Hub motor

Abstract

The utility model discloses a wheel hub motor, which comprises a shell, a motor and a speed reduction unit, the shell is rotatably arranged on a first mandrel and a second mandrel, and the motor is arranged in the shell and is provided with a stator and a rotor. The speed reduction unit is arranged in the shell and is provided with a gear shaft connected with the rotor, a fixed bracket connected with the stator, a movable bracket arranged between the gear shaft and the second mandrel, a first ring gear arranged on the fixed bracket, a second ring gear arranged on the shell, and a plurality of first planetary gears pivoted on the movable bracket and meshed with the gear shaft and the first ring gear; and the second planetary gears are pivoted on the second mandrel and meshed with the movable bracket and the second ring gear, and a hollow pipe penetrates through the first mandrel, the gear shaft, the movable bracket and the second mandrel, so that the waterproof and dustproof effects of the hub motor can be improved.

Description

Technical Field

[0001] The utility model relates to a wheel hub motor, in particular to a wheel hub motor capable of improving waterproof and dustproof effects. Background Art

[0002] Traditional electric-assisted bicycles obtain forward momentum through the rider's pedaling force combined with the assistance provided by a power output mechanism (such as a hub motor), so that electric-assisted bicycles do not impose too much burden on the rider's physical strength and can achieve the effect of fitness while relaxing.

[0003] The rear wheel power output mechanism disclosed in the Chinese patent case TW M621354 first performs the first stage reduction in operation by the first planetary gear, then the second planetary bracket outputs the power to the second planetary gear, then the second planetary gear performs the second stage reduction, and finally the output end of the housing outputs the power after the two-stage reduction. However, in the aforementioned patent case, since the first spindle, the gear shaft and the second spindle are all hollow structures and are not connected to each other, foreign matter (such as water or dust) can easily enter the position of the internal parts (such as the motor or the reduction mechanism) from the gap between the two, thereby adversely affecting the service life of the aforementioned internal parts. Utility Model Content

[0004] The main purpose of the utility model is to provide a hub motor, which can improve the waterproof and dustproof effects to extend the service life.

[0005] In order to achieve the above main purpose, the hub motor of the utility model includes a housing, a motor, a first spindle, a second spindle, a speed reduction mechanism, and a hollow pipe. The outer shell has a non-output end and an output end; the motor is arranged in the outer shell and has a stator and a rotor that can rotate relative to the stator; the first spindle is arranged at the non-output end of the outer shell and allows the outer shell to rotate relative to it, one end of the first spindle is passed through the outer shell and fixedly connected to the stator of the motor, and the first spindle has a first axial hole that passes through the two ends; the second spindle is arranged at the output end of the outer shell and allows the outer shell to rotate relative to it, and the second spindle has a second axial hole that passes through the two ends; the reduction mechanism is arranged in the outer shell and has a gear shaft, a fixed bracket, a movable bracket, a first ring gear, a second ring gear, a plurality of first planetary gears, and a plurality of second planetary gears, wherein the gear shaft is connected to the rotor of the motor and is located between the first spindle and the second spindle; the gear shaft has a third axial hole that is coaxially connected to the first axial hole and the second axial hole; the fixed bracket is fixed to the stator of the motor; the movable bracket can rotate The gear wheel is a gear wheel that is fixed to the outer shell and has a first gear that is fixed to the outer shell and a second gear that is fixed to the outer shell. The gear wheel is a gear wheel that is fixed to the outer shell and has a first gear that is fixed to the outer shell and a second gear that is fixed to the outer shell. The first gear wheels are fixed to the outer shell and have a first gear that is fixed to the outer shell and has a first gear that is fixed to the outer shell. The first gear wheels are fixed to the outer shell and have a first gear that is fixed to the outer shell and has a first gear that is fixed to the outer shell. The first gear wheels are fixed to the outer shell and have a first gear that is fixed to the outer shell and has a second gear that is fixed to the outer shell.

[0006] From the above, it can be seen that the hub motor of the utility model utilizes the hollow tube to eliminate the gap between the first spindle and the gear shaft, the gap between the gear shaft and the movable bracket, and the gap between the movable bracket and the second spindle, thereby effectively preventing foreign matter (such as water or dust) from entering the interior of the housing through the above gaps, thereby improving the service life of the overall structure.

[0007] Preferably, the first spindle further has a first inner flange, which radially protrudes from the hole wall of the first axial hole, and one end of the hollow tube abuts against the first inner flange to keep the hollow tube in position.

