CN219197926U - Dustproof mechanism and electric tool - Google Patents

Abstract

The utility model discloses a dustproof mechanism and an electric tool, wherein the dustproof mechanism comprises: the bearing comprises a bearing inner ring and a bearing outer ring; a safety check ring arranged between the commutator of the electric tool and the bearing; and the dust ring is arranged between the safety check ring and the bearing, at least part of the dust ring is abutted against the end face of the bearing inner ring, and when the bearing is in a normal working state, the outer diameter of the dust ring is smaller than the inner diameter of the bearing outer ring. The dustproof ring in the dustproof mechanism can prevent dust from entering the bearing in the axial direction of the bearing, thereby playing a dustproof role on the bearing.

Description

Dustproof mechanism and electric tool

Technical Field

The present utility model relates to the field of power tools, and more particularly, to a dust-proof mechanism and a power tool.

Background

The existing safety check ring generally has no dustproof effect, only increases the gap and creepage distance of an electric appliance, and enables the safety distance to be larger than 8 mm.

The safety check ring only plays a role in increasing safety, but cannot play a role in preventing dust of the bearing at the rear end of the armature, and the bearing can be quickly failed once ash or other impurities such as iron powder enter the bearing slide way. Because the bearing at the rear end of the armature is positioned near the air inlet of the tool, all impurities such as dust and the like easily enter the bearing slideway to play, and the bearing is damaged.

Disclosure of Invention

The utility model aims to provide a dustproof mechanism which can improve the dustproof effect of a bearing and prolong the service life of the bearing.

The utility model also aims to provide a power tool.

In order to achieve the above object, the present utility model provides a dust-proof mechanism adapted for a power tool, comprising:

the bearing comprises a bearing inner ring and a bearing outer ring;

a safety check ring arranged between the commutator of the electric tool and the bearing;

and the dust ring is arranged between the safety check ring and the bearing, at least part of the dust ring is abutted against the end face of the bearing inner ring, and when the bearing is in a normal working state, the outer diameter of the dust ring is smaller than the inner diameter of the bearing outer ring.

In one or more embodiments, the bearing further includes a dust guard between the bearing inner ring and the bearing outer ring, the bearing inner ring having a gap between an outer wall thereof in a radial direction and the dust guard, the dust guard covering the gap in an axial direction of the bearing.

In one or more embodiments, the dust ring has an outer diameter that is greater than an outer diameter of the bearing inner race.

In one or more embodiments, the dust-proof mechanism further comprises a bearing chamber, the bearing is installed in the bearing chamber, the bearing chamber is provided with a convex rib, one side of the safety retainer, which faces the bearing, is convexly provided with an annular retaining rib, and a labyrinth structure is defined among the safety retainer, the annular retaining rib and the convex rib.

In one or more embodiments, the dust-proof mechanism further includes a bearing housing, which is sleeved outside the bearing outer ring and is disposed in the bearing chamber.

In one or more embodiments, the bearing housing, annular rib, and safety collar define a labyrinth structure.

In one or more embodiments, the safety ring is provided with a blade protruding from the side facing away from the bearing.

In one or more embodiments, the safety collar and the dust collar are of unitary construction.

The present utility model provides an electric tool comprising:

a housing having an accommodating space therein;

the armature comprises an armature shaft and a commutator sleeved on the armature shaft;

the dustproof mechanism is arranged in the accommodating space and sleeved on the armature shaft.

In one or more embodiments, the armature shaft includes a shaft portion and a head portion connected along an axial direction thereof with an abutment surface therebetween, the safety ring includes an abutment portion provided between the abutment surface and a bearing, and a sum of thicknesses of the abutment portion and a dust ring is smaller than a space between the abutment surface and the bearing along the axial direction of the armature shaft.

Compared with the prior art, according to the dustproof mechanism, the dustproof ring is added between the safety check ring and the bearing, so that dust can be prevented from entering the bearing in the axial direction of the bearing, and the bearing is dustproof.

Drawings

FIG. 1 is a partial cross-sectional view of a power tool according to one embodiment of the present utility model;

FIG. 2 is an enlarged view at A in FIG. 1;

fig. 3 is a cross-sectional view of a safety collar and dust collar according to an embodiment of the present utility model.

FIG. 4 is a schematic view of a safety collar according to one embodiment of the present utility model;

FIG. 5 is a schematic view of a safety collar according to one embodiment of the present utility model;

fig. 6 is a partial cross-sectional view of a power tool according to another embodiment of the present utility model.

