轨道36设于凹槽21内，用 于引导电刷20至换向器，且电刷在一预先确定的运动范围内可沿所述轨道自 由滑动。
The tracks 36 are arranged in the grooves 21 and are used for guiding the electric brush 20 to the reverser, and the electric brush can slide freely along the tracks in a predetermined movement range.
轨道36设于凹槽21内，用 于引导电刷20至换向器，且电刷在一预先确定的运动范围内可沿所述轨道自 由滑动。
The tracks 36 are arranged in the grooves 21 and are used for guiding the electric brush 20 to the reverser, and the electric brush can slide freely along the tracks in a predetermined movement range.
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