Brush for an electric motor
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Dec 21, 2015
filing date -
Dec 31, 2014
priority date (Note) -
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Abstract
A brush for an electric motor has a brush body having a front end surface configured to make sliding electrical contact with a commutator of the motor. First and second side surfaces are connected to the front end surface. The first side surface and the second side surface are positioned on opposite sides of the brush body in a rotational direction of the commutator. The front end surface has a first contact surface and a second contact surface that contact the commutator earlier than other regions of the front end surface, and are respectively positioned on diametrically opposed corners of the front end surface. In an initial state, the width of the contact area between the brush and the commutator is increased to extend the commutation time.
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