Flat power transmission mechanism with non-rotating output shaft and electric brake device

Abstract

The present invention provides a flat power transmission mechanism and electric brake device with a non-rotating output shaft, which solves the problem that the existing electronic mechanical brake has a relatively complex structure and poor sealing. The mechanism includes a hollow input shaft, a planetary carrier, an output shaft and a plurality of planetary roller assemblies; each planetary roller assembly includes a planetary roller and a planetary shaft; the inner side of the hollow input shaft is provided with an internal thread or an internal annular convex groove; the planetary carrier is coaxially arranged in the hollow input shaft; a plurality of planetary roller assemblies are circumferentially arranged on the planetary carrier, and each planetary roller is provided with an external thread that matches the internal thread of the hollow input shaft; or, a plurality of planetary roller assemblies are circumferentially arranged on the planetary carrier, and a plurality of planetary rollers are sequentially staggered along the axial direction of the hollow input shaft, and each planetary roller is provided with an external annular convex groove that matches the internal thread of the hollow input shaft or an external thread that matches the internal annular convex groove of the hollow input shaft; the output shaft is eccentrically arranged at the front end of the planetary carrier, and the front end of the output shaft extends out of the hollow input shaft.

Description

Technical Field

[0001] The invention relates to an electronic mechanical brake technology, and in particular to a flat power transmission mechanism with a non-rotating output shaft and an electric brake device. Background Art

[0002] With the rapid development of automobile technology, especially the development of new energy vehicles and autonomous driving, the continuous increase in traffic density and the gradual increase in vehicle speed, people have higher and higher requirements for the safety and reliability of automobiles. Whether the automobile braking system can realize the driver's braking intention in real time, quickly and effectively has become a key issue affecting road traffic safety.

[0003] The traditional hydraulic brake system is mainly composed of a brake pedal, a brake master cylinder, a vacuum booster, a brake wheel cylinder, and a brake. When the driver steps on the brake pedal, the hydraulic oil is pressed from the brake master cylinder to the brake wheel cylinder through the hydraulic pipeline under the assistance of the vacuum booster, and acts on the brake caliper or brake shoe, and presses against the brake disc or brake drum to achieve vehicle braking. However, the hydraulic brake system has many defects, such as complex system, and the braking force needs to pass through the vacuum booster, hydraulic pipeline, etc., resulting in slow response speed, large size, difficulty in layout and assembly on the whole vehicle, complex ABS electronic control system, and high manufacturing and maintenance costs.

[0004] The electronic mechanical brake system (EMB) not only overcomes the inherent defects of the hydraulic brake system, but also has outstanding advantages such as simple system, fast braking response speed, high efficiency, etc. With the development of brushless DC motor electronic control technology and automotive electronic control technology, the EMB electronic mechanical brake system, as a new generation of automotive brakes, has the trend of replacing the current traditional hydraulic and pneumatic brake systems.

[0005] At present, the EMB electronic mechanical brake outputs braking power through the driving mechanism, drives the motion conversion mechanism to rotate, and the motion conversion mechanism drives the braking force output element to perform non-rotational axial translational motion to achieve vehicle driving braking. In order to achieve translational motion of the braking force output element, it is necessary to respectively set matching axial concave / convex grooves and guide components on the motion conversion mechanism and the braking force output element, which makes the structure more complicated. In addition, the opening of the axial concave / convex groove reduces the sealing performance, thereby limiting the scope of application. Summary of the invention

[0006] In order to solve the technical problems that the existing electronic mechanical brake needs to be provided with matching axial concave / convex grooves and guide components, making the structure more complicated, and the provision of the axial concave / convex grooves causes the sealing performance to decrease, the present invention provides a flat power transmission mechanism with a non-rotating output shaft and an electric brake device.

[0007] To achieve the above purpose, the technical solution provided by the present invention is:

[0008] A flat power transmission mechanism with a non-rotating output shaft, which is special in that:

[0009] It includes a hollow input shaft, a planet carrier, an output shaft and a plurality of planet roller assemblies; each planet roller assembly includes a planet shaft and a planet roller arranged on the planet shaft;

[0010] The planet carrier is coaxially arranged in the hollow input shaft;

[0011] The plurality of planetary shafts of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier, and each planetary roller can rotate relative to the planetary carrier;

[0012] The inner side surface of the hollow input shaft is provided with an internal thread, and each planetary roller is provided with an external thread matching the internal thread of the hollow input shaft;

[0013] Alternatively, the inner side surface of the hollow input shaft is provided with an internal thread, each planetary roller is provided with an outer annular convex groove matching with the internal thread of the hollow input shaft, and the plurality of planetary rollers are sequentially staggered along the axial direction of the hollow input shaft;

[0014] Alternatively, the inner side surface of the hollow input shaft is provided with an inner annular convex groove, each planetary roller is provided with an outer thread matching with the inner annular convex groove of the hollow input shaft, and the plurality of planetary rollers are sequentially staggered along the axial direction of the hollow input shaft;

[0015] The axis of the output shaft is not coaxial with the axis of the hollow input shaft and is eccentrically arranged at the front end of the planet carrier. The front end of the output shaft can translate axially without rotation and extend out of the hollow input shaft.

