CN221081036U - Brush motor and electric appliance comprising same - Google Patents

Abstract

The utility model provides a brush motor and an electric appliance comprising the same. The brush motor comprises a motor shaft, a commutator and an oil-containing bearing, wherein the commutator and the oil-containing bearing are arranged on the motor shaft, the brush motor further comprises an oil blocking assembly, the oil blocking assembly is arranged on the motor shaft and coaxially rotates with the motor shaft, the oil blocking assembly is positioned between the commutator and the oil-containing bearing, and the oil blocking assembly is made of a ductile material and is in interference fit with the motor shaft. According to the utility model, the oil baffle component is made of a ductile material and is arranged on the motor shaft in an interference fit manner, so that the tightness of the contact surface of the oil baffle component and the motor shaft is greatly improved, the effect of preventing bearing oil of the oil-containing bearing from penetrating into the commutator groove is achieved, the commutator groove is kept clean, and carbon powder is not easy to adsorb to form accumulation.

Description

Brush motor and electric appliance comprising same

Technical Field

The utility model relates to a brush motor and an electric appliance comprising the same.

Background

Currently, brush motors typically employ oil-containing bearings to provide bearing oil for lubricating the motor shaft, typically by providing oil retainers to block the flow of lubricant to the commutator. Specifically, the oil-retaining bearing is sintered metal produced by a powder metallurgy method, is a porous material, and is similar to a sponge body, and the sponge body is filled with lubricating oil. When the motor is not in operation, oil is mainly present in the sponge; when the motor starts to run, the bearing gap can generate negative pressure and friction heat, under the action of negative pressure and thermal expansion, bearing oil can be separated out from the sponge body to fill up the gap between the oil-containing bearing and the motor shaft, an oil film is formed, a good lubricating effect is achieved, and part of oil can flow to the contact surface of the oil retaining ring and the oil-containing bearing. When the motor stops running, bearing oil in the gap between the oil-containing bearing and the motor shaft can flow back to the inside of the sponge body of the oil-containing bearing for storage.

In the prior art, the oil retaining ring is made of bakelite, and because the bakelite is not tough, the contact surface is still in point contact even though the inner hole of the oil retaining ring is in interference fit with the shaft, and a plurality of holes exist on the contact surface. When the motor runs, lubricating oil in the oil-containing bearing is separated out from a bearing 'sponge' under the action of negative pressure, and although bakelite can absorb a part of lubricating oil, after the bakelite is absorbed and saturated, the lubricating oil can penetrate into the reversing end face of the reverser along the shaft through the pores of the oil retaining ring made of bakelite material, and then penetrates into the reverser groove from the reversing end face.

Specifically, when the motor is running, a portion of the bearing clearance will flow to the oil deflector. When the rotating speed of the motor is higher, for example, is more than 5000RPM, oil can be dispersed and distributed towards the outer ring of the oil baffle ring under the action of centrifugal force, and the oil cannot pass through the holes of the bakelite oil baffle ring, so that the bakelite oil baffle ring has good oil-proof effect on the high-rotating-speed motor; however, when the motor speed is lower than 3000RPM, especially when the pushrod speed is only 1000 more revolutions, the centrifugal force is small, and the oil flowing from the bearing clearance can be mainly distributed near the inner hole of the oil baffle ring. After a period of use, the oil slowly permeates from the inner hole of the bakelite oil baffle ring to the reversing end face of the reverser, fills up the gap between the reversing end face and the oil baffle ring, and then slowly permeates a part of the gap into the groove (reverser groove) of the reverser.

When the motor works, the carbon brush and carbon powder generated by the commutator collide and rebound at high speed in the motor. When bearing oil is arranged in the commutator groove, carbon powder can be adhered and adsorbed to the commutator groove, especially when the rotating speed is low, the carbon powder in the commutator groove cannot be thrown away due to the small centrifugal force, carbon deposition accumulation is formed in the long time (if the rotating speed is high, even if oil is arranged in the commutator groove, the carbon powder is not easily adsorbed due to the large centrifugal force), the short circuit of a brush motor is caused, and the normal use of electric appliances (such as a range hood, a floor washer, a soymilk machine, a wall breaking machine and the like) adopting the brush motor is influenced.

Disclosure of utility model

The utility model aims to overcome the defect that in the prior art, the contact surface of an oil retaining ring, which is made of bakelite, is in point contact with a shaft and cannot prevent lubricating oil of an oil-containing bearing from penetrating into a commutator groove, and provides a brush motor and an electric appliance comprising the brush motor.