The main reference numerals illustrate:

1. a housing; 11. an accommodation space; 2. an armature; 21. an armature shaft; 211. a shaft portion; 212. a head; 213. an abutment surface; 22. a commutator; 3. a bearing; 31. a bearing inner ring; 32. a bearing outer ring; 33. a dust-proof member; 34. a gap; 4. a safety check ring; 41. a body portion; 42. a protruding portion; 43. a blade; 44. annular blocking ribs; 45. a pressing part; 5. a bearing chamber; 51. a housing; 52. an installation space; 53. convex ribs; 6. a dust ring; 7. and a bearing sleeve.

Detailed Description

The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

As shown in fig. 1 to 3, the electric power tool according to an embodiment of the present utility model includes a housing 1 having a housing space 11, and an armature 2 and a dust-proof mechanism mounted in the housing space 11. The armature 2 comprises an armature shaft 21 and a commutator 22 sleeved on the armature shaft 21; the dustproof mechanism comprises a bearing 3, a safety check ring 4 and a dustproof ring 6; the bearing 3 includes a bearing inner ring 31 and a bearing outer ring 32; the safety ring 4 is arranged between the commutator 22 and the bearing 3; the dust ring 6 is arranged between the safety ring 4 and the bearing 3, and at least part of the dust ring 6 is abutted against the end face of the bearing inner ring 31, when the bearing 3 is in a normal working state, the outer diameter of the dust ring 6 is smaller than the inner diameter of the bearing outer ring 32.

In the dust-proof mechanism of the present utility model, the space between the bearing inner ring 31 and the bearing outer ring 32 is covered as much as possible in the axial direction of the bearing 3 by adding the dust-proof ring 6 between the safety ring 4 and the bearing 3, and the dust-proof member 33 can play a dust-proof role on the bearing 3 in the axial direction of the bearing 3. It will be appreciated that the bearing 3 is in a normal operating condition and can be considered as the bearing 3 being sleeved on the armature shaft 21; the outer diameter of the dust ring 6 is smaller than the inner diameter of the bearing outer ring 32, so that abrasion of the dust ring 6 and the bearing outer ring 3 caused by the contact of the dust ring 6 with the bearing outer ring 32 when the dust ring 6 rotates following the armature shaft 21 is prevented. Of course, the outer diameter of the dust ring 6 may be equal to or larger than the inner diameter of the bearing outer ring 32, and at this time, the bearing 3 is abnormally operated due to the relative rotation of the bearing inner ring 31 and the bearing outer ring 32 until the dust ring 6 is worn into the above-mentioned shape, that is, the outer diameter of the dust ring 6 is smaller than the inner diameter of the bearing outer ring 32, and the bearing 3 is in a normal operating state.

Wherein the thickness of the dust ring 6 may be 0.2-0.4mm in the axial direction of the armature shaft 21. The bearing outer ring 32 is connected with the dust-proof piece 33 in a clamping way along the inner wall in the radial direction, and the dust-proof piece 33 is fixedly connected with the bearing outer ring 32.

In one embodiment, the bearing 3 further includes a dust-proof member 33 disposed between the bearing inner ring 31 and the outer side of the bearing outer ring 32, and a gap 34 is provided between the outer wall of the bearing inner ring 31 in the radial direction thereof and the dust-proof member 33. The dust ring 6 covers the gap 34 in the axial direction of the bearing 3.

Specifically, the bearing 1 further includes balls movably connected between the bearing inner ring 31 and the bearing outer ring 32; along the axial direction of the bearing 1, two sides of the ball are respectively provided with a dustproof piece 33, and the bearing inner ring 31, the bearing outer ring 32 and the two dustproof pieces 33 enclose a relatively airtight space, so that dust can be reduced as far as possible to enter the space, and the service life of the bearing is prolonged.

It will be appreciated that the gap 34 communicates with the space as described above due to the relative rotation required between the bearing inner race 31 and the bearing outer race 32. One end of the dust-proof member 33 is inserted into the bearing outer ring 32, and the other end is rotatable relative to the bearing inner ring 31, so that a gap 34 exists between the dust-proof member 33 and the bearing inner ring 31.

As shown in fig. 2, in a specific embodiment, the outer diameter of the dust ring 6 may be smaller than the outer diameter of the bearing inner ring 31, so long as the dust ring 6 can cover the gap 34 in the axial direction of the bearing 3 with the dust ring 6.

In other embodiments, one end of the dust-proof member 33 may be inserted into the bearing inner ring 31, and then the other end of the dust-proof member 33 and the bearing outer ring 31 may rotate relatively, so that a gap 34 exists between the dust-proof member 33 and the bearing outer ring 31, i.e., the gap 34 may be formed by the dust-proof member 33 and the bearing outer ring 31; at this time, the dust ring 6 may be adjusted to cover the gap 34.

