Powder discharging structure of starting motor

Abstract

A powder discharging structure of a starting motor comprises a rear cover of the starting motor, a commutator, a brush box and a brush carrier, the brush carrier is fixed on the inner end face of the rear cover, the commutator is located in a via hole formed in the brush carrier, a shaft of the commutator is supported in a shaft hole of the rear cover, the brush box is fixed on the brush carrier and located on the periphery of the commutator, a powder discharging groove is formed in the inner end face of the rear cover, and the brush carrier covers the powder discharging groove. A gap is reserved between the brush carrier and the commutator and communicated with the powder discharging groove, a powder discharging hole is formed in the rear cover and communicated with the powder discharging groove, a flow guide cover is arranged on the outer end face of the rear cover, a guide groove is formed in the flow guide cover and communicated with the powder discharging hole, and the guide groove extends in the radial direction of the rear cover.

Description

Technical Field

[0001] The utility model belongs to the technical field of starting motors, and specifically designs a powder discharge structure of a starting motor. Background Art

[0002] The starter motor is an important component in the engine starting system. Its main function is to convert electrical energy into mechanical energy, drive the engine flywheel to rotate, and help the engine enter the self-running state from a stationary state.

[0003] The starter motor consists of brushes and a commutator. Current is transmitted to the commutator through the brushes, which are typically fixed to a brush box. The commutator is typically interference-fitted onto the rotor shaft. When the motor is operating, the commutator rotates along with the rotor shaft and rotates relative to the brushes. Because the brushes are primarily composed of carbon powder, copper powder, and other additives, long-term wear and tear on the brushes and commutator can easily produce powder. Failure to promptly remove this powder can cause abnormal starter noise, commutator short circuits, and commutator segment burnout, leading to poor contact and even failure of the starter motor. In existing technologies, starter motors lack a powder removal mechanism, or if a powder removal mechanism is present, it fails to prevent external impurities from entering the starter motor, resulting in poor contact and even failure.

[0004] CN204928432U discloses a starter motor brush assembly and a starter motor. This utility model provides multiple powder discharge holes at the bottom of the brush box. These holes discharge powder generated by the friction between the brush and the commutator. However, this powder discharge method has the following disadvantages: the holes cannot guide the powder flow when discharging the powder, and the powder is naturally discharged disorderly, affecting the normal operation of other components; opening a hole at the bottom of each brush box is costly and complex. Especially for small-sized starter motors, the small holes have limited powder discharge capacity and are prone to clogging by powder. Summary of the Invention

[0005] To address the problems of the prior art, the present invention provides a powder discharge structure for a starter motor. This structure comprises a powder discharge trough provided on the rear cover of the starter motor, which is covered by a brush holder. A gap is provided between the brush holder and the commutator. Powder generated by the brushes passes through the gap between the brush holder and the commutator, falls into the powder discharge trough, and then flows through powder discharge holes provided on the rear cover and guide grooves in the air guide cover to be discharged from the starter motor. This discharges powder and improves powder discharge capacity.

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

[0007] A powder discharge structure for a starter motor includes a rear cover, a commutator, a brush box, and a brush holder of the starter motor. The brush holder is fixed to the inner end face of the rear cover, the commutator is located in a through hole provided on the brush holder, the shaft of the commutator is supported in the shaft hole of the rear cover, the brush box is fixed to the brush holder and is located on the outer periphery of the commutator, the inner end face of the rear cover is provided with a powder discharge groove, the brush holder covers the powder discharge groove, a gap is left between the brush holder and the commutator and communicates with the powder discharge groove, a row of powder holes is provided on the rear cover and communicates with the powder discharge groove, a deflector cover is provided on the outer end face of the rear cover, a guide groove is provided on the deflector cover and communicates with the powder discharge holes, and the guide groove extends radially along the rear cover.

[0008] Preferably, the diameter of the through hole of the brush holder is larger than the radius of the commutator, so that a gap is left between the brush holder and the commutator, and the gap is communicated with the powder discharge groove.

[0009] Preferably, the shaft of the commutator is supported in the shaft hole of the rear cover through a bearing.

[0010] Preferably, an annular boss is provided between the shaft hole and the powder discharge groove, and the annular boss is used to prevent powder from entering the shaft hole.

[0011] Preferably, the air deflector cover is a sheet metal stamping structure, one part of which forms a guide groove and the other part forms a mounting seat, and the mounting seat is fixedly connected to the rear cover by screws.

[0012] Preferably, the guide slot provided on the deflector cover opens toward the outside of the starter motor.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. A powder discharge structure is provided to discharge powder in time to prevent powder from interfering with the normal operation of the starter motor; 2. A deflector cover is provided to prevent external impurities from entering the starter motor, which may cause poor starting and failure of the starter motor; 3. A gap is provided between the commutator and the brush holder, which has strong powder discharge capacity and high efficiency, and powder is not easy to clog the powder discharge structure; 4. Only powder discharge grooves and powder discharge holes are provided on the bottom plate, and the stamped deflector cover has a simple structure and low cost; 5. The deflector cover can guide the discharged powder to avoid disordered discharge of powder and interference with the stable operation of other components; 6. This powder discharge structure can play a heat dissipation role. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 yes Figure 1 AA cross-section of

[0017] Figure 3 yes Figure 1 B-direction view;

