CN112615460A - Sealing structure and servo motor with same - Google Patents
Sealing structure and servo motor with same Download PDFInfo
- Publication number
- CN112615460A CN112615460A CN202011548700.6A CN202011548700A CN112615460A CN 112615460 A CN112615460 A CN 112615460A CN 202011548700 A CN202011548700 A CN 202011548700A CN 112615460 A CN112615460 A CN 112615460A
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- Prior art keywords
- teeth
- sealing
- flange
- rear end
- axial
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- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 65
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 239000012535 impurity Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Motor Or Generator Frames (AREA)
Abstract
本发明提供了一种密封结构及具有其的伺服电机，涉及电机技术领域，解决了机械摩擦制动产生的铁粉等杂质易从伺服电机的后端盖和电机轴之间的间隙进入编码器的技术问题。该密封结构包括后端盖和法兰，法兰设置于制动器和编码器之间，且后端盖和/或法兰上设置有密封齿，密封齿将制动器和编码器之间的流通通道封闭，杜绝了铁粉等杂质从伺服电机的后端盖与电机轴之间的间隙通道进入编码器内，保证了编码器的可靠定位和伺服电机的正常运转。
The invention provides a sealing structure and a servo motor having the same, relates to the technical field of motors, and solves the problem that impurities such as iron powder generated by mechanical friction braking easily enter the encoder from the gap between the rear end cover of the servo motor and the motor shaft technical issues. The sealing structure includes a rear end cover and a flange, the flange is arranged between the brake and the encoder, and sealing teeth are arranged on the rear end cover and/or the flange, and the sealing teeth close the flow passage between the brake and the encoder , to prevent impurities such as iron powder from entering the encoder from the gap channel between the rear end cover of the servo motor and the motor shaft, ensuring the reliable positioning of the encoder and the normal operation of the servo motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a sealing structure and a servo motor with the same.
Background
The servo motor is an electromagnetic device which performs mutual conversion between mechanical energy and electric energy by taking a magnetic field as a medium, and is widely applied to various fields such as industrial robots, numerical control machines and the like at present. As shown in fig. 1, the servo motor generally comprises a front end cover 1, a main bearing 2, a stator 3, a rotor 4, a secondary bearing 5, a middle end cover 6, a brake 7, a rear end cover 10, an encoder 11, an encoder cover 12, a motor shaft 13, and the like. The servo motor brake 7 has the function of emergency braking under the condition that the motor is suddenly powered off when working, so that mechanical parts driven by the motor can be quickly stopped to prevent danger. The working principle of the brake 7 is that when the brake is electrified, a coil of the brake generates a magnetic field, and an armature 8 of the brake is attracted to separate the armature from a friction plate 9 of the brake; when the power is suddenly cut off, the magnetic field disappears, the brake armature 8 is released, and the armature and the brake friction plate 9 are instantly contacted to generate huge friction force so as to enable the motor to stop rotating rapidly.
The applicant has found that the prior art has at least the following technical problems:
the braking mode adopts mechanical friction braking, but due to mechanical friction, after emergency braking, a large amount of iron powder can fall off from the friction plate, and when the robot moves, the large amount of iron powder can enter the encoder 11 along a gap between the rear end cover 10 and the motor shaft 13, so that the positioning of the encoder is influenced, and the motor cannot normally run.
Disclosure of Invention
The invention aims to provide a sealing structure and a servo motor with the same, and aims to solve the technical problem that impurities such as iron powder and the like generated by mechanical friction braking easily enter an encoder from a gap between a rear end cover and a motor shaft of the servo motor in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a sealing structure which comprises a rear end cover and a flange, wherein the flange is arranged between a brake and an encoder, and sealing teeth are arranged on the rear end cover and/or the flange.
Optionally, the sealing teeth are provided to the flange.
Optionally, the seal teeth include first axial teeth and first radial teeth, a plurality of the first axial teeth being capable of sealing in an axial direction of the motor shaft, and a plurality of the first radial teeth being capable of sealing in a radial direction of the motor shaft.
Optionally, a plurality of the first axial teeth are disposed on the outer circumferential surface of the flange, and a plurality of the first radial teeth are disposed on the end surface of the flange close to the rear end cover.
Optionally, each first axial tooth has a triangular cross section, and each first radial tooth has an isosceles trapezoid cross section.
Optionally, the seal teeth are provided to the rear end cap.
