A braking and unlocking device based on a magnetic braking mechanism

Abstract

The present invention relates to a braking and unlocking device based on a magnetic braking mechanism, which is arranged in a motor with a magnetic braking mechanism. The magnetic braking mechanism includes a magnetic brake seat arranged on the motor shaft, a fixed piece connected to one end of the magnetic brake seat and axially spaced from the magnetic brake seat by a distance L, a friction plate, a moving piece axially movably arranged in the interval, and a spring arranged between the moving piece and the magnetic brake seat. The braking and unlocking device includes an unlocking handle and several transmission rods. The unlocking handle is sleeved on the motor shaft, and several protrusions are circumferentially distributed on one end face. The upper end face of the protrusion is a spiral surface, and each protrusion is provided with an arc groove hole adapted to the spiral radius of the spiral surface. The transmission rod passes through the arc groove hole and the magnetic brake seat, is connected to the moving piece at one end, and is connected to the unlocking handle at the other end. When the unlocking handle is rotated, the spiral surface at the upper end of the protrusion moves relative to the connection end of the transmission rod and the unlocking handle, so that the transmission rod drives the moving piece to move axially. The motor in the braking state can be manually released from the braking state under the condition of power failure, which facilitates the movement of the wheelchair.

Description

Technical Field

[0001] The present invention relates to a brake release device, and more particularly to a brake unlocking device based on a magnetic brake mechanism. Background Art

[0002] An electric motor for driving a walking wheel is braked by a magnetic brake mechanism on its rotating components. Usually, power is cut off from the magnetic brake mechanism to make it lose magnetic force for braking. However, this often causes great trouble. When the battery of the driving motor is powered off or has no power, it will automatically enter a braking state. At this time, if it is necessary to move a wheelchair, it becomes very difficult to release the braking state of the wheels. Summary of the Invention

[0003] The object of the present invention is to provide a brake unlocking device based on a magnetic brake mechanism that can manually release the braking state formed by the magnetic brake mechanism when the driving motor is powered off. The specific technical solution is as follows:

[0004] The brake unlocking device based on the magnetic brake mechanism is arranged in an electric motor with a magnetic brake mechanism. The magnetic brake mechanism includes a magnetic brake seat arranged on the motor shaft, a stationary piece connected to one end of the magnetic brake seat and axially spaced from the magnetic brake seat by a distance L, a friction plate, a moving piece that can be axially moved in the interval, and a spring arranged between the moving piece and the magnetic brake seat. The characteristics are as follows: The brake unlocking device includes an unlocking handle and several transmission rods. The unlocking handle is sleeved on the motor shaft, and several protrusions are circumferentially distributed on one end face. The upper end face of the protrusion is a spiral surface, and each protrusion is provided with an arc groove hole adapted to the spiral radius of the spiral surface. The transmission rod passes through the arc groove hole and the magnetic brake seat, one end is connected to the moving piece to form a first connection end, and one end is connected to the unlocking handle to form a second connection end; when the unlocking handle rotates, the spiral surface at the upper end of the protrusion moves relative to the second connection end, causing the transmission rod to axially move.

[0005] A further design is also as follows:

[0006] The unlocking handle includes an annular connecting portion and a rod-shaped operating portion connected to one side of the connecting portion. The unlocking handle is sleeved on the motor shaft through the hole in the center of the connecting portion, and several protrusions are evenly distributed in a circumferential direction of the connecting portion. By rotating the operating portion, the unlocking handle rotates around the motor shaft.

[0007] The moving piece is provided with several counterbores in the circumferential direction; the first connection end is a structure adapted to the counterbore at the corresponding end of the transmission rod; the second connection end is composed of an external thread provided at the corresponding end of the transmission rod and a nut screwed onto the external thread; one end of the transmission rod is axially limitedly connected to the moving piece through the cooperation of the first connection end and the counterbore on the moving piece, one end extends out of the arc groove hole and is screwed with a nut, and one end of the nut abuts against the spiral surface at the upper end of the protrusion.

[0008] One end of the nut is a spherical surface, and the nut abuts against the spiral surface at the upper end of the protrusion through the spherical surface.