The utility model solves the technical problems by the following technical scheme:

The brush motor comprises a motor shaft, a commutator and an oil-containing bearing, wherein the commutator and the oil-containing bearing are arranged on the motor shaft, the brush motor is characterized by further comprising an oil blocking assembly, the oil blocking assembly is arranged on the motor shaft and coaxially rotates with the motor shaft, the oil blocking assembly is positioned between the commutator and the oil-containing bearing, and the oil blocking assembly is made of a ductile material and in interference fit with the motor shaft.

In this technical scheme, through setting up the material that keeps off oily subassembly and be ductile material to keep off oily subassembly and install on the motor shaft with interference fit, thereby improved the leakproofness that keeps off the contact surface of oily subassembly and motor shaft greatly, reached and stop the bearing oil infiltration of oiliness bearing to the commutator groove, make the commutator groove keep clean, be difficult for adsorbing the carbon dust and form accumulational beneficial technical effect.

Preferably, the outer diameter of the oil blocking component is larger than the outer diameter of the commutator; and/or, the dimension of the oil baffle component along the axial direction is more than or equal to 2mm.

In the technical scheme, the outer diameter of the oil blocking assembly is larger than that of the commutator, so that lubricating oil of the oil-containing bearing can be blocked from flowing to the commutator from the outside of the oil blocking assembly. Through setting up the oil retaining subassembly along axial size more than or equal to 2mm, can further strengthen the leakproofness that keeps off the oil component.

Preferably, the oil blocking assembly comprises a first oil blocking part and a second oil blocking part which are attached, wherein the first oil blocking part and the second oil blocking part are both installed on the motor shaft and are in interference fit with the motor shaft;

The first oil blocking component is of a conical round platform structure, the first oil blocking component comprises a first end and a second end which are oppositely arranged along the axial direction, the diameter of the second end is larger than that of the first end, the first end faces the oil-containing bearing, and the second end faces the commutator;

The second oil blocking component is of a sheet structure, the second oil blocking component is located between the first oil blocking component and the commutator, and the outer diameter of the second oil blocking component is larger than that of the second end of the first oil blocking component.

In this technical scheme, through setting up the concrete structure who keeps off oily subassembly, can improve the fender oily effect that keeps off oily subassembly greatly. Furthermore, the oil blocking assembly comprises the first oil blocking part with the conical round platform structure, so that the oil blocking effect is improved, the carbon brush is prevented from being interfered, the installation guide of the carbon brush is increased, and the installation of the carbon brush is more convenient; in addition, the material can be greatly saved, and the manufacturing cost is reduced. Through setting up oil retaining assembly and including the second oil retaining part for sheet structure, and the external diameter of second oil retaining part is greater than the external diameter of the second end of first oil retaining part, can effectively prevent the lubricating oil of oiliness bearing from the outside flow direction commutator of first oil retaining part.

Preferably, a groove for storing oil is formed in a contact surface of the first oil blocking component in interference fit with the motor shaft, and the groove is arranged along the circumferential direction of the motor shaft.

In the technical scheme, through on the interference fit's of first fender oil part and motor shaft contact surface, set up the recess that is used for the oil storage in the inboard of first fender oil part promptly, further prevent the bearing oil of oiliness bearing from flowing to the commutator.

Preferably, the outer diameter of the second oil blocking part is larger than the outer diameter of the commutator.

In the technical scheme, the outer diameter of the second oil blocking part is larger than that of the commutator, so that bearing oil of the oil-containing bearing can be blocked from flowing to the commutator from the outside of the second oil blocking part.

Preferably, the axial dimension of the first oil blocking component is more than or equal to 2mm; and/or the dimension of the second oil baffle component along the axial direction is 0.5mm.

In this technical scheme, through setting up first oil retaining part along axial size more than or equal to 2mm, can further strengthen the holistic leakproofness that keeps off the oil subassembly.

Preferably, the end face of the second end of the first oil blocking component and the end face of the oil-containing bearing, which is close to the first oil blocking component, are both planes.

In this technical scheme, because first fender oil part rotates along with the motor shaft, and the oiliness bearing does not rotate along with the motor shaft, through setting up the terminal surface of the second end of first fender oil part with the oiliness bearing is close to the terminal surface of first fender oil part is the plane to avoid when first fender oil part rotates along with the motor shaft, the friction of the terminal surface of both influences the pivoted beneficial technical effect of second fender oil part.

Preferably, the brushed motor further comprises a friction pad, wherein the friction pad is positioned between the oil baffle assembly and the oil-containing bearing.

