Double-headed stepless variable speed brushless motor

Abstract

This invention relates to the field of automotive air conditioning blower technology, specifically to a dual-head continuously variable brushless motor. It includes a housing, a brushless motor mounted on the housing, and a driver. The output end of the brushless motor is equipped with a continuously variable transmission mechanism, and the brushless motor is connected to a power output mechanism via the continuously variable transmission mechanism. The power output mechanism consists of a second output shaft, a third output shaft, and a drive assembly that drives the extension and retraction of the third output shaft. By providing two output shafts (second and third), dual-head output is achieved. When a low airflow is required, there is no need to change the speed of the brushless motor; simply disconnecting the synchronous connection between the third and second output shafts allows the second output shaft to drive only one impeller, thus reducing the airflow while ensuring the brushless motor does not need to operate at low speeds, solving the problems caused by low-speed operation.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning blower technology, specifically to a dual-head continuously variable brushless motor. Background Technology

[0002] The vehicle air conditioning system mainly consists of a cooling module and an air supply module. The air supply module is responsible for delivering the cold air generated by the cooling module or the hot air emitted by the engine into the vehicle for cooling or heating. The stability of the air supply, the control of air supply noise, and the air volume are all key factors that affect the design of the air supply module.

[0003] The main component of the air supply module is the blower, which consists of a motor and an impeller. Currently, the motors used in automotive blowers are mainly brushed motors and brushless motors.

[0004] The speed control of brushless motors is electronic, which offers a higher range and precision. However, brushless motors suffer from significant vibration when operating at low speeds. To address this, Chinese Patent Publication No. CN113014031A discloses a brushless motor base structure and a brushless motor, including a brushless motor body. The two ends of the protective shell of the brushless motor body are horizontally and symmetrically welded with positioning hole plates, and multiple positioning hole plates are evenly arranged along the circumference of the protective shell of the brushless motor body. Rubber rings are bonded to the through holes of the positioning hole plates. The system also includes a shock-absorbing structure, which is located on the side of the brushless motor body away from the output end.

[0005] The solution is to add a shock-absorbing structure. However, this solution also creates new problems. First, external shock absorption increases the overall space occupied by the motor, which will increase the overall area occupied by the vehicle air conditioner. Second, when the brushless motor rotates at low speed, the torque is low and is directly output to the impeller, which will result in insufficient impeller speed and insufficient air volume. Summary of the Invention

[0006] Technical problems to be solved

[0007] To address the aforementioned shortcomings of existing technologies, this invention provides a dual-head continuously variable brushless motor, which effectively solves the problem that in existing technologies, low torque during low-speed rotation leads to insufficient impeller speed and consequently insufficient airflow.

[0008] Technical solution

[0009] To achieve the above objectives, the present invention provides the following technical solution: without reducing the brushless motor speed, the number of output shafts is changed to address the problem of low-speed operation of the brushless motor.

[0010] This invention provides a dual-head continuously variable brushless motor, including a housing, a brushless motor and a driver mounted on the housing. The output end of the brushless motor is equipped with a continuously variable transmission mechanism, and the brushless motor is connected to a power output mechanism through the continuously variable transmission mechanism. The power output mechanism consists of a second output shaft, a third output shaft, and a drive assembly for driving the extension and retraction of the third output shaft. One end of the second output shaft is rotatably connected to the housing, and the other end of the second output shaft has a first stepped groove. A first tooth block is uniformly fixed in a ring shape in the first stepped groove, and a second tooth block that mates with the first tooth block is uniformly fixed in a ring shape on the outer surface of the third output shaft. The third output shaft is movably connected to the second output shaft. The drive assembly consists of a fixed frame, an electromagnet, a first guide rod, a return spring, and a connecting frame. The fixed frame is fixed to the housing, and the connecting frame is sleeved on the third output shaft. The connecting frame is connected to the fixed frame through the first guide rod. The electromagnet and the return spring are both sleeved on the first guide rod.

[0011] Furthermore, the brushless motor consists of a motor housing, a stator, a rotor, and a first output shaft. The motor housing is fixed on the outer casing, and the two ends of the first output shaft are rotatably connected to the motor housing and the outer casing, respectively. The rotor is sleeved and fixed on the first output shaft, and the stator is fixed on the inner wall of the motor housing.

