In-wheel motor

Abstract

To provide an in-wheel motor capable of suppressing the thickness of a casing while arranging a transmission means and a braking means in addition to a motor in the casing.SOLUTION: The in-wheel motor 10 comprises a stator 14 fixed to a main shaft 12 and provided with a coil 18, a rotor 44 having a yoke 42a opposed to the coil 18 and provided rotatably around the main shaft 12 as a base point, a wheel 50 constituting an outer shell, and a speed change means for transmitting a rotating force by the rotor 44 to the wheel 50, wherein a braking means is arranged together with the speed change means between the stator 14 and the rotor 44 opposed to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor, and more particularly to an in-wheel motor in which a motor is disposed inside a wheel of a vehicle. [Background technology]

[0002] Known in-wheel motors used in electric vehicles such as wheelchairs and carts include those disclosed in Patent Documents 1 and 2. The in-wheel motor disclosed in Patent Document 1 is configured to include a motor, a reducer, and a brake inside a casing that forms the wheel. Therefore, simply by equipping an electric vehicle with an in-wheel motor configured as disclosed in Patent Document 1, it is possible for the electric vehicle to perform both driving and braking functions.

[0003] However, the in-wheel motor disclosed in Patent Document 1 is a so-called cored motor, which requires that each element be stacked in the axial direction. Therefore, if these elements are arranged inside a casing, the thickness of the casing will be much thicker than that of the tire. In particular, the in-wheel motor disclosed in Patent Document 1 has a rotating shaft, and therefore employs a clutch mechanism between the electromagnetic brake and the mounting shaft, which further increases the axial length and complicates the structure.

[0004] On the other hand, the applicant of the present application has proposed a structure in which an in-wheel motor employs a coreless motor, in which a reducer is placed in the gap formed in the rotor, thereby reducing the thickness of the casing, as disclosed in Patent Document 2. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-116888 [Patent Document 2] Patent Publication No. 2021-13245 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, in consideration of the above-described conventional in-wheel motors, the present invention aims to provide an in-wheel motor that can accommodate a motor, a speed change means, and a braking means in a casing while reducing the thickness of the casing (thickness in the axial direction that is the center of rotation). [Means for solving the problem]

[0007] In order to achieve the above object, the in-wheel motor of the present invention comprises a stator fixed to a main shaft and equipped with a cylindrical coil, a rotor having a permanent magnet arranged opposite the cylindrical coil and rotatable about the main shaft, a wheel forming an outer shell, and a speed change means for transmitting rotational force of the rotor to the wheel, characterized in that braking means are arranged together with the speed change means on the inner peripheral side of the cylindrical coil between the opposing stator and rotor.

[0008] Furthermore, in an in-wheel motor having the above-mentioned features, the braking means may be a non-excitation type electromagnetic brake having a base brake plate arranged opposite the armature via the brake rotor, and a brake release plate arranged between the base brake plate and the armature, and a cam mechanism may be provided between the base brake plate and the armature, so that when the electromagnetic brake is in a braking state, the cam mechanism is actuated by moving the brake release plate in a direction along a plate surface to push back the armature. With these features, it is possible to release the braking of the electromagnetic brake by applying a movement of the brake release plate along the plate surface.

[0009] Furthermore, an in-wheel motor having the above-described features may preferably include biasing means for generating a reaction force when a force for moving the brake release plate in a direction along the plate surface is applied to the brake release plate, and for returning the brake release plate to its initial state after the force is released. By having such features, the force applied to the brake release plate can be limited to one direction, which makes it possible to simplify the control system.

[0010] In the in-wheel motor having the above-mentioned features, the cam mechanism can be configured with an inclined surface and a roller. By having such features, the cam mechanism can be simplified in structure.

[0011] In addition, in an in-wheel motor having the above-described characteristics, it is preferable that the movement of the brake release plate is a rotational movement around the center of rotation of the rotor. With this characteristic, there is no change in the projection surface when viewed from above before and after the movement of the brake release plate, making it possible to achieve a compact structure.

