Electric brush assembling structure of starting motor

Abstract

An electric brush assembling structure of a starting motor comprises a starting motor rear cover, a brush carrier, electric brushes and brush boxes, the brush carrier is fixed on the starting motor rear cover, the two electric brushes are respectively assembled in the brush boxes symmetrically arranged on the brush carrier, the two electric brushes are in contact with a commutator of the starting motor, an opening groove with an upward opening is formed in the rear portion of each brush box, and the brush boxes are arranged in the opening grooves. A limiting piece is clamped in the opening groove, a compression spring is arranged between the limiting piece and the electric brush, and the electric brush makes contact with the commutator under the elastic force effect of the compression spring.

Description

Technical Field

[0001] The utility model relates to the technical field of starting motors, in particular to a brush assembly structure of a starting motor. Background Art

[0002] The starter motor is a crucial component in the engine starting system. Its primary function is to convert electrical energy into mechanical energy, driving the engine's flywheel and enabling the engine to enter self-operation from a standstill. The starter motor's brush assembly typically consists of a brush holder, brushes, and a spring structure. The brushes are located in the brush holder, and the spring structure allows the brushes to contact the commutator, transferring current through the brushes to the commutator.

[0003] CN210327233U discloses a brush base plate assembly for starting a motor, comprising a base plate, a brush holder, a brush and a coil spring. The brush is arranged in the brush holder, and the coil spring is arranged on a coil spring support frame fixedly connected to the base plate. The coil spring is connected to the brush to provide elastic force for the brush so that the brush can move horizontally in the brush holder.

[0004] The existing technology has the following deficiencies: the coil spring is arranged on a coil spring support frame, and the coil spring support frame is arranged on a base plate. The coil spring support frame and the brush holder exist relatively independently on the brush base plate. Therefore, the brush base plate assembly has many components and occupies a large space, which is not conducive to the production of small-sized starting motors; there are relatively many components, the production cost is high, and the production is complicated; the brush lead wire is led out from the side of the brush holder, occupying a large circumferential space of the base plate. Summary of the Invention

[0005] This utility model addresses the problems of the prior art by providing a brush assembly structure for a starter motor. Brush boxes are symmetrically arranged on a brush holder, housing brushes and a compression spring. The brush box has an upward-opening slot, within which a retaining plate abuts against the compression spring. The spring force of the compression spring presses the motor against the outer periphery of the commutator. This optimizes the brush assembly structure for the starter motor, reducing the number of components required. Compared to existing assembly structures in which the elastic structure and brushes are separately arranged, this brush assembly structure is smaller in size, making it more convenient for use with small starter motors.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] A brush assembly structure for a starter motor includes a rear cover of the starter motor, a brush holder, a brush, and a brush box. The brush holder is fixed to the rear cover of the starter motor, and two brushes are respectively assembled in brush boxes symmetrically arranged on the brush holder. The two brushes contact the commutator of the starter motor. An upwardly opening slot is provided at the rear of the brush box, and a limit plate is inserted into the opening slot. A compression spring is provided between the limit plate and the brush, and the brush contacts the commutator under the action of the elastic force of the compression spring.

[0008] Preferably, a wire outlet slot is provided at the upper end of the brush box, and the lead wires of the brushes are led out from the wire outlet slot at the upper end of the brush box.

[0009] Preferably, the rear side of the opening slot of the brush box is a stop part. After the limiting piece is inserted into the opening slot, the left and right ends extend out of the opening slot and bend, so that the left and right sides of the limiting piece are prevented from falling off and limited. The upper end of the stop part bends under the action of external force to reduce the opening of the opening slot, so that the limiting piece is prevented from falling off and limited upward.

[0010] Preferably, the thickness of the stop portion ranges from 0.5 mm to 1.0 mm.

[0011] Preferably, the vertical width of the limiting piece is no greater than three-fifths of the vertical depth of the opening groove.

[0012] Preferably, the brush holder and brush box are made of metal.

[0013] An upward opening slot is provided at the rear of a brush box fixed to the brush holder, a limiting plate is clamped in the opening slot, and a brush is provided at the front of the brush box. The brush and the limiting plate are respectively connected to the two ends of the compression spring. Under the action of the elastic force of the compression spring, the brush contacts the commutator, and the brush can elastically translate in the brush box.