[0012] Furthermore, the continuously variable transmission (CVT) mechanism consists of a synchronous pulley set, a synchronous belt, and an adjusting assembly. There are two synchronous pulley sets, each consisting of a fixed conical pulley and a movable conical pulley. The two synchronous pulley sets are respectively mounted on the first output shaft and the second output shaft. The fixed conical pulleys in the two synchronous pulley sets are respectively fixed on the first output shaft and the second output shaft, and the movable conical pulleys in the two synchronous pulley sets are respectively slidably connected to the first output shaft and the second output shaft. The two ends of the synchronous belt are respectively fitted onto the two synchronous pulley sets, and the adjusting assembly is located between the two synchronous pulley sets.

[0013] Furthermore, the pitch adjustment assembly includes a support frame and a stepper motor. One end of the support frame is fixed to the outer shell, and the other end of the support frame is fixed to a sleeve. The sleeve is hollow inside, and a through groove is provided at the connection between the sleeve and the support frame. A reciprocating lead screw is rotatably connected inside the sleeve. Push plates are fixed at both ends of the reciprocating lead screw. A threaded sleeve is fitted on the outer surface of the reciprocating lead screw, and the threaded sleeve is threadedly connected to the reciprocating lead screw. The stepper motor is fixed inside the support frame, and a drive gear is fixed at the output end of the stepper motor, and the drive gear meshes with the threaded sleeve.

[0014] Furthermore, the ends of the two push plates away from the reciprocating lead screw are respectively sleeved on the first output shaft and the second output shaft, and the ends of the two push plates away from the reciprocating lead screw are both provided with grooves, with cover plates embedded inside the grooves. The two cover plates are respectively sleeved on the first output shaft and the second output shaft, and the cover plates are provided with uniformly spaced through holes in a ring shape. Ball bearings are rotatably connected in the through holes, and the ball bearings on the two push plates abut against the two movable conical wheels respectively.

[0015] Furthermore, a guide hole is provided through the outer surface of the push plate, and a second guide rod is slidably connected in the guide hole, with the end of the second guide rod fixed to the outer shell.

[0016] Furthermore, the outer casing is composed of a mounting plate, a first cover, and a second cover, with the continuously variable transmission mechanism and the power output mechanism respectively located inside the first cover and the second cover.

[0017] Furthermore, a linear bearing is fitted onto the outer surface of the third output shaft, the linear bearing is fixed on a mounting bracket, and the third output shaft is slidably connected to the linear bearing.

[0018] Furthermore, the connecting frame consists of a deep groove ball bearing and connecting blocks fixed on both sides of the deep groove ball bearing. The connecting blocks are slidably connected to the first guide rod. The electromagnet is fixed on the fixed frame, and the two ends of the return spring abut against the electromagnet and the connecting blocks respectively. The third output shaft is rotatably connected to the deep groove ball bearing.

[0019] Beneficial effects

[0020] The technical solution provided by this invention has the following advantages compared with known public technologies:

[0021] By providing two output shafts, a second and a third, dual-head output is achieved. The third output shaft is telescopically connected to the second output shaft. Through a drive assembly, the third output shaft is driven to retract into the housing, allowing it to rotate together with the second output shaft. Under normal conditions, the third output shaft remains stationary, relying solely on the second output shaft for air delivery. This provides new air outlet design conditions for automotive blowers. An impeller can be mounted on each of the second and third output shafts. When a small air volume is required, there is no need to change the speed of the brushless motor. Simply disconnect the synchronous connection between the third and second output shafts, and the second output shaft alone drives one impeller to rotate, thereby reducing the air volume. At the same time, it ensures that the brushless motor does not need to operate at low speed, solving the problems caused by low-speed operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a side view of the structure of the present invention;

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of cross-section at point AA;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 This is an exploded view of the structure of the present invention;

[0028] Figure 6 This is a partial schematic diagram of the structure of the present invention in the form of an explosion.

[0029] Figure 7 For the present invention Figure 5 Exploded view of the structure of the mid-pitch adjustment component;

[0030] Figure 8 For the present invention Figure 5 Cross-sectional schematic diagram of the second and third output shafts.

[0031] The labels in the diagram represent: 1. Housing; 2. Brushless motor; 201. Motor housing; 202. Stator; 203. Rotor; 204. First output shaft; 3. Driver; 4. Fixed conical wheel; 5. Movable conical wheel; 6. Synchronous belt; 7. Adjustable pitch assembly; 71. Support frame; 72. Sleeve; 73. Threaded sleeve; 74. Reciprocating lead screw; 75. Stepper motor; 76. Drive gear; 77. Push plate; 78. Cover plate; 79. Ball bearing; 8. Second output shaft; 9. Third output shaft; 10. Deep groove ball bearing; 11. Fixing frame; 12. Linear bearing; 13. Electromagnet; 14. First guide rod; 15. Return spring; 16. Connecting block. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to embodiments.