[0012] Furthermore, the in-wheel motor having the above-mentioned features may further comprise brake release means for applying a force for rotation to the brake release plate, the brake release means comprising an actuating lever engaged with the brake release plate, a rotating shaft having one end engaged with the actuating lever and the other end exposed to the outside of the wheel via the stator, and a release lever engaged with the other end of the rotating shaft. With these features, it becomes possible to control brake release from outside the in-wheel motor. [Effects of the Invention]

[0013] With an in-wheel motor having the above-described characteristics, it is possible to arrange the motor, transmission means, and braking means inside the casing while keeping the thickness of the casing (thickness in the axial direction around the center of rotation) small. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing a cross-sectional configuration of an in-wheel motor according to an embodiment. [Figure 2] FIG. 2 is a plan view showing the arrangement of planetary gears that constitute the transmission means according to the embodiment. [Figure 3] 1 is a plan view showing a base plate constituting a braking means according to an embodiment, and an arrangement of a torsion spring relative to the base plate. FIG. [Figure 4] FIG. 2 is a plan view showing the configuration of a base braking plate that constitutes the braking means according to the embodiment. [Figure 5] FIG. 2 is a plan view showing the configuration of a brake release plate and a brake rotor that constitute the braking means according to the embodiment. [Figure 6] FIG. 2 is a plan view showing the configuration of an armature that constitutes the braking means according to the embodiment. [Figure 7] 4 is a cross-sectional view showing a state in which power is supplied to a magnetic excitation unit (non-braking state) in the braking means according to the embodiment. FIG. [Figure 8] 4 is a cross-sectional view showing a state (braking state) in which no power is supplied to a magnetic excitation unit in the braking means according to the embodiment. FIG. [Figure 9] 10 is a cross-sectional view showing a state in which the brake release plate is moved (brake released state) in the braking means according to the embodiment, with no power being supplied to the magnetic excitation unit. FIG. [Figure 10] FIG. 1 is a side view showing an example in which an in-wheel motor according to an embodiment is applied to a wheelchair. [Figure 11] 11 is a diagram showing the wheel as viewed from the direction of arrow D in FIG. 10. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of an in-wheel motor according to the present invention will be described in detail with reference to the drawings. Note that the embodiments described below are only some of the ways in which the present invention can be implemented. Therefore, even if some of the configuration is changed, it can be considered as part of the present invention as long as the effects of the invention are achieved.

[0016] [composition] First, the configuration of an in-wheel motor 10 according to this embodiment will be described with reference to Figs. 1 to 6. Fig. 1 is a schematic diagram showing a cross-sectional configuration of the in-wheel motor according to this embodiment. Fig. 2 is a plan view showing the arrangement of planetary gears that constitute the transmission means according to this embodiment. Fig. 3 is a plan view showing the arrangement of base plates that constitute the braking means according to this embodiment and the arrangement of torsion springs relative to the base plates. Fig. 4 is a plan view showing the arrangement of base braking plates that constitute the braking means according to this embodiment. Fig. 5 is a plan view showing the arrangement of a brake release plate and brake rotor that constitute the braking means according to this embodiment. Fig. 6 is a plan view showing the arrangement of an armature that constitutes the braking means according to this embodiment.

[0017] The in-wheel motor 10 according to this embodiment is basically composed of a main shaft 12, a stator 14 fixed to the main shaft 12, a rotor 42 that rotates around the main shaft 12, and a wheel 50 that forms the outer shell of the stator 14 and the rotor 42.

[0018] The main shaft 12 is a shaft for attaching the in-wheel motor 10 according to the embodiment to a vehicle, a vehicle body, or the like, and is a non-rotating shaft that serves as the center of rotation of a rotor 42 and a wheel 50, which will be described in detail later.

[0019] The stator 14 is an element fixed to the main shaft 12, and has coils 18, planetary gears 20 (part of the speed change means), braking means 22, etc. arranged around a base 16. The base 16 is fixed to the main shaft 12, with a portion of it exposed to the inner side of the entire in-wheel motor 10, and also serves as an input section for drawing power supply means (not shown), manual braking release means 40, etc. into the interior of the in-wheel motor 10.

