Automobile motor

Abstract

The utility model discloses an automobile motor, which comprises a shell, a magnetic ring, a rotor and an end cover, the rotor comprises an output shaft, an iron core, a commutator and an enameled wire, the magnetic ring is positioned in the shell, a carbon crystal, a conductive connecting piece and a terminal are arranged in the end cover, one end, extending out of the shell, of the output shaft is provided with a worm, and the output shaft is provided with knurls. According to the utility model, the knurls and the worm are directly arranged on the output shaft of the motor, the motor is high in bonding strength and large in torque, and the PTC fuse is arranged in the end cover, so that the motor and a circuit can be effectively protected from being damaged by overlarge current, and the service life of the motor is prolonged. And the PTC fuse can realize self-recovery.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and more specifically relates to an automotive motor. Background Art

[0002] An automotive micro-motor is a type of brushed DC micro-motor. With the development of automotive electrification and intelligence, the application scenarios of micro-motors have been continuously increasing, such as electric window adjustment, electric seat adjustment, door handles, door locks, etc., providing a more comfortable, convenient, and intelligent driving experience for vehicles.

[0003] When the micro-motor is applied to the door handle, it usually only requires a small force to retract and extend the door handle. However, under some special conditions, such as in the north, sometimes due to weather reasons, the gap between the door handle and the door may freeze. The ordinary micro-motor has insufficient power and motor stall, not only unable to open the door, but also causing damage to the micro-motor or circuit components due to large current. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a structure in which knurling is directly set on the output shaft of the motor and is provided with a worm. The bonding strength is high and the torque is large. At the same time, a PTC fuse is arranged inside the end cover, which can effectively protect the motor and the circuit from damage caused by excessive current, and the PTC fuse can achieve self-recovery.

[0005] To achieve the above object, the utility model provides the following technical solutions: an automotive motor, comprising a housing, a magnetic ring, a rotor, and an end cover. The rotor includes an output shaft, an iron core, a commutator, and enameled wire. The magnetic ring is located inside the housing. Inside the end cover, carbon crystals, conductive connectors, and terminals are provided. One end of the output shaft extending out of the housing is provided with a worm, and knurling is set on the output shaft. The worm is located at the knurled part of the output shaft. A PTC fuse is also arranged inside the end cover, and the PTC fuse is connected in series with the terminal.

[0006] Further, a brush holder is arranged inside the end cover. The brush holder includes a fixing piece, a mounting piece, and an elastic piece. The mounting piece is provided with a mounting groove, and the carbon crystal is fixed in the mounting groove. The fixing piece is fixed on the end cover. Both ends of the elastic piece are connected to the fixing piece and the mounting piece, and an obtuse angle connection is set between the elastic piece and the mounting piece.

[0007] Further, reinforcing pieces are arranged on the sides of both the elastic piece and the mounting piece, and the fixing piece, the mounting piece, the elastic piece, and the reinforcing piece are integrally bent and formed.

[0008] Further, heat dissipation channels are arranged on the iron core.

[0009] Further, the magnetic ring is a rare earth magnet.

[0010] Further, chamfers are arranged on both the housing and the magnetic ring.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing knurling on the output shaft and directly forming the worm on the knurled part, the combination is tight, the torque is large, and relative rotation will not occur, which can solve the force required to break when the car door handle is frozen; A PTC fuse is added to the circuit. When the micro-motor is overloaded or short-circuited, resulting in excessive current, the PTC fuse will quickly heat up. As the temperature rises, its resistance value increases sharply, which effectively limits the current.

[0012] Thus, it protects the micro-motor and other circuit components from damage caused by excessive current. Once the overload condition is removed, the PTC fuse will automatically cool down and return to the low-resistance state, allowing the current to flow again; The brush holder is made of copper with strong conductivity, and its structural form can ensure that it has good elasticity, so that the carbon crystal is closely attached to the commutator without an additional spring, making the internal space of the end cover small. Description of the Drawings

[0013] Figure 1 It is a three-dimensional structure diagram of the automotive motor of the present utility model;

[0014] Figure 2 It is an exploded view of the automotive motor of the present utility model;

[0015] Figure 3 It is a three-dimensional structure diagram of the rotor in the present utility model;

[0016] Figure 4 It is a three-dimensional structure diagram of the end cover in the present utility model;

[0017] Figure 5 It is a three-dimensional structure diagram of the brush holder;

[0018] Figure 6 It is a circuit diagram of the present utility model.

