Compact permanent magnet brushless motor and electromagnetic clutch assembly structure

Abstract

The invention relates to the technical field of motors and electromagnetic clutches, in particular to a compact permanent magnet brushless motor and electromagnetic clutch assembly structure which comprises a stator assembly and a rotor assembly of a permanent magnet brushless motor. The rotor assembly is arranged in the stator assembly; the device further comprises a supporting shaft and a transmission sleeve. The rotor assembly comprises a rotor wheel disc; the rotor wheel disc and the transmission sleeve are rotationally mounted on the supporting shaft in sequence from back to front; an internal spline gear ring is integrally formed on the peripheral surface of the transmission sleeve; the outer peripheral surface of the transmission sleeve is slidably sleeved with an armature, and an outer spline gear ring is integrally formed on the armature; the internal spline gear ring and the external spline gear ring form a spline pair in axial sliding fit; a clutch armature and a main rotating gear ring are mounted on the rotor wheel disc; an auxiliary transmission gear ring is sleeved on the peripheral surface of the armature; transmission teeth are respectively arranged on the right end surface of the main rotating gear ring and the left end surface of the auxiliary transmission gear ring; and a reset mechanism is arranged between the inner spline gear ring and the armature.

Description

Technical Field

[0001] The present invention relates to the technical fields of motors and electromagnetic clutches, and particularly relates to an assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch. Background Art

[0002] In fields such as automobile wheels and aircraft landing gears, a large torque motor is required to drive a transmission shaft to rotate, and a clutch is needed to ensure reliable mechanical disconnection between the motor and the transmission shaft, so as to ensure the highly reliable operation of the entire system. The large torque motor can achieve large torque drive and constitute a large torque power source. The electromagnetic clutch can achieve reliable mechanical separation between the motor and the system, and realize highly reliable transmission of the motor and the transmission shaft in the system. The traditional large torque motor and the electromagnetic clutch are designed separately, and an assembly system of the motor and the electromagnetic clutch is formed through the structure between the large torque motor and the electromagnetic clutch. In automobile wheels and aircraft landing gear wheels, there is a central stationary shaft as a support shaft. In order to ensure the installation and fixation of the motor and the electromagnetic clutch on the support shaft with a central fixation, it is necessary to change the installation and fixation methods of the motor and the electromagnetic clutch to achieve the highly integrated design, installation and fixation of the motor and electromagnetic clutch assembly system.

[0003] In the prior art, for example, a patent application with the publication number CN106938609A discloses a clutch-coupled motor assembly device, and a patent with the publication number CN201985687U discloses an automobile automatic door motor with an electromagnetic clutch.

[0004] However, in the above prior art, there is no disclosure on how to install the motor and the electromagnetic clutch on the support shaft with a central fixation to obtain an assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch. Summary of the Invention

[0005] The main object of the present invention is to propose an assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides an assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch, which includes a stator assembly and a rotor assembly of the permanent magnet brushless motor; the rotor assembly is arranged inside the stator assembly; it also includes a support shaft and a transmission sleeve; the rotor assembly includes a rotor disc; the rotor disc and the transmission sleeve are sequentially and rotatably installed on the support shaft from back to front; an internal spline gear ring is integrally formed on the outer peripheral surface of the transmission sleeve; an armature is slidably sleeved on the outer peripheral surface of the transmission sleeve, and an external spline gear ring is integrally formed on the armature; the internal spline gear ring and the external spline gear ring form a spline pair with axial sliding fit; a clutch armature and a main rotating gear ring are installed on the rotor disc; a secondary transmission gear ring is sleeved on the outer peripheral surface of the armature; transmission teeth are respectively arranged on the right end face of the main rotating gear ring and the left end face of the secondary transmission gear ring; a reset mechanism is arranged between the internal spline gear ring and the armature.

[0007] Preferably, the reset mechanism includes: support rods, a plurality of support rods are annularly and evenly distributed on the outer peripheral surface of the internal spline gear ring; a spring mounting rod, the spring mounting rod slidably penetrates through the support rods, and the rear end of the spring mounting rod is connected to the armature; a stop head is arranged at the front end of the spring mounting rod; a return spring, the return spring is sleeved on the spring mounting rod, and the rear end of the return spring abuts against the support rod, and the front end abuts against the stop head of the spring mounting rod.