[0020] Base 16 is basically composed of boss 16a fixed to main shaft 12 and flange 16b formed in a disk shape with boss 16a as the base point, and flange 16b has coil 18, planetary gear 20, and braking means 22 arranged on flange 16b. Coil 18 is a three-phase coil formed in a cylindrical shape, and when power is supplied, it generates power to rotate rotor 42, the details of which will be described later. Coil 18 is erected near the outer periphery of flange 16b, with its free end located on the tip side of main shaft 12.

[0021] The speed change means is an element that changes (specifically, reduces) the rotational speed of the rotor 42 and changes (specifically, increases) the rotational force, i.e., torque, transmitted to the wheel 50, which will be described in detail later. In this embodiment, a planetary gear 20 that constitutes the speed change means is arranged on the flange 16b inside the coil 18. This arrangement is possible because the in-wheel motor 10 according to this embodiment is a coreless motor that has a space inside the rotor 42. The speed change means according to this embodiment is what is known as a planetary gear. Specifically, it includes a sun gear 48 that is attached to the rotor 42, which will be described in detail later, and that is rotatable around the main shaft 12, multiple planetary gears 20 arranged around the sun gear 48, and a planetary carrier (internal gear) 52a that is arranged on the wheel 50, which will be described in detail later. It is the planetary gear 20 that is arranged on the flange 16b. The planetary gear 20 according to this embodiment is a two-stage gear. The larger gear (gear with more teeth) 20a receives rotation from the sun gear 48, and the smaller gear (gear with fewer teeth) 20b transmits the rotation to the planetary carrier 52a. This enables greater speed change and increased torque. The planetary gear 20 according to this embodiment is disposed so that its rotation axis passes through the flange 16b. With the flange 16b as the base point, the gear 20a with more teeth is located at the tip end of the main shaft, and the gear 20b with fewer teeth is located at the base end of the main shaft. This configuration allows the final rotation mechanism (the wheel 50 in this embodiment) to be located outside the rotor 42. The planetary gear 20, which is part of the speed-changing means disposed in this manner, is enclosed in a gear case 20c, which is configured to prevent lubricants and the like from splashing.

[0022] The braking means 22 is disposed so as to be located closer to the tip end of the main shaft 12 than the speed change means, with the gear case 20c as the base point. The braking means 22 according to this embodiment is basically composed of a non-excitation operated electromagnetic brake 24 and a brake release means 40.

[0023] The electromagnetic brake 24 of this embodiment has a five-layer structure including a base plate 26, a base braking plate 28, a brake release plate 30, an armature 32, and an excitation section 34, and a brake rotor 36 is arranged between the base braking plate 28 and the armature 32, on the inner peripheral side of the brake release plate 30.

[0024] The base plate 26, shown in plan view in FIG. 3, is a polygonal plate disposed on the upper portion of the gear case 20c (the side of the tip of the main shaft). It has a through-hole 26a that fits over the boss 20c1 of the gear case 20c and a through-hole 26b through which the main shaft 12 passes, as well as a torsion spring 38 and a spacer 26c. The torsion spring 38 is an element (biasing means) that applies a biasing force to the brake release plate 30, which will be described in detail later. Specifically, the biasing force is the reaction force generated when the torsion spring 38 is bent by operating the operating lever 40a of the brake release means 40 in the direction of arrow A. The spacer 26c is an element that creates a gap between the base plate 26 and the base brake plate 28, which is stacked on the base plate 26, allowing the torsion spring 38 to operate.

