motor

Abstract

A motor is provided to solve the problem of bearing electric erosion caused by the current conduction loop. The motor comprises a shaft tube, the outer periphery of which is provided with a stator set; at least one bearing located in the shaft tube; a rotor provided with a rotating shaft, the rotating shaft being rotatably located in the shaft tube through the at least one bearing; and at least one insulating member located between the shaft tube and the at least one bearing, or / and the at least one insulating member located between the at least one bearing and the rotating shaft. Thus, the motor can maintain smooth operation.

Description

Technical Field

[0001] This utility model relates to a motor part, and more particularly to a motor that blocks current circuits. Background Technology

[0002] Existing motors include a shaft tube and a rotating shaft. Two ball bearings are axially spaced within the shaft tube, located between the inner wall of the shaft tube and the rotating shaft, allowing the rotating shaft to rotate within the shaft tube via the two ball bearings. A stator core can be arranged around the outer periphery of the shaft tube. Current flowing through the stator core generates magnetic force, driving the rotor to rotate. However, since the shaft tube, ball bearings, and rotating shaft are all made of metal, when current is applied to the stator core, the current can easily flow from the stator core through the shaft tube and one of the ball bearings, then through the rotating shaft, and finally back to the stator core via the other ball bearing and the shaft tube, forming a current circuit. Alternatively, the current can flow from the stator core through the shaft tube and one of the ball bearings, through the hub, and then through the induced current between the hub and the stator core, forming a current circuit. Both of these scenarios can lead to bearing erosion in the motor components. Utility Model Content

[0003] To solve the above problems, the purpose of this utility model is to provide a motor that can block the current conduction circuit within the motor components.

[0004] The directional terms or similar terms used throughout this utility model, such as "front", "back", "left", "right", "top", "bottom", "inner", "outer", "side", etc., are mainly for reference to the directions in the accompanying drawings. Each directional term or similar term is only used to assist in explaining and understanding the various embodiments of this utility model and is not intended to limit this utility model.

[0005] The use of the quantifiers “a” or “an” for the elements and components described throughout this utility model is merely for convenience and to provide the general meaning of the scope of this utility model; in this utility model, it should be interpreted as including one or at least one, and a single concept also includes multiple cases, unless it clearly means otherwise.

[0006] The terms “first,” “second,” … and “Nth” used throughout this utility model are mainly used to distinguish different elements or features (such as elements, directions, or steps), and do not indicate the maximum or minimum number of these elements or features possessed by a corresponding subject or method, nor do they limit the order of priority.

[0007] The terms "combination," "integration," or "assembly" used throughout this utility model mainly include those that allow for separation without damaging the components after connection, or those that make the components inseparable after connection. Those skilled in the art can choose the appropriate term based on the material of the components to be connected or the assembly requirements.

[0008] The motor of this utility model includes: a shaft tube having a certain sub-assembly on its outer periphery; at least one bearing located inside the shaft tube; a rotor having a rotating shaft rotatably located inside the shaft tube via the at least one bearing; and at least one insulating member located between the shaft tube and the at least one bearing, or / and the at least one insulating member located between the at least one bearing and the rotating shaft.

[0009] Therefore, the motor of this utility model, through the contact between the at least one bearing and the shaft tube or the rotating shaft formed by the at least one insulating member, can block the current of the stator assembly from forming a conductive circuit with the rotating shaft, thereby avoiding the formation of a conductive circuit, eliminating bearing electrolytic corrosion, and achieving the effect of maintaining smooth operation of the motor.

[0010] The at least one insulating member surrounds the inner wall of the shaft tube and extends axially to a bottom end and an open end of the shaft tube. Thus, the outer rings of each bearing can be tightly fitted to the at least one insulating member located on the inner wall, effectively blocking the conductive circuit.

[0011] The shaft tube has an injection molding hole that extends radially through it. This allows for easy injection molding of at least one insulating element onto the inner wall of the shaft tube.

[0012] The at least one insulating member has a protrusion with two axially opposed shoulders. There are two bearings, each abutting against one of the shoulders. Thus, the two shoulders of the protrusion provide axial positioning for the outer rings of the two bearings.

[0013] The at least one bearing is actually two bearings, namely an upper bearing and a lower bearing. A metal elastic element presses against the upper bearing. Several insulating elements are present, with one insulating element between the metal elastic element and the upper bearing. This prevents the hub, the metal elastic element, and the upper bearing from conducting current.