[0018] Figure 4 yes Figure 1 C-direction view;

[0019] Figure 5 This is a schematic diagram of the brush holder assembly. DETAILED DESCRIPTION

[0020] See also Figures 1 to 5 , a powder discharge structure of a starter motor, comprising a rear cover 4 of the starter motor, a commutator 1, a brush box 2, and a brush holder 3, wherein the brush holder 3 is fixed on the inner end surface of the rear cover 4, the commutator 1 is located in a through hole provided on the brush holder 3, the through hole diameter of the brush holder 3 is larger than the radius of the commutator 1, so that a gap is left between the brush holder 3 and the commutator 1, the gap is used for passing the powder generated by the brush, and the gap is communicated with the powder discharge groove 6, the shaft 10 of the commutator 1 is supported in the axial hole 11 of the rear cover 4 by a bearing 12, and the commutator 1 and the powder discharge structure of the starter motor can generate relative rotation, the brush box 2 is fixed on the brush holder 3, this embodiment is provided with two brush boxes 2, each of which is provided with a brush, one of the brushes is a positive brush, and the other is a negative brush, the brush boxes 2 are relatively arranged on the brush holder 3, the two brush boxes 2 are located on the outer periphery of the commutator 1, the brushes provided in the brush box 2 are in close contact with the outer periphery of the commutator 1, and slide fit, the rear The inner end surface of the cover 4 is provided with a powder discharge groove 6, and an annular boss is provided between the shaft hole 11 and the powder discharge groove 6. The annular boss is used to prevent powder from entering the shaft hole 11 and affecting the rotation of the bearing 12 in the shaft hole 11. The brush holder 3 covers the powder discharge groove 6, so that the brush holder 3 and the powder discharge groove 6 present a cavity, which is used to transmit powder and prevent powder from clogging the powder discharge structure. A gap is left between the brush holder 3 and the commutator 1 to communicate with the powder discharge groove 6. The rear cover 4 is provided with a powder row hole 7 to communicate with the powder discharge groove 6, and a deflector cover 5 is provided on the outer end surface of the rear cover 4. A guide groove 8 is provided on the deflector cover 5 to communicate with the powder discharge hole 7. The deflector cover 5 is a sheet metal stamping structure, one part forms the guide groove 8, and the other part forms the mounting seat 9. The mounting seat 9 is fixedly connected to the rear cover 4 by screws. The guide groove 8 extends radially along the rear cover 4, and the guide groove 8 provided on the deflector cover 5 opens toward the outside of the starting motor to guide the discharge of powder.

[0021] The working principle of this utility model:

[0022] The commutator 1 and the brush rotate relative to each other, and powder is generated between the brush box 2 and the commutator 1. Under the influence of gravity, the powder passes through the gap between the brush holder 3 and the commutator 1 and falls into the cavity between the brush holder 3 and the powder discharge groove 6. The powder enters the guide groove 8 provided on the deflector cover 5 through the powder discharge hole 6 provided on the rear cover 4, and is discharged from the guide groove 8 to start the motor. The deflector cover 5 can be used to prevent external impurities from entering the interior of the starter motor. The powder discharge structure also has a certain heat dissipation effect.

[0023] 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 powder discharge structure for a starter motor, comprising a rear cover (4) of the starter motor, a commutator (1), a brush box (2), and a brush holder (3), wherein the brush holder (3) is fixed to the inner end surface of the rear cover (4), the commutator (1) is located in a through hole provided on the brush holder (3), the shaft (10) of the commutator (1) is supported in an axial hole (11) of the rear cover (4), the brush box (2) is fixed to the brush holder (3), and is located on the outer periphery of the commutator (1), characterized in that: The inner end surface of the rear cover (4) is provided with a powder discharge groove (6), the brush holder (3) covers the powder discharge groove (6), a gap is left between the brush holder (3) and the commutator (1) and communicates with the powder discharge groove (6), the rear cover (4) is provided with a row of powder holes (7) connected to the powder discharge groove (6), the outer end surface of the rear cover (4) is provided with a guide cover (5), the guide cover (5) is provided with a guide groove (8) connected to the powder discharge hole (7), and the guide groove (8) extends radially along the rear cover (4).

2. The powder discharge structure of the starter motor according to claim 1, characterized in that: The diameter of the through hole of the brush holder (3) is larger than the radius of the commutator (1), so that a gap is left between the brush holder (3) and the commutator (1), and the gap is communicated with the powder discharge groove (6).

3. The powder discharge structure of the starter motor according to claim 1, characterized in that: The shaft (10) of the commutator (1) is supported in the shaft hole (11) of the rear cover (4) via a bearing (12).

4. The powder discharge structure of the starter motor according to claim 1, characterized in that: An annular boss is provided between the shaft hole (11) and the powder discharge groove (6), and the annular boss is used to prevent powder from entering the shaft hole (11).

5. The powder discharge structure of the starter motor according to claim 1, characterized in that: The deflector cover (5) is a sheet metal stamping structure, one portion of which forms a guide groove (8) and the other portion forms a mounting seat (9), and the mounting seat (9) is fixedly connected to the rear cover (4) by screws.

6. The powder discharge structure of the starter motor according to claim 1, characterized in that: The guide groove (8) provided on the deflector cover (5) opens toward the outside of the starter motor.

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