Driving and parking braking coupled electronic mechanical braking system

Abstract

The utility model belongs to an electronic mechanical braking system in the technical field of vehicles, and discloses a driving and parking braking coupled electronic mechanical braking system, which is characterized in that a driving braking motor and a parking braking motor of the system are arranged in parallel, and a third-stage gear of a triple gear train and a parking second-stage speed reduction worm gear are jointly assembled on a connecting shaft; the torque is amplified and output through the planetary gear train, and the planetary gear train comprises a gear ring, a sun gear, a planet gear and a planet carrier. A sun gear is arranged at the other end of the third-stage gear and meshed with a planet gear, the planet gear is meshed with a gear ring, the gear ring is arranged in a groove of the third-stage gear, and the planet gear drives a planet carrier to rotate to output power. The braking torque of the traveling braking system and the braking torque of the parking braking system are mutually coupled, the two systems can share the power output shaft of the planetary gear train, the installation space of the gear train is reduced, and the efficiency and the reliability of the braking system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile electronic mechanical parking brake, specifically an electronic mechanical braking system integrating service brake and parking brake, which realizes redundant braking function through a coupling structure of a three-gear train and a worm gear train. BACKGROUND

[0002] The electronic mechanical braking system cancels the traditional hydraulic transmission braking force mode, directly drives the brake through the motor to realize clamping of the vehicle brake disc or brake drum, thereby achieving the purpose of braking. Its main advantages are short braking response time, high control precision, energy saving and environmental protection, and it can realize more efficient energy recovery and more excellent braking performance.

[0003] The electronic mechanical braking system includes two components of service brake and parking brake. In order to adapt to different scene applications of passenger cars, commercial vehicles or multipurpose vehicles, the electronic mechanical braking system is developing towards lightweight and compact, redundant safety design, intelligence and integration.

[0004] CN 219115422 U discloses an electronic mechanical brake system and a vehicle. The motor transmits power to the power input end of the conversion structure through the transmission structure. The conversion structure converts the rotary motion of its power input end into the linear motion of its power output end. The power output end of the conversion structure drives the piston to do linear motion to push the friction plate to compress the brake disc, so as to realize the braking of the vehicle. The motor drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the third gear to rotate, the planetary gear train structure includes a sun gear, a planet gear, a ring gear and a planet carrier, the ring gear is fixedly arranged on the shell, the third gear drives the sun gear to rotate through the connecting shaft, the sun gear drives the planet gear to rotate, the planet gear drives the planet carrier to rotate, and the planet carrier drives the ball screw to rotate. The transmission structure can realize a larger transmission ratio in a smaller space. Moreover, the ring gear is fixed to the shell through a plurality of connecting flat keys. The installation method is simple, the ring gear can be conveniently and quickly installed with the shell, and the plurality of connecting flat keys are evenly distributed along the circumference of the ring gear, so that the ring gear can be stably and firmly installed on the shell.

[0005] The disadvantages are: 1. The parking structure uses an electromagnetic valve push rod to push the pawl to rotate to make it clamped with the ratchet wheel to limit the rotation of the output shaft of the motor. The parking locking ability depends on the continuous power supply of the motor, which is high in energy consumption and has safety hazards; 2. The inspection and checking of the parking brake need to be accurately controlled, and there is a risk of early or difficult or stuck disengagement of the pawl and the ratchet gear; 3. The transmission system ring gear and the shell are installed through the flat key and the keyway, and the system occupies a large space.

[0006] The previous invention patent application CN119796151A discloses an electronic mechanical parking brake system with redundancy of mutual coupling of service brake and parking brake, comprising a brake assembly, a service brake motor with a service brake two-stage reduction output gear and a gear reduction mechanism assembly, a gear system bearing support connected with the brake assembly, an ECU controller assembly, and a parking brake motor with a parking brake two-stage reduction worm gear and a gear reduction mechanism assembly, a two-stage reduction gear system mounting shaft rotatingly arranged on the gear system bearing support, the service brake two-stage reduction output gear and the parking brake two-stage reduction worm gear being assembled on the two-stage reduction gear system mounting shaft, and the parking brake two-stage reduction worm gear and the service brake two-stage reduction output gear being coupled to realize the function of independent safety redundancy of the service brake and the parking brake. Content of the utility model

[0007] The utility model discloses a kind of electronic mechanical brake systems of service brake and parking brake coupling, to provide a kind of small, higher integrated, larger transmission ratio solution of occupied space, improve the efficiency and reliability of brake system.

