Integrated lever type electronic mechanical brake

Abstract

The invention discloses an integrated lever type electronic mechanical brake which comprises a power source adopting a motor; the transmission mechanism comprises a lead screw nut pair and a lever assembly, the lead screw nut pair comprises a lead screw connected with the motor and a nut installed on the lead screw, and the lever assembly comprises a lever connected with the nut, a cam installed at the bottom end of the lever and a cam shaft installed in the center of the cam. Braking torque of the motor is transmitted to the lever through the lead screw nut pair, drives the upper part of the lever to move and drives the cam and the cam shaft of which the lower parts are connected with the lever to rotate; the executing mechanism comprises a dynamic friction plate and a static friction plate, and the cam drives the dynamic friction plate to be matched with the static friction plate to rub a brake disc between the dynamic friction plate and the static friction plate to achieve braking; and the brake holding mechanism is used for carrying out brake holding or brake holding releasing on the executing mechanism. The device is simple in structure, capable of reducing speed and increasing torque at a large speed ratio, low in requirements for sealing performance and lubricating performance of a transmission pair, easy to implement, and reliable and simple in brake keeping and releasing.

Description

Technical Field

[0001] The invention relates to an integrated lever type electronic mechanical brake, belonging to the technical field of electronic mechanical brakes. Background Art

[0002] At present, electronic mechanical brakes (EMB) are mainly developed and applied in passenger cars. The basic principle is to use a motor to transmit torque to a gear rack, or a screw nut, or a worm gear and other mechanisms through a gear combination that reduces speed and increases torque, converting rotational motion into linear motion. The end of the motion is connected to the brake actuator to achieve braking. Since the power source of the brake comes from the motor, it can be connected to the whole machine control system, which is easy to control and can realize advanced intelligent models. However, this brake has the following disadvantages: the transmission ratio of the deceleration and torque increase mechanism is difficult to increase, otherwise the volume is too large; the gear pair is difficult to process and manufacture; the transmission pair has high requirements for sealing and lubricity; the brake is maintained by the gear pair or the screw nut pair itself, which is prone to failure. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides an integrated lever-type electronic mechanical brake to solve the problems that the transmission ratio of the electronic mechanical brake deceleration and torque-increasing mechanism is difficult to increase, the gear pair is difficult to process and manufacture, and the sealing and lubricity requirements of the transmission pair are high.

[0004] In order to achieve the above object, the present invention adopts an integrated lever-type electromechanical brake, comprising:

[0005] Power source: electric motor;

[0006] The transmission mechanism includes a screw-nut pair and a lever assembly, wherein the screw-nut pair includes a screw connected to a motor and a nut mounted on the screw, and the lever assembly includes a lever connected to the nut, a cam mounted at the bottom end of the lever, and a camshaft mounted at the center of the cam, wherein the braking torque of the motor is transmitted to the lever through the screw-nut pair and drives the upper part of the lever to move, thereby driving the cam and the camshaft connected to the lower part of the lever to rotate;

[0007] The actuator comprises a dynamic friction plate and a static friction plate, wherein the cam drives the dynamic friction plate to cooperate with the static friction plate to rub the brake disc between the dynamic and static friction plates to achieve braking;

[0008] The brake holding mechanism is used to hold the brake of the actuator or release the brake holding.

[0009] In some embodiments, the brake holding mechanism includes a bidirectional relay, a pawl and a ratchet, the ratchet is mounted on the camshaft and arranged coaxially with the cam, and a push rod is connected to the bidirectional relay; the push rod of the bidirectional relay extends to push the pawl to engage in the ratchet to achieve brake holding, or the push rod of the bidirectional relay retracts to disengage the pawl from the ratchet to release the brake holding.

[0010] In some embodiments, a ratchet key is installed between the ratchet and the camshaft, and the ratchet rotates synchronously with the cam.

[0011] In some embodiments, one end of the pawl is connected to a ratchet shaft, and the ratchet shaft is sleeved with a torsion spring for elastic reset of the pawl.

[0012] In some embodiments, the lower end of the lever is fixedly connected to the cam, and a cam key is installed between the cam and the camshaft.

[0013] In some embodiments, a transition pad is installed between the cam and the dynamic friction plate, and the cam protrusion on the cam squeezes the transition pad and the dynamic friction plate as the cam rotates.

[0014] In some embodiments, a nut lug is installed at the lower end of the nut, and the nut lug is connected to the lever through a lever shaft.

[0015] In some embodiments, the hole diameter of the nut lug is larger than the diameter of the lever shaft.