[0009] On one side of the upper end of the spiral surface, there is a plane intersecting with the spiral surface. On the two parallel groove walls of the arc-shaped groove hole corresponding to the plane, there are positioning grooves with spherical concave surfaces respectively. The positioning grooves are adapted to the spherical surfaces of the spherical surfaces at one end of the nut, and the maximum curvature diameter of the spherical concave surface is greater than the width of the arc-shaped groove hole.

[0010] On one side of the upper end of the spiral surface, there is a plane intersecting with the spiral surface. On the side corresponding to the plane, there is an annular positioning groove with a diameter greater than the width of the arc-shaped groove hole and communicating with the arc-shaped groove hole.

[0011] The first connecting end portion includes: a shoulder provided at the corresponding end of the transmission rod and adapted to the counterbore, or is composed of an external thread provided at the corresponding end of the transmission rod and a nut adapted to the counterbore and screwed to the external thread.

[0012] By providing a protruded unlocking handle and combining the transmission forming rod braking unlocking device with the spring and the moving piece in the magnetic brake mechanism, the present invention can manually release the braking state of the wheel by operating the unlocking handle even when the motor is powered off, which facilitates the movement of the wheelchair in the case of power failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the magnetic brake mechanism mainly composed of a fixed piece, a moving piece, a friction piece, a spring and a magnetic brake seat in a non-braking state.

[0014] Figure 2 is as Figure 1 shown schematic structural diagram of the magnetic brake mechanism in a braking state.

[0015] Figure 3 is a schematic structural diagram of the braking unlocking mechanism configured on the magnetic brake mechanism, wherein the magnetic brake mechanism is in a braking state.

[0016] Figure 4 is a schematic structural diagram of the braking unlocking mechanism of Embodiment 1.

[0017] Figure 5 is Figure 4 shown partial three-dimensional structural diagram of the braking unlocking mechanism.

[0018] Figure 6 is Figure 5 shown sectional view taken along line B-B in the partial three-dimensional structural diagram.

[0019] Figure 7 is Figure 3 shown partial enlarged view in the schematic structural diagram of the braking unlocking mechanism configured on the magnetic brake mechanism.

[0020] Figure 8 It is a schematic structural diagram of a braking unlocking mechanism configured on a magnetic braking mechanism, where the magnetic braking mechanism is in a braking state.

[0021] Figure 9 is Figure 8 A partial enlarged view in the schematic structural diagram of the braking unlocking mechanism configured on the magnetic braking mechanism shown.

[0022] Figure 10 is Figure 5 A sectional view taken along the C-C position in the shown partial three-dimensional structural diagram.

[0023] Figure 11 It is a schematic structural diagram of the braking unlocking mechanism of Embodiment 2.

[0024] Figure 12 is Figure 1 A three-dimensional structural diagram of the protrusion in the shown braking unlocking mechanism.

[0025] Figure 13 is Figure 11 A sectional view taken along the E-E position in the schematic structural diagram of the shown braking unlocking mechanism.

[0026] Figure 14 It is a schematic structural diagram in which both ends of a transmission rod are respectively connected to a moving piece and an unlocking handle to form corresponding first and second connection ends. Detailed implementation manners

