Wheel hub motor for wheelchair

Abstract

The invention relates to a wheel hub motor for a wheelchair, including a brake anti-slip mechanism composed of a manual unlocking unit, characterized in that: the manual unlocking unit includes an unlocking screw and an unlocking handle, a circular hole is provided on the electromagnet movable plate, and an unlocking screw threaded hole is provided on the electromagnet seat, after the unlocking screw passes through the circular hole, the middle section thread of the unlocking screw is screwed with the unlocking screw threaded hole, and the front end of the unlocking screw is fixedly connected with the unlocking handle, and the unlocking handle drives the unlocking screw to rotate clockwise or counterclockwise, and at the same time, the unlocking screw moves axially forward and backward through its thread pitch, and the unlocking screw drives the electromagnet movable plate and the friction plate to move axially forward and backward synchronously, and reset spring countersunk holes are symmetrically provided on both sides of the unlocking screw threaded hole, and the reset spring countersunk holes are built with electromagnet movable plate reset springs. Beneficial effects: The invention has a simple structure and light weight, which not only saves space but also saves costs.

Description

Technical Field

[0001] The invention belongs to the field of motors, and in particular relates to a hub motor for a wheelchair. Background Art

[0002] Compared with ordinary wheelchairs, electric wheelchairs do not require human power, which brings great convenience to people with limited mobility. Since most electric wheelchair users have limited mobility and are less able to respond to emergencies during driving, electric wheelchairs must have an anti-slip function.

[0003] Patent Publication No. 206060595U discloses a safety brake device for an electric wheelchair, characterized in that it includes a control chip, a three-phase relay, a transistor and a resistor, wherein the three-phase relay has a normally closed three-phase contact group, wherein the three static contacts in the normally closed three-phase contact group are respectively connected to the three-phase input lines of the motor in the electric wheelchair, and the three moving contacts in the normally closed three-phase contact group are electrically connected; one tap of the coil in the three-phase relay is connected to the positive output terminal of the main power supply of the electric wheelchair, and the other tap of the coil in the three-phase relay is connected to the collector of the transistor, the emitter of the transistor is grounded, and the voltage output terminal of the control chip is connected to the base of the transistor through the resistor. In the prior art, when the battery fails and the control chip is damaged, the three-phase relay has no working voltage, and the three-phase input line of the motor is automatically short-circuited to achieve electronic braking, so that the electric wheelchair is safe and still has electronic braking when a fault occurs. In this way, the braking torque is related to the moving speed of the wheelchair, that is, the higher the speed of the wheelchair, the greater the braking torque, and conversely, the lower the speed of the wheelchair, the smaller the braking torque. When the wheelchair is in a stationary state, there is no braking torque. Therefore, when the wheelchair is parked on a road with a certain slope, it will slowly slide, posing a safety hazard. For this reason, a wheelchair motor with a mechanical brake device installed on the wheelchair motor has been developed. The basic structure is that an electromagnetic brake device sold on the market is installed on one side of the motor to realize the anti-slip function. The electromagnetic brake device is equipped with an unlocking unit. The purpose is that when the wheelchair is out of power and enters the manual pushing state, the electromagnetic brake device needs to be unlocked to reduce the braking resistance before the wheelchair can be pushed. The unlocking unit of the prior art has many parts and a complex structure, which makes the electromagnetic brake device large and heavy, and cannot meet the requirements of a foldable wheelchair.

[0004] There is an urgent need to launch a hub motor product with a simple structure, small size, light weight, and anti-slip function suitable for installation on a foldable electric wheelchair on the market.

[0005] Inventive Content

[0006] The invention aims to overcome the deficiencies in the prior art and provide a wheel hub motor for a wheelchair with a simple structure and light weight.

[0007] The present invention is to achieve the above-mentioned purpose through the following technical scheme: a wheel hub motor for a wheelchair, comprising a main shaft, a stator, a rotor and a brake anti-slip mechanism mainly composed of an electromagnet seat, an electromagnet coil, an electromagnet movable plate, an electromagnet movable plate reset spring, a friction plate and a manual unlocking unit, wherein the manual unlocking unit comprises an unlocking screw and an unlocking handle, the electromagnet movable plate is provided with a circular hole, the electromagnet seat is provided with an unlocking screw threaded hole, after the unlocking screw passes through the circular hole, the middle section thread of the unlocking screw is screwed with the unlocking screw threaded hole, the front end head of the unlocking screw is fixedly connected with the unlocking handle, the unlocking handle drives the unlocking screw to rotate clockwise or counterclockwise, and at the same time the unlocking screw moves axially forward and backward through its thread pitch, and the unlocking screw drives the electromagnet movable plate and the friction plate to move axially forward and backward synchronously, and reset spring countersunk holes are symmetrically provided on both sides of the unlocking screw threaded hole, and the reset spring countersunk holes are equipped with electromagnet movable plate reset springs.

