Direct-current motor static ring press-fitting device
By designing the static ring pressing device of the DC motor, the limiting mechanism of the stress-retaining ring and the compression block is used to solve the problems of static ring shell deformation and graphite ring damage, and a more efficient and reliable static ring assembly process is achieved.
Patent Information
- Application Number
- CN202420398395.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing static ring assembly methods of DC motors have problems of deformation and high damage rate of the static ring shell, and the graphite ring is easily damaged during the assembly process, resulting in seal failure.
A DC motor static ring pressure installation device is designed, including a force-retaining ring and a pressure block. The downward pressure of the pressure block is limited by the force-retaining ring to prevent the deformation of the static ring shell and abut against the static ring through the contact ring. Connect to avoid contact with the graphite ring and reduce damage to the graphite ring.
It effectively prevents deformation and damage of the static ring shell, reduces the risk of assembly quality, improves the assembly efficiency of graphite rings, and reduces the possibility of seal failure.
Smart Images
Figure CN222449109U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of DC motor static ring assembly, in particular to a DC motor static ring press-assembly device. Background Art
[0002] The DC motor is an important accessory of the APU engine of a certain type of aircraft, and is used as a starter to start the APU engine. To prevent the infiltration of lubricating oil, the DC motor is equipped with a dynamic friction sealing system, which consists of a dynamic ring and a static ring. The dynamic ring is installed on the hollow shaft of the armature and rotates with the armature when the motor is running. The static ring is installed in the bushing of the stator end cover. During assembly, the polished surface of the dynamic ring is pressed against the smooth surface of the static graphite ring, thereby playing the role of dynamic friction sealing.
[0003] In the existing press-fit technology, when the stationary ring needs to be installed in the bushing of the stator end cover, the graphite ring, corrugated washer and flat washer in the stationary ring must be taken out first, and then the stationary ring is placed in the bushing opening of the stator end cover, and then a metal plate is placed on the stationary ring, and then the metal plate is pressed by a press machine to press the stationary ring into the bushing of the stator end cover. After the press-fitting is completed, the graphite ring, corrugated washer and flat washer are assembled into the stationary ring. This assembly method has the following disadvantages and shortcomings:
[0004] (1) This method uses a metal flat plate for press-fitting without a limit device, which easily causes force deflection during assembly. In addition, the thickness of the static ring shell is only 1 mm, which easily causes deformation of the static ring shell. The damage rate of the static ring shell is high during press-fitting.
[0005] (2) In this method, since the graphite ring protrudes from the stationary ring, the graphite ring, corrugated washer and flat washer in the stationary ring must be taken out first. After the stationary ring is assembled, the graphite ring, corrugated washer and flat washer are installed into the stationary ring. The graphite ring is easily damaged during the assembly process of the stationary ring, causing the stationary ring to be damaged and fail, resulting in sealing failure. Utility Model Content
[0006] In view of this, it is necessary to provide a DC motor static ring press-fitting device to ensure that the static ring housing is not deformed during press-fitting during the assembly process of the DC motor static ring, thereby reducing the assembly quality risk and reducing the damage rate of the graphite ring during the static ring assembly process.
[0007] In order to achieve the above-mentioned purpose, the utility model provides a static ring press-fitting device for a DC motor, comprising a force-bearing retaining ring and a pressing block;
[0008] The force-bearing retaining ring is used to be sleeved on the stator end cover of the DC motor;
[0009] The pressing block comprises a sliding ring and a contact ring. The sliding ring is slidably inserted in the force-bearing retaining ring. One end of the contact ring is fixed to the sliding ring, and the other end of the contact ring is used to abut against a stationary ring located in the stator end cover.
[0010] In some embodiments, the force-bearing retaining ring includes a sleeve portion and a limiting portion, the sleeve portion is annular and is used to be sleeved on the stator end cover, and the limiting portion is fixed inside the sleeve portion and is used for the sliding ring to be slidably inserted.
[0011] In some embodiments, the sleeve portion and the limiting portion are integrally formed.
[0012] In some embodiments, an annular groove is formed on the lower end surface of the limiting portion, and the flange of the stator end cover is located in the annular groove.
[0013] In some embodiments, the sleeve portion is a steel sleeve portion.
[0014] In some embodiments, the limiting portion is a steel limiting portion.
[0015] In some embodiments, the pressing block further includes a cover plate, and the cover plate is fixedly covered on the sliding ring.
[0016] In some embodiments, the sliding ring, the contact ring and the cover plate are integrally formed.
[0017] In some embodiments, when the lower end surface of the stationary ring is pressed into place, the lower end surface of the cover plate abuts against the force-bearing retaining ring.
