CN215763170U

CN215763170U - Bearing fixing structure and electric tool

Info

Publication number: CN215763170U
Application number: CN202122214361.4U
Authority: CN
Inventors: 高军利; 黄建平
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-02-08
Anticipated expiration: 2031-09-13

Abstract

The utility model discloses a bearing fixing structure and an electric tool. The bearing fixing structure comprises a shell and a gland; wherein a first chamber and a second chamber which are adjacent to each other and communicated with each other are formed inside the shell, the first chamber is configured to be capable of accommodating the bearing, and the inner wall of the second chamber is provided with threads; the gland is screwed in the second cavity, and the inner end surface of the gland can be abutted against the outer end surface of the bearing accommodated in the first cavity so as to limit the bearing in the first cavity. The electric tool is provided with the bearing fixing structure. According to the bearing fixing structure provided by the utility model, the gland and the second cavity adjacent to the first cavity are arranged, and the inner wall of the second cavity is provided with the threads, so that the gland can be screwed into the second cavity, and the gland can be abutted against the bearing, and the axial limitation of the bearing is realized; the bearing fixing structure does not need to be provided with screws, the assembly process is convenient and simple, and the occupied space is small.

Description

Bearing fixing structure and electric tool

Technical Field

The present invention relates to the field of electric tools, and more particularly, to a bearing fixing structure and an electric tool having the same.

Background

Generally, a motor front bearing of an electric tool is installed in a first cavity of a reduction gearbox, a bearing usually presses a bearing outer ring through a screw by using a bearing pressing plate, the assembly process of the structure is complicated, 2-3 screws need to be pressed, the bearing pressing plate needs to cover the bearing outer ring and needs to design a screw installation hole, so that the size of the outer contour of the pressing plate is large, and a lot of internal space is occupied.

Therefore, in view of the above technical problems, it is necessary to provide a new bearing fixing structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bearing fixing structure which does not need to be provided with screws, is simple in assembly process and occupies small space.

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

a bearing fixing structure comprising: a housing and a gland; wherein the housing has formed therein a first chamber and a second chamber adjacent to each other and communicating with each other, the housing having an opening allowing passage of the bearing, the second chamber being closer to the opening than the first chamber, the first chamber being configured to be able to receive the bearing, an inner wall of the second chamber being provided with a thread; the gland is screwed in the second chamber, and the inner end surface of the gland can be abutted against the outer end surface of the bearing accommodated in the first chamber so as to limit the bearing in the first chamber.

In one or more embodiments, an inner end surface of the gland abuts against an outer end surface of an outer ring of the bearing, and the gland is not in contact with an inner ring and a sealing ring of the bearing.

In one or more embodiments, the inner end surface of the gland is formed with a counter bore recessed along the axial direction thereof, and the diameter of the counter bore is greater than or equal to the inner diameter of the outer ring of the bearing, so as to form a space for avoiding the position between the gland and the inner ring and the sealing ring of the bearing.

In one or more embodiments, the inner diameter of the gland is larger than the outer diameter of the inner ring of the bearing, so that the gland can cover the outer side of the sealing ring of the bearing.

In one or more embodiments, the outer end face of the gland is formed with a plurality of assembly holes for mating with an assembly tool.

In one or more embodiments, the diameter of the first chamber is less than the diameter of the second chamber, and the axial length of the first chamber is less than the axial length of the bearing, such that the bearing received in the first chamber can extend partially into the second chamber.

In one or more embodiments, a step portion is formed in the first chamber, and the step portion can abut against an inner end face of the bearing accommodated in the first chamber so as to cooperate with the gland to limit axial displacement of the bearing.

The present invention also provides an electric power tool, including: the bearing, the rotating shaft and the bearing fixing structure are arranged; wherein the bearing is accommodated in the first chamber, and the rotating shaft passes through the gland and is rotatably supported on an inner ring of the bearing.

In one or more embodiments, a first gap is formed between an inner circumferential surface of the gland and an outer circumferential surface of the rotating shaft, and the first gap is used for forming a clearance space between the gland and the rotating shaft.

In one or more embodiments, the electric tool further includes an impeller sleeved on the rotating shaft, the impeller is disposed adjacent to the outer end face of the gland, and a second gap is formed between the impeller and the outer end face of the gland.

Compared with the prior art, the bearing fixing structure provided by the utility model has the advantages that the gland and the second cavity adjacent to the first cavity are arranged, and the inner wall of the second cavity is provided with the threads, so that the gland can be screwed into the second cavity, the gland can be abutted against the bearing, and the axial limitation of the bearing is realized; the bearing fixing structure does not need to be provided with screws, the assembly process is convenient and simple, and the occupied space is small.

