A bearing damping structure of a direct-current brushless hollow motor

Abstract

This invention discloses a bearing vibration damping structure for a brushless hollow DC motor, relating to the field of motor design. It includes a motor shaft and a rotating housing, with the rotating housing rotatably fitted onto the outside of the motor shaft. The rotating housing comprises a front shell and a rear shell, each containing a bearing chamber. Bearing grooves are formed on the outer sides of both ends of the motor shaft, and rolling bearings are fitted into these grooves. The outer rings of the rolling bearings are fitted into the bearing chambers. Rubber damping sleeves are fitted onto the outer rings of the rolling bearings, and the rolling bearings are installed in the bearing chambers via an interference fit with the rubber damping sleeves. Compared to existing technologies, this invention utilizes the bearing grooves at both ends to install the rolling bearings, reducing radial runout and axial movement. The rubber damping sleeves achieve an interference fit assembly through the elasticity of the rubber material itself, adaptively compensating for clearance when the bearing chamber deforms due to thermal expansion or centrifugal force, effectively absorbing radial vibration.

Description

Technical Field

[0001] This invention relates to the field of motor design, and in particular to a bearing damping structure for a brushless DC hollow motor. Background Technology

[0002] In existing brushless hollow DC motors, large thin-walled bearings (such as 6804 bearings) typically operate with the inner ring fixed to the motor shaft and the outer ring rotating with the rotor.

[0003] However, due to the large outer diameter of the outer ring of the thin-walled bearing, there is a clearance between the bearing and the bearing housing. During operation, radial runout and axial movement are easily generated, causing high-frequency abnormal noise and vibration.

[0004] In addition, existing bearing designs are generally designed for the inner ring to rotate, keeping the inner ring fixed while the outer ring rotates. These designs generally lack self-adjustment capabilities and cannot adaptively compensate for clearance changes caused by machining errors, thermal expansion, etc. This can lead to bearing eccentricity during motor operation, resulting in significant noise during operation. Summary of the Invention

[0005] To overcome the shortcomings mentioned above, the present invention provides a technical solution that can solve the above problems.

[0006] A bearing damping structure for a brushless hollow DC motor includes a motor shaft and a rotating housing, wherein the rotating housing is rotatably mounted on the outside of the motor shaft.

[0007] The rotating housing includes a front housing and a rear housing, which are fixedly connected to each other. The middle of both the front and rear housings is formed with a through hole to accommodate the rotation of the motor shaft. A bearing chamber is integrally formed on the inner side of the through hole. Bearing grooves are formed on the outer sides of both the front and rear ends of the motor shaft. Rolling bearings are installed in the bearing grooves, and the outer rings of the rolling bearings are installed in the bearing chambers in a corresponding manner.

[0008] A rubber damping sleeve is fitted on the outer ring of the rolling bearing, and the rolling bearing is installed in the bearing housing through the interference fit of the rubber damping sleeve. The thickness of the rubber damping sleeve is between 0.8-1.5mm, and the interference fit between the rolling bearing and the rubber damping sleeve in the bearing housing is between 0.3-0.8mm.

[0009] Furthermore: the wall thickness of the rubber damping sleeve is 1mm, and the interference fit between the rolling bearing and the rubber damping sleeve in the bearing chamber is 0.5mm.

[0010] Furthermore, the rolling bearing is a 6804 bearing.

[0011] Furthermore, the rubber damping sleeve is formed with an annular limiting flange, and the outer ring of the rolling bearing is fitted and installed on the inner side of the rubber damping sleeve and the annular limiting flange.

[0012] Furthermore, the thickness of the annular limiting flange is the same as the thickness of the rubber shock-absorbing sleeve.

[0013] Furthermore: two annular limiting flanges are provided, and the two annular limiting flanges are integrally formed on both sides of the rubber shock absorber sleeve, and the outer ring of the rolling bearing is fitted between the two annular limiting flanges.

[0014] Furthermore, at least three recessed screw fixing holes are formed on the front and rear end faces of the motor shaft, respectively.

[0015] Furthermore, at least three of the aforementioned internal countersunk screw fixing holes are arranged in a circular array on the front and rear end faces of the motor shaft.

[0016] Furthermore, a hollow perforation is formed at the axis of the motor shaft, and the inner recessed screw fixing hole is integrally formed and set on the inner wall of the hollow perforation.

