Braking device, wheel assembly, and walking aid

Abstract

The present invention discloses a braking device, a wheel body assembly, and a walking aid, the braking device comprising: an axle, a housing, a magnetic induction mechanism, and an adjustment mechanism, the housing is rotatable relative to the axle, the magnetic induction mechanism is provided in the housing, and is used to generate a resistance to the housing or the axle through a magnetic field reaction when the housing is rotated relative to the axle, the adjustment mechanism is connected to the magnetic induction mechanism, and is used to adjust the magnitude of the resistance, the magnetic induction mechanism is provided to generate resistance, the wheel body formed integrally with the braking device or connected to the braking device can play a braking role, and the braking force is not friction braking but is related to the rotation of the housing or the axle, so that no emergency stop effect is generated, safety is higher, and wear can be reduced, the service life of the braking device is extended, and at the same time, the structure of the braking device is simple and easy to manufacture, and the adjustment mechanism is provided to automatically adjust the resistance, making the application range of the braking device wider and more intelligent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a braking device, a wheel body assembly, and a walking aid.

Background Art

[0002] An auxiliary walking device such as a walking aid can assist the walking of people with limited movement ability, such as patients with lesions in the lower limbs and the elderly. For example, a walking aid is a support frame, and the user can support the support frame with both hands, lift the support frame during walking and move it, and achieve the purpose of moving the body.

[0003] As a result of long-term research and development, the applicant of the present invention has discovered that the user always needs to lift the support frame during walking, which is more burdensome, has a slower moving speed, and is inconvenient to use. Currently, although wheels are provided at the bottom of the support frame to increase flexibility, the support force and speed applied to the user during the movement process cannot be controlled, so the user is likely to fall and the safety is worse. When braking through a braking device, the operation requirements for the user become higher, and the emergency stop of the brake is also dangerous.

Summary of the Invention

[0004] In order to solve the technical problem of the prior art that the safety is reduced when wheels are provided on devices such as walking aids, the present invention provides a braking device, a wheel body assembly, and a walking aid.

[0005] In order to solve the above technical problem, one technical solution adopted in the present invention is to provide a braking device, and the braking device includes a shaft body, and a housing sleeved on the shaft body and arranged coaxially with the shaft body, the housing being rotatable relative to the shaft body A magnetic induction mechanism provided within the housing, which generates resistance in the housing in the opposite direction to the rotation direction of the housing, or generates resistance in the shaft in the opposite direction to the rotation direction of the shaft, by magnetic field reaction when the housing is rotated relative to the shaft. The system includes an adjustment mechanism connected to the magnetic induction mechanism and used to adjust the magnitude of the resistance.

[0006] To solve the above technical problems, another technical solution employed in the present invention is to provide a wheel body assembly, which is: The braking device described above is provided, and the housing is provided in an annular shape for use as the wheel body, or The system comprises a braking device and a wheel body as described above, and the wheel body is connected to the housing or the axle body.

[0007] To solve the above technical problems, another technical solution employed in the present invention provides a walking aid comprising a main frame and a wheel body assembly as described above, wherein the wheel body assembly is rotatably connected to the bottom of the main frame.

[0008] The braking device of the present invention comprises a shaft, a housing, a magnetic induction mechanism, and an adjustment mechanism. The housing is sleeved to the shaft and arranged coaxially with the shaft, and the housing is rotatable relative to the shaft. The magnetic induction mechanism is provided within the housing and is used to generate resistance in the opposite direction of the housing's rotation to the housing itself, or resistance in the opposite direction of the shaft's rotation to the shaft itself, by magnetic field reaction when the housing rotates relative to the shaft. The adjustment mechanism is connected to the magnetic induction mechanism and is used to adjust the magnitude of the resistance. By providing the magnetic induction mechanism and generating resistance, the braking device can perform a braking function on the wheel body, which is either integrally formed with or connected to the braking device. Furthermore, since the braking force is not frictional braking but is related to the rotation of the housing or shaft, it does not produce an emergency stop effect, is safer, reduces wear, extends the service life of the braking device, has a simple structure, is easy to manufacture, and by providing the adjustment mechanism to automatically adjust the resistance, the range of application of the braking device can be broadened and made more intelligent. [Brief explanation of the drawing]

[0009] To more clearly explain the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings necessary for use in the description of the embodiments. However, the drawings in the following description represent only some embodiments of the present invention, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without requiring any creative effort. [Figure 1] This is a schematic diagram of the structure of a first embodiment of the braking device of the present invention. [Figure 2] This is a schematic diagram of the structure of a first embodiment of the braking device of the present invention. [Figure 3] This is a schematic diagram of the structure of a first embodiment of the braking device of the present invention. [Figure 4] This is a schematic diagram of the structure of a first embodiment of the braking device of the present invention. [Figure 5] This is a schematic diagram of the structure of a first embodiment of the braking device of the present invention. [Figure 6] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 7] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 8] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 9] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 10] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 11] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 12] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 13] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [Figure 14] It is a schematic structural diagram of the second embodiment of the braking device of the present invention. [[ID=2F]] [Figure 15] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 16] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 17] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 18] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 19] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [[ID=4F]] [Figure 20] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 21] It is a schematic structural diagram of the third embodiment of the braking device of the present invention. [Figure 22] It is a schematic structural diagram of the fourth embodiment of the braking device of the present invention. [Figure 23] It is a schematic structural diagram of the fourth embodiment of the braking device of the present invention. [Figure 24] It is a schematic structural diagram of the fourth embodiment of the braking device of the present invention. [Figure 25] It is a schematic structural diagram of the fourth embodiment of the braking device of the present invention. [Figure 26] It is a schematic structural diagram of a fourth embodiment of the braking device of the present invention. [Figure 27] It is a schematic structural diagram of a fifth embodiment of the braking device of the present invention. [Figure 28] It is a schematic structural diagram of a fifth embodiment of the braking device of the present invention. [Figure 29] It is a schematic structural diagram of a fifth embodiment of the braking device of the present invention. [Figure 30] It is a schematic structural diagram of a fifth embodiment of the braking device of the present invention. [Figure 31] It is a schematic structural diagram of a sixth embodiment of the braking device of the present invention. [Figure 32] It is a schematic structural diagram of a sixth embodiment of the braking device of the present invention. [Figure 33] It is a schematic structural diagram of a sixth embodiment of the braking device of the present invention. [Figure 34] It is a schematic structural diagram of a sixth embodiment of the braking device of the present invention. [Figure 35] It is a schematic structural diagram of a seventh embodiment of the braking device of the present invention. [Figure 36] It is a schematic structural diagram of a seventh embodiment of the braking device of the present invention. [Figure 37] It is a schematic structural diagram of a seventh embodiment of the braking device of the present invention. [Figure 38] It is a schematic structural diagram of an eighth embodiment of the braking device of the present invention. [Figure 39] It is a schematic structural diagram of an eighth embodiment of the braking device of the present invention. [Figure 40] It is a schematic structural diagram of a ninth embodiment of the braking device of the present invention. [Figure 41] It is a schematic structural diagram of a ninth embodiment of the braking device of the present invention. [Figure 42] It is a schematic structural diagram of a ninth embodiment of the braking device of the present invention. [Figure 43] It is a schematic structural diagram of a tenth embodiment of the braking device of the present invention. [Figure 44] It is a schematic structural diagram of a tenth embodiment of the braking device of the present invention. [Figure 45] It is a schematic structural diagram of a tenth embodiment of the braking device of the present invention. [Figure 46] This is a schematic diagram of the tenth embodiment of the braking device of the present invention. [Figure 47] This is a schematic diagram of the 11th embodiment of the braking device of the present invention. [Figure 48] This is a schematic diagram of the twelfth embodiment of the braking device of the present invention. [Figure 49] This is a schematic diagram of the twelfth embodiment of the braking device of the present invention. [Figure 50] This is a schematic diagram of a second embodiment of the wheel body assembly of the present invention. [Figure 51] This is a schematic diagram of the first embodiment of the walking aid of the present invention. [Figure 52] This is a schematic diagram of a second embodiment of the walking aid of the present invention. [Modes for carrying out the invention]

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below, in conjunction with the drawings of the embodiments. However, it is clear that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of the present invention are all within the scope of protection of the present invention.

[0011] In this invention, the terms “first” and “second” are used solely for descriptive purposes and are not intended to indicate or imply relative importance, nor do they implicitly specify the number of technical features described. In this description, “plural” means at least two, such as two, three, etc., unless explicitly and specifically limited. In addition, the terms “includes” and “equipment” and all their variations are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units not listed, or optionally includes other steps or units specific to the process, method, product, or apparatus. On the other hand, the term “and / or” is simply a description of the relationship between related objects, indicating that there may be three possible relationships, for example, A and / or B can be expressed as A alone, both A and B, and B alone. Also, the symbol “ / ” in this specification generally indicates that preceding and succeeding related objects are in an “or” relationship.