Along the axial direction of the armature shaft 21, the thicknesses of the safety check ring 4 and the dust ring 6 and the electric gap 34 and the creepage distance between the copper sheets on the commutator 22 and the bearing 3 can be more than 8mm, thereby meeting the requirement of the safety distance.

In another embodiment, as shown in fig. 6, the outer diameter of the dust ring 6 may be larger than the outer diameter of the bearing inner ring 31, and the outer diameter of the dust ring 6 is smaller than the inner diameter of the bearing outer ring 32. By this arrangement, the dust ring 6 can be made to cover the gap 34 between the bearing inner ring 31 and the dust piece 33 in the axial direction of the bearing 3 better.

As shown in fig. 3, the retainer ring 4 may include a body portion 41 and a protruding portion 42 protruding from one surface of the body portion 41. The side of the safety ring 4 facing the commutator 22 is a body 41, and the side facing the bearing 3 is a projection 42.

In a specific embodiment, the dustproof mechanism further comprises a bearing chamber 5, the bearing 3 is installed in the bearing chamber 5, the bearing chamber 5 is provided with a convex rib 53, one side, facing the bearing 3, of the safety check ring 4 is convexly provided with an annular blocking rib 44, and a labyrinth structure is defined among the safety check ring 4, the annular blocking rib 44 and the convex rib 53. The labyrinth structure may be considered as a labyrinth-shaped space defined among the body portion 41, the annular rib 44, and the bead 53 of the retainer ring 4, and may have an increased dust-proof effect.

It will be appreciated that the bearing housing 5 may be considered to comprise the housing 51 and the mounting space 52 formed by the housing 51, the bearing 3 being mounted in the bearing housing 5, i.e. the bearing 3 may be considered to be located in the mounting space 52. The housing 51 may be fixedly connected to the housing 1 (i.e., the housing 1 and the housing 51 are two separate components), and the housing 51 may be integrally formed with the housing 1 (i.e., the housing 51 is a part of the housing 1).

Specifically, the dustproof mechanism further comprises a bearing sleeve 7, and the bearing sleeve 7 is sleeved outside the bearing outer ring 32 and is arranged in the bearing chamber 5. The bearing housing 7 serves to protect the bearing outer race 32.

Specifically, the bearing housing 7, the annular rib 44 and the safety ring 4 define a labyrinth structure. The labyrinth structure can be considered as a labyrinth space defined by the end of the bearing housing 7, the annular rib 44 and the body portion 41 of the safety ring 4. The two labyrinth structures are matched to form a double labyrinth structure, so that the dustproof performance of the dustproof mechanism is improved.

Specifically, the bearing sleeve 7 is in interference fit with the bearing chamber 5, and the bearing sleeve 7 is in interference fit with the bearing outer ring 32; such an arrangement may serve to secure the bearing outer race 32.

In a particular embodiment, the safety ring 4 is provided with a blade 43 protruding from the side facing away from the bearing 3. Specifically, the blades 43 are centrifugal blades, and when the safety ring 4 rotates along with the armature shaft 21, the blades 43 rotate along with the rotation of the safety ring, so that dust is blown away in the radial direction by wind formed by rotation of the blades 43, and a dustproof effect is achieved.

In particular, the blades 43 may be distributed in a circumferential array on the side of the safety ring 4 facing away from the bearing 3, centered on the axis of the safety ring 4. For example, in fig. 5, six blades 43 may be distributed in a circumferential array on the side of the safety ring 4 facing away from the bearing 3.

As shown in fig. 5, in particular, the height of the vane 43 gradually increases outward from the axis of the safety ring 4, wherein the height of the vane 43 can be regarded as the thickness of the vane 43 in the axial direction of the safety ring 4.

In a specific embodiment, the armature shaft 21 includes a shaft portion 211 and a head portion 212 connected in the axial direction thereof, an abutment surface 213 is provided between the shaft portion 211 and the head portion 212, the safety ring 4 includes an abutment portion 45 provided between the abutment surface 213 and the bearing 3, and the thickness sum of the abutment portion 45 and the dust ring 6 is smaller than the interval between the abutment surface 213 and the bearing 3 in the axial direction of the armature shaft 21 so that the abutment portion 45 and/or the dust ring 6 are in a compressed state. Wherein, the pressing portion 45 is connected with the protruding portion 42.

It should be noted that, the pressing portion 45 and/or the dust ring 6 in the compressed state may reduce the distance between the protruding portion 42 and the bearing 3, and reduce the probability that dust enters the bearing 3 through the gap between the protruding portion 42 and the bearing 3, thereby playing a role in dust prevention.

Specifically, the dust ring 6 and the safety ring 4 may be made of rubber, so that the dust ring 6 and the safety ring 4 have elasticity.