[0017] Furthermore: a fixed iron core and a circuit board are fixedly installed on the outer side of the motor shaft. A copper wire winding is wound around the fixed iron core. The circuit board and the copper wire winding are electrically connected to each other. A permanent magnet ring is fixedly installed on the inner side of the rear shell. The permanent magnet ring is sleeved on the outer side of the fixed iron core. When the copper wire winding is energized, it drives the entire rotating shell to rotate on the outer side of the motor shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Rolling bearings are installed using the bearing grooves at both ends to reduce the radial runout and axial movement of the rotating housing relative to the motor shaft during rotation, thus ensuring stable operation of the motor.

[0020] 2. Rubber shock-absorbing sleeves are added. The assembly achieves an interference fit through the elasticity of the rubber material itself. The rubber shock-absorbing sleeves are used to adaptively compensate for the gap when the bearing housing deforms due to thermal expansion or centrifugal force, and can effectively absorb radial vibration.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0025] Figure 3 This is an exploded structural diagram of the present invention;

[0026] Figure 4 yes Figure 3 A structural diagram from another perspective;

[0027] Figure 5 This is a structural diagram of the motor shaft.

[0028] The diagram shows: 1. Motor shaft; 2. Rotating housing; 21. Front housing; 22. Rear housing; 3. Through hole; 4. Bearing chamber; 5. Bearing groove; 6. Rolling bearing; 7. Rubber shock absorber sleeve; 8. Annular limiting flange; 9. Inner recessed screw fixing hole; 10. Hollow perforation; 11. Fixing iron core; 12. Circuit board; 13. Permanent magnet ring; 14. Riveting position; 15. Limiting post; 16. Limiting groove; 17. Wire hole; 18. Wire. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1-5 As shown, a bearing damping structure for a brushless hollow DC motor according to the present invention includes a motor shaft 1 and a rotating housing 2, wherein the rotating housing 2 is rotatably mounted on the outside of the motor shaft 1.

[0035] The rotating outer shell 2 includes a front shell 21 and a rear shell 22, which are fixedly connected to each other. Both the front shell 21 and the rear shell 22 have through holes 3 formed in the middle to accommodate the rotation of the motor shaft 1. A bearing chamber 4 is integrally formed on the inner side of the through hole 3. Bearing grooves 5 are formed on the outer sides of both ends of the motor shaft 1. Rolling bearings 6 are installed in the bearing grooves 5. The outer rings of the rolling bearings 6 are installed in the bearing chambers 4 in a corresponding manner. The rolling bearings 6 are installed in the bearing grooves 5 at both ends to reduce the radial runout and axial movement of the rotating outer shell 2 and the motor shaft 1 during rotation, thus ensuring the stable operation of the motor.

[0036] A rubber damping sleeve 7 is fitted onto the outer ring of the rolling bearing 6, and the rolling bearing 6 is installed in the bearing chamber 4 through the interference fit of the rubber damping sleeve 7. The thickness of the rubber damping sleeve 7 is between 0.8-1.5mm, and the interference fit between the rolling bearing 6 and the rubber damping sleeve in the bearing chamber 4 is between 0.3-0.8mm. The addition of the rubber damping sleeve 7 achieves the interference fit assembly through the elasticity of the rubber material itself. The rubber damping sleeve is used to adaptively compensate for the clearance when the bearing chamber 4 deforms due to thermal expansion or centrifugal force, and can effectively absorb radial vibration.

[0037] Furthermore: the wall thickness of the rubber shock-absorbing sleeve 7 is 1mm, and the interference fit between the rolling bearing 6 and the rubber shock-absorbing sleeve in the bearing chamber 4 is 0.5mm; it can effectively adapt to the deformation caused by thermal expansion or centrifugal force, ensure the stable assembly of the rolling bearing 6, effectively absorb radial vibration, and achieve a silent effect.

[0038] Furthermore, the rolling bearing 6 is a 6804 bearing; it has high stability, with its inner ring fitted on the motor shaft 1 and its outer ring rotating with the rotating housing 2 to ensure stable operation of the motor.

[0039] Furthermore, the front shell 21 and the rear shell 22 are respectively injection molded from ABS+15GF material; they can be injection molded in one piece, which is convenient for production and processing.