[0012] Referring to Figures 1 to 4, the first embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction member 310, and a magnet assembly 320. The housing 200 is sleeved on the shaft 100 and is arranged coaxially with the shaft 100. The housing 200 is rotatable relative to the shaft 100. A coil 311 is wound around the magnetic induction member 310. The magnet assembly 320 comprises a plurality of magnets arranged at intervals along the circumferential direction of the shaft 100. Here, one of the magnetic induction member 310 and the magnet assembly 320 is connected to the shaft 100, and the other is connected to the housing. By being connected to the ring 200, when the housing 200 rotates relative to the shaft 100, the coil 311 can interrupt the magnetic field formed by the magnet assembly 320, generating resistance opposite to the direction of rotation of the housing 200 or shaft 100, thereby performing a braking function for the braking device 10. Furthermore, since the braking force is not frictional braking but is related to the rotation of the housing 200 or shaft 100, it does not cause an emergency stop effect, resulting in higher safety, reduced wear, and a longer service life for the braking device 10. At the same time, its structure is simple and easy to manufacture.

[0013] In this embodiment, the braking device 10 may further include a tire 400, which is sleeved in the housing 200 and can perform a vibration damping function.

[0014] Specifically, referring to Figure 5, the magnet may comprise a first magnet 321 and a second magnet 322, and in this embodiment, the first magnet 321 and the second magnet 322 will be described as an example. The magnet assembly 320 is rotated counterclockwise in Figure 5 at a speed v, the magnetic induction member 310 is stationary, the magnetic field strengths generated by the first magnet 321 and the second magnet 322 are B1 and B2, respectively, the magnetic pole of the first magnet 321 facing the magnetic induction member 310 is the North Pole, the magnetic pole of the second magnet 322 facing the magnetic induction member 310 is the South Pole, the portions that cut the magnetic induction wire of the coil 311 are the c-side portion and the d-side portion, and the projection is in the direction that cuts the magnetic induction wire of the coil 311 (i.e., the circumferential direction of the shaft 100). Let L be the length of the c-side portion or the d-side portion along the axial direction of the shaft 100. If the direction of the induced current generated by the c-side portion is shown as the forward direction in Figure 5, and the direction of the induced current generated by the d-side portion is shown as the reverse direction in Figure 5, then the Ampere force generated by the c-side portion is Fc = nB1Lv, and the Ampere force generated by the d-side portion is Fd = nB2Lv, where n is the number of turns of the coil 311. Since the direction of both Ampere forces is clockwise, the resultant force is F = nB1Lv + nB2Lv. The magnetic field strengths generated by the first magnet 321 and the second magnet 322 are equal, i.e., B1 = B2 = B, so F = 2*nBLv.

[0015] In this embodiment, the resistance is in relation to the rotational speed of the housing 200 or shaft 100, and can also be obtained from F = 2*nBLv. That is, the greater the rotational speed of the housing 200, the greater the resistance in the opposite direction to the rotation of the housing 200, which is generated when the coil 311 cuts the magnetic field formed by the magnet assembly 320. Therefore, if the rotational speed of the braking device 10 does not change, a constant braking force can be applied, resulting in better stability. On the other hand, if the rotational speed of the braking device 10 increases, a greater braking force can be applied, preventing the braking device 10 from moving too quickly and improving safety.

[0016] In this embodiment, the number of magnets is even, and the multiple magnets are arranged symmetrically with respect to the axis of the shaft 100. This makes the distribution of the magnetic field formed by the magnet assembly 320 more uniform, and consequently, the resistance generated when the coil 311 cuts the magnetic field formed by the magnet assembly 320 can be made more stable.

[0017] In this embodiment, the magnetic poles of two magnets symmetrical with respect to the axis 100 are set in the same direction, and the magnetic poles of two adjacent magnets are set in opposite directions. Here, if we define the mounting direction of the magnetic poles of the magnets as the direction toward the axis of the shaft 100 and the direction toward the axis of the shaft 100, then the magnetic poles of the two magnets are in the same direction, that is, both magnetic poles of the two magnets are either toward the axis of the shaft 100 or toward the axis of the shaft 100, and the magnetic poles of the two magnets are in opposite directions, that is, one magnetic pole of the two magnets is toward the axis of the shaft 100 and the other magnetic pole is toward the axis of the shaft 100. With the above magnet settings, the distribution of the magnetic field formed by the magnet assembly 320 can be made more uniform, and consequently, the resistance generated when the coil 311 cuts the magnetic field formed by the magnet assembly 320 can be made more stable.

[0018] In this embodiment, the magnetic induction member 310 comprises a main body portion 312 and a plurality of mounting portions 313 provided at intervals along the outer circumference of the main body portion 312, and the coil 311 is wound around the mounting portions 313, thereby making the relative position between the coil 311 and the magnetic induction member 310 more stable.

[0019] In this embodiment, the mounting portion 313 may be provided in an "I" shape, which facilitates the winding of the coil 311, restricts the position of the coil 311, prevents it from falling off the mounting portion 313 in a direction away from the coil 311 shaft 100, and makes the overall structure of the coil 311 and magnetic induction member 310 more stable.

[0020] In other embodiments, the mounting portion 313 may be provided in a straight line to allow winding of the coil 311, and is not limited thereto.

[0021] In this embodiment, the maximum width of the coil 311 on the mounting portion 313 along the circumferential direction of the shaft 100 is equal to the width of the magnet along the circumferential direction of the shaft 100, and the maximum length of the coil 311 on the mounting portion 313 along the axial direction of the shaft 100 is greater than or equal to the length along the axial direction of the magnet shaft 100. As a result, the coil 311 can continuously disconnect the magnetic field formed by the magnet assembly 320 as it moves relative to the magnet, thereby generating continuous resistance and improving the stability of the resistance.

[0022] In other embodiments, the maximum width of the coil 311 on the mounting portion 313 along the circumferential direction of the shaft 100 may be greater than the width of the magnet along the circumferential direction of the shaft 100, and is not limited thereto.

[0023] In this embodiment, the difference between the maximum width of the coil 311 on the mounting portion 313 along the circumferential direction of the shaft 100 and the width of the magnet along the circumferential direction of the shaft 100 is a, and the width of the magnet along the circumferential direction of the shaft 100 is b, where the ratio of a to b is 10% or less, for example 10%, 8%, or 5%. When a is 0, the coil 311 can continuously disconnect the magnetic field formed by the magnet assembly 320 as it moves relative to the magnet, and when a is greater than 0, both sides of the coil 311 exist simultaneously in regions corresponding to the same magnetic pole for a certain period of time, the current generated in the coil 311 is 0, and the resistance is intermittent.

[0024] In this embodiment, the number of magnets is greater than the number of mounting parts 313, and the difference between the number of magnets and the number of mounting parts 313 is a positive integer. This allows the magnetic field generated by the magnets on the coil 311 to function continuously without interruption, thereby generating resistance continuously and improving the stability of the resistance.

[0025] In this embodiment, all coils 311 on the multiple mounting portions 313 come together to form a closed loop. Specifically, it is possible for all coils 311 to be short-circuited and not connected to any other devices. In other embodiments, devices such as switches and resistors may be connected externally, but the closed loop in this embodiment does not include devices such as drivers; that is, the current generated by the coils 311 in this embodiment is used only to generate an Ampere force, or is used primarily to generate an Ampere force.

[0026] In other embodiments, the coils 311 on each of the multiple mounting portions 313 may form a closed loop, or the coils 311 on at least two of the multiple mounting portions 313 may together form a closed loop, but are not limited thereto.

[0027] In this embodiment, a housing space is formed in the housing 200, and an opening (not shown) is formed on one side of the housing 200, and the magnetic induction member 310 and the magnet assembly 320 are provided within the housing space. The braking device 10 further includes a cover plate 510, which covers the opening and protects components such as the magnetic induction member 310 and the magnet assembly 320, as well as giving the braking device 10 a more regular appearance.

[0028] In this embodiment, the cover plate 510 and the shaft 100, and the cover plate 510 and the housing 200 can be fixedly connected by screws. In other embodiments, the cover plate 510 and the housing 200 may also be connected by snaps, welding, paste, etc., and are not limited thereto.

[0029] In this embodiment, the braking device 10 may further include a first bearing 520 and a second bearing 530. The first bearing 520 is provided between the shaft 100 and the housing 200, and the second bearing 530 is provided between the shaft 100 and the cover plate 510. By providing the first bearing 520 and the second bearing 530, the frictional force between the shaft 100 and the housing 200, and between the shaft 100 and the cover plate 510 can be reduced. They also play a role in supporting the shaft 100, thereby extending the service life of the shaft 100, the housing 200, and the cover plate 510.

[0030] Referring to Figures 1, 6, and 7, a second embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 610. The magnetic induction mechanism 300 is provided within the housing 200 and is used to generate resistance to the housing 200 in the opposite direction of rotation of the housing through a magnetic field reaction when the housing 200 is rotated, or to generate resistance to the shaft 100 in the opposite direction of rotation of the shaft 100. The adjustment mechanism 610 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance, where the magnetic induction mechanism 300 comprises a magnetic induction member 310 and a magnet assembly 320. The structures of the shaft 100, housing 200, magnetic induction member 310, and magnet assembly 320 can be found in the first embodiment of the braking device 10 described above and will not be repeated here. By providing the adjustment mechanism 610, the resistance can be automatically adjusted, making the range of application of the braking device 10 wider and more intelligent.

