CN110601433B

CN110601433B - Motor center shaft, driver, wheel and wheelchair

Info

Publication number: CN110601433B
Application number: CN201910909105.1A
Authority: CN
Inventors: 黄益双
Original assignee: Lovetech Co ltd
Current assignee: Lovetech Co ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2022-05-13
Anticipated expiration: 2039-09-25
Also published as: JP6907356B2; JP2021052571A; CN110601433A

Abstract

The invention provides a motor center shaft, which is provided with a first end and a second end, wherein an installation part is arranged between the first end and the second end and is used for fixing with a motor stator, the center shaft is provided with a hollow section, the first end is provided with a first connection structure, and the first connection structure is used for connecting a connector so as to fixedly connect a battery through the connector.

Description

Motor center shaft, driver, wheel and wheelchair

Technical Field

The invention relates to a bracket, in particular to a unidirectional rotating bracket.

Background

Electric wheels are generally driven to rotate by a motor, which in turn enables the device on which the wheel is mounted to travel. The motor needs a battery to supply power, and in the prior art, the battery is arranged on the device main body, and the battery cannot be arranged on the existing wheel.

Disclosure of Invention

Therefore, the invention needs to provide a motor center shaft, which is convenient for installing a battery on the motor center shaft, so that the battery is installed on a wheel, and the space utilization rate of the wheel can be improved.

The invention provides a motor center shaft, which is provided with a first end and a second end, wherein an installation part is arranged between the first end and the second end and used for being fixed with a motor stator, the center shaft is provided with a hollow section, the first end is provided with a first connection structure, and the first connection structure is used for being connected with a connector so as to be fixedly connected with a battery through the connector.

Furthermore, a first through hole and a second through hole which are communicated with the hollow section are formed in the wall of the middle shaft, the first through hole is located at the first end, an electric wire electrically communicated with the battery can penetrate through the first through hole to enter the hollow section, and the second through hole can be used for the electric wire located in the hollow section to extend out.

Further, the second through-hole is located installation department position department, with the power supply line of battery conductance can pass first through-hole gets into in the hollow section, and then for the motor power supply.

Further, the hollow section extends to the second end, and the second through hole is close to the second end.

Furthermore, the connector comprises a positive electrode and a negative electrode which are contacted with the conducting electrodes of the battery, and a second clamping structure which is used for corresponding to the first clamping structure of the battery.

Still provide a motor axis, the axis has first end and second end, first end with the installation department has between the second end, the installation department is used for fixed with motor stator, the second end is equipped with second connection structure, the axis has hollow section, first end is equipped with first connection structure, first connection structure is connected with the connector, the connector is used for connecting the battery.

The driver comprises a motor, a gearbox and the middle shaft, the mounting part is fixed with a stator of the motor, and a rotor of the motor is sleeved on the middle shaft and is in transmission with the gearbox and used for driving a shell of the gearbox to rotate relative to the middle shaft.

Further, the outer peripheral edge of gearbox housing to stator one side extends and is formed with the ring arm, the lateral surface of ring arm is formed with connecting portion, the ring arm have around the annular of stator, the annular is used for acceping the ring portion of battery.

There is also provided a wheel comprising a rim and an inner hub comprising said driver, the outer shell of said gearbox being attached to said rim.

A wheelchair comprising the wheel is also provided.

The invention can install the needed battery at the first end of the middle shaft, and fix the battery and the middle shaft on the wheel, thereby improving the space utilization rate of the wheel.

Drawings

Fig. 1 is a schematic structural view of a wheel according to an embodiment.

Fig. 2 is an enlarged view of I1 of fig. 1.

Fig. 3 is a front view of the wheel of the embodiment.

Fig. 4 is a force-receiving schematic view of the wheel of the first embodiment.

Fig. 5 is a force-receiving schematic view of the wheel of the second embodiment.

Fig. 6 is a schematic diagram of a driver with a battery.

Fig. 7 is a cross-sectional view of the actuator with the battery removed.

Fig. 8 is a schematic structural view of a bottom bracket of the embodiment.

Fig. 9 is a schematic structural view of a battery according to an embodiment.

Fig. 10 is a schematic view of the inside of the battery with the front case removed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The present embodiment provides a wheel, it can be understood that the wheel can be mounted on any device that can use wheels, such as an electric vehicle, an electric bicycle, an electric wheelchair, etc., without limitation, so that the device can realize wheel walking through the wheel.

As shown in fig. 1 and 2, the wheel includes a rim 100 and an inner hub 110, and at rest, the rim 100 is connected with the inner hub 110 and the centers of the two are substantially coincident, and the inner hub 110 may be located at the center. A tire 120 or the like may be mounted on the outer side of the rim 100. The wheel has a first side C1 and a second side C2 with respect to the plane in which the wheel lies.