[0008] To achieve the above object, the utility model provides the following technical scheme:

[0009] A kind of electronic mechanical brake systems of service brake and parking brake coupling, including service brake motor, three-gear train, planetary gear train, parking brake motor and its transmission assembly, connecting shaft, service brake motor and parking brake motor are arranged in parallel, third gear in three-gear train and parking brake two-stage reduction worm gear in transmission assembly are assembled on connecting shaft, torque is amplified output through planetary gear train, the third gear and parking brake two-stage reduction worm gear are coupled design.

[0010] As a preferred scheme of the above-mentioned electronic mechanical brake systems of service brake and parking brake coupling, the planetary gear train includes a gear ring, a sun gear, a planet gear, and a planet carrier, the sun gear is fixedly arranged on the third gear and engaged with the planet gear, the planet gear is fixedly arranged on the planet carrier and engaged with the gear ring, the planet carrier rotates to drive the power output shaft fixedly arranged at the end thereof to output brake torque, the third gear is provided with a gear groove, and the inner diameter of the gear groove is greater than the outer diameter of the gear ring, the planetary gear train is embedded in the gear groove cavity, and the planet gear drives the planet carrier to rotate and output power.

[0011] As a preferred scheme of the above-mentioned electronic mechanical brake systems of service brake and parking brake coupling, the gear ring is provided with a connecting key on the outside and is assembled and fixed with a key groove on the gear box shell.

[0012] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the triple gear train comprises a first-stage gear, a second-stage gear and a third-stage gear which are sequentially engaged, the first-stage gear is fixed on the output shaft of the service brake motor, the second-stage gear is fixedly provided with second-stage gear mounting bearings at both ends, and the third-stage gear is fixedly provided with a connecting shaft, and the connecting shaft is fixedly provided with parking second-stage worm gear mounting bearings at both ends.

[0013] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the transmission assembly comprises a parking first-stage reduction worm, a parking first-stage reduction worm gear, a parking second-stage reduction worm, a parking second-stage reduction worm gear and mounting bearings, the parking first-stage reduction worm is fixedly provided on the parking brake motor, the parking first-stage reduction worm and the parking first-stage reduction worm gear are sequentially engaged, and the parking second-stage reduction worm and the parking second-stage reduction worm gear are sequentially engaged, and the two ends of the worm are fixed by the mounting bearings.

[0014] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the third-stage gear and the parking second-stage reduction worm gear are assembled on a connecting shaft, and gear end teeth and worm gear end teeth are respectively arranged on the mating surfaces of the third-stage gear and the parking second-stage reduction worm gear.

[0015] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the first-stage gear is fixedly connected with the output shaft of the service brake motor, the second-stage gear is fixedly connected with the mounting shaft, or is integrally formed by forging, the mounting shaft is provided with second-stage gear mounting bearings or bushings at both ends, the third-stage gear is fixedly connected with the connecting shaft, and the connecting shaft is provided with parking second-stage worm gear mounting bearings at one end and a sun gear at the other end.

[0016] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the third-stage gear is fixedly connected with the connecting shaft, and the sun gear is integrally formed with the third-stage gear or is fixed by interference press fitting.

[0017] As a preferred scheme of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the parking second-stage reduction worm gear is connected with the connecting shaft through bearings or bushings, the two worm gear end teeth of the parking second-stage reduction worm gear are tightly engaged with the two gear end teeth of the third-stage gear, and the working rotation number of the third-stage gear of the triple gear train is less than 1 / 2 circle.

[0018] As a preferred solution of the above-mentioned electronic mechanical brake system coupling service brake and parking brake, the parking first-stage reduction worm is fixedly connected with the parking brake motor, the parking first-stage reduction worm is fixedly arranged on the parking second-stage reduction worm through a key groove or a spline, both ends of the parking second-stage reduction worm are provided with mounting bearings, and the parking second-stage reduction worm is integrally formed with the parking first-stage reduction worm.

