc 421 and secured by fasteners, thus allowing the main disc 421 and the cover disc 422 to be separated. A spiral groove 423 is formed on the main disc 421, and an arc-shaped notch 424 is formed in the area of ​​the cover disc 422 opposite to the spiral groove 423. The width of the arc-shaped notch 424 is smaller than the width of the elastic strip 44, and the ball 43 contacts the elastic strip 44 through the arc-shaped notch 424. In this preferred configuration, because the width of the elastic strip 44 is smaller than the width of the arc-shaped notch 424, the cover disc 422 confines the elastic strip 44 within the spiral groove 423 and prevents the elastic strip 44 from entering the arc-shaped notch 424, thereby limiting the elastic strip 44 from warping in the opposite direction to the spiral groove 423, and reducing the jamming of the ball 43 caused by the warping of the elastic strip 44. Preferably, the surface of the elastic strip 44 facing the sphere 43 is chrome-plated to increase the wear resistance and hardness of the elastic strip 44, thereby reducing the number of times the elastic strip 44 needs to be replaced.

[0045] like Figure 2 , 4 7, 8, 9, and combined Figure 2As shown, the gear drive mechanism 50 includes a driven gear 51, a transmission gear (not shown), and an actuator (not shown). The driven gear 51 meshes with the transmission gear, and the actuator drives the driven gear 51 to rotate by driving the transmission gear to rotate. The actuator can be a motor capable of providing forward and reverse rotation, or a hydraulic motor capable of providing forward and reverse rotation. A clutch mechanism 60 is disposed between the driven gear 51 and the rotating shaft 45. The clutch mechanism 60 includes a clutch disc 61, a clutch pin 511, and a flexible drive mechanism. The driven gear 51 and the rotating shaft 45 are arranged coaxially, and the driven gear 51 can rotate relative to the rotating shaft 45 by providing a bearing between the driven gear 51 and the rotating shaft 45. The clutch disc 61 is fixed to the end of the rotating shaft 45 and arranged coaxially with the rotating shaft 45, so that the rotating shaft 45 rotates synchronously with the clutch disc 61, thereby allowing the clutch disc 61 and the driven gear 51 to rotate relative to each other. The clutch disc 61 has multiple arc-shaped grooves 611 arranged circumferentially. Multiple clutch posts 511 are fixed to the side of the driven gear 51 opposite to the clutch disc 61, with each clutch post 511 corresponding to one of the arc-shaped grooves 611. The flexible drive mechanism includes a torsion disc 62 and a torsion spring 63. The torsion disc 62 is sleeved on the rotating shaft 45 and can rotate relative to the rotating shaft 45. The edge of the torsion disc 62 has a radially protruding radial rod 621, which is located on one side of the driven gear 51 in the opposite direction of rotation relative to the clutch posts 511. The torsion spring 63 is located between the torsion disc 62 and the clutch disc 61, providing elastic torque between them. This elastic torque is used to apply torque to the clutch disc 61.

[0046] The function of the clutch mechanism 60 mentioned above will be explained below.

[0047] Before introducing the function of the clutch mechanism 60, let's refer to the end of the arc-shaped groove 611 located on the side in the forward rotation direction as the first end, and the end located on the side in the reverse rotation direction as the second end (e.g., Figure 7 As shown, the right end of the top arc-shaped groove 611 is called the first end, and the left end is called the second end.

[0048] like Figure 9 As shown, before the parking brake is applied, the radial rod 621 of the torsion disc 62 is stopped by the clutch column 511, and the elastic torque applied by the torsion spring 63 to the clutch disc 61 causes the first end of the arc groove 611 to abut against the clutch column 511.

[0049] When parking brake needs to be applied, the driven gear 51 rotates in the forward direction, that is, as shown in the figure. Figure 9In the state shown, the driven gear 51 rotates clockwise. Because the clutch column 511 abuts against the first end of the arc-shaped groove 611, it drives the clutch disc 61 to rotate synchronously, which in turn drives the drive disc 42 to rotate in the forward direction through the rotating shaft 45. Figure 7 As described above, after the driven gear 51 rotates to a preset angle (less than 90 degrees), the drive disc 42 and the driven disc 41 cooperate to drive two friction blocks to apply sufficient pressure to the brake disc 100, thereby achieving parking brake. During the rotation of the driven gear 51, the clutch disc 61 and the torsion disc 62 are always subject to elastic torque, causing the torsion disc 62 to rotate with the clutch disc 61. After the driven gear 51 rotates to the preset angle and stops rotating, the radial rod 621 remains located on the side of the clutch column 511 and maintains contact with the clutch rod.