[0031] Referring together to Figures 8 to 12, in this embodiment, the adjustment mechanism 610 comprises an adjustment member 611 and at least one resistor 612. The adjustment member 611 is electrically connected to the magnetic induction mechanism 300 and is provided with a first connection part 6111. At least two second connection parts 6121 are provided at each end of the at least one resistor 612. The adjustment member 611 is movable relative to the resistor 612. By electrically connecting the first connection part 6111 to one of the at least two second connection parts 6121, the magnetic induction mechanism 300 can be connected to loads with different resistances, and the resistance can be adjusted.

[0032] In this embodiment, the braking device 10 may further include a first support tube 613, at least one resistor 612 provided on the first support tube 613, and an adjustment member 611 provided in a ring shape and rotatable relative to the first support tube 613, and a first connecting portion 6111 formed in a groove on the outer circumference of the adjustment member 611, the outer surface of the adjustment member 611 being insulated except for the groove, which is conductive. The second connecting portion 6121 includes a contact member 6122 and a first elastic member 6123, the contact member 6122 being electrically connected to the resistor 612. The first elastic member 6123 is used to provide elastic force to the contact member 6122 so that the contact member 6122 contacts the outer circumference of the adjustment member 611. When the first connecting portion 6111 rotates and faces the second connecting portion 6121, the contact member 6122 can contact the first connecting portion 6111, and the contact member 6122 can be electrically connected to the first connecting portion 6111.

[0033] In this embodiment, an annular groove 6112 is formed on the outer circumference of the adjustment member 611, the first connecting portion 6111 is recessed relative to the annular groove 6112, and the end of the abutment member 6122 is provided to protrude in an arc shape, so that at least a part of the abutment member 6122 is embedded in the annular groove 6112, thereby achieving an axial limit on the abutment member 6122 of the first support pipe 613, preventing the abutment member 6122 from coming off the adjustment member 611, and improving the reliability of the braking device 10.

[0034] In this embodiment, the braking device 10 may include a second support pipe 614 and a knob 615 connected to the second support pipe 614. The second support pipe 614 is installed nested with the first support pipe 613, and the adjustment member 611 is installed on the second support pipe 614. As a result, the adjustment member 611 can rotate together with the knob 615, the knob 615 can rotate when subjected to force, and thereby drive the adjustment member 611 to rotate and achieve adjustment. By providing the knob 615, adjustment of the adjustment mechanism 610 can be achieved, making the adjustment operation more convenient, the space occupied by the knob 615 is small, and the overall structure of the adjustment mechanism 610 becomes more compact.

[0035] Referring also to Figure 13, in this embodiment, the braking device 10 may further include a casing 616, the adjustment member 611 and resistor 612 are provided inside the casing 616, an opening 6161 is formed at one end of the casing 616 away from the knob 165, the opening 6161 is provided in a polygonal shape, a limit member 6141 and a second elastic member 6142 are provided at one end of the second support tube 614 away from the knob 615, the second elastic member 6142 is used to provide elastic force to the limit member 6141 so that the limit member 6141 can come into contact with the casing 616 during the rotation of the second support tube 614.

[0036] Specifically, in this embodiment, the opening 6161 includes a plurality of receiving ports 6162 arranged at intervals along the circumferential direction of the first support pipe 613, and when the limit member 6141 is rotated to the receiving ports 6162, the compression distance of the second elastic member 6142 becomes 0, so that the limit member 6141 moves away from the casing 616, or the limit member 6141 comes into contact with the casing 616, but the force acting on the casing 616 becomes 0, and at this time, the first connection The part 6111 abuts against one of the second connecting parts 6121, and when the limit member 6141 is rotated between the two housing openings 6162, the limit member 6141 abuts against the casing 616, but the force acting on the casing 616 is greater than zero. At this time, the first connecting part 6111 does not abut against one of the second connecting parts 6121, so that the user can sense whether the knob 615 has been rotated to a predetermined gear during the rotation process of the knob 615.

[0037] In other embodiments, the adjusting member 611 may be provided in a linear or arc shape and may be a sliding body, and the adjusting member 611 may slide relative to the resistor 612 so that the second connection portion 6121 is electrically connected to the first connection portion 6111.

[0038] In this embodiment, there are multiple resistors 612, which form multiple resistor groups, each resistor group containing at least one resistor 612, and the multiple resistor groups are spaced apart along the axial direction of the first support tube 613. The number of adjusting members 611 is also multiple, and is the same as the number of resistor groups, and the multiple adjusting members 611 are spaced apart along the axial direction of the first support tube 613 and correspond one-to-one with each resistor group. This allows the magnetic induction mechanism 300 to be connected to loads with different resistances, making the resistance adjustment more flexible, wider in range, and more adaptive.

[0039] Referring also to Figure 14, for example, in this embodiment, there are three resistor groups, each used to connect to one of the three wires of the magnetic induction mechanism 300. Each resistor group includes four resistors 612, which are located in the same plane perpendicular to the axial direction of the first support tube 613. Four of the resistors 612 in each resistor group are connected in series. One end of each of the three resistor groups is connected to the others. Second connection portions 6121 corresponding to multiple gears are provided between each resistor 612 and at the other end of each resistor group. For example, three resistors 612 can be connected to the first speed gear, and six resistors 612 can be connected to the second speed gear.

[0040] In other embodiments, the magnetic induction mechanism 300 may be connected to the adjustment mechanism 610 by directly leading two wires, or the magnetic induction mechanism 300 may be connected to the adjustment mechanism 610 via two or three wires after passing through a rectification mechanism (not shown).

[0041] Referring to Figures 1, 15 to 17, the third embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 620. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be explained again here. The adjustment mechanism 620 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0042] In this embodiment, the adjustment mechanism 620 includes an adjustment member and at least one resistor 622, the adjustment member includes at least one key 621, the key 621 is provided with a conductive portion 6211, and the braking device 10 further includes a spaced-apart first connection portion 6221 and a second connection portion 6222, the first connection portion 6221 is electrically connected to one end of the magnetic induction mechanism 300 via the resistor 622, and the second connection portion 6222 is electrically connected to the other end of the magnetic induction mechanism 300, the key 621 can be pressed so that the conductive portion 6211 makes electrical contact between the first connection portion 6221 and the second connection portion 6222, the corresponding resistor 622 can be connected to the magnetic induction mechanism 300 as a load, the resistance can be changed, and by providing the key 621, the adjustment mechanism 620 can be adjusted, the feel of the adjustment can be made clearer and the gear adjustment can be made more reliable.

[0043] In other embodiments, one end of the resistor 622 may be connected to one end of the magnetic induction mechanism 300 via a first connection part 6221, and the other end of the resistor 622 may be connected to the other end of the magnetic induction mechanism 300 via a second connection part 6222. The key 621 can be pressed to cause the conductive part 6211 to conduct electricity between the first connection part 6221 and the second connection part 6222, thereby short-circuiting the resistor 622 and changing the load connected to the magnetic induction mechanism 300, thereby changing the resistance.

[0044] In this embodiment, the adjustment member includes at least two keys 621, each key 621 having a conductive portion 6211, and there are at least two first connecting portions 6221 and two second connecting portions 6222. The two first connecting portions 6221 are connected to both ends of at least one resistor 622, respectively. When one of the at least two keys 621 is pressed, the conductive portion 6211 makes the at least one of the two first connecting portions 6221 and the second connecting portion 6222 conductive, and the resistance can be changed by connecting the corresponding resistor 622 as a load to the magnetic induction mechanism 300.

[0045] In this embodiment, at least two keys 621 may be arranged at intervals along a straight line. In other embodiments, at least two keys 621 may be arranged along a curve or other line, but are not limited thereto.

[0046] Referring together to Figures 18 and 19, in this embodiment, the adjustment mechanism 620 may further include an elastic return assembly, which acts on at least two keys 621 respectively, so that when one of the at least two keys 621 is pressed, the other keys 621 are retracted, thereby the number of connected resistors 622 corresponds to the gears, preventing interference between the gears and making the circuit less prone to short circuits, thus providing higher reliability and safety.

[0047] In this embodiment, the key 621 includes a key body 6212 and a button 6213 provided at one end of the key body 6212, the conductive portion 6211 is provided at the other end of the key body 6212, the elastic return assembly may include a carrier plate 623 and a first limit plate 624, the first limit plate 624 has a first limit slot 6241 formed in the shape of an inverted "L" or inverted "L" shape, the first limit plate 624 includes a limit portion 6242 corresponding to the first limit slot 6241, a first elastic member 6244 is provided between the carrier plate 623 and the first limit plate 624, a limit block 6214 is further provided on the key body 6212, and a second elastic member 6215 is sleeved on the key body 6212. Specifically, when the key 621 is not pressed, the limit block 6214 is positioned above the limit portion 6242. In the process of pressing the key 621, the second elastic member 6215 is compressed and deformed, and the limit block 6214 acts on the limit portion 6242, causing deformation of the first elastic member 6244. The first limit plate 624 slides relative to the carrier plate 623 (for example, to the left in Figure 23), allowing the limit block 6214 to enter the first limit slot 6241. After the first limit plate 624 reaches the bottom of the first limit slot 6241, the first limit plate 624 slides relative to the carrier plate 623 under the action of the first elastic member 6244 (for example, to the right in Figure 23), restricting the limit block 6214 below the limit portion 6242. When another key 621 is pressed, the first limit plate 624 slides again relative to the carrier plate 623 (for example, to the left in Figure 23), causing the limit block 6214 of the limited key 621 to disengage from the corresponding limit portion 6242, and the key 621 can spring back under the action of the second elastic member 6215.