[0019] The structure principle and the implementation function of the utility model are as follows:

[0020] The service brake function is realized and the power transmission path is as follows: the service brake motor outputs the service brake torque through a three-gear train transmission mechanism, the third gear is in interference fit with the sun gear, the sun gear is integrally formed or fixedly connected with the connecting shaft, the power torque is output through the planetary gear train carrier, and the service brake torque output is realized.

[0021] The parking brake function is realized and the power transmission path is as follows: the parking brake motor outputs the parking brake torque through a two-stage reduction worm gear mechanism, the parking second-stage reduction worm is in mesh with the third gear through worm end face teeth and third gear end face teeth, the parking brake torque is rotationally transmitted, the power torque is output through the planetary gear train carrier, and the parking brake torque output is realized.

[0022] The third gear and the parking second-stage reduction worm are assembled on a connecting shaft, gear end face teeth and worm end face teeth are arranged on the matching surfaces of the third gear and the parking second-stage reduction worm respectively, and the third gear and the parking second-stage reduction worm are coupled, so that the service brake torque output, the parking brake torque output or the superimposed output of the two torques can be realized.

[0023] Preferably, the parking motor and gear reduction mechanism assembly comprises a parking brake motor, a parking first-stage reduction worm and a parking second-stage reduction worm, the parking first-stage reduction worm is fixedly connected with the output shaft of the parking brake motor, the parking second-stage reduction worm is fixedly provided with the parking first-stage reduction worm, the parking first-stage reduction worm is in mesh with the parking first-stage reduction worm, and the parking second-stage reduction worm is in mesh with the parking second-stage reduction worm.

[0024] Preferably, the spoke end face of the parking second-stage reduction worm is provided with end face teeth, the spoke end face of the third gear is also provided with end face teeth, and the worm end face teeth and the gear end face teeth are in side abutment.

[0025] Preferably, the worm end face teeth and the gear end face teeth are arranged at 180° relative to each other, and the worm end face teeth are smaller in outer circle diameter than the third gear end face teeth in inner circle diameter.

[0026] The parking second-stage reduction worm gear is connected with the third-stage gear connecting shaft through a bearing or a bushing, and the parking second-stage reduction worm gear and the third-stage gear have no fixed assembly relationship, when the vehicle is in driving brake, since the rotation number of the third-stage gear is less than 1 / 2, the end face teeth of the parking second-stage reduction worm gear and the end face teeth of the third-stage gear have a gap allowance and will not interfere, and when the vehicle is started, the parking second-stage reduction worm gear is first rotated to its initial position, and then the third-stage gear is rotated to its initial position, so that the driving brake and the parking brake can work independently and do not affect each other.

[0027] When the end face teeth of the parking second-stage reduction worm gear and the end face teeth of the third-stage gear are in contact, the driving brake motor and the parking brake motor stop working, and the parking is realized through the self-locking function of the parking worm and worm gear of the parking brake system.

[0028] The first-stage gear is fixedly connected with the output shaft of the driving brake motor, the first-stage gear, the second-stage gear and the third-stage gear are fixedly connected with the respective mounting shafts through a key groove, a spline or the like, or are integrally formed, and bearings or bushings are mounted at both ends of each mounting shaft to realize the functions of reducing friction and improving efficiency.

[0029] When the vehicle is in normal driving brake, the driving brake motor drives the driving brake three-gear train to output a brake torque, and the brake torque is output through the planetary gear train;

[0030] When the driving brake system fails, the parking motor drives the worm to rotate through its own reduction mechanism, and when the end face teeth of the worm are in contact with the end face teeth of the third-stage gear of the driving brake, the driving brake gear is driven to rotate, and a certain driving brake function can still be realized.

[0031] When the vehicle needs to exceed the brake force of the normal brake in some special working conditions, the parking brake motor drives the worm to rotate through the worm and worm gear reduction mechanism, and when the end face teeth of the worm are in contact with the end face teeth of the third-stage gear, the motor superimposed torque is output together with the driving brake system, and then the brake torque is increased through the planetary gear train to meet the brake force demand in the extreme brake working condition.

[0032] When the driving brake and the parking brake are finished, the driving brake motor and the parking brake motor stop working, and the parking is realized through the self-locking function of the worm and worm gear of the parking system.