[0008] Preferably, the rotor disc includes a central sleeve, an outer ring body, and a plurality of spokes connecting the outer ring body and the central sleeve; a weight reduction hole is formed between adjacent two spokes.

[0009] Preferably, the rotor disc further includes a concentrically arranged armature cup outer ring and an armature cup inner ring, Inner Ring of Armature Cup which is arranged inside the armature cup outer ring; and both the armature cup outer ring and the armature cup inner ring are fixedly connected to the front side surface of the spokes; an armature sheath is installed between the armature cup outer ring and the armature cup inner ring, and the clutch armature is installed in the armature sheath; the main rotating gear ring is sleeved on the outer peripheral surface of the armature cup outer ring.

[0010] Preferably, the rotor assembly further includes permanent magnets; a plurality of the permanent magnets are annularly distributed on the outer peripheral surface of the outer ring body and then a permanent magnet sheath is sleeved; rotor end plates are respectively arranged on the front and rear end faces of the outer ring body, and the two rotor end plates clamp the permanent magnets and the permanent magnet sheath inside.

[0011] Preferably, the stator assembly includes a housing, a stator core disposed on the inner wall of the housing, and an armature winding mounted on the stator core; a front end cover is fixedly installed at the front end of the housing, and a rear end cover is fixedly installed at the rear end; the rear end face of the support shaft abuts against the rear end cover, and the rear end cover and the support shaft are fixedly connected by screws; a rear bearing mounting ring is integrally formed on the front side face of the rear end cover, and a rear bearing is installed in the rear bearing mounting ring; the inner ring of the rear bearing is sleeved on the central sleeve; the transmission sleeve passes through the central hole of the front end cover, a front bearing mounting ring is integrally formed on the rear side face of the front end cover, and a front bearing is installed in the front bearing mounting ring; the inner ring of the front bearing is sleeved on the transmission sleeve.

[0012] Preferably, a support ring is sleeved on the outer peripheral surface of the rear half section of the central sleeve; a tracking magnet mounting ring and an insulating ring are spacedly sleeved outside the support ring; a motor position sensor is installed on the rear end cover, a tracking magnet is provided on the tracking magnet mounting ring for providing an induction magnetic field to the motor position sensor; a slip ring guide ring is provided on the insulating ring, and the slip ring guide ring is connected to the clutch armature.

[0013] Preferably, the motor position sensor is a Hall magnetic sensor.

[0014] Preferably, the central sleeve is sleeved on the support shaft, and two first bearings are provided between the central sleeve and the support shaft; two second bearings are provided between the transmission sleeve and the support shaft.

[0015] Preferably, a first shaft sleeve and a second shaft sleeve are sleeved on the support shaft; both ends of the first shaft sleeve abut against the inner rings of the two first bearings respectively; both ends of the second shaft sleeve abut against the inner rings of the two second bearings respectively.

[0016] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0017] (1) The assembly structure provided by the present invention forms a spline pair with axial sliding fit by using the internal spline tooth ring on the outer peripheral surface of the transmission sleeve and the external spline tooth ring on the armature. At the same time, the clutch armature is installed on the rotor disk of the rotor assembly. Therefore, while the rotor assembly serves as the motor rotor, it also integrates the armature of the electromagnetic clutch, forming an integrated structure of a permanent magnet brushless motor and an electromagnetic clutch, that is, integrating the input end of the electromagnetic clutch with the permanent magnet brushless motor, and using the armature to form the magnetic circuit and output of the clutch at the output end. When the clutch armature is in the energized state, a suction force is formed on the armature, causing the armature to move backward. At this time, the main rotating tooth ring and the secondary transmission tooth ring mesh with each other. Therefore, the rotational movement of the rotor assembly is transmitted to the armature through the meshing main rotating tooth ring and secondary transmission tooth ring, thereby driving the armature to rotate. Since the external spline tooth ring on the armature matches and drives the internal spline tooth ring on the outer peripheral surface of the transmission sleeve, the rotational movement is transmitted to the transmission sleeve, driving the transmission sleeve to rotate. When the clutch armature is in the de-energized state, the clutch armature loses suction force and, under the action of the reset mechanism, drives the armature to move forward for reset. At this time, the main rotating tooth ring and the secondary transmission tooth ring disengage from each other, disconnecting the transmission. Therefore, in the present invention, the rotor disk of the motor shares the magnetic yoke of the armature winding of the electromagnetic clutch, improving the power density and torque density of the motor and electromagnetic clutch assembly system, and using the electromagnetic clutch to improve the reliability of the system.

