Multi-mode electronic wedge brake with variable transmission ratio function

Abstract

The invention discloses a multi-mode electronic wedge brake with a variable transmission ratio function. The multi-mode electronic wedge brake comprises a shell, an execution motor, a speed reducing and torque increasing mechanism, a motion conversion mechanism and an execution mechanism, wherein the speed reducing and torque increasing mechanism comprises a two-stage planetary gear speed reducing mechanism and an electromagnetic control mechanism, a first-stage gear ring and a second-stage gear ring of a planetary gear are arranged in the same rotary shell capable of freely rotating around the axis of the rotary shell, and the electromagnetic control mechanism is installed in a shell groove chamber; the motion conversion mechanism is a disc connecting rod mechanism, a round hole in one end of a connecting rod is in clearance fit with a disc boss, and the other end of the connecting rod is provided with a rectangular groove and slidably connected to a wedge boss in the executing mechanism. The electronic wedge brake is L-shaped and small in axial size, has a parking function, and can prevent the wedge block from retreating and being stuck to the maximum extent by switching the working state of the electromagnetic control mechanism and changing the transmission ratio of the speed reducing and torque increasing mechanism according to the braking intention of a driver and the road condition on the premise that the rotating direction of the motor is not changed.

Description

Technical Field

[0001] This application relates to the technical field of vehicle wire-controlled braking, and particularly to a multi-mode electronic wedge brake with a variable transmission ratio function. Technical Background

[0002] Electronic Wedge Brake (EWB) is a new type of wire-controlled braking technology. This technology utilizes the self-servo principle of the wedge to greatly amplify the clamping force to achieve vehicle braking. Compared with the existing Electro-mechanical Brake (EMB), while EWB has most of the characteristics of EMB, it also has more additional advantages. First of all, relying on the self-servo effect, EWB greatly reduces the size of the motor and reducer, and the structure is more compact, which is conducive to the integrated layout of the chassis. Secondly, the simplification of the mechanical structure further reduces the response time and effectively shortens the braking distance. In addition, EWB is applicable to the current 12V power supply system of vehicles, while EMB requires a 42V power supply system to ensure its performance. Finally, EWB has better energy-saving performance, which is conducive to energy recovery during braking.

[0003] However, there are certain problems with existing EWB actuators. The retraction force required for the EWB actuator to release the brake is greater than the actuation force required during braking, and the speed reduction and torque increase mechanism of the existing EWB actuator cannot change the output torque according to the corresponding braking process or lacks corresponding protection measures, which may cause the wedge to be stuck between the inclined plane and the brake disc and unable to retract. In addition, existing EWB actuators often also have problems such as too large axial dimensions and lack of parking functions. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-mode electronic wedge brake with a variable transmission ratio function to solve some problems existing in the prior art. The electronic wedge brake in the present invention is L-shaped, with a compact structure, small axial dimensions, and has a parking function. Compared with the existing electronic wedge brake, the electronic wedge brake provided by the present invention can change the transmission ratio of the speed reduction and torque increase mechanism by switching the working state of the electromagnetic control mechanism according to the driver's braking intention and road conditions without changing the rotation direction of the motor. When the forward movement displacement of the wedge is equal to the maximum safe displacement and the rear end of the rectangular groove of the connecting rod contacts the rear end of the rectangular protrusion of the wedge, the actuator motor stops rotating. The speed reduction and torque increase mechanism and the motion conversion mechanism of the electronic wedge brake can avoid the wedge from getting stuck during retraction to the greatest extent.

[0005] To achieve the above object, the present invention provides the following solution:

[0006] The present invention provides a multi-mode electronic wedge brake with a variable transmission ratio function, which is characterized by comprising: a housing, an actuator motor, a speed reduction and torque increase mechanism, a motion conversion mechanism, and an actuator mechanism;

[0007] The housing includes an upper housing, a middle housing, and a lower housing; a closed chamber is formed between the housings;

[0008] The end flange of the actuating motor is connected to the upper housing;

[0009] The speed reduction and torque increase mechanism includes a two-stage planetary gear reduction mechanism and an electromagnetic control mechanism; the two-stage planetary gear reduction mechanism is disposed in the cavity of the middle housing, and its first ring gear and second ring gear are disposed in the same rotating housing that can freely rotate about its own axis; the electromagnetic control mechanism is installed in the corresponding groove chamber of the upper housing;

[0010] The motion conversion mechanism includes a central shaft, a disc, and a connecting rod; the central shaft is connected to the second planetary carrier of the two-stage planetary gear reduction mechanism by a flat key; a rectangular groove is provided at one end of the connecting rod;

[0011] The actuating mechanism includes a cage, a wedge block, a roller, a brake caliper body, a first friction lining, and a second friction lining; the cage is connected to the lower housing; a rectangular boss is provided on the upper surface of the wedge block and is slidably connected to the rectangular groove of the connecting rod; the brake caliper body is connected to the middle housing;

[0012] The electronic wedge brake can be controlled to switch modes to achieve different transmission ratios during operation on the basis of the unchanged rotation direction of the actuating motor, and the selection of the transmission ratio should ensure that the transmission ratio of the speed reduction and torque increase mechanism is greater when the brake is released than when the brake is applied.

[0013] Preferably, the housing is characterized in that:

[0014] The upper housing is a circular component, and a central hole matching a deep groove ball bearing is provided at its center, and its outer end surface is connected to the flange of the actuating motor; a flange is provided on the outer periphery of the inner end surface of the upper housing and is connected to the flange at the end of the middle housing; a plurality of arched outer limit blocks are provided on the inner end surface of the upper housing, and the outer diameter of the outer limit block is equal to the inner diameter of the cavity at the end of the middle housing; a circular convex platform is provided in the central hole on the inner end surface of the upper housing, and an inner limit block is provided on the side wall of the convex platform;

[0015] Between the outer limit block and the inner limit block, a plurality of outer grooves and a plurality of inner grooves are sequentially provided from the outside to the inside; between the outer limit block and the inner limit block, a plurality of outer round holes and a plurality of inner round holes are sequentially provided from the outside to the inside; the outer grooves and the outer round holes are arranged alternately, and the inner grooves and the inner round holes are arranged alternately;

[0016] The front end of the middle housing has three cylindrical cavities with gradually decreasing outer diameters and inner diameters, and the rear end has a U-shaped cavity; the first and second cylindrical cavities cooperate with the two-stage planetary gear reduction mechanism; the third cylindrical cavity cooperates with a tapered roller bearing, and the outer end of the tapered roller bearing relies on the shoulder of the third cylindrical cavity; the semi-circular outer diameter of the U-shaped cavity is the same as the outer diameter of the third cylindrical cavity, the two rectangular side walls are tangent to the semi-cylinder, and the other rectangular side wall opposite to the semi-cylinder is provided with a rectangular through hole.