[0018] In some embodiments, the sliding ring is a steel sliding ring, the contact ring is a steel contact ring, and the cover plate is a steel cover plate.
[0019] Compared with the prior art, the beneficial effect of the technical solution proposed by the utility model is: when installing the stationary ring, first make the stator end cover of the DC motor in an upward position, then put the force retaining ring on the stator end cover, then put the stationary ring into the force retaining ring, then insert the sliding ring of the pressure block into the force retaining ring, and make the lower end of the contact ring abut against the stationary ring, and then press the pressure block down through the press machine to make the stationary ring installed in the stator end cover to achieve the installation of the stationary ring. When the utility model is in use, the downward pressing process of the pressure block can be limited by the force retaining ring to prevent the pressure block from being deflected during the downward pressing process, causing the outer shell of the stationary ring to deform. At the same time, since the contact ring only abuts against the stationary ring and does not abut against the graphite ring, it is not necessary to remove the graphite ring during assembly, and the installation of the stationary ring can be achieved in one step, avoiding damage to the graphite ring caused by disassembly and assembly, and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a static ring press-fitting device for a DC motor provided by the utility model;
[0021] Figure 2 yes Figure 1 Left view of
[0022] Figure 3 yes Figure 2 Section view of mid-section AA;
[0023] Figure 4 yes Figure 3 A partial enlarged view of the middle area B;
[0024] Figure 5 yes Figure 1 An exploded view of the static ring press-fit device for a DC motor;
[0025] In the figure: 100-static ring pressing device of DC motor, 110-force retaining ring, 111-sleeving part, 112-limiting part, 1121-annular groove, 120-pressing block, 121-sliding ring, 122-contact ring, 123-cover plate, 200-stator end cover, 210-flange, 300-static ring, 400-graphite ring, 500-pressing machine. DETAILED DESCRIPTION
[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.
[0027] Please refer to Figure 1-Figure 5 The utility model provides a DC motor static ring press-fitting device 100, comprising a force-bearing retaining ring 110 and a pressing block 120;
[0028] The force-bearing retaining ring 110 is used to be sleeved on the stator end cover 200 of the DC motor;
[0029] The pressing block 120 includes a sliding ring 121 and a contact ring 122 . The sliding ring 121 is slidably inserted in the force-bearing retaining ring 110 . One end of the contact ring 122 is fixed to the sliding ring 121 , and the other end of the contact ring 122 is used to abut against the stationary ring 300 located in the stator end cover 200 .
[0030] When installing the stationary ring 300, first make the stator end cover 200 of the DC motor face upward, then put the force retaining ring 110 on the stator end cover 200, then put the stationary ring 300 (without removing the graphite ring 400 therein) into the force retaining ring 110, then insert the sliding ring 121 of the pressing block 120 into the force retaining ring 110, and make the lower end of the contact ring 122 abut against the stationary ring 300, and then press the pressing block 120 downward by the press machine 500 to install the stationary ring 300 into the stator end cover 200, so as to achieve the installation of the stationary ring 300. When the utility model is in use, the downward pressing process of the pressure block 120 can be limited by the force retaining ring 110, so as to prevent the pressure block 120 from being deflected during the downward pressing process and causing the outer shell of the stationary ring 300 to be deformed. At the same time, since the contact ring 122 only abuts against the stationary ring 300 and does not abut against the graphite ring 400, it is not necessary to remove the graphite ring 400 during assembly, and the installation of the stationary ring 300 can be achieved in one step, thus avoiding damage to the graphite ring 400 caused by disassembly and assembly, and improving the assembly efficiency.
[0031] In order to realize the function of the force retaining ring 110, please refer to Figure 3 and Figure 4 In a preferred embodiment, the force retaining ring 110 includes a sleeve portion 111 and a limiting portion 112. The sleeve portion 111 is annular and is used to be sleeved on the stator end cover 200. The limiting portion 112 is fixed to the inside of the sleeve portion 111 and is used for the sliding ring 121 to be slidably inserted.
[0032] For ease of processing, please refer to Figure 3 and Figure 4 In a preferred embodiment, the sleeve portion 111 and the limiting portion 112 are integrally formed.
[0033] In order to improve the fit between the force-bearing retaining ring 110 and the stator end cover 200, please refer to Figure 3 and Figure 4 In a preferred embodiment, an annular groove 1121 is formed on the lower end surface of the limiting portion 112 , and the flange 210 of the stator end cover 200 is located in the annular groove 1121 .
[0034] In order to improve the strength of the sleeve portion 111, please refer to Figure 3 and Figure 4 In a preferred embodiment, the sleeve portion 111 is a steel sleeve portion.
