A commutator structure for a pedal motor

Abstract

The utility model discloses a commutator structure of pedal motor, including motor end cover, mainboard, power cord, brush plate shell and brush mechanism, mainboard sets up motor end cover one side, and power cord one end is connected on mainboard, and brush plate shell is fixed on mainboard, and brush mechanism sets up in brush plate shell, and brush mechanism includes slip seat, sliding block, brush, butt joint, gear and linkage rack. In the utility model, through the spring elasticity of spring, butt joint is removed, and then through gear drive linkage rack engages linkage, and then make the corresponding displacement of two sliding blocks up and down, and make two brushes can be self -adaptation and armature ring outer wall abut, through double -brush symmetrical layout cooperation gear synchronous drive, ensure that two brushes and ring contact surface pressure distribution is even, eliminate single -point concentrated wear phenomenon, and gear rack mechanism can real -time response ring radial runout, through force feedback automatic adjustment brush abutment interval.

Description

Technical Field

[0001] This utility model relates to a commutator, specifically a commutator structure for a pedal motor, and belongs to the field of commutator technology. Background Technology

[0002] A commutator, also known as a "rectifier," is an important component of the armature of DC motors and AC commutator motors. It consists of many copper plates separated by mica sheets, forming a cylindrical or disc shape. Each copper plate is connected to several armature winding elements. When the armature rotates, the copper plates successively contact the fixed brushes. In a DC motor, the AC current in the armature winding is converted into DC current between the brushes through the brushes and the commutator. In an AC commutator motor, the frequency of the AC current between the brushes is made to meet the operating requirements.

[0003] However, most existing commutators have various problems. For example, in the commutator disclosed in announcement number CN208656127U, although it avoids damage to the commutator surface during welding by setting arc-shaped baffles near the terminal hooks and setting protrusions at the contact points between the commutator segments and carbon brushes to locally increase the thickness of the commutator segments and extend their service life, in this technical solution and most current commutators, the brushes are mostly kept in contact with the rotating ring by spring pressure to achieve current conduction. However, due to radial runout or assembly tolerances during the rotation of the ring, uneven friction is easily generated on the contact surface between the brush and the ring, leading to increased local wear of the brushes. This wear difference will further cause an imbalance in the brush contact pressure distribution, forming a vicious cycle. Furthermore, the reduced contact pressure in the locally worn areas leads to arc discharge, accelerating material loss; while the unworn areas generate excessive frictional heat due to pressure concentration, ultimately causing the contact area between the brush and the ring to continuously decrease, resulting in problems such as increased contact resistance, abnormal temperature rise, and increased commutation sparks, which seriously affect the stability of motor operation and the service life of the brushes. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing technologies are too simplistic. Specifically, the purpose of this utility model is to solve the aforementioned shortcomings of existing technologies by proposing a commutator structure for a pedal motor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A commutator structure for a pedal motor includes a motor end cover, a main board, a power cord, a brush plate housing, and a brush mechanism. The main board is disposed on one side of the motor end cover, one end of the power cord is connected to the main board, the brush plate housing is fixed to the main board, and the brush mechanism is disposed inside the brush plate housing. The brush mechanism includes a sliding seat, a slider, a brush, a connector, a gear, and a linkage rack. The sliding seat is fixed inside the brush plate housing. The slider is slidably engaged in the sliding seat. The brush is fixed on the slider at one end outside the brush plate housing. The integrated structure consisting of the slider and the brush has two symmetrically arranged vertically inside the brush plate housing, and two adjacent brushes slide against the outer wall of the armature ring. The connector is slidably engaged in the center inside the brush plate housing. The gear is rotatably connected inside the connector. The linkage rack is fixed on the adjacent vertical sliders on their close sides and meshes with the gear.

[0006] As a further embodiment of this utility model: the brush mechanism further includes a limiting plate, a spring and a contact rod, the limiting plate is fixed to one end of the connector, the contact rod is disposed on the brush plate housing at the end away from the brush, and the spring is disposed between the limiting plate and the contact rod.

