Carbon brush seat and small motor

Abstract

The utility model relates to a carbon brush seat and a small motor employing the same, the carbon brush seat comprises a carrier plate, a carbon brush, a carbon brush box and an elastic member, the carbon brush box is fixed on the carrier plate, the carbon brush is slidably installed in the carbon brush box, two opposite sides of a carbon brush outlet end of the carbon brush box are respectively provided with a limiting groove, the elastic member comprises two volute spiral springs, and the two volute spiral springs are arranged on the carrier plate. The two volute spiral springs are arranged on the two limiting grooves in a one-to-one correspondence mode, the outer ring winding heads of the two volute spiral springs are connected through a connecting belt, and the connecting position of the connecting belt is wound and attached to the end face, away from the carbon brush outlet end of the carbon brush box, of the carbon brush in a U shape. According to the carbon brush seat, the arrangement form of the elastic piece does not occupy the space of the carbon brush in the sliding direction, and the carbon brush can be longer, so that the service life of the carbon brush is prolonged.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a carbon brush holder and a small motor capable of arranging longer carbon brushes. Background Art

[0002] In a brushed motor, carbon brushes contact the rotating components of the commutator to conduct current. They slide radially along the commutator's axis and are mounted on a brush holder. As the motor uses them, they wear out. To ensure they maintain effective contact with the commutator, a spring is typically used to hold them in place. Springs typically include coil springs and torsion springs.

[0003] A coil spring is mounted on the end of the carbon brush away from the commutator and presses against the motor housing. A torsion spring is mounted on a fixed post on one side of the carbon brush. One arm of the torsion spring is clamped to the carbon brush holder, while the other arm presses against the end of the carbon brush away from the commutator. To ensure pressure against the center of the ends, the end of the torsion spring is formed into a U-shaped hook. Therefore, both the coil spring and the torsion spring occupy a certain amount of space in the sliding direction of the carbon brush, which limits the length of the carbon brush. This is especially true in small motors with smaller diameters. The short carbon brush length and service life are shortened, significantly impacting the motor's lifespan. Utility Model Content

[0004] Based on this, the present application provides a carbon brush holder and a small motor, which can set the carbon brush length longer.

[0005] To achieve the above purpose, the technical solutions adopted in this application are as follows:

[0006] A carbon brush holder comprises a carrier plate, a carbon brush, a carbon brush box and an elastic member, wherein the carbon brush box is fixed to the carrier plate, the carbon brush is slidably installed in the carbon brush box, a limiting groove is provided on opposite sides of the carbon brush outlet end of the carbon brush box, the elastic member comprises two volute springs, the two volute springs are arranged in a one-to-one correspondence on the two limiting grooves, the outer coil heads of the two volute springs are connected by a joint, and the joint is wrapped in a U-shape around the end face of the carbon brush away from the carbon brush outlet end of the carbon brush box.

[0007] Furthermore, the carbon brush box is a flanged box body, which includes an integrally formed open slot shell and two mounting plates. The two mounting plates are bent at right angles on the two opening edges of the open slot shell, and the opening of the open slot shell faces the carrier plate. The mounting plate is fixedly mounted on the carrier plate. The open slot shell and the carrier plate form a carbon brush cavity for slidingly mounting the carbon brush.

[0008] Furthermore, the limiting groove is a C-shaped groove, and the C-shaped groove is composed of a C-shaped baffle, and the C-shaped baffle is arranged on the side of the open groove shell.

[0009] Furthermore, the carbon brush is connected to a conductive wire, and the open slot shell is provided with a strip-shaped clearance hole for the conductive wire to pass through, and the strip-shaped clearance hole extends along the length direction of the open slot shell.

[0010] Furthermore, the mounting plate is fixed to the carrier plate through hollow rivets, and the conductive wire passes through the hollow rivets.

[0011] A small motor comprises the carbon brush holder as described in any one of the above items.

[0012] The carbon brush holder and small motor of the present application have an elastic member configured as two scroll springs, which are placed on opposite sides of the carbon brush outlet end of the brush box. The outer coil ends of the two scroll springs are connected by a band, and the connecting band is wrapped in a U-shape around the end face of the carbon brush away from the carbon brush outlet end of the brush box, thereby pressing the carbon brush tightly against the commutator. This elastic member arrangement has a small coil thickness and basically does not occupy space in the sliding direction of the carbon brush. Therefore, the carbon brush can be made longer, thereby extending the life of the carbon brush. In addition, the scroll spring itself is relatively small and does not occupy too much space on both sides of the carbon brush. Therefore, the carbon brush holder is very suitable for small motors with smaller diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is a structural diagram of the carbon brush holder according to an embodiment of the present application.

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of the elastic part in the carbon brush holder shown.

[0016] Figure 3 for Figure 1 Schematic diagram of the structure of the carbon brush box in the carbon brush holder shown.

[0017] Description of reference numerals:

[0018] 10. Carrier plate; 20. Carbon brush; 21. Conductive wire; 30. Carbon brush box; 31. Open slot shell; 311. Strip-shaped clearance hole; 32, 33. Mounting plate; 34, 35. C-shaped baffle; 40. Elastic part; 41, 42. Volute spring; 43. Joint of connecting strip; 51, 52. Limiting groove; 60. Hollow rivet. DETAILED DESCRIPTION

[0019] To make the above-mentioned purposes, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0022] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0023] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] refer to Figure 1 and Figure 2 The present application provides a carbon brush holder, comprising a carrier plate 10, a carbon brush 20, a carbon brush box 30 and an elastic member 40. The carbon brush box 30 is fixed on the carrier plate 10, and the carbon brush 20 is slidably installed in the carbon brush box 30. A limiting groove is respectively provided on opposite sides of the carbon brush outlet end of the carbon brush box 30. The elastic member 40 comprises two vortex springs (41, 42). The two vortex springs (41, 42) are arranged on the two limiting grooves (51, 52) in a one-to-one correspondence. The outer rings of the two vortex springs (41, 42) are connected by a joint, and the joint 43 is wrapped in a U shape around the end face of the carbon brush 20 away from the carbon brush outlet end of the carbon brush box 30.