[0016] In some embodiments, a left brake housing and a right brake housing are also included, and both ends of the camshaft are connected to the left brake housing and the right brake housing respectively through bearings.

[0017] In some embodiments, the deceleration-torque-increasing ratio of the integrated lever-type electromechanical brake is adjusted by the lever length.

[0018] Compared with the prior art, the integrated lever type electronic mechanical brake of the present invention realizes deceleration and torque increase through the middle lever assembly, and then transmits the torque to the actuator, and realizes the brake holding function by the brake holding mechanism. The integrated lever type electronic mechanical brake has a simple structure, can decelerate and increase torque at a large speed ratio, has low requirements on the sealing and lubricity of the transmission pair, is easy to implement, and the brake holding and release are reliable and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the principle structure of the present invention;

[0021] Figure 2 It is a front view of the local structure of the present invention;

[0022] Figure 3 It is a right view of the local structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the partial connection structure between the nut and the lever of the present invention;

[0024] In the figure: 1, motor, 2, support bearing 1, 3, screw, 4, nut, 5, support bearing 2, 6, pawl, 7, ratchet, 8, two-way relay, 9, transition pad, 10, dynamic friction plate, 11, static friction plate, 12, brake right housing, 13, torsion spring, 14, cam protrusion, 15, bearing 1, 16, spacer sleeve 1, 17, ratchet key, 18, spacer sleeve 2, 19, cam, 20, cam key, 21, bearing 2, 22, brake left housing, 23, camshaft, 24, cam retaining ring, 25, ratchet shaft, 26, lever shaft, 27, nut support ear, 28, lever, 29, lever shaft retaining ring. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0026] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, an integrated lever-type electromechanical brake comprises a power source, a transmission mechanism, an actuator and a brake holding mechanism;

[0028] The power source mainly includes a motor 1 and its related connection control components;

[0029] The transmission mechanism includes a screw-nut pair and a lever assembly, wherein the screw-nut pair includes a screw 3 connected to a motor 1 and a nut 4 mounted on the screw 3, and support bearings 1 and 2 are mounted at both ends of the screw 3, respectively, to ensure that the screw 3 can rotate smoothly under the action of the motor 1; the lever assembly includes a lever 28 connected to the nut 4, a cam 19 mounted at the bottom end of the lever 28, and a camshaft 23 mounted at the center of the cam 19, the braking torque of the motor 1 is transmitted to the lever 28 through the screw-nut pair and drives the upper part of the lever 28 to move, and the upper part of the lever 28 moves to drive the cam 19 and the camshaft 23 connected to the lower part to rotate;

[0030] The actuator includes a dynamic friction plate 10 and a static friction plate 11. When the cam 19 rotates, the dynamic friction plate 10 is driven to cooperate with the static friction plate 11 to rub the brake disc between the dynamic and static friction plates to achieve braking.

[0031] The brake holding mechanism is used to hold the brake of the actuator or release the brake holding.

[0032] The present invention utilizes the lever principle to reduce the torque transmitted by the motor through the intermediate lever assembly to increase the torque, and then transmits the torque to the actuator, and realizes the brake holding function after power failure by the brake holding mechanism. The integrated lever type electronic mechanical brake has a simple structure, can reduce the torque with a large speed ratio, has low requirements on the sealing and lubricity of the transmission pair, is easy to implement, and the brake holding and release are reliable and simple.

[0033] In some embodiments, Figure 2 and Figure 3 As shown, the brake holding mechanism includes a two-way relay 8, a pawl 6 and a ratchet 7. The ratchet 7 is mounted on the camshaft 23 and arranged coaxially with the cam 19. A push rod is connected to the two-way relay 8. The push rod of the two-way relay 8 extends to push the pawl 6 to embed into the ratchet 7 to achieve brake holding, or the push rod of the two-way relay 8 retracts to disengage the pawl 6 from the ratchet 7 to achieve brake holding release. Specifically, when brake holding is required, the push rod of the two-way relay 8 is powered off and extended, pressing the pawl 6 to embed into the ratchet 7, so that the ratchet 7 cannot rotate. Since the ratchet 7 is connected and fixed to the camshaft 23, and the camshaft 23 is connected and fixed to the cam 19, the squeezing angle of the cam 19 can be kept unchanged by the ratchet 7, thereby achieving brake holding after power off; when brake holding is not required, the two-way relay 8 is powered on, and its push rod is powered on and retracted, and the pawl 6 embedded in the ratchet 7 is separated from the ratchet 7. At this time, the brake holding is released, and the cam 19 and the camshaft 23 can rotate synchronously, so that the squeezing angle of the cam 19 changes. Of course, the push rod of the bidirectional relay can be extended when the power is off and retracted when the power is on, or it can be retracted when the power is off and extended when the power is on.

