JPS60194739A - Commutator motor - Google Patents

Abstract

PURPOSE:To prevent oil exhausted from a bearing from scattering by forming an irregular surface on the side of a commutator side of a bearing. CONSTITUTION:A bearing 3a is provided at the periphery with a felt 12a impregnated with oil, and secured by metal fittings 13a together with the felt to a bracket 4b. When a load of rotor axial direction is applied in this construction, the oil-impregnating sintered alloy bearing 3a discharges oil to the upper end of a projection 14, but most oil remains in a recess 15. Since the bearing 3a is not rotated, the oil accumulated in the recess 15 is not scattered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a commutator motor having a commutator fixed to a rotor shaft and a bearing that pivotally supports the rotor shaft.

Conventional Structure and Problems Conventionally, as shown in FIG. 1, this type of commutator motor has a field winding 1 mounted on a field core 2, and a bearing portion 3 disposed within the field core 2. A rotor shaft 8 to which a rotor core 6 having a rotor winding 5 and a commutator 7 are press-fitted is attached to a bearing portion such that the rotor core 6 faces the field core 2. A brush 1 is pivotally supported by a brush holder 9 and is held by a brush holder 9 so as to be in contact with a side surface of the commutator 7.
The axial movement of the rotor shaft 8 is generally restricted by the commutator 7 press-fitted into the rotor shaft 8 and the bearings 3 and 3'. A friction buffer material 11 such as a lymph was interposed between the bearing portions 3, 3' and the commutator 7.

In addition, for home appliances such as juicers and mixers, the rate of
It is often used at a rotation speed of 20,000 to 20,000 rotations, and moreover, due to cost considerations, a bearing made of oil-impregnated sintered alloy is often used for the bearing portion 3.3'. This oil-impregnated sintered alloy bearing part 3, 3
′ means that when pressure or temperature is applied, the oil that has seeped into the inside oozes out to the surface and forms an oil film on the sliding surface, resulting in smooth sliding.
3' to the thrust bearing is a surface Friction buffer material such as a lymph 1
The oil that came out on the 1 side was transmitted to the friction cushioning material 11 and was scattered due to the centrifugal force.

Then, there are problems in that the splashed oil adheres to the brush 10 or the commutator 7, leading to poor rectification, or it adheres to the commutator 7, which is a high-temperature part, emitting a strange odor.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a commutator motor that can prevent oil from scattering from a bearing without using special parts.

Structure of the Invention In order to achieve the above object, the commutator motor of the present invention comprises a field core provided with a field winding, a bracket having a bearing portion and fixed to the field core, and a rotor winding. A rotor shaft is press-fitted with a rotor core and a commutator, and is pivotally supported by a bearing so that the rotor core faces the field core; and a brush held by a brush holder fixed to a placket, and an unevenness is provided on the side surface of the bearing portion on the commutator side. According to this configuration, when the rotor shaft rotates, the bearing portion The oil coming out from the bearing part is collected in the recessed part of the bearing part, and the scattering of the oil can be reduced.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 2, the bearing portion 3a is surrounded by an oil-impregnated felt 12a, and is fixed together with the felt to the bracket 4b by a stopper 13a. A convex portion 14 is provided on the side surface of the bearing portion 3a on the commutator side. When a load is applied in the axial direction of the rotor in this configuration, the oil-impregnated sintered alloy bearing 3& releases oil also to the upper end surface of the convex portion 14, but most of the oil remains in the concave portion 16. Since the bearing portion 3a is not rotating, the oil accumulated in the recess 15 does not scatter. At this point, it feels like the amount of oil on the friction surface is decreasing, but in reality, an oil film is sufficient and no more is needed. Further, the excess oil that comes out is absorbed by the felt 12a through the recess 15 and returned to the bearing 3a again.

In particular, in users, mixers, etc., the rotor shaft of the commutator motor is often used in the vertical direction, and the recess 15 is located at a lower level than the end surface of the convex part 14 and easily functions as an oil groove. Effects As is clear from the description of the above embodiments, the commutator motor of the present invention reduces the scattering of oil coming out of the bearing by providing unevenness on the side surface of the bearing on the commutator side. , which can prevent poor rectification in the commutator section and the occurrence of strange odors.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional commutator motor, and FIG. 2 is a partial sectional view of a commutator motor showing an embodiment of the present invention. 3a... Bearing part, 41L... Placket, 14 pa. ...Convex portion, 15...Concave portion. Figure 1

Claims (1)

[Claims] A field core provided with field windings, a bracket having a bearing portion and fixed to the field core, a rotor core provided with rotor windings, and a commutator press-fitted and fixed thereto, and the rotor A rotor shaft supported by a bearing part so that the iron core faces the field iron core, and a brush held by a brush holder fixed to the bracket so as to come into contact with a side surface of the commutator. , a commutator motor in which unevenness is provided on a side surface of the bearing portion on the commutator side.