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Embodiment 1

[0029] As Figure 1, the magnetic brake mechanism mainly consists of a fixed plate 31, a moving plate 32, a friction plate 35, a spring 33 and a magnetic brake seat 34. The magnetic brake mechanism is arranged on the outer side of the brake body 1 of the motor. The magnetic brake seat 34 is connected to the motor shaft 20 through a key 36. The fixed plate 31 is connected to one axial side of the magnetic brake seat through a spacer sleeve 37 with a length of L, so that the axial distance between it and the magnetic brake seat is L. The friction plate 35 and the moving plate 32 are axially movably placed within this distance. The center of the friction plate 35 is provided with a polygonal hole, and through this hole, it is sleeved on the corresponding polygonal boss 131 extending towards the friction plate side of the support seat 13, so that the friction plate is connected to the support seat without relative rotation. The sum of the thicknesses of the friction plate 35 and the moving plate 32 is less than L, that is, there is still a gap δ after the friction plate 35 and the moving plate 32 are placed between the fixed plate 31 and the magnetic brake seat 34. The moving plate 32 is sleeved on the motor shaft 20, and three springs 33 are provided between it and the magnetic brake seat to elastically connect the two. A coil 341 is provided inside the magnetic brake seat 34. When the motor is working normally, the coil is energized. The energized coil 341 will generate a magnetic force opposite to the direction of the spring force. This magnetic force acts on the moving plate 32, enabling the moving plate 32 to overcome the spring force that separates it from the magnetic brake seat by the spring 33 and stick to the corresponding end of the magnetic brake seat. Thus, there is a gap between the friction plate 35 and the fixed plate 31, and its maximum gap is the above-mentioned gap δ. If the wheelchair needs to brake, at this time, the coil 341 is powered off. The moving plate 32 is only affected by the elastic force of the spring 33. The spring force pushes the moving plate away from the magnetic brake seat 34, generating a gap δ, as Figure 2 , and under the push of the moving plate 32, the friction plate 35 is tightly attached to the fixed plate 31. Thus, both sides of the friction plate that follows the rotation of the support seat 34 are respectively pushed by the non-rotating fixed plate 31 and the moving plate 32, so that the rotation of the friction plate is braked, and thus the rotation of the support seat connected to the friction plate and the corresponding rotating body is braked.

[0030] To solve the problem that the above magnetic brake mechanism can release the braked state of the wheelchair when power is lost, the present invention provides a braking unlocking device mainly composed of an unlocking handle 40 and a transmission rod 43, as Figures 3 - 6 , the braking unlocking mechanism mainly consists of an unlocking handle 40 and a transmission rod 43. The unlocking handle 40 of this embodiment includes an annular connecting portion 401 and a rod-shaped operating portion 402 connected to one side of the connecting portion. The unlocking handle 40 is sleeved on the motor shaft 20 through the hole 4011 in the center of the connecting portion. Three protrusions 41 are evenly distributed in the circumferential direction of the connecting portion. The upper end of the protrusion is provided with a spiral surface 411 with a spiral radius of R. Each protrusion is provided with an arc groove hole 44 adapted to the spiral radius of the spiral surface. The transmission rod 42 passes through the through hole 347 on the magnetic brake seat 34, one end is connected to the moving plate 32 to form a first connection end, and one end is connected to the unlocking handle 40 to form a second connection end.

[0031] To facilitate the connection between the moving plate and the transmission rod, as Figure 3 and Figure 7As shown, several counterbores are circumferentially and uniformly distributed on the moving piece 32. The counterbores in this embodiment are stepped holes 321. The corresponding end of the transmission rod 43 is provided with a first connecting end formed by a shoulder 431 adapted to the stepped hole. The moving piece is axially limited and connected through the cooperation of the first connecting end and the stepped hole. The other end of the transmission rod 43 is provided with an external thread. The transmission rod 43 extends out of the arc-shaped slot hole 44 through this end and is externally connected with a nut 42 to form a second connecting end, and the unlocking handle 40 is connected through the second connecting end. Since a spring 33 is provided between the moving piece and the magnetic brake seat 34, one end of the nut 42 is elastically abutted against the spiral surface at the upper end of the protrusion, that is, against the arc-shaped slot hole 44 on the spiral surface. One end of the nut 42 in this embodiment is a spherical surface 421, and the spherical surface 421 abuts against the spiral surface, thereby reducing the contact surface with the spiral surface and thus reducing the frictional force. When the operating part 402 of the unlocking handle is rotated to rotate it around the motor shaft, the spiral surface 411 at the upper end of the protrusion rises or falls relative to the nut 42 connected to the transmission rod. The spiral surface drives the transmission rod to axially move by pushing against the nut 42. When the magnetic brake mechanism is in the braking state, at this time, the coil in the magnetic brake seat 34 is powered off, and the spring 33 makes a gap δ between the moving piece 32 and the magnetic brake seat 34, while there is no gap between the friction plate and the stationary piece and the moving piece, and both sides are clamped by the stationary piece and the moving piece. At this time, the nut 42 is at the low-end ab position of the spiral surface 411. When it is necessary to unlock its braking state, the operating part 402 of the unlocking handle is rotated, and the spiral surface 411 abutting against the nut 42 gradually rises. The nut 42 rises to the cd position under the push of the spiral surface 411, as Figure 8 and Figure 9 shown, so that the transmission rod moves to the right, driving the moving piece to move to the right until the moving piece abuts against the corresponding end of the magnetic brake seat 34, so that there is a gap between the friction plate and the stationary piece and the moving piece, thereby eliminating the braking state of the wheelchair.

