| 摘要 |
Carbon commutator segments (4) are secured to a base member (1) by means of integral anchor pieces (8) disposed within axially extending, cruciform-section slots (5) formed in the outer cylindrical surface (2) of an insulating base member (1). Elongate contact members (3) having lateral edges (10) seated in lateral parts (13) of the slots (5) are embedded in the anchor pieces (8) and are each provided, at one end, with a terminal (15) for connection to an armature winding lead wire (16). The carbon segments (4) and the integral anchor pieces (8) are formed by enclosing the base member (1), together with assembled contact members (3), in a mould and then injecting a mouldable mixture of carbon powder and carrier material into the space between the mould and the assembly. When the injection moulded layer has solidified, an annular-section outer portion of this injection moulded layer is divided into segments (4) by means of axially-extending radial cuts (25). Holes (12), formed in a central part of each contact member (3), facilitate the flow of mouldable mixture and ensure that the mouldable mixture fills that part of each slot (5) which is not occupied by the contact member (3) disposed within the slot (5). <IMAGE> |
