Motors, hub motors, and electric vehicles

Abstract

To provide a motor that can be miniaturized and lightened while suppressing the intrusion of foreign matter. [Solution] The motor includes a first member having a first mating portion and rotating around a rotation axis extending in the axial direction, a second member having a second mating portion connected to the first mating portion of the first member and rotating together with the first member around a central axis, a plurality of fastening members fastening the first member and the second member in the axial direction, and a sealing member disposed between the first member and the second member. At least one of the first sealing surface of the first mating portion and the second sealing surface of the second mating portion has a recess that is recessed on the opposite side from the other. The sealing member is disposed in a space enclosed by the first sealing surface, the second sealing surface, and the second side surface of the motor.

Description

Technical Field

[0001] The present invention relates to a motor, a hub motor using the motor, and an electric vehicle using the hub motor.

Background Art

[0002] Conventional motors use a motor case composed of a bottomed cylindrical case body and a cover provided to close the opening of the case body. An O-ring for ensuring the sealing property between the case body and the cover is provided at the periphery of the opening of the case body. Thereby, entry of foreign matter from between the case body and the cover is suppressed (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, it has been necessary to secure a portion for screwing members together and a portion for arranging a sealing member such as an O-ring, making it difficult to miniaturize the motor.

[0005] An object of the present invention is to provide a motor that can be miniaturized and lightened while suppressing entry of foreign matter.

Means for Solving the Problems

[0006] An exemplary motor of the present invention includes a first member having a first mating portion and rotating about a rotation axis extending in the axial direction, a second member having a second mating portion connected to the first mating portion of the first member and rotating together with the first member about a central axis, a plurality of fastening members fastening the first member and the second member in the axial direction, and a seal member disposed between the first member and the second member. The first mating portion has a cylindrical first side surface provided at one end in the radial direction, an annular first seal surface provided at one end in the radial direction on the first end face on the one end in the axial direction and in contact with the seal member, an annular first contact surface provided at the other end in the radial direction of the first seal surface on the first end face, and a plurality of first fastening portions provided between the first contact surface and the first seal surface in the radial direction, arranged in the circumferential direction and housing the fastening members. The second mating portion includes an annular second contact surface provided on the second end face on the other side in the axial direction and in contact with the first contact surface in the axial direction, an annular second seal surface provided on the second end face and facing the first seal surface in the axial direction and in contact with the seal member, a plurality of second fastening portions provided between the second contact surface and the second seal surface in the radial direction and arranged in the circumferential direction, which accommodate the fastening member, and a projection portion that extends in the axial direction and has a second side surface that contacts the first side surface. At least one of the first seal surface and the second seal surface has a recess that is recessed on the opposite side from the other. The seal member is arranged in the space enclosed by the first seal surface, the second seal surface and the second side surface. [Effects of the Invention]

[0007] According to the exemplary motor of the present invention, miniaturization and weight reduction are possible while suppressing the ingress of foreign matter. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram of an electric vehicle according to an embodiment of the present invention. [Figure 2] Figure 2 is a perspective view of the hub motor. [Figure 3] Figure 3 is a cross-sectional view of the hub motor cut along a vertical plane containing the central axis J1. [Figure 4] Figure 4 is a cross-sectional perspective view showing the hub cover in a cut state. [Figure 5] Figure 5 is an enlarged cross-sectional view of the portion of the first connection part that includes the internal thread seat. [Figure 6] Figure 6 is an enlarged cross-sectional view of the portion between the internal screw seats of the first connection. [Figure 7] Figure 7 is an enlarged cross-sectional view of the portion of the second connection part that includes the screw seat. [Figure 8] Figure 8 is an enlarged cross-sectional view of the portion between the screw seats of the second connection. [Modes for carrying out the invention]

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, when describing the hub motor 100, the direction parallel to the central axis J1 of the hub motor 100 will be referred to as the "axial direction". The direction perpendicular to the central axis J1 will be referred to as the "radial direction", and the direction along the arc centered on the central axis J1 will be referred to as the "circumferential direction". Using the hub motor 100 shown in Figure 3 as a reference, the right side will be defined as "one side S1 in the axial direction", and the left side as "the other side S2 in the axial direction".

[0010] Note that the directions described below are defined for the sake of clarity and may not correspond to the actual directions in which the hub motor 100 is used.

[0011] <Electric Vehicle 200> Figure 1 is a schematic diagram of an electric vehicle according to an embodiment of the present invention. In this embodiment, the electric vehicle 200 is an electric assist bicycle that assists the force applied by the user when pedaling 206. As shown in Figure 1, the electric vehicle 200 includes a body 201, two wheels 202, a power transmission mechanism 203, and a power supply unit 204.

[0012] The vehicle body 201 includes a handlebar 207 and a saddle 208. Two wheels 202, a power transmission mechanism 203, and a power supply unit 204 are mounted on the vehicle body 201. The two wheels 202 are mounted on the front of the vehicle body 201 as front wheels 202f and on the rear as rear wheels 202r. The rear wheels 202r are connected to the power transmission mechanism 203. A hub motor 100 is positioned in the center of the rear wheels 202r.

[0013] The power transmission mechanism 203 comprises a crank 205 and a pedal 206. The power transmission mechanism 203 further includes a chain 203c connecting a drive gear 203a and a driven gear 203b attached to the hub motor 100 of the rear wheel 202r. By operating the pedal 206 (pressing the pedal 206), torque is applied to the shaft to which the crank 205 is connected. The torque applied to the shaft to which the crank 205 is connected is transmitted to the hub motor 100 via the drive gear 203a, the driven gear 203b, and the chain 203c.

[0014] The power supply unit 204 is attached to the vehicle body 201. The power supply unit 204 is, for example, a battery. However, it is not limited to this, and a wide range of configurations can be adopted in which it is attached to the vehicle body 201 and can supply power to the hub motor 100.

[0015] In the electric vehicle 200, torque is generated in the crank 205 when the user, seated on the saddle 208, steps on the pedal 206. The torque generated in the crank 205 is transmitted to the hub motor 100 via the chain 203c. The hub motor 100 is equipped with a torque sensor 42, which will be described later, for detecting the transmitted torque. The hub motor 100 determines the assist torque based on the torque detected by the torque sensor 42. The hub motor 100 transmits a driving torque to the rear wheel 202r, which is the torque transmitted by the chain 203c plus the assist torque. The rear wheel 202r is rotated by the transmitted driving torque.

[0016] <Hub motor 100> FIG. 2 is a perspective view of the hub motor 100. FIG. 3 is a cross-sectional view of the hub motor 100 cut along a vertical plane including the central axis J1.

[0017] The hub motor 100 is disposed at the center of the rear wheel 202r and is connected to an annular rim included in the rear wheel 202r via spokes (not shown).

[0018] Note that the wheel on which the hub motor 100 is disposed is not limited to the rear wheel 202r, and it may be disposed on the front wheel 202f or on both the front wheel 202f and the rear wheel 202r. When disposed on the front wheel 202f, a detector such as a sensor for detecting torque based on the force applied by the user stepping on the pedal is provided in any of the elements constituting the power transmission mechanism 203.

