BRUSH UNIT OF MOTOR

PURPOSE:To absorb vibration of brush and to prevent noise and spark, by providing a conductive vibration isolator between a holding spring and a brush or between the holding spring and a terminal of a brush unit comprising the brush holding spring and the terminal board. CONSTITUTION:A brush 1 slidably in contact with commutator segments 20 is secured to the end of a holding spring 2 through caulking of a groove 5 made in the brush 1 and the caulking section 6 of the holding spring 2. A leaf spring made of beryllium copper is employed as the holding spring 2. The holding spring 2 is coupled resiliently with a terminal 3 by fitting protrusions 8, 9 of a conductive vibration isolator 4 in the hole 7 of the holding spring 2 or the hole 10 of the terminal 3 and welding or caulking them. By such arrangement, vibration of the brush 1 is absorbed thus preventing spark and vibration. Similar effect can be achieved when the conductive vibration isolator is provided between the brush 1 and the holding spring 2.