Optionally, the seal teeth include a second axial tooth and a second radial tooth, a plurality of the second axial teeth being capable of sealing in an axial direction of the motor shaft, and a plurality of the second radial teeth being capable of sealing in a radial direction of the motor shaft.
Optionally, a plurality of the second axial teeth are disposed on an inner circumferential surface of the rear end cover, and a plurality of the second radial teeth are disposed on an end surface of the rear end cover close to the flange.
Optionally, each of the second axial teeth has a triangular cross section, and each of the second radial teeth has an isosceles trapezoid cross section.
Optionally, the inner diameter of the flange is adapted to the outer diameter of the motor shaft.
Optionally, the inner diameter of the flange is a, the outer diameter of the flange is B, and B ═ 2-3 a.
The invention provides a servo motor which comprises the sealing structure.
The sealing structure comprises a rear end cover and a flange, the flange is arranged between a brake and an encoder, and sealing teeth are arranged on the rear end cover and/or the flange and seal a circulation channel between the brake and the encoder, so that impurities such as iron powder and the like are prevented from entering the encoder from a gap channel between the rear end cover of the servo motor and a motor shaft, and the reliable positioning of the encoder and the normal operation of the servo motor are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a servo motor according to the prior art, in which arrows indicate the flow direction of iron powder;
FIG. 2 is a schematic cross-sectional view of a servo motor having a first sealing structure according to an embodiment of the present invention;
FIG. 3 is a partially enlarged schematic view of portion I of FIG. 2;
FIG. 4 is a schematic cross-sectional view of a servo motor with a second sealing structure according to an embodiment of the present invention;
fig. 5 is a partially enlarged structural view of a portion J in fig. 4.
Fig. 1, front end cap; 2. a main bearing; 3. a stator; 4. a rotor; 5. a secondary bearing; 6. a middle end cover; 7. a brake; 8. a brake armature; 9. a brake friction plate; 10. a rear end cap; 101. a second radial tooth; 102. a second axial tooth; 11. an encoder; 12. an encoder cover; 13. a motor shaft; 14. a flow-through channel; 15. a hub and a baffle of the brake; 16. a flange; 161. a first radial tooth; 162. a first axial tooth.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In one aspect, the present invention provides a sealing structure, which includes a rear end cap 10 and a flange 16, wherein the flange 16 is disposed between the brake 7 and the encoder 11, and sealing teeth are disposed on the rear end cap 10 and/or the flange 16.
The rear end cover 10 and/or the flange 16 are/is provided with sealing teeth, the sealing teeth seal a circulation channel 14 between the brake 7 and the encoder 11, impurities such as iron powder and the like are prevented from entering the encoder 11 from a gap channel between the rear end cover 10 and the motor shaft 13 of the servo motor, and the reliable positioning of the encoder 11 and the normal operation of the servo motor are guaranteed.
In another aspect, the present invention provides a servo motor including any one of the above sealing structures. Servo motor has increased a flange 16 between stopper 7 and encoder 11, and flange 16 passes through interference fit to be fixed on motor shaft 13, and sealed tooth can prevent that the iron powder from getting into encoder 11, reduces the risk of motor trouble, is favorable to servo motor long-term operation's reliability. The sealing structure has the advantages of simple structure, easy realization and low cost, and can not influence the overall structure, performance and reliability of the existing motor.
As an alternative embodiment, as shown in fig. 2 and 3, the sealing teeth of the sealing structure of the servo motor are provided to the flange 16.
As an alternative embodiment, the seal teeth include a first axial tooth 162 and a first radial tooth 161, the plurality of first axial teeth 162 can achieve sealing in the axial direction of the motor shaft 13, the plurality of first radial teeth 161 can achieve sealing in the radial direction of the motor shaft 13, and blocking the flow passage 14 in the axial and radial directions ensures that impurities such as iron powder do not enter the encoder 11, thereby improving sealing reliability.
In an alternative embodiment, a plurality of first axial teeth 162 are disposed on the outer circumferential surface of the flange 16, and a plurality of first radial teeth 161 are disposed on the end surface of the flange 16 near the rear end cover 10. The plurality of first axial teeth 162 increases axial seal reliability and the plurality of first radial teeth 161 increases radial seal reliability.