[0019] Reference Signs: 1. Housing; 11. Magnetic Ring; 2. End Cover; 21. PCB Board; 3. Output Shaft; 31. Knurling; 4. Worm; 5. Iron Core; 51. Enameled Wire; 52. Heat Dissipation Channel; 6. Commutator; 7. Carbon Crystal; 8. Brush Holder; 81. Mounting Piece; 812. Reinforcing Piece; 82. Elastic Piece; 83. Fixed Piece; 89. Conductive Piece; 9. PTC Fuse. Detailed Embodiments

[0020] Refer to Figures 1 to 6 To further describe the embodiments of the automotive motor of the present utility model.

[0021] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0022] In addition, such terms as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meanings of "several" and "a number of" are two or more, unless otherwise specifically defined.

[0023] An automotive motor includes a housing 1, a magnetic ring 11, a rotor, and an end cover 2. The rotor includes an output shaft 3, an iron core 5, a commutator 6, and an enameled wire 51. The magnetic ring 11 is located inside the housing 1. A carbon crystal 7, a conductive connection member, and a terminal are provided inside the end cover 2. A worm 4 is provided at one end of the output shaft 3 extending out of the housing 1. Knurling 31 is provided on the output shaft 3, and the worm 4 is located at the knurling 31 of the output shaft 3. A PTC fuse 9 is also provided inside the end cover 2, and the PTC fuse 9 is connected in series with the terminal.

[0024] As Figure 2 shown, the output shaft 3 in this embodiment is made of metal, and the worm 4 can be made of metal or plastic. When it is made of plastic, first, the output shaft 3 is knurled 31, and then the worm 4 is directly formed at the knurling 31 of the output shaft 3, so that the worm 4 completely fits the knurling 31 of the output shaft 3. When applied, the worm 4 is also connected to a worm wheel to directly amplify the torque. The worm 4 and the output shaft 3 are completely integrated and will not rotate relative to each other, improving stability and reliability, with large torque and strong ice-breaking ability.

[0025] The PTC fuse 9 is a self-resetting fuse PTC. As Figure 6 shown, it is connected in series in the circuit. When the micromotor is overloaded or short-circuited, resulting in excessive current, the PTC fuse will quickly heat up. As the temperature rises, its resistance value increases sharply, which effectively limits the current, thereby protecting the micromotor and other circuit components from damage caused by excessive current. Once the overload condition is removed, the PTC fuse 9 will automatically cool down and return to the low-resistance state, allowing the current to flow again, and the entire circuit returns to normal.

[0026] The entire circuit can quickly and automatically adjust and switch between overload and normal conditions, or in other words, it can be reused without replacing components, has a small volume, and provides relatively stable circuit protection.

[0027] In this embodiment, the terminal is fixed on the end cover 2 and is used to connect to the circuit or power supply outside the micro-motor.

[0028] As Figure 4 shown, the end cover 2 is made of plastic, which can make the motor lighter. There is also a bearing seat on the end cover 2, and a bearing is installed in the bearing seat, or there is no bearing seat, and the end cover 2 is directly formed on the bearing during molding, reducing structural components and installation steps.

[0029] As Figure 3 shown, in this embodiment, the magnetic ring 11 uses rare earth magnets to enhance the magnetic field performance; the magnetic ring 11 is multi-pole magnetized, has strong performance and large torque, and uses a multi-slot core 5. Multiple cores are arranged along the output shaft and form multiple winding grooves. Multiple winding grooves all extend along the axial direction of the output shaft. After multiple cores are arranged, they form an entire rotor core, and multiple linearly extending winding grooves are formed in the rotor core, which can improve the winding efficiency, have small torque ripple, stable performance, and the overall sound of the motor is small.

[0030] Chamfers are provided on both the outer shell and the magnetic ring. The cross-section of the outer shell 1 is square and has chamfers at the four corners. The magnetic ring 11 is arranged in contact with the outer shell 1.

