Brushless motor of draw-bar box

Abstract

The utility model provides a brushless motor for a draw-bar box. The brushless motor comprises a motor rotating shaft, an inner stator, an outer rotor and a fixed bracket, the roller device comprises a driving wheel and a driven wheel, the driven wheel is axially positioned at the right end of the motor shaft through a positioning bearing, and the driving wheel is fixed on the outer peripheral surface of the outer rotor at the left end of the motor shaft; the peripheral surface of the outer sleeve is fixedly connected with the bottom of the draw-bar box. According to the utility model, the structural layout is reasonable, the layout of the outer rotor motor is utilized, the motor and the roller device are combined, the driving wheel is integrated on the outer rotor, the driven wheel is integrated at the other end of the motor rotating shaft, and the rolling shaft connecting the driving wheel and the driven wheel is replaced by the motor rotating shaft; the fixing support of the outer rotor motor is used as the positioning center of the bottom of the draw-bar box, and the roller device is connected with the draw-bar box through the fixing support, so that a driving motor does not need to be additionally designed on the draw-bar box body, the internal storage space of the draw-bar box does not need to be occupied, and the space utilization rate of the draw-bar box is improved.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a brushless motor for a trolley case. Background Technology

[0002] A rolling suitcase is a type of luggage with a pull handle and wheels, and it's a common storage tool for daily life and travel. Available rolling suitcases typically come in various sizes and specifications; when choosing one, you need to weigh your needs and budget.

[0003] With technological advancements, rolling suitcases have undergone continuous redesign. Electric rolling suitcases are an innovative product that combines an electric drive system with the functions of a traditional rolling suitcase, eliminating the hassle of dragging a traditional one and providing travelers with a more convenient and efficient travel experience. Existing electric rolling suitcases typically have built-in batteries, motors, and other components. The motor and the rolling wheels are usually separate structures; the motor's output is connected to the wheels via a transmission mechanism, driving the wheels to rotate. Because space needs to be allocated for the battery and motor, the storage space of electric rolling suitcases may be somewhat limited.

[0004] CN202411504490.9 discloses an electric suitcase, including a suitcase body, a drive assembly, and a handle assembly. The drive assembly includes a wheel set mounted on the bottom, a lateral telescopic rod disposed above the wheel set and extending out of the through groove, a drive component for driving the lateral telescopic rod to extend and retract, a first control component electrically connected to the drive component, and a power supply electrically connected to the first control component. The wheel set and the control structure are designed separately, requiring installation space on the suitcase body for the control structure. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a brushless motor for a trolley case, which can effectively combine the motor with the roller, facilitate the rational arrangement of the internal space of the trolley case, reduce the occupation of the internal storage space of the trolley case by the motor structure, and help improve the space utilization rate.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a brushless motor for a trolley case, located at the roller device at the bottom of the trolley case, includes a motor shaft, an inner stator, an outer rotor, and a fixed bracket; the fixed bracket includes an end cap, an inner sleeve, and an outer sleeve, the outer sleeve being fitted over the inner sleeve, and the right ends of the inner sleeve and the outer sleeve being connected and fixed through the end cap; the inner stator is fixed to the outer wall of the inner sleeve, and an outer rotor rotating relative to the inner stator is provided outside the inner stator, and the outer rotor is located in the space between the outer sleeve and the inner sleeve; the motor shaft rotates and is located through the inner sleeve axis, the inner circumferential surface of the left end of the outer rotor is fixedly set with the shaft, the roller device includes a driving wheel and a driven wheel, the driven wheel is axially positioned at the right end of the motor shaft through a positioning bearing, and the driving wheel is fixed on the outer circumferential surface of the outer rotor at the left end of the motor shaft; the outer circumferential surface of the outer sleeve is fixedly connected to the bottom of the trolley case.