[0040] Furthermore: the rubber damping sleeve 7 is formed with an annular limiting flange 8, and the outer ring of the rolling bearing 6 is fitted and installed on the inner side of the rubber damping sleeve 7 and the annular limiting flange 8; the annular limiting flange 8 is used to prevent the rubber damping sleeve 7 from axially moving or falling off when the outer ring of the rolling bearing 6 rotates, so as to ensure the stable installation of the rolling bearing 6.

[0041] Furthermore, the thickness of the annular limiting flange 8 is the same as the thickness of the rubber shock absorber sleeve 7; this facilitates the production and processing of the rubber shock absorber sleeve 7 and reduces the defect rate.

[0042] Furthermore: two annular limiting flanges 8 are provided, and the two annular limiting flanges 8 are integrally formed on both sides of the rubber shock-absorbing sleeve 7, and the outer ring of the rolling bearing 6 is fitted between the two annular limiting flanges 8; this can effectively wrap the outer ring of the rolling bearing 6, thereby ensuring stable assembly.

[0043] Furthermore: at least three recessed screw fixing holes 9 are formed on the front and rear end faces of the motor shaft 1 respectively; the at least three recessed screw fixing holes 9 reserved on the front face can be used to fix the connection between the motor and the whole machine, and the at least three recessed screw fixing holes 9 reserved on the rear face can be used to fix the external control board of the whole machine, thereby facilitating the installation and use of the motor shaft 1.

[0044] Furthermore, at least three of the inner recessed screw fixing holes 9 are arranged in a circular array on the front and rear end faces of the motor shaft 1. The circular array of inner recessed screw fixing holes 9 can ensure that the two ends of the motor shaft 1 are firmly assembled in other positions. After assembly, the rotating housing 2 rotates on the outside of the motor shaft 1 to achieve the technical effect of motor drive.

[0045] Furthermore: a hollow through hole 10 is formed at the axis of the motor shaft 1, and the inner recessed screw fixing hole 9 is integrally formed and set in the inner wall of the hollow through hole 10; the hollow through hole 10 can be used to arrange the wires 18, which facilitates the power supply and use of the motor.

[0046] Furthermore: a fixed iron core 11 and a circuit board 12 are fixedly installed on the outer side of the motor shaft 1. A copper wire winding is wound around the fixed iron core 11. The circuit board 12 and the copper wire winding are electrically connected to each other. A permanent magnet ring 13 is fixedly installed on the inner side of the rear shell 22. The permanent magnet ring 13 is sleeved on the outer side of the fixed iron core 11. When the copper wire winding is energized, it drives the entire rotating shell 2 to rotate on the outer side of the motor shaft 1. The wire 18 can supply power to the copper wire winding through the circuit board 12. When energized, the copper wire winding wound around the fixed iron core 11 can form an electromagnetic path, which matches with the permanent magnet ring 13 to drive the permanent magnet ring 13 to rotate. The permanent magnet ring 13 is fixed in the rear shell 22, so it can drive the entire rotating shell 2 to rotate, achieving the technical effect of stably driving the motor to operate.

[0047] Furthermore: a wire hole 17 is formed on the outer side of the motor shaft 1; an electric wire 18 is provided in the hollow hole 10, and the electric wire 18 in the hollow hole 10 passes through the wire hole 17 and is electrically connected to the circuit board 12.

[0048] Optionally: The outer side of the motor shaft 1 is formed with at least three riveting positions 14, the circuit board 12 has a ring structure, and the inner ring of the circuit board 12 is fixed to the motor shaft 1 through at least three riveting positions 14; this can ensure the stable installation of the circuit board 12 on the motor shaft 1; the outer side of the motor shaft 1 is formed with at least three limiting posts 15, and the inner ring of the fixing core 11 is formed with at least three limiting grooves 16, and the limiting posts 15 are installed in the limiting grooves 16 with a clearance fit; this can ensure the stable installation of the fixing core 11 on the motor shaft 1.