[0019] The hub motor 100 includes a hub body 10, a hub cover 20, a motor 30, a driven gear attachment portion 40, a speed reduction mechanism 50, and seal members 61 and 62 (see FIGS. 5 to 8). When power is supplied to the hub motor 100, the motor 30 housed therein is driven. The torque converted by the speed reduction mechanism 50 from the power generated by the motor 30 is the assist torque.

[0020] <Hub body 10> The hub body 10 has a bottomed cylindrical shape with an open end on one side S1 in the axial direction. The hub body 10 includes a hub cylinder portion 11, a hub bottom portion 12, a first hub shaft 13, and a first hub bearing 14. The hub cylinder portion 11 has a cylindrical shape extending in the axial direction. In the hub motor 100 according to the present embodiment, the hub cylinder portion 11 of the hub body 10 is cylindrical, but it is not limited thereto. A hub cover 20 is fixed to an end of the hub cylinder portion 11 on one side S1 in the axial direction. That is, the hub motor 100 includes the hub body 10 and a hub cover 20 that covers one end of the hub body 10 in the axial direction. The hub cylinder portion 11 and the hub cover 20 are axially fastened by a fastening member Bt. For example, the fastening member Bt is a screw. Note that the fastening member Bt is not limited to a screw, and a fixing tool such as a rivet can be widely adopted.

[0021] The hub bottom 12 is annular in shape, extending radially inward DI from the other axial end S2 of the hub cylinder 11. The central part of the hub bottom 12 has a shaft hole 121 that penetrates axially. The first hub shaft 13 extends axially. The first hub shaft 13 is fixed to the vehicle body 201 of the electric vehicle 200, for example, when the hub motor 100 is used in the electric vehicle 200. In other words, the first hub shaft 13 is a fixed shaft.

[0022] The first hub shaft 13 passes through the shaft hole 121. The hub body 10 is rotatably supported on the first hub shaft 13 via the first hub bearing 14. The first hub bearing 14 is a ball bearing in this case, but is not limited to this; a wide range of bearings can be used to rotatably support the hub body 10 on the first hub shaft 13.

[0023] One end S1 in the axial direction of the first hub shaft 13 is connected to a planetary carrier 54 of the reduction mechanism 50, which will be described later. In this embodiment of the hub motor 100, the first hub shaft 13 is integrated with the planetary carrier 54. As will be described in detail later, the planetary carrier 54 is fixed to the first motor cover 361 of the motor 30, which will be described later.

[0024] <Hub cover 20> Figure 4 is a cross-sectional perspective view showing the hub cover 20 in a cut state. The hub cover 20 is connected to one end S1 in the axial direction of the hub cylinder portion 11 of the hub body 10, and covers the opening at one end S1 in the axial direction of the opening of the hub cylinder portion 11. As a result, an internal space 101 is formed in the hub body 10. A motor 30, a reduction mechanism 50, etc. are housed inside the internal space 101. The hub cover 20 is annular when viewed from the axial direction and has a cover body portion 21, a first connecting portion 22, and a second connecting portion 23.

[0025] <Cover body part 21> The cover body 21 is annular when viewed from the axial direction, and a through hole 211 is provided in the center when viewed from the axial direction, passing through in the axial direction. The second hub shaft 24 passes through the through hole 211 and is fixed to the second motor cover 362 of the motor 30, which will be described later. The second hub shaft 24 is a fixed shaft, similar to the first hub shaft 13. For example, in the electric vehicle 200, the second hub shaft 24 is fixed to the vehicle body 201. The torque sensor 42 of the driven gear mounting portion 40, which will be described later, is fixed to the first connection portion 22 of the cover body 21 through the through hole 211.

[0026] <First connection section 22> The first connection portion 22 is provided at the end of the radially inward DI of the cover body portion 21. The first connection portion 22 is provided with six internal screw seats 26. The six internal screw seats 26 are arranged at equal intervals in the circumferential direction. The sensor flange portion 421 of the torque sensor 42, which will be described later, is positioned to overlap the first connection portion 22 in the axial direction. The fastening member Bt passes through the internal fastening portion 225 provided on the internal screw seat 26, and the tip of the fastening member Bt is screwed into the sensor fastening portion 425 provided on the sensor flange portion 421, thereby fixing the first connection portion 22 and the sensor flange portion 421, that is, the hub body 10 and hub cover 20 and the driven gear mounting portion 40.

[0027] <Second connection section 23> The second connecting portion 23 is provided at the radially outward DO end of the cover body portion 21. The second connecting portion 23 is provided with six external screw seats 27. The six external screw seats 27 are arranged at equal intervals in the circumferential direction. The second connecting portion 23 is positioned in contact with the cylindrical end face 112, which is the axial end S1 of the hub cylindrical portion 11 of the hub body 10. The fastening member Bt passes through the external fastening portion 235 provided on the external screw seat 27, and the tip of the fastening member Bt is screwed into the cylindrical fastening portion 115 provided on the cylindrical end face 112, thereby fixing the second connecting portion 23 to the hub cylindrical portion 11, that is, the hub body 10 and the hub cover 20.

[0028] With this configuration, the hub body 10 and the hub cover 20 are rotatably supported by the first hub shaft 13 and the second hub shaft 24 via the first hub bearing 14 and the second hub bearing 25. The centerlines of both the first hub shaft 13 and the second hub shaft 24 coincide with the central axis J1. Therefore, the hub body 10 and the hub cover 20 are rotatable about the central axis J1. Details of the connection configuration in the first connection part 22 and the second connection part 23 will be described later.

[0029] <Motor 30> Motor 30 is a DC brushless motor. Motor 30 is driven by power from the power supply unit 204. Motor 30 includes a motor shaft 31, a rotor 32, a sleeve 33, a one-way clutch 34, a stator 35, a first motor cover 361, a second motor cover 362, a first shaft bearing 371, and a second shaft bearing 372.

[0030] <Motor shaft 31> The motor shaft 31 is substantially cylindrical in shape, with its centerline coinciding with the central axis J1. The motor shaft 31 is rotatably supported inside a substantially cylindrical sleeve 33 via a first shaft bearing 371, which is spaced apart in the axial direction. The motor shaft 31 is also rotatably supported by the first motor cover 361 and the second motor cover 362, respectively, via a second shaft bearing 372. In other words, the motor shaft 31 is rotatable around the central axis J1 relative to the sleeve 33, and also rotatable around the central axis J1 relative to the first motor cover 361 and the second motor cover 362. The first shaft bearing 371 and the second shaft bearing 372 are ball bearings, but are not limited to them. A wide range of bearing structures that can smoothly and accurately support the motor shaft 31 can be employed.

[0031] <Rotor 32> The rotor 32 includes a rotor core 321 and magnets 322. The rotor core 321 is formed by stacking thin sheets of electromagnetic steel in the axial direction. The rotor core 321 is cylindrical in shape and extends along the axial direction. The rotor core 321 may also be formed by sintering magnetic powder. Multiple magnets 322 are arranged and fixed in the circumferential direction on the outer surface of the rotor core 321. The magnetic poles of the radially outer surfaces of the multiple magnets 322 are alternately different in the circumferential direction.

