CN202353365U - Double sliding bearing type direct current motor - Google Patents

Abstract

The utility model discloses a double sliding bearing type direct current motor, which comprises a motor shaft, a motor casing component and an iron cover component. Both of the motor casing component and the iron cover component comprise bearings, the motor shaft and the bearings are axially and concentrically assembled, and the bearings are sliding bearings. Compared with direct current motors with rolling bearings, the double sliding bearing type direct current motor has the advantages that manufacturing process of assembly bearing seats is reduced, production time is shortened, bearing seat materials are decreased, and manpower and material costs are saved, thereby the improvement of economic benefits of motormakers is facilitated; the sliding bearings are large in bearing capacity, good in smoothness and high in shock resistant capability so that reduction of vibration and noise of the motors is facilitated; the sliding bearings are insensitive to metal foreign matters, early damage is not easily generated, lubricating oil in the bearings seeps out during the movement process so that a self-lubricating function is achieved, friction is reduced, and service life of the motors is prolonged; and the sliding bearings are simple in structure and small in space occupation so that the direct current motor with the sliding bearings is enabled to be compact in structure.

Description

Two sliding bearing formula direct current machines

Technical field

The utility model relates to the dc motor technology field, relates in particular to the application of sliding bearing in direct current machine, specifically is a kind of pair of sliding bearing formula direct current machine.

Background technology

At present, in the direct current machine industry, passive bearing adopts traditional mode always; Unalterable all selections rolling bearing, this mainly is that what the dimensional accuracy of part was controlled is not fine because of the defective of former China on manufacturing technology; All do not reach the direct current machine permissible accuracy as circularity, concentric, thus be not widely used at direct current machine industry sliding bearing, and rolling bearing is by general application; Because the face of rolling bearing and housing contacts is a sphere, can rotate, have aligning property; Not just can not adjust axle center that deflection or decentraction because of axle or shell cause automatically, thus to precision require relatively low.This also just defective produce part, can bump in the process of aligning, produce noise and vibration, therefore for the high motor of precision requirement, rolling bearing is difficult to meet the demands.

In addition, rolling bearing 5 needs bearing pedestal 6 and supports, the structure more complicated of bearing pedestal 6, and production process operation trouble (like Fig. 1, shown in 2) has also increased production man-hour simultaneously, and this has increased the human and material resources cost of production firm undoubtedly.

In addition, the sliding bearing of the same volume of ability force rate that rolling bearing bears load is much little, and therefore, the radial dimension of rolling bearing is big.So, the occasion of bearing big load with require the occasion that radial dimension is little, structural requirement is compact (like DC micromotor), rolling bearing just is not suitable for.Bearing vibration and noise are bigger; Particularly using the later stage particularly remarkable, therefore, very high to precision requirement, again the occasion of vibration mustn't be arranged; Rolling bearing is difficult to be competent at; Picture automobile trunk equipment (TOCD, TRUNK OPENING AND CLOSING DEVICE) motor generally selects for use the effect of sliding bearing better.And in a single day rolling bearing is responsive especially to foreign matters such as metal fillingss, gets into foreign matter in the bearing, will produce bigger intermittently vibration and noise, also can cause early stage damage, and stuck phenomenon can appear in motor when serious, causes motor to lose efficacy.In addition, rolling bearing also is prone to the early stage possibility of damaging takes place because of metal clip impurity etc., even early stage damage does not take place, the rolling bearing impact resistance is relatively poor, occur noise during high speed, working life is not as the sliding bearing of hydrodynamic lubrication.

The utility model content

To the problems referred to above, the utility model aims to provide a kind of pair of sliding bearing formula direct current machine, compactness rational in infrastructure; Can obviously improve the shock resistance of product; Increase load-carrying ability, reduce noise and vibration, reduce the influence that metallic foreign body causes; Can reduce production process again, shorten life cycle of the product, manufacturer's production cost is reduced.

For realizing this technical purpose; The scheme of the utility model is: a kind of pair of sliding bearing formula direct current machine; Comprise motor shaft, motor case assembly and iron covering assembly; Said case component and iron covering assembly all comprise bearing, the axial concentric fits of said bearing and motor shaft, and said bearing is sliding bearing.

As preferably, said case component is embedded in the built-in Bearing Installation position of casing by sliding bearing and forms.

As preferably, said iron covering assembly is embedded in the built-in Bearing Installation position of iron covering by sliding bearing and forms.