[0016] Further, a plurality of planet shafts of a plurality of planet roller assemblies are circumferentially arranged on a planet carrier;

[0017] Each planetary roller is provided with an outer annular convex groove matched with the internal thread of the hollow input shaft, and a plurality of planetary rollers are staggered in sequence along the axial direction of the hollow input shaft, specifically: each planetary roller is provided with an outer annular convex groove matched with the internal thread of the hollow input shaft, and the axial distance between adjacent planetary rollers along the hollow input shaft is 1 / N of the pitch of the internal thread of the hollow input shaft, where N is the number of planetary roller assemblies;

[0018] Each planetary roller is provided with an external thread that cooperates with the inner annular convex groove of the hollow input shaft, and multiple planetary rollers are staggered in sequence along the axial direction of the hollow input shaft. Specifically, each planetary roller is provided with an external thread that cooperates with the inner annular convex groove of the hollow input shaft, and the axial distance between adjacent planetary rollers along the hollow input shaft is 1 / N of the pitch of the external thread of the planetary roller, and N is the number of planetary roller assemblies.

[0019] Furthermore, the hollow input shaft comprises a cylinder with an opening at the front end and a front end cover arranged at the open end of the cylinder; a dynamic sealing structure is arranged between the front end cover and the output shaft. The dynamic sealing structure comprises a sleeve and a sealing ring, the front end cover is provided with a through hole for the output shaft to extend out, the sleeve is arranged in the through hole of the front end cover, and the sealing ring is arranged between the sleeve and the output shaft and between the sleeve and the front end cover;

[0020] Further, the planet carrier is an I-shaped structure, which includes a front planet carrier body, a rear planet carrier body, and a connecting rod arranged between the middle of the front planet carrier body and the middle of the rear planet carrier body; a plurality of planet rollers are arranged on the outer periphery of the connecting rod;

[0021] Alternatively, the planet carrier is a squirrel cage structure, which includes a front planet carrier body, a rear planet carrier body, and a squirrel cage sleeve arranged between the front planet carrier body and the rear planet carrier body; a plurality of planet rollers are located in the squirrel cage sleeve, and the planet rollers can be engaged with the internal thread or the inner annular convex groove of the hollow input shaft;

[0022] Alternatively, the planetary carrier is an I-shaped squirrel cage structure, which includes a front planetary carrier body, a rear planetary carrier body, a squirrel cage sleeve arranged between the front planetary carrier body and the rear planetary carrier body, and a connecting rod arranged between the middle part of the front planetary carrier body and the middle part of the rear planetary carrier body, and a plurality of planetary rollers are arranged on the outer periphery of the connecting rod and are located in the squirrel cage sleeve, and the planetary rollers can engage with the internal thread or inner annular convex groove of the hollow input shaft.

[0023] Furthermore, each planetary shaft is provided with an automatic centering mechanism, which includes a spherical centering unit and a second thrust bearing which is sleeved on the planetary shaft and located between the planetary carrier and the planetary roller;

[0024] The spherical centering unit comprises a spherical seat and a spherical projection which cooperate to form a spherical pair;

[0025] Bearings are arranged between the planetary rollers and the planetary shafts.

[0026] Furthermore, the front end portion of the output shaft is provided with an eccentrically arranged force output member, and the axis of the force output member is coaxial with the axis of the hollow input shaft.

[0027] Meanwhile, the present invention also provides an electric brake device, which is special in that it comprises a housing, a driving motor and a braking force transmission mechanism arranged in the housing;

[0028] The braking force transmission mechanism comprises a hollow input shaft, a planet carrier, an output shaft and a plurality of planet roller assemblies; each planet roller assembly comprises a planet shaft and a planet roller arranged on the planet shaft;

[0029] The driving motor drives the hollow input shaft to rotate;

[0030] The planet carrier is coaxially arranged in the hollow input shaft;

[0031] The plurality of planetary shafts of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier, and each planetary roller can rotate relative to the planetary carrier;

[0032] The inner side surface of the hollow input shaft is provided with an internal thread, and each planetary roller is provided with an external thread matching the internal thread of the hollow input shaft; preferably, the plurality of planetary roller assemblies are evenly distributed along the same circumference;

[0033] Alternatively, the inner side surface of the hollow input shaft is provided with an internal thread, each planetary roller is provided with an outer annular convex groove matched with the internal thread of the hollow input shaft, and the plurality of planetary rollers are sequentially staggered along the axial direction of the hollow input shaft; preferably, the plurality of planetary shafts of the plurality of planetary roller assemblies are evenly distributed around the circumference, and the difference between adjacent planetary rollers along the axial direction of the hollow input shaft is 1 / N of the pitch of the internal thread of the hollow input shaft, where N is the number of planetary roller assemblies;

[0034] Alternatively, the inner side surface of the hollow input shaft is provided with an inner annular convex groove, each planetary roller is provided with an external thread matched with the inner annular convex groove of the hollow input shaft, and the plurality of planetary rollers are sequentially staggered along the axial direction of the hollow input shaft; preferably, the plurality of planetary shafts of the plurality of planetary roller assemblies are evenly distributed around the circumference, and the difference between adjacent planetary rollers along the axial direction of the hollow input shaft is 1 / N of the pitch of the external thread of the planetary roller, where N is the number of planetary roller assemblies;

[0035] The output shaft is eccentrically arranged at the front end of the planet carrier, and its front end is supported by the housing and can extend out of the housing in a translational manner.