[0032] <Stata 35> The stator 35 is held by the first motor cover 361 and the second motor cover 362. In other words, the stator 35 is fixed to the first hub shaft 13 and the second hub shaft 24. The stator 35 has a stator core 351, an insulator 352, and a coil 353. The stator core 351 is formed by laminating thin sheets of electromagnetic steel in the axial direction. Alternatively, the stator core 351 may be formed by sintering magnetic powder.

[0033] The stator core 351 has a plurality of teeth that protrude radially, and the plurality of teeth are arranged at equal intervals in the circumferential direction. The insulator 352 is insulating and covers at least the teeth. The coil 353 is formed by winding a wire around the teeth covered by the insulator 352.

[0034] When current is supplied to the coil 353, the coil 353 is energized. Due to the attractive or repulsive force between the magnetic force of the coil 353 and the magnetic force of the magnet 322 of the rotor 32, the rotor 32 rotates circumferentially around the central axis J1. As the rotor 32 rotates, the sleeve 33 also rotates together with the rotor 32 around the central axis J1. In other words, the torque generated in the rotor 32 by the magnetic force between the coil 353 and the magnet 322 is also transmitted to the sleeve 33.

[0035] <One-way clutch 34> The sleeve 33 and the motor shaft 31 are rotatably connected via a first shaft bearing 371 and also via a one-way clutch 34. The one-way clutch 34 transmits torque only in a predetermined direction. In other words, the one-way clutch 34 transmits torque from the rotor 32 to the motor shaft 31 when the rotor 32 rotates in a predetermined direction.

[0036] <First motor cover 361 and second motor cover 362> The first motor cover 361 is fixed to the other axial side S2 of the stator 35. The second motor cover 362 is fixed to the one axial side S1 of the stator 35. The first motor cover 361 and the second motor cover 362 are fixed together by a screw (not shown) that passes through in the axial direction. At this time, the screw passes through the stator core 351. In this way, the stator core 351 is fixed to the first motor cover 361 and the second motor cover 362.

[0037] As described above, the first motor cover 361 is fixed to the first hub shaft 13, and the second motor cover 362 is fixed to the second hub shaft 24. In other words, the motor 30 is fixed to the first hub shaft 13 and the second hub shaft 24.

[0038] <Other components of motor 30> The motor 30 includes a circuit board 38 and a busbar 39. Lead wires Cb are connected to the circuit board 38. Power is supplied via lead wires Cb from an external power source, such as a power supply unit 204. Electronic components are mounted on the circuit board 38, and a current is generated that is supplied to the coil 353. The circuit board 38 is connected to the busbar 39, and the current generated on the circuit board 38 is supplied to the coil 353 via the busbar 39.

[0039] The motor 30 is driven by power supplied from the power supply unit 204. In other words, the current generated by the circuit board 38 is supplied to the coil 353, which is then energized. By energizing multiple coils 353 at the appropriate timing, a circumferential torque is generated in the rotor 32 around the central axis J1. This torque causes the motor shaft 31 to rotate around the central axis J1.

[0040] <Driven gear mounting section 40> The driven gear mounting portion 40 protrudes from the hub cover 20 to one side S1 in the axial direction. The driven gear mounting portion 40 has a mounting cylinder portion 41 and a torque sensor 42. The driven gear 203b is fixed to the mounting cylinder portion 41. If the driven gear 203b is configured to be variable speed, a configuration in which multiple gears of different fractional numbers are mounted in a line in the axial direction may be used. The mounting cylinder portion 41 is connected to the torque sensor 42 via a one-way clutch (not shown). In other words, the mounting cylinder portion 41 transmits torque to the torque sensor 42 when it rotates in a predetermined direction and rotates relative to the torque sensor 42 when it rotates in the opposite direction.

[0041] The mounting cylinder portion 41 and torque sensor 42 of the driven gear mounting portion 40 are rotatably supported on the second hub shaft 24 via the second hub bearing 25. In other words, the driven gear mounting portion 40 has a torque sensor 42 that is attached to the second hub shaft 24 and has a rotatable portion.

[0042] The torque sensor 42 has a sensor flange portion 421. The sensor flange portion 421 extends radially outward DO from the other end S2 in the axial direction. The sensor flange portion 421 is provided with a sensor fastening portion 425 that penetrates in the axial direction. In the hub motor 100 of this embodiment, a female thread is formed on the inner circumferential surface of the sensor fastening portion 425 into which a fastening member Bt can be screwed.

[0043] As a result, when the direction of torque transmitted to the driven gear 203b attached to the mounting cylinder 41 is in the direction that moves the electric vehicle 200, the torque transmitted to the driven gear 203b is transmitted to the hub cover 20. At this time, the torque sensor 42 measures the torque transmitted from the driven gear 203b to the hub cover 20. Also, if the rotation direction of the driven gear 203b is reversed, no torque is transmitted from the mounting cylinder 41 to the torque sensor 42.

[0044] For example, in the electric vehicle 200, when the operation of the pedal 206 is stopped, the driven gear 203b, that is, the rotation of the mounting cylinder 41 to which the driven gear 203b is attached, stops. As a result of the stopping of the rotation of the mounting cylinder 41, the torque sensor 42 rotates freely relative to the mounting cylinder 41. Consequently, even when the operation of the pedal 206 is stopped, the rear wheel 202r rotates freely, and the electric vehicle 200 can continue to move by inertia.

[0045] In the hub motor 100 of this embodiment, the six sensor fastening portions 425 are arranged at equal intervals in the circumferential direction, but this is not limited to this arrangement, and they do not have to be at equal intervals.

[0046] <Deceleration mechanism 50> As shown in Figure 3, the reduction gear 50 includes a sun gear section 51, a planetary gear section 52, and an internal gear section 53. The reduction gear 50 uses a so-called planetary gear mechanism to reduce the rotation of the motor shaft 31 and transmit it to the hub body 10.

[0047] <Sun Gear Unit 51> The sun gear section 51 is positioned at the other end S2 in the axial direction of the motor shaft 31. The sun gear section 51 rotates integrally with the motor shaft 31. Therefore, the sun gear section 51 may be formed from a single component with respect to the motor shaft 31, or it may be attached to the motor shaft 31 and fixed by fixing methods such as adhesive, welding, screwing, crimping, or press-fitting. Other fixing methods may also be employed. In addition, a wide range of fixing methods can be used to fix the sun gear section 51 so that it can rotate integrally with the motor shaft 31.

[0048] <Planetary gear section 52> The reduction mechanism 50 has multiple planetary gear sections 52. In this embodiment, the reduction mechanism 50 has three planetary gear sections 52, but it is not limited to three. It is sufficient to have two or more planetary gear sections 52. The three planetary gear sections 52 are arranged in the circumferential direction. The multiple planetary gear sections 52 are arranged at equal intervals in the circumferential direction. The planetary gear sections 52 mesh with the sun gear section 51.

[0049] The planetary gear section 52 will be described further. The planetary gear section 52 includes a first planetary gear 521 and a second planetary gear 522. The first planetary gear 521 and the second planetary gear 522 are rotatably supported on a planetary shaft 541 fixed to the first motor cover 361 and the planetary carrier 54. The planetary shaft 541 extends along a planetary axis J2 parallel to the central axis J1. The planetary carrier 54 is connected to one end S1 in the axial direction of the first hub shaft 13. In other words, the position of the planetary axis J2 of the planetary gear section 52 relative to the central axis J1 is fixed.