[0007] In the above solution, the driving wheel of the roller device is cleverly integrated onto the outer rotor, while the driven wheel is integrated onto the other end of the motor shaft. The rolling shaft connecting the driving and driven wheels is replaced by the motor shaft. The fixed bracket of the outer rotor motor serves as the positioning center at the bottom of the suitcase, and the connection between the roller device and the suitcase is completed by the fixed bracket. This effectively utilizes the structural characteristics of the outer rotor motor, with the stationary inner stator and fixed bracket serving as the positioning center. The rotating motor shaft and outer rotor are integrated with the driving and driven wheels respectively, and the motor is directly integrated at the location of the roller device. This results in a more compact and rational motor layout, saving space inside the suitcase and improving space utilization efficiency.

[0008] Furthermore, the bottom of the suitcase body has a connecting seat, and the outer peripheral surface of the outer sleeve of the fixed bracket has a protruding connecting part that cooperates with and is fixed to the connecting seat.

[0009] Furthermore, at the location corresponding to the protruding connecting part of the outer sleeve, an auxiliary reinforcing rib is provided, which is a U-shaped bent piece. The auxiliary reinforcing rib supports and connects the outer sleeve and the protruding connecting part, which can effectively improve the support strength of the protruding connecting part and provide further protection for its connection and support with the suitcase body.

[0010] Preferably, the U-shaped bending component is integrally formed above the fixed bracket, the opening of the U-shaped bending component faces the protruding connecting part and is connected to the outer surface of the protruding connecting part, and the upper surface of the U-shaped bending component and the connecting end of the protruding connecting part is located below the lower surface of the connecting seat, so that the U-shaped bending component does not interfere with the connecting seat.

[0011] Furthermore, the distance between the protruding connecting part and the driving wheel is greater than the distance between it and the driven wheel. That is, the protruding connecting part is designed to be biased towards the driven wheel relative to both the driving and driven wheels. The right end face of the outer sleeve protrudes outward around the shaft with a reinforcing flange, while the left end face of the driven wheel has an annular groove designed to conform to the surface of the reinforcing flange. The reinforcing flange and the annular groove surface do not contact or interfere with each other. For the protruding connecting part designed to be biased towards the driven wheel, the conformal fit between the reinforcing flange and the annular groove further improves the support strength of the fixed bracket on the driven wheel side.

[0012] To facilitate the axial positioning of the inner sleeve and the motor shaft, the inner walls at both ends of the inner sleeve are recessed to form mounting cavities. A rotating bearing is provided in the mounting cavity. The inner wall of the rotating bearing is rotatably connected to the motor shaft, and the outer wall is rotatably connected to the inner wall of the inner sleeve.

[0013] To facilitate the axial positioning of the driven wheel and the motor shaft, the inner walls at both ends of the driven wheel are respectively recessed with positioning cavities. Positioning bearings are provided in the positioning cavities. The inner wall of the positioning bearings mates with the outer circumferential surface of the motor shaft, and the inner circumferential surface mates with the inner wall of the driven wheel.

[0014] The beneficial effects of this utility model are that it provides a brushless motor for a suitcase with a reasonable structural layout. It utilizes the layout of an external rotor motor to combine the motor with the roller device. The driving wheel is integrated on the external rotor, and the driven wheel is integrated on the other end of the motor shaft. The rolling shaft connecting the driving wheel and the driven wheel is replaced by the motor shaft. The fixed bracket of the external rotor motor serves as the positioning center of the bottom of the suitcase. The connection between the roller device and the suitcase is completed by the fixed bracket. This eliminates the need to design a separate drive motor on the suitcase body and avoids occupying the internal storage space of the suitcase, thus improving the space utilization rate of the suitcase. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a perspective view of the present invention.

[0017] Figure 2 This is a top view of the present invention.

[0018] Figure 3 yes Figure 2 Sectional view of AA.