In any of the above embodiments, the safety ring 4 and the dust ring 6 are two separate components. As shown in fig. 4, in other embodiments, the safety ring 4 and the dust ring 6 are integrally formed, that is, the dust ring 6 may be a part of the safety ring 4, and in this case, the height of the dust ring 6 may be 0.1mm to 0.3mm, and the height of the dust ring 6 may be regarded as the thickness of the dust ring 6 in the axial direction of the safety ring 4.

The dustproof mechanism provided by the utility model has quadruple dustproof measures:

the dust ring can prevent dust from entering the bearing in the axial direction of the bearing, so that the bearing has a dust-proof effect.

Secondly, through setting up dust guard 33 on bearing 3, block that the dust gets into in the bearing 3 to play dirt-proof effect to bearing 3. The dust ring 6 can cover the gap 34 between the dust piece 33 and the bearing inner ring 31 in the axial direction of the bearing 3, and the dust piece 3 and the dust ring 6 are matched with each other to play a role in dust prevention.

Thirdly, through being equipped with blade 43 on the one side that deviates from bearing 3 on the safety ring 4, blade 43 rotates along with safety ring 4, and the wind that produces blows away the dust along radial, can prevent that the dust from getting into in the bearing 3.

And fourthly, a double labyrinth structure is formed by the mutual matching of the safety check ring 4, the bearing chamber 5 and the bearing sleeve 7, so that the probability of dust entering the bearing 3 is reduced.

Under the quadruple dustproof effect, the service life of the bearing 3 is greatly prolonged, and the dustproof endurance time of the safety check ring 4 is obviously improved through the comparison test of a dust box.

In summary, the dust-proof mechanism of the present utility model has an excellent dust-proof effect.

The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.

Claims (10)

1. A dust-proof mechanism adapted for use with a power tool, comprising:

a bearing (3) comprising a bearing inner ring (31) and a bearing outer ring (32);

a safety ring (4) arranged between the commutator (22) of the electric tool and the bearing (3);

and the dustproof ring (6) is arranged between the safety check ring (4) and the bearing (3), at least part of the dustproof ring (6) is abutted against the end face of the bearing inner ring (31), and when the bearing (3) is in a normal working state, the outer diameter of the dustproof ring (6) is smaller than the inner diameter of the bearing outer ring (32).

2. A dust prevention mechanism as claimed in claim 1, characterized in that the bearing (3) further comprises a dust prevention member (33) located between the bearing inner ring (31) and the bearing outer ring (32), the bearing inner ring (31) having a gap (34) between an outer wall thereof in a radial direction and the dust prevention member (33), the dust prevention ring (6) covering the gap (34) in an axial direction of the bearing (3).

3. A dust protection mechanism according to claim 1 or 2, characterized in that the dust protection ring (6) has an outer diameter which is larger than the outer diameter of the bearing inner ring (31).

4. The dustproof mechanism of claim 1, further comprising a bearing chamber (5), wherein the bearing (3) is installed in the bearing chamber (5), a convex rib (53) is arranged on the bearing chamber (5), an annular blocking rib (44) is arranged on one side, facing the bearing (3), of the safety ring (4), and a labyrinth structure is defined among the safety ring (4), the annular blocking rib (44) and the convex rib (53).

5. The dustproof mechanism of claim 4, further comprising a bearing housing (7), wherein the bearing housing (7) is sleeved outside the bearing outer ring (32) and is arranged in the bearing chamber (5).

6. A dust protection mechanism according to claim 5, characterized in that the bearing housing (7), the annular rib (44) and the safety ring (4) define a labyrinth structure.

7. A dust control mechanism according to claim 1, characterised in that the safety ring (4) is provided with a protruding blade (43) on the side facing away from the bearing (3).

8. A dust protection mechanism according to claim 1, characterized in that the safety ring (4) and the dust protection ring (6) are of one-piece construction.

9. A power tool, comprising:

a housing (1) having an accommodation space (11) therein;

an armature (2) comprising an armature shaft (21) and a commutator (22) sleeved on the armature shaft (21);

the dust-proof mechanism according to any one of claims 1 to 8, which is mounted in the housing space (11) and is fitted over the armature shaft (21).

10. The electric tool according to claim 9, wherein the armature shaft (21) includes a shaft portion (211) and a head portion (212) connected in an axial direction thereof, an abutment surface (213) is provided between the shaft portion (211) and the head portion (212), the safety ring (4) includes an abutment portion (45) provided between the abutment surface (213) and the bearing (3), and a thickness of the abutment portion (45) and the dust ring (6) in the axial direction of the armature shaft (21) and a distance between the abutment surface (213) and the bearing (3) are smaller.

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