[0034] Example: A dual-head continuously variable brushless motor includes a housing 1, a brushless motor 2 mounted on the housing 1, and a driver 3. The driver 3 controls the brushless motor 2. The brushless motor 2 consists of a motor housing 201, a stator 202, a rotor 203, and a first output shaft 204. The motor housing 201 is fixed to the housing 1. The two ends of the first output shaft 204 are rotatably connected to the motor housing 201 and the housing 1, respectively. The rotor 203 is sleeved and fixed on the first output shaft 204. The stator 202 is fixed on the inner wall of the motor housing 201. The stator 202 is stationary, and the rotor 203 drives the first output shaft 204 to rotate. The position of the magnetic poles of the rotor 203 is sensed by a Hall element. Based on this sensing, the driver 3 can switch the direction of the current in the stator 202 in a timely manner to ensure that the correct magnetic force is generated to drive the rotor 203 to rotate. The working principle of the brushless motor 2 and the control principle of the driver 3 are known and publicly available technologies, and will not be elaborated further here.

[0035] In order for the dual-head continuously variable brushless motor to drive the two impellers in the car hair dryer, a continuously variable transmission mechanism is installed at the end of the brushless motor 2. The brushless motor 2 is connected to a power output mechanism through the continuously variable transmission mechanism. The power output mechanism consists of a second output shaft 8, a third output shaft 9 and a drive component that can drive the third output shaft 9 to extend and retract within the second output shaft 8. The middle part of the second output shaft 8 is a hollow structure. The third output shaft 9 can extend, retract or rotate within the second output shaft 8. An impeller can be installed on the second output shaft 8 and the third output shaft 9 respectively.

[0036] Simultaneously, the third output shaft 9 can also rotate synchronously with the second output shaft 8. To achieve this effect, one end of the second output shaft 8 is rotatably connected to the outer casing 1, and the other end of the second output shaft 8 is provided with a first stepped groove. A first tooth block is uniformly fixed in a ring within the first stepped groove, and a second tooth block that mates with the first tooth block is uniformly fixed in a ring on the outer surface of the third output shaft 9. Figure 8 As shown, when the second tooth block on the third output shaft 9 meshes with the first tooth block on the second output shaft 8, the third output shaft 9 can rotate synchronously with the second output shaft 8;

[0037] like Figure 4 and Figure 6 As shown, the drive assembly consists of a fixed frame 11, an electromagnet 13, a first guide rod 14, a return spring 15, and a connecting frame. The fixed frame 11 is fixed on the outer shell 1, and the connecting frame is sleeved on the third output shaft 9. The connecting frame is connected to the fixed frame 11 through the first guide rod 14. The electromagnet 13 and the return spring 15 are both sleeved on the first guide rod 14. Under normal conditions, the electromagnet 13 is not energized. At this time, the second tooth block on the third output shaft 9 meshes with the first tooth block on the second output shaft 8. Therefore, the second output shaft 8 can drive the third output shaft 9 to rotate. However, when the brushless motor 2 has just started or needs to rotate at low speed, the output torque of the brushless motor 2 is small. By energizing the electromagnet 13 to attract the return spring 15, the connecting frame moves towards the fixed frame 11, thereby pushing the third output shaft 9, causing the second tooth block to move away from the first tooth block, and allowing the second output shaft 8 to work independently.

[0038] Specifically, the connecting frame consists of a deep groove ball bearing 10 and connecting blocks 16 fixed on both sides of the deep groove ball bearing 10. The connecting blocks 16 are slidably connected to the first guide rod 14. The electromagnet 13 is fixed on the fixed frame 11, and the two ends of the return spring 15 abut against the electromagnet 13 and the connecting blocks 16 respectively. The third output shaft 9 is rotatably connected to the deep groove ball bearing 10 to ensure the rotational stability of the third output shaft 9. A linear bearing 12 is sleeved on the outer surface of the third output shaft 9 to ensure the extension and contraction stability of the third output shaft 9 within the second output shaft 8. The linear bearing 12 is fixed on the fixed frame 11, and the third output shaft 9 is slidably connected to the linear bearing 12.