As an alternative embodiment, each first axial tooth 162 has a triangular cross section and each first radial tooth 161 has an isosceles trapezoid cross section. The axial sealing teeth are designed into triangular shapes, so that dust is less prone to entering, and the sealing effect is better; the radial seal tooth design is trapezoidal for easier machining and installation.
As an alternative embodiment, the inner diameter of the flange 16 is adapted to the outer diameter of the motor shaft 13, and the inner diameter of the flange 16
Can change along with the size of motor shaft 13 shaft diameter, the commonality is strong.
In an alternative embodiment, the inner diameter of the flange 16 is a, the outer diameter of the flange 16 is B, and B is (2-3) a. I.e. the outer diameter of the sealing flange 16
Is the inner diameter
2-3 times of the total weight of the product is optimal.
As shown in fig. 3, the cylindrical flange 16 is provided with sealing teeth along the axial direction and the radial direction, the radial sealing teeth are isosceles trapezoids for primary sealing, and at least three sealing teeth are required to be arranged. Wherein alpha 3 is designed to be 115-125 degrees, the tooth crest width d2 is 0.4-1 mm, the tooth space d3 is 0.5-1.2 mm, the tooth depth h4 is 0.4-2 mm, and the distance h3 between the tooth crest and the rear end cover 10 is 0.5-1 mm; the axial sealing teeth are triangular and used for secondary sealing, at least three sealing teeth also need to be arranged, wherein alpha 1 is designed to be 120-130 degrees, alpha 2 is designed to be 65-75 degrees, the tooth space d1 is 0.3-1 mm, the tooth depth h2 is 1-1.5 mm, the distance h1 between the tooth top and the rear end cover 10 is 0.3-0.5 mm, and iron powder is effectively prevented from entering the encoder 11 through the blocking effect of the axial and radial two-stage sealing teeth.
Fig. 4 and 5 show, as an alternative embodiment, a schematic view of a second sealing structure according to the invention, which differs from the first sealing structure in that the sealing teeth of the second sealing structure are provided on the rear end cap 10.
As an alternative embodiment, the seal teeth include a second axial tooth 102 and a second radial tooth 101, the plurality of second axial teeth 102 being capable of achieving sealing in the axial direction of the motor shaft 13, and the plurality of second radial teeth 101 being capable of achieving sealing in the radial direction of the motor shaft 13.
In an alternative embodiment, a plurality of second axial teeth 102 are disposed on the inner circumferential surface of the rear end cap 10, and a plurality of second radial teeth 101 are disposed on the end surface of the rear end cap 10 near the flange 16. The plurality of second axial teeth 102 increases axial seal reliability and the plurality of second radial teeth 101 increases radial seal reliability.
As an alternative embodiment, each second axial tooth 102 has a triangular cross section and each second radial tooth 101 has an isosceles trapezoidal cross section. The axial sealing teeth are designed into triangular shapes, so that dust is less prone to entering and the sealing effect is better; the radial seal tooth design is trapezoidal for easier machining and installation.
The tooth profile of the seal tooth in the invention can also be set to other tooth profile sections, such as isosceles triangle and the like.
Compared with the traditional servo motor, the servo motor can prevent iron powder from entering the encoder 11, reduces the risk of motor faults, is beneficial to improving the long-term running reliability of the servo motor, and has the advantages of simple structure, low cost, high feasibility and higher popularization value.
In the description of the invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. The sealing structure is characterized by comprising a rear end cover (10) and a flange (16), wherein the flange (16) is arranged between a brake (7) and an encoder (11), and sealing teeth are arranged on the rear end cover (10) and/or the flange (16).
2. The sealing structure according to claim 1, characterized in that the sealing teeth are provided to the flange (16).
3. The seal structure according to claim 2, characterized in that the seal teeth include first axial teeth (162) and first radial teeth (161), a plurality of the first axial teeth (162) being capable of achieving sealing in an axial direction of the motor shaft (13), and a plurality of the first radial teeth (161) being capable of achieving sealing in a radial direction of the motor shaft (13).
4. The sealing structure of claim 3, characterized in that a plurality of said first axial teeth (162) are provided on the outer circumferential surface of said flange (16), and a plurality of said first radial teeth (161) are provided on the end face of said flange (16) close to said rear end cap (10).
5. A sealing structure according to claim 3, characterized in that each first axial tooth (162) is triangular in cross-section and each first radial tooth (161) is isosceles trapezoidal in cross-section.
6. The sealing structure according to claim 1, characterized in that the sealing teeth are provided to the rear end cap (10).