[0049] Furthermore, three riveting positions 14 and three limiting posts 15 are provided, and the three riveting positions 14 and three limiting posts 15 are arranged in a circular array on the outside of the motor shaft 1. The circular array of riveting positions 14 and limiting posts 15 can respectively realize the stable installation of the circuit board 12 and the fixed iron core 11 on the motor shaft 1, so that the motor shaft 1 has the effect of multiple uses, reducing the number of motor parts, enhancing stability and the probability of producing good products. At the same time, all components are assembled with the motor shaft 1 as the assembly reference, and axial fixation can be completed by locking one side, resulting in high assembly efficiency. All components are coaxially installed on a single motor shaft 1, with high concentricity, making the motor run more smoothly and helping to reduce vibration and noise. In addition, the motor structure will be more compact, saving axial space and facilitating the miniaturization design of the motor.

[0050] Furthermore, the riveting positions 14 and the limiting posts 15 are alternately staggered; this avoids the installation positions of the circuit board 12 and the fixing core 11 on the motor shaft 1, allowing them to be fixed on the motor shaft 1 without interfering with each other, resulting in higher stability.

[0051] Example 2, as Figure 2 and Figure 5 As shown, a hollow perforation 10 is formed at the axis of the motor shaft 1. A fixed iron core 11 and a circuit board 12 are fixedly installed on the outside of the motor shaft 1. A copper wire winding is wound on the fixed iron core 11. The circuit board 12 and the copper wire winding are electrically connected to each other. The hollow perforation 10 can be used to arrange wires 18, which facilitates the power supply of the circuit board 12 and the copper wire winding.

[0052] The outer side of the motor shaft 1 is formed with at least three riveting positions 14, and the circuit board 12 has a ring structure. The inner ring of the circuit board 12 is fixed to the motor shaft 1 by at least three riveting positions 14, which can ensure the stable installation of the circuit board 12 on the motor shaft 1.

[0053] At least three limiting posts 15 are formed on the outer side of the motor shaft 1, and at least three limiting grooves 16 are formed on the inner ring of the fixed iron core 11. The limiting posts 15 are installed in the limiting grooves 16 with a clearance fit, which can ensure the stable installation of the fixed iron core 11 on the motor shaft 1.

[0054] Furthermore: at least three recessed screw fixing holes 9 are formed on the front and rear end faces of the motor shaft 1 respectively; the at least three recessed screw fixing holes 9 reserved on the front face can be used to fix the connection between the motor and the whole machine, and the at least three recessed screw fixing holes 9 reserved on the rear face can be used to fix the external control board of the whole machine, thereby facilitating the installation and use of the motor shaft 1.

[0055] Furthermore: at least three of the inner recessed screw fixing holes 9 are arranged in a circular array with each other; the circular array of inner recessed screw fixing holes 9 can ensure that the two ends of the motor shaft 1 are firmly assembled in other positions. After assembly, the rotating housing 2 rotates outside the motor shaft 1 to achieve the technical effect of motor drive.

[0056] Furthermore, the recessed screw fixing hole is integrally formed in the inner wall of the hollow perforation 10, so that the recessed screw fixing hole is integrally formed and hidden in the hollow perforation 10 of the motor shaft 1, reducing the number of assembly parts.

[0057] Furthermore: A rotating housing 2 is rotatably mounted on the outer side of the motor shaft 1, and a permanent magnet ring 13 is fixedly mounted on the inner side of the rotating housing 2. The permanent magnet ring 13 is sleeved on the outer side of the fixed iron core 11. When the copper wire winding is energized, it drives the rotating housing 2 to rotate on the outer side of the motor shaft 1. The wire 18 can supply power to the copper wire winding through the circuit board 12. When energized, the copper wire winding is wound around the fixed iron core 11 to form an electromagnetic path, which matches with the permanent magnet ring 13 to drive the permanent magnet ring 13 to rotate. The permanent magnet ring 13 is fixed in the fixed iron core 11, so it can drive the entire rotating housing 2 to rotate, achieving the technical effect of stably driving the motor to operate.

[0058] Furthermore, three riveting positions 14 and three limiting posts 15 are provided, and the three riveting positions 14 and three limiting posts 15 are arranged in a circular array on the outside of the motor shaft 1. The circular array of riveting positions 14 and limiting posts 15 can respectively realize the stable installation of the circuit board 12 and the fixed iron core 11 on the motor shaft 1, so that the motor shaft 1 has the effect of multiple uses, reducing the number of motor parts, enhancing stability and the probability of producing good products. At the same time, all components are assembled with the motor shaft 1 as the assembly reference, and axial fixation can be completed by locking one side, resulting in high assembly efficiency. All components are coaxially installed on a single motor shaft 1, with high concentricity, making the motor run more smoothly and helping to reduce vibration and noise. In addition, the motor structure will be more compact, saving axial space and facilitating the miniaturization design of the motor.