[0031] As Figure 2 and 3 shown, the core 5 adopts a six-slot design and is coated with an insulating layer. Similarly, the output shaft also has a coating layer. By using the coating, the rotor core and the output shaft are regarded as a whole, which is more convenient during installation and reduces the relative positioning structure between the two. When in use, current is introduced from the commutator, causing the rotor core to form a magnetic field. Under the interaction of the magnetic ring, the output shaft rotates to output driving force outward. The enameled wire 51 is heat-resistant, and the winding design is efficient; Armature winding: The winding on the armature core 5 uses conductive wire materials and is arranged through precise winding technology to form a multi-layer staggered structure to enhance the magnetic field uniformity and reduce the heat accumulation in the current concentration area; Wear-resistant commutator 6 design: The commutator 6 sheet material selects a composite material containing a high proportion of copper and wear-resistant alloy components. On the basis of ensuring good electrical conductivity, this material significantly improves the anti-wear performance and extends the service life.

[0032] As Figure 4 and 5As shown, a brush holder 8 is provided inside the end cap 2. The brush holder 8 includes a fixing piece 83, a mounting piece 81, and an elastic piece 82. An installation groove is provided on the mounting piece 81, and the carbon crystal 7 is fixed in the installation groove. The fixing piece 83 is fixed on the end cap 2. Both ends of the elastic piece 82 are connected to the fixing piece 83 and the mounting piece 81, and an obtuse connection is provided between the elastic piece 82 and the mounting piece 81.

[0033] The brush holder 8 is preferably made of copper material with good electrical conductivity. The brush holder 8 is electrically connected to the terminal through a conductive connecting piece. The conductive connecting piece is preferably sheet-shaped and can also be called a conductive sheet 89. After setting the installation positions of the conductive connecting piece and the brush holder 8 on the end cap 2, they can be fixed by simply snapping them into place. The fixing is stable and the space occupied is small. By using the angular connection between the elastic piece 82 and the mounting piece 81, the carbon crystal 7 has a tendency to move towards the commutator 6, ensuring that the carbon crystal 7 fits the commutator 6 without the need for additional spring installation.

[0034] In this embodiment, preferably, reinforcing pieces 812 are provided on the sides of both the elastic piece 82 and the mounting piece 81, and the fixing piece 83, the mounting piece 81, the elastic piece 82, and the reinforcing piece 812 are integrally bent and formed.

[0035] The reinforcing piece 812 is connected to the elastic piece 82 and the mounting piece 81 to form a structure with a U-shaped cross-section, making it difficult for the elastic piece 82 and the mounting piece 81 to undergo permanent deformation, ensuring good electrical conductivity while having stable elastic performance.

[0036] In this embodiment, a PCB board 21 is also arranged inside the end cap 2. Fixing the PCB board 21 inside the end cap 2 can achieve better electrical connection and make the performance of the motor more stable.

[0037] In this embodiment, preferably, the iron core has heat dissipation channels 52, which effectively increase the heat exchange area, accelerate heat dissipation, and keep the operating temperature of the motor stable.

[0038] As Figure 1 shown, preferably, heat dissipation holes are provided on the outer shell 1, which lead to the space where the magnetic ring 11 and the rotor are located.

[0039] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. An automobile motor, comprising a housing, a magnetic ring, a rotor and an end cover, wherein the rotor comprises an output shaft, an iron core, a commutator and an enameled wire, the magnetic ring is located in the housing, and the end cover is provided with carbon crystals, conductive connectors and terminals, characterized in that: A worm is arranged at one end of the output shaft extending out of the housing, and knurling is arranged on the output shaft. The worm is located at the knurling of the output shaft. A PTC fuse is also arranged in the end cover, and the PTC fuse is connected in series with the terminal.

2. The automotive motor according to claim 1, characterized in that: A brush holder is arranged in the end cover, and the brush holder includes a fixing plate, a mounting plate and an elastic plate. A mounting groove is arranged on the mounting plate, and the carbon crystal is fixed in the mounting groove. The fixing plate is fixed on the end cover, and the two ends of the elastic plate are connected to the fixing plate and the mounting plate, and the elastic plate and the mounting plate are arranged to be connected at an obtuse angle.

3. The automotive motor according to claim 2, characterized in that: The sides of the elastic sheet and the mounting sheet are both provided with reinforcing sheets, and the fixing sheet, the mounting sheet, the elastic sheet and the reinforcing sheet are integrally bent and formed.

4. The automotive motor according to claim 3, characterized in that: The iron core is provided with a heat dissipation channel.

5. The automotive motor according to claim 4, characterized in that: The magnetic ring is a rare earth magnet.

6. The automotive motor according to claim 5, characterized in that: The shell and the magnetic ring are both provided with chamfers.

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