[0048] In this embodiment, the first limit plate 624 is provided with an inclined surface 6243 corresponding to the first limit slot 6241, and the inclined surface 6243 can be used to guide the limit block 6214, facilitating the limit block 6214 to slide down along the inclined surface 6243 and engage into the first limit slot 6241, thereby making the process of pressing the key 621 smoother.

[0049] In this embodiment, the first limit plate 624 is further provided with a housing groove 6245, and the carrier plate 623 is provided with a contact column 6231. Both the first elastic member 6244 and the contact column 6231 are housed within the housing groove 6245, and the contact column 6231 is used to contact the first elastic member 6244. As a result, the structure and position of the first elastic member 6244 are more stable during the compression process.

[0050] Referring to Figure 20, in another specific embodiment, the first elastic member 6246 may also be provided at one end of the first limit plate 624 and may abut against the inner wall of the carrier plate 623, thereby providing elastic force to the first limit plate 624, making the structure simpler and easier to manufacture.

[0051] In this embodiment, a second limit slot 6232 may be further formed in the carrier plate 623, and the limit block 6214 can be housed in the second limit slot 6232 and used to realize a limit on the key 621 in a plane perpendicular to the direction in which the key 621 is pressed (the horizontal plane shown in Figure 20). For example, the second limit slot 6232 can realize a limit on the key 621 in the direction of extension of the carrier plate 623 (the left-right direction shown in Figure 20).

[0052] In this embodiment, the key body 6212 is provided in a cylindrical shape, and the second limit slot 6232 can further restrict the rotation of the key body 6212, thereby preventing the limit block 6214 from shifting relative to the corresponding first limit slot 6241 due to the rotation of the key body 6212. Consequently, the limit block 6214 is not pushed into the first limit slot 6241, improving the reliability of the elastic return assembly.

[0053] In other embodiments, the key housing 626 supporting the key body 6212 and the key body 6212 may be provided with corresponding limit slots and limit protrusions (not shown), respectively, thereby providing a limit on the key 621 in a plane perpendicular to the pressing direction.

[0054] In other embodiments, the key body 6212 may be directly provided as a rectangular column or other shaped column to prevent rotation of the key body 6212, and is not limited thereto.

[0055] Referring to Figure 20, in another specific embodiment, the elastic return assembly may further include a plurality of second limit plates 625, which are arranged sequentially along the extending direction of the first limit plate 624, and a third limit slot 6251 can be formed between two adjacent second limit plates 625, thereby realizing a limit on the key 621 in a plane perpendicular to the pressing direction. Specifically, after the key 621 is pressed, the limit block 6214 acts on two adjacent second limit plates 625, pushing the two adjacent second limit plates 625 to either side of the limit block 6214, so that the other second limit plates 625 come into close contact with each other, thereby forming a third limit slot 6251 for accommodating the limit block 6214 and realizing a limit on the limit block 6214.

[0056] In this embodiment, the second limit plate 625 may further have an inclined surface 6252 which can be used to guide the limit block 6214, facilitating the limit block 6214 to slide down along the inclined surface 6252 and engage into the third limit slot 6251, thereby making the process of pressing the key 621 smoother.

[0057] Referring to Figure 21, in other embodiments, the number of resistors 622 may be multiple, and the multiple resistors 622 may form multiple resistor groups, each resistor group containing at least one resistor 622, and the multiple resistor groups may be spaced apart along a direction perpendicular to the extending direction of the first limit plate 624, and the conductive portion 6211 may make each corresponding resistor 622 in the multiple resistor groups conductive, and thus the corresponding resistor 622 may be connected to the magnetic induction mechanism 300 as a load to achieve resistance change.

[0058] Referring to Figures 1 and 22-24, the fourth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 630. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be repeated here. The adjustment mechanism 630 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0059] In this embodiment, the adjustment mechanism 630 comprises a resistor body 631, a contact member 632 that slides and contacts the resistor body 631, and an adjustment member 633 connected to the contact member 632. The resistor body 631 and the adjustment member 633 are electrically connected to the magnetic induction mechanism 300, respectively. The resistor body 631 is integrally provided, and the sliding contact between the contact member 632 and the resistor body 631 enables stepless adjustment of the resistance value connected to the resistor body 631, thereby enabling stepless adjustment of the resistance and further expanding the range of application of the braking device 10.

[0060] In this embodiment, the braking device 10 further includes a support member 634, and the resistor body 631 is mounted on the support member 634. The support member 634 has an opening 6341 through which wiring for connecting the resistor body 631 and the magnetic induction mechanism 300 passes, thereby preventing interference between the wiring and the resistor body 631, as well as short circuits, and improving the safety of the braking device 10.

[0061] In this embodiment, the braking device 10 may further include a limit member 635, which is provided in correspondence with an opening 6341 for limiting the contact member 632, and is configured to maintain the contact member 632 in contact with the resistor body 631, thereby preventing malfunctions such as the contact member 632 coming off the resistor body 631 and causing a circuit to break, and improving the reliability of the braking device 10.

[0062] In this embodiment, the support member 634 may be provided in a tubular shape, and the resistor body 631 may be provided in a fan-shaped ring shape. The resistor body 631 is wound around the support member 634, thereby making the structure of the adjustment mechanism 630 more compact and reducing the space it occupies.

[0063] In this embodiment, the contact member 632 is an elastic sheet that can elastically contact the resistor body 631, and is designed to maintain contact with the resistor body 631 so that it does not easily come off.

[0064] In this embodiment, the contact member 632 is provided to extend along the circumferential direction of the support member 634, which is advantageous in maintaining contact with the resistor body 631 during the rotation process of the contact member 632 relative to the resistor body 631, thereby increasing reliability and making it easier for the contact member 632 to rotate relative to the resistor body 631.

[0065] In this embodiment, the adjustment member 633 may include a knob, which is provided at one end of the support member 634 and can rotate relative to the support member 634. This drives the contact member 632 to slide relative to the resistor body 631, thereby adjusting the resistance value of the resistor connected to the magnetic induction mechanism 300. By providing a knob to adjust the adjustment mechanism 630, the adjustment operation becomes easier, and the space occupied by the knob is smaller, making the overall structure of the adjustment mechanism 630 more compact.

[0066] In this embodiment, the braking device 10 may further include a casing 636 which is sleeved to a support member 634, and the knob is provided on the casing 636. An overhaul 6361 is formed on the end face of the casing 636 on which the knob is provided, and the knob is connected to the contact member 632 via a connecting member 637 that passes through the overhaul 6361. This prevents the connecting member 637 from interfering with other parts and makes the rotation process of the knob smoother.

[0067] In this embodiment, the braking device 10 may further include a cover (not shown), which is covered by the casing 636 and can serve to protect the adjustment mechanism 630 and provide dust protection, as well as giving the braking device 10 a more regular appearance.

[0068] Referring to Figures 25 and 26, in other embodiments, the number of resistor bodies 631 may be multiple, such as two or three, and the multiple resistor bodies 631 are connected in parallel, and the connecting member 637 is connected to multiple contact members 632 for contacting the corresponding resistor bodies 631, thereby enabling stepless adjustment of the resistance value.

[0069] Referring to Figures 1, 27, and 28, the fifth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 640. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be repeated here. The adjustment mechanism 640 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0070] In this embodiment, the adjustment mechanism 640 comprises a resistor body 641, a contact member 642 that slides and contacts the resistor body 641, and an adjustment member 643 connected to the contact member 642. The contact member 642 is electrically connected to one end of the magnetic induction mechanism 300, and one end of the resistor body 641 is electrically connected to one end of the magnetic induction mechanism 300. The resistor body 641 is integrally provided, and stepless adjustment of the resistance value connected to the resistor body 641 is achieved by the sliding contact between the contact member 642 and the resistor body 641, thereby enabling stepless adjustment of the resistance and further expanding the range of application of the braking device 10.

[0071] In other embodiments, the ends of the resistor body 641 may be electrically connected to the ends of the magnetic induction mechanism 300, respectively, and are not limited thereto.

[0072] In this embodiment, the braking device 10 may further include a casing 644 for forming a housing space for housing the resistor body 641. The casing 644 has a slide groove 6441 formed therein, and the adjustment member 643 includes a handle. The adjustment member is provided on the outside of the casing 644 and is connected to the contact member 642 via a connecting rod 645 that passes through the slide groove 6441. As a result, the adjustment member 643 receives force and drives the contact member 642 to move along the slide groove 6441, thereby adjusting the resistance value of the resistor body 641. The sliding adjustment member 643 enables adjustment of the adjustment mechanism 640, and the user can easily hold it by hand, making the adjustment operation more convenient.