Compare with rolling bearing, the utlity model has following advantage: reduced assembled shaft bearing manufacturing process, shortened production man-hour, reduced the bearing pedestal material, practiced thrift the human and material resources cost, thereby helped improving the economic benefit of electrical machinery plant; Therefore the sliding bearing loading capability is big, and stationarity is good, and strong shock resistance helps reducing the vibration and the noise of motor; Sliding bearing is insensitive to metallic foreign body, is difficult for producing early stage damage, and the lubricating oil in the motion process middle (center) bearing oozes out, and self-lubricating function is arranged, and reduces friction, and helps improving the working life of motor; The sliding bearing structure form is simple, and it is little to take up room, and is used for direct current machine and makes its compact conformation.

Description of drawings

Fig. 1 uses rolling bearing assembling explosive view for the iron covering assembly;

Fig. 2 uses rolling bearing assembling explosive view for case component;

The two sliding bearing formula direct current machine sketch mapes of Fig. 3 the utility model;

Fig. 4 uses sliding bearing assembling explosive view for the iron covering assembly;

Fig. 5 uses sliding bearing assembling explosive view for case component.

Embodiment

The utility model inventive embodiments provides a kind of pair of sliding bearing formula direct current machine, can reduce cost, and improves the working life of motor, strengthens impact resistance, reduces vibration and noise.Below in conjunction with accompanying drawing and specific embodiment the utility model is explained further details.

A kind of pair of sliding bearing formula direct current machine of the utility model; As shown in Figure 3, it comprises motor shaft 1, motor case assembly 3 and iron covering assembly 2, and said case component 3 all comprises bearing with iron covering assembly 2; The axial concentric fits of said bearing and motor shaft, said bearing is sliding bearing 4.Case component 3 is embedded in the built-in Bearing Installation position of casing by sliding bearing 4 and forms (as shown in Figure 5).Iron covering assembly 2 is embedded in the built-in Bearing Installation position of iron covering by sliding bearing 4 and forms (as shown in Figure 4).

Its basic principle is: direct current machine generally is made up of three parts: armature portion (rotor and motor shaft), housing part (stator), end cap (Jiao Gai+iron covering) part.Motor armature portion in the course of the work is in rotation status, and the part that supports the armature rotation promptly is a bearing, and iron covering assembly and case component have a bearing respectively.The described pair of sliding bearing formula direct current machine is meant that supporting the bearing that armature rotates all selects sliding bearing for use, and promptly the bearing of iron bonnet and housing part all is sliding bearings.

Described motor case partly is a stationary part, and its component part generally has casing, magnetite, and catapult also has bearing.Described iron covering part generally has iron covering and bearing, and the motor among Fig. 3 is an instance of the utility model invention, and Fig. 3 middle (center) bearing all is to select sliding bearing for use.The sliding bearing form is simple, and contact area is big, and the supporting & stablizing performance is good and the self-lubricating ability is arranged, because of its material is porous matter characteristic, and can storing lubricating oil.Being stored in lubricating oil in the hole is in operation and from the hole, oozes out and be lubricated at rubbing surface; Under certain condition; Might between axle journal and working surface, set up the dynamic pressure oil film of certain bearing capacity; In a single day operation stops, oil just is inhaled in the hole again and stores, so can carry out lubricated for a long time with a spot of oil.Because oiliness bearing need not add lubricating oil and not leak, and therefore is applicable to the occasion of not refueling the space and leakage can not be arranged.If lubricated keep good, abrasion resistance can be fine, and the bearing working life-span also can be very long, and the bearing capacity of sliding bearing is big, and rotating accuracy is high, and lubricating film has the shock resistance effect, and sliding bearing is insensitive to metallic inclusion, and therefore vibration and noise are smaller.Particularly for precision, the strict microminiature direct current machine of noise, like automobile chair back motor, the headrest motor, these occasions use sliding bearings proper.Sliding bearing structure is simple, and assembling process is also uncomplicated, and processing cost is lower than rolling bearing.The above characteristic of sliding bearing makes the utility model effectively reach the purpose of aforementioned invention.

The above; Be merely the preferred embodiment of the utility model; Not in order to restriction the utility model, every technical spirit according to the utility model to any trickle modification that above embodiment did, be equal to replacement and improve, all should be included within the protection range of the utility model technical scheme.

Claims (3)

1. a two sliding bearing formula direct current machine comprises motor shaft, motor case assembly and iron covering assembly, and said case component and iron covering assembly all comprise bearing, it is characterized in that: the axial concentric fits of said bearing and motor shaft, said bearing is sliding bearing.

2. direct current machine according to claim 1 is characterized in that: said case component is embedded in the built-in Bearing Installation position of casing by sliding bearing and forms.

3. direct current machine according to claim 1 is characterized in that: said iron covering assembly is embedded in the built-in Bearing Installation position of iron covering by sliding bearing and forms.

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