[0033] Preferably, the parking second-stage reduction worm gear is rotationally connected with the second-stage reduction gear train mounting shaft, the driving brake second-stage reduction output gear is fixedly connected with the second-stage reduction gear train mounting shaft, the driving brake second-stage reduction output gear is transmissionally connected with the driving brake motor and the gear reduction mechanism assembly, and the parking second-stage reduction worm gear is transmissionally connected with the parking motor and the gear reduction mechanism assembly.

[0034] Compared with the prior art, the utility model has the beneficial effects that:

[0035] 1, the coupling and decoupling of braking torque: the third gear and the parking two-stage reduction worm gear are coupled, that is, the driving brake torque output can be realized alone, the parking brake torque output can be realized alone, or the two torque outputs are superimposed, the safe redundant brake guarantee is provided, so that the brake system can still work normally when a single motor fails.

[0036] 2, miniaturization and integration design: the utility model discloses a parallel arrangement of the parking brake motor and the driving brake motor, the driving brake system adopts a three-gear train multi-stage transmission, the parking brake system adopts a two-stage worm gear transmission mechanism with a large speed ratio, and the output gear and the integrated planetary gear train are shared, so that the structure arrangement size is reduced, the system transmission ratio is improved, the miniaturization and integration of the brake system are realized, and the driving brake precision and the high-torque demand of the parking brake are considered.

[0037] 3, energy saving and environmental protection: the worm gear and the worm reverse self-locking structure are used in the parking mode, so that the motor does not need to be continuously powered, and the safety and energy efficiency are improved.

[0038] In summary, the electronic mechanical brake system of the driving and parking brake coupling provides an efficient, safe and rapid response brake solution through the unique design, and is suitable for the electronic mechanical brake system of the modern automobile.

[0039] The detailed structure of the utility model is further described in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a whole structure schematic view of the utility model electronic mechanical brake system of driving and parking brake coupling;

[0041] Figure 2 It is a structure schematic view of the utility model driving and parking brake coupling assembly;

[0042] Figure 3 It is a schematic view of the utility model driving brake three-gear train transmission mechanism;

[0043] Figure 4 It is a structure schematic view of the utility model driving brake three-gear train transmission cooperation assembly;

[0044] Figure 5 It is a schematic view of the utility model planetary gear train transmission assembly;

[0045] Among them:

[0046] 1, service brake motor;2, first stage gear;3, second stage gear;4, second stage gear mounting bearing;5, third stage gear;6, parking second stage reduction worm;7, parking second stage worm mounting bearing;8, parking first stage worm mounting bearing;9, parking second stage reduction worm;10, parking first stage reduction worm;11, parking first stage reduction worm;12, parking brake motor;13, ring gear;14, connecting key;21, worm end face tooth;22, gear end face tooth;23, planet carrier;24, power output shaft;25, connecting shaft;26, sun gear;27, gear groove;28, planetary gear;40, three-gear train;50, planetary gear train. DETAILED DESCRIPTION

[0047] As Figures 1-5 shown, an electronic mechanical brake system coupling service and parking brake, the main components include service brake motor 1, parking brake motor 12, three-gear train 40, planetary gear train 50 and two-stage worm gear and mounting bearing assembly, etc. The utility model discloses a parking brake motor 12 and service brake motor 1 parallel arrangement, service brake transmission gear train adopts three-gear train, parking brake adopts two-stage worm gear transmission mechanism of big speed ratio to change the transmission direction of brake force, to realize common third stage gear 5, and third stage gear 5 groove built-in planetary gear train, reduce the structure arrangement size, increase the system transmission ratio, realize the miniaturization and integration of system, be favorable to reduce weight, promote brake torque.

[0048] The three-gear train 40 includes first stage gear 2, second stage gear 3, third stage gear 5, first stage gear 2 is fixed on the output shaft of service brake motor 1, the both ends of second stage gear 3 are fixed through second stage gear mounting bearing 4, first stage gear 2 and second stage gear 3, third stage gear 5 are engaged in turn. The connecting shaft 25 is fixedly arranged on the third stage gear 5, one end of the connecting shaft 25 is fixed through the parking second stage worm mounting bearing 7.

[0049] The two-stage worm gear transmission mechanism includes parking first stage reduction worm 11, parking first stage reduction worm 10, parking second stage reduction worm 9, parking second stage reduction worm 6 and parking first stage worm mounting bearing 8, etc. The parking first stage reduction worm 11 is fixedly arranged on the parking brake motor 12, the parking first stage reduction worm 11 is engaged with the parking first stage reduction worm 10, the parking second stage reduction worm 9 is engaged with the parking second stage reduction worm 6 in turn, and the both ends of the worm are fixed by mounting bearings.