[0073] In this embodiment, the contact member 642 may be electrically connected to the magnetic induction mechanism 300 via a conductive slide (not shown) provided inside the casing 644, or it may be directly electrically connected to the magnetic induction mechanism 300 via wiring, and is not limited thereto.

[0074] Referring to Figures 26, 29, and 30, the number of resistor bodies 641 may be multiple, such as three, and three contact members 642 may be connected to the adjustment member 643. Each contact member 642 contacts the corresponding resistor body 641, thereby achieving stepless adjustment of the resistance value.

[0075] Referring to Figures 1 and 31-33, the sixth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 650. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be explained again here. The adjustment mechanism 650 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0076] In this embodiment, the adjustment mechanism 650 comprises a resistor body 651, a contact member 652 for contacting the resistor body 651, and an adjustment member connected to the contact member 652. The contact member 652 is electrically connected to one end of the magnetic induction mechanism 300, and one end of the resistor body 651 is electrically connected to one end of the magnetic induction mechanism 300. The resistor body 651 is integrally provided, and the magnitude of the resistance value connected to the resistor body 651 can be changed by the contact between the contact member 652 and the resistor body 651, thereby, Compared to a configuration in which multiple resistors are provided and contact is established via contacts, in this embodiment, by providing arc-shaped contacts continuously on the outer circumference of the resistor body 651, the contact area between the contact member 652 and the resistor body 651 is increased, resulting in higher reliability and easier subsequent changes to the resistance value connected to the resistor body 651. For example, the resistance value connected to the resistor body 651 can be changed by changing the position of the contact points between the contact member 652 and the resistor body 651.

[0077] In other embodiments, the resistor body 651 may be electrically connected at both ends to the ends of the magnetic induction mechanism 300, respectively, and is not limited thereto.

[0078] In this embodiment, the adjustment member includes at least one key 653, the at least one key 653 is connected to a corresponding contact member 652, the contact member 652 is electrically connected to one end of the magnetic induction mechanism 300, and one end of the resistor body 651 is electrically connected to one end of the magnetic induction mechanism 300. As a result, when the at least one key 653 is pressed, the contact member 652 can be electrically connected to the resistor body 651, and consequently, at least a portion of the corresponding resistor body 651 is electrically connected to the magnetic induction mechanism 300 as a load, thereby enabling a change in resistance. By providing the key 653 to enable adjustment of the adjustment mechanism 650, the tactile feel of the adjustment can be made clearer and gear adjustment can be made more reliable.

[0079] In other embodiments, the ends of the resistor body 651 may be electrically connected to the ends of the magnetic induction mechanism 300, respectively, and are not limited thereto.

[0080] In this embodiment, the braking device 10 further includes a support member 654, the support member 654 is provided in a tubular shape, and the resistor body 651 may be provided in a fan-shaped annular shape, and the resistor body 651 is wound around the support member 654, thereby making the structure of the adjustment mechanism 650 compact and reducing the space it occupies.

[0081] In this embodiment, the support member 654 has an opening 6541 for passing wiring to connect the resistor body 651 and the magnetic induction mechanism 300, thereby preventing interference between the wiring and the resistor body 651, as well as short circuits, and improving the safety of the braking device 10.

[0082] In this embodiment, the adjustment mechanism 650 may further include an elastic return assembly, which includes a first limit plate 655 provided on the support member 654, and which provides limiting and springback of the key 653 by a first limit slot 6551 on the first limit plate 655, a first elastic member 6552 between the support member 654 and the first limit plate 655, a limit block 6531 provided on the key 653, and a second elastic member 6532 sleeved on the key 653. Specifically, refer to the elastic return assembly in the third embodiment of the braking device 10 described above, which will not be repeated here.

[0083] Referring to Figure 34, in other embodiments, the number of resistor bodies 651 may be multiple, such as three, and a key 653 is connected to a plurality of corresponding contact members 652 for contacting the corresponding resistor bodies 651, thereby enabling adjustment of the resistance value.

[0084] Referring to Figures 1, 35, and 36, the seventh embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 660. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be repeated here. The adjustment mechanism 660 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0085] In this embodiment, the adjustment mechanism 660 comprises a resistor body 661, a contact member 662 in contact with the resistor body 661, and an adjustment member connected to the contact member 662. The contact member 662 is electrically connected to one end of the magnetic induction mechanism 300, and one end of the resistor body 661 is electrically connected to one end of the magnetic induction mechanism 300. The resistor body 661 is integrally provided, and the magnitude of the resistance value connected to the resistor body 661 can be changed by the contact between the contact member 662 and the resistor body 661. The contact area between the contact member 662 and the resistor body 661 is larger, resulting in higher reliability. Furthermore, it becomes easier to change the magnitude of the resistance value connected to the resistor body 661 thereafter. For example, the magnitude of the resistance value connected to the resistor body 661 can be changed by changing the position of the contact point between the contact member 662 and the resistor body 661.

[0086] In this embodiment, the adjustment member includes at least two keys 663, each connected to a corresponding contact member 662, and each of the at least two keys 663 is provided with a conductive portion 6631. The braking device further includes a connecting portion 6611, which is electrically connected to one end of the magnetic induction mechanism 300, and the resistor body 661 is electrically connected to one end of the magnetic induction mechanism 300. As a result, when one of the at least two keys 663 is pressed, the conductive portion 6631 can be electrically connected to the connecting portion 6611. By providing the keys 663, adjustment of the adjustment mechanism 660 can be achieved, the tactile feel of the adjustment can be made clearer, and gear adjustment can be made more reliable.

[0087] In other embodiments, the ends of the resistor body 661 may be electrically connected to the ends of the magnetic induction mechanism 300, respectively, and are not limited thereto.

[0088] In this embodiment, at least two keys 663 may be arranged at intervals along a straight line, and the resistor body 661 is provided in a straight line. In other embodiments, at least two keys 663 may be arranged along a curve or other linear shape, but are not limited thereto.

[0089] In other embodiments, the adjustment member may include only one key 663, the key 663 having a conductive portion 6631, and the braking device 10 further includes a connecting portion 6611, the connecting portion 6631 being electrically connected to one end of the magnetic induction mechanism 300, and both ends of the resistor body 661 being electrically connected to both ends of the magnetic induction mechanism 300, so that when at least one key 663 is pressed, the conductive portion 6631 can be made electrically connected to the connecting portion 6631, and consequently, at least a portion of the resistor body 661 corresponding to the load can be connected to the magnetic induction mechanism 300, thereby enabling a change in resistance.

[0090] In this embodiment, the braking device 10 may further include an elastic return assembly which acts on at least two keys 663 respectively so that when one of the at least two keys 663 is pressed, the other keys 663 are repelled. Here, the elastic return assembly may include a carrier plate 664 and a first limit plate 665, the specific structure of which can be found by referring to the elastic return assembly in the third embodiment of the braking device 10 described above and will not be repeated here.

[0091] Referring to Figure 37, in other embodiments, the number of resistor bodies 661 may be multiple, such as three, and the multiple resistor bodies 661 are arranged at intervals, and a number of corresponding contact members 662 are connected to the key 663 to contact the corresponding resistor body 661, thereby enabling adjustment of the resistance value.

[0092] Referring to Figures 1, 38, and 39, the eighth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, and an adjustment mechanism 670. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above, and will not be repeated here. The adjustment mechanism 670 is connected to the magnetic induction mechanism 300 and is used to adjust the magnitude of the resistance.

[0093] In this embodiment, the adjustment mechanism 670 may include a sensitive resistor 671, the ends of which are electrically connected to the ends of the magnetic induction mechanism 300, and the sensitive resistor 671 may be a piezo resistor, a photosensitive resistor, a humidity-sensitive resistor, a magnetically sensitive resistor, or a force-sensitive resistor, and its resistance value can be changed by changes in the received voltage, light, humidity, magnetic field strength, or force, thereby enabling a change in resistance. By providing the sensitive resistor 671, adjustment of the adjustment mechanism 670 is achieved, the structure of the adjustment mechanism 670 is simpler, easier to manufacture, occupies less space, and the structure of the braking device 10 becomes more compact.

[0094] In this embodiment, the adjustment mechanism 670 may further include a casing 672, the casing 672 having heat dissipation holes 6721 for dissipating heat from the sensitive resistor 671, thereby avoiding problems such as the resistance value of the sensitive resistor 671 becoming unstable due to temperature rise.

[0095] In this embodiment, the sensitive resistor 671 may be a force-sensitive resistor, and by forming a pressure plate 6722 having a certain elasticity between a plurality of heat dissipation holes 6721, the pressure plate 6722 deforms when subjected to force, transmits the force to the sensitive resistor 671, and enables adjustment of the resistance value of the sensitive resistor 671.

