CN2133985Y

CN2133985Y - Small motor

Info

Publication number: CN2133985Y
Application number: CN 92229945
Authority: CN
Inventors: 渊胁里香; 山田克己
Original assignee: Mabuchi Motor Co Ltd
Current assignee: Mabuchi Motor Co Ltd
Priority date: 1991-08-05
Filing date: 1992-08-04
Publication date: 1993-05-19
Anticipated expiration: 2002-08-04
Also published as: JPH0549203A

Abstract

The utility model discloses a small motor, comprising a casing, a rotor which contains an armature and a commutator, and a terminal which is installed on the open end of the casing. The casing is molded to a cylinder with a bottom and a permanent magnet is fixedly arranged on the surface of the inner circumference of the casing. The terminal is provided with an electric brush device which is contacted with the commutator by sliding and the terminal is electrically connected with the electric brush device. The rotor can be supported on a bearing arranged on the casing and an end plate by rotating. An anti-oil-spatter gasket is putting between the communtator and the end plate and is sheathed on a rotor shaft so that the anti-oil-spatter gasket is rotated together with the shaft. The anti-oil-spatter gasket is made of plastic material and forms a disk shape, and concentric grooves are arranged on the two end faces of the anti-oil-spatter gasket according to an asymmetric arranging form.

Description

Small motor

The utility model relates to the miniature motor of aspects such as being used for stereo set, precision equipment, is specifically related to have the follow-on grease proofing miniature motor that spatters packing ring that is arranged between commutator and the bearing.

Fig. 1 is one and illustrates one and have the utility model and may be implemented in the grease proofing longitudinal sectional view that spatters the miniature motor of packing ring on it.In Fig. 1, label 1 be one that use the cylinder made such as the metal material of mild steel, be shaped as a band end and have a shell that installs to the fan-shaped permanent magnet 2 of the arc on the perimeter surface in it regularly.In shell 1, be provided with one and contain one in the face of the armature 3 of permanent magnet 2 and the rotor 5 of a commutator 4.Label 6 is the end plates on the openend of being made, be installed to shell 1 by a kind of insulating material.

Label 7 is one and is arranged to make its free end to be arranged on brushgear on the end plate 6 together with commutator 4 sliding contacts and with being connected electrically to terminal 8 on it.

Label

9 and 10 is to be fixedly secured to the bearing of the axle 11 and 12 of rotor 5 on the core of the bottom of shell 1 and end plate 6 with rotatably support respectively.Label 13 is one and puts between commutator 4 and the bearing 10, is sleeved on the grease proofing packing ring that spatters to make it to rotate with the axis on the axle 12.

Adopt above-mentioned structure, when electric current when terminal 8 is fed on the armature through the commutator of brushgears 7 and rotor 5, give to be in and give a rotatory force by the armature in the 2 formed magnetic fields of the permanent magnet on the interior perimeter surface that is fixedly mounted in shell 1, rotor 5 is rotated, by the axle 11 driving external equipment (not shown) of outlet side.In this structure, the grease proofing packing ring 13 that spatters that is arranged between commutator 4 and the bearing 10 prevents that the lubricant that flows out bearing 10 from further flowing on the outer surface of commutator 4, thereby keep being electrically connected between brushgear 7 and the commutator 4, and prevent the short circuit that the irregular wear owing to the gap (not shown) of commutator 4 causes.

The grease proofing packing ring 13 that spatters about above-mentioned once proposed various suggestions.Wherein a kind of suggestion is that a disc-shaped flange is set on the neighboring of a hollow cylinder integratedly, and this disc-shaped flange has a plurality of concentric V-shaped grooves (day utility model application 44094/1976 through examination of the present disclosure) that are engraved on its front and rear surfaces.Another suggestion is that narrow groove (day utility model application 108516/1977 through examination of the present disclosure) is set on the surface of throwing oily member facing to the plate-like of bearing.These suggestions have prevented in the groove that by oil is trapped in the oil that spills bearing from adhering to (referring to Fig. 1) on the commutator 4.

The general type of miniature motor use such as the plastic material of aldehyde resin with injection moulding make grease proofing spatter packing ring exist yield poorly, problem that manufacturing cost is high.Be exactly, injection molding metal pattern die is normally very expensive, because these moulds must be high-precision, high-intensity, just can bear high injection pressure.Injection molding machine itself also is very expensive.