[0017] The lower housing is a U-shaped component, with a shape consistent with the rear end of the middle housing and connected to the middle housing; a through hole is provided at the center of its semi-circle, and an annular boss is provided on its outer end face. The inner diameter of the annular boss is the same as the diameter of the through hole and cooperates with a deep groove ball bearing.

[0018] Preferably, when the actuator motor brakes and releases the brake of the vehicle, the rotation direction can remain the same to eliminate the response delay problem caused by the transmission clearances of the speed reduction and torque increase mechanism, the motion conversion mechanism, and the actuator mechanism; in addition, when the actuator motor needs to adjust the braking torque according to the braking instruction, it can also be achieved by rotating in the forward and reverse directions.

[0019] Preferably, the two-stage planetary gear reduction mechanism is characterized in that:

[0020] The rotating housing is integrally formed with its first-stage gear ring and second-stage gear ring; the outer diameter of the middle part of the rotating housing is larger than that of the end to form a flange. One end of the flange relies on the shoulder of the first cylindrical cavity of the middle housing, and the other end contacts the outer limit block of the upper housing; an annular plate is provided inside the rotating housing.

[0021] Its first-stage central gear is integrally formed with the motor shaft of the actuator motor;

[0022] Its first-stage planet gears and second-stage planet gears are provided with central holes, and planetary gear bearings are provided in the central holes.

[0023] One end face of its first-stage planet carrier and second-stage planet carrier is provided with a planetary gear shaft, and the inner end of the planetary gear bearing contacts the shaft shoulder of the planetary gear shaft.

[0024] The other end face of its first-stage planet carrier contacts the annular plate of the rotating housing, and its second-stage central gear is integrally formed with its first-stage planet carrier;

[0025] The other end face of its second-stage planet carrier is provided with a stepped first boss and second boss. The end of the first boss contacts the inner end of the tapered roller bearing, and the outer surface of the second boss is sleeved with the tapered roller bearing; a central hole is provided at the geometric center of its second-stage planet carrier, and a keyway is provided in the central hole.

[0026] Preferably, the electromagnetic control mechanism is characterized in that:

[0027] The electromagnetic control mechanism includes a rotating plate, an outer electromagnetic element, an inner electromagnetic element, an outer compression spring, an inner compression spring, an outer metal plate, and an inner metal plate;

[0028] The rotating plate is a circular component, and a plurality of mounting holes are provided on its inner end surface. The bottom surface of the mounting hole relies on the end surface of the planetary gear shaft of the first-stage planetary carrier; a circular boss is provided on the outer end surface of the rotating plate;

[0029] The outer electromagnetic element is installed in the outer groove of the upper housing, and the inner electromagnetic element is installed in the inner groove of the upper housing; the outer compression spring is installed in the outer circular hole of the upper housing, and the inner compression spring is installed in the inner circular hole of the upper housing;

[0030] A groove adapted to the outer limit block of the upper housing is provided on the outer periphery of the outer metal plate, and it can move back and forth along the central axis of the upper housing between the inner end surface of the upper housing and the front end surface of the rotating housing;

[0031] A groove adapted to the inner limit block of the upper housing is provided on the inner periphery of the inner metal plate, and it can move back and forth along the central axis of the upper housing between the inner end surface of the upper housing and the surface of the circular boss of the rotating plate.

[0032] Preferably, when the vehicle is about to brake, the electronic wedge brake enters the first mode; after receiving the command, the outer electromagnetic element is energized. Under its action, the outer metal plate overcomes the pressure of the outer compression spring and contacts the inner end surface of the upper housing, and the rotating housing can rotate freely; the inner electromagnetic element maintains a power-off state, and the inner metal plate contacts the surface of the circular boss of the rotating part under the action of the inner compression spring and locks it;

[0033] Preferably, when the vehicle is about to release the brake, the electronic wedge brake enters the second mode; the outer electromagnetic element maintains a power-off state, and the outer metal plate contacts the front end surface of the rotating housing under the action of the outer compression spring and locks it; after receiving the command, the inner electromagnetic element is energized. Under its action, the inner metal plate overcomes the pressure of the inner compression spring and contacts the inner end surface of the upper housing, and the rotating plate can rotate freely;

[0034] Preferably, for the first mode and the second mode of the electronic wedge brake, the rotation direction of the execution motor is the same, and the rotation direction of the second planetary carrier is opposite; the transmission ratio in the first mode is smaller than that in the second mode;

[0035] Preferably, when the vehicle is parked, the electronic wedge brake enters the third mode; both the outer electromagnetic element and the inner electromagnetic element maintain a power-off state; both the rotating housing and the rotating part are locked.

[0036] Preferably, the motion conversion mechanism is characterized in that:

[0037] The disc is provided with a central hole, the inner surface of the central hole is provided with an internal spline, which is connected to the external spline of the central shaft; the front end face of the disc relies on the shaft shoulder of the central shaft; the flange end face of the disc is provided with a cylindrical boss;

[0038] The other end of the connecting rod is provided with a circular hole, which is connected to the cylindrical boss, and a clearance fit is selected between the cylindrical boss and the circular hole.