[0039] It should be noted that the connecting block 16 is made of a material that can be attracted by magnetic force, and the power supply control of the electromagnet 13 can be realized by connecting it to the vehicle computer through a wire.

[0040] Since the speed change of the brushless motor 2 is controlled by the driver 3, the voltage supplied to the stator 202 through the MOSFET increases the magnetic force, thereby changing the speed, which is also known as electronic speed regulation. Once the rated power is exceeded, the output speed of the first output shaft 204 cannot be changed. Furthermore, when the electronic speed regulation controls the speed of the brushless motor 2 too low, it will produce vibration. In order to cooperate with electronic speed regulation and allow the brushless motor 2 to be adjusted not only electronically but also mechanically, a continuously variable transmission (CVT) mechanism is used. The CVT mechanism consists of a synchronous pulley set, a synchronous belt 6, and a pitch adjustment component 7. There are two synchronous pulley sets, each consisting of a fixed conical pulley 4 and a movable conical pulley 5. Figure 3 and Figure 5As shown, two synchronous pulley sets are respectively mounted on the first output shaft 204 and the second output shaft 8. The fixed conical pulleys 4 in the two synchronous pulley sets are respectively fixed on the first output shaft 204 and the second output shaft 8, and the movable conical pulleys 5 in the two synchronous pulley sets are respectively slidably connected to the first output shaft 204 and the second output shaft 8. The two ends of the synchronous belt 6 are respectively sleeved on the two synchronous pulley sets. When the distance between the fixed conical pulley 4 and the movable conical pulley 5 changes, the contact area between the synchronous belt 6 and the fixed conical pulley 4 and the movable conical pulley 5 will change, thus changing the transmission radius. By changing the distance between the fixed conical pulley 4 and the movable conical pulley 5 in the two synchronous pulley sets, speed change can be achieved.

[0041] To facilitate simultaneous control of the distance between the fixed conical wheel 4 and the movable conical wheel 5 in the two synchronous pulley sets, an adjustment assembly 7 is installed between the two synchronous pulley sets. The adjustment assembly 7 includes a support frame 71 and a stepper motor 75. One end of the support frame 71 is fixed to the outer casing 1, and the other end of the support frame 71 is fixed to a sleeve 72. The sleeve 72 is hollow inside, and a through groove is provided at the connection between the sleeve 72 and the support frame 71. A reciprocating lead screw 74 is rotatably connected inside the sleeve 72. Push plates 77 are fixed at both ends of the reciprocating lead screw 74. A threaded sleeve 73 is fitted on the outer surface of the reciprocating lead screw 74, and the threaded sleeve 73 is threadedly connected to the reciprocating lead screw 74. The stepper motor 75 is fixed inside the support frame 71, and a drive gear 76 is fixed at the output end of the stepper motor 75. The drive gear 76 meshes with the thread sleeve 73, and the stepper motor 75 drives the drive gear 76 to rotate clockwise, causing the thread sleeve 73 to drive the reciprocating screw 74 to extend and retract within the sleeve 72. This causes the push plate 77 on the same side as the second output shaft 8 to push the movable conical wheel 5 on the same side, reducing the distance between the fixed conical wheel 4 and the movable conical wheel 5 on the second output shaft 8. Conversely, it can control the distance between the fixed conical wheel 4 and the movable conical wheel 5 on the first output shaft 204 to decrease. Regardless of whether the movable conical wheel 5 on the second output shaft 8 or the first output shaft 204 loses the limit of the push plate 77, the synchronous belt 6 is pulled by the synchronous pulley group on the other side, and the movable conical wheel 5 will move towards the push plate 77 under the action of centrifugal force, thereby completing the transmission of the synchronous pulley group.

[0042] Furthermore, such as Figure 7 As shown, in order to reduce the friction between the push plate 77 and the movable conical wheel 5, the ends of the two push plates 77 away from the reciprocating screw 74 are respectively sleeved on the first output shaft 204 and the second output shaft 8. The ends of the two push plates 77 away from the reciprocating screw 74 are both provided with grooves, and cover plates 78 are embedded in the grooves. The two cover plates 78 are respectively sleeved on the first output shaft 204 and the second output shaft 8. The cover plates 78 are provided with uniformly spaced through holes in a ring shape. Ball bearings 79 are rotatably connected in the through holes. The ball bearings 79 on the two push plates 77 abut against the two movable conical wheels 5, so that the friction between the push plate 77 and the movable conical wheel 5 changes from sliding friction to rolling friction, and the friction is reduced.