[0036] Further, the planet carrier is an I-shaped structure, which includes a front planet carrier body, a rear planet carrier body, and a connecting rod arranged between the middle of the front planet carrier body and the middle of the rear planet carrier body; a plurality of planet rollers are arranged on the outer periphery of the connecting rod;

[0037] Alternatively, the planet carrier is a squirrel cage structure, which includes a front planet carrier body, a rear planet carrier body, and a squirrel cage sleeve arranged between the front planet carrier body and the rear planet carrier body; a plurality of planet rollers are located in the squirrel cage sleeve, and the planet rollers can be engaged with the internal thread or the inner annular convex groove of the hollow input shaft;

[0038] Alternatively, the planetary carrier is an I-shaped squirrel cage structure, which includes a front planetary carrier body, a rear planetary carrier body, a squirrel cage sleeve arranged between the front planetary carrier body and the rear planetary carrier body, and a connecting rod arranged between the middle part of the front planetary carrier body and the middle part of the rear planetary carrier body, and a plurality of planetary rollers are arranged on the outer periphery of the connecting rod and are located in the squirrel cage sleeve, and the planetary rollers can engage with the internal thread or inner annular convex groove of the hollow input shaft.

[0039] Further, the housing comprises a front end cover, an intermediate housing and a rear cover which are connected in sequence;

[0040] The hollow input shaft is a cylindrical structure with an open front end, and its front end dynamic seal is arranged on the inner wall of the cylindrical hole of the front end cover;

[0041] The front end cover is provided with a through hole for the output shaft to extend out, and a dynamic sealing structure is provided between the front end cover and the output shaft.

[0042] Furthermore, each planetary shaft is provided with an automatic centering mechanism, which includes a spherical centering unit sleeved on the planetary shaft and located between the planetary carrier and the planetary roller, and a second thrust bearing;

[0043] The spherical centering unit comprises a spherical seat and a spherical projection which cooperate to form a spherical pair.

[0044] Furthermore, the dynamic sealing structure comprises a sliding sleeve and a sealing ring, the sliding sleeve is arranged in the through hole of the front end cover, and the sealing ring is arranged between the sliding sleeve and the output shaft and between the sliding sleeve and the front end cover;

[0045] Bearings are arranged between the planetary rollers and the planetary shafts.

[0046] Furthermore, the intermediate shell has a connecting plate inside, dividing the inner cavity of the shell into a front cavity and a rear cavity;

[0047] The drive motor and the braking force transmission mechanism are both located in the front cavity, the motor rotor of the drive motor is a hollow structure, and the hollow input shaft of the braking force transmission mechanism is coaxially fixed in the motor rotor;

[0048] A magnet fixing shaft supported on a connecting plate is provided in the middle of the rear end surface of the hollow input shaft, and an induction magnet is provided at the rear end of the magnet fixing shaft;

[0049] A circuit board is arranged in the rear cavity, and a magnetic induction element is arranged on the circuit board at a position opposite to the induction magnet.

[0050] Furthermore, a clutch lock mechanism is provided on the outer side of the hollow input shaft, which is used to separate and lock the hollow input shaft;

[0051] The front end of the output shaft is provided with an eccentrically arranged force output member, and the axis of the force output member is coaxial with the axis of the hollow input shaft.

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] 1. The braking force transmission mechanism of the present invention adopts a planetary roller mechanism (a planetary carrier and multiple planetary roller assemblies) to achieve a larger braking force output with a smaller structure and high-efficiency braking force output; when the hollow input shaft rotates, since the output shaft and the planetary carrier are eccentrically arranged, the internal thread lead angle or the inner annular convex and concave groove on the inner wall of the hollow input shaft will drive the planetary roller to rotate instead of revolving, and then the planetary roller pushes the planetary carrier and the output shaft to move forward and backward in a non-rotating translational direction along the axis of the output shaft to achieve vehicle driving braking. At the same time, the input shaft is a hollow structure, which can ensure sealing, so that the planetary roller oil lubrication can be achieved and water or impurities can be prevented from entering the force transmission mechanism to affect the force transmission effect.

[0054] 2. The braking force transmission mechanism of the electric brake device of the present invention adopts a planetary roller mechanism, which can achieve a larger braking force output with a smaller structure, which makes the device easy to install and ensures high-efficiency braking force output. The electric brake device of the present invention has the characteristics of compact structure, large output braking force, easy installation and high reliability.

