A wiper drive

Abstract

The utility model relates to wiper technology field discloses a wiper drive arrangement, including output shaft and direct drive motor, the one end of output shaft is through the shaft coupling with direct drive motor drive connection, the other end is with wiper drive connection, direct drive motor includes motor permanent magnet, motor coil, brushless motor stator, speed reducer, outer rotor and drive circuit board, the utility model discloses discarding the crank rocker reversing mechanism of traditional mechanical electric wiper, and the positive and negative rotation of direct drive motor is used to realize the reciprocating motion of output shaft directly, avoids the problem that crank rocker mechanism is quick to return characteristic and reversing impact is big, realizes the accurate reciprocating acceleration and deceleration control of motor through the vector control technology of brushless motor, has compact structure, high efficiency, output torque is big, and the advantages such as long service life are that the brush angle and the brush speed can be adjusted at random through software.

Description

Technical Field

[0001] This utility model relates to the field of windshield wiper technology, and in particular to a windshield wiper drive device. Background Technology

[0002] With the rapid development of rail transit equipment, various types of rail transit vehicles are constantly being upgraded and iterated, gradually reaching higher levels. As an auxiliary device affecting the safety of rail transit vehicles, windshield wipers suffer from problems such as significant structural differences between different vehicle models, limited installation space, small quantity, low value, and severe customization. Not only are there diverse product models and structures, but the failure rate remains high. This has always been a headache for various OEMs in the design and development of rail transit vehicles. Major OEMs have attempted to standardize windshield wiper interfaces, but all attempts have failed due to differences in structural size and operating principles.

[0003] Currently, traditional electric windshield wipers all use a unidirectional, continuously rotating worm gear reducer motor to drive a crank-rocker mechanism to achieve the reversal of the main shaft. This approach has the following characteristics: ① It occupies a large space, requiring constant adjustments to the mechanical mechanism based on available space, resulting in very low versatility; ② The crank-rocker mechanism uses sliding friction for its motion connection, which is inefficient and prone to degradation over time, leading to increased noise; ③ Wipers with different angles require redesigning the four-bar linkage parameters, and the dynamic characteristics of some parameters contradict the spatial dimensions, often necessitating a balance between parameter characteristics and dimensions, resulting in inconsistent mechanical structures and increasing the workload of repetitive verification.

[0004] In summary, there is an urgent need for a windshield wiper drive device that is simple and compact in structure, highly efficient, and has a long service life. Utility Model Content

[0005] The purpose of this utility model is to provide a windshield wiper driving device, the specific technical solution of which is as follows:

[0006] A windshield wiper drive device includes an output shaft and a direct drive motor;

[0007] One end of the output shaft is connected to a direct drive motor via a coupling, and the other end is connected to the windshield wiper.

[0008] The direct drive motor includes a permanent magnet, a coil, a brushless stator, a reducer, an outer rotor, and a drive circuit board.

[0009] One end of the coupling is fixedly connected to the output end of the reducer; the reducer is integrated inside the stator of the brushless motor; the motor coil is fixed on the stator of the brushless motor; the outer rotor is located outside the stator of the brushless motor, and a permanent magnet of the motor is installed on it;

[0010] The drive circuit board is used to control the motion state of the direct drive motor.

[0011] Preferably, the end of the coupling has a groove, and the end of the output shaft has a protrusion. The protrusion and the groove are connected for transmission between the output shaft and the coupling.

[0012] Preferably, the reducer is a planetary gear reducer or a cycloidal pinwheel reducer.

[0013] Preferably, a radial permanent magnet is installed at the end of the outer rotor, and a magnetic encoder is installed on the drive circuit board near the radial permanent magnet, the magnetic encoder being able to sense changes in the magnetic field of the radial permanent magnet.

[0014] Preferably, the drive circuit board is mounted at the rear end of the direct drive motor and covered by the housing of the direct drive motor.

[0015] Preferably, the drive circuit board is connected to the CAN bus for communication, to receive angle and speed commands from the host computer, and to control the movement of the direct drive motor through sensor-based FOC technology.

[0016] Preferably, the output shaft is installed inside the through-wall bushing and is supported and limited by a deep groove ball bearing and a self-lubricating bearing on the through-wall bushing.