[0043] It should be noted that a guide hole (not shown) is provided through the outer surface of the push plate 77, and a second guide rod (not shown) is slidably connected in the guide hole. The end of the second guide rod is fixed to the outer shell 1 to ensure the stability of the translation of the push plate 77. Slide grooves (not shown) are provided at the positions where the first output shaft 204 and the second output shaft 8 are connected to the movable conical wheel 5. A slider (not shown) that matches the slide groove is integrally connected to the inner wall of the movable conical wheel 5, so that the movable conical wheel 5 can slide on the first output shaft 204 or the second output shaft 8, and can also rotate with the two.

[0044] The outer casing 1 consists of a mounting plate, a first cover, and a second cover. The continuously variable transmission mechanism and the power output mechanism are respectively located inside the first cover and the second cover for easy assembly.

[0045] Working principle: During use, the outer casing 1 is connected and fixed to the vehicle blower housing. The driver 3 is electrically connected to the vehicle computer through wires, so that the dual-head continuously variable brushless motor can be controlled by the vehicle computer. The driver 3 controls the brushless motor 2 to be energized, so that the stator 202 is energized and generates magnetic force. Utilizing the principle of like poles repulsion, the rotor 203 can rotate with the first output shaft 204. The control method and the electrical control principle of the driver 3 are known and publicly available technologies, and will not be elaborated on here.

[0046] An impeller is mounted on each of the second output shaft 8 and the third output shaft 9. When low-speed operation is required, the drive component in the power output mechanism operates, energizing the electromagnet 13 to generate magnetic force. This magnetic force attracts the connecting block 16 via the return spring 15, causing the connecting block 16 to move towards the electromagnet 13. The connecting block 16, through the deep groove ball bearing 10, drives the third output shaft 9 to move towards the end of the second output shaft 8, separating the first and second toothed blocks. This keeps the third output shaft 9 stationary, allowing only the second output shaft 8 to rotate, driving a single impeller to rotate and deliver air. Simultaneously, the stepper motor 75 can drive the drive gear 76 to rotate clockwise, thus... The threaded sleeve 73 drives the reciprocating screw 74 to extend and retract within the sleeve 72, causing the push plate 77 on the same side as the second output shaft 8 to push the movable conical wheel 5 on the same side. This reduces the distance between the fixed conical wheel 4 and the movable conical wheel 5 on the second output shaft 8, increasing the contact area between the synchronous belt 6 and the fixed conical wheel 4 and the movable conical wheel 5 on the second output shaft 8. Conversely, the contact area between the other end of the synchronous belt 6 and the fixed conical wheel 4 and the movable conical wheel 5 on the first output shaft 204 decreases, thereby causing the first output shaft 204 to output power. After being reduced in speed by the continuously variable transmission mechanism, the power is delivered to the second output shaft 8, further reducing the impeller speed and thus reducing the air volume.