[0055] 3. The motor rotor of the present invention is designed as a hollow structure, and the braking force transmission mechanism is built into the hollow part of the motor rotor, which fully utilizes the limited space and reduces the volume of the electric brake device.

[0056] 4. The electric brake device of the present invention can realize the self-locking of the mechanism when power is off through the clutch lock locking mechanism to achieve the parking brake function, thereby integrating the functions of driving brake and parking brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a structural schematic diagram of a first embodiment of an electric brake device of the present invention;

[0058] Figure 2 1 is a schematic structural diagram of a braking force transmission mechanism in Embodiment 1 of the electric brake device of the present invention (the hollow input shaft is not shown);

[0059] Figure 3 yes Figure 2 A cross-sectional view of

[0060] Figure 4 It is a structural schematic diagram of the clutch lock locking mechanism in the first embodiment of the electric brake device of the present invention;

[0061] Figure 5 It is a structural schematic diagram of the automatic centering mechanism in the first embodiment of the electric brake device of the present invention;

[0062] Figure 6 Schematic diagram of the structure of another braking force transmission mechanism in Embodiment 1 of the electric brake device of the present invention (the hollow input shaft is not shown);

[0063] Figure 7It is a structural schematic diagram of the automatic centering mechanism in the second embodiment of the electric brake device that is easy for friction rolling and clearance compensation of the present invention;

[0064] Figure 8 This is a schematic structural diagram of a fourth embodiment of an electric brake device of the present invention;

[0065] The reference numerals are as follows:

[0066] 1-front end cover, 2-middle housing, 3-rear cover, 4-motor stator, 5-motor rotor, 6-first thrust bearing, 7-output shaft, 71-rear planetary carrier, 72-front planetary carrier, 73-squirrel cage sleeve, 8-hollow input shaft, 81-internal thread, 82-magnet fixed shaft, 9-planetary roller, 91-external thread, 10-planetary shaft, 11-induction magnet, 12-sleeve, 13-fixing screw, 14-circuit board, 15-shaft retaining ring, 16-electromagnetic brake, 17-locking fixed ring, 18-locking outer ring, 19-friction plate, 20-dynamic pressure plate, 21-second thrust bearing, 22-spherical bump, 23-spherical seat, 24-first adjusting gasket, 25-second adjusting gasket, 26-bearing, 27-force output member, 28-connecting plate, 30-drive motor, 31-reducer, 311-reducer housing. DETAILED DESCRIPTION

[0067] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0068] Embodiment 1

[0069] like Figure 1 As shown, an electric brake device with a sealing function includes a housing and a drive motor 30, a braking force transmission mechanism, a control unit and a clutch lock mechanism arranged in the housing.

[0070] The shell includes a front cover 1, an intermediate shell 2 and a rear cover 3 connected in sequence. The intermediate shell 2 has a connecting plate 28, which divides the inner cavity of the shell into a front cavity and a rear cavity. The front cover 1 is provided with fixing screws 13 to facilitate the fixed connection between the electric brake device of this embodiment as a whole and the wheel end of the external vehicle.

[0071] The drive motor 30 is arranged in the front cavity. The drive motor 30 consists of a motor stator 4 and a motor rotor 5. The motor stator 4 is fixed on the front end cover 1. In this embodiment, the motor rotor 5 is designed as a hollow structure, and the braking force transmission mechanism is built into the hollow part of the motor rotor 5, which makes full use of the limited space and reduces the volume of the electric braking device.

[0072] The braking force transmission mechanism includes a hollow input shaft 8, a planet carrier, an output shaft 7 and a plurality of planet roller assemblies; the hollow input shaft 8 is coaxially arranged in the motor rotor 5, the outer wall of the hollow input shaft 8 is fixedly connected to the inner wall of the motor rotor 5, and both ends of the outer circle side of the hollow input shaft 8 can be directly or indirectly fixed to the front end cover 1 through the first thrust bearing 6; the hollow input shaft 8 can be driven to rotate by the motor rotor 5; the hollow input shaft 8 is a cylindrical structure with an open front end, and the front end dynamic seal is arranged on the front end cover 1; the inner side of the hollow input shaft 8 is provided with an internal thread 81;

[0073] The planetary carrier is coaxially arranged at the rear side of the hollow input shaft 8 by a clearance fit; multiple planetary roller assemblies are arranged circumferentially on the planetary carrier, and preferably multiple planetary roller assemblies are evenly distributed along the same circumference; each planetary roller assembly includes a planetary shaft 10 arranged on the planetary carrier and a planetary roller 9 arranged on the planetary shaft 10, and multiple planetary rollers 9 are respectively installed on the planetary carrier through multiple planetary shafts 10, and the outer circumferential surface of each planetary roller 9 is provided with an external thread 91 meshing with the internal thread 81 of the hollow input shaft 8; in this embodiment, the planetary shaft 10 is arranged on the planetary carrier, and at least one bearing 26 is arranged between the planetary roller 9 and the planetary shaft 10, and the bearing 26 is a radial bearing, and both ends of the planetary shaft 10 extend out of the planetary carrier and are fixed to the planetary carrier by a shaft retaining ring 15, so that the planetary roller 9 can only rotate around the planetary shaft 10. In other embodiments, a bearing can also be arranged between the planetary shaft 10 and the planetary carrier, and the planetary roller 9 is fixedly connected to the planetary shaft 10 to realize the rotation of the planetary roller 9 and the planetary shaft 10 on the planetary carrier.