[0017] Preferably, the through-wall bushing is fixedly mounted on the fixed base;

[0018] The fixed base has a notch at a certain angle, and a limit seat is also installed on the output shaft to restrict the output shaft inside the notch of the fixed base, so that the wiping angle of the windshield wiper is limited to the design requirements.

[0019] The application of the technical solution of this utility model has the following beneficial effects:

[0020] A windshield wiper drive device includes an output shaft and a direct-drive motor. One end of the output shaft is connected to the direct-drive motor via a coupling, and the other end is connected to the windshield wiper. The direct-drive motor includes a permanent magnet, a coil, a brushless motor stator, a reducer, an outer rotor, and a drive circuit board. One end of the coupling is fixedly connected to the output end of the reducer. The reducer is integrated inside the brushless motor stator. The coil is fixed to the brushless motor stator. The outer rotor is located outside the brushless motor stator, and the permanent magnet is mounted on it. The drive circuit board controls the motion state of the direct-drive motor. This windshield wiper drive device eliminates the crank-rocker reversing mechanism of traditional mechanical-electric windshield wipers, instead using the forward and reverse rotation of the direct-drive motor to directly achieve the reciprocating motion of the output shaft, avoiding the rapid return characteristics and large reversing impact problems of the crank-rocker mechanism. The direct-drive motor integrates a high-load reducer, an outer rotor permanent magnet brushless motor, a magnetic encoder, and a drive circuit. Precise reciprocating acceleration and deceleration control of the motor can be achieved through vector control technology of the brushless motor. It boasts advantages such as compact structure, high efficiency, large output torque, adjustable brush angle and speed via software, long service life, maintenance-free operation, and the ability to achieve synchronous control of multiple motor stators. It solves the problems of low standardization, diverse structures, short lifespan, and inconvenient maintenance associated with existing windshield wipers for rail transit vehicles.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a windshield wiper drive device according to this utility model;

[0024] In the diagram: 1. Output shaft; 2. Through-wall bushing; 3. Deep groove ball bearing; 4. Fixed seat; 5. Limit seat; 6. Coupling; 7. Direct drive motor; 71. Motor permanent magnet; 72. Motor coil; 73. Brushless motor stator; 74. Reducer; 75. External rotor; 76. Drive circuit board; 77. Radial permanent magnet; 78. Magnetic encoder. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0026] refer to Figure 1 A windshield wiper drive device includes an output shaft 1 and a direct drive motor 7. One end of the output shaft 1 is connected to the direct drive motor 7 via a coupling 6, and the other end is connected to the windshield wiper. The direct drive motor 7 includes a permanent magnet 71, a coil 72, a brushless motor stator 73, a reducer 74, an outer rotor 75, and a drive circuit board 76. One end of the coupling 6 is fixedly connected to the output end of the reducer 74. The reducer 74 is integrated inside the brushless motor stator 73. The coil 72 is fixed on the brushless motor stator 73. The outer rotor 75 is disposed outside the brushless motor stator 73, and the permanent magnet 71 is mounted on it. The drive circuit board 76 is used to control the movement state of the direct drive motor 7.

[0027] The wiper drive device in this embodiment abandons the crank-rocker reversing mechanism of traditional mechanical and electric wipers, and instead uses the forward and reverse rotation of a direct drive motor to directly realize the reciprocating motion of the output shaft, thus avoiding the problems of rapid return characteristics and large reversing impact of the crank-rocker mechanism.

[0028] This direct-drive motor integrates a high-load reducer, an external rotor permanent magnet brushless motor, a magnetic encoder, and a drive circuit. It achieves precise reciprocating acceleration and deceleration control through vector control technology for brushless motors. It boasts advantages such as compact structure, high efficiency, large output torque, adjustable brush angle and speed via software, long service life, maintenance-free operation, and the ability to synchronously control multiple motor stators. It solves the problems of low standardization, diverse structures, short lifespan, and inconvenient maintenance in existing rail transit vehicle windshield wipers.

[0029] The structure of this external rotor brushless motor can improve the motor's output torque, low-speed stability, and efficiency.