[0039] Preferably, the actuator is characterized in that:

[0040] The bottom surface of the cage is a cuboid and is connected to the lower housing; one end of the upper surface of the cage is provided with a convex block, the end face of the convex block is provided with a plurality of V-shaped grooves with equal spacing; the cage is provided with corresponding round shafts adjacent to the V-shaped grooves, and the plane passing through the center line of the round shaft and the bottom line of the V-shaped groove is parallel to the side surface of the cage; the other end of the upper surface of the cage is provided with a rectangular boss parallel to the surface of the V-shaped groove;

[0041] One end face of the wedge block is provided with the same V-shaped groove as the end face of the convex block of the cage, and the center of the other end face is provided with a rectangular protrusion, which can freely pass through the rectangular through hole of the middle housing, and its length and width are slightly smaller than the rectangular through hole; the upper surface of the wedge block is provided with a transition block, the transition block is provided with a mating boss, and the mating boss is connected to the rectangular groove body of the connecting rod; the bottom surface of the wedge block is provided with a groove, the groove is parallel to the rectangular boss of the cage, and the wedge block can slide along the rectangular boss of the cage; the driving force or the retracting force received by the wedge block is always perpendicular to the side surface of the mating boss;

[0042] The center of the roller is provided with a central hole, and the central hole is connected to the round shaft of the cage; the surface of the roller is in tangential contact with the surface of the V-shaped groove of the cage and the surface of the V-shaped groove of the wedge block;

[0043] The rear end of the first friction lining is provided with a rectangular groove, which is connected to the rectangular protrusion of the wedge block.

[0044] Preferably, there is a certain gap between the front end of the rectangular groove body of the connecting rod and the front end of the mating boss of the wedge block. When the forward movement displacement of the wedge block is equal to the maximum safe displacement and the front end of the rectangular groove body of the connecting rod contacts the front end of the mating boss of the wedge block, the actuator motor stops rotating.

[0045] Preferably, a vehicle can be equipped with an electronic wedge brake having the above characteristics.

[0046] The present invention has achieved the following technical effects compared with the prior art:

[0047] 1. The electronic wedge brake provided by the present invention can automatically switch the working mode according to the driver's braking intention, and the transmission ratio of the deceleration and torque increase mechanism is greater than that during braking when the brake is released, which can avoid the wedge block from jamming to the greatest extent and ensure the braking performance of the brake.

[0048] 2. When the electronic wedge brake provided by the present invention performs mode switching, only the working state of the electromagnetic element needs to be changed, and the rotation direction of the actuator motor does not need to be changed, which shortens the braking response time and improves the service life of the actuator motor.

[0049] 3. The motion conversion mechanism of the electronic wedge brake provided by the present invention provides a supplementary design to avoid the wedge block from jamming.

[0050] 4. The electronic wedge brake provided by the present invention has a compact structure, a small axial dimension, has a parking function, a high integration degree, and is convenient for the coordinated layout of the entire chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a cross-sectional view of the electronic wedge brake provided by the present invention;

[0052] Figure 2 is Figure 1 a view of the enlarged partial structure;

[0053] Figure 3 is Figure 1 a view of the enlarged remaining structure;

[0054] Figure 4 is Figure 1 a three-dimensional view of the upper housing;

[0055] Figure 5.1 is Figure 1 a cross-sectional view of the middle housing;

[0056] Figure 5.2 is Figure 1 a three-dimensional view of the middle housing;

[0057] Figure 6 is Figure 1 a three-dimensional view of the rotating housing;

[0058] Figure 7 is Figure 1 a three-dimensional view of the first-stage planet carrier;

[0059] Figure 8 is Figure 1 a three-dimensional view of the second-stage planet carrier;

[0060] Figure 9 is Figure 1 a cross-sectional view of the rotating plate;

[0061] Figure 10.1 is Figure 1 the three-dimensional view of the inner metal plate;

[0062] Figure 10.2 is Figure 1 the three-dimensional view of the outer metal plate;

[0063] Figure 11 is Figure 1 the schematic diagram of the principle of the deceleration and torque-increasing mechanism;

[0064] Figure 12 is Figure 1 the three-dimensional view of the disc;

[0065] Figure 13 is Figure 1 the three-dimensional view of the connecting rod;

[0066] Figure 14 is Figure 1 the three-dimensional view of the cage;

[0067] Figure 15.1 is Figure 1 the three-dimensional view of the wedge block in one direction;

[0068] Figure 15.2 is Figure 1 the three-dimensional view of the wedge block in the other direction;

[0069] Figure 16 is Figure 1 the three-dimensional view of part of the actuator;

[0070] Figure 17.1 is Figure 1 the force diagram of the actuator at the start of braking;

[0071] Figure 17.2 is Figure 1 the force diagram of the actuator during the braking process;

[0072] Figure 18 is the three-dimensional view of the appearance of the electronic wedge brake provided by the present invention. Detailed implementation manners

[0073] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0074] The present invention provides a multi-mode electronic wedge brake with a variable transmission ratio function, as Figures 1 - 18As shown in the figure, it includes: a housing 100, an actuating motor 200, a speed reduction and torque increase mechanism 300, a motion conversion mechanism 400, and an actuating mechanism 500.

[0075] The housing 100 includes an upper housing 101, a middle housing 102, and a lower housing 103;

[0076] The actuating motor 200 includes the actuating motor itself 201 and a motor shaft 202;

[0077] The speed reduction and torque increase mechanism 300 includes a two-stage planetary gear reduction mechanism 310 and an electromagnetic control mechanism 320; the two-stage planetary gear reduction mechanism 310 includes a rotating housing 311, a first-stage central gear 312, first-stage planetary gears 313, a first-stage ring gear 314, a first-stage planetary carrier 315, a second-stage central gear 316, second-stage planetary gears 317, a second-stage ring gear 318, a second-stage planetary carrier 319, and planetary gear bearings 3110; the electromagnetic control mechanism 320 includes a rotating plate 321, an outer electromagnetic element 322, an inner electromagnetic element 323, an outer compression spring 324, an inner compression spring 325, an outer metal plate 326, and an inner metal plate 327;

[0078] The motion conversion mechanism 400 includes a central shaft 401, a disk 402, and a connecting rod 403;

[0079] The actuating mechanism 500 includes a cage 501, a wedge 502, rollers 503, a brake caliper body 504, a first friction lining 505, and a second friction lining 506.

