Starter capable of improving insulating property

Abstract

The utility model discloses a starter capable of improving insulation performance, which comprises a shell, a motor arranged in the shell, the motor comprises a circuit board, a rotor and a rear cover, the shell is provided with a mounting hole for mounting the rotor, the rotor and the circuit board are mounted in the mounting hole, a carbon brush holder is mounted on the circuit board, and a carbon brush sliding along the carbon brush holder is arranged in the carbon brush holder. The end part of the carbon brush is in contact with a commutator of the rotor, the rear cover covers an opening of the mounting hole, an insulating sheet is arranged between the carbon brush holder and the rear cover, the insulating sheet is annular, the rear cover is provided with a positioning groove matched with the insulating sheet, the insulating sheet is mounted in the positioning groove, and the insulating sheet covers a gap between the commutator and the carbon brush holder. Therefore, the technical effect of avoiding short circuit between the circuit board and the shell is achieved.

Description

Technical Field

[0001] The utility model relates to a starter field, in particular to a starter with improved insulation performance. Background Art

[0002] The starter of an automobile is mainly used for starting the automobile engine. Its main structure includes a motor, an electromagnetic component and a one-way clutch. Especially in the position of the motor, due to long-term use, there will be powder generated by the wear of the carbon brushes in the brush holder assembly of the motor. These powders have conductive properties, and the powders will cause the circuit board to conduct electricity with the housing, resulting in a short circuit and damaging the motor. At the same time, when the motor starts, it will generate high temperature, and the high temperature will affect the deformation of the PCB material in the circuit board. In extreme cases, the carbon brushes will also protrude and conduct electricity with the housing short circuit, which will also damage the motor. Summary of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide a starter with improved insulation performance that avoids short circuit between the circuit board and the housing.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a starter with improved insulation performance, including a housing. A motor is arranged inside the housing. The motor includes a circuit board, a rotor and a rear cover. The housing is provided with an installation hole for installing the rotor. The rotor and the circuit board are installed in the installation hole. A carbon brush holder is installed on the circuit board. A carbon brush that slides along it is arranged inside the carbon brush holder. The end of the carbon brush contacts the commutator of the rotor. The rear cover covers the opening of the installation hole. An insulating sheet is arranged between the carbon brush holder and the rear cover. The insulating sheet is annular. A positioning groove adapted to the insulating sheet is arranged on the rear cover. The insulating sheet is installed in the positioning groove. The insulating sheet covers the gap between the commutator and the carbon brush holder.

[0005] A convex ring is further arranged on the peripheral wall of the insulating sheet, and the convex ring covers the inner peripheral wall of the positioning groove.

[0006] The insulating sheet is made of plastic material.

[0007] The beneficial effect of the utility model is that the powder generated by the wear of the carbon brush can be blocked in the housing by the insulating sheet, avoiding contact with the rear cover structure. At the same time, the high temperature generated after the rotor starts causes the circuit board to deform, resulting in the carbon brush extending towards the rear cover direction, and there is no risk of short circuit. In this way, the technical effect of avoiding short circuit between the circuit board and the housing is achieved.

[0008] The following further describes the utility model in conjunction with the drawings and specific embodiments. Brief Description of the Drawings

[0009] Figure 1 It is a three-dimensional view of the specific embodiment of the utility model;

[0010] Figure 2 is Figure 1 an enlarged view of A in;

[0011] Figure 3 is a three-dimensional view of the insulating sheet in the specific embodiment of the present invention.

[0012] In the figure, 1 is the housing; 2 is the circuit board; 3 is the rotor; 4 is the rear cover; 5 is the carbon brush holder; 51 is the carbon brush; 6 is the positioning groove; 7 is the insulating sheet. Specific Embodiment

[0013] The present invention will be specifically described below through embodiments, which are only used for further illustration of the present invention and cannot be construed as limiting the protection scope of the present invention.

[0014] As Figure 1 — Figure 3 shown, this embodiment discloses a starter for improving insulation performance, including a housing 1. A motor is arranged inside the housing 1. The motor includes a circuit board 2, a rotor 3 and a rear cover 4. The housing 1 is provided with an installation hole for installing the rotor 3. The rotor 3 and the circuit board 2 are installed in the installation hole. A carbon brush holder 5 is installed on the circuit board 2. A carbon brush 51 that slides along it is arranged inside the carbon brush holder 5. The end of the carbon brush 51 contacts the commutator of the rotor 3. The rear cover 4 covers the opening of the installation hole. An insulating sheet 7 is arranged between the carbon brush holder 5 and the rear cover 4. The insulating sheet 7 is in a circular ring shape. The rear cover 4 is provided with a positioning groove 6 adapted to the insulating sheet 7. The insulating sheet 7 is installed in the positioning groove 6. The insulating sheet 7 covers the gap between the commutator and the carbon brush holder 5.

[0015] The insulating sheet 7 is made of plastic material. Of course, a thick paper material can also be used, so as to achieve a reliable insulation effect.

[0016] A convex ring 71 is also arranged on the peripheral wall of the insulating sheet 7. The convex ring 71 covers the inner peripheral wall of the positioning groove 6, so as to further improve the isolation between the carbon brush holder 5 and the rear cover and improve the insulation effect.

[0017] Both the rear cover and the housing are made of aluminum material. The rear cover and the housing cooperate to form a complete housing.

[0018] Adopting the above technical solution, the powder generated by the wear of the carbon brush 51 can be blocked inside the housing 1 by the insulating sheet 7, avoiding contact with the structure of the rear cover 4. At the same time, the high temperature generated after the rotor 3 starts causes the circuit board 2 to deform, resulting in the carbon brush protruding towards the rear cover 4, and there is no risk of short circuit. In this way, the technical effect of avoiding short circuit between the circuit board 2 and the housing 1 is achieved, and the service life of the starting motor is greatly improved.

[0019] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0020] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 starter motor for improving insulation performance, comprising a housing, a motor is arranged inside the housing, the motor includes a circuit board, a rotor and a rear cover, the housing is provided with an installation hole for installing the rotor, the rotor and the circuit board are installed in the installation hole, a carbon brush holder is installed on the circuit board, a carbon brush sliding along it is arranged inside the carbon brush holder, the end of the carbon brush contacts the commutator of the rotor, the rear cover covers the opening of the installation hole, and is characterized in that: An insulating sheet is provided between the carbon brush holder and the rear cover. The insulating sheet is annular, and the rear cover is provided with a positioning groove adapted to the insulating sheet. The insulating sheet is installed in the positioning groove, and the insulating sheet covers the gap between the commutator and the carbon brush holder.

2. The starter for improving insulation performance according to claim 1, characterized in that: A convex ring is further provided on the peripheral wall of the insulating sheet, and the convex ring covers the inner peripheral wall of the positioning groove.

3. The starter for improving insulation performance according to claim 1, characterized in that: The insulating sheet is made of plastic.

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