[0019] In the figure: 1. Connecting seat; 2. Motor shaft; 3. Inner stator; 4. Outer rotor; 5. Fixed bracket; 51. Inner sleeve; 511. Rotating bearing; 52. Outer sleeve; 521. Protruding connecting part; 522. Auxiliary reinforcing rib; 53. End cover; 531. Reinforcing flange; 6. Driving wheel; 7. Driven wheel; 71. Positioning bearing; 72. Annular groove. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0021] Example 1:

[0022] like Figures 1 to 3 The brushless motor shown is an embodiment of this utility model. The brushless motor is located at the roller assembly at the bottom of the suitcase. The brushless motor uses an external rotor 4 and includes a motor shaft 2, an inner stator 3, an outer rotor 4, and a fixed bracket 5. The fixed bracket 5 is used for support and positioning. The inner stator 3 is positioned relative to the fixed bracket 5. The motor shaft 2 rotates relative to the fixed bracket 5. The outer rotor 4 cooperates with the motor shaft 2 and rotates relative to the inner stator 3 as the motor shaft 2 rotates.

[0023] Specifically, such as Figure 3 As shown, the fixed bracket 5 includes an integral end cap 53, an inner sleeve 51, and an outer sleeve 52. The outer sleeve 52, the inner sleeve 51, and the motor shaft 2 are coaxially arranged. The outer sleeve 52 is fitted over the inner sleeve 51, and the right ends of the inner sleeve 51 and the outer sleeve 52 are connected and fixed through the end cap 53. The inner stator 3 is fixed to the outer wall of the inner sleeve 51, and an outer rotor 4 is provided outside the inner stator 3, rotating relative to the inner stator 3. The outer rotor 4 is located in the space between the outer sleeve 52 and the inner sleeve 51. The motor shaft 2 rotates and is disposed at the axis position of the inner sleeve. The inner walls at both ends of the inner sleeve 51 are recessed to form mounting cavities, and rotating bearings 511 are provided in the mounting cavities. The inner wall of the rotating bearing 511 is rotatably connected to the motor shaft 2, and the outer wall is rotatably connected to the inner wall of the inner sleeve 51. The inner circumferential surface of the left end of the outer rotor 4 is positioned with an interference fit to the motor shaft 2.

[0024] The roller assembly includes a driving roller 6 and a driven roller 7. The driving roller 6 is fixed to the outer circumferential surface of the outer rotor 4 at the left end of the motor shaft. The driven roller 7 is axially positioned at the right end of the motor shaft 2 via a positioning bearing 71. The inner walls at both ends of the driven roller 7 are respectively recessed with positioning cavities, and positioning bearings 71 are installed in the positioning cavities. The inner wall of the positioning bearing 71 mates with the outer circumferential surface of the motor shaft 2, and the inner circumferential surface mates with the inner wall of the driven roller 7.

[0025] When the motor shaft 2 rotates, it synchronously drives the outer rotor 4 and the drive wheel 6 to rotate. The driven wheel 7 rotates under the action of the positioning bearing 71. At this time, the drive wheel 6 and the driven wheel 7 at both ends of the motor shaft 2 are in balance and roll relative to the ground, driving the luggage box body above the outer sleeve 52 to move.

[0026] This brushless motor for a rolling suitcase features a rational structural layout. It utilizes the external rotor 4 motor's design, combining the motor with the roller assembly. Taking advantage of the external rotor 4 motor's structural characteristics, the stationary inner stator 3 and fixed bracket 5 serve as the positioning center. The rotating motor shaft 2 and external rotor 4 integrate the driving wheel 6 and driven wheel 7, respectively. The rolling shaft connecting the driving wheel 6 and driven wheel 7 is replaced by the motor shaft 2. The fixed bracket 5, the positioning center of the external rotor 4 motor at the bottom of the rolling suitcase, completes the connection between the roller assembly and the rolling suitcase. Integrating the motor driving the rollers into the roller assembly eliminates the need for a separate drive motor on the suitcase body, saving internal storage space and improving the suitcase's space utilization.

[0027] Example 2:

[0028] like Figures 1 to 3 The brushless motor shown is a second embodiment of this utility model.

[0029] Based on Example 1, Example 2 further designs a positioning connection structure between the trolley case body and the outer sleeve 52 when the brushless motor of the trolley case is connected to the trolley case body.