Specifically, a deformable ring plate 130 is installed between the rim 100 and the inner hub 110 such that the ring plate 130 can be compressed or rebounded. The center of the ring plate 130 substantially coincides with the center of the rim 100 or the inner hub 110. The ring plate 130 may be made of metal such as steel. The thickness of the ring plate 130 (i.e. the thickness in the radial direction) is smaller than the length of the ring plate 130 (i.e. the length in the axial direction), wherein the thickness of the ring plate 130 can be set according to practical application, the larger the thickness of the ring plate 130, the weaker the deformability is, the stronger the rigidity is, and the smaller the thickness of the ring plate 130, the better the deformability is.

To facilitate subsequent installation, a plurality of installation pieces 131 may be fixed to the ring piece 130, so that the first bearing 132 and the second bearing 133 are installed through the installation pieces 131.

The rim 100 is provided with a plurality of first mounting locations 101, and the first mounting locations 101 can be fixed with third bearings 102. The inner hub 110 is provided with a plurality of second mounting locations 111, and a fourth bearing 112 may be fixed to the second mounting locations 111. Wherein the number of the first bearings 132 is equal to the number of the third bearings 102, and the number of the second bearings 133 is equal to the number of the fourth bearings 112. A first connecting arm 140 is connected between the ring 130 and the rim 100, and a second connecting arm 150 is connected between the ring 130 and the inner hub 110. The first and second connecting

arms

140 and 150 may be bar steel. The first connecting arm 140 is connected to a first bearing 132 and a third bearing 102 at two ends, respectively, and the second connecting arm 150 is connected to a second bearing 133 and a fourth bearing 112 at two ends, respectively, so that the first connecting arm 140 and the second connecting arm 150 are distributed annularly around the center, and the two ends of the first connecting arm 140 and the second connecting arm 150 are relatively rotatable.

The third bearing 102 serves as a first connecting point at which the first connecting arm 140 is connected to the rim 100. The first bearing 132 serves as a second connection point at which the first connection arm 140 is connected to the ring plate 130. The second bearing 133 serves as a third connection point for the second connecting arm 150 to the ring plate 130. The fourth bearing 112 serves as a fourth connection point for the second connection arm 150 to the inner hub 110.

When the device encounters a bumpy road surface or the running speed is changed in the running process, under the action of inertia, because of the less than complete rigid connection between the rim 100 and the inner hub 110, the speed magnitude or speed direction of the rim 100 and the inner hub 110 may not be uniform, since the first and second connecting

arms

140 and 150 are rotatable, when the center of the rim 100 is deviated from the center of the inner hub 110 or the inner hub 110 is rotated with respect to the rim 100, the ring plate 130 is pulled by the first and second connecting

arms

140 and 150, so that the ring plate 130 is deformed to a certain extent, the ring plate 130 tends to return to its original shape under the action of its own elasticity, the inner hub 110 can be restored to the balance position, for example, the center is consistent with the center of the rim 100 again, so that the wheel has the buffer effect, and the device is more stable when driving.

In this embodiment, as shown in fig. 3, a connecting line L1 between the first connecting point and the second connecting point does not coincide with a diametrical line of the rim 100 at the first connecting point, i.e., the first connecting arm 140 as a whole is angled with respect to the corresponding diametrical line, and may be inclined from the radially outer direction toward the first rotational direction about the center. A connecting line L2 between the third and fourth connecting points does not coincide with a diametrical line of the inner hub 110 at the third connecting point, i.e. the second connecting arm 150 as a whole is angled with respect to the corresponding diametrical line, which may be inclined from a radially outer direction towards the first rotational direction S1 about the center or a second rotational direction opposite to the first rotational direction. Thus, when the road surface is bumpy or the running speed is changed, the first connecting arm 140 or the second connecting arm 150 can rotate more easily (i.e. the rim 100 and the inner hub 110 are less rigid) under the inertia effect, and the ring plate 130 can be compressed and deformed more easily, so that the inner hub 110 can be better buffered by the ring plate 130.