[0025] The base brake plate 28 is an element that generates friction between itself and the brake rotor 36, which will be described in detail later, when pressed against it, thereby stopping rotation, and that supports and protrudes rollers (balls) 28a held by the brake release plate 30, which will be described in detail later. The base brake plate 28 is a plate member that is disposed on the upper surface of the base plate 26 (the tip side of the main shaft 12) via a spacer 26c, and its surface (the surface located on the tip side of the main shaft 12) is provided with multiple (at least three) recesses 28b on a circumference that is centered on the main shaft 12. The recesses 28b are elements into which the rollers 28a held by the brake release plate 30 are inserted, and the rollers 28a protrude from the recesses 28b to push the armature 32, which will be described in detail later, back toward the excitation unit 34. For this reason, it is desirable that the recesses 28b be configured to be inclined in the rolling direction of the rollers 28a. This is to make it gentler to roll the rollers 28a and to generate a force that pushes back the armature 32. Furthermore, the base braking plate 28 according to this embodiment is provided with a plurality of support posts 28c (three in the embodiment shown in FIG. 4) for guiding the brake release plate 30.

[0026] The brake release plate 30 is an element that functions to push the rollers 28a, which are inserted in the recesses 28b of the base brake plate 28, out of the recesses 28b. For this reason, the brake release plate 30 is disposed on a surface of the base brake plate 28 that is located on the tip side of the main shaft 12. The brake release plate 30 is an annular plate, and the brake rotor 36 attached to the rotor 42 is disposed on its inner periphery. The brake rotor 36 generates a braking force by being sandwiched between the base brake plate 28 and an armature 32, which will be described in detail later. For this reason, the thickness of the brake release plate 30 is configured to be thinner than the thickness of the brake rotor 36. When the brake release plate 30 is rotated with the balls that form the rollers 28a disposed in the through holes 30a, the side walls of the through holes 30a act as guides to push (protrude) the rollers 28a out of the recesses 28b.

[0027] For this reason, the brake release plate 30 needs to be configured to be rotatable in a predetermined direction (the direction indicated by arrow C) with the main shaft 12 as the base point. Here, the brake release plate 30 is supported by the support columns 28c arranged on the base brake plate 28, and this support state needs to allow the brake release plate 30 to rotate. In this embodiment, notches 30b shaped along the arc of a circle passing outside the multiple support columns 28c arranged circumferentially with the main shaft 12 as the base point are provided in accordance with the arrangement positions of the support columns 28c. With this configuration, the brake release plate 30 can rotate along a circle tangent to the outer periphery of the multiple support columns 28c within the range of the length of the arc-shaped notch.

[0028] Furthermore, the brake release plate 30 according to this embodiment is formed with an input protrusion 30c for inputting a rotational force to the brake release plate 30. The input protrusion 30c may be any plate piece that protrudes toward the outer periphery of the annulus that forms the brake release plate 30, and in this embodiment, the tip of the input protrusion 30c is provided with a notch 30b1 for engaging with the operating lever 40a of the brake release means 40. It is preferable that the brake rotor 36 is configured so that its circumferential movement is regulated to match the movement of the rotor 42, but that it is free to move in the axial direction of the main shaft 12. This is to enable the brake rotor 36 to be sandwiched between the base brake plate 28 and the armature 32 and to ensure a small gap after braking is released.

[0029] The armature 32 is an element that sandwiches the brake rotor 36 between itself and the base brake plate 28 to generate a braking force. The armature 32 according to this embodiment is supported so as to be freely slidable in the thickness direction along support posts 28c arranged on the base brake plate 28, and is pressed against the brake rotor 36 from the excitation part 34 as a base point by the action of a torque spring 24b arranged on the outer periphery of the excitation part 34. The armature 32 is a disk-shaped plate piece made of a magnetic metal, and has a through hole 32a in its center through which the main shaft 12 passes, and a plurality of notches 32b on its outer periphery through which the support posts 28c pass.

[0030] The excitation unit 34 is an element for moving the above-mentioned armature 32 in the thickness direction (axial direction of the main shaft 12). Inside the excitation unit 34, there are disposed a coil 34a that generates a magnetic field and a torque spring 34b that presses the armature 32 against the brake rotor 36 in a non-excited state. With this configuration, in the non-excited state, the torque spring 34b presses the armature 32 against the brake rotor 36 to generate a braking force. On the other hand, in the excited state, the coil 34a attracts the armature 32 toward the excitation unit 34 with an attractive force stronger than the biasing force of the torque spring 34b, thereby releasing the braking state.