[0059] Furthermore, the riveting positions 14 and the limiting posts 15 are alternately staggered; this avoids the installation positions of the circuit board 12 and the fixing core 11 on the motor shaft 1, allowing them to be fixed on the motor shaft 1 without interfering with each other, resulting in higher stability.

[0060] Furthermore: a wire hole 17 is formed on the outer side of the motor shaft 1; an electric wire 18 is provided in the hollow hole 10, and the electric wire 18 in the hollow hole 10 passes through the wire hole 17 and is electrically connected to the circuit board 12.

[0061] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A bearing damping structure for a brushless hollow DC motor, comprising a motor shaft and a rotating housing, wherein the rotating housing is rotatably mounted on the outside of the motor shaft; characterized in that: The rotating housing includes a front housing and a rear housing, which are fixedly connected to each other. The middle of both the front and rear housings is formed with a through hole to accommodate the rotation of the motor shaft. A bearing chamber is integrally formed on the inner side of the through hole. Bearing grooves are formed on the outer sides of both the front and rear ends of the motor shaft. Rolling bearings are installed in the bearing grooves, and the outer rings of the rolling bearings are installed in the bearing chambers in a corresponding manner. A rubber damping sleeve is fitted on the outer ring of the rolling bearing, and the rolling bearing is installed in the bearing housing through the interference fit of the rubber damping sleeve. The thickness of the rubber damping sleeve is between 0.8-1.5mm, and the interference fit between the rolling bearing and the rubber damping sleeve in the bearing housing is between 0.3-0.8mm.

2. The bearing vibration damping structure for a brushless hollow DC motor according to claim 1, characterized in that: The wall thickness of the rubber damping sleeve is 1mm, and the interference fit between the rolling bearing and the rubber damping sleeve in the bearing chamber is 0.5mm.

3. The bearing vibration damping structure for a brushless hollow DC motor according to claim 1, characterized in that: The rolling bearing is a 6804 bearing.

4. The bearing damping structure of a direct-current brushless hollow motor according to claim 1, characterized in that: The rubber damping sleeve is formed with an annular limiting flange, and the outer ring of the rolling bearing is fitted and installed on the inner side of the rubber damping sleeve and the annular limiting flange.

5. The bearing damping structure of a direct-current brushless hollow motor according to claim 4, characterized in that: The thickness of the annular limiting flange is the same as the thickness of the rubber shock-absorbing sleeve.

6. The bearing damping structure of a direct-current brushless hollow motor according to claim 4, characterized in that: Two annular limiting flanges are provided, and the two annular limiting flanges are integrally formed on both sides of the rubber shock absorber sleeve, and the outer ring of the rolling bearing is fitted between the two annular limiting flanges.

7. The bearing vibration damping structure for a brushless hollow DC motor according to claim 1, characterized in that: At least three recessed screw fixing holes are formed on the front and rear end faces of the motor shaft, respectively.

8. The bearing vibration damping structure for a brushless hollow DC motor according to claim 7, characterized in that: At least three of the aforementioned internal countersunk screw fixing holes are arranged in a circular array on the front and rear end faces of the motor shaft.

9. A bearing vibration damping structure for a brushless hollow DC motor according to any one of claims 1 or 7, characterized in that: A hollow perforation is formed at the axis of the motor shaft, and the inner recessed screw fixing hole is integrally formed and set on the inner wall of the hollow perforation.

10. The bearing vibration damping structure for a brushless hollow DC motor according to claim 1, characterized in that: A fixed iron core and a circuit board are fixedly installed on the outside of the motor shaft. A copper wire winding is wound around the fixed iron core. The circuit board and the copper wire winding are electrically connected to each other. A permanent magnet ring is fixedly installed on the inside of the rear shell. The permanent magnet ring is sleeved on the outside of the fixed iron core. When the copper wire winding is energized, it drives the entire rotating shell to rotate on the outside of the motor shaft.

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