A direct current motor

Abstract

The utility model provides a kind of direct current motor, stop component and bearing are sequentially arranged on end cover along first direction, the end of rotating shaft is abutted on stop component after passing through bearing along second direction, stop component limits the axial movement of rotating shaft, gap is formed between gasket and bearing, the interval of gap is preset value, gasket and bearing are abutted when stop component is worn to preset value along second direction by rotating shaft, at this time, the end of rotating shaft and stop piece form a support point and gasket and bearing form another support point, when rotating shaft and rotor assembly rotate, the above two support points form support to rotating shaft and rotor assembly together, ensure motor durability.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a direct current motor. BACKGROUND

[0002] Motor as realizes electric energy conversion for mechanical energy a kind of power device, it has been widely applied in social production. It is mainly used to the rotation magnetic field generated by electric coil (also called stator winding) and acts on rotor (armature iron core) and forms magnetic electric power rotation torque. Motor rotor performance directly influences the performance of motor as a whole.

[0003] Many motor rotors and motor shafts are fixed as a whole at present, but due to rotor assembly and its load gravity or installation precision and other reasons, rotor will occur axial movement in the process of motor operation. The motor in the prior art is the end of rotating shaft and the contact of end cover stop sheet. When motor works, the end of rotating shaft is tightly pressed against stop sheet for mechanical friction. This working mode has been applied to motor for a very long time, and it is still the mainstream of motor installation mode. However, this mode has certain defects. If stop sheet is worn out, motor will produce abnormal sound and functional failure. INVENTION CONTENTS

[0004] Therefore, the utility model aims at providing a direct current motor, which aims at solving the problem that in the prior art, when motor works, the end of rotating shaft is tightly pressed against stop sheet for mechanical friction, and if stop sheet is worn out, motor will produce abnormal sound and functional failure.

[0005] The utility model provides a direct current motor, including end cover, rotating shaft, rotor assembly, stop component, bearing and gasket, the rotor assembly is located on the circumferential side of rotating shaft, the rotor assembly is used for driving rotating shaft rotation, stop component and bearing are sequentially located on the end cover along first direction, the end of rotating shaft is tightly pressed against stop component after passing bearing along second direction, stop component is used for limiting the axial movement of rotating shaft, gasket is sleeved on the circumferential side of rotating shaft and is tightly pressed against rotor assembly, gasket and rotor assembly are sequentially arranged along first direction, the clearance is formed between gasket and bearing, the interval of clearance is preset value, gasket is used for being tightly pressed against bearing when stop component is worn to preset value along second direction by rotating shaft, and first direction is opposite to second direction.

[0006] According to some embodiments of the present invention, the stop assembly includes a first stop plate and a second stop plate, the first stop plate and the second stop plate are stacked sequentially along the second direction, the second stop plate abuts against the end cap, the rotating shaft abuts against the first stop plate, the coefficient of friction between the first stop plate and the rotating shaft is less than the coefficient of friction between the second stop plate and the rotating shaft, and the rigidity of the second stop plate is greater than the rigidity of the second stop plate.

[0007] According to some embodiments of the present invention, the preset value is 40%-60% of the thickness of the first stop piece.

[0008] According to some embodiments of the present invention, the thickness of the first stop piece is any value among 0.2mm, 0.3mm or 0.5mm.

[0009] According to some embodiments of the present invention, the first stop sheet is made of graphite, PET or PEEK.

[0010] According to some embodiments of the present invention, the second stop plate is made of stainless steel.

[0011] According to some embodiments of this utility model, the gasket has a double-layer structure.

[0012] According to some embodiments of the present invention, the inner diameter of the gasket is larger than the outer diameter of the rotating shaft, and the inner diameter of the gasket is provided with a protrusion, which is used to abut against the circumference of the rotating shaft.

[0013] According to some embodiments of the present invention, the rotor assembly includes an oil baffle, a commutator, a varistor, an iron chip, and a winding assembly. The oil baffle, the commutator, and the iron chip are disposed on the circumference of the rotating shaft along the first direction. The varistor is sleeved on the outer circumference of the commutator. The winding assembly is wound around the iron chip and electrically connected to the commutator. The oil baffle abuts against the gasket.

[0014] According to some embodiments of the present invention, the end cap is provided with a carbon frame, and the carbon frame is provided with a carbon brush, which is used to abut against the commutator.

[0015] Beneficial effects: This utility model provides a DC motor in which a stop assembly and a bearing are sequentially arranged on an end cover along a first direction. The end of the rotating shaft passes through the bearing along a second direction and abuts against the stop assembly. The stop assembly restricts the axial movement of the rotating shaft. A gap is formed between the shim and the bearing, and the gap spacing is a preset value. When the stop assembly is worn down to the preset value by the rotating shaft along the second direction, the shim abuts against the bearing. At this time, the end of the rotating shaft and the stop shim form a support point, and the shim and the bearing form another support point. When the rotating shaft and the rotor assembly rotate, the above two support points together provide support for the rotating shaft and the rotor assembly, ensuring the durability of the motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the DC motor of this utility model;

[0018] Figure 2 This is a cross-sectional view of the DC motor of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the gasket of this utility model.