[0007] As a further embodiment of this utility model: a screw hole is provided through the end of the brush plate shell away from the brush, the outer wall of the abutment rod is provided with threads, the abutment rod is screwed into the screw hole by the threads, and a polygonal groove is provided on the end of the abutment rod away from the spring.

[0008] As a further improvement of this utility model: the limiting plate and the abutment rod are coaxially fixed with a protrusion at their respective ends, and the protrusion is engaged with both ends of the spring.

[0009] As a further improvement of this utility model: the sliding seat is provided with a dovetail-shaped groove, the slider has a dovetail-shaped cross-section, and the slider slides within the groove.

[0010] As a further improvement of this utility model, a corrugated tube is provided on the outside of the power cord.

[0011] The beneficial effects of this utility model are: In this invention, the spring force pushes the connector to move, which in turn drives the linkage rack through the gear, causing the upper and lower sliders to move accordingly. This allows the two brushes to adaptively abut against the outer wall of the armature ring. The symmetrical arrangement of the two brushes, combined with the synchronous drive of the gear, ensures uniform pressure distribution on the contact surface between the two brushes and the ring, eliminating single-point concentrated wear. Furthermore, the gear and rack mechanism can respond to the radial runout of the ring in real time and automatically adjust the brush abutment distance through force feedback to maintain constant contact pressure. This design is simple, efficient, and practical. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the brush plate housing structure of this utility model; Figure 3 This is a schematic diagram of the brush mechanism structure of this utility model; Figure 4 This is a schematic diagram of the spring and its connection structure according to the present invention.

[0013] In the diagram: 1. Motor end cover, 2. Main board, 3. Power cord, 4. Brush plate housing, 5. Brush mechanism, 51. Sliding seat, 52. Slider, 53. Brush, 54. Connecting joint, 55. Gear, 56. Linkage rack, 57. Limiting plate, 58. Spring, 59. Abutment rod, 6. Bellows. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0015] like Figures 1 to 4 As shown, a commutator structure for a pedal motor includes a motor end cover 1, a main board 2, a power cord 3, a brush plate housing 4, and a brush mechanism 5. The main board 2 is disposed on one side of the motor end cover 1, one end of the power cord 3 is connected to the main board 2, the brush plate housing 4 is fixed on the main board 2, and the brush mechanism 5 is disposed inside the brush plate housing 4. The brush mechanism 5 includes a sliding seat 51, a slider 52, a brush 53, a coupling 54, a gear 55, and a linkage rack 56. The sliding seat 51 is fixed inside the brush plate housing 4. The slider 52 is slidably engaged inside the sliding seat 51. The brush 53 is fixed on the slider 52 at one end located outside the brush plate housing 4. The overall structure formed by the combination of slider 52 and brush 53 has two symmetrically arranged vertically inside the brush plate housing 4. The two adjacent brushes 53 slide against the outer wall of the armature ring. The coupling 54 is slidably engaged at the center inside the brush plate housing 4. The gear 55 is rotatably connected inside the coupling 54. The linkage rack 56 is fixed on the side of the two adjacent sliders 52 that are close to each other and meshes with the gear 55. The brush mechanism 5 also includes a limiting plate 57, a spring 58 and an abutment rod 59. The limiting plate 57 is fixed to one end of the connector 54, the abutment rod 59 is disposed on the brush plate housing 4 at the end away from the brush 53, and the spring 58 is disposed between the limiting plate 57 and the abutment rod 59.

[0016] In this invention, the spring force of spring 58 pushes the connector 54 to move, which in turn drives the linkage rack 56 to mesh and move through gear 55. This causes the upper and lower sliders 52 to move accordingly, and the two brushes 53 can adaptively abut against the outer wall of the armature ring. The symmetrical layout of the two brushes 53, combined with the synchronous drive of the gear, ensures that the pressure distribution of the two brushes 53 on the contact surface with the ring is uniform, eliminating the phenomenon of concentrated wear at a single point. Moreover, the gear and rack mechanism can respond to the radial runout of the ring in real time and automatically adjust the abutment distance of the brushes 53 through force feedback to maintain a constant contact pressure. It is simple, efficient and practical. Example 2

[0017] like Figures 1 to 4 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes: A screw hole is provided through the end of the brush plate housing 4 away from the brush 53. The outer wall of the abutment rod 59 is provided with threads. The abutment rod 59 is screwed into the screw hole by the threads. A polygonal slot is provided at the end of the abutment rod 59 away from the spring 58. The screw hole allows the compression of the spring 58 by the abutment rod 59 to be adjusted to a certain extent.