It should be noted that, as shown in fig. 4, if the inclination direction of the whole first connecting arm 140 is the same as the inclination direction of the whole second connecting arm 150, under the action of inertia, the center of the inner hub 110 will deviate from the center of the rim 100 toward the direction M1, and the inner hub 110 will act on the second connecting arm 150 to rotate the second connecting arm 150 around the third connecting point toward the deviation direction M2, because the first connecting arm 140 and the second connecting arm 150 incline in the same direction, the first connecting arm 140 rotates toward the direction M3, so that the ring plate 130 will rotate relative to the rim 100 (the direction M4) while being deformed, and further, the inner hub 110 will also rotate relative to the rim 100, and the balance will be slightly poor. However, as shown in fig. 5, when the tilting direction of the whole first connecting arm 140 is opposite to the tilting direction of the whole second connecting arm 150, under the action of inertia, the center of the inner hub 110 is deviated from the center of the rim 100 toward the direction M1, the inner hub 110 acts on the second connecting arm 150 to rotate the second connecting arm 150 around the third connecting point toward the deviation direction M2, the ring plate 130 tends to rotate relative to the rim 100 (the direction M4) under the driving of the second connecting arm 150, but at this time, the first connecting arm 140 pulls the ring plate 130 (the direction M3) to be unable to rotate relative to the rim 100, so the rotation amplitude of the inner hub 110 relative to the rim 100 is small and can be ignored, and the restoring force of the ring plate 130 to the inner hub 110 is basically opposite to the inertia direction, and therefore, the inner hub 110 is more stable.

In this embodiment, the number of the first connecting arms 140 and the second connecting arms 150 is equal, and the first connecting arms 140 and the second connecting arms 150 are distributed in an annular array, that is, the first connecting arms 140 and the second connecting arms 150 form a group of arms in a one-to-one correspondence. The first bearing 132 and the second bearing 133 are located on the first side and the second side of the ring plate 130, respectively, and the first connecting arm 140 and the second connecting arm 150 are more balanced when subjected to a force. The first bearing 132 and the corresponding second bearing 133 are located at the same position on the circumference of the ring plate 130, i.e. the second connection point and the third connection point can be considered to coincide.

As shown in fig. 6 and 7, the inner hub 110 includes a driver. The drive may include a motor 200, a gearbox 210, a central shaft 220, and a battery 230. The motor 200 may be a brushless motor having a rotor 201 and a stator 202. Referring to fig. 8, the bottom bracket 220 has a first end 221 and a second end 222 with a mounting portion 223 between the first end 221 and the second end 222. The stator 202 is fixed to the mounting portion 223. The gearbox 210 comprises a housing 211 and a gear set arranged in the housing 211, wherein the gear set comprises a central tooth 212, a plurality of driven teeth 213 and a gear ring 214, the central tooth 212 is meshed with the driven teeth 213, and the driven teeth 213 are meshed with the gear ring 214 to form a star-shaped gear set. The ring gear 214 is fixed with the housing 211 and the fourth bearing 112 may be mounted on the housing 211. The central gear 212 is sleeved on the central shaft 220 and fixed with the rotor 201, so that the central gear 212 is driven to rotate around the central shaft 220 through rotation, the driven gear 213 rotates, and the gear ring 214 drives the housing 211 to rotate, and thus, the whole wheel can rotate relative to the central shaft 220 to run.

In one embodiment, the outer periphery of the housing 211 extends toward the stator 202 to form a ring arm 2111, a connection portion 2113 is formed on the outer side surface of the ring arm 2111, and the fourth bearing 112 is mounted on the connection portion 2113. The side of the arm 2111 near the first end 221 of the central shaft 220 is recessed to form a ring slot 2112, and the ring slot 2112 surrounds the stator 202.

A first end 221 of the central shaft 220 extends outside the stator 202 and a second end 222 of the central shaft 220 extends outside the housing 211. The first end 221 has a first connection structure 2211 for securing the connector 240. The second end 222 has a second connection structure 2221 for securing the device to mount the wheel on the device. The connector 240 fixedly connects the battery 230 so that the battery 230 can be fixed at the first end 221 of the bottom bracket 220 to be mounted on the wheel without being mounted at other positions of the device, thereby making full use of the space of the wheel and also facilitating the power supply of the motor 200.

The connector 240 may include positive and negative electrodes 241 and a snap structure 242, the connector 240 may be snapped by the snap structure 242 (e.g., a snap groove) on the connector 240 and a snap structure 2312 (e.g., a snap and see also) on the battery 230 such that the battery 230 is secured to the first end 221 of the central axle 220 and the positive and negative electrodes 241 contact the conductive poles 233 (see also) of the battery 230.