[0008] The front end of the unlocking screw of the manual unlocking unit is provided with a thread, the thread at the front end of the unlocking screw is screwed with the threaded hole of the electromagnet movable plate, the electromagnet seat is provided with a round hole, the middle section of the unlocking screw is slidably connected with the round hole, and the rear end of the unlocking screw is fixedly connected to the unlocking handle.

[0009] The unlocking handle includes an unlocking wrench and an unlocking handle arm, which are connected at right angles to form an integral unlocking handle. A circular hole fixed to the unlocking screw is provided at the center of the front end of the unlocking handle arm, and lugs are symmetrically provided on both sides of the circular hole. A fan-shaped positioning groove is provided on the inner side of the front end of the unlocking handle arm, and ball ejection spring countersunk holes are symmetrically provided on the end surface of the electromagnet seat relative to the unlocking handle. The ball ejection spring countersunk holes have ejection springs built in them, and a positioning ball is provided between the top of the ejection spring and the inner side surface of the front end of the unlocking handle arm.

[0010] The reset spring countersunk hole is symmetrically arranged within a straight line perpendicular to a horizontal line connecting the main shaft and the center of the unlocking screw.

[0011] The ball ejection spring countersunk hole is arranged on the upper and lower sides of the threaded hole of the unlocking screw.

[0012] The electromagnet seat is fixedly connected with an unlocking signal switch, which is connected in series with the electromagnet coil. The unlocking signal switch contacts the lug of the unlocking handle. The lug of the unlocking handle presses down or releases the unlocking signal switch, and the unlocking signal switch is connected or disconnected accordingly. Beneficial effect: Compared with the prior art, the structure of the invention is simple and light, which not only saves space but also saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a partial cross-sectional view of Example 1;

[0014] Figure 2 is a schematic diagram of the appearance of Example 1;

[0015] Figure 3 is an exploded view of the brake part of Embodiment 1;

[0016] Figure 4 is a three-dimensional cross-sectional view of the brake part of Example 1;

[0017] Figure 5 Schematic diagram of the handle position in the locked state of the anti-slip function of Example 1;

[0018] Figure 6 is a schematic diagram of the handle position in the unlocked state of the anti-slip function of Example 1;

[0019] Figure 7 It is a left side oblique view of the electromagnet portion of Example 1;

[0020] Figure 8 It is a right side oblique view of the electromagnet portion of Example 1;

[0021] Fig. 9 is a three-dimensional oblique view of the handle portion of Example 1;

[0022] Fig.10 This is a partial cross-sectional view of Example 2.

[0023] In the figure: 1, main shaft, 2, stator, 3, rotor, 4, rotor support bearing, 5, electromagnet seat, 5-1, unlocking screw threaded hole, 5-2, electromagnet movable plate reset spring countersink, 5-3, electromagnet movable plate positioning hole, 5-4, ball ejection spring countersink, 6, electromagnet coil, 7, electromagnet movable plate, 7-1, unlocking screw perforation, 8, friction plate, 9, unlocking screw, 10, electromagnet movable plate reset spring, 11, unlocking handle, 11-1, fan-shaped positioning groove, 11-2, lug, 11-3, unlocking wrench, 11-4, unlocking handle arm, 12, end cover, 13, end cover support bearing, 14, wheel hub, 15, protective cover, 16, friction plate fixing screw, 17, positioning ball, 18, ball ejection spring, 19, unlocking signal switch, 20, tire. DETAILED DESCRIPTION

[0024] The following is a detailed description of the specific implementation methods provided according to the present invention in combination with the preferred embodiments:

