Wear-resistant commutator

Abstract

The utility model provides a wear-resistant commutator, and belongs to the technical field of motors. The wear-resistant commutator comprises a base, commutator segments are slidably connected to the base in the radial direction, a supporting piece is slidably connected to the interior of the base in the axial direction, the back faces of all the commutator segments are slidably connected with the inclined face of the supporting piece, the outer end of the supporting piece is provided with an axial elastic piece, the commutator segments abut against an external electric brush, and the outer end of the supporting piece is provided with an elastic piece. The brush is fixed in position. The commutator has the advantages that the elastic piece is used for pushing the supporting piece to move axially, the inclined face is used for pushing all the commutator segments to expand radially, and therefore the commutator segments are tightly attached to the surface of an electric brush, the effect that abrasion of the commutator segments does not affect the friction diameter is achieved, the thickness of the commutator segments can be increased, and abrasion resistance is improved.

Description

Technical Field

[0001] This application relates to the technical field of motors, and more particularly, to a wear-resistant commutator. Background Art

[0002] A commutator is an important component of the armature of a brushed DC motor and an AC commutator motor. During the use of the commutator, the surface of the brush and the commutator rubs violently and continuously. The loss speed of the commutator segments on the commutator is fast, resulting in a low service life of the commutator. If the commutator segments are simply thickened, due to the wear of the commutator segments, the friction diameter between the commutator and the brush becomes smaller, resulting in the problem that the brush contacts more commutator segments at the same time and the motor efficiency decreases. Summary of the Utility Model

[0003] To make up for the above deficiencies, this application provides a wear-resistant commutator, aiming to improve the problems mentioned in the above background art.

[0004] An embodiment of this application provides a wear-resistant commutator, including a base. A commutator segment is radially slidably connected to the base. A support member is axially slidably connected inside the base. The back surfaces of all the commutator segments are slidably connected to the inclined surface of the support member. An axial elastic member is provided at the outer end of the support member. The commutator segment abuts against an external brush, and the position of the brush is fixed.

[0005] In a specific implementation, a slider is fixedly connected to the back surface of the commutator segment. The slider is dovetail slidably connected to the base, and the slider is slidably connected to the support member.

[0006] In the above implementation process, the commutator segment itself is made of copper alloy and is fixed to the slider through a T-shaped structure. The slider itself is connected to the base through a dovetail connection, which is beneficial to stabilizing the posture. The slider is also used to replace the commutator segment to rub against the support member, reducing the frictional resistance.

[0007] In a specific implementation, the support member includes a abutting block. The abutting block is dovetail slidably connected to the slider, and the friction surface between the abutting block and the slider is an inclined surface.

[0008] In the above implementation process, the commutator segment slides and rubs against the abutting block through the slider. When the abutting block moves axially, it can push the slider to move radially.

[0009] In a specific implementation, convex strips are provided on both sides of the abutting block, and sliding grooves adapted to the convex strips are provided on the base.

[0010] In the above implementation process, the convex strips slide in the sliding grooves, which is used to stabilize the moving posture of the abutting block and limit the abutting block on the base, thereby restricting the commutator segment through the slider.

[0011] In a specific embodiment, the support further includes a connecting plate, and all the abutting blocks are fixedly connected to the connecting plate.

[0012] In the above implementation process, the connecting plate is used to connect and fix all the abutting blocks together, so as to synchronously drive all the commutator segments to act.

[0013] In a specific embodiment, a rotating shaft is disposed through the base.

[0014] In the above implementation process, both the commutator and the rotating shaft are part of the rotor.

[0015] In a specific embodiment, the elastic member includes a disc base, the disc base is fixedly connected to the rotating shaft, and a spring is disposed between the disc base and the connecting plate.

[0016] In the above implementation process, the disc base continuously pushes the connecting plate and all the abutting blocks through the spring, so as to keep the commutator segment always having a moment of outward expansion and fitting with the brush. In this embodiment, the position of the brush is fixed, and the commutator segment is used to abut against the brush, rather than the conventional brush abutting against the commutator segment. In this way, when the commutator segment wears, the spring will stretch to promote the outward expansion of the commutator segment, so as to keep the fit with the brush.