[0080] Furthermore, the characteristics of the housing 100 include:

[0081] The upper housing 101 is a circular component, with a central hole 1011 provided at its center for mating with a deep groove ball bearing 104, and its outer end face is connected to the flange portion of the actuating motor 201; an outer flange 1012 is provided on the outer periphery of the inner end face of the upper housing 101 and is connected to the flange 1021 at the end of the middle housing; several arched outer limit blocks 1013 are provided on the inner end face of the upper housing, and their outer diameter is equal to the inner diameter of the first cylindrical cavity 1021 of the middle housing; a ring-shaped boss 1014 is provided in the central hole 1011 on the inner end face of the upper housing, and an inner limit block 1015 is provided on its side wall;

[0082] Between the outer limit block 1013 and the inner limit block 1014, several outer grooves 1016 and several inner grooves 1017 are provided in sequence from the outside to the inside; between the outer limit block 1013 and the inner limit block 1014, several outer round holes 1018 and several inner round holes 1019 are provided in sequence from the outside to the inside; the outer grooves 1016 and the outer round holes 1018 are arranged alternately, and the inner grooves 1017 and the inner round holes 1019 are arranged alternately;

[0083] The front end of the middle housing 102 is a cylindrical cavity with three segments of gradually decreasing outer diameter and inner diameter, and the rear end is a U-shaped cavity; the first cylindrical cavity 1021, the second cylindrical cavity 1022 cooperate with the two-stage planetary gear reduction mechanism 210, and the third cylindrical cavity 1023 cooperates with the tapered roller bearing 105. The outer end of the tapered roller bearing 105 relies on the shoulder of the third cylindrical cavity 1023; the semi-circular outer diameter of the U-shaped cavity 1024 is the same as the outer diameter of the third cylindrical cavity 1023. The two rectangular side walls are tangent to the semi-cylinder, and the other rectangular side wall opposite to the semi-cylinder is provided with a rectangular through hole 1025;

[0084] The lower housing 103 is a U-shaped component, with a shape consistent with the rear end of the middle housing 102 and is connected to the middle housing 102; a through hole is provided at the center of its semi-circle, and an annular boss is provided on its outer end face. The inner diameter of the annular boss is the same as the diameter of the through hole and cooperates with the deep groove ball bearing 106.

[0085] In one embodiment, threaded holes are provided on the outer end face of the upper housing 101 and are connected to the flange part of the actuator motor 201 by screws; threaded holes are provided on the flange 1012 of the upper housing and the flange 1021 of the middle housing, and the two are connected by bolts; threaded holes are provided at the rear end of the middle housing 102, and through holes are provided on the outer periphery of the lower housing 103, and the two are connected by screws; in another embodiment, the end of the middle housing 102 is provided with an outer flange or an inner flange and is connected to the lower housing by bolts;

[0086] In one embodiment, two rectangular side walls of the U-shaped cavity 1024 of the middle housing are provided with lugs 1026, and central holes are provided on the lugs 1026, which can cooperate with sliding pins (not shown in the figure); the entire electronic wedge brake can move back and forth along the sliding pins towards the brake disc;

[0087] In one embodiment, the inner end of the deep groove ball bearing 104 relies on the shoulder of the motor shaft 202, and the inner end of the deep groove ball bearing 106 relies on the shoulder of the central shaft 401;

[0088] In one embodiment, the outer end of the deep groove ball bearing 104 contacts the upper housing end cover 107, and the upper housing end cover 107 is connected to the upper housing 101 by screws; the outer end of the deep groove ball bearing 106 contacts the lower housing end cover 108, and the lower housing end cover 108 is connected to the lower housing 103 by screws;

[0089] In one embodiment, the number of outer limit blocks 1013 is 8, and the number of inner limit blocks 1015 is 4; in some other embodiments, the number can be determined according to specific situations;

[0090] In one embodiment, the outer groove 1016 and the inner groove 1017 are arc-shaped; in some other embodiments, the outer groove 1016 and the inner groove 1017 are arched or rectangular;

[0091] In one embodiment, the number of outer groove bodies 1016 and outer round holes 1018 is 4, and the number of inner groove bodies 1017 and inner round holes 1019 is 2; in some other embodiments, the number can be determined according to specific circumstances.

[0092] Furthermore, when the actuating motor 201 brakes and releases the brake of the vehicle, the rotation direction can remain the same to eliminate the problem of slow response caused by the transmission clearances of the speed increasing and torque increasing mechanism 300, the motion conversion mechanism 400, and the actuating mechanism 500; when the actuating motor 201 needs to adjust the braking torque according to a braking instruction, it can also be achieved by rotating in the forward and reverse directions.

[0093] In one embodiment, the actuating motor 201 is a permanent magnet synchronous motor.

[0094] Furthermore, the characteristics of the two-stage planetary gear reduction mechanism 310 include:

[0095] The rotating housing 311 is integrally formed with the first-stage gear ring 314 and the second-stage gear ring 318; the outer diameter of the middle part of the rotating housing 311 is larger than that of the end part to form a flange 3111. One end of the flange 3111 relies on the shoulder of the first cylindrical cavity 1021 of the middle housing, and the other end contacts the outer limit block 1013 of the upper housing; an annular plate 3112 is provided inside the rotating housing 311;

[0096] The first-stage central gear 312 is integrally formed with the motor shaft 202;

[0097] The first-stage planet gears 313 and the second-stage planet gears 317 are provided with central holes, and planet gear bearings 3110 are provided in the central holes;

[0098] One end surfaces of the first-stage planet carrier 315 and the second-stage planet carrier 319 are provided with planet gear shafts 3151 and 3191, and the inner ends of the planet gear bearings 3110 contact the shoulders of the planet gear shafts 3151 and 3191;

[0099] The other end surface of the first-stage planet carrier 315 contacts the annular plate 3112 of the rotating housing, and the second-stage central gear 316 is integrally formed with the first-stage planet carrier 315;

[0100] The other end surface of the second-stage planet carrier 319 is provided with a stepped first boss 3192 and a second boss 3193. The end of the first boss 3192 contacts the inner end of the tapered roller bearing 105, and the outer surface of the second boss 3193 is sleeved with the tapered roller bearing 105; a central hole is provided in the geometric center of the second-stage planet carrier 315, and a keyway 3194 is provided in the central hole.