[0025] As shown in the accompanying drawings, this embodiment discloses a wheel hub motor for a wheelchair, including a main shaft 1, a stator 2, a rotor 3, a rotor support bearing 4, an end cover 12, an end cover support bearing 13, a wheel hub 14, a tire 20 is arranged outside the wheel hub, and a brake anti-slip mechanism mainly composed of an electromagnet seat 5, an electromagnet coil 6, an electromagnet moving plate 7, an electromagnet moving plate reset spring 10, a friction plate 8 and a manual unlocking unit, wherein the manual unlocking unit includes an unlocking screw 9 and an unlocking handle 11, and a circular hole is arranged on the electromagnet moving plate, namely, an unlocking screw through hole 7-1, and an electric The magnet seat is provided with an unlocking screw thread 5-1. After the unlocking screw passes through the circular hole, the middle section of the unlocking screw thread is screwed with the unlocking screw thread hole, and the front end of the unlocking screw is fixedly connected with the unlocking handle. The unlocking handle drives the unlocking screw to rotate clockwise or counterclockwise. At the same time, the unlocking screw moves axially forward and backward through its thread pitch. The unlocking screw drives the electromagnet moving plate and the friction plate to move axially forward and backward synchronously. Reset spring countersunk holes 5-2 are symmetrically provided on both sides of the unlocking screw thread hole. The reset spring countersunk holes are built with electromagnet moving plate reset springs 10. The outer end of the anti-slip mechanism is provided with a protective cover 15. The friction plate and the electromagnet moving plate are fixed with friction plate fixing screws 16, and the screws are inserted into the positioning holes of the electromagnet moving plate by 3-5mm to prevent the electromagnet moving plate from rotating with the rotor, that is, to play a role of stopping rotation.

[0026] The preferred solution of this embodiment is that the unlocking handle includes an unlocking wrench 11-3 and an unlocking handle arm 11-4, and the unlocking wrench and the unlocking handle arm are connected at a right angle to form an integral unlocking handle, and a circular hole fixed to the unlocking screw is provided at the center of the front end of the unlocking handle arm, and lugs 11-2 are symmetrically provided on both sides of the circular hole, and a fan-shaped positioning groove 11-1 is provided on the inner side of the front end of the unlocking handle arm, and a ball ejection spring countersunk hole 5-4 is provided on the electromagnet seat, and a ball ejection spring 18 is built in the ball ejection spring countersunk hole, and a positioning ball is provided between the top of the ejection spring and the inner side surface of the front end of the unlocking handle arm, and when the unlocking handle rotates clockwise or counterclockwise, the unlocking handle arm presses the positioning ball, and when the positioning ball falls into the fan-shaped positioning groove and makes a sound, it can be prompted that the unlocking handle is in place. The positioning ball ejection spring countersunk hole is placed on the upper and lower sides of the threaded hole of the unlocking screw on the outer side of the electromagnet seat.

[0027] The preferred solution of this embodiment is that an unlocking signal switch 19 is fixedly connected to the electromagnet seat, the unlocking signal switch is connected in series with the electromagnet coil 6, the unlocking signal switch is in contact with the lug of the unlocking handle, the lug of the unlocking handle presses down or releases the unlocking signal switch, and the unlocking signal switch is connected or disconnected accordingly.

[0028] Working process and principle

[0029] When the electric wheelchair is in a non-electric driving state, the electromagnet is powered off, and the electromagnet movable plate is pressed against the side of the rotor together with the friction plate under the action of the electromagnet movable plate return spring. The friction force between the friction plate and the rotor generates anti-slip resistance for the wheel hub motor to achieve the anti-slip function.

[0030] When electric driving is required, the electromagnet is energized to attract the electromagnet moving plate and friction plate, separating the friction plate from the rotor and releasing the anti-slip resistance.

[0031] When the electric wheelchair is out of power and needs to be pushed manually, you first need to manually release the anti-slip resistance so that the wheelchair can be pushed easily. Figure 5 The figure shows the anti-slip function locked state. At this time, the friction plate and the rotor are pressed tightly. Turn the handle counterclockwise to Figure 6 In the position shown, the friction plate is separated from the rotor and no anti-slip resistance is generated.

[0032] The specific implementation method is as follows: Figure 1 , 3 As shown in , 4, the unlocking screw passes through the electromagnet movable plate and the nut hooks the electromagnet movable plate, the middle section of the unlocking screw is screwed with the threaded hole of the electromagnet seat, and the part of the unlocking screw protruding from the electromagnet seat is fixedly connected to the unlocking handle. When the unlocking handle rotates clockwise / counterclockwise, the unlocking screw rotates synchronously with the unlocking handle and moves axially left / right at the same time. The above-mentioned axial movement is used to control the left and right movement of the electromagnet movable plate and the friction plate to realize the locking and unlocking of the anti-slip function.