[0018] (2) The assembly structure provided by the present invention realizes the high integration of a permanent magnet brushless motor and an electromagnetic clutch, reduces the space occupation, and improves the torque power density of the motor and the electromagnetic clutch. This assembly structure can be applied to occasions such as automotive wheel hubs and aircraft landing gears with a stationary central axis support, realizing a simplified structure, enhancing the inheritance of the original structure, and reducing the change of the original support structure layout. This assembly structure can achieve a large torque output with high torque density under high-reliability clutch, and realize transmission and electrical isolation through a high-reliability mechanical clutch.

[0019] (3) In the present invention, the clutch armature is integrally installed at the front end of the rotor disk, and an insulating ring and a slip ring guide ring are installed on the outer peripheral surface of the rear half section of the central sleeve of the rotor disk to energize the rotating armature of the electromagnetic clutch. At the same time, the motor position sensor is integrated on the rear end cover of the motor, making full use of the motor space.

[0020] (4) In the present invention, the rotor disk is of a spoke-like structure, and a weight reduction hole is formed between adjacent two spokes to reduce the weight of the motor rotor. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 A cross-sectional view of the assembly structure provided by the present invention;

[0023] Figure 2 is Figure 1 an enlarged view of part A in

[0024] Figure 3 A schematic exploded view of the assembly structure provided by the present invention;

[0025] Figure 4 A cross-sectional view of the rotor assembly cooperating with the clutch armature in the present invention;

[0026] Figure 5 A schematic exploded view of the rotor assembly and the clutch armature in the present invention.

[0027] Explanation of the reference numerals in the drawings: 1. Housing; 2. Stator core; 3. Armature winding; 4. Rotor disc; 4a. Outer ring body; 4b. Spoke; 4c. Central sleeve; 4d. Outer ring of the armature cup; 4e. Inner ring of the armature cup; 5. Sub-drive gear ring; 6. Clutch armature; 7. Armature; 7a. External spline gear ring; 8. Return spring; 9. Front bearing; 10. Drive sleeve; 10a. Internal spline gear ring; 11. First bearing; 12. Support shaft; 13. First shaft sleeve; 14. Second bearing; 15. Support rod; 16. Spring mounting rod; 17. Main drive gear ring; 18. Front end cover; 18a. Front bearing mounting ring; 19. Permanent magnet sheath; 20. Rear end cover; 20a. Rear bearing mounting ring; 21. Permanent magnet; 22. Armature sheath; 23. Motor position sensor; 24. Support ring; 25. Screw; 26. Rear bearing; 27. Tracking magnet mounting ring; 28. Tracking magnet; 29. Insulating ring; 30. Slip ring guide ring; 31. Rotor end plate; 32. Second shaft sleeve. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] As shown in the attached drawings, this embodiment provides an assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch, including a stator assembly and a rotor assembly of the permanent magnet brushless motor; the rotor assembly is arranged inside the stator assembly; it also includes a support shaft 12 and a transmission sleeve 10; the rotor assembly includes a rotor disc 4; the rotor disc 4 and the transmission sleeve 10 are sequentially and rotatably installed on the support shaft 12 from back to front; an internal spline tooth ring 10a is integrally formed on the outer peripheral surface of the transmission sleeve 10; an armature 7 is slidably sleeved on the outer peripheral surface of the transmission sleeve 10, and an external spline tooth ring 7a is integrally formed on the armature 7; the internal spline tooth ring 10a and the external spline tooth ring 7a form a spline pair with axial sliding fit; a clutch armature 6 and a main rotating tooth ring 17 are installed on the rotor disc 4; a secondary transmission tooth ring 5 is sleeved on the outer peripheral surface of the armature 7; transmission teeth are respectively arranged on the right end face of the main rotating tooth ring 17 and the left end face of the secondary transmission tooth ring 5; a reset mechanism is arranged between the internal spline tooth ring 10a and the armature 7. An external spline is arranged on the outer peripheral surface of the output end of the transmission sleeve 10.