The middle shaft 220 has a hollow section 224, the hollow section 224 extends to the first end 221, a first through hole 2212 can be opened on the wall of the first end 221, a second through hole 225 can be opened on the middle shaft 220, and the first through hole 2212 and the second through hole 225 are communicated with the inner hollow. Specifically, the second through-hole 225 may be opened on the mounting portion 223 and/or near the second end 222. Cables, such as wires electrically connected to the positive and negative electrodes 241 and signal wires connected to a controller, may be disposed in the hollow section 224. The arrangement of the cables may be set according to practical circumstances, for example, the cables electrically connected to the positive and negative electrodes 241 at the first end 221 may be passed through the first through hole 2212 into the hollow section 224 and then extended from the position near the second end 222 through the second through hole 225 to facilitate connection with a controller and the like.

As shown in fig. 9 and 10, the battery 230 may include a housing 231 and a plurality of battery cells 232 disposed in the housing 231, and the battery cells 232 may include a plurality of battery cells and be uniformly arranged. The housing 231 has a slot 2311 near the first side, and the slot 2311 has a shape substantially the same as the shape of the connector 240 and can receive the connector 240. The sidewall of the slot 2311 is provided with a conductive electrode 233 electrically connected to the battery cell 232 and a clamping structure 2312, and the connection manner with the connector 240 can be referred to the above, which is not described herein again.

With reference to fig. 6 and 7, a ring portion 2313 surrounding the slot 2311 is formed at one side of the slot 2311 on the periphery of the housing 231, a receiving groove 2314 is formed in the middle of the ring portion 2313, when the battery 230 is snapped onto the connector 240, the receiving groove 2314 can receive the stator 202, the ring portion 2313 is received in the ring groove 2112, and the ring groove 2112 of the transmission case can rotate relative to the ring portion 2313 of the battery 230. Since the connecting portion 2113 connected to the second connecting arm 150 is located on the outer side surface of the ring arm 2111, the center of gravity of the whole of the battery 230 and the actuator after combination is substantially on the plane where the connecting portion 2113 is located, that is, the center of gravity of the whole of the battery 230 and the actuator after combination is substantially on the surface of the rim 100, so that the whole can be smoothly suspended by the rim 100 without being inclined to the first side or the second side.

To facilitate the detachment of the battery 230 from the connector 240, the battery 230 further includes a shifting block 234, the engaging structure 2312 is connected to a shifting plate 235, the shifting plate 235 is connected to a spring 236, and the spring 236 biases the engaging structure 2312 in the engaging direction. In the initial state, the spring 236 is pre-tensioned, the snap-fit structure 2312 engages the snap-fit structure 242, and the battery 230 is secured to the connector. The position of the shifting block 234 is changed by external force, the shifting block 234 drives the shifting plate 235 to overcome the pretightening force of the spring 236 and move towards the direction of separating from the clamping, the clamping structure 2312 is connected with the shifting plate 235 to separate, and the battery 230 can be taken down from the connector. Specifically, the shifting block 234 is disposed on the rotating shaft 237, the rotating shaft 237 may be connected to the handle 239, and the handle 239 is disposed on a side of the housing 231 facing away from the slot 2311. The rotating shaft 237 is connected with a torsion spring 238, the torsion spring 238 pre-tensions the rotating shaft 237, the shifting block 234 does not contact with the shifting plate 235 in a pre-tensioned state, the clamping structure 2312 is matched with the clamping structure 242, the handle 239 is pulled, the rotating shaft 237 overcomes the pre-tensioned force of the torsion spring 238, the shifting block 234 gradually abuts against the shifting plate 235, the clamping structure 2312 is separated from the clamping structure 242, and the handle 239 is released to restore the original state.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A driver comprises a motor and a gearbox, and is characterized by further comprising a middle shaft, wherein the middle shaft is provided with a first end and a second end, an installation part is arranged between the first end and the second end, the installation part is fixed with a motor stator, the middle shaft is provided with a hollow section, the first end is provided with a first connection structure, the first connection structure is connected with a connector, the connector is fixedly connected with a battery, the second end is provided with a second connection structure for fixing a device and installing wheels on the device, a rotor of the motor is sleeved on the middle shaft and is in transmission with the gearbox for driving a gearbox shell to rotate relative to the middle shaft, an outer peripheral edge of the gearbox shell extends to one side of the stator to form a ring arm, a connecting part is formed on the outer side surface of the ring arm, and the ring arm is provided with a ring groove surrounding the stator, the battery includes the casing and locates electric core in the casing, the casing is close to first end forms the slot, the lateral wall of slot be equipped with the conducting electrode that the electric core electricity is connected, the connector is connected insert the slot and with the conducting electrode contact, the annular is used for acceping the ring portion of battery, ring portion installation electric core.

2. A wheel comprising a rim and an inner hub, wherein the inner hub comprises the drive of claim 1, and wherein the outer casing of the gearbox is attached to the rim.

3. A wheelchair comprising a wheel as claimed in claim 2.