[0050] The first planetary gear 521 and the second planetary gear 522 are rotatably supported on the planetary shaft 541. The first planetary gear 521 and the second planetary gear 522 are connected in the axial direction. The second planetary gear 522 rotates integrally with the first planetary gear 521. In other words, the planetary gear section 52 is a two-stage gear. However, the planetary gear section 52 is not limited to a two-stage gear. The planetary gear section 52 may be a multi-stage gear with three or more stages, or it may be a configuration having only a single diameter, that is, a gear with a predetermined number of teeth. The first planetary gear 521 and the second planetary gear 522 may be formed from a single member, or they may be combined in the axial direction and fixed using fixing methods such as bonding, welding, or screwing. In the planetary gear section 52, the first planetary gear 521 meshes with the sun gear section 51, and the second planetary gear 522 meshes with the internal gear section 53.

[0051] <Internal gear section 53> The internal gear section 53 is an annular gear. Internal teeth are formed on its radially inner surface. The internal gear section 53 meshes with the second planetary gear 522 of the planetary gear section 52. The internal gear section 53 is fixed to the hub body 10. In other words, the torque generated in the motor shaft 31 is transmitted to the internal gear section 53 via the sun gear section 51 and the planetary gear section 52. The hub body 10 is rotated by the torque transmitted to the internal gear section 53.

[0052] In this embodiment, the hub motor 100 employs a planetary gear mechanism as the reduction mechanism 50, but is not limited to this. A wide range of configurations capable of reducing the rotation output from the motor 30 can be used. Alternatively, the motor shaft 31 of the motor 30 may be directly connected to the hub body 10.

[0053] <Connection between the first connection part 22 and the torque sensor 42> Details of the connection between the first connection part 22 and the torque sensor 42 will be described with reference to the drawings. Figure 5 is an enlarged cross-sectional view of the portion of the first connection part 22 including the internal screw seat 26. Figure 6 is an enlarged cross-sectional view of the portion of the first connection part 22 between the internal screw seats 26. In the connection between the first connection part 22 and the torque sensor 42, the radially outward DO is on one radial side, and the radially inward DI is on the other radial side.

[0054] The first connecting portion 22 has an inner flange portion 221 and an inner protrusion portion 227. The inner flange portion 221 is provided at the radial inner end of the cover body portion 21 and is annular in shape, extending radially inward DI.

[0055] In the hub motor 100 according to this embodiment, a first member 71 having a first mating portion 711 and rotating around a central axis J1 extending in the axial direction is connected to a second member 72 having a second mating portion 721 connected to the first mating portion 711 of the first member 71 and rotating together with the first member 71 around the central axis J1. A fastening member Bt fastens the first member 71 and the second member 72 in the axial direction. Multiple fastening members Bt are provided. A sealing member 61 is positioned between the first member 71 and the second member 72. The second mating portion 721 has a projection 727 that extends in the axial direction and has a second side surface 720.

[0056] In the connection between the first connection part 22 and the torque sensor 42, the torque sensor 42 is the first member 71, and the sensor flange portion 421 of the torque sensor 42 is the first mating portion 711. Also, the hub cover 20 is the second member 72, and the inner flange portion 221, which is the end of the radially inward DI of the hub cover 20, is the second mating portion 721.

[0057] A cylindrical sensor outer surface 426 is provided on the radial outer edge of the sensor flange portion 421 of the torque sensor 42. The sensor outer surface 426 is the first side surface 710 and is cylindrical, located at one end in the radial direction. The sensor flange end surface 422 on one axial side S1 of the sensor flange portion 421 is provided with a sensor flange sealing surface 423 and a sensor flange contact surface 424. The sensor flange sealing surface 423 is annular and located radially outward DO. The sensor flange contact surface 424 is annular and located radially inward DI of the sensor flange sealing surface 423. The sensor flange portion 421 is provided with six sensor fastening portions 425 that penetrate in the axial direction.

[0058] Specifically, sensor fastening portions 425, which are first fastening portions 715, are arranged circumferentially on the sensor flange portion 421, and a sensor flange contact surface 424, which is a first contact surface 714, and a sensor flange sealing surface 423, which is a first sealing surface 713, are provided radially outward DO from the first fastening portions 715 of the sensor flange portion 421.

[0059] To explain further, the first mating portion 711 has a cylindrical first side surface 710 provided at one end in the radial direction, an annular first sealing surface 713 provided at one end in the radial direction on the first end surface 712 on one side S1 in the axial direction and in contact with the sealing member 74, an annular first contact surface 714 provided on the first end surface 712 on the other radial side of the first sealing surface 713, and a plurality of first fastening portions 715 provided radially between the first contact surface 714 and the first sealing surface 713, arranged in the circumferential direction and accommodating the fastening member Bt.

[0060] The inner flange portion 221 has an inner flange end face 222 and six inner fastening portions 225. The inner flange end face 222 is the end face of the other axial side S2 of the inner flange portion 221. The inner flange end face 222 is provided with an annular inner flange sealing surface 223 provided radially outward DO and an annular inner flange contact surface 224 provided radially inward DI from the inner flange sealing surface 223. A recess 226 that is recessed in the axial direction is formed in the inner flange sealing surface 223. In the hub motor 100 of this embodiment, the recess 226 is formed over the entire surface of the inner flange sealing surface 223. The recess is formed on the inner flange sealing surface 223, but is not limited to this, and may also be formed on the sensor flange sealing surface 423. Furthermore, the recess may be formed on both the inner flange sealing surface 223 and the sensor flange sealing surface 423.

[0061] Specifically, an inner fastening portion 225, which is a second fastening portion 725, is arranged in the circumferential direction in the portion that overlaps axially with the inner flange portion 221 at the end of the radially inward DI of the hub cover 20. Then, an inner flange contact surface 224, which is a second contact surface, is provided radially outward DO from the inner fastening portion 225, which is a second fastening portion 725, in the portion that overlaps axially with the inner flange portion 221 of the hub cover 20, and an inner flange seal surface 223, which is a second seal surface, is provided radially inward DI.

[0062] To further explain, the second mating portion 721 has an annular second contact surface 724 provided on the second end face 722 of the other axial side S2 and in axial contact with the first contact surface 714, an annular second seal surface 723 provided on the second end face 722 and facing the first seal surface 713 in the axial direction and in contact with the seal member 74, and a plurality of second fastening portions 725 provided radially between the second contact surface 724 and the second seal surface 723 and arranged in the circumferential direction, which accommodate the fastening member Bt. At least one of the first seal surface 713 and the second seal surface 723 has a recess 728 that is recessed on the opposite side from the other.

[0063] The inner flange portion 221 is provided with six internal screw seats 26. Each internal screw seat 26 is provided with a pressing surface 261, which is the end face of one side S1 in the axial direction. Each internal screw seat 26 is provided with an internal fastening portion 225 that penetrates from the center of the pressing surface 261 to the inner flange end face 222. The internal fastening portion 225 is a through hole through which the fastening member Bt passes, and here, the inner circumferential surface is cylindrical. In the hub motor 100 of this embodiment, the six internal screw seats 26 and internal fastening portions 225 are arranged at equal intervals in the circumferential direction, but this is not limited to this, and they do not have to be at equal intervals.