In this technical scheme, through setting up friction gasket, can play and avoid keeping off oily subassembly and oiliness bearing terminal surface friction effect.

Preferably, the oil blocking component is made of PET.

In the technical scheme, the oil blocking component is made of a PET material with strong toughness, so that the sealing performance of the contact surface of the oil blocking component and a motor shaft is greatly improved, and the beneficial technical effect of blocking bearing oil of an oil-containing bearing from penetrating into a commutator groove is achieved; in addition, the PET does not absorb bearing oil, so that the loss of the bearing oil can be reduced, and the service life of the oil-containing bearing can be prolonged.

An appliance comprising a brushed motor as described above.

The utility model has the positive progress effects that:

According to the utility model, the oil baffle component is made of a ductile material and is arranged on the motor shaft in an interference fit manner, so that the tightness of the contact surface of the oil baffle component and the motor shaft is greatly improved, the effect of preventing bearing oil of the oil-containing bearing from penetrating into the commutator groove is achieved, the commutator groove is kept clean, and carbon powder is not easy to adsorb to form accumulation.

Drawings

Fig. 1 is a schematic partial perspective view of a brush motor according to a preferred embodiment of the present utility model.

Fig. 2 is a schematic partial sectional view of a brush motor according to a preferred embodiment of the present utility model.

Fig. 3 is a partial enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic perspective exploded view of an oil blocking assembly of a brush motor according to a preferred embodiment of the present utility model.

Fig. 5 is a schematic cross-sectional view of a first oil blocking member of a brush motor according to a preferred embodiment of the present utility model.

Description of the reference numerals

Brush motor 1

Motor shaft 10

Commutator 20

Reversing end face 21

Commutator groove 22

Oil-impregnated bearing 30

Oil baffle assembly 40

First oil baffle member 41

First end 411

Second end 412

Groove 413

Second oil baffle member 42

Friction washer 50

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1 to 5, the present embodiment provides a brush motor 1, the brush motor 1 includes a motor shaft 10, a commutator 20 and an oil-containing bearing 30 mounted on the motor shaft 10, the brush motor 1 further includes an oil-blocking component 40, the oil-blocking component 40 is mounted on the motor shaft 10 and rotates coaxially with the motor shaft 10, the oil-blocking component 40 is located between the commutator 20 and the oil-containing bearing 30, and the oil-blocking component 40 is made of a ductile material and is in interference fit with the motor shaft 10.

In this way, the oil baffle assembly 40 is made of a ductile material, that is, the oil baffle assembly 40 has toughness, so that certain rebound can be generated after the oil baffle assembly 40 is installed on the motor shaft 10 in an interference fit manner, no gap or pore exists between the oil baffle assembly 40 and the motor shaft, the sealing performance of the contact surface of the oil baffle assembly 40 and the motor shaft 10 is greatly improved, the bearing oil seeped out during the operation of the oil-containing bearing 30 is prevented from penetrating into the reversing end face 21 of the commutator 20 along the motor shaft 10, and then penetrating into the commutator groove 22 from the reversing end face 21, so that the commutator groove 22 is kept clean, and the beneficial technical effects of difficult carbon powder absorption and accumulation are achieved. With the brush motor 1 of the present embodiment, the effect of blocking the bearing oil is particularly effective when the rotational speed of the motor is at a low rotational speed, so that the bearing oil cannot reach the commutation end face 21 of the commutator 20. The interference of the interference fit of the oil baffle assembly 40 and the motor shaft 10 is about 1 mm.

The oil baffle assembly 40 rotates coaxially with the motor shaft 10, that is, the oil baffle assembly 40 coincides with the axis of the motor shaft 10, and the axial directions P of the two are the same.

Preferably, the oil deflector assembly 40 has an outer diameter greater than the outer diameter of the commutator 20 to deflect the lubricant from the oil deflector assembly 40 to the commutator 20. The dimension of the oil baffle assembly 40 in the axial direction P is 2mm or more to further enhance the sealing property of the oil baffle assembly 40. Preferably, the oil baffle assembly 40 has a dimension in the axial direction P greater than 2mm. Of course, the size of the oil baffle assembly 40 in the axial direction P is limited by the overall size of the brushed motor.

In the present embodiment, the oil blocking assembly 40 includes a first oil blocking member 41 and a second oil blocking member 42 that are attached, and the first oil blocking member 41 and the second oil blocking member 42 are both mounted on the motor shaft 10 and are both in interference fit with the motor shaft 10.