[0074] The axis of the output shaft 7 is not coaxial with the axis of the hollow input shaft 8, that is, the output shaft 7 is eccentrically arranged at the front end of the planet carrier. Figure 3 As shown, the eccentric distance d between the output shaft 7 and the planetary carrier in this embodiment can be designed to be 1mm~3mm, and the front end of the output shaft 7 can extend axially and non-rotatingly out of the front end cover 1. Since the output shaft 7 and the planetary carrier are eccentrically arranged, in order to prevent the resistance acting on the output shaft 7 from reacting inconsistently to the evenly distributed planetary roller assembly, resulting in eccentric wear of the planetary rollers 9, the force output member 27 at the front end of the output shaft in this embodiment is eccentrically arranged with the output shaft, and the axis of the force output member 27 is coaxial with the axis of the hollow input shaft 8, so that the direction of the resistance action can be coaxial with the input shaft 8, thereby avoiding eccentric wear of the planetary rollers 9. A dynamic sealing structure is arranged between the front end cover 1 and the output shaft 7, and the dynamic sealing structure includes a sleeve 12 and a sealing ring. A through hole is arranged on the front end cover 1 for the output shaft 7 to extend out, and the sleeve 12 is arranged in the through hole of the front end cover 1. The sealing ring is arranged between the sleeve 12 and the output shaft 7 and between the sleeve 12 and the front end cover 1, and is mainly used for sealing the front end cover 1 and guiding the output shaft 7. In order to improve the guiding effect, the sleeve 12 can be a metal or non-metal sleeve.

[0075] This embodiment provides two structural forms of the planet carrier. The first one is as follows: Figure 2 As shown, the planet carrier is a hollow structure, which includes a front planet carrier body 72, a rear planet carrier body 71 and a squirrel cage sleeve 73 arranged between the front planet carrier body 72 and the rear planet carrier body 71. There are four planet roller assemblies, and the four planet rollers 9 are located in the squirrel cage sleeve 73, and the planet rollers 9 can engage with the internal threads 81 on the inner side of the hollow input shaft 8; in order to improve the rigidity and stability of the planet carrier connection, a connecting rod is provided between the middle part of the front planet carrier body 72 and the middle part of the rear planet carrier body 71, and the front planet carrier body 72, the rear planet carrier body 71, the connecting rod, the squirrel cage sleeve 73 and the output shaft 7 are a whole, but the central axis of the front planet carrier body 72 and the rear planet carrier body 71 is set to be coaxial with the central axis of the output shaft 7. Such a setting can make the planet rollers 9 only rotate but not revolve. The rotation of the hollow input shaft 8 and the helix angle on its inner wall will only drive the planet carrier and the output shaft 7 to translate forward and backward along the axial direction of the output shaft 7, while the planet carrier and the output shaft 7 cannot rotate. The second type, such as Figure 6 As shown, the planet carrier is an I-shaped structure, which includes a front planet carrier body 72, a rear planet carrier body 71, and a connecting rod arranged between the middle of the front planet carrier body 72 and the middle of the rear planet carrier body 71. There are 6 planetary roller assemblies, and the 6 planetary rollers 9 are evenly distributed on the periphery of the connecting rod.

[0076] like Figure 5 As shown, the planetary shaft 10 of this embodiment is equipped with an automatic centering mechanism, which includes a spherical centering unit and a second thrust bearing 21 which are arranged in sequence from front to back between the front planetary carrier body 72 and the front end surface of the planetary roller 9. The spherical centering unit includes a tiltable spherical seat 23 and a tiltable spherical protrusion 22 which cooperate to form a spherical pair. The spherical protrusion 22 is arranged adjacent to the second thrust bearing 21. The spherical centering unit is used to adjust the planetary roller 9 and the planetary shaft 10 to always be on the same axis, thereby reducing the force loss during the transmission process.

[0077] like Figure 1 As shown, the control unit includes an induction magnet 11 and a circuit board 14. The rear end of the hollow input shaft 8 is provided with a magnet fixing shaft 82 supported on the connecting plate 28, and the induction magnet 11 is arranged on the magnet fixing shaft 82; the circuit board 14 is arranged on the intermediate shell 2 and is located in the rear cavity. A magnetic sensing element is provided on the circuit board 14 at a position relative to the induction magnet 11. The magnetic sensing element can identify the strength of the radial N / S level magnetic field of the induction magnet 11 during movement. The circuit board 14 is used to analyze and calculate the stroke of the translational movement of the output shaft 7 and perform real-time control.