[0064] The six internal fastening portions 225 are provided radially between the internal flange sealing surface 223 and the internal flange contact surface 224. In other words, the internal flange sealing surface 223 is provided radially outward of the internal fastening portion 225, and the internal flange contact surface 224 is provided radially inward. To further explain, the pressing surface 261 of the internal screw seat 26 overlaps axially with the internal flange sealing surface 223 and the internal flange contact surface 224.

[0065] The internal projection 227 is adjacent to the inner flange sealing surface 223 in the radially outward direction DO. The internal projection 227 protrudes from the end face of the other axial side S2 of the cover body 21 to the other axial side S2. The internal projection 227 is cylindrical. The internal projection 227 has an inner surface 228 formed in the radially inward direction DI. The inner surface 228 is cylindrical with respect to the central axis J1. The inner surface 228 is positioned in contact with the sensor outer peripheral surface 426.

[0066] Furthermore, when the sensor flange portion 421 of the torque sensor 42 is positioned on the other axial side S2 of the inner flange portion 221 at the radially inner end of the first connection portion 22, the sensor fastening portion 425 and the inner fastening portion 225 of the internal screw seat 26 are positioned so that their central axes overlap in the axial direction. In this state, the fastening member Bt is inserted into the inner fastening portion 225 and screwed into the sensor fastening portion 425. As a result, the torque sensor 42 is fixed to the hub cover 20.

[0067] In other words, the fastening member Bt is a screw, and the first fastening portion 715, which is the sensor fastening portion 425, and the second fastening portion 725, which is the inner fastening portion 225, are holes into which the fastening member Bt is inserted. A screw seat 726 is provided on one of the first mating portion 711, which is the sensor flange portion 421, and the second mating portion 721, which is the inner flange portion 221, into contact with the screw head of the fastening member Bt. On the opposite side of the portion of the screw seat 726 into contact with the screw head are the first contact surface 714, which is the sensor flange contact surface 424 and the first sealing surface 713, which is the sensor flange sealing surface 423, or the second contact surface 724, which is the inner flange contact surface 224 and the second sealing surface 723, which is the inner flange sealing surface 223.

[0068] As a result, the torque sensor 42 is firmly fixed to the hub cover 20. At this time, the inner flange contact surface 224 of the first connection portion 22 and the sensor flange contact surface 424 of the sensor flange portion 421 make surface contact. This increases the frictional force between the sensor flange contact surface 424, which is the first contact surface 714, and the inner flange contact surface 224, which is the second contact surface 724, thereby increasing the torque transmission efficiency between the torque sensor 42, which is the first member 71, and the hub cover 20, which is the second member 72.

[0069] At this time, the inner flange sealing surface 223 of the first connection portion 22 and the sensor flange sealing surface 423 of the sensor flange portion 421 face each other in the axial direction with a gap between them. A space 229 is formed enclosed by the inner flange sealing surface 223, the sensor flange sealing surface 423, and the inner surface 228. The sealing member 61 is placed in this space 229.

[0070] This ensures that the sealing member 74 is securely positioned at the joint between the sensor flange end face 422, which is the first end face 712 of the rotating first member 71, the torque sensor 42, and the inner flange end face 222, which is the second end face 722 of the second member 72, the hub cover 20. This enhances the effect of suppressing the intrusion of foreign matter such as water, dust, and dirt into the motor. Furthermore, by arranging the contact portion formed by the first contact surface 714 and the second contact surface 724, and the space 73 in which the sealing member 74 is positioned between the first sealing surface 713 and the second sealing surface 723, with the fastening member Bt in between, the narrow portions of the first mating portion 711 and the second mating portion 721 can be effectively utilized. This allows for a miniaturization of the hub motor 100.

[0071] As described above, the hub motor 100 is used as the hub of the wheel 202 of the electric vehicle 200. Since the electric vehicle 200 runs outdoors, foreign matter such as water, dust, and dirt is present on the outside of the hub motor 100. These foreign matter can easily penetrate into the interior through the joints between the components. Foreign matter may penetrate into the interior through the joint between the torque sensor 42 and the cover body 21. Foreign matter that has entered through the joint between the sensor flange portion 421 of the torque sensor 42 and the cover body 21 moves into the interior through the joint between the inner surface 228 and the outer sensor surface 426. Therefore, by placing the sealing member 61 in the space 229, it is possible to suppress the penetration of foreign matter into the interior of the hub motor 100.

[0072] As the sealing member 61, a liquid gasket can be used. By using a liquid gasket, a reliable seal can be achieved without tearing in the circumferential direction, unlike when sealing is done by bonding with an adhesive. Furthermore, a sealing member can be formed by pouring it into narrow areas where it is difficult to place solid sealing members such as O-rings. This makes it possible to miniaturize and lighten the hub motor 100. As the liquid gasket, an ultraviolet-curing liquid gasket that hardens when irradiated with ultraviolet light can be used. However, it is not limited to this, and a wide range of liquid gaskets that do not leak out of gaps can be used. Also, if there is a sufficiently large gap in the part to be sealed, a solid sealing member may be used.

[0073] Furthermore, the sensor flange sealing surface 423 is connected to the sensor fastening portion 425. Also, the inner flange sealing surface 223 is connected to the inner fastening portion 225. In other words, the sensor flange sealing surface 423, which is the first sealing surface 713, is connected to the sensor fastening portion 425, which is the first fastening portion 715, and the inner flange sealing surface 223, which is the second sealing surface 723, is connected to the inner fastening portion 225, which is the second fastening portion 725.

[0074] This makes it possible to effectively utilize the narrow area between the first mating portion 711, which is the sensor flange portion 421, and the second mating portion 721, which is the inner flange portion 221, thereby enabling miniaturization of the hub motor 100.

[0075] <Connection between the second connection part 23 and the hub body 10> Details of the connection between the second connecting portion 23 and the hub body 10 will be described with reference to the drawings. Figure 7 is an enlarged cross-sectional view of the portion of the second connecting portion 23 including the screw seat 27. Figure 8 is an enlarged cross-sectional view of the portion of the second connecting portion 23 between the screw seats 27. In the connection between the second connecting portion 23 and the hub body 10, the radially inward DI is on one radial side, and the radially outward DO is on the other radial side.

[0076] The second connecting portion 23 has an outer flange portion 231 and an outer projection portion 237. The outer flange portion 231 is provided at the radial outer end of the cover body portion 21 and is annular in shape, extending radially outward DO.

[0077] A first member 71, which has a first mating portion 711 and rotates around a central axis J1 extending in the axial direction, and a second member 72, which has a second mating portion 721 connected to the first mating portion 711 of the first member 71 and rotates together with the first member 71 around the central axis J1, are connected. A fastening member Bt fastens the first member 71 and the second member 72 in the axial direction. Multiple fastening members Bt are provided. A sealing member 61 is positioned between the first member 71 and the second member 72. The second mating portion 721 has a projection 727 that extends in the axial direction and has a second side surface 720.