[0096] Referring to Figures 1 and 40, the ninth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, a rectifier mechanism 700, and an adjustment mechanism 680. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the second embodiment of the braking device 10 described above and will not be repeated here. The rectifier mechanism 700 is electrically connected to the magnetic induction mechanism 300 to rectify the current of the magnetic induction mechanism 300, and the adjustment mechanism 680 is connected to the magnetic induction mechanism 300 to adjust the magnitude of the resistance. By providing the rectifier mechanism 700, the outputs of the multiple wires of the magnetic induction mechanism 300 can be rectified, simplifying the structure of the adjustment mechanism 680, making the overall structure of the braking device 10 simpler and more compact, and occupying less space.

[0097] In this embodiment, the magnetic induction mechanism 300 guides at least two wires, and the rectifier mechanism 700 is electrically connected to at least two wires to rectify the current on the at least two wires. The first end of the rectifier mechanism 700 is electrically connected to the first end of the adjustment mechanism 680, and the second end of the rectifier mechanism 700 is electrically connected to the second end of the adjustment mechanism 680, thereby supplying the rectified current to the adjustment mechanism 680, and further allowing the adjustment mechanism 680 to adjust the resistance value connected to the rectifier mechanism 700.

[0098] In this embodiment, the rectifier mechanism 700 may include two first diodes 710 and two second diodes 720. The first ends of the two first diodes 710 are electrically connected to each other and to the first end of the adjustment mechanism 680. The second ends of the two first diodes 710 are electrically connected to two wires, respectively. The first ends of the two second diodes 720 are electrically connected to two wires, respectively. The second ends of the two second diodes 720 are electrically connected to each other and to the second end of the adjustment mechanism 680. This allows the current output by the magnetic induction mechanism 300 to be rectified, for example, AC power output by the magnetic induction mechanism 300 can be rectified to DC power, making the adjustment process of the adjustment mechanism 680 more stable.

[0099] Referring to Figures 41 and 42, in another specific embodiment, the rectifier mechanism 700 may include three first diodes 710 and three second diodes 720, where the first ends of the three first diodes 710 are electrically connected to each other and to the first end of the adjustment mechanism 680, the second ends of the three first diodes 710 are electrically connected to three wires respectively, the first ends of the three second diodes 720 are electrically connected to three wires respectively, and the second ends of the three second diodes 720 are electrically connected to each other and to the second end of the adjustment mechanism 680, thereby rectifying the current output by the magnetic induction mechanism 300, for example, rectifying the three-phase output of the magnetic induction mechanism 300 to a two-phase output, allowing adjustment to be achieved with a single resistor, and simplifying the structure of the adjustment mechanism 680.

[0100] In other embodiments, the rectifier mechanism 70 may include three or more first diodes 710 and second diodes 720, thereby enabling rectification of three or more phase outputs of the magnetic induction mechanism 300, and is not limited thereto.

[0101] In this embodiment, the adjustment mechanism 680 includes a sensitive resistor, the first end of the rectifier mechanism 700 is connected to the first end of the sensitive resistor, and the second end of the rectifier mechanism 700 is connected to the second end of the sensitive resistor. The sensitive resistor can change its resistance value, thereby enabling a change in resistance, and by providing the sensitive resistor, adjustment of the adjustment mechanism 680 can be achieved.

[0102] In other embodiments, the adjustment mechanism 680 may further include an adjustment member and a resistor, for example, as in the second and third embodiments of the braking device 10 described above, or the adjustment mechanism 680 may further include a resistor body, a contact member that slides and contacts the resistor body, and an adjustment member connected to the contact member, for example, as in the fourth, fifth, sixth, and seventh embodiments of the braking device 10 described above, and these will not be described again here.

[0103] Referring to Figures 1, 43, and 44, the tenth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction mechanism 300, an adjustment mechanism 690, a control mechanism 810, and a power storage mechanism 820. The structures of the shaft 100, the housing 200, and the magnetic induction mechanism 300 can be described by referring to the first embodiment of the braking device 10 described above and will not be repeated here. The adjustment mechanism 690 is connected to the magnetic induction mechanism 300 to adjust the magnitude of the resistance, and the control mechanism 810 is connected to the adjustment mechanism 690 and the power storage mechanism 820, respectively. The control mechanism 810 is used to control the adjustment of the resistance of the adjustment mechanism 690, and when the current is above a current threshold, it can supply current to the power storage mechanism 820 for storage. By providing the control mechanism 810, the adjustment mechanism Automatic adjustment of 690 can be achieved, further improving the intelligence of the braking device 10, expanding the range of application of the braking device 10, and by providing a power storage mechanism 820 to store current, and supplying current to the control mechanism 810 when the power supplied by the magnetic induction mechanism 300 is insufficient, the reliability of the braking device 10 is increased and safety is improved.

[0104] In this embodiment, a casing 691 may be provided, and the adjustment mechanism 690, the control mechanism 810, and the power storage mechanism 820 may all be provided within the casing 691.

[0105] In this embodiment, the control mechanism 810 comprises a main controller 811 and a power supply controller 812. The main controller 811 is connected to the adjustment mechanism 690, and the power supply controller 812 is connected to the main controller 811 as well as to the magnetic induction mechanism 300 and the power storage mechanism 820, respectively. The power supply controller 812 receives the current supplied by the magnetic induction mechanism 300 and is used to supply at least a portion of the current to the main controller 811, thereby maintaining the normal operation of the main controller 811, and when the current is above a current threshold, it supplies another portion of the current to the power storage mechanism 820 to achieve power storage.

[0106] In this embodiment, the braking device 10 may further include a speed detection mechanism (not shown), which is connected to a control mechanism 810 via wiring 813. The speed detection mechanism is used to detect the rotational speed of the housing 200, and the control mechanism 810 is used to control the adjustment of the resistance of the adjustment mechanism 690 based on the rotational speed, thereby making the braking device 10 more intelligent.

[0107] In this embodiment, the speed detection mechanism may be provided on the housing 200 or on the braking device 10. The speed detection mechanism may be a pressure sensor, image sensor, photoelectric sensor, etc., and can detect the rotational speed of the housing 200 based on the magnitude of the received pressure, image, video, or light ray.

[0108] In this embodiment, the adjustment mechanism 690 may include a resistor body and a contact member (not shown) that slides and contacts the resistor body. The first end of the magnetic induction mechanism 300 is connected to the first end of the resistor body, the second end of the magnetic induction mechanism 300 is connected to the contact member, or the second end of the magnetic induction mechanism 300 is connected to both the contact member and the second end of the resistor body. The control mechanism 810 can change the resistance value of the resistor body connected to the magnetic induction mechanism 300 by controlling the sliding of the contact member relative to the resistor body. Specifically, the structure of the adjustment mechanism 690 can be described by referring to the fourth, fifth, sixth, and seventh embodiments of the braking device 10 described above, and will not be repeated here.

[0109] In other embodiments, the adjustment mechanism 690 may further include at least one resistor and an adjustment member, the first end of at least one resistor being connected to the first end of the magnetic induction mechanism 300, the adjustment member being connected to the second end of the magnetic induction mechanism 300, and the control mechanism 810 controlling the connection between the adjustment member and the first or second end of at least one resistor to change the total resistance value of the resistor connected to the magnetic induction mechanism 300. Specifically, the structure of the adjustment mechanism 690 can be described by referring to the second and third embodiments of the braking device 10 described above, and will not be repeated here.

[0110] In other embodiments, the adjustment mechanism 690 may further include a sensitive resistor and an adjustment member (not shown), the ends of the magnetic induction mechanism 300 being connected to the ends of the sensitive resistor, and the control mechanism 810 controlling the adjustment member so that the adjustment member changes the resistance value of the sensitive resistor connected to the magnetic induction mechanism 300.

[0111] Referring to Figures 45 and 46, in other embodiments, the braking device 10 may further include a rectifier mechanism 700, which is connected to the magnetic induction mechanism 300 and the adjustment mechanism 690, respectively, and is used to rectify the current output by the magnetic induction mechanism 300. Here, the structure of the rectifier mechanism 700 can be described by referring to the ninth embodiment of the braking device 10 described above, and will not be described again here.

[0112] In this embodiment, the rectifier mechanism 700 rectifies at least two wires introduced from the magnetic induction mechanism 300, then leads to two wires which are electrically connected to both ends of the adjustment mechanism 690. In other embodiments, instead of providing the rectifier mechanism 700, three sets of resistors, resistor bodies, or sensitive resistors may be directly provided in the adjustment mechanism 690 and electrically connected to the three wires led from the magnetic induction mechanism 300. For specifics, refer to the above-described embodiment of the braking device 10, which will not be repeated here.