[0032] By adopting the above structure, when the clutch armature 6 is energized, the clutch armature 6 generates a magnetic field by using the electromagnetic coil, forming a suction force on the armature 7 to make the armature 7 move backward. At this time, the main rotating gear ring 17 and the auxiliary transmission gear ring 5 are engaged with each other. Therefore, the rotational movement of the rotor assembly is transmitted to the armature 7 through the engaged main rotating gear ring 17 and auxiliary transmission gear ring 5, and then drives the armature 7 to rotate. Since the external spline gear ring 7a on the armature 7 is engaged with the internal spline gear ring 10a on the outer peripheral surface of the transmission sleeve 10, the rotational movement is transmitted to the transmission sleeve 10, driving the transmission sleeve 10 to rotate. When the clutch armature 6 is de-energized, the clutch armature 6 loses suction force, and under the action of the reset mechanism, it drives the armature 7 to move forward for reset. At this time, the main rotating gear ring 17 and the auxiliary transmission gear ring 5 are disengaged from each other, disconnecting the transmission. In this assembly structure, the rotor disk 4 of the motor shares the armature winding yoke of the electromagnetic clutch, improving the power density and torque density of the motor and electromagnetic clutch assembly system, and using the electromagnetic clutch to improve the reliability of the system.

[0033] Combined Figure 1 As shown, the reset mechanism includes: a support rod 15, and multiple support rods 15 are evenly distributed in a ring on the outer peripheral surface of the internal spline gear ring 10a; a spring mounting rod 16, the spring mounting rod 16 is slidably inserted through the support rod 15, and the rear end of the spring mounting rod 16 is connected to the armature 7; a stop head 16a is provided at the front end of the spring mounting rod 16; a reset spring 8, the reset spring 8 is sleeved on the spring mounting rod 16, and the rear end of the reset spring 8 abuts against the support rod 15, and the front end abuts against the stop head 16a of the spring mounting rod 16. The working principle of the above reset mechanism is: when the clutch armature 6 is energized, a suction force is formed on the armature 7 to make the armature 7 move backward. At this time, the elastic force of the reset spring 8 is overcome, so that the reset spring 8 is compressed, and the main rotating gear ring 17 and the auxiliary transmission gear ring 5 are engaged with each other. When the clutch armature 6 is de-energized, the clutch armature 6 loses suction force, and under the elastic force of the reset spring 8, the armature 7 moves forward for reset. At this time, the main rotating gear ring 17 and the auxiliary transmission gear ring 5 are disengaged from each other, disconnecting the transmission.

[0034] In this embodiment, the clutch armature 6 and the armature 7 are the main actuating components of the electromagnetic clutch, and the reset spring 8 in the reset mechanism provides the reset elastic force. The electromagnetic coil in the clutch armature 6 generates a magnetic field, and the electromagnetic clutch is disengaged and engaged based on the magnetic field suction force and the elastic force of the reset spring 8.

[0035] In this embodiment, the rotor disk 4 includes a central sleeve 4c, an outer ring body 4a, and multiple spokes 4b connecting the outer ring body 4a and the central sleeve 4c; a weight reduction hole is formed between adjacent two spokes 4b.

[0036] The rotor disk 4 further includes a concentrically arranged outer armature cup ring 4d and an inner armature cup ring 4e. The inner armature cup ring 4e is arranged inside the outer armature cup ring 4d. Both the outer armature cup ring 4d and the inner armature cup ring 4e are fixedly connected to the front side surface of the spoke 4b. An armature sheath 22 is installed between the outer armature cup ring 4d and the inner armature cup ring 4e. The clutch armature 6 is installed inside the armature sheath 22. The main rotating gear ring 17 is sleeved on the outer peripheral surface of the outer armature cup ring 4d. This structure is conducive to realizing the reuse of the rotor disk 4 and the magnetic yoke of the electromagnetic clutch armature, simplifying the structure of the motor and the electromagnetic clutch, and improving the torque density of the system.