[0008] Preferably, the second spindle further has a second inner flange, which radially protrudes from the hole wall of the second axial hole, and one end of the hollow tube abuts against the second inner flange to keep the hollow tube in position.

[0009] Preferably, the second spindle further has an annular groove adjacent to the second inner flange, a sealing ring is arranged in the annular groove, and the sealing ring abuts against the outer peripheral surface of the hollow pipe to enhance the sealing effect between the two.

[0010] The detailed structure, features, assembly or use of the hub motor provided by the present invention for improving the waterproof and dustproof effect will be described in the detailed description of the implementation method later. However, those skilled in the art should understand that the detailed description and the specific embodiments listed for implementing the present invention are only used to illustrate the present invention, and are not used to limit the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional diagram of the hub motor of the present invention.

[0012] Figure 2 It is a stereoscopic diagram of the hub motor of the present invention from another perspective.

[0013] Figure 3 This is an exploded view of the hub motor of the present invention.

[0014] Figure 4 It is a cross-sectional view of the hub motor of the present utility model.

[0015] Description of reference numerals:

[0016] 10: Wheel hub motor;

[0017] 20: Shell;

[0018] 21: Shell;

[0019] 22: end cap;

[0020] 23: Accommodation space;

[0021] 24: non-output terminal;

[0022] 25: output terminal;

[0023] 26: first pin groove;

[0024] 30: Motor;

[0025] 32: stator;

[0026] 34: rotor;

[0027] 342: concave part;

[0028] 40: first spindle;

[0029] 42: first shaft portion;

[0030] 44: Wing;

[0031] 46: first axis hole;

[0032] 48: first inner flange;

[0033] B1: first bearing;

[0034] S1: screw;

[0035] 50: second spindle;

[0036] 52: disc;

[0037] 54: second shaft portion;

[0038] 56: second shaft hole;

[0039] 57: second inner flange;

[0040] 58: ring groove;

[0041] B2: second bearing;

[0042] 60: speed reduction mechanism;

[0043] 61: gear shaft;

[0044] 612: third shaft portion;

[0045] 614: ring gear portion;

[0046] 616: third axis hole;

[0047] 62: fixed bracket;

[0048] S2: screw;

[0049] S3: Screw

[0050] 63: movable bracket;

[0051] 632: Ring;

[0052] 634: tooth;

[0053] 636: fourth axis hole;

[0054] 64: first ring gear;

[0055] 642: convex part;

[0056] 65: second ring gear;

[0057] 652: second pin groove;

[0058] 66: first planetary gear;

[0059] 662: First axle;

[0060] 67: Second planetary gear;

[0061] 672: Second axle;

[0062] 70: Hollow pipe fittings

[0063] 72: sealing ring;

[0064] 80: ratchet socket;

[0065] P: Pin. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0067] First, it is explained that throughout the entire specification, including the embodiments described below and the claims, the terms related to directions are based on the directions in the drawings. Secondly, in the embodiments and drawings to be described below, the same component numbers represent the same or similar components or their structural features.

[0068] See also Figure 1 and Figure 2 The hub motor 10 of the present invention includes a housing 20 , a motor 30 , a first spindle 40 , a second spindle 50 , a speed reduction mechanism 60 , and a hollow pipe 70 .

[0069] The housing 20 includes a shell 21 and an end cover 22. The end cover 22 is disposed at the right end opening of the shell 21 and forms a receiving space 23 between the shell 21 and the shell 21 for accommodating most of the aforementioned components. In addition, the shell 21 has a non-output end 24 (such as Figure 2 As shown, the end cap 22 has an output end 25 (as Figure 1 as shown).

[0070] The motor 30 is disposed in the housing 20 and has a stator 32 and a rotor 34 that rotates relative to the stator 32. The rotor 34 rotates to output electric assist through power provided by a power supply (such as a battery installed on the frame, not shown).

[0071] The first spindle 40 has a first shaft portion 42 and three wing portions 44. The three wing portions 44 are connected to the outer circumference of the first shaft portion 42. The first spindle 40 is assembled at the non-output end 24 of the housing 20 and a first bearing B1 (such as Figure 4 ), so that the housing 20 can rotate relative to the first spindle 40. More specifically, one end of the first shaft portion 42 protrudes from the housing 20 to be assembled and fixed with the rear fork (not shown in the figure), and the other end of the first shaft portion 42 penetrates into the accommodating space 23 and uses a plurality of screws S1 to fix the three-wing portion 44 to the stator 32 of the motor 30, so that the first spindle 40 remains stationary. In addition, as Figure 4 As shown, the first spindle 40 further has a first shaft hole 46 and a first inner flange 48 . The first shaft hole 46 passes through two ends of the first shaft portion 42 , and the first inner flange 48 radially protrudes from the hole wall of the first shaft hole 46 .