[0050] The third gear 5 and the parking second reduction worm gear 6 are assembled on a connecting shaft 25, and the mating surfaces of the third gear 5 and the parking second reduction worm gear 6 are provided with gear end face teeth 22 and worm gear end face teeth 21 respectively. The third gear 5 and the parking second reduction worm gear 6 are coupled, that is, the driving brake torque output can be realized alone, the parking brake torque output can be realized alone, or the two torques can be superimposed and output.

[0051] The planetary gear train 50 includes a ring gear 13, a sun gear 26, a planet gear 28, and a planet carrier 23. The sun gear 26 is fixedly arranged on the third gear 5 and meshes with the planet gear 28, the planet gear 28 is fixedly arranged on the planet carrier 23 and meshes with the ring gear 13, and the planet carrier 23 rotates to drive the power output shaft 24 fixed at the end thereof to output the brake torque.

[0052] The third gear 5 of the triple gear train is provided with a gear groove 27, and the inner diameter of the groove hole is greater than the outer diameter of the planet gear ring 13. The planet gear is embedded in the interior of the third gear 5 as a whole, the number of layers of the overall arrangement of the planetary gear train is reduced, the size in the height direction can be reduced by more than 20%, so that the transmission system structure is more compact, and at the same time, the planetary gear train realizes a larger transmission ratio and improves the brake force.

[0053] Specifically, the ring gear 13 is externally provided with a connecting key 14 which is assembled and fixed with a key groove on the gear box shell.

[0054] Specifically, the driving brake first gear 2 is fixedly connected with the output shaft of the driving brake motor 1, the second gear 3 is fixedly connected with the mounting shaft through a key groove, a spline or the like, or is integrally formed by forging, and the two ends of the mounting shaft are provided with a second gear mounting bearing 4 or a bushing to realize the functions of reducing the friction force and improving the efficiency. The third gear 5 is fixedly connected with the connecting shaft 25, and the two ends of the connecting shaft 25 are connected with a parking second worm gear mounting bearing 7 at one end and with a sun gear 26 at the other end. The sun gear 26 is integrally formed with the connecting shaft 25.

[0055] Alternatively, the third gear 5 and the connecting shaft 25 are fixedly connected through a spline or a key groove, and the sun gear 26 is integrally formed with the third gear 5 or is fixed by interference press fitting.

[0056] Specifically, the parking two-stage reduction worm gear 6 is connected with the connecting shaft 25 through a bearing or a bushing, and two worm end face teeth 21 of the parking two-stage reduction worm gear 6 are respectively tightly matched with two gear end face teeth 22 of the third gear 5. When the vehicle is braked, the service brake motor 1 drives the three-gear train to work, and the parking brake motor 12 can not work synchronously as a redundant backup. When the third gear 5 needs to rotate 1 / 2 circle, the two end face teeth of the parking two-stage reduction worm gear 6 can only contact the other side of the two end face teeth of the third gear 5. The two-stage reduction mechanism designed in the utility model has the advantages that the working rotation number of the third gear 5 is less than 1 / 2 circle, the two end face teeth of the parking two-stage reduction worm gear 6 and the two end face teeth of the third gear 5 have a gap and will not interfere, and when the vehicle starts, the parking brake can be manually or automatically released before the service brake, that is, the parking two-stage reduction worm gear 6 is first rotated to the initial position, and then the third gear 5 is rotated to the initial position, so that the service brake and the parking brake can work independently and will not affect each other.

[0057] Preferably, in order to install error-proof, the parking two-stage reduction worm gear 6 can be provided with end face teeth at two ends, so that the installation direction is not distinguished.

[0058] As shown in Figure 2 The service and parking brake coupling assembly comprises the parking two-stage reduction worm gear 6, the third gear 5 and the planetary gear train 50 embedded therein. The two worm end face teeth 21 of the parking two-stage reduction worm gear 6 and the two gear end face teeth 22 of the third gear 5 are respectively arranged at 180 degrees along the circumference and tightly matched after assembly. The gear groove inner diameter of the third gear 5 is greater than the gear ring 13 outer diameter of the planetary gear train 50 and is fixedly matched. The planetary carrier 23 and the power output shaft 24 output the brake torque.

