| 摘要 |
A self-supporting brush holder assembly 10 is disposed on the cylindrical outer surface of a shaft 20 of a viscous fan drive 11 which is rotatable about an axis of rotation 25. The brush holder assembly includes a first portion 12 having a generally C-shaped concave surface 16 and a second portion 14 having a generally C-shaped concave surface 18 which is adaptable to mate with the generally C-shaped concave surface of the first portion to define an annular surface 28 defining a cylindrical opening having its longitudinal axis adapted to be disposed coaxial to the axis of rotation. The cylindrical opening is adapted to surround the cylindrical outer surface of the shaft 20 with the annular surface 28 being disposed contiguous to the cylindrical outer surface of the shaft 20 to support the first and second portions 12, 14 on the shaft 20 to prevent radial movement between the shaft and the first and second portions. The brush holder 10 includes channels 44 located in one of the first and second portions disposed in a generally radial direction and brush members 22 and 24 are located in the channels and are biased in a radially inwardly direction so that one brush member engages with a commutating ring located on the shaft and the other brush member engages with the outer surface of the shaft. The shaft 20 includes an annular groove 50 therein and the annular surface 28 includes a complementary annular land 48 thereon which is adapted to be received in the annular groove 50 of the shaft 20 to positively locate the brush holder relative to the shaft and prevent movement in an axial direction therebetween. A tether member 58 is secured to one portion of the brush holder at one end thereof and is adapted to be secured to a fixed member 64 at the opposite end thereof to prevent rotation of the first and second portions upon rotation of the shaft. |