[0031] In the braking means 22 having such a basic configuration, linings (friction materials) may be placed on the opposing surfaces of the brake rotor 36, base braking plate 28, and armature 32 to increase the braking force.

[0032] The brake release means 40 is an element for releasing the braked state from outside the in-wheel motor 10 when the power supply to the above-mentioned braking means 22 is cut off. The brake release means 40 according to this embodiment has an actuating lever 40a, a rotating shaft 40b, and a release lever 40c. The actuating lever 40a is an element for applying a rotational force to the brake release plate 30. The actuating lever 40a according to this embodiment is a plate piece configured so that a free end of a torsion spring 38 arranged on the base plate 26 is engaged at a part of its tip end, and the tip end engages with the input protrusion 30c of the brake release plate 30. The rotating shaft 40b is arranged on the base end side of the actuating lever 40a, and is an element that serves to rotate the brake release plate 30 by rotating the actuating lever 40a. In this embodiment, the tip end side of the rotating shaft 40b engages with the base end of the actuating lever 40a, and the base end side is exposed to the outside of the in-wheel motor 10 via the stator 14. The release lever 40c is disposed on the base end side of the rotary shaft 40b and is an element for applying a rotational force to the rotary shaft 40b. With the brake release means 40 configured as described above, it is possible to rotate the brake release plate 30 of the braking means 22 by operating the release lever 40c disposed outside the in-wheel motor 10.

[0033] The rotor 42 is an element for generating a rotational force in a sun gear 48 disposed around the main shaft 12. The rotor 42 according to this embodiment has a yoke 42a and a cover 42b. The yoke 42a is a U-shaped portion disposed opposite and adjacent to the inner and outer circumferential surfaces of the coil 18, which is erected on the flange 16b of the stator 14, and is provided with a permanent magnet on at least one of the surfaces facing the coil 18. With this configuration, power is generated by the influence of a magnetic field generated by power supplied to the coil 18.

[0034] The cover 42b is an element that supports the cylindrically formed yoke 42a and allows it to rotate around the main shaft 12. The cover 42b according to this embodiment is fixed to a cylindrical member 46 that is disposed on the main shaft 12 via a bearing 44, and is configured to support the yoke 42a. With this configuration, it becomes possible to rotate the yoke 42 around the non-rotating main shaft 12 as a base point.

[0035] Here, a sun gear 48 constituting a transmission means is disposed at the lower end of a cylindrical member 46 to which a cover 42b of the rotor 42 is fixed. With this configuration, the sun gear 48 also rotates as the rotor 42 rotates, and the rotational force of the rotor 42 can be transmitted to the planetary gear 20.

[0036] The wheel 50 is an outer shell that encloses the stator 14 and rotor 42, and is provided with a tire 58 on its outer periphery, serving as a driving means. The wheel 50 according to this embodiment can be separated into an inner wheel 52 and an outer wheel 54. The inner wheel 52 is supported by a boss 16a of the base 16 that constitutes the stator 14 via a bearing 56, and a planetary carrier (internal gear) 52a that constitutes a transmission means is provided on a portion of its inner surface. The planetary carrier 52a is a gear that meshes with a gear 20b with fewer teeth that constitutes the planetary gear 20 arranged on the stator 14, and serves to transmit the rotational force of the rotor 42 to the wheel 50. The outer wheel 54 is composed of a rim 54a that can engage with the outer periphery of the inner wheel 52 and an outer 54b. By engaging with the inner wheel 52, the outer wheel 54 forms a case that covers the stator 14 and the rotor 42.

[0037] In the embodiment shown in Fig. 1, the tire 58 is disposed directly on the outer periphery of the wheel 50. However, as shown in Fig. 10, a tire 58 with a larger diameter may be used by arranging spokes 58a on the outer periphery of the wheel 50 and then arranging the tire 58 on that outer periphery. In this case, it is preferable to provide a rim 58b that matches the diameter of the tire as needed.