[0050] When the parking brake needs to be released, the driven gear 51 rotates in the opposite direction. During this process, the clutch column 511 moves towards the second end of the arc-shaped groove 611. Simultaneously, the clutch column 511 pushes against the radial rod 621 to drive the torsion disc 62 to rotate synchronously with the driven gear 51. However, since a torsion spring 63 is provided between the clutch disc 61 and the torsion disc 62, the clutch disc 61 is driven by the elastic torque applied by the torsion spring 63 rather than by the driven gear 51 directly. Figure 8 As shown, this results in the angular velocity of the clutch disc 61 being less than that of the driven gear 51. Consequently, the reset time of the clutch disc 61 lags behind the reset time of the driven gear 51 (reset refers to the return of the driven gear 51 and the clutch disc 61 to their angular states before the parking brake was applied). This, to some extent, avoids the elastic strip 44 being unable to maintain the ball 43 at the positioning recess 411 of the driven disc 41 due to the excessively fast reverse rotation angular velocity of the drive disc 42. Furthermore, compared to the clutch structure in the prior art, the advantage is that the drive disc 42 is driven to rotate in the reverse direction and reset by the elastic torque provided by the torsion spring 63, thus avoiding the need to rely entirely on the reaction force of the braking force to drive the drive disc 42 to rotate in the reverse direction. This, in turn, avoids the problem of the drive disc 42 being difficult to reverse or difficult to reverse into place due to defects such as increased surface roughness of the ball 43, and thus, to some extent, avoids the problem of difficulty in fully releasing the parking brake. The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A vehicle braking device, characterized in that, include: The cage includes a fixed frame and a movable frame, the movable frame being movable relative to the fixed frame. The fixed frame and the movable frame are respectively equipped with a first friction block and a second friction block arranged opposite to each other, and the brake disc of the vehicle's wheel hub is located between the first friction block and the second friction block. The force-applying mechanism includes a cylinder formed within the movable frame and a movable sleeve located within the cylinder and facing the first friction block. The movable sleeve pushes the first friction block inward, causing the first friction block and the second friction block to approach each other and press against the brake disc. The parking mechanism includes a push rod, an actuating component, and a gear drive mechanism; The inner end of the push rod abuts against the movable sleeve. The actuating component is located on the outer side of the push rod. The actuating component includes a driven disk and a receiving disk arranged coaxially. The gear drive mechanism can drive the driving disk to rotate. A spiral groove is arranged on the inner surface of the driving disk. A positioning recess is formed on the inner surface of the driven disk. A ball is arranged between the driving disk and the driven disk. The ball is positioned in the positioning recess and located in the spiral groove. An elastic strip is provided in the spiral groove, the elastic strip extends from the shallow end of the spiral groove to the deep end of the spiral groove, the proximal end of the elastic strip corresponds to the shallow end of the spiral groove, the distal end of the elastic strip corresponds to the deep end of the spiral groove, the proximal end of the elastic strip is fixed to the shallow end of the spiral groove, and the sphere is in contact with the elastic strip.

2. The vehicle braking device according to claim 1, characterized in that, The drive disc includes a main disc and a cover disc fastened to the inner surface of the main disc. The spiral groove is formed on the main disc. The area of ​​the cover disc opposite to the spiral groove is provided with an arc-shaped notch. The width of the arc-shaped notch is smaller than the width of the elastic strip. The ball contacts the elastic strip through the arc-shaped notch.

3. The vehicle braking device according to claim 1, characterized in that, A rotating shaft extends from the outer surface of the drive disc and extends out of the cylinder body; The gear drive mechanism includes a driven gear, a transmission gear meshing with the driven gear, and an actuator for driving the driven gear to rotate via the transmission gear. A clutch mechanism is provided between the gear drive mechanism and the rotating shaft, and the clutch mechanism includes: A clutch disc is fixed to the outer end of the rotating shaft and coaxial with the driven gear. The clutch disc rotates synchronously with the rotating shaft, and the driven gear rotates relative to the rotating shaft. An arc-shaped groove is provided on the clutch disc. A clutch column is fixed to the driven gear and passes through an arc-shaped groove of the clutch disc axially. When the driven gear rotates in the forward direction, the driven gear pushes against the end of the arc-shaped groove through the clutch column, thereby driving the clutch disc to rotate. The flexible drive mechanism is configured as follows: When the driven gear rotates in the opposite direction and resets, the flexible drive mechanism drives the clutch disc to rotate in the opposite direction, and the reset of the clutch disc lags behind the reset of the driven gear.

4. The vehicle braking device according to claim 3, characterized in that, The flexible drive mechanism includes: A torsion disc, which is coaxially arranged with the clutch and is rotatable relative to the clutch disc, has radially protruding radial rods on its edge for contacting the clutch column; A torsion spring is disposed between the torsion disc and the clutch disc to apply a torsional elastic force between the torsion disc and the clutch disc.

5. The vehicle braking device according to claim 4, characterized in that, The clutch disc has at least two circumferentially arranged arc-shaped grooves, each arc-shaped groove is provided with a clutch post, and each clutch post corresponds to a radial rod.

6. The vehicle braking device according to claim 1, characterized in that, The edge of the driven disk is formed with an axially extending retaining sleeve, which is sleeved on the outside of the drive disk.

7. The vehicle braking device according to claim 1, characterized in that, A first spring is provided inside the cylinder, which is used to push the driven disc outward.

8. The vehicle braking device according to claim 1, characterized in that, The push rod includes a rod body and a push sleeve. The rod body is fixedly connected to the driven disk. The push sleeve is sleeved on the rod body and threadedly connected to the rod body. The inner end of the push sleeve abuts against the movable sleeve.

9. The vehicle braking device according to claim 8, characterized in that, A second spring is provided between the movable sleeve and the push sleeve.

10. The vehicle braking device according to claim 1, characterized in that, The elastic strip is chrome-plated on the surface facing the sphere.

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