[0021] In the diagram: 1. End cap; 11. Carbon frame; 12. Carbon brush; 2. Shaft; 31. Oil baffle; 32. Commutator; 33. Varistor; 34. Iron chip; 35. Winding assembly; 41. First stop plate; 42. Second stop plate; 5. Bearing; 6. Gasket; 61. Protrusion. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figures 1 to 4This utility model provides a DC motor, including an end cover 1, a rotating shaft 2, a rotor assembly, a stop assembly, a bearing 5, and a gasket 6. The rotor assembly is disposed on the circumference of the rotating shaft 2 and is used to drive the rotating shaft 2 to rotate. The stop assembly and the bearing 5 are sequentially disposed on the end cover 1 along a first direction. The end of the rotating shaft 2 passes through the bearing 5 along a second direction and abuts against the stop assembly. The stop assembly is used to restrict the axial movement of the rotating shaft 2. The gasket 6 is sleeved on the circumference of the rotating shaft 2 and abuts against the rotor assembly. The gasket 6 and the rotor assembly are sequentially disposed along the first direction. A gap is formed between the gasket 6 and the bearing 5. The spacing of the gap is a preset value. The gasket 6 is used to abut against the bearing 5 when the stop assembly is worn down to the preset value by the rotating shaft 2 along the second direction. The first direction is opposite to the second direction.

[0024] For ease of understanding, such as Figure 1 As shown, the first direction is vertically upward, and the second direction is vertically upward. In this application, the stop assembly restricts the axial movement of the shaft 2. It absorbs the axial impact force generated by the shaft 2 during startup, shutdown, or load changes, preventing the rotor from hard colliding with the motor end cover 1 or other fixed components. Long-term axial impact, poor lubrication, material fatigue, improper installation, or excessive axial force can all lead to accelerated wear of the stop plate. Since a gap is formed between the gasket 6 and the bearing 5, and the gap spacing is a preset value, when the stop assembly is worn to the preset value by the shaft 2 along the second direction, the gasket 6 abuts against the bearing 5. At this time, the end of the shaft 2 and the stop plate form a support point, and the gasket 6 and the bearing 5 form another support point. When the shaft 2 and the rotor assembly rotate, the above two support points jointly support the shaft 2 and the rotor assembly, ensuring the durability of the motor.

[0025] According to some embodiments of this utility model, the stopping assembly includes a first stopping plate 41 and a second stopping plate 42. The first stopping plate 41 and the second stopping plate 42 are stacked sequentially along the second direction. The second stopping plate 42 abuts against the end cap 1, and the rotating shaft 2 abuts against the first stopping plate 41. The coefficient of friction between the first stopping plate 41 and the rotating shaft 2 is less than the coefficient of friction between the second stopping plate 42 and the rotating shaft 2. The rigidity of the second stopping plate 42 is greater than that of the first stopping plate 41. In this embodiment, the arrangement of the first stopping plate 41 and the second stopping plate 42 can significantly reduce friction noise, reduce wear, and improve system reliability while ensuring the axial restraint function. Preferably, the first stopping plate 41 is made of graphite, PET, or PEEK, and the second stopping plate 42 is made of stainless steel. Taking the first stopping plate 41 as PEEK and the second stopping plate 42 as stainless steel as an example. The self-lubricating properties of PEEK result in a friction coefficient with shaft 2 that is much lower than that between metals (shaft 2 and stainless steel). PEEK is a polymer material that effectively suppresses high-frequency vibrations and avoids the characteristic "whistling" noise of metal friction. Furthermore, PEEK has high mechanical strength and maintains stability, especially at high temperatures. The second stop plate 42 provides rigid support, protecting the motor end cover 1. Stainless steel has high rigidity, preventing PEEK from deforming or crushing under axial impact, and avoiding direct wear of the end cover 1 by shaft 2 after PEEK failure.

[0026] Preferably, the preset value is 40%-60% of the thickness of the first stop piece 41.

[0027] Preferably, the thickness of the first stop piece 41 is any one of 0.2 mm, 0.3 mm or 0.5 mm.

[0028] Preferably, the gasket 6 has a double-layer structure.

[0029] According to some embodiments of this utility model, the inner diameter of the gasket 6 is larger than the outer diameter of the rotating shaft 2, and the inner diameter of the gasket 6 is provided with a protrusion 61, which is used to abut against the circumference of the rotating shaft 2. In traditional motors, the gasket 6 adopts a round hole design, usually in two ways: tight fit with the rotating shaft 2 or loose fit with the rotating shaft 2. The gasket 6 with the tight fit is prone to wear, and when the gasket 6 is worn, its function will be severely reduced and it will fail. The gasket 6 with the loose fit is prone to falling off during the production process, with a high defect rate and difficult assembly. In this embodiment, the gasket 6 is made of graphite material, which has the characteristics of temperature resistance, wear resistance, and low noise due to mechanical friction. The protrusion 61 is tight fit with the rotating shaft 2, while other positions are loose fit with the rotating shaft 2. When the rotor rotates at high speed, the gasket 6 can rotate asynchronously with the rotor, increasing the wear time of the gasket 6 and thus achieving the purpose of extending the life of the motor. In this embodiment, the gasket 6 is partially tightly fitted to the shaft 2 to ensure that it will not fall off during assembly, while other parts are loosely fitted to the shaft 2 to reduce mechanical friction during the rotation of the shaft 2 and ensure the life of the motor.