[0037] Combined with Figure 4 、 Figure 5 As shown, the rotor assembly further includes permanent magnets 21. After a plurality of the permanent magnets 21 are annularly distributed on the outer peripheral surface of the outer ring body 4a, a permanent magnet sheath 19 is sleeved thereon. Specifically, the permanent magnets 21 are surface-mounted on the outer peripheral surface of the outer ring body 4a. Rotor end plates 31 are respectively arranged on the front and rear end faces of the outer ring body 4a. The two rotor end plates 31 clamp the permanent magnets 21 and the permanent magnet sheath 19 therein. By providing the rotor end plates 31, axial limitation of the permanent magnets 21 can be achieved.

[0038] Combined with Figure 1 As shown, the stator assembly includes a machine shell 1, a stator core 2 arranged on the inner wall of the machine shell 1, and an armature winding 3 installed on the stator core 2. A front end cover 18 is fixedly installed at the front end of the machine shell 1, and a rear end cover 20 is fixedly installed at the rear end. The rear end face of the support shaft 12 abuts against the rear end cover 20, and the rear end cover 20 and the support shaft 12 are fixedly connected by screws 25. A rear bearing mounting ring 20a is integrally formed on the front side surface of the rear end cover 20, and a rear bearing 26 is installed in the rear bearing mounting ring 20a. The inner ring of the rear bearing 26 is sleeved on the central sleeve 4c. The transmission sleeve 10 passes through the central hole of the front end cover 18. A front bearing mounting ring 18a is integrally formed on the rear side surface of the front end cover 18, and a front bearing 9 is installed in the front bearing mounting ring 18a. The inner ring of the front bearing 9 is sleeved on the transmission sleeve 10.

[0039] Furthermore, a support ring 24 is sleeved on the outer peripheral surface of the rear half section of the central sleeve 4c. A tracking magnet mounting ring 27 and an insulating ring 29 are spacedly sleeved outside the support ring 24. A motor position sensor 23 is installed on the rear end cover 20. A tracking magnet 28 is arranged on the tracking magnet mounting ring 27 for providing an induction magnetic field to the motor position sensor 23. A slip ring guide ring 30 is arranged on the insulating ring 29, and the slip ring guide ring 30 is connected to the clutch armature 6 to supply power to the clutch armature 6 by using the slip ring guide ring 30.

[0040] In this embodiment, the motor position sensor 23 is a Hall magnetic sensor. The motor position sensor 23 can also be a resolver and an optical encoder, not limited to the Hall magnetic sensor.

[0041] Combined with Figure 1 As shown, the central sleeve 4c is sleeved on the support shaft 12, and two first bearings 11 are arranged between the central sleeve 4c and the support shaft 12; two second bearings 14 are arranged between the transmission sleeve 10 and the support shaft 12. Further, a first shaft sleeve 13 and a second shaft sleeve 32 are sleeved on the support shaft 12; both ends of the first shaft sleeve 13 respectively abut against the inner rings of the two first bearings 11; both ends of the second shaft sleeve 32 respectively abut against the inner rings of the two second bearings 14.

[0042] The assembly structure of the compact permanent magnet brushless motor and the electromagnetic clutch provided in this embodiment has the following specific installation steps:

[0043] S1. Installation of the permanent magnet brushless motor stator assembly

[0044] Install the armature winding 3 on the stator core 2, and then press it into the machine shell 1 to form the stator assembly of the permanent magnet brushless motor.

[0045] S2. Installation of the permanent magnet brushless motor rotor assembly

[0046] Install the permanent magnet 21 on the outer peripheral surface of the outer ring body 4a of the rotor disc 4, and sleeve the permanent magnet sheath 19. Then, rotor end plates 31 are respectively arranged on the front and rear end faces of the outer ring body 4a to axially limit the permanent magnet 21. A support ring 24 is sleeved on the outer peripheral surface of the rear half section of the central sleeve 4a of the rotor disc 4. A tracking magnet mounting ring 27 and an insulating ring 29 are spaced and sleeved outside the support ring 24. A tracking magnet 28 is installed on the tracking magnet mounting ring 27; a slip ring guide ring 30 is installed on the insulating ring 29. Install the armature sheath 22 between the two reinforcing rings of the rotor disc 4, and install the clutch armature 6 in the armature sheath 22, connecting the slip ring guide ring 30 and the clutch armature 6. Sleeve the main driving gear ring 17 on the outer peripheral surface of the outer ring 4d of the armature cup.