[0078] In the connection between the second connecting portion 23 and the hub body 10, the hub body 10 is the first member 71, and the end portion 110 on one axial side S1 of the cylindrical hub tube portion 11 of the hub body 10 is the first mating portion 711. The hub cover 20 is the second member 72, and the outer flange portion 231, which is the radially outward DO end of the hub cover 20, is the second mating portion 721.

[0079] The inner circumferential surface 111 of the hub cylinder portion 11 is the first side surface 710 and is cylindrical, located at one end in the radial direction. The outer surface 238 of the outward projection 237 of the second connecting portion 23 is in contact with the inner circumferential surface 111. The cylindrical end surface 112, which is the end surface of one axial side S1 of the hub cylinder portion 11, is provided with an annular cylindrical seal surface 113 located radially inward DI and an annular cylindrical contact surface 114 located radially outward DO from the cylindrical seal surface 113.

[0080] Furthermore, six cylindrical fastening portions 115 are provided on the cylindrical end face 112 of the hub cylindrical portion 11 of the hub body 10. The six cylindrical fastening portions 115 are arranged at equal intervals in the circumferential direction. The cylindrical fastening portions 115 are recessed holes in the axial direction. A fastening member Bt is fixed to the cylindrical fastening portion 115. The inner circumferential surface of the cylindrical fastening portion 115 is made up of a female thread into which the fastening member Bt can be screwed.

[0081] Specifically, a first fastening portion 715, which is a cylindrical fastening portion 115, is arranged circumferentially at the end 110 of the hub cylindrical portion 11, and a first contact surface 714, which is a cylindrical contact surface 114, is provided radially outward DO from the first fastening portion 715, which is a cylindrical fastening portion 115 at the end 110 of the hub cylindrical portion 11, and a first sealing surface 713, which is a cylindrical sealing surface 113, is provided radially inward DI from the first fastening portion 715, which is a cylindrical fastening portion 115.

[0082] To explain further, the first mating portion 711 has a cylindrical first side surface 710 provided at one end in the radial direction, an annular first sealing surface 713 provided at one end in the radial direction on the first end surface 712 on one side S1 in the axial direction and in contact with the sealing member 74, an annular first contact surface 714 provided on the first end surface 712 on the other radial side of the first sealing surface 713, and a plurality of first fastening portions 715 provided radially between the first contact surface 714 and the first sealing surface 713, arranged in the circumferential direction and accommodating the fastening member Bt.

[0083] The outer flange portion 231 has an outer flange end face 232 and six outer fastening portions 235. The outer flange end face 232 is the end face of one axial side S1 of the outer flange portion 231. The outer flange end face 232 is provided with an annular outer flange sealing surface 233 located radially inward DI and an annular outer flange contact surface 234 located radially outward DO from the outer flange sealing surface 233.

[0084] A recess 116 is formed in the cylindrical sealing surface 113, which is recessed in the axial direction. In this embodiment of the hub motor 100, the recess 116 is formed across the entire surface of the cylindrical sealing surface 113. The recess is formed in the cylindrical sealing surface 113, but it may also be formed in the outer flange sealing surface 233. Furthermore, it may be formed on both the cylindrical sealing surface 113 and the outer flange sealing surface 233.

[0085] Specifically, the outer fastening portion 235, which is the second fastening portion 725, is arranged circumferentially in the portion that overlaps axially with the end 110 of the hub cylinder portion 11 at the radially outward DO end of the hub cover 20. Furthermore, the outer flange contact surface 234, which is the second contact surface 724, is provided radially outward DO from the outer fastening portion 235, which is the second fastening portion 725, in the portion that overlaps axially with the end 110 of the hub cylinder portion 11, and the outer flange seal surface 233, which is the second seal surface 723, is provided radially inward DI.

[0086] To further explain, the second mating portion 721 has an annular second contact surface 724 provided on the second end face 722 of the other side S2 in the axial direction and in axial contact with the first contact surface 714, an annular second seal surface 723 provided on the second end face 722 and facing the first seal surface 713 in the axial direction and in contact with the seal member 74, and a plurality of second fastening portions 725 provided radially between the second contact surface 724 and the second seal surface 723 and arranged in the circumferential direction, which accommodate the fastening member Bt. At least one of the first seal surface 713 and the second seal surface 723 has a recess 716 that is recessed on the opposite side from the other.

[0087] The outer flange portion 231 is provided with six external screw seats 27. Each external screw seat 27 is provided with a pressing surface 271, which is the end face of the other side S2 in the axial direction. Each external screw seat 27 is provided with an external fastening portion 235 that penetrates from the center of the pressing surface 271 to the outer flange end face 232. The external fastening portion 235 is a through hole through which the fastening member Bt passes, and here, the inner circumferential surface is cylindrical. In the hub motor 100 of this embodiment, the six external screw seats 27 and external fastening portions 235 are arranged at equal intervals in the circumferential direction, but this is not limited to this arrangement, and they do not have to be at equal intervals.

[0088] The six external fastening portions 235 are provided radially between the outer flange sealing surface 233 and the outer flange contact surface 234. In other words, the external fastening portions 235 are provided radially on the inner side of the outer flange sealing surface 233 and radially on the outer flange contact surface 234. To further explain, the pressing surface 271 of the external screw seat 27 overlaps axially with the outer flange sealing surface 233 and the outer flange contact surface 234.

[0089] The external projection 237 is adjacent to the outer flange sealing surface 233 on the radially outward DO. The external projection 237 protrudes from the end face of one axial side S1 of the cover body 21 to the other axial side S2. The external projection 237 is cylindrical. The external projection 237 is provided with an outer surface 238 on the radially outward DO. The outer surface 238 is cylindrical with respect to the central axis J1.

[0090] Furthermore, when the hub cover 20 is positioned on the end 110 of the hub cylinder portion 11 of the hub body 10, the cylinder fastening portion 115 and the outer fastening portion 235 of the external screw seat 27 are positioned so that their central axes overlap in the axial direction. In this state, the fastening member Bt is inserted into the outer fastening portion 235 and screwed into the cylinder fastening portion 115. This fixes the hub cover 20 to the hub body 10.

[0091] In other words, the fastening member Bt is a screw, and the first fastening portion 715, which is the cylindrical fastening portion 115, and the second fastening portion 725, which is the outer fastening portion 235, are holes into which the fastening member Bt is inserted. A screw seat 726 is provided on one of the ends 110 of the hub cylindrical portion 11, which is the first mating portion 711, and the outer flange portion 231, which is the second mating portion 721, where the screw head of the fastening member Bt makes contact. On the opposite side of the portion of the screw seat 726 that the screw head makes contact is the first contact surface 714, which is the cylindrical contact surface 114 and the first sealing surface 713, which is the cylindrical sealing surface 113, or the second contact surface 724, which is the outer flange contact surface 234 and the second sealing surface 723, which is the outer flange sealing surface 233.