[0038] [Effect] The in-wheel motor 10 configured as described above operates as follows: First, when power is supplied to the excitation unit 34 of the braking means 22, the armature 32 is attracted to the excitation unit 34, and the brake rotor 36 is released (braking is released), as shown in Figure 7, allowing the rotor 42 of the in-wheel motor 10 to rotate.

[0039] Next, when power is supplied to the coil 18 of the stator 14, the rotor 42 rotates, which in turn rotates the wheel 50 via the transmission means, thereby functioning as the in-wheel motor 10.

[0040] On the other hand, if the power supplied to the in-wheel motor 10 is cut off due to, for example, a dead battery, not only will power to the rotor 42 be cut off, but in the non-excitation operated braking means 22, the attraction of the armature 32 by the excitation part 34 will be released. As a result, as shown in Figure 8, the armature 32 is pressed against the brake rotor 36 by the biasing force of the torque spring 34b, and the brake rotor 36 is sandwiched between the base braking plate 28 and the armature 32, restricting its rotation. As a result, the rotation of the wheel 50 via the transmission means is also restricted, and the in-wheel motor 10 as a whole enters a braking state.

[0041] In such a state, by operating the release lever 40c of the brake release means 40 and rotating the rotary shaft 40b, the operating lever 40a rotates in the direction of arrow A (see FIGS. 2 and 3), thereby rotating the brake release plate 30 of the brake means 22. When the brake release plate 30 rotates in the direction of arrow C (see FIG. 5), the roller 28a disposed in the through hole 30a is pushed by the side wall and protrudes from the recess 28b formed in the base brake plate 28. As a result, as shown in FIG. 9, the roller 28a protruding from the recess 28b pushes the armature 32 back toward the excitation portion 34. As a result, the clamping of the brake rotor 36 between the armature 32 and the base brake plate 28 is released, allowing the brake rotor 36 to rotate. Therefore, the braking of the in-wheel motor 10 is released, allowing the wheel 50 to rotate in a non-excited state, and if the in-wheel motor 10 is attached to a vehicle, allowing the vehicle to move.

[0042] Furthermore, because the free end of the torsion spring 38 disposed on the base plate 26 is engaged with the operating lever 40a, rotating the operating lever 40a generates a reaction force in the torsion spring 38. Therefore, when the input of force in the rotation direction (the direction of arrow A in FIG. 3) to the release lever 40c is released, the operating lever 40a is pushed back in the direction indicated by arrow B due to the reaction force of the torsion spring 38, returning to the position before rotation. As a result, the brake release plate 30 also returns to its initial position, and the roller 28a disposed in the through hole 30a is inserted into the recess 28b.

[0043] [effect] With the in-wheel motor 10 configured as described above, it is possible to arrange the motor (stator 14 and rotor 42) as power source, as well as the transmission means (sun gear 48, planetary gears 20, planetary carrier 52a) and braking means 22 inside the wheel 50 as a casing, while still being able to reduce the thickness of the wheel 50 itself (thickness along the axial direction of the main shaft 12). Furthermore, the braking means 22 employed in the in-wheel motor 10 configured as described above uses a sliding (rotating) method for releasing braking in a non-excited state, and is configured to push back the armature 32 at multiple points or surfaces, so that the posture of the armature 32 is good when braking is released (the armature 32 is less likely to tilt).

[0044] Furthermore, the brake release means 40 is configured to return to its initial position by the force of the torsion spring 38, so that the force input required for manual brake release and for returning to the braked state can be limited to one direction (one system).

[0045] [Application form] At least two in-wheel motors 10 configured as described above are applied to vehicles such as wheelchairs and carts. For example, when the in-wheel motor 10 according to the above embodiment is applied to a wheelchair, the configuration is as shown in Fig. 10. Fig. 11 is a diagram showing the wheel as viewed from the direction of arrow D shown in Fig. 10.

