Carbon brush for an electrical machine in a vehicle

• US 6,268,679 B1
• Filed: 02/28/2000
• Issued: 07/31/2001
• Est. Priority Date: 03/24/1999
• Status: Expired due to Fees

• Current Assignee: MERSEN Deutschland FFM AG (Mersen SA)
• Original Assignee: MERSEN Deutschland FFM AG (Mersen SA)
• Inventors: Joly, Emmanuel, Reynvaan, Conrad
• Primary Examiner(s): Nguyen, Tran
• Application Number:
  US09/514,373
• Time in Patent Office: 519 Days
• Field of Search: 310/248, 310/251, 310/252, 310/253, 310/233, 295/96--98, 252/503, 252/510, 252/511, 264/104-105
• US Class Current: 310/248
• CPC Class Codes: H01R 39/20 characterised by the material thereof
• CPC Class Codes: H01R 39/26 Solid sliding contacts, e.g. carbon brush

Abstract

The invention relates to carbon brushes for electrical machines with commutator in a vehicle with a 36 volt electrical system. According to the invention, the specific electrical resistance of a carbon brush that can be used in a starter motor is greater than 1,000 μΩcm, the specific electrical resistance of a carbon brush that can be used in an auxiliary electric motor or an alternator is greater than 10,000 μΩcm, and the specific electrical resistance of a carbon brush that can be used in a fuel pump motor is greater than 20,000 μΩcm.

Claims

1. A carbon brush for an electrical machine with a commutator in a vehicle having a 36 volt electrical system, wherein the electrical machine is a starter motor, and the carbon brush has a specific electrical resistance greater than 1,000 μ

Ω

cm.

2. A carbon brush for an electrical machine with a commutator in a vehicle having a 36 volt electrical system, wherein the electrical machine is one of an auxiliary electrical motor and an alternator, and the carbon brush has a specific electrical resistance greater than 10,000 μ

Ω

cm.

3. A carbon brush for an electrical machine with a commutator in a vehicle having a 36 volt electrical system, wherein the electrical machine is a fuel pump motor, and the carbon brush has a specific electrical resistance greater than 20,000 μ

Ω

cm.

4. In a vehicle including a 36 volt electrical system, the improvement comprising an electrical machine with a commutator, the electrical machine being a starter motor comprising a carbon brush of specific electrical resistance greater than 1,000 μ

Ω

cm.

5. In a vehicle including a 36 volt electrical system, the improvement comprising an electrical machine with a commutator, the electrical machine being one of an auxiliary electric motor and an alternator comprising a carbon brush of specific electrical resistance greater than 10,000 μ

Ω

cm.

6. In a vehicle including a 36 volt electrical system, the improvement comprising an electrical machine with a commutator, the electrical machine being a fuel pump motor comprising a carbon brush of specific electrical resistance greater than 20,000 μ

Ω

cm.