[0078] like Figure 4As shown, the clutch lock locking mechanism is arranged on the outer side of the rear end of the hollow input shaft 8, and the clutch lock locking mechanism is mainly composed of an electromagnetic brake 16, a locking fixed ring 17, a locking outer ring 18, a friction plate 19 and a dynamic pressure plate 20. The electromagnetic brake 16 is fixed on the intermediate housing 2, one end of the dynamic pressure plate 20 is in contact with or close to the electromagnetic brake 16, and the other end is close to or in contact with the friction plate 19. A plurality of springs are arranged in the electromagnetic brake 16, one end of which is in contact with the electromagnetic brake 16 itself, and the other end is in contact with the dynamic pressure plate 20; the other end of the friction plate 19 is in contact with or close to the inner wall of the locking outer ring 18, the outer ring and the inner ring of the locking fixed ring 17 are both provided with splines, the inner ring splines are meshed with the splines arranged on the outer wall of the hollow input shaft 8, and the outer ring splines are meshed with the splines arranged on the inner ring of the friction plate 19. The clutch lock locking mechanism can realize the separation and locking of the hollow input shaft 8 respectively by energizing or de-energizing the electromagnetic brake 16.

[0079] The braking action process of the electric brake device in this embodiment is as follows:

[0080] During driving, when the driver steps on the brake pedal, the drive motor 30 starts, and the motor rotor 5 drives the hollow input shaft 8 to rotate. The rotation of the hollow input shaft 8 drives multiple planetary rollers 9 to rotate. Since the central axis of the planetary carrier and the central axis of the output shaft 7 are set to be coaxial, the planetary rollers 9 can only rotate around the planetary shaft 10. Furthermore, the planetary rollers 9 push the planetary carrier and the output shaft 7 to translate forward along the axial direction of the output shaft 7. The force output member 27 at the front end of the output shaft 7 is fixedly connected to the vehicle brake pad, thereby realizing vehicle driving braking.

[0081] Embodiment 2

[0082] The difference from the first embodiment is that: Figure 7 As shown, each planetary roller 9 is provided with an outer annular convex groove matched with the internal thread 81 of the hollow input shaft 8, and each planetary shaft 10 is also provided with a first adjusting gasket 24 and a second adjusting gasket 25, the first adjusting gasket 24 is located between the front planetary carrier body 72 and the spherical seat 23, and the second adjusting gasket 25 is located between the rear end face of the planetary roller 9 and the rear planetary carrier body 71, and by adjusting the thickness of the first adjusting gasket 24 and the second adjusting gasket 25, multiple planetary rollers 9 are sequentially staggered along the axial direction of the hollow input shaft 8, and preferably multiple planetary roller assemblies are evenly distributed around the circumference, then the adjacent planetary rollers 9 differ in the axial direction of the hollow input shaft 8 by 1 / N of the pitch of the internal thread of the hollow input shaft, N being the number of planetary roller assemblies, so as to realize the threaded engagement of multiple planetary rollers 9 with the helix angle of the inner wall of the hollow input shaft 8 in the axial direction, and the outer annular convex groove of the planetary roller 9 can be a straight line or arc tooth profile matching the tooth profile of the hollow input shaft 8. In other embodiments, the first adjusting gasket 24 and the second adjusting gasket 25 may be implemented by bosses provided on the planet carrier.

[0083] Embodiment 3

[0084] The difference from the second embodiment is that an inner annular convex groove is provided on the inner side surface of the hollow input shaft 8, and each planetary roller 9 is provided with an external thread 91 that cooperates with the inner annular convex groove of the hollow input shaft 8. By adjusting the thickness of the first adjustment gasket 24 and the second adjustment gasket 25, the difference between adjacent planetary rollers along the axial direction of the hollow input shaft is 1 / N of the pitch of the external threads of the planetary rollers, so that the external threads of multiple planetary rollers 9 are axially meshed with the inner annular convex groove of the inner wall of the hollow input shaft 8.

[0085] Embodiment 4

[0086] The difference from the first to third embodiments is that: Figure 8 As shown, the drive motor 30 is located on the outside of the shell, and the rear end of the hollow input shaft 8 of the braking force transmission mechanism extends out of the shell and is connected to the drive motor 30 through the reducer 31; the control unit is not shown in the figure, and the rear end of the hollow input shaft 8 is provided with a magnet fixing shaft 82 supported on the reducer housing 311, and the induction magnet 11 of the control unit is arranged on the magnet fixing shaft 82; the circuit board 14 is arranged on the outside of the shell, and a magnetic sensing element is provided on the circuit board 14 at a position relative to the induction magnet 11. The magnetic sensing element can identify the strength of the radial N / S level magnetic field of the induction magnet 11 during the movement, and the circuit board 14 is used to analyze and calculate the stroke of the translational movement of the output shaft 7 and perform real-time control.