[0092] As a result, the hub cover 20 is firmly fixed to the hub body 10. At this time, the outer flange contact surface 234 of the second connecting portion 23 and the cylindrical contact surface 114 of the end 110 of the hub cylindrical portion 11 make surface contact. This increases the frictional force between the cylindrical contact surface 114, which is the first contact surface 714, and the outer flange contact surface 234, which is the second contact surface 724, thereby increasing the torque transmission efficiency between the hub body 10, which is the first member 71, and the hub cover 20, which is the second member 72.

[0093] At this time, the outer flange sealing surface 233 of the second connection portion 23 and the cylindrical sealing surface 113 of the end portion 110 of the hub cylindrical portion 11 face each other in the axial direction with a gap between them. A space 239 is formed enclosed by the outer flange sealing surface 233, the cylindrical sealing surface 113, and the outer surface 238. The sealing member 62 is placed in this space 239.

[0094] The sealing member 74 can be reliably positioned at the joint between the cylindrical end face 112, which is the first end face 712 of the hub body 10 (the rotating first member 71), and the outer flange end face 232, which is the second end face 722 of the hub cover 20 (the second member 72). This enhances the effect of suppressing the intrusion of foreign matter such as water, dust, and dirt into the motor. Furthermore, by arranging the contact portion formed by the first contact surface 714 and the second contact surface 724, and the space 73 in which the sealing member 74 is positioned between the first sealing surface 713 and the second sealing surface 723, with the fastening member Bt in between, the narrow portions of the first mating portion 711 and the second mating portion 721 can be effectively utilized. This allows for a miniaturization of the hub motor 100.

[0095] As described above, the hub motor 100 is used as the hub of the wheel 202 of the electric vehicle 200. The electric vehicle 200 runs outdoors. Therefore, foreign matter such as water, dust, and dirt is present on the outside of the hub motor 100. These foreign matter can easily penetrate into the interior through the joints between the components. In other words, foreign matter may penetrate into the interior through the joint between the hub body 10 and the hub cover 20. Foreign matter that has entered through the joint between the end 110 of the hub cylinder 11 and the cover body 21 moves into the interior through the joint between the inner circumferential surface 111 and the outer surface 238. Therefore, by placing the sealing member 62 in the space 239, it is possible to suppress the penetration of foreign matter into the interior of the hub motor 100.

[0096] As the sealing member 62, a liquid gasket can be used. By using a liquid gasket, a reliable seal can be achieved without tearing in the circumferential direction, unlike when sealing is done by bonding with an adhesive. Furthermore, a sealing member can be formed by pouring it into narrow areas where it is difficult to place solid sealing members such as O-rings. This makes it possible to miniaturize and lighten the hub motor 100. As the liquid gasket, an ultraviolet-curing liquid gasket that hardens when irradiated with ultraviolet light can be used. However, it is not limited to this, and a wide range of liquid gaskets that do not leak out of gaps can be used. Also, if there is a gap of sufficient size in the part to be sealed, a solid sealing member may be used.

[0097] Furthermore, the cylindrical sealing surface 113 is connected to the cylindrical fastening portion 115. Also, the outer flange sealing surface 233 is connected to the outer fastening portion 235. In other words, the cylindrical sealing surface 113, which is the first sealing surface 713, is connected to the cylindrical fastening portion 115, which is the first fastening portion 715, and the outer flange sealing surface 233, which is the second sealing surface 723, is connected to the outer fastening portion 235, which is the second fastening portion 725.

[0098] This makes it possible to effectively utilize the narrow area between the end 110 of the hub cylinder portion 11, which is the first mating portion 711, and the outer flange portion 231, which is the second mating portion 721, thereby enabling a miniaturization of the hub motor 100.

[0099] Various technical features disclosed herein can be modified in various ways without departing from the spirit of the technical creation. Furthermore, the multiple embodiments and modifications shown herein may be combined as possible.

[0100] <Summary> The present invention has the following configuration.

[0101] (1) A first member having a first mating portion and rotating around a rotation axis extending in the axial direction, A second member having a second mating portion connected to the first mating portion of the first member, and rotating together with the first member around a central axis, A plurality of fastening members that fasten the first member and the second member in the axial direction, It has a sealing member disposed between the first member and the second member, The first joint portion is, A cylindrical first side surface provided at one end in the radial direction, An annular first sealing surface is provided at the end on one side in the radial direction on the first end face in the axial direction and contacts the sealing member, An annular first contact surface provided on the first end face on the other radial side of the first sealing surface, It has a plurality of first fastening portions provided between the first contact surface and the first sealing surface in the radial direction and arranged in the circumferential direction, which house the fastening member, The second joint portion is, An annular second contact surface is provided on the second end face on the other side in the axial direction and contacts the first contact surface in the axial direction, An annular second sealing surface provided on the second end face, facing the first sealing surface in the axial direction and in contact with the sealing member, A plurality of second fastening portions are provided between the second contact surface and the second sealing surface in the radial direction, arranged in the circumferential direction, and housing the fastening member, It has a projection that extends in the axial direction and has a second surface that contacts the first surface, At least one of the first sealing surface and the second sealing surface has a recess that is recessed on the opposite side from the other, The sealing member is a motor positioned in the space enclosed by the first sealing surface, the second sealing surface, and the second side surface.

[0102] (2) The motor according to (1), wherein the first sealing surface is connected to the first fastening portion and the second sealing surface is connected to the second fastening portion.

[0103] (3) The fastening member is a screw, The first fastening portion and the second fastening portion are holes into which the fastening member is inserted. A screw seat is provided on one of the first and second mating portions, in which the screw head of the fastening member comes into contact. The motor according to (1) or (2), wherein the part of the screw seat opposite to the part that the head of the screw contacts is the first contact surface and the first sealing surface or the second contact surface and the second sealing surface.

[0104] (4) The sealing member is a liquid gasket, the motor according to any one of (1) to (3).

[0105] (5) A hub motor having a motor as described in any of (1) to (4), used in the wheels of an electric vehicle, The hub body and A hub cover that covers one end of the hub body in the axial direction, A torque sensor having a rotatable part attached to the axle, The torque sensor is the first member, and the sensor flange portion of the torque sensor that extends radially outward is the first mating portion. The hub cover is the second member, and the inner flange portion of the radially inward end of the hub cover is the second mating portion. The first fastening portions are arranged circumferentially on the sensor flange portion, and a first contact surface and a first sealing surface are provided radially outward from the first fastening portions on the sensor flange portion. A hub motor in which the second fastening portion is arranged circumferentially in a portion of the hub cover that overlaps axially with the inner flange portion of the radially inner end of the hub cover, and a second contact surface is provided radially outward from the second fastening portion in the portion of the hub cover that overlaps axially with the inner flange portion, and a second sealing surface is provided radially inward from the second fastening portion in the radial direction.

[0106] (6) A hub motor having a motor as described in any of (1) to (4), used in the wheels of an electric vehicle, The hub body and The hub body has a hub cover that covers one end of the hub body in the axial direction, The hub body is the first member, and the axial end of the cylindrical hub portion of the hub body is the first mating portion. The hub cover is the second member, and the radially outer end of the hub cover is the second mating portion. The first fastening portions are arranged circumferentially at the end of the hub cylinder portion, and a first contact surface is provided radially outward from the first fastening portions at the end of the hub cylinder portion, and a first sealing surface is provided radially inward from the first fastening portions at the end of the hub cylinder portion. A hub motor in which the second fastening portion is arranged circumferentially in the portion of the hub cover's radially outer end that overlaps axially with the end of the hub cylinder, and a second contact surface is provided radially outward from the second fastening portion in the portion that overlaps axially with the end of the hub cylinder, and a second sealing surface is provided radially inward from the second fastening portion in the portion that overlaps axially with the end of the hub cylinder.