[0032] Since the nut 42 at the connection end of the transmission rod 43 and the unlocking handle 40 is at the high position of the spiral surface in the non-braking state, in order to ensure stability at this position, a plane 412 intersecting with the spiral surface is provided on one side of the upper end of the spiral surface 411. Spherical concave positioning grooves 413 are respectively provided on the two parallel groove walls of the arc-shaped slot hole corresponding to one side of the plane. See Figure 6 、 Figure 10 . The positioning groove is adapted to the spherical surface at one end of the nut, and the curvature diameter D of the spherical concave surface is greater than the groove width K of the arc-shaped slot hole 44. By rotating the unlocking handle around the motor shaft, the spiral surface 411 drives the transmission rod to move outward by pushing against the nut 42. When reaching the highest position of the spiral surface, continue to rotate the unlocking handle 40. Since the transmission rod 43 is pulled by the spring 33, the nut 42 screwed on one end of the transmission rod quickly slides into the positioning groove 413 through the spherical surface. Since the width K of the arc-shaped slot hole is smaller than the curvature diameter D of the positioning groove 413, the possibility of the transmission rod sliding along the arc-shaped slot hole 44 is blocked, and the corresponding end of the transmission rod is stably in the positioning groove.

[0033] Embodiment 2

[0034] The braking unlocking device of this embodiment is used for the magnetic brake mechanism described in the above-mentioned Embodiment 1, and its structure is as follows Figure 11 shown, mainly composed of an unlocking handle 40 and a transmission rod 43. The unlocking handle 40, like the above-mentioned embodiment, includes an annular connecting portion 401 and a rod-shaped operating portion 402 connected to one side of the connecting portion. The unlocking handle 40 is sleeved on the motor shaft 20 through the hole 4011 at the center of the connecting portion. The three protrusions 48 are evenly distributed in the circumferential direction of the connecting portion, and its structure is as follows Figure 12 , 13 shown. The upper end of the protrusion 48 is also provided with a spiral surface 481 with a spiral radius of R. Each protrusion is provided with an arc groove hole 44 adapted to the spiral radius of the spiral surface 481. One side of the upper end of the spiral surface is provided with a plane 482 that intersects the spiral surface. However, on the side corresponding to the plane, there is a circular positioning groove 483 with a diameter D larger than the width K of the arc groove hole and communicating with the arc groove hole. The diameter of the circular positioning groove is not greater than the curvature diameter Dq of the spherical surface at one end of the nut 42 and is adapted to a diameter on the spherical surface

[0035] As shown in Figure 14 , the two ends of the transmission rod 43 are respectively provided with external threads. The transmission rod 43 passes through the through hole 347 on the magnetic brake seat 34, and one end is located in the counterbore 321 of the moving piece 32. A nut 432 is screwed to form a first connection end. The nut 432 is adapted to the counterbore, and the moving piece 32 is connected to one end of the transmission rod in a buried manner. The counterbore is also a stepped hole. The other end of the transmission rod 43 extends out of the arc groove hole 44 and is screwed with a nut 42 with a spherical surface to form a second connection end. The spherical surface on the nut 42 abuts against the spiral surface 483 at the upper end of the protrusion