[0087] The above is only a description of the preferred implementation mode of the present invention, and the technical solution of the present invention is not limited thereto. Any modification made by those skilled in the art on the basis of the main technical concept of the present invention belongs to the technical scope to be protected by the present invention.

Claims

1. A flat power transmission mechanism with a non-rotating output shaft, Features: It comprises a hollow input shaft (8), a planet carrier, an output shaft (7) and a plurality of planet roller assemblies; each planet roller assembly comprises a planet shaft (10) and a planet roller (9) arranged on the planet shaft (10); The planet carrier is coaxially arranged inside the hollow input shaft (8); The plurality of planetary shafts (10) of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier, and each planetary roller (9) is capable of rotating relative to the planetary carrier; The inner side surface of the hollow input shaft (8) is provided with an internal thread (81), and each planetary roller (9) is provided with an external thread (91) matching with the internal thread (81) of the hollow input shaft (8); Alternatively, the inner side surface of the hollow input shaft (8) is provided with an internal thread (81), each planetary roller (9) is provided with an outer annular convex-concave groove matching the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8); Alternatively, the inner side surface of the hollow input shaft (8) is provided with an inner annular convex groove, each planetary roller (9) is provided with an outer thread (91) that matches the inner annular convex groove of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8); The output shaft (7) is eccentrically arranged at the front end of the planet carrier, and the front end of the output shaft (7) extends out of the hollow input shaft (8).

2. The flat power transmission mechanism with a non-rotating output shaft according to claim 1, Features: The plurality of planetary shafts (10) of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier; Each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8), specifically: each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the axial distance between adjacent planetary rollers (9) along the hollow input shaft (8) is 1 / N of the pitch of the internal thread (81) of the hollow input shaft (8), where N is the number of planetary roller assemblies; Each planetary roller (9) is provided with an external thread (91) that matches with the inner annular convex groove of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8). Specifically, each planetary roller (9) is provided with an external thread (91) that matches with the inner annular convex groove of the hollow input shaft (8), and the axial distance between adjacent planetary rollers (9) along the hollow input shaft (8) is 1 / N of the pitch of the external thread (91) of the planetary roller (9), where N is the number of planetary roller assemblies.

3. The flat power transmission mechanism with a non-rotating output shaft according to claim 2, Features: The hollow input shaft (8) comprises a cylinder with an open front end and a front end cover (1) arranged at the open end of the cylinder; a dynamic sealing structure is arranged between the front end cover (1) and the output shaft (7).

4. The flat power transmission mechanism with a non-rotating output shaft according to claim 1, 2 or 3, Features: The planet carrier is an I-shaped structure, comprising a front planet carrier body (72), a rear planet carrier body (71), and a connecting rod arranged between the middle of the front planet carrier body (72) and the middle of the rear planet carrier body (71); a plurality of planet rollers (9) are arranged on the outer periphery of the connecting rod; Alternatively, the planet carrier is a squirrel cage structure, comprising a front planet carrier body (72), a rear planet carrier body (71), and a squirrel cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71); a plurality of planet rollers (9) are located in the squirrel cage sleeve (73), and the planet rollers (9) can mesh with the internal thread (81) or the inner annular convex groove of the hollow input shaft (8); Alternatively, the planet carrier is an I-shaped squirrel cage structure, which includes a front planet carrier body (72), a rear planet carrier body (71), a squirrel cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71), and a connecting rod arranged between the middle part of the front planet carrier body (72) and the middle part of the rear planet carrier body (71), a plurality of planetary rollers (9) are arranged on the outer periphery of the connecting rod and are located in the squirrel cage sleeve (73), and the planetary rollers (9) can engage with the internal thread (81) or the inner annular convex groove of the hollow input shaft (8).

5. The flat power transmission mechanism with a non-rotating output shaft according to claim 3, Features: Each planetary shaft (10) is provided with an automatic centering mechanism, which comprises a spherical centering unit and a second thrust bearing (21) which is sleeved on the planetary shaft (10) and located between the planetary carrier and the planetary roller (9); The spherical centering unit comprises a spherical seat (23) and a spherical projection (22) which cooperate to form a spherical pair; A bearing (26) is provided between the planetary roller (9) and the planetary shaft (10); An eccentrically arranged force output member (27) is provided at the front end of the output shaft (7), and the axis of the force output member (27) is coaxial with the axis of the hollow input shaft (8).