[0033] After manual unlocking, the electric wheelchair will lose its anti-slip function, which is a dangerous state. Therefore, after manual unlocking, an unlocking state signal needs to be provided to indicate that it is in the unlocking state. Figure 5 , Figure 6 As shown, according to the different positions of the unlocking handle, the unlocking handle lug presses down or releases the unlocking signal switch, and the unlocking signal switch is connected or disconnected accordingly. Specifically, when the unlocking handle is in Figure 5 When the unlocking handle is in the unlocking position, the lug presses down the switch, and the unlocking signal switch is turned on, and the unlocking handle is disengaged. Figure 5 When the unlocking signal switch is in the locked position, the unlocking signal switch is disconnected, and the unlocking signal switch is connected in series with the electromagnet coil. When it is connected, the electromagnet coil has a certain resistance, and when it is disconnected, the resistance is infinite. The state of the resistance is used to determine whether the motor is in the locked state or the unlocked state.

[0034] Example 2

[0035] The front end of the unlocking screw of the manual unlocking unit is provided with a thread, the thread at the front end of the unlocking screw is screwed with the threaded hole of the electromagnet movable plate, the electromagnet seat is provided with a round hole, the middle section of the unlocking screw is slidably connected with the round hole, and the rear end of the unlocking screw is fixedly connected to the unlocking handle.

[0036] The difference between Example 2 and Example 1 lies in the different counterparts that cooperate with the unlocking screw thread. In Example 1, the unlocking screw passes through the electromagnet movable plate and is screwed to the electromagnet seat. When the unlocking screw rotates, the unlocking screw is stationary in the axial direction relative to the electromagnet movable plate, and moves axially relative to the electromagnet seat. In Example 2, the unlocking screw passes through the electromagnet seat and is screwed to the electromagnet movable plate. When the unlocking screw rotates, the unlocking screw is stationary in the axial direction relative to the electromagnet seat, and moves axially relative to the electromagnet movable plate.

[0037] The detailed description of the wheel hub motor for a wheelchair with reference to the above embodiment is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the scope of protection of the present invention.

Claims

1. A wheel hub motor for a wheelchair, comprising a main shaft, a stator, a rotor and a brake anti-slip mechanism mainly composed of an electromagnet seat, an electromagnet coil, an electromagnet rotor, an electromagnet rotor return spring, a friction plate and a manual unlocking unit, wherein: The manual unlocking unit comprises an unlocking screw and an unlocking handle, a circular hole is provided on the electromagnet movable plate, an unlocking screw threaded hole is provided on the electromagnet seat, after the unlocking screw passes through the circular hole, the middle section thread of the unlocking screw is screwed with the unlocking screw threaded hole, the front end of the unlocking screw is fixedly connected with the unlocking handle, the unlocking handle drives the unlocking screw to rotate clockwise or counterclockwise, and at the same time, the unlocking screw moves axially forward and backward through its thread pitch, and the unlocking screw drives the electromagnet movable plate and the friction plate to move axially forward and backward synchronously, and reset spring countersunk holes are symmetrically provided on both sides of the unlocking screw threaded hole, and the reset spring countersunk holes are built with electromagnet movable plate reset springs; The front end of the unlocking screw of the manual unlocking unit is provided with a thread, and the thread at the front end of the unlocking screw is screwed with the threaded hole of the electromagnet moving plate, and a round hole is provided on the electromagnet seat, and the middle section of the unlocking screw is slidably connected with the round hole, and the rear end of the unlocking screw is fixedly connected with the unlocking handle; the unlocking handle comprises an unlocking wrench and an unlocking handle arm, and the unlocking wrench and the unlocking handle arm are connected at a right angle to form an integral unlocking handle, and the front end center of the unlocking handle arm is provided with a round hole fixedly connected to the unlocking screw, and lugs are symmetrically provided on both sides of the round hole, and a fan-shaped positioning groove is provided on the inner side of the front end of the unlocking handle arm, and the end surface of the electromagnet seat relative to the unlocking handle is symmetrically provided with A ball ejector spring countersink has an ejector spring built in the ball ejector spring countersink, and a positioning ball is provided between the top of the ejector spring and the inner side surface of the front end of the unlocking handle arm; the ball ejector spring countersink is placed on the upper and lower sides of the threaded hole of the unlocking screw; the reset spring countersink is symmetrically arranged within a straight line range perpendicular to the horizontal line connecting the main shaft and the center of the unlocking screw; an unlocking signal switch is fixedly connected to the electromagnet seat, the unlocking signal switch is connected in series with the electromagnet coil, the unlocking signal switch is in contact with the lug of the unlocking handle, the lug of the unlocking handle presses down or releases the unlocking signal switch, and the unlocking signal switch is connected or disconnected accordingly.

Images