And, thermoplastic resin heated in heating cylinder make it fluidisation, then fluidised resin be pressed into injection moulding in the metal pattern die by injection ram or plunger and will comprise and just can obtain finished product such as extra parts such as cast gate, runners.Regular meeting reduces stock utilization like this.Because injection piston can not be extracted out after resin material is injected into metal die, before resin solidification, thereby injection moulding has low speed of production, because the frequency injection of time per unit is restricted, this has just improved the unit manufacturing cost of finished product inevitably.

The utility model is exactly to solve these intrinsic problems of the prior art.The purpose of this utility model is to provide a kind of and has a kind of process improvement to realize high stock utilization and large-duty grease proofing miniature motor that spatters packing ring.

Fig. 1 is one to have the utility model and may be implemented in the grease proofing longitudinal sectional view that spatters the miniature motor of packing ring on it.

Fig. 2 is one and is used for the grease proofing end of packing ring that spatters on the embodiment of the present utility model to view.

Fig. 3 is the cutaway view that the A-A line along Fig. 2 cuts.

Fig. 2 is one and is used for the grease proofing end of packing ring that spatters on the embodiment of the present utility model to view.Fig. 3 is the cutaway view that the A-A line along Fig. 2 cuts.In Fig. 2 and 3,

label

14a and 14b are arranged on the grease proofing groove that spatters on packing ring 13 both ends of the surface with one heart, and the groove 14a on an end face follows the groove on another end face to be provided with asymmetricly.In other words, there is not the part 15a of depression to be arranged to relative respectively with

groove

14b and 14a with 15b.

In order to form the aforesaid grease proofing packing ring 13 that spatters, it is effective adopting and being rolled into that sheet material banded, that made by thermoplastic resin material shapes by continous way multistep moulding pressing.In this case, if groove 14a shown in Fig. 2 and 3 or 14b are arranged on any end face, finished product will be owing to being out of shape along the elongation of sheet surface direction in forming process.But in this embodiment,

groove

14a and 14b are arranged on two end faces asymmetricly, balance along the elongation on the sheet surface direction, thereby prevented the finished product distortion.In addition,

groove

14a and 14b are provided with asymmetricly and help reduce internal resistance when being shaped.

In this embodiment, be described, but can on two materials,

groove

14a, 14b be set respectively by on two end faces, respectively establishing groove 14a, a 14b with a material.The cross section of

groove

14a and 14b not only can be square, can also triangular in shape, semicircle or other shape.

Has the following effect of the utlity model has of said structure and working method.

(1) because the grease proofing packing ring that spatters can be processed into by with continous way multistep shaping mould the sheet material of thermoplastic resin material being pressed, the cost of metal molding die and production equipment can reduce significantly than the packing ring with conventional injection moulding method manufacturing.

(2) stock utilization can improve significantly, and additional materials can reduce significantly, because the grease proofing packing ring that spatters can be pressed processing and go out with sheet material.

(3) productivity ratio can be than improving significantly with conventional injection moulding method.

(4) owing to above-mentioned advantageous effects, grease proofing manufacturing cost of spattering packing ring can reduce significantly.

Claims

1, a kind of miniature motor, it comprises one and is shaped as the cylinder at a band end and has a shell that is fixedly secured to the permanent magnet on perimeter surface in it, rotor that comprises armature and commutator, one and be installed on the openend of described shell and have brushgear of following described commutator sliding contact and the end plate that is connected electrically to the terminal of described brushgear; Described rotor can be rotated to support on the bearing that is arranged on described shell and the described end plate, have one grease proofing spatter packing ring be placed in described commutator with between the described bearing on the described end plate, be sleeved on and make it on the armature spindle to rotate with armature spindle; It is characterized in that this grease proofing packing ring that spatters made and be shaped as plate-like by plastic material, on its both ends of the surface, be provided with concentric groove by asymmetric arrangement form.

2,, it is characterized in that the diameter of a circle that is arranged on the center of the described groove on the described grease proofing end face that spatters packing ring is made the diameter of a circle difference with the center that is located at the described groove on the other end by the described miniature motor of claim 1.

3, by the described miniature motor of claim 1, the cross section that it is characterized in that being arranged on the described groove on the described grease proofing both ends of the surface of spattering packing ring is shaped as U-shaped basically.

4, by the described miniature motor of claim 1, it is characterized in that the described grease proofing packing ring that spatters shapes by a kind of thermoplastic resin material is pressed.