[0014] Beneficial effects of the utility model:

[0015] Compared with the existing technology, this technical solution arranges the elastic structure and the brush in the brush box, which occupies less space; the lead wire of the brush is led out from the upper end of the brush box, reducing the occupation of the brush assembly structure on the circumferential space of the starter motor; it is better suitable for the production and manufacturing of small starter motors; compared with the independently arranged brush box, coil spring and its supporting structure in the existing technology, the number of components is reduced, the production cost is reduced, and the reliability and stability of the brush operation are increased; the brush holder and brush box made of metal have better heat resistance and structural stability than those made of plastic, which prevents the starter motor from running for a long time and the plastic brush holder and brush box from melting due to heat, thereby ensuring the stable operation of the starter motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the assembly of the utility model;

[0017] Figure 2 This is a schematic diagram of the installation of the brush box in the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the brush box in the utility model;

[0019] Figure 4 It is a schematic diagram of the external structure of the brush box in the utility model. DETAILED DESCRIPTION

[0020] See also Figures 1 to 4 A brush assembly structure for a starter motor includes a rear cover 4 of the starter motor, a brush holder 3, a brush 2, and a brush box 1. The brush holder 3 is fixed to the rear cover 4 of the starter motor. Two brushes 2 are respectively assembled in the brush boxes 1 symmetrically arranged on the brush holder 3. The brush box 1 is a rectangular frame structure. The upper end of the brush box 1 is provided with a U-shaped outlet groove. The brush box 1 is fixed to the inner end surface of the brush holder 3 by screws. The two brushes 2 are in contact with the commutator 8 of the starter motor. At the rear of the brush box 1, An opening groove 9 with an opening upward is provided at the top, and the rear side of the opening groove 9 of the brush box 1 is a retreat portion 10. The thickness range of the retreat portion 10 is 0.5mm to 1.0mm. In this embodiment, the thickness of the retreat portion is 1.0mm. The thickness of the retreat portion 10 cannot be too thick. A too thick retreat portion 10 cannot bend under the action of external force. The thickness of the retreat portion 10 cannot be too thin. A too thin retreat portion 10 is easy to break under the action of external force. A limiting piece 5 is stuck in the opening groove 9, and the limiting piece 5 is stuck in the opening groove 9. The vertical width of the positioning piece 5 is not greater than three-fifths of the vertical depth of the opening slot 9. If the vertical width of the limiting piece 5 is too wide, it will affect the bending of the stop portion 10. If the vertical width of the limiting piece 5 is too narrow, it will not be able to limit the compression spring 6. The limiting piece 5 is rectangular, and the left and right ends of the limiting piece 5 extend out of the opening slot 9 and bend, so that the left and right sides of the limiting piece 5 are prevented from falling off and limiting. The upper end of the stop portion 10 is bent under the action of external force to reduce the opening of the opening slot 9, so that the limiting piece 5 is prevented from falling off and limiting upward. A compression spring 6 is arranged between the limit plate 5 and the brush 2. Under the elastic force of the compression spring 6, the brush 2 can elastically translate in the brush box 1, and the brush 2 is in close contact with the commutator 8. The lead wire 7 of the brush 2 is led out from the wire outlet slot at the upper end of the brush box 1 and is connected to the conductive rod or power screw provided in the starter motor to energize the brush 2. The brush holder 3 and the brush box 1 are made of metal, which has better heat resistance and stability than plastic material, and is suitable for long-term stable operation of the starter motor.

[0021] The utility model arranges the brush 2, compression spring 6 and limit plate 5 in the brush box 1. Compared with the existing technology in which the elastic structure and the brush box are separately arranged on the brush holder, the structure is simpler, the stability is better, and it is suitable for small-volume starting motors.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A brush assembly structure for a starter motor, comprising a starter motor rear cover (4), a brush holder (3), a brush (2), and a brush box (1), wherein the brush holder (3) is fixed to the starter motor rear cover (4), two brushes (2) are respectively assembled in brush boxes (1) symmetrically arranged on the brush holder (3), and the two brushes (2) are in contact with a commutator (8) of the starter motor, characterized in that: An opening slot (9) with an opening facing upward is provided at the rear of the brush box (1), a limiting piece (5) is inserted into the opening slot (9), a compression spring (6) is provided between the limiting piece (5) and the brush (2), and the brush (2) contacts the commutator (8) under the elastic force of the compression spring (6).

2. The brush assembly structure of the starter motor according to claim 1, wherein: The upper end of the brush box (1) is provided with a wire outlet slot, and the lead wire (7) of the brush (2) is led out from the wire outlet slot at the upper end of the brush box (1).

3. The brush assembly structure of the starter motor according to claim 1, wherein: The rear side of the opening slot (9) of the brush box (1) is a stopper (10). After the limiting piece (5) is inserted into the opening slot (9), the left and right ends extend out of the opening slot (9) and bend, so that the limiting piece (5) is prevented from falling off and limiting on the left and right sides. The upper end of the stopper (10) bends under the action of an external force to reduce the opening of the opening slot (9), so that the limiting piece (5) is prevented from falling off and limiting upward.

4. The brush assembly structure for the starter motor according to claim 3, wherein: The thickness of the stop portion (10) ranges from 0.5 mm to 1.0 mm.

5. The brush assembly structure of the starter motor according to claim 3, wherein: The vertical width of the limiting piece (5) is no greater than three-fifths of the vertical depth of the opening groove (9).

6. The brush assembly structure for a starter motor according to claim 1, wherein: The brush holder (3) and the brush box (1) are made of metal.

Images