[0113] Referring to Figures 1, 2 and 47, the eleventh embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction member 310, and a magnet assembly 320, wherein the housing 200 is sleeved on the shaft 100 and is arranged coaxially with the shaft 100, the housing 200 is rotatable relative to the shaft 100, a coil 311 is wound around the magnetic induction member 310, and the magnet assembly 320 comprises a plurality of magnets arranged at intervals along the circumferential direction of the shaft 100, where one of the magnetic induction member 310 and the magnet assembly 320 is connected to the shaft 100 and the other to the housing 200 The magnetic induction member 310 and / or magnet assembly 320 are connected to the shaft 100 or housing 200, so that when the housing 200 rotates relative to the shaft 100, the coil 311 can disconnect the magnetic field formed by the magnet assembly 320, generating resistance opposite to the direction of rotation of the housing 200 or shaft 100. Furthermore, the magnitude of the resistance can be changed by replacing the magnetic induction member 310 and / or magnet assembly 320, thereby adapting to the needs of different users and different environments and broadening the range of application of the braking device 10.

[0114] In this embodiment, the braking device 10 may further include a support 330, which is detachably connected to the inside of the housing 200, and a plurality of mounting grooves 331 are formed inside the support 330, and the plurality of magnets of the magnet assembly 320 are each provided in the plurality of mounting grooves 331, and by replacing the support 330 and the magnet assembly 320 supported on the support 330, the number, size and arrangement structure of the magnets in the magnet assembly 320 can be changed, thereby changing the magnetic field generated by the magnet assembly 320, and further changing the resistance generated by the interaction between the magnetic induction member 310 and the magnet assembly 320, thereby achieving resistance adjustment.

[0115] In this embodiment, the support 330 is provided with a first limit portion, and the housing 200 is provided with a second limit portion. The first and second limit portions work together to limit the support 330, preventing the support 330 from rotating relative to the housing 200 during the rotation process of the housing 200. This makes the magnetic field generated by the magnet assembly 320 more stable, and consequently, the resistance generated by the interaction between the magnetic induction member 310 and the magnet assembly 320 becomes more stable.

[0116] In this embodiment, the first limit portion may be a limit slot 332, and the second limit portion may be a limit projection 210. The limit projection 210 and the limit slot 332 extend along the axial direction of the housing 200, thereby providing a limit on the support 330 along the circumferential direction of the shaft 100. The structure is simple, easy to manufacture, and highly reliable.

[0117] In other embodiments, the first limit portion may be a limit projection, and the second limit portion may be a corresponding limit slot; however, these are not limited to the embodiments described herein.

[0118] In this embodiment, the braking device 10 may further include a fixing ring 340, which covers one end of the support 330 and is used to hold the magnet assembly 320 in the mounting groove 331, thereby providing a limit on the magnet assembly 320 along the axial direction of the shaft 100 and preventing the magnets of the magnet assembly 320 from coming out of the mounting groove 331.

[0119] Referring to Figures 1, 2 and 48, the twelfth embodiment of the braking device 10 of the present invention comprises a shaft 100, a housing 200, a magnetic induction member 310, and a magnetic induction assembly 320. The housing 200 is sleeved over the shaft 100 and is coaxially positioned with the shaft 100. The housing 200 is rotatable relative to the shaft 100. A coil 311 is wound around the magnetic induction member 310. The magnet assembly 320 comprises a plurality of magnets spaced apart along the circumferential direction of the shaft 100. Here, one of the magnetic induction member 310 and the magnet assembly 320 is connected to the shaft 100, and the other... The coil 311 is connected to the housing 200, and the magnetic induction member 310 and / or magnet assembly 320 are detachably connected to the shaft 100 or the housing 200. As the housing 200 rotates relative to the shaft 100, the coil 311 disconnects the magnetic field formed by the magnet assembly 320, generating resistance opposite to the direction of rotation of the housing 200. The magnitude of the resistance can be changed by replacing the magnetic induction member 310 and / or magnet assembly 320, thereby adapting to the needs of different users and different environments and broadening the range of application of the braking device 10.

[0120] In this embodiment, the braking device 10 may further include a fixing member 110, which is fixed on the shaft 100, and the magnetic induction member 310 is detachably connected to the fixing member 110. This allows the magnetic induction member 310 to be disassembled from the shaft 100 and replaced to change the number, size, and arrangement of magnets in the magnet assembly 320, thereby changing the magnetic field generated by the magnet assembly 320, and further changing the resistance generated by the interaction between the magnetic induction member 310 and the magnet assembly 320, thereby enabling resistance adjustment.

[0121] In this embodiment, the fixing member 110 is provided with a first connecting portion, and the magnetic induction member 310 is provided with a second connecting portion. The first and second connecting portions work together to connect the fixing member 110 and the magnetic induction member 310, preventing the magnetic induction member 310 from rotating relative to the shaft 100 during the rotation of the housing 200. This makes the interaction between the magnetic induction member 310 and the magnet assembly 320 more stable, and consequently, the generated resistance more stable.

[0122] Referring also to Figure 49, in this embodiment, the first connecting portion may be a connecting groove 111, and the second connecting portion may be a connecting projection 314. The connecting projection 314 has a first connecting hole 315, and the connecting groove 111 has a second connecting hole 112. Thus, the connecting projection 314 and the connecting groove 111 are connected in cooperation and then fixed by a connecting member (not shown) that passes through the first connecting hole 315 and the second connecting hole 112. This structure is simple, easy to manufacture, and highly reliable.

[0123] In this embodiment, the opening direction of the connecting groove 111 may be provided parallel to the circumferential direction of the shaft 100, thereby facilitating the snap fastening of the magnetic induction member 310 together with the fixing member 110 after it has been sleeved onto the shaft 100.

[0124] In other embodiments, the opening direction of the connecting groove 111 may be further provided parallel to the axial direction of the shaft 100, thereby facilitating the direct snapping of the magnetic induction member 310 together with the fixing member 110 along the axial direction of the shaft 100.

[0125] In this embodiment, the first connection hole 315 and the second connection hole 112 may both be threaded holes, and the connecting member may be a screw.

[0126] In other embodiments, the first connecting portion may be a connecting protrusion, and the second connecting portion may be a corresponding connecting groove; however, it is not limited to these embodiments.

[0127] In other embodiments, the fixing member 110 and the magnetic induction member 310 may be connected by other detachable mechanisms such as snaps, but are not limited herein.

[0128] In other embodiments, the magnetic induction member 310 and the magnet assembly 320 may both be detachable, and specific structures can be found in the 11th and 12th embodiments of the braking device 10 described above, and are not limited thereto.

[0129] Referring to Figures 1 and 2, the first embodiment of the wheel body assembly of the present invention includes a braking device 10, and the structure of the braking device 10 can be described by referring to the above embodiment of the braking device 10, and will not be described again here.

[0130] Here, the housing 200 of the braking device 10 can be used as the wheel body of an assembly of wheel bodies arranged in an annular shape. The braking device 10 can achieve a braking effect by directly generating resistance against the wheel body. Since its braking force is related to the rotation of the housing 200 and not friction braking, it does not cause an emergency stop effect, is safer, reduces wear, extends the service life of the braking device 10, and has a simple structure, making it easy to manufacture.

[0131] Referring to Figure 50, a second embodiment of the wheel body assembly of the present invention comprises a braking device 10 and a wheel body 20, the wheel body 20 being connected to the housing 200 or shaft 100 of the braking device 10, and the braking device 10 generates resistance against the wheel body by the housing 200 or shaft 100 to achieve a braking effect.

[0132] In this embodiment, the braking device 10 and the wheel body 20 can be detachably connected, allowing the user to choose whether or not to install the braking device 10 as needed, thereby broadening the range of application.

[0133] In this embodiment, since the braking device 10 can be directly connected to the wheel body 20 by the connecting rod 201, the braking effect on the wheel body 20 can be directly realized.

[0134] In other embodiments, the braking device 10 can be connected to the wheel body 20 by a transmission device (not shown), thereby adapting to different braking needs and expanding the range of application.

[0135] Referring to Figure 51, the first embodiment of the walking aid of the present invention comprises a braking device 10 and a main frame 30, the braking device 10 being rotatably connected to the bottom of the main frame 30 and used to move together with the main frame 30 and / or to drive the movement of the main frame 30. In this embodiment, there are two braking devices 10, which are used as the front wheels of the walking aid, and the walking aid further comprises two swivel wheels 40 as rear wheels. By using the braking devices 10 as the front wheels, the steering operation of the walking aid can be made more energy-efficient, and by using the swivel wheels 40 as the rear wheels, the swivel wheels 40 can be easily rotated flexibly together with the steering of the main frame 30.

[0136] In other embodiments, by using two brake devices 10 as rear wheels (not shown) and two swivel wheels 40 as front wheels, the problem of the brake device 10 generating too much instantaneous resistance causing the vehicle to tip over or roll over can be avoided.

[0137] In other embodiments, the number of braking devices 10 may be four, meaning they can be used as both the front and rear wheels of the walking aid, further improving the braking effect.

[0138] In this embodiment, when the housing 200 of the braking device 10 rotates relative to the shaft 100, the coil 311 cuts the magnetic field formed by the magnet assembly 320, generating resistance opposite to the direction of rotation of the housing 200, thereby performing a braking function on the braking device 10. Furthermore, since the braking force is related to the rotation of the housing 200 and not frictional braking, it does not cause an emergency stop effect, resulting in higher safety, reduced wear, and a longer service life for the braking device 10. At the same time, its structure is simple and easy to manufacture.