[0014] The shaft comprises two bearings, an upper bearing and a lower bearing. A limiting member is located between a second end of the shaft and the lower bearing. Several insulating members are present, with one insulating member positioned between the limiting member and the lower bearing. Thus, the at least one insulating member forms an insulator between the limiting member and the inner ring of the lower bearing, thereby preventing the conduction of current.

[0015] The at least one insulating member surrounds the outer wall of the shaft, and the at least one insulating member is radially aligned with the at least one bearing. This effectively blocks the current path between the at least one bearing and the shaft.

[0016] The at least one insulating element is injection molded and surrounds the outer wall of the shaft. This effectively blocks the current path between the at least one bearing and the shaft.

[0017] The shaft tube has a positioning part, which is a metal sleeve, and two axially opposite shoulders. There are two bearings: an upper bearing and a lower bearing. The outer rings of the upper and lower bearings abut against the two shoulders, and the inner rings of the upper and lower bearings are radially aligned with the at least one insulating member. This effectively blocks the current path of the metal sleeve.

[0018] The at least one insulating member extends axially from the shaft at a distance greater than or equal to the axial dimension of the at least one bearing. This ensures that the at least one insulating member reliably prevents the at least one bearing from contacting the shaft.

[0019] The shaft tube has a positioning portion protruding from its inner wall. This positioning portion has two axially opposing shoulders. At least one insulating member is isolated from both the inner wall of the shaft tube and the two shoulders of the positioning portion. Thus, the outer ring of the bearing can radially engage with the insulating member on the inner wall, and the outer ring can axially abut against the insulating member located on the two shoulders, thereby effectively blocking the conductive circuit.

[0020] The positioning part and the shaft tube are integrally formed. This allows for easy forming.

[0021] The at least one bearing is actually two bearings, namely an upper bearing and a lower bearing. The upper bearing and the lower bearing are positioned by two shoulders, and a metal sleeve is provided between the at least one insulating member located on the upper bearing and the inner wall of the shaft tube. In this way, the metal sleeve can improve the convenience of injection molding processing of the at least one insulating member.

[0022] The metal sleeve has a recess on its surface facing the at least one insulating member. This improves the adhesion between the at least one insulating member and the metal sleeve.

[0023] The shaft tube is made of insulating material. In this way, the current in the stator assembly can be blocked through the shaft tube.

[0024] The motor of this invention also includes a base, and the shaft tube and the base are integrally formed. This improves manufacturing convenience. Attached Figure Description

[0025] Figure 1 : A cross-sectional view of the first embodiment of this utility model; Figure 2 :like Figure 1 A magnified view of the local structure of A shown; Figure 3 :like Figure 1 A magnified view of the local structure of B shown; Figure 4 : A cross-sectional view of the second embodiment of this utility model; Figure 5 : A diagram showing the situation in the second embodiment of this utility model where the insulating element is located simultaneously on the inner wall of the shaft tube and the rotating shaft; Figure 6 : A cross-sectional view of the third embodiment of this utility model; Figure 7 : A diagram showing the situation in the third embodiment of this utility model where the insulating element is located simultaneously on the inner wall of the shaft tube and the rotating shaft; Figure 8 : A cross-sectional view of the fourth embodiment of this utility model; Figure 9 : A diagram showing the situation in the fourth embodiment of this utility model where the insulating element is located simultaneously on the inner wall of the shaft tube and the rotating shaft; Figure 10 : A cross-sectional view of the fifth embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures: 1: Shaft tube 1a: Bottom 1b: Open end 11: Inner wall 12: Injection molding hole 13: Positioning Department 13a: Shoulder 14: Metal sleeve 14a: Depression 2: Ball bearings 2a: Upper ball bearing 2b: Lower ball bearing 21: Outer Ring Road 22: Inner Ring Road 23: Ball bearing 3: Rotor 31: Shaft 31a: First end 31b: Second end 32: Limiting component 33: outer wall 4: Insulating components 41: Protrusion 41a: Shoulder T: Base S: Stator group S1: Iron core S2: Coil M: Motor J: Wheel hub R: Metal elastic component. Detailed Implementation

[0027] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments of this utility model are described below in detail with reference to the accompanying drawings; in addition, those symbols that are marked with the same symbols in different drawings are considered to be the same and their descriptions will be omitted.