[0017] In a specific embodiment, double welding grooves are formed on the commutator segment.

[0018] In the above implementation process, when the commutator segment moves radially, the solder joint will move synchronously with it. To avoid the loosening of the solder joint, double welding grooves are provided here to increase the strength of the solder joint. It should be noted that the wires between the solder joint and the winding need to retain appropriate length and tension, so that the wires can adapt to the movement of the solder joint by using their own ductility.

[0019] Compared with the prior art, the beneficial effect of the present application is that the elastic member is used to push the support to move axially, and the inclined plane is used to push all the commutator segments to expand radially, so as to closely adhere to the surface of the brush, achieving the effect that the wear of the commutator segment will not affect the friction diameter. Therefore, the thickness of the commutator segment can be increased to improve the wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic diagram of a wear-resistant commutator provided by an embodiment of the present application;

[0022] Figure 2 Schematic cross-sectional structure diagram of the base provided by the embodiment of the present application;

[0023] Figure 3 Schematic diagram of the connection relationship between the abutting block and the slider provided by the embodiment of the present application;

[0024] Figure 4 Schematic diagram of the connection relationship between the elastic member and the connecting plate provided by the embodiment of the present application.

[0025] In the figure: 10 - base; 20 - commutator segment; 30 - support member; 31 - abutting block; 32 - rib; 33 - connecting plate; 40 - elastic member; 41 - disk seat; 42 - spring; 50 - slider; 60 - rotating shaft. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0027] Please refer to Figures 1-4 , the present application provides a wear-resistant commutator, including a base 10, a commutator segment 20 is radially slidably connected to the base 10, a support member 30 is axially slidably connected in the base 10, the back surfaces of all the commutator segments 20 are slidably connected to the inclined surface of the support member 30, an axial elastic member 40 is provided at the outer end of the support member 30, the commutator segment 20 abuts against an external brush, and the position of the brush is fixed. Among them, the elastic member 40 is used to push the support member 30 to move axially, and the inclined surface is used to push all the commutator segments 20 to expand radially, so as to tightly adhere to the surface of the brush, achieving the effect that the wear of the commutator segment 20 does not affect the friction diameter. Therefore, the thickness of the commutator segment 20 can be increased to improve wear resistance.

[0028] Please refer to Figures 1-4 , a slider 50 is fixedly connected to the back surface of the commutator segment 20, the slider 50 is in a dovetail sliding connection with the base 10, and the slider 50 is slidably connected to the support member 30. The commutator segment 20 itself is made of copper alloy and is fixed to the slider 50 through a T-shaped structure. The slider 50 itself is connected to the base 10 through a dovetail, which is beneficial to stabilizing the posture. The slider 50 is also used to replace the commutator segment 20 to rub against the support member 30, reducing the frictional resistance.

[0029] Please refer to Figures 1-4 , the support member 30 includes an abutting block 31, the abutting block 31 is in a dovetail sliding connection with the slider 50, and the friction surface between the abutting block 31 and the slider 50 is an inclined surface. The commutator segment 20 rubs and slides against the abutting block 31 through the slider 50. When the abutting block 31 moves axially, it can push the slider 50 to move radially.

[0030] Please refer to Figures 1-4, convex strips 32 are provided on both sides of the abutting block 31, and sliding grooves adapted to the convex strips 32 are formed on the base 10. The convex strips 32 slide in the sliding grooves, which is used to stabilize the moving posture of the abutting block 31 and limit the abutting block 31 on the base 10, so as to limit the commutator segment 20 through the slider 50.

[0031] Please refer to Figures 1-4 , the support member 30 further includes a connecting plate 33, and all the abutting blocks 31 are fixedly connected to the connecting plate 33. The connecting plate 33 is used to connect and fix all the abutting blocks 31 together, so as to synchronously drive all the commutator segments 20 to act.