[0072] The second spindle 50 has a disk portion 52, a second shaft portion 54 connected to the disk portion 52, and a second shaft hole 56 penetrating the disk portion 52 and the second shaft portion 54. The second spindle 50 is assembled at the output end 25 of the housing 20 and a second bearing B2 (such as Figure 4 As shown in FIG. 5 ), the housing 20 can rotate relative to the second spindle 50. Figure 4 As shown, the second shaft portion 54 protrudes from the housing 20, and in addition to being used for assembly and fixing with the rear fork (not shown in the figure), a ratchet sleeve 80 for assembly with the large toothed plate (not shown in the figure) is also sleeved. In addition, the second shaft portion 54 also has a second inner flange 57 and an annular groove 58 adjacent to the second inner flange 57, wherein the second inner flange 57 radially protrudes from the hole wall of the second shaft hole 56.

[0073] The speed reduction mechanism 60 is used to reduce the speed of the electric assist force generated by the rotor 34 before transmitting it out. Figure 3 and Figure 4 As shown, the speed reduction mechanism 60 is disposed in the housing 20 and has a gear shaft 61, a fixed bracket 62, a movable bracket 63, a first ring gear 64, a second ring gear 65, a plurality of first planetary gears 66, and a plurality of second planetary gears 67, wherein:

[0074] The gear shaft 61 has a third shaft portion 612, a ring gear portion 614 connected to the third shaft portion 612, and a third shaft hole 616 penetrating the third shaft portion 612 and the first ring gear portion 614. Figure 4 As shown, the gear shaft 61 is coaxially arranged between the first spindle 40 and the second spindle 50, and the third shaft portion 612 of the gear shaft 61 is assembled to the rotor 34 in a tight fit manner and two third bearings B3 are arranged between the stator 32, so that the gear shaft 61 can be driven by the rotor 34 to rotate relative to the stator.

[0075] The fixing bracket 62 is fixed to the disk portion 52 of the second spindle 50 by a plurality of screws S2 , and is fixed to the stator 32 of the motor 30 by a plurality of screws S3 , so that both the fixing bracket 62 and the second spindle 50 remain stationary.

[0076] The movable bracket 63 has a ring portion 632, a tooth portion 634 connected to the ring portion 632, and a fourth shaft hole 636 penetrating the ring portion 632 and the tooth portion 634. Figure 4 As shown, the movable bracket 63 is disposed between the gear shaft 61 and the second spindle 50 and is provided with a fourth bearing B4 on the disk portion 52 of the second spindle 50 , so that the movable bracket 63 can rotate relative to the second spindle 50 .

[0077] The first ring gear 64 is disposed between the motor 30 and the fixing bracket 62. The outer surface of the first ring gear 64 has a plurality of protrusions 642, and the first ring gear 64 is engaged with the plurality of recesses 342 of the stator 32 by the protrusions 642, so that the first ring gear 64 remains stationary.

[0078] The outer ring surface of the second ring gear 65 has a plurality of second pin grooves 652, and the inner ring surface of the end cover 22 has a plurality of first pin grooves 26 (such as Figure 4 As shown in FIG. 1 ), a plurality of pins P are engaged between the first pin grooves 26 and the second pin grooves 652 so that the second ring gear 65 and the housing 20 can move synchronously.

[0079] The number of the first planetary gears 66 in this embodiment is three, but not limited thereto. The first planetary gears 66 are meshed between the ring gear portion 614 of the gear shaft 61 and the first ring gear 64 and are respectively pivoted to the ring portion 632 of the movable bracket 63 by a first wheel shaft 662. Thus, when the first planetary gears 66 are driven by the gear shaft 61, since the first ring gear 64 remains stationary, the first planetary gears 66 will rotate while revolving around the gear shaft 61 along the first ring gear 64, and drive the movable bracket 63 to rotate together during the revolving process.