The first oil retaining member 41 has a conical truncated cone structure, the first oil retaining member 41 includes a first end 411 and a second end 412 which are oppositely arranged along the axial direction P, the diameter of the second end 412 is larger than that of the first end 411, the first end 411 faces the oil-containing bearing 30, and the second end 412 faces the commutator 20.

The second oil blocking member 42 has a sheet-like structure, and the second oil blocking member 42 is located between the first oil blocking member 41 and the commutator 20, and the outer diameter of the second oil blocking member 42 is larger than the outer diameter of the second end 412 of the first oil blocking member 41.

Thus, by providing the specific structure of the oil blocking assembly 40, the oil blocking effect of the oil blocking assembly 40 can be greatly improved. Further, by arranging the oil blocking assembly 40 to include the first oil blocking component 41 with a conical truncated cone structure, interference to the carbon brushes and installation guide to the carbon brushes are avoided, and installation with the brushes is facilitated; in addition, the material can be greatly saved, and the manufacturing cost is reduced. By providing the oil deflector assembly 40 including the second oil deflector 42 having a sheet-like structure, and the second oil deflector 42 having an outer diameter larger than that of the second end 412 of the first oil deflector 41, the lubricating oil of the oil-impregnated bearing 30 can be effectively prevented from flowing from the outside of the first oil deflector 41 to the commutator.

Preferably, a groove 413 for oil storage is formed on the contact surface of the first oil blocking component 41 in interference fit with the motor shaft 10, and the groove 413 is arranged along the circumferential direction of the motor shaft 10. In this way, the bearing oil of the oil-impregnated bearing 30 is further prevented from flowing to the commutator by providing the groove 413 for oil storage on the contact surface of the first oil-blocking member 41 with the interference fit of the motor shaft 10, i.e., on the inner side of the first oil-blocking member 41. The radial cross-section of the groove 413 is semicircular, which is beneficial to processing. But is not limited thereto, the cross-sectional shape of the groove 413 in the radial direction may be other shapes such as triangle, rectangle, square, etc.

Preferably, the second oil deflector 42 has an outer diameter greater than the outer diameter of the commutator 20. By providing the second oil blocking member 42 with an outer diameter larger than the outer diameter of the commutator 20 in this way, the bearing oil of the oil-impregnated bearing 30 can be blocked from flowing from the outside of the second oil blocking member 42 to the commutator.

Preferably, the dimension T1 of the first oil deflector 41 in the axial direction P is 2mm or more, and thus, by providing the dimension T1 of the first oil deflector 41 in the axial direction P is 2mm or more, the sealability of the entire oil deflector assembly 40 can be further enhanced. Of course, the dimension T1 of the first oil blocking member 41 in the axial direction P is limited by the overall dimension of the brush motor.

The second oil baffle member 42 has a dimension T2 in the axial direction P of 0.5mm to provide strength to block bearing oil of the oil-impregnated bearing 30 from flowing from the outside of the second oil baffle member 42 to the commutator while not affecting the overall axial dimension of the brushed motor.

In this embodiment, the brushed motor 1 further includes a friction pad 50, the friction pad 50 being located between the oil deflector assembly 40 and the oil bearing 30. In this way, by providing the friction washer 50, the friction between the oil retaining assembly 40 and the end face of the oil-retaining bearing 30 can be avoided, that is, the friction between the first oil retaining member 41 and the end face of the oil-retaining bearing 30 can be avoided. The friction pad 50 is made of graphite and has a thickness of 0.1mm to 0.2mm, and only functions to rub against the end face of the oil-impregnated bearing 30 adjacent to the first oil retaining member 41. The commutator 20, the oil deflector assembly 40, the friction pad 50 and the oil bearing 30 are disposed in close contact with each other in this order.

In other embodiments, the brush motor 1 may not include the friction pad 50, or the end face of the second end 412 of the first oil blocking member 41 may directly abut against the end face of the oil-containing bearing 30 near the first oil blocking member 41, and the end face of the second end 412 of the first oil blocking member 41 and the end face of the oil-containing bearing 30 near the first oil blocking member 41 are both plane surfaces. Thus, since the first oil retaining member 41 rotates along with the motor shaft 10, but the oil-containing bearing 30 does not rotate along with the motor shaft 10, the end face of the second end 412 of the first oil retaining member 41 and the end face of the oil-containing bearing 30, which is close to the first oil retaining member 41, are both planes, so that the beneficial technical effect that the friction of the end faces of the first oil retaining member 41 and the end face of the second oil retaining member 42 affects the rotation of the second oil retaining member 42 when the first oil retaining member 41 rotates along with the motor shaft 10 is avoided. In embodiments that do not include friction pad 50, commutator 20, oil baffle assembly 40, and oil-containing bearing 30 are disposed in close proximity.