[0107] (7)(5) or (6) An electric vehicle having wheels using hub motors as described in (7)(5) or (6). [Industrial applicability]

[0108] This invention can be used, for example, in electric vehicles that obtain driving force by electricity, such as electric assist bicycles, electric scooters, and electric wheelchairs. It can also be used in power generation hubs used in bicycles and the like. [Explanation of symbols]

[0109] 100 Hub Motor 200 electric vehicles 201 Car body 202 Wheels 202f Front Wheel 202r rear wheel 203 Power transmission mechanism 203a Drive gear 203b Driven gear 203c chain 204 Power supply section 205 Crank 206 pedals 207 Handle 208 Saddle 10 Hub body 101 Interior space 11 Hub cylinder section 110 End 111 Inner surface 112 Cylinder end face 113. Sealing surface of the cylindrical section 114 Cylinder contact surface 115 Cylinder fastening part 12 Hub bottom 121 Shaft Hole 13. First hub shaft 14. First hub bearing 20 Hub cover 21 Cover body 211 Through hole 22 First connection section 221 Inner flange section 222 Inner flange end face 223 Inner flange sealing surface 224 Inner flange contact surface 225 Internal fastening part 226 recesses 227 Inner protrusion 228 Inner surface 23 Second connection section 231 Outer flange section 232 Outer flange end face 233 Outer flange sealing surface 234 Outer flange contact surface 235 External fastening part 237 External protrusion 238 External surface 24. Second hub shaft 25. Second hub bearing 26 Screw Washer 261 Pressing surface 27 Screw Seat 271 Pressing surface 30 motors 31 Motor shaft 32 rotors 321 Rotor Core 322 Magnets 33 sleeves 34 One-way clutch 35 stata 351 Stator Core 352 Insulators 353 Coil 361 First motor cover 362 Second Motor Cover 371 First shaft bearing 372 Second shaft bearing 38 circuit boards 39 Bus Bar 40 Driven gear mounting section 41 Mounting cylinder section 42 Torque Sensor 421 Sensor flange section 422 Sensor flange end face 423 Sensor flange sealing surface 424 Sensor flange contact surface 425 Sensor fastening part 426 Sensor outer surface 50 Reduction mechanism 51 Sun Gear Section 52 Planetary Gear Section 521 First planetary gear 522 Second planetary gear 53 Internal gear section 54 Planetary Carriers 541 Planetary shaft 61, 62 Sealing members 71 First Member 710 1st side 711 First joint section 712 1st end face 713 First sealing surface 714 1st contact surface 715 1st fastening section 716 recess 72 Second Member 720 Second side 721 Second joint section 722 Second end face 723 Second sealing surface 724 Second contact surface 725 2nd fastening section 726 Screw Washer 727 Protrusion 728 recesses 73 Space 74 sealing member

Claims

1. A first member having a first mating portion and rotating around a rotation axis extending in the axial direction, A second member having a second mating portion connected to the first mating portion of the first member, and rotating together with the first member around a central axis, A plurality of fastening members that fasten the first member and the second member in the axial direction, It includes a sealing member disposed between the first member and the second member, The first joint portion is, A cylindrical first side surface provided at one end in the radial direction, An annular first sealing surface is provided at the end on one side in the radial direction on the first end face in the axial direction and contacts the sealing member, An annular first contact surface provided on the first end face on the other radial side of the first sealing surface, It has a plurality of first fastening portions provided between the first contact surface and the first sealing surface in the radial direction and arranged in the circumferential direction, which house the fastening member, The second joint portion is, An annular second contact surface is provided on the second end face on the other side in the axial direction and contacts the first contact surface in the axial direction, An annular second sealing surface provided on the second end face, facing the first sealing surface in the axial direction and in contact with the sealing member, A plurality of second fastening portions are provided between the second contact surface and the second sealing surface in the radial direction, arranged in the circumferential direction, and housing the fastening member, It has a projection that extends in the axial direction and has a second surface that contacts the first surface, At least one of the first sealing surface and the second sealing surface has a recess that is recessed on the opposite side from the other, The sealing member is a motor positioned in the space enclosed by the first sealing surface, the second sealing surface, and the second side surface.

2. The motor according to claim 1, wherein the first sealing surface is connected to the first fastening portion, and the second sealing surface is connected to the second fastening portion.

3. The fastening member is a screw, The first fastening portion and the second fastening portion are holes into which the fastening member is inserted. A screw seat is provided on one of the first and second mating portions, in which the screw head of the fastening member comes into contact. The motor according to claim 1, wherein the portion of the screw seat opposite to the portion that contacts the head of the screw is the first contact surface and the first sealing surface or the second contact surface and the second sealing surface.

4. The motor according to claim 1, wherein the sealing member is a liquid gasket.

5. A hub motor having the motor described in any one of claims 1 to 4, The hub body and A hub cover that covers one end of the hub body in the axial direction, A torque sensor having a rotatable part attached to the axle, The torque sensor is the first member, and the sensor flange portion of the torque sensor that extends radially outward is the first mating portion. The hub cover is the second member, and the inner flange portion of the radially inward end of the hub cover is the second mating portion. The sensor flange portion has the first fastening portion arranged in the circumferential direction, and the sensor flange portion has a first contact surface and a first sealing surface, both located radially outward from the first fastening portion. A hub motor in which the second fastening portion is arranged circumferentially in a portion of the hub cover that overlaps axially with the inner flange portion of the radially inner end of the hub cover, and a second contact surface is provided radially outward from the second fastening portion in the portion of the hub cover that overlaps axially with the inner flange portion, and a second sealing surface is provided radially inward from the second fastening portion in the radial direction.

6. A hub motor having the motor described in any one of claims 1 to 4, The hub body and The hub body has a hub cover that covers one end of the hub body in the axial direction, The hub body is the first member, and the axial end of the cylindrical hub portion of the hub body is the first mating portion. The hub cover is the second member, and the radially outer end of the hub cover is the second mating portion. The first fastening portions are arranged circumferentially at the end of the hub cylinder portion, and a first contact surface is provided radially outward from the first fastening portions at the end of the hub cylinder portion, and a first sealing surface is provided radially inward from the first fastening portions at the end of the hub cylinder portion. A hub motor in which the second fastening portion is arranged circumferentially in the portion of the hub cover's radially outer end that overlaps axially with the end of the hub cylinder, and a second contact surface is provided radially outward from the second fastening portion in the portion that overlaps axially with the end of the hub cylinder, and a second sealing surface is provided radially inward from the second fastening portion in the portion that overlaps axially with the end of the hub cylinder.

7. An electric vehicle having wheels using a hub motor as described in claim 5.

8. An electric vehicle having wheels using a hub motor as described in claim 6.

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