[0018] The limiting plate 57 and the abutment rod 59 are coaxially fixed with protrusions at their close ends, and the protrusions are engaged with both ends of the spring 58. The protrusions limit the spring 58 and prevent it from falling off.

[0019] The sliding seat 51 is provided with a dovetail-shaped groove, the slider 52 has a dovetail-shaped cross-section, and the slider 52 slides in the groove. The dovetail groove limits the slider 52 and prevents it from separating from the sliding seat 51 during sliding.

[0020] The power cord 3 is covered with a corrugated tube 6 to protect the outside of the power cord 3.

[0021] When using this commutator, first rotate the abutment rod 59 so that it is threaded in the screw hole of the brush plate housing 4, and compress the spring 58 to a certain amount. At this time, the spring 58 pushes the coupling joint 54 and the gear 55 to move. The gear 55 drives the linkage rack 56 to mesh and move, and drives the slider 52 to move accordingly, so that the brush 53 can adaptively abut against the armature ring. During operation, the power supply line 3 and the brush 53 conduct electricity and transmit the current to the armature ring.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A commutator structure of a pedal motor, comprising a motor end cover (1), a main plate (2), a power line (3), a brush plate shell (4) and a brush mechanism (5), characterized in that, The main board (2) is located on one side of the motor end cover (1), one end of the power cord (3) is connected to the main board (2), the brush plate shell (4) is fixed on the main board (2), and the brush mechanism (5) is located inside the brush plate shell (4). The brush mechanism (5) includes a sliding seat (51), a slider (52), a brush (53), a connector (54), a gear (55), and a linkage rack (56). The sliding seat (51) is fixed inside the brush plate housing (4). The slider (52) is slidably engaged inside the sliding seat (51). The brush (53) is fixed on the slider (52) at one end outside the brush plate housing (4). The slider (52) and the brush (53) are combined to form an integral structure with two symmetrically arranged inside the brush plate housing (4). Two adjacent brushes (53) slide against the outer wall of the armature ring. The connector (54) is slidably engaged at the center inside the brush plate housing (4). The gear (55) is rotatably connected inside the connector (54). The linkage rack (56) is fixed on the side of two adjacent sliders (52) that are close to each other and meshes with the gear (55).

2. The commutator structure of a pedal motor according to claim 1, characterized in that: The brush mechanism (5) further includes a limiting plate (57), a spring (58) and an abutment rod (59). The limiting plate (57) is fixed to one end of the connector (54), the abutment rod (59) is disposed on the brush plate housing (4) at one end away from the brush (53), and the spring (58) is disposed between the limiting plate (57) and the abutment rod (59).

3. The commutator structure of a pedal motor according to claim 2, characterized in that: A screw hole is provided through the end of the brush plate housing (4) away from the brush (53). The outer wall of the abutment rod (59) is provided with threads. The abutment rod (59) is screwed into the screw hole by the threads. A polygonal groove is provided on the end of the abutment rod (59) away from the spring (58).

4. The commutator structure of a pedal motor according to claim 2, characterized in that: The limiting plate (57) and the abutment rod (59) are coaxially fixed with a protrusion at one end, and the protrusion is engaged with both ends of the spring (58).

5. The commutator structure of a pedal motor according to claim 1, characterized in that: The sliding seat (51) is provided with a dovetail-shaped groove, the slider (52) has a dovetail-shaped cross-section, and the slider (52) slides within the groove.

6. The commutator structure of a pedal motor according to claim 1, characterized in that: The power cord (3) is fitted with a corrugated tube (6).

Images