[0047] When high-speed operation is required, electromagnet 13 is de-energized, and return spring 15 applies return force to connecting block 16. Connecting block 16 drives the third output shaft 9 to reset via deep groove ball bearing 10, causing the first and second gear blocks to mesh. The third output shaft 9 and the second output shaft 8 rotate synchronously, so the impellers work simultaneously, increasing the air volume. At the same time, stepper motor 75 drives drive gear 76 to rotate counterclockwise, causing threaded sleeve 73 to drive reciprocating screw 74 to extend and retract within sleeve 72, thus synchronizing with the first output shaft 204. The push plate 77 on the side pushes the movable conical wheel 5 on the same side, reducing the distance between the fixed conical wheel 4 and the movable conical wheel 5 on the first output shaft 204. This increases the contact area between the synchronous belt 6 and the fixed conical wheel 4 and the movable conical wheel 5 on the first output shaft 204. Conversely, the contact area between the other end of the synchronous belt 6 and the fixed conical wheel 4 and the movable conical wheel 5 on the second output shaft 8 decreases. This causes the first output shaft 204 to output power, which is then accelerated by the continuously variable transmission mechanism and delivered to the second output shaft 8, further increasing the impeller speed.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. Double-head infinitely variable brushless motor, comprising a housing (1) and a brushless motor (2) and a driver (3) mounted on the housing (1), characterized in that, The output end of the brushless motor (2) is equipped with a stepless speed change mechanism, and the brushless motor (2) is connected with a power output mechanism through the stepless speed change mechanism, and the power output mechanism is composed of a second output shaft (8), a third output shaft (9) and a driving assembly for driving the third output shaft (9) to stretch and retract, one end of the second output shaft (8) is rotatably connected with the shell (1), the other end of the second output shaft (8) is provided with a first step groove, a plurality of first tooth blocks are uniformly fixed in the first step groove in a ring shape, and the outer surface of the third output shaft (9) is uniformly fixed with a plurality of second tooth blocks matched with the first tooth blocks, the third output shaft (9) is movably connected with the second output shaft (8), the driving assembly is composed of a fixing frame (11), an electromagnet (13), a first guide rod (14), a return spring (15) and a connecting frame, the fixing frame (11) is fixed on the shell (1), the connecting frame is sleeved on the third output shaft (9), and the connecting frame is connected with the fixing frame (11) through the first guide rod (14), the electromagnet (13) and the return spring (15) are sleeved on the first guide rod (14); The brushless motor (2) is composed of a motor shell (201), a stator (202), a rotor (203) and a first output shaft (204), the motor shell (201) is fixed on the shell (1), both ends of the first output shaft (204) are rotatably connected with the motor shell (201) and the shell (1) respectively, the rotor (203) is sleeved and fixed on the first output shaft (204), and the stator (202) is fixed on the inner wall of the motor shell (201); The stepless speed change mechanism is composed of a synchronous wheel set, a synchronous belt (6) and a distance adjusting assembly (7), the synchronous wheel set is provided with two, and each of the two synchronous wheel sets is composed of a fixed conical wheel (4) and a movable conical wheel (5), the two synchronous wheel sets are respectively arranged on the first output shaft (204) and the second output shaft (8), the fixed conical wheels (4) in the two synchronous wheel sets are respectively fixed on the first output shaft (204) and the second output shaft (8), and the movable conical wheels (5) in the two synchronous wheel sets are respectively slidably connected with the first output shaft (204) and the second output shaft (8), both ends of the synchronous belt (6) are sleeved on the two synchronous wheel sets, and the distance adjusting assembly (7) is located between the two synchronous wheel sets. The distance adjusting assembly (7) comprises a support frame (71) and a stepping motor (75), one end of the support frame (71) is fixed on the shell (1), the other end of the support frame (71) is fixed with a sleeve (72), the inside of the sleeve (72) is hollow, and a through groove is formed at the connecting position between the sleeve (72) and the support frame (71), a reciprocating screw rod (74) is rotatably connected in the sleeve (72), the two ends of the reciprocating screw rod (74) are both fixed with a push plate (77), a silk sleeve (73) is sleeved on the outer surface of the reciprocating screw rod (74), and the silk sleeve (73) is connected with the reciprocating screw rod (74) through threads, the stepping motor (75) is fixed in the support frame (71), the output end of the stepping motor (75) is fixed with a driving gear (76), and the driving gear (76) is engaged with the silk sleeve (73). The two push plates (77) are sleeved on the first output shaft (204) and the second output shaft (8) respectively, and the two push plates (77) are both provided with a recess at the end away from the reciprocating screw rod (74), a cover plate (78) is embedded in the recess, the two cover plates (78) are sleeved on the first output shaft (204) and the second output shaft (8) respectively, and a through hole is uniformly formed in the cover plate (78) in a ring shape, a ball (79) is rotatably connected in the through hole, and the balls (79) on the two push plates (77) are respectively abutted against the two movable bevel gears (5). The connecting frame is composed of a deep groove ball bearing (10) and connecting blocks (16) fixed on both sides of the deep groove ball bearing (10), the connecting blocks (16) are slidably connected with the first guide rods (14), the electromagnet (13) is fixed on the fixed frame (11), and the two ends of the return spring (15) are respectively abutted against the electromagnet (13) and the connecting blocks (16), and the third output shaft (9) is rotatably connected with the deep groove ball bearing (10).

2. The dual head infinitely variable brushless motor of claim 1, wherein, The outer surface of the push plate (77) is provided with a guide hole, and a second guide rod is slidably connected in the guide hole.

3. The dual head infinitely variable brushless motor of claim 2, wherein, The shell (1) is composed of a mounting plate, a first cover and a second cover, the stepless speed change mechanism and the power output mechanism are respectively arranged in the first cover and the second cover.

4. The dual head infinitely variable brushless motor of claim 1, wherein, The outer surface of the third output shaft (9) is sleeved with a linear bearing (12), the linear bearing (12) is fixed on the fixed frame (11), and the third output shaft (9) is slidably connected with the linear bearing (12).

Images