[0101] In one embodiment, a certain gap is left on both sides of the first-stage gear ring 314 and the second-stage gear ring 318, and they do not directly contact the rotating housing 311;

[0102] In one embodiment, the front end face 3113 of the rotating housing 311 has a relatively high coefficient of friction;

[0103] In one embodiment, the rotating housing 311 is formed by connecting a front end, a middle end, and a rear end; flanges or flanges are provided at the front end and the rear end, and are connected to the middle end by screws;

[0104] In one embodiment, the number of the first-stage planet gears 313 and the second-stage planet gears 317 is 3;

[0105] In some embodiments, the planetary gear bearing 3110 is a deep groove ball bearing or a cylindrical roller bearing.

[0106] Furthermore, the characteristics of the electromagnetic control mechanism 320 include:

[0107] The rotating plate 321 is a circular component, and a plurality of mounting holes 3211 are provided on its inner end face. The bottom surface of the mounting hole 3211 abuts against the end face of the end of the first-stage planet carrier planet gear shaft 3151; a circular boss 3212 is provided on the outer end face of the rotating plate 321;

[0108] The outer electromagnetic element 322 is installed in the outer groove body 1016 of the upper housing, and the inner electromagnetic element 323 is installed in the inner groove body 1017 of the upper housing; the outer compression spring 324 is installed in the outer circular hole 1018 of the upper housing, and the inner compression spring 425 is installed in the inner circular hole 1019 of the upper housing;

[0109] The outer metal plate 326 is provided with a groove adapted to the outer limiting block 1013 of the upper housing on its outer periphery, and can move back and forth along the central axis direction of the upper housing 101 between the inner end face of the upper housing 101 and the front end face 3113 of the rotating housing;

[0110] The inner metal plate 327 is provided with a groove adapted to the inner limiting block 1015 of the upper housing on its inner periphery, and can move back and forth along the central axis direction of the upper housing 101 between the inner end face of the upper housing 101 and the surface of the circular boss 3212 of the rotating plate.

[0111] In one embodiment, the outer electromagnetic element 322 and the inner electromagnetic element 323 are electromagnets;

[0112] In one embodiment, the outer electromagnetic element 322 has the same shape as the outer groove body 1016 of the upper housing, and the inner electromagnetic element 323 has the same shape as the inner groove body 1017 of the upper housing;

[0113] In one embodiment, the surface of the circular boss 3212 of the rotating plate has a relatively high coefficient of friction;

[0114] In one embodiment, the two ends of the outer compression spring 324 and the inner compression spring 425 are polished flat;

[0115] In one embodiment, the number of grooves of the outer metal plate 326 is consistent with the number of outer limit blocks 1013, and the number of grooves of the inner metal plate 327 is consistent with the number of inner limit blocks 1015;

[0116] In one embodiment, a friction material is coated on one end of the outer metal plate 326 facing the rotating housing 311, and a friction material is coated on one end of the inner metal plate 327 facing the rotating plate 321.

[0117] Furthermore, when the vehicle is about to brake, the electronic wedge brake enters the first mode; after receiving the instruction, the outer electromagnetic element 322 is energized. Under its action, the outer metal plate 326 overcomes the pressure of the outer compression spring 324 and contacts the inner end face of the upper housing 101, and the rotating housing 311 can rotate freely; the inner electromagnetic element 323 maintains a power-off state, and the inner metal plate 327 contacts the surface of the annular boss 3212 of the rotating part under the action of the inner compression spring 325 and locks it;

[0118] Furthermore, when the vehicle is about to release the brake, the electronic wedge brake enters the second mode; the outer electromagnetic element 322 maintains a power-off state, and the outer metal plate 326 contacts the front end face 3113 of the rotating housing under the action of the outer compression spring 324 and locks it; after receiving the instruction, the inner electromagnetic element 323 is energized. Under its action, the inner metal plate 327 overcomes the pressure of the inner compression spring 325 and contacts the inner end face of the upper housing 101, and the rotating plate 321 can rotate freely;

[0119] Furthermore, for the first mode and the second mode of the electronic wedge brake, the rotation direction of the actuating motor 201 is the same, and the rotation direction of the second planet carrier 319 is opposite; the transmission ratio of the speed reduction and torque increase mechanism 310 in the first mode is less than that in the second mode;

[0120] Furthermore, when the vehicle is parked, the electronic wedge brake enters the third mode; both the outer electromagnetic element 322 and the inner electromagnetic element 323 maintain a power-off state; both the rotating housing 311 and the rotating part 321 are locked.

[0121] In one embodiment, the number of teeth of the first-stage sun gear 312 is z a , the number of teeth of the first-stage ring gear 314 is z b , the number of teeth of the second-stage sun gear 316 is z A , the number of teeth of the second-stage ring gear 318 is z B ;

[0122] In the first mode, the transmission ratio i1 of the speed reduction and torque increase mechanism 310 is:

[0123]

[0124] wherein, the negative sign indicates that the rotation direction of the actuating motor 201 is opposite to that of the second planet carrier 319;

[0125] In the second mode, the transmission ratio i2 of the speed reduction and torque increase mechanism 310 is:

[0126]

[0127] Among them, the rotation directions of the actuator motor 201 and the secondary planet carrier 319 are the same;

[0128] In one embodiment, all gears have the same module.