[0032] Please refer to Figures 1-4 , a rotating shaft 60 is disposed through the base 10. Both the commutator and the rotating shaft 60 are parts of the rotor.

[0033] Please refer to Figures 1-4 , the elastic member 40 includes a disc base 41, the disc base 41 is fixedly connected to the rotating shaft 60, and a spring 42 is disposed between the disc base 41 and the connecting plate 33. The disc base 41 continuously pushes the connecting plate 33 and all the abutting blocks 31 through the spring 42, so as to keep the commutator segment 20 always having a moment of outward expansion and fitting with the brush. In this embodiment, the position of the brush is fixed, and the commutator segment 20 is used to abut against the brush, rather than the conventional brush abutting against the commutator segment 20. In this way, when the commutator segment 20 wears, the spring 42 will stretch to promote the outward expansion of the commutator segment 20, so as to keep the fit with the brush.

[0034] Please refer to Figures 1-4 , double welding grooves are formed on the commutator segment 20. When the commutator segment 20 moves radially, the solder joints will move synchronously. To avoid the loosening of the solder joints, double welding grooves are provided here to increase the strength of the solder joints. It should be noted that the wires between the solder joints and the windings need to retain appropriate length and tension, so that the wires can adapt to the movement of the solder joints by using their own ductility.

[0035] The working principle of this wear-resistant commutator is as follows: the position of the brush is fixed and is axially pushed by the abutting block 31 of the spring 42, so as to radially push the slider 50 by using the friction of the inclined plane, and then push all the commutator segments 20 to abut tightly against the surface of the brush. When the commutator segment 20 wears, the commutator segment 20 can continuously abut against the surface of the brush under the push of the spring 42, so as to ensure that the friction diameter remains unchanged. In summary, the elastic member 40 is used to push the support member 30 to move axially, and the inclined plane is used to push all the commutator segments 20 to expand radially, so as to closely adhere to the surface of the brush, achieving the effect that the wear of the commutator segment 20 will not affect the friction diameter. Therefore, the thickness of the commutator segment 20 can be increased to improve the wear resistance.

[0036] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, improvement or equivalent replacement made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A wear-resistant commutator, characterized in that, It includes a base (10), on which a commutator segment (20) is slidably connected radially. A support member (30) is slidably connected axially within the base (10). The back surfaces of all the commutator segments (20) are slidably connected to the inclined surface of the support member (30). An axial elastic member (40) is provided at the outer end of the support member (30). The commutator segment (20) abuts against an external brush, and the position of the brush is fixed.

2. The wear-resistant commutator according to claim 1, wherein A slider (50) is fixedly connected to the back surface of the commutator segment (20). The slider (50) is slidably connected to the base (10) in a dovetail manner and is slidably connected to the support member (30).

3. The wear-resistant commutator according to claim 2, wherein, The support member (30) includes a abutting block (31). The abutting block (31) is slidably connected to the slider (50) in a dovetail manner, and the friction surface between the abutting block (31) and the slider (50) is an inclined surface.

4. A wear-resistant commutator according to claim 3, characterized in that, Ribs (32) are provided on both sides of the abutting block (31), and a chute adapted to the ribs (32) is formed on the base (10).

5. The wear-resistant commutator according to claim 4, characterized in that, The support member (30) further includes a connecting plate (33). All the abutting blocks (31) are fixedly connected to the connecting plate (33).

6. The wear-resistant commutator according to claim 5, characterized in that, A rotating shaft (60) is disposed through the base (10).

7. An abrasion-resistant commutator according to claim 6, characterized in that, The elastic member (40) includes a disc base (41). The disc base (41) is fixedly connected to the rotating shaft (60), and a spring (42) is provided between the disc base (41) and the connecting plate (33).

8. A wear-resistant commutator according to claim 7, characterized in that, Double welding grooves are formed on the commutator segment (20).

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