[0047] S3. Installation of the electromagnetic clutch assembly

[0048] Press the secondary transmission gear ring 5 made of wear-resistant material onto the outer peripheral surface of the armature 7, and slide the armature 7 on the outer cylindrical surface at the rear end of the transmission sleeve 10, and make the external spline gear ring 7a of the armature 7 insert into the internal spline gear ring 10a of the transmission sleeve 10 to form a spline pair that can axially slide and cooperate.

[0049] The return spring 8 is sleeved on the spring mounting rod 16. The spring mounting rod 16 passes through the support rod 15 and then is connected to the armature 7. The return spring 8, the support rod 15 and the spring mounting rod 16 together form a return mechanism.

[0050] S4. Installation of the assembly structure

[0051] Install two first bearings 11 and two second bearings 14 on the support shaft 12. The two first bearings 11 are separated by a first bushing 13, and the two second bearings 14 are separated by a second bushing 32. Install the rotor assembly of the permanent magnet brushless motor on the two first bearings 11 of the support shaft 12 to complete the installation of the rotor assembly. Install the stator assembly of the permanent magnet brushless motor outside the rotor assembly. Install the rear end cover 20 with the motor position sensor 23 and the rear bearing 26 on the central shaft 12 through screws 25, and the rear end cover 20 is fixed to the housing 1 of the stator assembly by bolts.

[0052] Install the drive sleeve 10 with the wedge 7 installed thereon on the two second bearings 14, and sleeved the front end cover 18 with the front bearing 9 on the drive sleeve 10. The front end cover 18 is fixed to the housing 1 of the stator assembly by bolts.

[0053] By adopting the above steps, the installation of the assembly structure of the permanent magnet brushless motor and the electromagnetic clutch is completed.

[0054] Application example:

[0055] When the above-mentioned assembly structure is applied to the aircraft landing gear, the straight shaft of the aircraft landing gear serves as the stationary support shaft 12. The housing 1 of the motor is installed and fixed on the vertical shaft of the landing gear. The external spline at the output end of the drive sleeve 10 is connected to the internal spline of the aircraft wheel hub to form the drive of the aircraft landing gear. Specifically, when the assembly structure is applied to the aircraft landing gear, the outer diameter of the rotor assembly is 260 mm, the axial length of the permanent magnet 21 is 32 mm, the thickness of the outer ring body 4a of the rotor disk 4 is 5 mm, the width of the spoke 4b is 6 mm, and the motor position sensor 23 adopts a Hall position sensor. The winding yoke of the clutch armature 6 is 5 mm high, the armature winding has 20 turns, and the wire diameter of the coil is 1 mm.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. The assembly structure of a compact permanent magnet brushless motor and an electromagnetic clutch, comprising a stator assembly and a rotor assembly of the permanent magnet brushless motor; the rotor assembly is arranged inside the stator assembly; it is characterized in that, It also includes a support shaft (12) and a transmission sleeve (10); the rotor assembly includes a rotor disc (4); The rotor disc (4) and the transmission sleeve (10) are sequentially and rotatably mounted on the support shaft (12) from back to front; An internal spline gear ring (10a) is integrally formed on the outer peripheral surface of the transmission sleeve (10); an armature (7) is slidably sleeved on the outer peripheral surface of the transmission sleeve (10), and an external spline gear ring (7a) is integrally formed on the armature (7); the internal spline gear ring (10a) and the external spline gear ring (7a) form a spline pair with axial sliding fit; A clutch armature (6) and a main rotating gear ring (17) are mounted on the rotor disc (4); A secondary transmission gear ring (5) is sleeved on the outer peripheral surface of the armature (7); transmission teeth are respectively arranged on the right end face of the main rotating gear ring (17) and the left end face of the secondary transmission gear ring (5); A reset mechanism is arranged between the internal spline gear ring (10a) and the armature (7).