[0035] In order to improve the strength of the limiting portion 112, please refer to Figure 3 and Figure 4 In a preferred embodiment, the limiting portion 112 is a steel limiting portion.
[0036] In order to realize the connection between the sliding ring 121 and the press 500, please refer to Figure 3-Figure 5 In a preferred embodiment, the pressing block 120 further includes a cover plate 123 , and the cover plate 123 is fixedly covered on the sliding ring 121 .
[0037] To facilitate the processing of the pressing block 120, please refer to Figure 3-Figure 5 In a preferred embodiment, the sliding ring 121, the contact ring 122 and the cover plate 123 are integrally formed.
[0038] To prevent the stationary ring 300 from being crushed, please refer to Figure 3-Figure 5 In a preferred embodiment, when the lower end surface of the stationary ring 300 is pressed into place, the lower end surface of the cover plate 123 abuts against the force-bearing retaining ring 110, thereby preventing the stationary ring 300 from being further squeezed after being installed in place.
[0039] In order to improve the strength of the pressing block 120, please refer to Figure 3-Figure 5 In a preferred embodiment, the sliding ring 121 is a steel sliding ring, the contact ring 122 is a steel contact ring, and the cover plate 123 is a steel cover plate.
[0040] In order to better understand the present invention, the following Figure 1-Figure 5 The working process of the DC motor static ring pressing device provided by the utility model is described in detail: when installing the static ring 300, first make the stator end cover 200 of the DC motor in an upward position, then put the force retaining ring 110 on the stator end cover 200, then put the static ring 300 (without removing the graphite ring 400 therein) into the force retaining ring 110, then insert the sliding ring 121 of the pressing block 120 into the force retaining ring 110, and make the lower end of the contact ring 122 abut against the static ring 300, and then press the pressing block 120 downward by the press machine 500 to install the static ring 300 into the stator end cover 200, so as to realize the installation of the static ring 300. When the utility model is in use, the downward pressing process of the pressure block 120 can be limited by the force retaining ring 110, so as to prevent the pressure block 120 from being deflected during the downward pressing process and causing the outer shell of the stationary ring 300 to be deformed. At the same time, since the contact ring 122 only abuts against the stationary ring 300 and does not abut against the graphite ring 400, it is not necessary to remove the graphite ring 400 during assembly, and the installation of the stationary ring 300 can be achieved in one step, avoiding damage to the graphite ring 400 caused by disassembly and assembly, and improving the assembly efficiency. In addition, the pressure block structure of the device can be just embedded in the installation hole of the stator end cover 200, so that the stationary ring 300 is pressed to a lower bottom, thereby enhancing the sealing effect.
[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.
Claims
1. A DC motor static ring press-fitting device, characterized in that: Including a force-bearing retaining ring and a pressure block; The force-bearing retaining ring is used to be sleeved on the stator end cover of the DC motor; The pressing block comprises a sliding ring and a contact ring. The sliding ring is slidably inserted in the force-bearing retaining ring. One end of the contact ring is fixed to the sliding ring, and the other end of the contact ring is used to abut against a stationary ring located in the stator end cover.
2. The DC motor static ring press-fitting device according to claim 1 is characterized in that: The force-bearing retaining ring comprises a sleeve portion and a limiting portion. The sleeve portion is annular and is used to be sleeved on the stator end cover. The limiting portion is fixed inside the sleeve portion and is used for the sliding ring to be slidably inserted.
3. The DC motor static ring press-fitting device according to claim 2 is characterized in that: The sleeve portion and the limiting portion are integrally formed.
4. The DC motor static ring press-fitting device according to claim 2, characterized in that: An annular groove is formed on the lower end surface of the limiting portion, and the flange of the stator end cover is located in the annular groove.
5. The DC motor static ring press-fitting device according to claim 2, characterized in that: The sleeve portion is a steel sleeve portion.
6. The DC motor static ring press-fitting device according to claim 2, characterized in that: The limiting part is a steel limiting part.
7. The DC motor static ring press-fitting device according to claim 1, characterized in that: The pressing block further comprises a cover plate, and the cover plate is fixedly covered on the sliding ring.
8. The DC motor static ring press-fitting device according to claim 7, characterized in that: The sliding ring, the contact ring and the cover plate are integrally formed.
9. The DC motor static ring press-fitting device according to claim 7, characterized in that: When the lower end surface of the stationary ring is pressed into place, the lower end surface of the cover plate abuts against the force-bearing retaining ring.
10. The DC motor static ring press-fitting device according to claim 7, characterized in that: The sliding ring is a steel sliding ring, the contact ring is a steel contact ring, and the cover plate is a steel cover plate.