[0028] Please refer to Figure 1 As shown, it is the first embodiment of the motor M of this utility model, including a shaft tube 1, at least one ball bearing 2, a rotor 3 and at least one insulating member 4. The outer periphery of the shaft tube 1 has a stator group S. When the current of the stator group S forms a conducting circuit in the shaft tube 1, the ball bearing 2 and the rotor 3, the insulating member 4 blocks the conducting circuit.

[0029] The shaft tube 1 can be made of metal. The shaft tube 1 can have a bottom end 1a and an open end 1b. The bottom end 1a can be used to attach to a base T. For example, the base T can be attached to the bottom end 1a by assembly, or the base T can be covered by injection molding.

[0030] At least one ball bearing 2 can be positioned within the shaft tube 1. In this embodiment, there are two ball bearings 2, which can be an upper ball bearing 2a and a lower ball bearing 2b, respectively, and the upper ball bearing 2a and the lower ball bearing 2b are spaced apart axially. Furthermore, each ball bearing 2 can have an outer ring 21 and an inner ring 22, with a plurality of balls 23 between the outer ring 21 and the inner ring 22, allowing the outer ring 21 and the inner ring 22 to rotate relative to each other through the plurality of balls 23.

[0031] The rotor 3 may have a shaft 31 located within the shaft tube 1. At least one ball bearing 2 may be located between the shaft 31 and the shaft tube 1, allowing the shaft 31 to be rotatably positioned within the shaft tube 1 via the at least one ball bearing 2. The shaft 31 may have a first end 31a and a second end 31b opposite to each other. The first end 31a may be used to engage a hub J, and the second end 31b may face the bottom end 1a. The hub J may have magnetic elements. Furthermore, the stator assembly S may have an iron core S1, around which a coil S2 may be wound. The iron core S1 may be wrapped around the shaft tube 1. Thus, the stator assembly S can generate a magnetic field by energizing it, driving the rotor 3 to rotate.

[0032] It is worth noting that when the shaft tube 1, the at least one ball bearing 2, and the rotating shaft 31 are in adjacent contact, a conductive circuit is formed. Therefore, the at least one insulating member 4 can be located between at least one set of two adjacent components, namely the shaft tube 1, the at least one ball bearing 2, or the rotating shaft 31. Furthermore, the shaft tube 1 and the rotating shaft 31 are connected via the at least one ball bearing 2. Therefore, the at least one insulating member 4 can be in contact with the at least one ball bearing 2. For example, the at least one insulating member 4 can be made of plastic or other insulating material to block the conductive circuit.

[0033] Please continue reading. Figure 1 As shown, in this embodiment, the at least one insulating member 4 can be located between the shaft tube 1 and the at least one ball bearing 2, thereby blocking the current path between the shaft tube 1 and the at least one ball bearing 2. Furthermore, the at least one insulating member 4 can be injection molded around the inner wall 11 of the shaft tube 1, and the at least one insulating member 4 can extend axially to the bottom end 1a and the open end 1b of the shaft tube 1. In addition, the shaft tube 1 can have an injection molding hole 12, which radially penetrates the shaft tube 1, and the injection molding hole 12 can be located approximately at the centerline between the bottom end 1a and the open end 1b. Thus, the at least one insulating member 4 can be easily injection molded onto the inner wall 11 of the shaft tube 1 through the injection molding hole 12. Furthermore, the inner wall 11 can, for example, have grooves or embossing to provide better friction between the at least one insulating member 4 and the inner wall 11, so that the at least one insulating member 4 can be firmly attached to the inner wall 11.

[0034] The outer ring 21 of each ball bearing 2 can be coupled to at least one insulating member 4 located on the inner wall 11. Preferably, the at least one insulating member 4 can have a protrusion 41 that protrudes into the shaft tube 1. The protrusion 41 has two shoulders 41a that are axially opposite each other. Thus, the two shoulders 41a of the protrusion 41 can provide axial positioning for the outer ring 21 of the two ball bearings 2 respectively.

[0035] Please continue reading. Figure 2 As shown, a metal elastic element R may be provided between the upper ball bearing 2a and the hub J. The metal elastic element R is used to press against the upper ball bearing 2a. Preferably, at least one insulating element 4 may be provided between the metal elastic element R and the upper ball bearing 2a to prevent current conduction between the hub J, the metal elastic element R, and the upper ball bearing 2a. Furthermore, the at least one insulating element 4 may be a ring, preferably a ring made of Mylar material. The at least one insulating element 4 is arranged around the shaft 31 so that the at least one insulating element 4 can abut against the metal elastic element R and the inner ring 22 of the upper ball bearing 2a respectively, thereby blocking current conduction.