[0059] As shown in Figure 5 The planetary gear train transmission assembly mainly comprises a sun gear 26, a planetary gear 28, a gear ring 13, a planetary carrier 23 and a power output shaft 24. The sun gear 26 rotates to input the torque transmitted by the service brake motor through the three-gear train or the torque transmitted to the parking two-stage reduction worm gear 6 through the two-stage worm and gear, drives the planetary gear 28 to rotate, the planetary gear rotates around the sun gear 26 and the gear ring 13, drives the planetary carrier 23 to rotate, and drives the power output shaft 24 to rotate.

[0060] Specifically, when the vehicle is braked normally, the service brake motor 1 transmits the torque to the sun gear 26 fixed on the third gear 5 through the three-gear train 40, the sun gear 26 rotates to drive the planetary gear 28 to rotate, the planetary gear rotates around the gear ring 13, drives the planetary carrier 23 to rotate, and drives the power output shaft 24 to rotate and output the brake torque.

[0061] Specifically, when the vehicle is in normal parking brake, the parking brake motor 12 rotates to input torque to the parking second-stage reduction worm gear 6 through the two-stage worm and gear transmission mechanism, the two worm end face teeth 21 of the mating surface and the two gear end face teeth 22 of the third-stage gear 5 are in close fit, and rotate around the connecting shaft 25 to transmit power torque to the sun gear 26, the sun gear 26 rotates to drive the planet gear 28 to rotate, the planet gear drives the planet carrier 23 to rotate, and the planet carrier 23 and the power output shaft 24 output brake torque.

[0062] Specifically, the parking first-stage reduction worm 11 is fixedly connected with the parking brake motor 12, and the parking first-stage reduction worm gear 10 is fixedly arranged on the parking second-stage reduction worm 9 through a key groove or spline, and the parking second-stage reduction worm 9 is provided with mounting bearings at both ends.

[0063] Specifically, the parking second-stage reduction worm 9 is integrally formed with the parking first-stage reduction worm gear 10.

[0064] Further, when the vehicle needs to exceed the normal brake force in some special working conditions, the parking brake motor 12 meshes with the parking first-stage reduction worm gear 10 through the parking first-stage reduction worm 11, and the parking brake torque is input through the parking second-stage reduction worm 9 and the second-stage reduction worm gear 6 for speed reduction and torque increase. When the end face teeth of the parking second-stage reduction worm gear 6 are in contact with the end face teeth of the third-stage gear 5, the third-stage gear 5 outputs the superimposed torque of the motor together to meet the brake force requirement in the extreme braking working condition.

[0065] When the service brake and the parking brake are finished, the service brake motor 1 and the parking brake motor 12 stop working, and the parking is realized through the self-locking function of the parking worm and gear of the parking brake system.

[0066] Further, when the service brake system fails, the parking brake motor 12 drives the parking second-stage reduction worm gear 6 to rotate through the worm and gear reduction mechanism of the parking brake motor 12, and when the end face teeth of the parking second-stage reduction worm gear 6 are in contact with the end face teeth of the third-stage gear 5, the planetary gear train is driven to transmit torque, and the service brake function can still be realized.

[0067] The above is the specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the conception of the utility model within the technical range disclosed by the utility model, and all of them should be covered in the protection scope of the utility model claim.

Claims

1. An electronic mechanical brake system of coupling service and parking brake, comprising a service brake motor (1), a three-gear train (40), a planetary gear train (50), a parking brake motor (12) and its transmission assembly, a connecting shaft (25), the service brake motor (1) and the parking brake motor (12) are arranged in parallel, the third gear (5) in the three-gear train (40) and the parking second-stage reduction worm gear (6) in the transmission assembly are assembled on the connecting shaft (25) together, and the torque is amplified and output through the planetary gear train (50), characterized in that: The third gear (5) and the parking second-stage reduction worm gear (6) are coupled, the mating surfaces of the third gear (5) and the parking second-stage reduction worm gear (6) are provided with gear end face teeth (22) and worm gear end face teeth (21) respectively, the gear end face teeth (22) and the worm gear end face teeth (21) are in abutment on the side surfaces, and the third gear (5) is rotationally connected with the parking second-stage reduction worm gear (6).