[0080] The number of the second planetary gears 67 in this embodiment is four, but not limited thereto. The second planetary gears 67 are meshed between the toothed portion 634 of the movable bracket 63 and the second ring gear 65 and are pivoted to the disk portion 52 of the second spindle 50 by a second wheel shaft 672. Thus, when the second planetary gears 67 are driven by the toothed portion 634 of the movable bracket 63, the second planetary gears 67 rotate in place and push the second ring gear 65 to rotate during the rotation, thereby causing the second ring gear 65 to drive the housing 20 to rotate relative to the first spindle 40 and the second spindle 50.

[0081] The hollow tube 70 is made of metal in this embodiment, but is not limited thereto. Figure 3 and Figure 4As shown, the hollow pipe 70 is inserted into the first shaft hole 46 of the first spindle 40, the second shaft hole 56 of the second spindle 50, the third shaft hole 616 of the gear shaft 61, and the fourth shaft hole 636 of the movable bracket 63. One end of the hollow pipe 70 abuts against the first inner flange 48 of the first spindle 40, and the other end of the hollow pipe 70 abuts against the second inner flange 57 of the second spindle 50, so that the hollow pipe 70 is kept in position. In addition, the outer peripheral surface of the hollow pipe 70 abuts against a sealing ring 72 provided in the annular groove 58, and the sealing ring 72 improves the sealing effect between the hollow pipe 70 and the second spindle 50.

[0082] In actual operation, the hub motor 10 of the present invention first performs the first stage reduction by the first planetary gear 66, then the movable bracket 63 outputs the power to the second planetary gear 67, and then the second planetary gear 67 performs the second stage reduction, and finally the output end 25 of the housing 20 completes the power output after the second stage reduction. During the operation process, the hub motor 10 of the present invention uses the hollow pipe 70 to eliminate the gap between the first spindle 40 and the gear shaft 61, the gap between the gear shaft 61 and the movable bracket 63, and the gap between the movable bracket 63 and the second spindle 50, thereby effectively preventing foreign matter (such as water or dust) from entering the accommodating space 23 through the above gaps, thereby improving the service life of the overall structure.

[0083] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hub motor, characterized in that: Contains: A housing having a non-output end and an output end; a motor disposed in the housing and having a stator and a rotor rotatable relative to the stator; A first spindle is disposed at the non-output end of the housing and allows the housing to rotate relative to it, one end of the first spindle is passed through the housing and fixedly connected to the stator of the motor, and the first spindle has a first shaft hole; A second spindle, disposed at the output end of the housing and allowing the housing to rotate relative thereto, the second spindle having a second shaft hole; a reduction mechanism, disposed in the housing and having a gear shaft, a fixed bracket, a movable bracket, a first ring gear, a second ring gear, a plurality of first planetary gears, and a plurality of second planetary gears, the gear shaft being connected to the rotor of the motor and being located between the first spindle and the second spindle, the gear shaft having a third axial hole coaxially connected to the first axial hole and the second axial hole, the fixed bracket being fixed to the stator of the motor, the movable bracket being rotatably disposed between the gear shaft and the second spindle and having a ring portion, a tooth portion connected to the ring portion, and a fourth axial hole penetrating the ring portion and the tooth portion, the first ring gear being fixed to the fixed bracket, the second ring gear being fixed to the housing, the first planetary gears being pivotally disposed on the ring portion of the movable bracket and meshing with the gear shaft and the first ring gear, the second planetary gears being pivotally disposed on the second spindle and meshing with the tooth portion of the movable bracket and the second ring gear; and A hollow pipe is provided through the first axial hole of the first spindle, the second axial hole of the second spindle, the third axial hole of the gear shaft and the fourth axial hole of the movable bracket.

2. The wheel hub motor according to claim 1, characterized in that: The first spindle also has a first inner flange, which radially protrudes from the hole wall of the first axial hole, and one end of the hollow tube is against the first inner flange.

3. The wheel hub motor according to claim 1, characterized in that: The second spindle also has a second inner flange, which radially protrudes from the hole wall of the second axial hole, and one end of the hollow tube is against the second inner flange.

4. The wheel hub motor according to claim 1, characterized in that: The first spindle also has a first inner flange, which radially protrudes from the hole wall of the first axial hole, and one end of the hollow tube rests on the first inner flange; the second spindle also has a second inner flange, which radially protrudes from the hole wall of the second axial hole, and the other end of the hollow tube rests on the second inner flange.

5. The wheel hub motor according to claim 3 or 4, characterized in that: The second spindle also has an annular groove adjacent to the second inner flange. A sealing ring is arranged in the annular groove and abuts against the outer peripheral surface of the hollow pipe.

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