[0034] In some embodiments, Figure 2 and Figure 3 As shown, a ratchet key 17 is installed between the ratchet 7 and the camshaft 23 to ensure that the ratchet 7 and the camshaft 23 are fixed together. At the same time, a cam key 20 is installed between the camshaft 23 and the cam 19. A cam retaining ring 24 is installed on one side of the cam 19 to ensure that the cam 19 and the camshaft 23 are fixed together, thereby making the ratchet 7 and the cam 19 fixed as a whole and can rotate synchronously. When the ratchet 7 of the brake holding mechanism is stationary, the cam 19 can also not rotate.

[0035] In some embodiments, Figure 3 As shown, the upper end of the pawl 6 is connected to a ratchet shaft 25, and the pawl 6 can rotate along the ratchet shaft 25. A torsion spring 13 is mounted on the ratchet shaft 25. One spring leg of the torsion spring 13 is connected to the right housing 12 of the brake, and the other spring leg is connected to the pawl 6. When the push rod of the two-way relay 8 is energized and retracted, the pawl 6 can quickly disengage from the ratchet 7 under the action of the torsion spring 13.

[0036] In some embodiments, Figure 3 As shown, the lower end of the lever 28 is fixedly connected to the cam 19, and when the upper part of the lever 28 moves, the lower cam 19 can be driven to rotate.

[0037] In some embodiments, Figure 2 As shown, a transition pad 9 is installed between the cam 19 and the dynamic friction plate 10, and the cam protrusion 14 on the cam 19 squeezes the transition pad 9 and the dynamic friction plate 10 as the cam 19 rotates, wherein the transition pad 9 can be used to adjust the wear and installation distance of the cam protrusion 14; the cam protrusion 14 squeezes the transition pad 9, so that the dynamic friction plate 10 cooperates with the static friction plate 11 to rub the brake disc between the dynamic and static friction plates to achieve braking, which is convenient for adjusting the extrusion gap and extrusion force.

[0038] In some embodiments, Figure 3 , Figure 4 As shown, a nut ear 27 is fixedly connected to the lower end of the nut 4, and the nut ear 27 is connected to the lever 28 through a lever shaft 26. The nut ear 27 can rotate along the lever shaft 26, and a lever shaft retaining ring 29 is installed at the end of the lever shaft 26 to prevent the lever 28 from axial shaking or displacement, thereby avoiding affecting the braking stability.

[0039] In some embodiments, Figure 4 As shown, in order to protect the screw nut pair from the oblique pulling force caused by the movement of the lever 28, the hole diameter of the nut lug 27 is larger than the diameter of the lever shaft 26.

[0040] In some embodiments, Figure 3As shown, it also includes a left brake housing 22 and a right brake housing 12. One end of the camshaft 23 is connected to the left brake housing 22 through a bearing 21, and the other end is connected to the right brake housing 12 through a bearing 15, ensuring that the camshaft 23 can rotate between the left brake housing 22 and the right brake housing 12, with a more stable structure and high safety.

[0041] In some embodiments, Figure 3 As shown, a spacer sleeve 18 is installed on the cam shaft 23 between the cam 19 and the ratchet 7, and a spacer sleeve 16 is installed on the cam shaft 23 between the ratchet 7 and the bearing 15, and the spacer sleeve is used for distance spacing.

[0042] In some embodiments, Figure 2 As shown, the deceleration-torque-increasing ratio of the integrated lever-type electronic mechanical brake is adjusted by the length of the lever 28. When in use, the specific length of the lever 28 is determined according to the braking torque and the installation space, thereby adjusting the deceleration-torque-increasing ratio, and a 5-fold torque-increasing ratio can be easily achieved.

[0043] The working process of the present invention is:

[0044] The braking torque of the motor 1 is transmitted to the upper part of the lever 28 through the lead screw 3 and the nut 4, so that the upper part of the lever 28 moves, driving the cam 19 and the camshaft 23 fixed to the lower part of the lever 28 to rotate along the bearings at both ends. The rotation of the cam 19 drives the cam protrusion 14 to squeeze the transition pad 9 and the dynamic friction plate 10 to move, and the dynamic friction plate 10 and the static friction plate 11 are used to rub the brake disc in the middle to achieve braking;

[0045] After power failure, the push rod of the two-way relay 8 extends out, pressing the pawl 6 to rotate around the ratchet shaft 25. At this time, the torsion spring 13 on the ratchet shaft 25 is compressed and subjected to torque; when the pawl 6 is embedded in the ratchet wheel 7, the ratchet wheel 7 cannot rotate, and the ratchet wheel 7, the cam shaft 23 and the cam 19 are synchronous rotating bodies, so the extrusion angle of the cam 19 remains unchanged, thereby achieving brake retention after power failure;

[0046] When the brake holding is not needed, the two-way relay 8 is energized, and its push rod is energized and retracted, and the pawl 6 embedded in the ratchet 7 is disengaged from the ratchet 7 under the elastic restoring force of the torsion spring 13, and the brake holding is released.

