Armature, starting motor and method for manufacturing armature

Abstract

The invention discloses an armature and a starting motor containing the armature, and also discloses a method for manufacturing the armature, relating to the technical field of motors. The armature comprises an armature shaft, an armature line, an armature core lamination and a commutator, wherein the armature core lamination is fixed on the armature shaft; the armature line is inserted into the armature core lamination and connected with the commutator; the commutator comprises multiple commutating segments which are uniformly distributed around the axis of the armature shaft and not connected with each other; a bush is arranged on the armature shaft in an interference fit mode; the commutating segments and the bush are fixed into a whole; the inner wall of the bush is provided with at least one annular groove; and the bush forms fit clearance between the annular groove position and the armature shaft. According to the invention, the annular groove arranged on the inner wall of the bush can reduce the internal stress of the armature, thus the smooth working condition of the surface of the commutator can be ensured, the service life of a starter can be prolonged and the possibility of the starter failure can be reduced.

Description

technical field [0001] The invention relates to a starter motor, in particular to an armature of the starter motor and a method for making the armature. Background technique [0002] The existing starter motor structure is as follows figure 1 As shown, it includes a motor 1 that generates rotational force and is composed of a stator 110 and an armature 120, a roller type one-way clutch 2 that is splined with a drive shaft 3 of a reduction gear connected to the motor 1, and a roller type one-way clutch 2 As soon as the clutch 2 integrally moves on the gear shaft 21 along its axial direction, the driving gear 5, the relay 9, and the contacts of the relay 9 are closed, the current flows into the pull coil 11 and the holding coil 10, and attracts the moving iron core under the magnetic field generated by it. 8 Push the movable contact plate 12 to move to the electromagnetic switch 13 on the side of the static contact 14. Along with the movement of moving iron core 8, shift for...

AI Technical Summary

Problems solved by technology

from figure 2 It can be seen that the matching structure between the commutator 128 and the armature shaft 121 is: the bushing 126 embedded in the commutator 128 is fitted on the armature shaft 121 with an interference fit. The impact of accuracy varies greatly, which easily leads to excessive interference volume, which makes the bushing 126 deform and generates internal stress between the bushing 126 and the insulating packing 125 that cannot be released immediately. This internal stress is released during the working process of the starter motor, which will cause As a result, the radial runout of the contact surface between the commutator and the brush becomes larger, thereby accelerating the temperature rise of the motor. If it is light, it will cause noise in the working process and shorten the life of the starter. Dispersed machine failure

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