2. The assembly structure according to claim 1, characterized in that, The reset mechanism includes: Support rods (15), and multiple support rods (15) are annularly and evenly distributed on the outer peripheral surface of the internal spline gear ring (10a); A spring mounting rod (16), the spring mounting rod (16) is slidably inserted through the support rod (15), and the rear end of the spring mounting rod (16) is connected to the armature (7); a stop head (16a) is arranged at the front end of the spring mounting rod (16); A reset spring (8), the reset spring (8) is sleeved on the spring mounting rod (16), and the rear end of the reset spring (8) abuts against the support rod (15), and the front end abuts against the stop head (16a) of the spring mounting rod (16).

3. The assembly structure according to claim 1, characterized in that, The rotor disc (4) includes a central sleeve (4c), an outer ring body (4a), and multiple spokes (4b) connecting the outer ring body (4a) and the central sleeve (4c); a weight reduction hole is formed between adjacent two spokes (4b).

4. The assembly structure according to claim 3, characterized in that, The rotor disc (4) further includes a concentrically arranged armature cup outer ring (4d) and an armature cup inner ring (4e), and the armature cup inner ring (4e) is arranged inside the armature cup outer ring (4d); and both the armature cup outer ring (4d) and the armature cup inner ring (4e) are fixedly connected to the front side surface of the spoke (4b); An armature sheath (22) is installed between the armature cup outer ring (4d) and the armature cup inner ring (4e), and the clutch armature (6) is installed in the armature sheath (22); The main rotating gear ring (17) is sleeved on the outer peripheral surface of the armature cup outer ring (4d).

5. The assembly structure according to claim 3, characterized in that, The rotor assembly further includes permanent magnets (21); multiple permanent magnets (21) are annularly distributed on the outer peripheral surface of the outer ring body (4a), and then a permanent magnet sheath (19) is sleeved; rotor end plates (31) are respectively arranged on the front and rear end faces of the outer ring body (4a), and the two rotor end plates (31) clamp the permanent magnets (21) and the permanent magnet sheath (19) inside.

6. The assembly structure according to claim 3, wherein, The stator assembly includes a machine shell (1), a stator core (2) arranged on the inner wall of the machine shell (1), and an armature winding (3) installed on the stator core (2); A front end cover (18) is fixedly installed at the front end of the housing (1), and a rear end cover (20) is fixedly installed at the rear end. The rear end face of the support shaft (12) abuts against the rear end cover (20), and the rear end cover (20) and the support shaft (12) are fixedly connected by screws (25). A rear bearing mounting ring (20a) is integrally formed on the front side face of the rear end cover (20), and a rear bearing (26) is installed in the rear bearing mounting ring (20a); the inner ring of the rear bearing (26) is sleeved on the central sleeve (4c). The transmission sleeve (10) passes through the central hole of the front end cover (18). A front bearing mounting ring (18a) is integrally formed on the rear side face of the front end cover (18), and a front bearing (9) is installed in the front bearing mounting ring (18a); the inner ring of the front bearing (9) is sleeved on the transmission sleeve (10).

7. The assembly structure according to claim 6, wherein, A support ring (24) is sleeved on the outer peripheral surface of the rear half section of the central sleeve (4c); a tracking magnet mounting ring (27) and an insulating ring (29) are spacedly sleeved outside the support ring (24). A motor position sensor (23) is installed on the rear end cover (20), and a tracking magnet (28) is arranged on the tracking magnet mounting ring (27) for providing an induction magnetic field to the motor position sensor (23). A slip ring guide ring (30) is arranged on the insulating ring (29), and the slip ring guide ring (30) is connected to the clutch armature (6).

8. The assembly structure according to claim 7, wherein, The motor position sensor (23) is a Hall magnetic sensor.

9. The assembly structure according to claim 3, characterized in that The central sleeve (4c) is sleeved on the support shaft (12), and two first bearings (11) are arranged between the central sleeve (4c) and the support shaft (12); two second bearings (14) are arranged between the transmission sleeve (10) and the support shaft (12).

10. The assembly structure according to claim 9, characterized in that, A first shaft sleeve (13) and a second shaft sleeve (32) are sleeved on the support shaft (12). Both ends of the first shaft sleeve (13) respectively abut against the inner rings of the two first bearings (11). Both ends of the second shaft sleeve (32) respectively abut against the inner rings of the two second bearings (14).

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