Drawings

FIG. 1 is a schematic structural view of a power tool according to an embodiment of the present invention;

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

fig. 3 is a schematic structural view of a housing in the electric power tool shown in fig. 1.

Description of the main reference numerals:

1-bearing, 11-outer ring, 12-inner ring, 13-sealing ring, 2-rotating shaft, 3-shell, 31-first chamber, 32-second chamber, 33-step part, 4-gland, 41-counter bore, 42-assembly hole, 51-first clearance, 52-second clearance and 6-impeller.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 to 3, an electric power tool according to an embodiment of the present invention includes: bearing 1, pivot 2 and bearing fixed knot construct.

In an exemplary embodiment, the bearing fixing structure includes a housing 3 and a gland 4. Wherein the housing 3 internally forms a first chamber 31 and a second chamber 32 adjacent to each other and communicating with each other. The housing 3 has an opening allowing the bearing 1 to pass through, the second chamber 32 being closer to the opening than the first chamber 31. The first chamber 31 is configured to be able to house the bearing 1, and the inner wall of the second chamber 32 is provided with a thread. The gland 4 is screwed into the second chamber 32, and an inner end surface of the gland 4 can abut against an outer end surface of the bearing 1 accommodated in the first chamber 31 to confine the bearing 1 in the first chamber 31.

In an exemplary embodiment, the bearing 1 includes an outer race 11, an inner race 12, and a seal ring 13 positioned between the outer race 11 and the inner race 12. The bearing 1 is accommodated in the first chamber 31, and the rotating shaft 2 passes through the gland 4 and is rotatably supported on the inner ring 12 of the bearing 1.

The first chamber 31 is used as a containing cavity of the bearing 1, and is provided with a cylindrical containing space which is approximately consistent with the outer contour of the bearing 1, so that the outer peripheral surface of the bearing 1 contained in the first chamber 31 can be tightly attached to the inner wall of the first chamber 31, and the radial displacement of the bearing 1 is limited.

In an exemplary embodiment, the inner end surface of the gland 4 abuts against the outer end surface of the outer ring 11 of the bearing 1, and the gland 4 is not in contact with the inner ring 12 and the sealing ring 13 of the bearing 1. The inner end surface of the gland 4 is formed with a counter bore 41 recessed along the axial direction thereof, and the diameter of the counter bore 41 is larger than or equal to the inner diameter of the outer ring 11 of the bearing 1, so as to form a space between the gland 4 and the inner ring 12 and the sealing ring 13 of the bearing 1. The space can avoid friction between the inner ring 12 of the bearing 1 and the sealing ring 13 when rotating, so that abrasion between the gland 4 and the bearing 1 is reduced, and the bearing 1 is ensured to rotate smoothly.

In an exemplary embodiment, the inner diameter of the gland 4 is larger than the outer diameter of the inner ring 12 of the bearing 1, so that the gland 4 can cover the outer side of the sealing ring 13 of the bearing 1, thereby playing a role of blocking dust, preventing dust from entering a slideway of the bearing 1 to damage lubricating oil of the bearing 1, reducing the abrasion of the bearing 1 and prolonging the service life.

In an exemplary embodiment, the inner circumferential surface of the second chamber 32 of the housing 3 is formed with an internal thread, and the outer circumferential surface of the cover 4 is formed with an external thread matching the internal thread of the second chamber 32. The outer end face of the gland 4 is formed with a plurality of assembly holes 42 for engagement with an assembly tool. Through which the fitting hole 42 can be fitted with a fitting tool such as a wrench so as to screw the gland 4 into the second chamber 32 of the housing 3.

In an exemplary embodiment, the diameter of the first chamber 31 is smaller than the diameter of the second chamber 32, and the axial length of the first chamber 31 is smaller than the axial length of the bearing 1, so that the bearing 1 received in the first chamber 31 can partially extend into the second chamber 32, so that the gland 4 screwed into the second chamber 32 abuts against the bearing 1.

In an exemplary embodiment, the first chamber 31 has a step 33 formed therein, and the step 33 can abut against the inner end surface of the bearing 1 to cooperate with the gland 4 to define the axial displacement of the bearing 1. The inner diameter of the step portion 33 is configured to be smaller than the outer diameter of the outer ring 11 of the bearing 1 and larger than the inner diameter of the outer ring 11 of the bearing 1, so that the step portion 33 only abuts against the inner end surface of the outer ring 11 of the bearing 1, thereby avoiding the step portion 33 from contacting with the inner ring 12 of the bearing 1 and the seal ring 13.