2. An electromechanical brake system for coupling service and parking brakes as defined in claim 1, wherein The planetary gear train (50) comprises a gear ring (13), a sun gear (26), a planet gear (28) and a planet carrier (23), the sun gear (26) is fixedly arranged on the third gear (5) and is in mesh with the planet gear (28), the planet gear (28) is fixedly arranged on the planet carrier (23) and is in mesh with the gear ring (13), the planet carrier (23) rotationally drives a power output shaft (24) fixed at the end of the planet carrier (23) to output a braking torque, the third gear (5) is provided with a gear groove, the inner diameter of the gear groove is greater than the outer diameter of the gear ring (13), and the planetary gear train (50) is embedded in the cavity of the gear groove (27).

3. An electromechanical brake system for coupling service and parking brakes as defined in claim 2, wherein The gear ring (13) is externally provided with a connecting key (14) which is assembled and fixed with a key groove on the gear box shell.

4. An electromechanical brake system for coupling service and parking brakes as defined in claim 1, wherein: The triple gear train (40) comprises a first-stage gear (2), a second-stage gear (3) and a third-stage gear (5) which are sequentially meshed, the first-stage gear (2) is fixed on the output shaft of the handbrake motor (1), the second-stage gear (3) is fixedly provided with second-stage gear mounting bearings (4) at both ends, and the third-stage gear (5) is fixedly provided with a connecting shaft (25), and one end of the connecting shaft (25) is fixedly provided with a parking second-stage worm gear mounting bearing (7).

5. An electromechanical brake system for coupling service and parking brakes as defined in claim 1 wherein: The transmission assembly comprises a parking first-stage reduction worm (11), a parking first-stage reduction worm gear (10), a parking second-stage reduction worm (9), a parking second-stage reduction worm gear (6) and a parking first-stage worm gear mounting bearing (8), the parking first-stage reduction worm (11) is fixedly arranged on the parking brake motor (12), the parking first-stage reduction worm (11) is in mesh with the parking first-stage reduction worm gear (10), the parking second-stage reduction worm (9) is in mesh with the parking second-stage reduction worm gear (6), and the two ends of the worm are fixed by the parking first-stage worm gear mounting bearing (8) respectively.

6. An electromechanical brake system for coupling service and parking brakes as defined in claim 1 wherein: The third gear (5) and the parking second-stage reduction worm gear (6) are assembled on a connecting shaft (25) together.

7. An electromechanical brake system for coupling service and parking brakes as defined in claim 4, wherein: The first-stage gear (2) is fixedly connected with the output shaft of the handbrake motor (1), the second-stage gear (3) is fixedly connected with the mounting shaft, or is integrally formed by forging, the mounting shaft is provided with second-stage gear mounting bearings (4) or bushings at both ends, the third-stage gear (5) is fixedly connected with the connecting shaft (25), one end of the connecting shaft (25) is connected with the parking second-stage worm gear mounting bearing (7), and the other end of the connecting shaft (25) is connected with the sun gear (26).

8. An electromechanical brake system for coupling service and parking brakes as defined in claim 2 or 4, characterized in that: The third gear (5) is fixedly connected with the connecting shaft (25), and the sun gear (26) is integrally formed with the third gear (5) or is fixed by interference pressing.

9. An electromechanical brake system for coupling service and parking brakes as defined in claim 1 wherein: The parking two-stage reduction worm gear (6) is connected with the connecting shaft (25) through a bearing or a bushing, and the two worm end face teeth (21) of the parking two-stage reduction worm gear (6) are respectively and tightly matched with the two gear end face teeth (22) of the third-stage gear (5), the working rotation number of the third-stage gear (5) of the three-gear train (40) is less than 1 / 2 circle.

10. An electromechanical brake system for coupling service and parking brakes as defined in claim 5, wherein: The parking one-stage reduction worm (11) is fixedly connected with the parking brake motor (12), the parking one-stage reduction worm gear (10) is fixedly arranged on the parking two-stage reduction worm (9) through a key groove or a spline, the parking two-stage reduction worm (9) is provided with mounting bearings at two ends, and the parking two-stage reduction worm (9) is integrally formed with the parking one-stage reduction worm gear (10).

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