[0129] Furthermore, the characteristics of the motion conversion mechanism 400 include:

[0130] The center shaft 401 and the secondary planet carrier 319 are connected by a flat key;

[0131] The disc 402 is provided with a central hole, and the inner surface of the central hole is provided with an internal spline 4021, which is connected to the external spline of the center shaft 401; the front end face 4022 of the disc relies on the shoulder of the center shaft 401; the flange end face of the disc is provided with a cylindrical boss 4023;

[0132] One end of the connecting rod 403 is provided with a rectangular groove 4031; the other end of the connecting rod is provided with a round hole 4032, which is connected to the cylindrical boss 4023, and a clearance fit is selected between the cylindrical boss 4023 and the round hole 4032.

[0133] Furthermore, the characteristics of the actuator 500 include:

[0134] The bottom surface of the cage 501 is a cuboid and is connected to the lower housing 103; one end of the upper surface of the cage 501 is provided with a convex block 5011, and the end face of the convex block 5011 is provided with a number of V-shaped grooves 5012 with equal spacing; near the V-shaped grooves 5012 of the cage 501, there are corresponding round shafts 5013 one by one, and the plane passing through the center line of the round shaft 5013 and the bottom line of the V-shaped groove 5012 is parallel to the side surface 5014 of the cage; the other end of the upper surface of the cage 501 is provided with a rectangular boss 5015 parallel to the surface of the V-shaped groove 5012;

[0135] One end face of the wedge block 502 is provided with a V-shaped groove 5021 identical to the end face of the convex block 5011 of the cage, and the center of the other end face is provided with a rectangular protrusion 5022, which can freely pass through the rectangular through hole 1025 of the middle housing, and its length and width are slightly smaller than the rectangular through hole 1025; the upper surface of the wedge block 502 is provided with a transition block 5023, and the transition block 5023 is provided with a mating boss 5024, which is connected to the rectangular groove 4031 of the connecting rod; the bottom surface of the wedge block 502 is provided with a groove 5025, which is parallel to the rectangular boss 5015, and the wedge block 502 can slide along the rectangular boss 5015; the driving force or the retracting force received by the wedge block 502 is always perpendicular to the side surface of the mating boss 5024;

[0136] The center of the roller 503 is provided with a central hole, and the central hole is connected to the cage round shaft 5013; the surface of the roller 503 is in tangential contact with the surface of the cage V-groove 5012 and the surface of the wedge V-groove 5021;

[0137] At the rear end of the first friction lining 505, there is a rectangular groove, which is connected to the rectangular protrusion 5015 of the wedge.

[0138] In one embodiment, threaded holes are provided on both sides of the cage, and it is connected to the lower housing 103 by bolts;

[0139] In one embodiment, the number of V-grooves is 4; in some other embodiments, the number can be determined according to the actual situation;

[0140] In one embodiment, the angle formed by the surface of the V-groove and the rear end face of the convex block, that is, the wedge angle, is 20°; in some other embodiments, the size of the wedge angle can be determined according to the actual situation;

[0141] In one embodiment, the width of the rectangular groove body 4031 is equal to the width of the mating boss 5024;

[0142] In one embodiment, in the initial state, the rear end of the rectangular groove body 4031 contacts the rear end of the mating boss 5024;

[0143] In one embodiment, a clearance fit is selected between the cage round shaft 5013 and the central hole of the roller 503;

[0144] In one embodiment, the surfaces of the V-groove 5012, the V-groove 5021, and the surface of the roller 503 have a small coefficient of friction;

[0145] In one embodiment, the length of the rectangular boss 5015 is greater than the length of the groove 5025, and the width is equal to the width of the groove 5025.

[0146] In one embodiment, a separation spring 507 is provided between the two friction linings 505 and 506.

[0147] Furthermore, there is a certain clearance between the front end of the connecting rod rectangular groove body 4031 and the front end of the wedge mating boss 5024. When the forward movement displacement of the wedge 502 is equal to the maximum safe displacement and the front end of the rectangular groove body 4031 contacts the front end of the mating boss 5024, the actuating motor 201 stops rotating.

[0148] In one embodiment, the upper housing 101, the middle housing 102, the lower housing 103, the actuating motor 201, the motor shaft 202, the rotating housing 311, the first central gear 312, the first gear ring 314, the first planetary carrier 315, the second central gear 316, the second gear ring 318, the second planetary carrier 319, the central shaft 401, and the disc 402 have the same center line.

[0149] Further, a vehicle may be equipped with an electronic wedge brake having the above characteristics.

[0150] The principle of the electronic wedge brake for vehicle driving braking is as follows:

[0151] After the brake control unit receives the driver's intention, it issues an instruction to the electronic wedge brake, and the electronic wedge brake enters the first mode. After receiving the instruction, the outer electromagnetic element 322 is energized. Under its action, the outer metal plate 326 overcomes the pressure of the outer compression spring 324 and contacts the inner end face of the upper housing 101; the inner electromagnetic element 323 remains de-energized, and the inner metal plate 327 contacts the surface of the annular boss 3212 of the rotating member under the action of the inner compression spring 325 and locks it. At this time, the first-stage gear ring 314 and the second-stage gear ring 318 can rotate freely with the rotating housing 311, and the first-stage planet gear 313 can only rotate by itself and cannot revolve around the first-stage central gear 312.

[0152] Furthermore, the actuator motor 201 rotates and outputs a braking torque, and the braking torque is amplified by the speed reduction and torque increase mechanism 310 with a transmission ratio of i1. The central shaft 401 rotates with the second-stage planet carrier 319 under the action of a flat key, the disk 402 rotates with the central shaft 401 under the action of a spline, and the wedge block 502 slides along the rectangular boss 5015 under the action of the connecting rod 403 and pushes the first friction lining 505 to press against the brake disc. The entire electronic wedge brake moves backward along the sliding pin under the reaction force of the brake disc on the first friction lining 505, and the second friction lining 506 also presses against the brake disc, realizing the driving braking of the vehicle.