In an exemplary embodiment, a first gap 51 is formed between the inner circumferential surface of the gland 4 and the outer circumferential surface of the rotating shaft 2, and the first gap 51 is used to form a space between the gland 4 and the rotating shaft 2 to prevent the gland 4 from contacting the rotating shaft 2, thereby ensuring smooth rotation of the rotating shaft 2.

In an exemplary embodiment, the power tool further includes an impeller 6 sleeved on the rotating shaft 2, the impeller 6 is disposed adjacent to the outer end surface of the gland 4, and a second gap 52 is formed between the outer end surface of the impeller 6 and the gland 4. The second clearance 52 prevents the impeller 6 from contacting the gland 4, thereby ensuring smooth rotation of the impeller 6.

In summary, in the bearing fixing structure provided by the present invention, the gland 4 and the second chamber 32 adjacent to the first chamber 31 are arranged, and the inner wall of the second chamber 32 is provided with the screw thread, so that the gland 4 can be screwed into the second chamber 32, and the gland 4 can be abutted against the bearing 1, so as to axially limit the bearing 1; the bearing fixing structure does not need to be provided with screws, the assembly process is convenient and simple, and the occupied space is small.

The foregoing descriptions of specific exemplary embodiments of the present invention have been 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 certain principles of the utility model and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the utility model and various alternatives and 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

1. A bearing fixing structure, comprising:

a housing (3) inside which a first chamber (31) and a second chamber (32) are formed, adjacent to each other and communicating with each other, the housing (3) having an opening allowing the passage of the bearing (1), the second chamber (32) being closer to the opening with respect to the first chamber (31), wherein the first chamber (31) is configured to be able to house the bearing (1), the inner wall of the second chamber (32) being provided with a thread;

a gland (4) screwed into the second chamber (32) and having an inner end face capable of bearing against an outer end face of a bearing (1) received in the first chamber (31) to confine the bearing (1) in the first chamber (31).

2. The bearing fixing structure according to claim 1, wherein the inner end surface of the gland (4) abuts against the outer end surface of the outer ring (11) of the bearing (1), and the gland (4) is not in contact with the inner ring (12) and the seal ring (13) of the bearing (1).

3. The bearing fixing structure according to claim 2, wherein the inner end surface of the gland (4) is formed with a counter bore (41) recessed along the axial direction thereof, and the diameter of the counter bore (41) is greater than or equal to the inner diameter of the outer ring (11) of the bearing (1) so as to form a clearance space between the gland (4) and the inner ring (12) and the sealing ring (13) of the bearing (1).

4. The bearing fixing structure according to claim 2, wherein the inner diameter of the gland (4) is larger than the outer diameter of the inner race (12) of the bearing (1) so that the gland (4) can cover the outside of the seal ring (13) of the bearing (1).

5. The bearing fixing structure according to claim 1, wherein the gland (4) is formed at an outer end surface thereof with a plurality of fitting holes (42) for fitting with a fitting tool.

6. Bearing fixation structure as claimed in claim 1, characterized in that the diameter of the first chamber (31) is smaller than the diameter of the second chamber (32) and the axial length of the first chamber (31) is smaller than the axial length of the bearing (1), so that the bearing (1) received in the first chamber (31) can extend partly into the second chamber (32).

7. Bearing fixation according to claim 1, characterized in that a step (33) is formed in the first chamber (31), said step (33) being adapted to abut against an inner end surface of the bearing (1) received in the first chamber (31) to cooperate with the gland (4) to define an axial displacement of the bearing (1).

8. An electric power tool, characterized by comprising: a bearing (1), a rotating shaft (2) and a bearing fixing structure according to any one of claims 1 to 7;

wherein the bearing (1) is accommodated in the first chamber (31), and the rotating shaft (2) passes through the gland (4) and is rotatably supported on an inner ring (12) of the bearing (1).

9. The electric tool according to claim 8, wherein a first gap (51) is formed between an inner circumferential surface of the gland (4) and an outer circumferential surface of the spindle (2), and the first gap (51) is used to form a space between the gland (4) and the spindle (2).

10. The power tool according to claim 8, further comprising an impeller (6) sleeved on the rotating shaft (2), wherein the impeller (6) is arranged adjacent to the outer end face of the gland (4), and a second gap (52) is formed between the impeller (6) and the outer end face of the gland (4).