However, in the brush motor of the present embodiment including the friction pad 50, both the end face of the second end 412 of the first oil retaining member 41 and the end face of the oil-containing bearing 30 adjacent to the first oil retaining member 41 may be provided as planes. The end face of the second end 412 of the first oil deflector 41 and the end face of the oil-impregnated bearing 30 near the first oil deflector 41 are respectively abutted against the opposite side faces of the friction pad 50.

Specifically, the oil blocking component 40 is made of PET. The English language of PET is all: polyethylene terephthalate, chinese name: polyethylene terephthalate, PET, is one of the tough materials. In this way, the oil baffle assembly 40 is made of a PET material with strong toughness, so that the sealing performance of the contact surface of the oil baffle assembly 40 and the motor shaft 10 is greatly improved, and the beneficial technical effect of preventing the bearing oil of the oil-containing bearing 30 from penetrating into the commutator groove 22 is achieved; in addition, since the PET does not absorb the bearing oil, after the motor stops running, the bearing oil can flow back into the sponge body of the oil-containing bearing 30 for storage, so that the loss of the bearing oil can be reduced, and the service life of the oil-containing bearing 30 can be prolonged. However, in other embodiments, the material of the oil blocking component 40 may be other tough materials.

The present embodiment also provides an electrical appliance comprising a brushed motor 1 as described above. Specifically, the electric appliance can be an electric appliance provided with the brush motor 1 in different manners, such as a range hood, a floor washer, a soymilk machine, a wall breaking machine and the like.

The brush motor 1 and the electrical appliance comprising the same of the embodiment are made of ductile materials by arranging the oil baffle assembly 40, and the oil baffle assembly 40 is mounted on the motor shaft 10 in an interference fit manner, so that the sealing performance of the contact surface of the oil baffle assembly 40 and the motor shaft 10 is greatly improved, and the beneficial technical effect of preventing bearing oil of the oil-containing bearing 30 from penetrating into the commutator groove 22 is achieved.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. The brush motor comprises a motor shaft, a commutator and an oil-containing bearing, wherein the commutator and the oil-containing bearing are arranged on the motor shaft, and the brush motor is characterized by further comprising an oil blocking assembly, the oil blocking assembly is arranged on the motor shaft and coaxially rotates with the motor shaft, the oil blocking assembly is positioned between the commutator and the oil-containing bearing, and the oil blocking assembly is made of a ductile material and in interference fit with the motor shaft.

2. The brushed motor of claim 1 wherein said oil retaining assembly has an outer diameter greater than an outer diameter of said commutator; and/or, the dimension of the oil baffle component along the axial direction is more than or equal to 2mm.

3. The brushed motor of claim 1 wherein said oil retaining assembly comprises a first oil retaining member and a second oil retaining member, said first oil retaining member and said second oil retaining member each mounted on said motor shaft and each having an interference fit with said motor shaft;

The first oil blocking component is of a conical round platform structure, the first oil blocking component comprises a first end and a second end which are oppositely arranged along the axial direction, the diameter of the second end is larger than that of the first end, the first end faces the oil-containing bearing, and the second end faces the commutator;

The second oil blocking component is of a sheet structure, the second oil blocking component is located between the first oil blocking component and the commutator, and the outer diameter of the second oil blocking component is larger than that of the second end of the first oil blocking component.

4. A brushed motor according to claim 3, wherein the first oil retaining member has a recess for oil storage provided in an interference fit contact surface with the motor shaft, the recess being disposed along a circumferential direction of the motor shaft.

5. A brushed motor according to claim 3, wherein the second oil retaining member has an outer diameter greater than the outer diameter of the commutator.

6. A brushed motor according to claim 3, wherein the first oil blocking member has a dimension in the axial direction of 2mm or more; and/or the dimension of the second oil baffle component along the axial direction is 0.5mm.

7. A brushed motor according to claim 3 wherein the end face of the second end of the first oil retaining member and the end face of the oil-containing bearing adjacent the first oil retaining member are planar.

8. The brushed motor of any one of claims 1-7, further comprising a friction pad positioned between the oil baffle assembly and the oil bearing.

9. A brushed motor according to any one of claims 1-7, wherein said oil retaining assembly is PET.

10. An appliance comprising a brushed motor as claimed in any one of claims 1 to 9.