[0047] The integrated lever type electronic mechanical brake of the present invention realizes deceleration and torque increase through the middle lever assembly, and then transmits the torque to the actuator, and realizes the brake holding function by the brake holding mechanism. The integrated lever type electronic mechanical brake has a simple structure, can decelerate and increase torque with a large speed ratio, has low requirements on the sealing and lubricity of the transmission pair, is easy to implement, and has reliable and simple brake holding and release.

[0048] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. For those skilled in the art, without departing from the technical solution of the present invention, several modifications, improvements or equivalent substitutions can be made, which should all be included in the scope of the claims of the present invention. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation method and other records can be used to interpret the content of the claims.

Claims

1. An integrated lever type electromechanical brake, characterized in that: include: A power source is an electric motor (1); A transmission mechanism comprises a screw-nut pair and a lever assembly, wherein the screw-nut pair comprises a screw (3) connected to a motor (1) and a nut (4) mounted on the screw (3); the lever assembly comprises a lever (28) connected to the nut (4), a cam (19) mounted at the bottom end of the lever (28) and a camshaft (23) mounted at the center of the cam (19); the braking torque of the motor (1) is transmitted to the lever (28) through the screw-nut pair and drives the upper part of the lever (28) to move, thereby driving the cam (19) and the camshaft (23) connected to the lower part of the lever (28) to rotate; The actuator comprises a dynamic friction plate (10) and a static friction plate (11), wherein the cam (19) drives the dynamic friction plate (10) to cooperate with the static friction plate (11) to rub the brake disc between the dynamic and static friction plates to achieve braking; The brake holding mechanism is used to hold the brake of the actuator or release the brake holding.

2. The integrated lever-type electromechanical brake according to claim 1, characterized in that: The brake holding mechanism comprises a two-way relay (8), a pawl (6) and a ratchet (7); the ratchet (7) is mounted on a camshaft (23) and arranged coaxially with the cam (19); a push rod is connected to the two-way relay (8); the push rod of the two-way relay (8) extends to push the pawl (6) to embed into the ratchet (7) to achieve brake holding, or the push rod of the two-way relay (8) retracts to disengage the pawl (6) from the ratchet (7) to achieve brake holding release.

3. The integrated lever-type electromechanical brake according to claim 2, characterized in that: A ratchet key (17) is installed between the ratchet (7) and the cam shaft (23), and the ratchet (7) and the cam (19) rotate synchronously.

4. The integrated lever-type electromechanical brake according to claim 2, characterized in that: One end of the ratchet pawl (6) is connected to a ratchet shaft (25), and a torsion spring (13) for elastically resetting the ratchet pawl (6) is sleeved on the ratchet shaft (25).

5. The integrated lever-type electromechanical brake according to claim 1, characterized in that: The lower end of the lever (28) is fixedly connected to the cam (19), and a cam key (20) is installed between the cam (19) and the cam shaft (23).

6. The integrated lever-type electromechanical brake according to claim 1, characterized in that: A transition pad (9) is installed between the cam (19) and the dynamic friction plate (10), and a cam protrusion (14) on the cam (19) squeezes the transition pad (9) and the dynamic friction plate (10) as the cam (19) rotates.

7. The integrated lever-type electromechanical brake according to claim 1, characterized in that: A nut support ear (27) is installed at the lower end of the nut (4), and the nut support ear (27) is connected to the lever (28) via a lever shaft (26).

8. The integrated lever-type electromechanical brake according to claim 7, characterized in that: The hole diameter of the nut support ear (27) is larger than the diameter of the lever shaft (26).

9. The integrated lever-type electromechanical brake according to claim 1, characterized in that: It also includes a left brake housing (22) and a right brake housing (12), and the two ends of the camshaft (23) are respectively connected to the left brake housing (22) and the right brake housing (12) through bearings.

10. The integrated lever-type electromechanical brake according to claim 1, characterized in that: The deceleration and torque-increasing ratio of the integrated lever-type electronic mechanical brake is adjusted by the length of the lever (28).

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