[0046] The wheelchair 60 shown in Figure 10 has a main shaft 12 fixed to the body of the wheelchair 60, and has spokes 58a and a rim 58b arranged on the outer periphery of the wheel 50, with a tire 58 attached to form a wheel 68. The wheelchair 60 shown in Figure 10 also has an operating means 64 for operating the in-wheel motor 10 near an arm support 62 located at the user's (passenger's) hand. It is also advisable to provide an operating means (details not shown) for the in-wheel motor 10 near a handle 66 operated by an assistant on the wheelchair 60. This is to improve operability when the assistant operates the wheelchair 60.

[0047] The operation of the release lever 40c of the brake release means 40 in the in-wheel motor 10 described above can be configured to be electrically and / or mechanically remotely controlled, and the operation unit can be located near the operation means 64 or near the handle 66. This configuration allows both the caregiver and the user to manually release the brake means 22 at their fingertips. [Explanation of symbols]

[0048] 10....In-wheel motor, 12....Main shaft, 14....Stator, 16....Base, 16a....Boss, 16b....Flange, 18....Coil, 20....Planetary gear, 20a....Gear, 20b....Gear, 20c....Gear case, 20c1....Boss, 22....Braking means, 24....Electromagnetic brake, 26....Base plate, 26a....Through hole, 26b....Through hole, 26c....Spacer, 28....Base braking plate, 28a....Roller, 28b....Recess, 28c....Support, 30....Brake release plate, 30a....Through hole, 30b....Notch, 30c....Input protrusion, 30c1....Notch, 32....Armature, 32a....Through hole, 34....Excitation Magnetic part, 34a... Coil, 34b... Torque spring, 36... Brake rotor, 38... Torsion spring, 40... Brake release means, 40a... Operating lever, 40b... Rotating shaft, 40c... Release lever, 42... Rotor, 42a... Yoke, 42b... Cover, 44... Bearing, 46... Cylindrical member, 48... Sun gear, 50... Wheel, 52... Inner wheel, 52a... Planetary carrier, 54... Outer wheel, 54a... Rim, 54b... Outer, 56... Bearing, 58... Tire, 58a... Spokes, 58b... Rim, 60... Wheelchair, 62... Arm support, 64... Operating means, 66... ​​Handle.

Claims

1. An in-wheel motor comprising: a stator fixed to a main shaft and equipped with a cylindrical coil; a rotor having a permanent magnet arranged to face the cylindrical coil and rotatable about the main shaft; a wheel constituting an outer shell; and a speed change means for transmitting a rotational force of the rotor to the wheel, an in-wheel motor, characterized in that a braking means is disposed together with the speed change means on the inner circumferential side of the cylindrical coil between the stator and the rotor disposed opposite to each other;

2. the braking means is a non-excitation type electromagnetic brake, a base brake plate disposed opposite the armature via the brake rotor; and a brake release plate disposed between the base brake plate and the armature, 2. The in-wheel motor according to claim 1, wherein a cam mechanism is provided between the base brake plate and the armature, and when the electromagnetic brake is in a braking state, the brake release plate is moved in a direction along a plate surface to activate the cam mechanism and push back the armature.

3. 3. The in-wheel motor according to claim 2, further comprising biasing means for generating a reaction force when a force for moving the brake release plate in a direction along the plate surface is applied to the brake release plate, and for returning the brake release plate to its initial state after the force is released.

4. 4. The in-wheel motor according to claim 3, wherein the cam mechanism is composed of an inclined surface and a roller.

5. 5. The in-wheel motor according to claim 4, wherein the movement of the brake release plate is a rotational movement around the center of rotation of the rotor.

6. a brake release means for applying a force for the rotation to the brake release plate; 6. The in-wheel motor according to claim 5, wherein the brake release means comprises: an operating lever that engages with the brake release plate; a rotating shaft that has one end engaged with the operating lever and the other end exposed to the outside of the wheel via the stator; and a release lever that engages with the other end of the rotating shaft.

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