[0030] The coupling 6 has a groove at one end, and the output shaft 1 has a protrusion at one end. The protrusion and groove are connected for transmission between the output shaft 1 and the coupling 6. This facilitates connection and disassembly, and is beneficial for the installation and maintenance of the direct drive motor.

[0031] The reducer 74 is either a planetary gear reducer or a cycloidal pinwheel reducer. The accompanying drawings of this embodiment show a planetary gear reducer.

[0032] A radial permanent magnet 77 is installed at the end of the outer rotor 75, and a magnetic encoder 78 is installed on the drive circuit board 76 near the radial permanent magnet 77. The magnetic encoder 78 can sense changes in the magnetic field of the radial permanent magnet 77.

[0033] The drive circuit board 76 is mounted at the rear end of the direct drive motor 7 and is covered by the housing of the direct drive motor 7, thereby reducing external interference.

[0034] The drive circuit board 76 communicates with the CAN bus to receive angle and speed commands from the host computer and controls the movement of the direct drive motor 7 using sensor-based FOC technology. Depending on the vehicle model, the CAN communication interface is used to control the drive spindle to move at the optimal angular velocity and angular acceleration.

[0035] To adapt to different scraping methods and load requirements, the speed curve and stop position of the drive device can be adjusted by setting the host computer program, without changing the main mechanical structure. It is very convenient to use and has a high degree of versatility.

[0036] The output shaft 1 is installed inside the through-wall bushing 2 and is supported and limited by the deep groove ball bearing 3 and the self-lubricating bearing on the through-wall bushing 2.

[0037] The through-wall bushing 2 is fixedly mounted on the fixed base 4;

[0038] The fixed seat 4 has a notch at a certain angle, and the output shaft 1 is also equipped with a limit seat 5, which is used to limit the output shaft 1 inside the notch of the fixed seat 4, so that the wiping angle of the windshield wiper can be limited to the range required by the design.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A windshield wiper drive device, characterized in that, Includes an output shaft (1) and a direct drive motor (7); One end of the output shaft (1) is connected to the direct drive motor (7) via a coupling (6), and the other end is connected to the windshield wiper. The direct drive motor (7) includes a permanent magnet (71), a coil (72), a brushless motor stator (73), a reducer (74), an outer rotor (75), and a drive circuit board (76). One end of the coupling (6) is fixedly connected to the output end of the reducer (74); the reducer (74) is integrated inside the brushless motor stator (73); the motor coil (72) is fixed on the brushless motor stator (73); the outer rotor (75) is located outside the brushless motor stator (73), and a motor permanent magnet (71) is installed on it. The drive circuit board (76) is used to control the motion state of the direct drive motor (7).

2. The wiper drive device according to claim 1, characterized in that, The coupling (6) has a groove at its end, and the output shaft (1) has a protrusion at its end. The protrusion and the groove are connected for transmission between the output shaft (1) and the coupling (6).

3. The wiper drive device according to claim 1, characterized in that, The reducer (74) is a planetary gear reducer or a cycloidal pinwheel reducer.

4. The wiper drive device according to claim 1, characterized in that, A radial permanent magnet (77) is installed at the end of the outer rotor (75), and a magnetic encoder (78) is installed on the drive circuit board (76) near the radial permanent magnet (77). The magnetic encoder (78) can sense the change in the magnetic field of the radial permanent magnet (77).

5. The wiper drive device according to claim 1, characterized in that, The drive circuit board (76) is mounted at the rear end of the direct drive motor (7) and is covered by the housing of the direct drive motor (7).

6. The wiper drive device according to any one of claims 1-5, characterized in that, The drive circuit board (76) is connected to the CAN bus to receive angle and speed commands from the host computer and control the movement of the direct drive motor (7) through sensor-based FOC technology.

7. The wiper drive device according to claim 1, characterized in that, The output shaft (1) is installed inside the through-wall bushing (2) and is supported and limited by the deep groove ball bearing (3) and the self-lubricating bearing on the through-wall bushing (2).

8. The wiper drive device according to claim 7, characterized in that, The through-wall bushing (2) is fixedly mounted on the fixed seat (4); The fixed seat (4) has a notch at a certain angle, and the output shaft (1) is also equipped with a limit seat (5) to limit the output shaft (1) inside the notch of the fixed seat (4) so ​​that the wiper angle is limited to the design requirements.

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