6. An electric brake device, Features: It comprises a housing, a driving motor (30) and a braking force transmission mechanism arranged in the housing; The braking force transmission mechanism comprises a hollow input shaft (8), a planet carrier, an output shaft (7) and a plurality of planet roller assemblies; each planet roller assembly comprises a planet shaft (10) and a planet roller (9) arranged on the planet shaft (10); The driving motor (30) drives the hollow input shaft (8) to rotate; The planet carrier is coaxially arranged inside the hollow input shaft (8); The plurality of planetary shafts (10) of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier, and each planetary roller (9) is capable of rotating relative to the planetary carrier; The inner side surface of the hollow input shaft (8) is provided with an internal thread (81), and each planetary roller (9) is provided with an external thread (91) matching with the internal thread (81) of the hollow input shaft (8); Alternatively, the inner side surface of the hollow input shaft (8) is provided with an internal thread (81), each planetary roller (9) is provided with an outer annular convex-concave groove matching the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8); Alternatively, the inner side surface of the hollow input shaft (8) is provided with an inner annular convex groove, each planetary roller (9) is provided with an outer thread (91) that matches the inner annular convex groove of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8); The output shaft (7) is eccentrically arranged at the front end of the planet carrier, and its front end is supported by the outer shell and extends out of the outer shell.

7. The electric brake device according to claim 6, Features: The plurality of planetary shafts (10) of the plurality of planetary roller assemblies are circumferentially arranged on a planetary carrier; Each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8), specifically: each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the axial distance between adjacent planetary rollers (9) along the hollow input shaft (8) is 1 / N of the pitch of the internal thread (81) of the hollow input shaft (8), where N is the number of planetary roller assemblies; Each planetary roller (9) is provided with an external thread (91) that matches with the inner annular convex groove of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially staggered along the axial direction of the hollow input shaft (8). Specifically, each planetary roller (9) is provided with an external thread (91) that matches with the inner annular convex groove of the hollow input shaft (8), and the axial distance between adjacent planetary rollers (9) along the hollow input shaft (8) is 1 / N of the pitch of the external thread (91) of the planetary roller (9), where N is the number of planetary roller assemblies.

8. The electric brake device according to claim 7, Features: The planet carrier is an I-shaped structure, comprising a front planet carrier body (72), a rear planet carrier body (71), and a connecting rod arranged between the middle of the front planet carrier body (72) and the middle of the rear planet carrier body (71); a plurality of planet rollers (9) are arranged on the outer periphery of the connecting rod; Alternatively, the planet carrier is a squirrel cage structure, comprising a front planet carrier body (72), a rear planet carrier body (71), and a squirrel cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71); a plurality of planet rollers (9) are located in the squirrel cage sleeve (73), and the planet rollers (9) can mesh with the internal thread (81) or the inner annular convex groove of the hollow input shaft (8); Alternatively, the planet carrier is an I-shaped squirrel cage structure, which includes a front planet carrier body (72), a rear planet carrier body (71), a squirrel cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71), and a connecting rod arranged between the middle part of the front planet carrier body (72) and the middle part of the rear planet carrier body (71), a plurality of planetary rollers (9) are arranged on the outer periphery of the connecting rod and are located in the squirrel cage sleeve (73), and the planetary rollers (9) can engage with the internal thread (81) or the inner annular convex groove of the hollow input shaft (8).

9. The electric brake device according to claim 6, 7 or 8, Features: The housing comprises a front cover (1), an intermediate shell (2) and a rear cover (3) which are connected in sequence; The hollow input shaft (8) is a cylindrical structure with an open front end, and a front end dynamic seal is arranged on the inner wall of the front end cover (1); The front end cover (1) is provided with a through hole for the output shaft (7) to extend out, and a dynamic sealing structure is provided between the front end cover (1) and the output shaft (7).

10. The electric brake device according to claim 9, Features: Each planetary shaft (10) is provided with an automatic centering mechanism, which comprises a spherical centering unit and a second thrust bearing (21) which is sleeved on the planetary shaft (10) and located between the planetary carrier and the planetary roller (9); The spherical centering unit comprises a spherical seat (23) and a spherical projection (22) which cooperate to form a spherical pair; The dynamic sealing structure comprises a sliding sleeve (12) and a sealing ring, the sliding sleeve (12) being arranged in a through hole of the front end cover (1), and the sealing ring being arranged between the sliding sleeve (12) and the output shaft (7) and between the sliding sleeve (12) and the front end cover (1); A bearing (26) is arranged between the planetary roller (9) and the planetary shaft (10).

11. The electric brake device according to claim 10, Features: The intermediate shell (2) has a connecting plate (28) inside, dividing the inner cavity of the shell into a front cavity and a rear cavity; The drive motor (30) and the braking force transmission mechanism are both located in the front cavity; the motor rotor (5) of the drive motor (30) is a hollow structure; and the hollow input shaft (8) of the braking force transmission mechanism is coaxially fixed in the motor rotor (5); A magnet fixing shaft (82) supported on a connecting plate (28) is provided at the middle of the rear end surface of the hollow input shaft (8), and an induction magnet (11) is provided at the rear end of the magnet fixing shaft (82); A circuit board (14) is provided in the rear cavity, and a magnetic sensing element is provided on the circuit board (14) at a position opposite to the sensing magnet (11); A clutch lock mechanism is provided on the outer side of the hollow input shaft (8) for realizing separation and locking of the hollow input shaft (8); The front end of the output shaft (7) is provided with an eccentrically arranged force output member (27), and the axis of the force output member (27) is coaxial with the axis of the hollow input shaft (8).

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