[0030] According to some embodiments of this utility model, the rotor assembly includes an oil baffle 31, a commutator 32, a varistor 33, an iron chip 34, and a winding assembly 35. The oil baffle 31, the commutator 32, and the iron chip 34 are disposed on the circumference of the rotating shaft 2 along the first direction. The varistor 33 is sleeved on the outer circumference of the commutator 32. The winding assembly 35 is wound around the iron chip 34 and electrically connected to the commutator 32. The oil baffle 31 abuts against the gasket 6. A carbon frame 11 is provided on the end cover 1, and a carbon brush 12 is provided on the carbon frame 11. The carbon brush 12 is used to abut against the commutator 32. Current is input through the stationary carbon brush 12, which maintains sliding contact with the surface of the rotating commutator 32. Current flows into the rotating winding assembly 35 through the commutator 32. The winding assembly 35 rotates under the force (Lorentz force) in the stator magnetic field. The rotating shaft 2 drives the commutator 32, which is rigidly connected to it, to rotate together. During the rotation of the commutator 32, its different copper plates contact the fixed brushes in a designed sequence, thereby automatically changing the direction of the current in the winding assembly 35, ensuring that the rotor can continuously rotate in one direction. Since the bearing 5 requires a continuous supply of lubricating oil, when the bearing 5 rotates, centrifugal force is generated, which may throw excess lubricating oil outwards along the shaft. The oil baffle 31 is mounted on the shaft (usually close to the inside of the bearing 5) and rotates with the shaft. Its structure can effectively block or change the direction of the thrown lubricating oil, guiding it back to the bearing 5 cavity and preventing lubricating oil from flowing into the electrical parts inside the motor along the shaft. During installation, the oil baffle 31 abuts against the gasket 6.

[0031] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A DC motor, characterized in that: The assembly includes an end cap (1), a rotating shaft (2), a rotor assembly, a stop assembly, a bearing (5), and a gasket (6). The rotor assembly is disposed on the circumference of the rotating shaft (2) and is used to drive the rotating shaft (2) to rotate. The stop assembly and the bearing (5) are sequentially disposed on the end cap (1) along a first direction. The end of the rotating shaft (2) passes through the bearing (5) along a second direction and abuts against the stop assembly. The stop assembly is used to restrict the axial movement of the rotating shaft (2). The gasket (6) is sleeved on the circumference of the rotating shaft (2) and abuts against the rotor assembly. The gasket (6) and the rotor assembly are sequentially disposed along the first direction. A gap is formed between the gasket (6) and the bearing (5). The spacing of the gap is a preset value. The gasket (6) is used to abut against the bearing (5) when the stop assembly is worn down to the preset value by the rotating shaft (2) along the second direction. The first direction is opposite to the second direction.

2. The DC motor according to claim 1, characterized in that: The stop assembly includes a first stop plate (41) and a second stop plate (42). The first stop plate (41) and the second stop plate (42) are stacked sequentially along the second direction. The second stop plate (42) abuts against the end cap (1). The rotating shaft (2) abuts against the first stop plate (41). The coefficient of friction between the first stop plate (41) and the rotating shaft (2) is less than the coefficient of friction between the second stop plate (42) and the rotating shaft (2). The rigidity of the second stop plate (42) is greater than that of the second stop plate (42).

3. The DC motor according to claim 2, characterized in that: The preset value is 40%-60% of the thickness of the first stop piece (41).

4. The DC motor according to claim 2, characterized in that: The thickness of the first stop piece (41) is any value of 0.2 mm, 0.3 mm or 0.5 mm.

5. The DC motor according to claim 2, characterized in that: The first stop sheet (41) is made of graphite, PET or PEEK.

6. The DC motor according to claim 2, characterized in that: The second stop plate (42) is made of stainless steel.

7. The DC motor according to claim 1, characterized in that: The gasket (6) has a double-layer structure.

8. The DC motor according to claim 1, characterized in that: The inner diameter of the gasket (6) is larger than the outer diameter of the shaft (2), and the inner diameter of the gasket (6) is provided with a protrusion (61), which is used to abut against the circumference of the shaft (2).

9. The DC motor according to claim 1, characterized in that: The rotor assembly includes an oil baffle (31), a commutator (32), a varistor (33), an iron chip (34), and a winding assembly (35). The oil baffle (31), the commutator (32), and the iron chip (34) are disposed on the periphery of the rotating shaft (2) along the first direction. The varistor (33) is sleeved on the outer periphery of the commutator (32). The winding assembly (35) is wound around the iron chip (34) and electrically connected to the commutator (32). The oil baffle (31) abuts against the gasket (6).

10. The DC motor according to claim 9, characterized in that: The end cap (1) is provided with a carbon frame (11), and the carbon frame (11) is provided with a carbon brush (12), which is used to abut against the commutator (32).

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