[0036] Please continue reading. Figure 3 As shown, the rotating shaft 31 may have a limiting member 32, which may be made of metal and may be a C-shaped fastening ring or a fastening piece. The limiting member 32 may be located between the second end 31b of the rotating shaft 31 and the lower ball bearing 2b. The limiting member 32 may abut against the lower ball bearing 2b to prevent the rotating shaft 31 from axially disengaging. Preferably, at least one insulating member 4 may be provided between the limiting member 32 and the lower ball bearing 2b. The at least one insulating member 4 may be made of Mylar material to prevent current conduction between the rotating shaft 31, the limiting member 32, and the lower ball bearing 2b. Furthermore, the at least one insulating member 4 may be a ring plate, which is arranged around the rotating shaft 31 so that the at least one insulating member 4 can form an isolation between the limiting member 32 and the inner ring 22 of the lower ball bearing 2b, thereby blocking current conduction.

[0037] Please refer to Figure 4 , Figure 5As shown, this is the second embodiment of the motor of this utility model. Compared with the first embodiment, in this embodiment, at least one ball bearing 2 can be positioned on the shaft tube 1. For example, the shaft tube 1 can have a positioning part 13, which can protrude from the inner wall 11 of the shaft tube 1. For example, the positioning part 13 can be a metal sleeve. The positioning part 13 can be connected to the inner wall 11 of the shaft tube 1 by means of tight fitting, welding or gluing. The positioning part 13 can have two shoulders 13a, which are axially opposite each other. The outer ring 21 of each ball bearing 2 can be radially connected to the inner wall 11, and the outer ring 21 can axially abut against the two shoulders 13a. Furthermore, when there are several insulating members 4, they can be located simultaneously on the inner wall 11 of the shaft tube 1 and on the outer wall 33 of the rotating shaft 31 (e.g., Figure 5 ).

[0038] The at least one insulating member 4 can be located between the at least one ball bearing 2 and the shaft 31, thereby blocking the current path between the at least one ball bearing 2 and the shaft 31. The at least one insulating member 4 can be injection molded around the outer wall 33 of the shaft 31 so that the at least one insulating member 4 can be radially aligned with the at least one bearing 2. In addition, the outer wall 33 can, for example, have grooves or embossing to provide better friction between the at least one insulating member 4 and the outer wall 33, so that the at least one insulating member 4 can be firmly attached to the outer wall 33. Preferably, the axial extension distance of the at least one insulating member 4 on the shaft 31 can be greater than or equal to the axial dimension of the at least one ball bearing 2, so that the at least one insulating member 4 can reliably prevent the at least one ball bearing 2 from contacting the shaft 31.

[0039] Please refer to Figure 6 , Figure 7 As shown, this is the third embodiment of the motor of this utility model. Compared with the first embodiment, in this embodiment, the shaft tube 1 may have the positioning part 13, which may be integrally formed with the inner wall 11 of the shaft tube 1. The at least one insulating member 4 may be located on the inner wall 11 of the shaft tube 1 and the two shoulders 13a of the positioning part 13. Thus, the outer ring 21 of each ball bearing 2 may be radially connected to the insulating member 4 on the inner wall 11, and the outer ring 21 may be axially abutted against the insulating member 4 located on the two shoulders 13a, thereby blocking the conduction circuit.

[0040] Please refer to Figure 8 , Figure 9As shown, this is the fourth embodiment of the motor of this utility model. Compared with the third embodiment, this embodiment may have an additional metal sleeve 14 between the at least one insulating member 4 and the inner wall 11 of the shaft tube 1. In this embodiment, the metal sleeve 14 is positioned opposite the upper ball bearing 2a, allowing the at least one insulating member 4 to be attached to the metal sleeve 14 and the shoulder 13a for positioning the upper ball bearing 2a. Preferably, the surface of the metal sleeve 14 facing the at least one insulating member 4 may have a recess 14a, which can be a groove or embossed, to improve the adhesion between the at least one insulating member 4 and the metal sleeve 14. Thus, the metal sleeve 14 can improve the convenience of injection molding processing of the at least one insulating member 4.

[0041] Please refer to Figure 10 As shown, this is the fifth embodiment of the motor of this utility model. In this embodiment, the shaft tube 1 can be made of insulating material such as plastic, so as to block the current of the stator assembly S through the shaft tube 1. Furthermore, the shaft tube 1 and the base T can be integrally molded by injection molding, which can improve the convenience of manufacturing.

