Carbon brush for truck starting motor as well as manufacture method and application thereof

Abstract

The invention discloses a carbon brush for a truck starting motor as well as a manufacture method and application thereof. The carbon brush at least contains carbon as one component of a carbon brush main body, the carbon brush main body comprises graphite powder, electrolytic copper powder, a solid lubricating agent and a binding agent, and the carbon brush contains phosphoric acid and is of a double-layer pressing structure. In the carbon brush for the truck starting motor, a definite quantity of phosphoric acid is added when gel powder is prepared, which is beneficial to the formation of a uniform lubricating film on the surface of a motor commutator; and through the self-lubricating action of the lubricating film, the service life of the electric brush can be prolonged. The double-layer pressing structure is adopted, and two layers contain different copper quantities, high conductivity of the carbon brush is ensured through conductivity of the high-copper-content layer; and the sparks of the carbon brush during working are reduced through the low-copper-content layer, and the service life of the carbon brush is ensured through wear resistance of the low-copper-content layer.

Description

technical field

[0001] The invention relates to a carbon brush for a motor, in particular to a carbon brush for a truck starter motor and its manufacturing method and application. Background technique

[0002] When the high-power truck starter motor is working, the speed is required to be above 30,000rpm, and the working current is required to be above 700A, so that the brushes are required to withstand 350A / cm 2 Above the current density, and the service life is more than 40,000 times. Although the traditional single-layer structure carbon brush can meet the use requirements in terms of current density, but because the copper content in the carbon brush is too high, the sparks generated when the motor is working are relatively large, so the life of the carbon brush cannot meet the use requirements. Contents of the invention

[0003] Purpose of the invention: The present invention is to overcome the above-mentioned deficiencies, and the technical problem to be solved is t...

Examples

Embodiment 1

[0025] Graphite powder 78%, phenolic resin 20%, phosphoric acid 2%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by twice feeding method, and sample 1 was produced through high temperature heat treatment at 750°C.

Embodiment 2

[0027] Graphite powder 76%, phenolic resin 20%, phosphoric acid 4%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, and then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by two feeding methods, and sample 2 was produced through a high temperature heat treatment at 750°C.

Embodiment 3

[0029] Graphite powder 73%, phenolic resin 20%, phosphoric acid 7%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by twice feeding method, and sample 3 was prepared by high temperature heat treatment at 750°C.

technical field

[0001] The invention relates to a carbon brush for a motor, in particular to a carbon brush for a truck starter motor and its manufacturing method and application. Background technique

[0002] When the high-power truck starter motor is working, the speed is required to be above 30,000rpm, and the working current is required to be above 700A, so that the brushes are required to withstand 350A / cm 2 Above the current density, and the service life is more than 40,000 times. Although the traditional single-layer structure carbon brush can meet the use requirements in terms of current density, but because the copper content in the carbon brush is too high, the sparks generated when the motor is working are relatively large, so the life of the carbon brush cannot meet the use requirements. Contents of the invention

[0003] Purpose of the invention: The present invention is to overcome the above-mentioned deficiencies, and the technical problem to be solved is t...

Examples

Embodiment 1

[0025] Graphite powder 78%, phenolic resin 20%, phosphoric acid 2%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by twice feeding method, and sample 1 was produced through high temperature heat treatment at 750°C.

Embodiment 2

[0027] Graphite powder 76%, phenolic resin 20%, phosphoric acid 4%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, and then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by two feeding methods, and sample 2 was produced through a high temperature heat treatment at 750°C.

Embodiment 3

[0029] Graphite powder 73%, phenolic resin 20%, phosphoric acid 7%, after mixing at room temperature for 0.5 hours, add 30% (based on dry powder weight) alcohol, mix at 90-100°C for 1 hour, then crush , and sieved to obtain a one-stage colloidal powder. The first-stage colloidal powder 39%, copper powder 58%, molybdenum disulfide 3%, mixed at room temperature for 1 hour to make pressed powder A; the first-stage colloidal powder 70%, copper powder 27%, molybdenum disulfide 3% , and mixed at room temperature for 1 hour to make compressed powder B. Compressed powder A and compressed powder B were pressed into a double-layer product under a unit pressure of 4 MPa by twice feeding method, and sample 3 was prepared by high temperature heat treatment at 750°C.

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