[0153] The principle of the electronic wedge brake for releasing vehicle braking is as follows:

[0154] After the brake control unit receives the driver's intention, it issues an instruction to the electronic wedge brake, and the electronic wedge brake enters the second mode. The outer electromagnetic element 322 remains de-energized, and the outer metal plate 326 contacts the front end face 3113 of the rotating housing under the action of the outer compression spring 324 and locks it; the inner electromagnetic element 323 is energized after receiving the instruction, and the inner metal plate 327 overcomes the pressure of the inner compression spring 325 under its action and contacts the inner end face of the upper housing 101. At this time, the first-stage gear ring 314 and the second-stage gear ring 318 are locked, and the first-stage planet gear 313 can both rotate by itself and revolve around the first-stage central gear 312.

[0155] Furthermore, the motor 201 rotates in the same direction and outputs a torque, which is amplified by the speed reduction and torque increasing mechanism 310 with a transmission ratio of i2. The central shaft 401 rotates with the secondary planet carrier 319 under the action of a flat key, the disk 402 rotates with the central shaft 401 under the action of a spline, and the wedge block 502 slides along the rectangular boss 5015 and pushes the first friction lining 505 away from the brake disc under the action of the connecting rod 403. The second friction lining 506 also moves away from the brake disc under the action of the separation spring 507, and the electronic wedge brake resets along the slide pin to release the vehicle brake.

[0156] The principle of the electronic wedge brake for realizing vehicle parking brake is as follows:

[0157] After receiving the driver's intention, the brake control unit sends an instruction to the electronic wedge brake, and the electronic wedge brake enters the third mode. Both the outer electromagnetic element 322 and the inner electromagnetic element 323 maintain a power-off state. At this time, the first-stage ring gear 314 and the second-stage ring gear 318 are completely locked, and the first-stage planet gear 313 cannot revolve around the first-stage central gear 312, that is, the power cannot be output from the secondary planet carrier 319, and the braking torque is maintained.

[0158] It should be noted that the above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, several simple deductions, deformations or substitutions can also be made based on the idea of the present invention.

Claims

1. A multi-mode electronic wedge brake with variable transmission ratio function, characterized in that, The electronic wedge brake includes: a housing, an actuating motor, a speed reduction and torque increase mechanism, a motion conversion mechanism, and an actuating mechanism; The housing includes an upper housing, a middle housing, and a lower housing; a closed chamber is formed between the housings; The end flange of the actuating motor is connected to the upper housing; The speed reduction and torque increase mechanism includes a two-stage planetary gear reduction mechanism and an electromagnetic control mechanism; the two-stage planetary gear reduction mechanism is placed in the cavity of the middle housing, and its first-stage gear ring and second-stage gear ring are placed in the same rotating housing that can freely rotate around its own axis; the electromagnetic control mechanism is installed in the corresponding groove chamber of the upper housing; The motion conversion mechanism includes a central shaft, a disc, and a connecting rod; the central shaft is connected to the second-stage planetary carrier of the two-stage planetary gear reduction mechanism by a flat key; a rectangular groove is provided at one end of the connecting rod; The actuating mechanism includes a cage, a wedge block, a roller, a brake caliper body, a first friction lining, and a second friction lining; the cage is connected to the lower housing; a rectangular boss is provided on the upper surface of the wedge block and is slidably connected to the rectangular groove of the connecting rod; the brake caliper body is connected to the middle housing; The electronic wedge brake can be controlled to switch modes to achieve different transmission ratio operations on the basis of the unchanged rotation direction of the actuating motor. The selection of the transmission ratio should ensure that the transmission ratio of the speed reduction and torque increase mechanism is greater when the brake is released than when the brake is applied.

2. The electronic wedge brake according to claim 1, wherein The housing is characterized in that: The upper housing is a circular component, with a central hole that matches a deep groove ball bearing at its center, and its outer end face is connected to the flange of the actuating motor; a flange is provided on the outer periphery of the inner end face of the upper housing and is connected to the flange at the end of the middle housing; several arched outer limit blocks are provided on the inner end face of the upper housing, and the outer diameter of the outer limit blocks is equal to the inner diameter of the cavity at the end of the middle housing; a circular convex platform is provided in the central hole on the inner end face of the upper housing, and an inner limit block is provided on the side wall of the convex platform; Between the outer limit block and the inner limit block, several outer groove bodies and several inner groove bodies are provided in sequence from the outside to the inside; between the outer limit block and the inner limit block, several outer round holes and several inner round holes are provided in sequence from the outside to the inside; the outer groove bodies and the outer round holes are arranged alternately, and the inner groove bodies and the inner round holes are arranged alternately; The front end of the middle housing is a cylindrical cavity with three sections of outer diameter and inner diameter decreasing in sequence, and the rear end is a U-shaped cavity; the first and second sections of the cylindrical cavity are matched with the two-stage planetary gear reduction mechanism; the third section of the cylindrical cavity is matched with a tapered roller bearing, and the outer end of the tapered roller bearing relies on the shoulder of the third section of the cylindrical cavity; the outer diameter of the semi-circle of the U-shaped cavity is the same as the outer diameter of the third section of the cylindrical cavity, the two rectangular side walls are tangent to the semi-cylinder, and a rectangular through hole is provided on the other rectangular side wall opposite to the semi-cylinder; The lower housing is a U-shaped component, with a shape consistent with the rear end of the middle housing and is connected to the middle housing; a through hole is provided at the center of its semi-circle, and an annular convex platform is provided on its outer end face. The inner diameter of the annular convex platform is the same as the diameter of the through hole and is matched with a deep groove ball bearing.

3. The electronic wedge brake according to claim 1, characterized in that: When the execution motor brakes and releases the brake of the vehicle, the rotation direction can remain the same to eliminate the problem of slow response caused by the transmission clearances of the speed reduction and torque increase mechanism, the motion conversion mechanism, and the execution mechanism; in addition, when the execution motor needs to adjust the braking torque according to the braking instruction, it can also be achieved by rotating in the forward and reverse directions.