[0030] Specifically, a connecting seat 1 is provided at the bottom of the suitcase body. The outer circumferential surface of the outer sleeve 52 of the fixing bracket 5 protrudes with a protruding connecting part 521 that cooperates and is fixed with the connecting seat 1. In actual design, the protruding connecting part 521 and the connecting seat 1 can be designed to rotate, so that the roller device can rotate in different directions relative to the suitcase body.

[0031] At the location corresponding to the protruding connecting part 521, the outer sleeve 52 is provided with an auxiliary reinforcing rib 522, which is a U-shaped bent piece. The U-shaped bent piece is integrally formed above the fixed bracket 5, with its opening facing the protruding connecting part 521 and connected to the outer surface of the protruding connecting part 521. The upper surface of the U-shaped bent piece connecting to the protruding connecting part 521 is located below the lower surface of the connecting seat 1, and the U-shaped bent piece does not interfere with the connecting seat 1. The auxiliary reinforcing rib 522 supports and connects the outer sleeve 52 and the protruding connecting part 521, which can effectively improve the support strength of the protruding connecting part 521 and provide further protection for its connection support with the suitcase body.

[0032] Example 3:

[0033] like Figures 1 to 3 The brushless motor for a suitcase shown is a third embodiment of this utility model.

[0034] Based on Example 2, Example 3 further optimizes the position of the protruding connecting part 521.

[0035] Specifically, the distance between the protruding connecting part 521 and the driving wheel 6 is greater than the distance between it and the driven wheel 7. That is, the protruding connecting part 521 is designed to be biased towards the driven wheel 7 relative to the driving wheel 6 and the driven wheel 7. To accommodate this bias, the right end face of the outer sleeve 52 protrudes outward around the shaft with a reinforcing flange 531, and the left end face of the driven wheel 7 has an annular groove 72 that is contoured to the surface of the reinforcing flange 531. The reinforcing flange 531 and the annular groove 72 do not contact or interfere with each other. By utilizing the contoured fit between the reinforcing flange 531 and the annular groove 72, the support strength of the fixed bracket 5 on the driven wheel 7 side can be further improved. When the roller device is symmetrically designed at the bottom of the trolley case relative to the case body, the driving wheel 6 can be located on the inner side and the driven wheel 7 on the outer side. This can more effectively protect the driving wheel 6, that is, protect the outer rotor 4 of the outer rotor 4 motor and the motor shaft 2, thereby ensuring the service life and reliability of the trolley case.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A trolley case brushless motor provided at a trolley device at a bottom of the trolley case, characterized in that: The motor shaft, the inner stator, the outer rotor and the fixed support are included. The fixed support includes an end cover part, an inner sleeve and an outer sleeve. The inner stator is fixed to the outer wall of the inner sleeve. The motor shaft is rotatable and penetrates the inner sleeve at the axial position. The outer rotor is rotatable relative to the inner stator.

2. The trolley case brushless motor of claim 1, wherein: The outer sleeve is fixedly connected to the bottom of the pull rod box.

3. The draw-bar suitcase brushless motor of claim 2, wherein: The outer sleeve of the fixed support has a protruding connecting part which is fixed to the connecting seat.

4. The draw-bar suitcase brushless motor of claim 3, wherein: The outer sleeve has an auxiliary reinforcing rib.

5. The draw-bar suitcase brushless motor of claim 2, wherein: The U-shaped bending part is integrally formed above the fixed support.

6. The draw- handle case brushless motor of claim 1, wherein: The U-shaped bending part is connected to the outer surface of the protruding connecting part.

7. The draw- handle case brushless motor of claim 1, wherein: The distance between the protruding connecting part and the driving wheel is greater than the distance between the protruding connecting part and the driven wheel. The outer sleeve has a reinforcing flange. The driven wheel has an annular groove which is designed to be shaped with the surface of the reinforcing flange. The inner sleeve has two installation cavities. The driven wheel has two positioning cavities.

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