[0042] It is worth mentioning that when there are multiple insulating elements 4, in the aforementioned third and fourth embodiments, the at least one insulating element 4 can also be located on the outer wall 33 of the rotating shaft 31, as in the aforementioned second embodiment (e.g., Figure 7 , Figure 9 Furthermore, in the aforementioned first to fifth embodiments, at least one insulating member 4 may be present between the metal elastic member R and the upper ball bearing 2a, and at least one insulating member 4 may be present between the limiting member 32 and the inner ring 22 of the lower ball bearing 2b. These members may be used individually or in combination as needed, and are not limited to the forms disclosed in the drawings of each embodiment.

[0043] In summary, the motor of this utility model, in which at least one bearing forms contact with the shaft tube and / or the rotating shaft through the at least one insulating member, can block the current of the stator assembly from forming a conductive circuit with the rotating shaft, thereby avoiding the formation of a conductive circuit, eliminating bearing electrolytic corrosion, and achieving the effect of maintaining smooth operation of the motor.

[0044] Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the present invention. Any modifications and alterations made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall include all changes within the meaning and equivalent scope of the appended claims. Furthermore, when the above embodiments can be combined, the present invention includes any combination of embodiments.

Claims

1. A motor, characterized in that, include: A shaft tube having a stator assembly on its outer periphery; At least one bearing is located inside the shaft tube; A rotor having a shaft rotatably located within a shaft tube via the at least one bearing; and At least one insulating element, the at least one insulating element being located between the shaft tube and the at least one bearing, and / or the at least one insulating element being located between the at least one bearing and the rotating shaft.

2. The motor as described in claim 1, characterized in that, The at least one insulating element surrounds the inner wall of the shaft tube, and the at least one insulating element extends axially to a bottom end and an open end of the shaft tube.

3. The motor as described in claim 2, characterized in that, The shaft tube has an injection molding hole that extends radially through the shaft tube.

4. The motor as described in claim 2, characterized in that, The at least one insulating element has a protrusion with two axially opposed shoulders, and the at least one bearing consists of two bearings, each bearing abutting against the two shoulders.

5. The motor as described in claim 1, characterized in that, The at least one bearing is two, namely an upper bearing and a lower bearing, a metal elastic element presses against the upper bearing, and there are several insulating elements, with one insulating element between the metal elastic element and the upper bearing.

6. The motor as claimed in claim 1, characterized in that, The bearing is two, namely an upper bearing and a lower bearing. The shaft has a limiting member located between a second end of the shaft and the lower bearing. There are several insulating members, with one insulating member between the limiting member and the lower bearing.

7. The motor as claimed in claim 1, characterized in that, The at least one insulating element surrounds the outer wall of the shaft, and the at least one insulating element is radially aligned with the at least one bearing.

8. The motor as claimed in claim 7, characterized in that, The at least one insulating element is injection molded around the outer wall of the shaft.

9. The motor as claimed in claim 7, characterized in that, The shaft tube has a positioning part, which is a metal sleeve. The positioning part has two shoulders that are axially opposite each other. There are two bearings, namely an upper bearing and a lower bearing. The outer rings of the upper bearing and the lower bearing respectively abut against the two shoulders. The inner rings of the upper bearing and the lower bearing are respectively radially aligned with the at least one insulating member.

10. The motor as claimed in claim 7, characterized in that, The axial extension distance of the at least one insulating element on the shaft is greater than or equal to the axial dimension of the at least one bearing.

11. The motor as claimed in claim 1, characterized in that, The shaft tube has a positioning part that protrudes from the inner wall of the shaft tube and has two axially opposite shoulders. The at least one insulating member is isolated from the inner wall of the shaft tube and the two shoulders of the positioning part.

12. The motor as claimed in claim 11, characterized in that, The positioning part is integrally formed with the shaft tube.

13. The motor as claimed in claim 11, characterized in that, The at least one bearing is two, namely an upper bearing and a lower bearing. The upper bearing and the lower bearing are respectively positioned by two shoulders. A metal sleeve is provided between the at least one insulating member located on the upper bearing and the inner wall of the shaft tube.

14. The motor as claimed in claim 13, characterized in that, The surface of the metal sleeve facing the at least one insulating element has a recess.

15. The motor as claimed in claim 1, characterized in that, It also includes a base, and the shaft tube and the base are integrally formed.

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