4. The electronic wedge brake according to claim 1, wherein The two-stage planetary gear reduction mechanism is characterized in that: The rotating housing is integrally formed with its first-stage ring gear and second-stage ring gear; the outer diameter of the middle part of the rotating housing is larger than that of the end part to form a flange, one end of the flange relies on the shoulder of the first cylindrical cavity of the middle housing, and the other end contacts the outer limit block of the upper housing; an annular plate is arranged inside the rotating housing; Its first-stage central gear is integrally arranged with the motor shaft of the execution motor; Its first-stage planet gears and second-stage planet gears are provided with central holes, and planet gear bearings are arranged in the central holes; One end surfaces of its first-stage planet carrier and second-stage planet carrier are provided with planet gear shafts, and the inner ends of the planet gear bearings contact the shaft shoulders of the planet gear shafts; The other end surface of its first-stage planet carrier contacts the annular plate of the rotating housing, and its second-stage central gear is integrally arranged with its first-stage planet carrier; The other end surface of its second-stage planet carrier is provided with a stepped first boss and second boss, the end of the first boss contacts the inner end of the tapered roller bearing, and the outer surface of the second boss is sleeved with the tapered roller bearing; a central hole is arranged at the geometric center of its second-stage planet carrier, and a key groove is arranged in the central hole.

5. The electronic wedge brake according to claim 2, characterized in that, The electromagnetic control mechanism is characterized in that: The electromagnetic control mechanism includes a rotating plate, an outer electromagnetic element, an inner electromagnetic element, an outer compression spring, an inner compression spring, an outer metal plate, and an inner metal plate; The rotating plate is a circular component, and a plurality of mounting holes are arranged on its inner end surface, and the bottom surfaces of the mounting holes rely on the end surfaces of the ends of the planet gear shafts of the first-stage planet carrier; an annular boss is arranged on the outer end surface of the rotating plate; The outer electromagnetic element is installed in the outer groove body of the upper housing, and the inner electromagnetic element is installed in the inner groove body of the upper housing; the outer compression spring is installed in the outer round hole of the upper housing, and the inner compression spring is installed in the inner round hole of the upper housing; The outer circumference of the outer metal plate is provided with a groove adapted to the outer limit block of the upper housing, and it can move back and forth along the central axis of the upper housing between the inner end surface of the upper housing and the front end surface of the rotating housing; The inner circumference of the inner metal plate is provided with a groove adapted to the inner limit block of the upper housing, and it can move back and forth along the central axis of the upper housing between the inner end surface of the upper housing and the surface of the annular boss of the rotating plate.

6. The electronic wedge brake according to claim 5, characterized in that, The modes include: When the vehicle is about to brake, the electronic wedge brake enters the first mode; after receiving the instruction, the outer electromagnetic element is energized, and under its action, the outer metal plate overcomes the pressure of the outer compression spring and contacts the inner end surface of the upper housing, and the rotating housing can rotate freely; the inner electromagnetic element maintains a power-off state, and under the action of the inner compression spring, the inner metal plate contacts the surface of the annular boss of the rotating part and locks it; When the vehicle is about to release the brake, the electronic wedge brake enters the second mode; the outer electromagnetic element remains de-energized, and under the action of the outer compression spring, the outer metal plate contacts the front end face of the rotating housing and locks it; after receiving the instruction, the inner electromagnetic element is energized, and under its action, the inner metal plate overcomes the pressure of the inner compression spring and contacts the inner end face of the upper housing, and the rotating plate can rotate freely; For the first mode and the second mode of the electronic wedge brake, the rotation direction of the actuator motor is the same, and the rotation direction of the second planetary carrier is opposite; the transmission ratio of the speed reduction and torque increase mechanism in the first mode is less than that in the second mode; When the vehicle is parked, the electronic wedge brake enters the third mode; both the outer electromagnetic element and the inner electromagnetic element remain de-energized; the rotating housing and the rotating part are both locked.

7. The electronic wedge brake according to claim 1, characterized in that, The motion conversion mechanism is characterized in that: The disc is provided with a central hole, and the inner surface of the central hole is provided with an internal spline, which is connected to the external spline of the central shaft; the front end face of the disc relies on the shaft shoulder of the central shaft; the flange end face of the disc is provided with a cylindrical boss; The other end of the connecting rod is provided with a circular hole, which is connected to the cylindrical boss, and a clearance fit is selected between the cylindrical boss and the circular hole.

8. The electronic wedge brake according to claim 2, characterized in that, The actuator mechanism is characterized in that: The bottom surface of the cage is a cuboid and is connected to the lower housing; one end of the upper surface of the cage is provided with a convex block, and the end face of the convex block is provided with a number of V-shaped grooves with equal spacing; near the V-shaped grooves of the cage, there are corresponding round shafts one by one, and the plane passing through the center line of the round shaft and the bottom line of the V-shaped groove is parallel to the side surface of the cage; the other end of the upper surface of the cage is provided with a rectangular boss parallel to the surface of the V-shaped groove; One end face of the wedge block is provided with the same V-shaped groove as the end face of the convex block of the cage, and the center of the other end face is provided with a rectangular protrusion, which can freely pass through the rectangular through hole of the middle housing, and its length and width are slightly smaller than the rectangular through hole; the upper surface of the wedge block is provided with a transition block, and the transition block is provided with a mating boss, which is connected to the rectangular groove body of the connecting rod; the bottom surface of the wedge block is provided with a groove, which is parallel to the rectangular boss of the cage, and the wedge block can slide along the rectangular boss of the cage; the driving force or the retracting force received by the wedge block is always perpendicular to the side surface of the mating boss; The center of the roller is provided with a central hole, which is connected to the round shaft of the cage; the surface of the roller is in tangential contact with the surface of the V-shaped groove of the cage and the surface of the V-shaped groove of the wedge block; The rear end of the first friction lining is provided with a rectangular groove, which is connected to the rectangular protrusion of the wedge block.

9. The electronic wedge brake according to claim 8, characterized in that: A certain gap is left between the front end of the rectangular groove body of the connecting rod and the front end of the mating boss of the wedge block. When the forward movement displacement of the wedge block is equal to the maximum safe displacement and the front end of the rectangular groove body of the connecting rod contacts the front end of the mating boss of the wedge block, the actuator motor stops rotating.

10. A vehicle, characterized in that: The vehicle is equipped with the electronic wedge brake as described in claims 1-9.

Images