[0036] By rotating the unlocking handle around the motor shaft, the spiral surface 481 pushes the nut 42 to move the transmission rod outward. When reaching the highest position of the spiral surface, continue to rotate the unlocking handle 40. The nut 42 screwed on the transmission rod 43 quickly slides into the positioning groove 483 through the spherical surface. Since the width K of the arc groove hole is smaller than the diameter D of the circular positioning groove 483, and at the same time the transmission rod is also affected by the spring 33, the nut 42 cannot slide out of the positioning groove without external force and remains in a stable state

[0037] The function of this embodiment in cooperation with the magnetic brake mechanism is the same as that of the above-mentioned embodiment, and will not be elaborated one by one

Claims

1. A braking and unlocking device based on a magnetic brake mechanism, which is arranged in a motor with a magnetic brake mechanism. The magnetic brake mechanism includes a magnetic brake seat arranged on the motor shaft, a fixed piece connected to one end of the magnetic brake seat and axially spaced from the magnetic brake seat by a distance L, a friction plate, a moving piece that can be axially moved and arranged within the interval, and a spring arranged between the moving piece and the magnetic brake seat, and is characterized in that: The braking and unlocking device includes an unlocking handle and several transmission rods. The unlocking handle is sleeved on the motor shaft, and several protrusions are circumferentially distributed on one end face. The upper end face of the protrusion is a spiral surface, and each protrusion is provided with an arc-shaped slot hole adapted to the spiral radius of the spiral surface. The transmission rod passes through the arc-shaped slot hole and the magnetic brake seat, one end is connected to the moving piece to form a first connection end, and one end is connected to the unlocking handle to form a second connection end; when the unlocking handle rotates, the spiral surface at the upper end of the protrusion moves relative to the second connection end, causing the transmission rod to move axially; the unlocking handle includes an annular connection part and a rod-shaped operation part connected to one side of the connection part. The unlocking handle is sleeved on the motor shaft through the hole in the center of the connection part, and several protrusions are evenly distributed in a circumferential direction of the connection part. By rotating the operation part, the unlocking handle rotates around the motor shaft; the moving piece is provided with several counterbore holes in the circumferential direction; the first connection end is a structure provided at the corresponding end of the transmission rod and adapted to the counterbore hole; the second connection end is composed of an external thread provided at the corresponding end of the transmission rod and a nut screwed onto the external thread; one end of the transmission rod is axially and limitedly connected to the moving piece through the cooperation of the first connection end and the counterbore hole on the moving piece, one end extends out of the arc-shaped slot hole and is screwed with a nut, and one end of the nut abuts against the spiral surface at the upper end of the protrusion; One end of the nut is a spherical surface, and the nut abuts against the spiral surface at the upper end of the protrusion through the spherical surface; One side of the upper end of the spiral surface is provided with a plane intersecting with the spiral surface. On the two parallel groove walls of the arc-shaped slot hole corresponding to the plane side, spherical concave positioning grooves are respectively provided, and the positioning grooves are adapted to the spherical surface of the spherical surface at one end of the nut.

2. The braking and unlocking device based on a magnetic braking mechanism according to claim 1, characterized in that: One side of the upper end of the spiral surface is provided with a plane intersecting with the spiral surface. On the two parallel groove walls of the arc-shaped slot hole corresponding to the plane side, spherical concave positioning grooves are respectively provided, and the positioning grooves are adapted to the spherical surface of the spherical surface at one end of the nut, and the maximum curvature diameter of the spherical concave surface is greater than the width of the arc-shaped slot hole.

3. The braking and unlocking device based on a magnetic braking mechanism according to claim 1, wherein: One side of the upper end of the spiral surface is provided with a plane intersecting with the spiral surface. Corresponding to the plane side, a circular ring-shaped positioning groove with a diameter larger than the width of the arc-shaped slot hole and communicating with the arc-shaped slot hole is provided.

4. A braking and unlocking device based on a magnetic braking mechanism according to claim 1, characterized in that: The first connection end includes: a shoulder provided at the corresponding end of the transmission rod and adapted to the counterbore hole, or is composed of an external thread provided at the corresponding end of the transmission rod and a nut screwed onto the external thread and adapted to the counterbore hole.

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