7. The seal structure according to claim 6, characterized in that the seal teeth include a second axial tooth (102) and a second radial tooth (101), a plurality of the second axial teeth (102) being capable of effecting sealing in the axial direction of the motor shaft (13), and a plurality of the second radial teeth (101) being capable of effecting sealing in the radial direction of the motor shaft (13).
8. The sealing structure according to claim 7, characterized in that a plurality of said second axial teeth (102) are provided on the inner circumferential surface of said rear end cap (10), and a plurality of said second radial teeth (101) are provided on the end surface of said rear end cap (10) close to said flange (16).
9. The seal according to claim 7, characterized in that each of said second axial teeth (102) has a triangular cross-section and each of said second radial teeth (101) has an isosceles trapezoidal cross-section.
10. The sealing arrangement according to claim 1, characterized in that the inner diameter of the flange (16) is adapted to the outer diameter of the motor shaft (13).
11. The seal structure of claim 1, wherein the flange (16) has an inner diameter A, the flange (16) has an outer diameter B, and B-A (2-3).
12. A servo motor comprising a sealing structure according to any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011548700.6A CN112615460A (en) | 2020-12-24 | 2020-12-24 | Sealing structure and servo motor with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011548700.6A CN112615460A (en) | 2020-12-24 | 2020-12-24 | Sealing structure and servo motor with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112615460A true CN112615460A (en) | 2021-04-06 |
Family
ID=75244627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011548700.6A Pending CN112615460A (en) | 2020-12-24 | 2020-12-24 | Sealing structure and servo motor with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112615460A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591269A (en) * | 2013-10-08 | 2014-02-19 | 中国北车集团大连机车车辆有限公司 | Locomotive gear box seal device |
| CN205639568U (en) * | 2016-04-07 | 2016-10-12 | 北京康为重工机械制造有限公司 | Input axle head seal structure , high -speed gear box and use its rail vehicle |
| CN207487698U (en) * | 2017-12-04 | 2018-06-12 | 长春禹衡光学有限公司 | A kind of grating encoder |
| CN207753556U (en) * | 2017-12-26 | 2018-08-21 | 常州精纳电机有限公司 | The servo motor of band brake |
| CN109831072A (en) * | 2019-02-21 | 2019-05-31 | 珠海格力电器股份有限公司 | Electric machine |
| US20200056622A1 (en) * | 2017-04-14 | 2020-02-20 | Carrier Corporation | Sealing assembly for centrifugal compressor and centrifugal compressor having the same |
| CN210919897U (en) * | 2019-11-11 | 2020-07-03 | 诸暨市奇灵机电设备有限公司 | Electromagnetic brake with good sealing performance |
| CN214380426U (en) * | 2020-12-24 | 2021-10-08 | 珠海格力电器股份有限公司 | Sealing structure and servo motor with same |
-
2020
- 2020-12-24 CN CN202011548700.6A patent/CN112615460A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591269A (en) * | 2013-10-08 | 2014-02-19 | 中国北车集团大连机车车辆有限公司 | Locomotive gear box seal device |
| CN205639568U (en) * | 2016-04-07 | 2016-10-12 | 北京康为重工机械制造有限公司 | Input axle head seal structure , high -speed gear box and use its rail vehicle |
| US20200056622A1 (en) * | 2017-04-14 | 2020-02-20 | Carrier Corporation | Sealing assembly for centrifugal compressor and centrifugal compressor having the same |
| CN207487698U (en) * | 2017-12-04 | 2018-06-12 | 长春禹衡光学有限公司 | A kind of grating encoder |
| CN207753556U (en) * | 2017-12-26 | 2018-08-21 | 常州精纳电机有限公司 | The servo motor of band brake |
| CN109831072A (en) * | 2019-02-21 | 2019-05-31 | 珠海格力电器股份有限公司 | Electric machine |
| CN210919897U (en) * | 2019-11-11 | 2020-07-03 | 诸暨市奇灵机电设备有限公司 | Electromagnetic brake with good sealing performance |
| CN214380426U (en) * | 2020-12-24 | 2021-10-08 | 珠海格力电器股份有限公司 | Sealing structure and servo motor with same |
Non-Patent Citations (1)
| Title |
|---|
| 党瑞荣: "冲击信号的产生与测量", vol. 1, 30 September 2000, 西安地图出版社, pages: 74 - 77 * |
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