[0025] In the carbon brush holder of the present application, the elastic member 40 is configured as two vortex springs (41, 42), which are respectively placed on opposite sides of the carbon brush outlet end of the carbon brush box 30. The outer coil ends of the two vortex springs (41, 42) are connected by a band, and the band connection 43 is wound in a U-shape and attached to the end face of the carbon brush 20 away from the carbon brush outlet end of the carbon brush box 30, thereby pressing the carbon brush 20 against the commutator. In this configuration of the elastic member 40, the band thickness is small and basically does not occupy space in the sliding direction of the carbon brush 20. Therefore, the carbon brush 20 can be made longer, thereby extending the service life of the carbon brush 20. In addition, the vortex springs (41, 42) themselves are also small and do not occupy too much space on both sides of the carbon brush 20. Therefore, the carbon brush holder of the present application is very suitable for small motors with smaller diameters.

[0026] refer to Figure 1 and Figure 3 Specifically, the carbon brush box 30 is a flanged box body, which includes an integrally formed open slot shell 31 and two mounting plates (32, 33). The two mounting plates (32, 33) are bent at right angles on the two opening edges of the open slot shell 31, one by one. The opening of the open slot shell 31 faces the carrier plate 10, and the mounting plates (32, 33) are fixedly mounted on the carrier plate 10. The open slot shell 31 and the carrier plate 10 form a carbon brush cavity for slidingly mounting the carbon brush 20.

[0027] Conventional carbon brush chambers are typically recessed into the motor end cap, making it difficult to manufacture. Alternatively, the brush box 30 is provided with claws to secure it to the carrier plate 10, which can easily deform the brush box 30 during machining. The present invention utilizes a flanged housing for ease of manufacture and resistance to deformation.

[0028] refer to Figure 1 and Figure 3Specifically, a C-shaped baffle (34, 35) is respectively provided on the two opposite sides of the carbon brush outlet end of the open slot shell 31. The C-shaped groove formed by the C-shaped baffle is a limit groove. The opening of the C-shaped groove is connected to the carbon brush cavity. The C-shaped baffle (34, 35) can limit the scroll spring (41, 42) from moving toward the end of the open slot shell 31 away from the carbon brush outlet end, so that the connecting part 43 keeps pressing the end of the carbon brush 20, so that the front end of the carbon brush 20 can be effectively pressed against the commutator.

[0029] Still a reference Figure 1 and Figure 3 Specifically, the carbon brush 20 is connected to the conductive wire 21. The open slot housing 31 is provided with a strip-shaped clearance hole 311 for the conductive wire 21 to pass through. The strip-shaped clearance hole 311 extends along the length of the open slot housing 31. In this way, when the carbon brush 20 wears and causes the conductive wire 21 to move, the conductive wire 21 passes through the strip-shaped clearance hole 311 without being pulled.

[0030] refer to Figure 1 Specifically, both mounting plates (32, 33) are fixed to the carrier plate 10 via hollow rivets 60, and the conductive wire 21 passes through the hollow rivets 60. Through holes for installing the hollow rivets 60 are correspondingly provided on the mounting plates (32, 33) and the carrier plate 10. The hollow rivets 60 can be used to fix the carbon brush box 30 and allow the conductive wire 21 to pass through.

[0031] The present application also provides a small motor, including the carbon brush holder as described above. Under the same smaller motor diameter, the length of the carbon brush 20 can be set longer, thereby extending the life of the carbon brush 20.

[0032] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-described embodiments merely represent several implementation methods of the present application and should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A carbon brush holder, characterized in that: The carbon brush box includes a carrier plate, a carbon brush, a carbon brush box and an elastic member. The carbon brush box is fixed to the carrier plate, and the carbon brush is slidably installed in the carbon brush box. A limiting groove is provided on opposite sides of the carbon brush outlet end of the carbon brush box. The elastic member includes two spiral springs. The two spiral springs are arranged in a one-to-one correspondence on the two limiting grooves. The outer coil heads of the two spiral springs are connected by a joint, and the joint is wrapped in a U-shape at the end face of the carbon brush away from the carbon brush outlet end of the carbon brush box.

2. The carbon brush holder according to claim 1, characterized in that: The carbon brush box is a flanged box body, which includes an integrally formed open slot shell and two mounting plates. The two mounting plates are bent at right angles on the two opening edges of the open slot shell, and the opening of the open slot shell faces the carrier plate. The mounting plates are fixedly mounted on the carrier plate. The open slot shell and the carrier plate form a carbon brush cavity for slidingly mounting the carbon brush.

3. The carbon brush holder according to claim 2, characterized in that: The limiting groove is a C-shaped groove, and the C-shaped groove is composed of a C-shaped baffle, and the C-shaped baffle is arranged on the side of the open groove shell.

4. The carbon brush holder according to claim 3, characterized in that: The carbon brush is connected to a conductive wire, and the open slot shell is provided with a strip-shaped clearance hole for the conductive wire to pass through, and the strip-shaped clearance hole extends along the length direction of the open slot shell.

5. The carbon brush holder according to claim 4, characterized in that: The mounting plate is fixed to the carrier plate through hollow rivets, and the conductive wire passes through the hollow rivets.

6. A small motor, characterized in that: The carbon brush holder comprises the carbon brush holder according to any one of claims 1 to 5.

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