[0139] Referring to Figure 52, a second embodiment of the walking aid of the present invention comprises a braking device 10 and a main frame 50, wherein the braking device 10 is rotatably connected to the bottom of the main frame 50 and is used to move together with the main frame 50 and / or to drive the movement of the main frame 50.

[0140] In this embodiment, the braking device 10 can function as either the front wheel or the rear wheel of the walking aid, and specifically refer to the first embodiment of the walking aid described above, which will not be repeated here.

[0141] In this embodiment, when the housing 200 of the braking device 10 rotates relative to the shaft 100, the coil 311 cuts the magnetic field formed by the magnet assembly 320, generating resistance opposite to the direction of rotation of the housing 200, thereby performing a braking function on the braking device 10. Furthermore, since the braking force is related to the rotation of the housing 200 and not frictional braking, it does not cause an emergency stop effect, resulting in higher safety, reduced wear, and a longer service life for the braking device 10. At the same time, its structure is simple and easy to manufacture.

[0142] In other embodiments, the braking device 10 can also be applied to other types of walking aids, and is not limited thereto.

[0143] The above describes only embodiments of the present invention and does not limit the scope of the patent. Equivalent structural or process transformations made using the specifications and drawings of the present invention, or equivalent structural or process transformations directly or indirectly applied in other related technical fields, are all similarly included within the scope of the patent protection of the present invention.

Claims

1. The shaft and, A housing that is sleeved to the shaft and arranged coaxially with the shaft, and is rotatable relative to the shaft, A magnetic induction mechanism provided within the housing, which generates resistance in the housing in the opposite direction to the rotation direction of the housing, or generates resistance in the shaft in the opposite direction to the rotation direction of the shaft, by magnetic field reaction when the housing is rotated relative to the shaft. The magnetic induction mechanism is connected to an adjustment mechanism used to adjust the magnitude of the resistance, The adjustment mechanism comprises an adjustment member and at least one resistor, the adjustment member being electrically connected to the magnetic induction mechanism, the adjustment member having a first connection portion, and at least one of the resistors having a second connection portion at one end, and the adjustment member being movable relative to the resistor so that the first connection portion can be electrically connected to the second connection portion, The braking device further comprises a first support tube, at least one resistor provided on the first support tube, the adjusting member is provided in a ring shape and rotatable relative to the first support tube, the first connecting portion is formed in a groove on the outer circumference of the adjusting member, the outer surface of the adjusting member is insulated except for the groove, the groove is conductive, the second connecting portion includes a contact member and a first elastic member, the contact member is electrically connected to the resistor, and the first elastic member is used to provide elastic force to the contact member so that the contact member contacts the outer circumference of the adjusting member. A braking device characterized by the following:

2. An annular groove is formed on the outer circumference of the adjustment member, the first connecting portion is recessed relative to the annular groove, and the end of the contact member is provided to protrude in an arc shape. The braking device according to feature 1.

3. The device further comprises a second support tube and a knob connected to the second support tube, wherein the second support tube is nested with the first support tube, and the adjustment member is provided on the second support tube so that the adjustment member can rotate together with the knob. The braking device according to feature 1.

4. The device further comprises a casing, the adjustment member and the resistor being housed within the casing, an opening being formed at one end of the casing away from the knob, the opening being polygonal in shape, and a limit member and a second elastic member being provided at one end of the second support tube away from the knob, the second elastic member being used to provide elastic force to the limit member so that the limit member can contact the casing during the rotation of the second support tube. The braking device according to feature 3.

5. The opening includes a plurality of receiving ports arranged at intervals along the circumferential direction of the first support pipe, and when the limit member is rotated to the receiving ports, the compression distance of the second elastic member becomes 0, causing the limit member to move away from the casing, or the limit member to contact the casing and the force acting on the casing becomes 0, and when the limit member is rotated between the two receiving ports, the limit member to contact the casing and the force acting on the casing becomes greater than 0 The braking device according to feature 4.

6. The shaft and, A housing that is sleeved to the shaft and arranged coaxially with the shaft, and is rotatable relative to the shaft, A magnetic induction mechanism provided within the housing, which generates resistance in the housing in the opposite direction to the rotation direction of the housing, or generates resistance in the shaft in the opposite direction to the rotation direction of the shaft, by magnetic field reaction when the housing is rotated relative to the shaft. A braking device comprising: an adjustment mechanism connected to the magnetic induction mechanism and used to adjust the magnitude of the resistance, Further comprising a first support pipe, The adjustment mechanism comprises an adjustment member and at least one resistor, the number of resistors being multiple, the multiple resistors forming multiple resistor groups, each resistor group containing at least three resistors, at least three of the resistors in each resistor group being located in the same plane perpendicular to the axial direction of the first support tube, the multiple resistor groups being spaced apart along the axial direction of the first support tube, the number of adjustment members being multiple and the same as the number of resistor groups, the multiple adjustment members being spaced apart along the axial direction of the first support tube and corresponding one-to-one with each resistor group. A braking device characterized by the following:

7. The shaft and, A housing that is sleeved to the shaft and arranged coaxially with the shaft, and is rotatable relative to the shaft, A magnetic induction mechanism provided within the housing, which generates resistance in the housing in the opposite direction to the rotation direction of the housing, or generates resistance in the shaft in the opposite direction to the rotation direction of the shaft, by magnetic field reaction when the housing is rotated relative to the shaft. A braking device comprising: an adjustment mechanism connected to the magnetic induction mechanism and used to adjust the magnitude of the resistance, The adjustment mechanism comprises an adjustment member and at least one resistor, the adjustment member comprising at least one key, the key having a conductive portion, the braking device further comprising a first connection portion and a second connection portion spaced apart, the first connection portion and the second connection portion being electrically connected to both ends of the magnetic induction mechanism, at least one resistor being electrically connected to the first connection portion, and the key being able to be pressed so that the conductive portion makes electrical contact between the first connection portion and the second connection portion. A braking device characterized by the following:

8. The adjustment member includes at least two of the keys, each key having a conductive portion, and the number of first and second connections is at least two, the two first connections being connected to the ends of at least one resistor, and when one of the at least two keys is pressed, the conductive portion can conduct electricity to at least one of the two first connections and the corresponding second connection; the adjustment mechanism further includes an elastic return assembly, the elastic return assembly acting on at least two of the keys, respectively, so that when one of the at least two keys is pressed, the other keys are retracted. The braking device according to feature 7.

9. At least two of the keys are arranged in a straight or curved interval. The braking device according to feature 8.

10. The key includes a key body and a button provided at one end of the key body, the conductive portion is provided at the other end of the key body, the elastic return assembly includes a carrier plate and a first limit plate, the first limit plate has an "L" shaped first limit slot formed therein, the first limit plate includes a limit portion corresponding to the first limit slot, a first elastic member is provided between the carrier plate and the first limit plate, the key body is further provided with a limit block, the limit block is used in cooperation with the first limit slot to set a limit, and the key body is sleeved with a second elastic member. The braking device according to feature 8.

11. The first limit plate is further provided with a receiving groove, and the carrier plate is provided with a contact column, and the first elastic member and the contact column are housed in the receiving groove, and the contact column is used to contact the first elastic member, or The first elastic member is provided at one end of the first limit plate and is used to abut against the inner wall of the carrier plate. The braking device according to feature 10.

12. A second limit slot is further formed in the carrier plate, and the limit block can be housed within the second limit slot in cooperation with the second limit slot to apply a limit. The braking device according to feature 10.

13. The elastic return assembly further includes a plurality of second limit plates, the plurality of second limit plates arranged sequentially along the extending direction of the first limit plate, the space between two adjacent second limit plates is used to form a third limit slot, the third limit slot cooperates with the limit block to apply a limit. The braking device according to feature 10.

14. The first limit plate is provided with an inclined surface corresponding to the first limit slot, and / or An inclined surface is formed on the second limit plate. The braking device according to feature 13.

15. The shaft and, A housing that is sleeved to the shaft and arranged coaxially with the shaft, and is rotatable relative to the shaft, A magnetic induction mechanism provided within the housing, which generates resistance in the housing in the opposite direction to the rotation direction of the housing, or generates resistance in the shaft in the opposite direction to the rotation direction of the shaft, by magnetic field reaction when the housing is rotated relative to the shaft. The magnetic induction mechanism is connected to an adjustment mechanism used to adjust the magnitude of the resistance, The adjustment mechanism comprises an adjustment member and at least one resistor, the adjustment member comprising at least one key, the key having a conductive portion, one end of the resistor connected to one end of the magnetic induction mechanism via a first connection portion, the other end of the resistor connected to the other end of the magnetic induction mechanism via a second connection portion, and the key can be pressed such that the conductive portion connects the first connection portion and the second connection portion to short-circuit the resistor. A braking device characterized by the following:

16. The braking device is provided as described in claim 1, and the housing is provided in an annular shape for use as a wheel body. A wheel body assembly characterized by the following features.

17. The device comprises a main frame and a wheel body assembly as described in claim 16, wherein the wheel body assembly is rotatably connected to the bottom of the main frame. A walking aid characterized by the following features.

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