JP6347456B2 - Motor and electric vehicle - Google Patents

Description

  The present invention relates to a wheel-in motor that drives wheels by a motor provided in a vehicle wheel, and more particularly to an electric vehicle such as an electric vehicle, a hybrid vehicle, and an electric bicycle.

  In Patent Document 1 and Patent Document 2, a cylindrical coil body is fixed to a coil body support member fixed to a shaft, and a cylindrical outer yoke having a magnet fixed to the inner periphery is provided on the outer periphery side of the coil body. In a wheel-in motor in which an outer yoke is fixed to a wheel, it is disclosed to rotate the wheel by energizing a coil body.

  On the other hand, in order to increase the magnetic flux density of the magnet acting on the coil body, it has been considered to provide a cylindrical inner yoke on the inner peripheral side of the cylindrical coil body. When the inner yoke is provided, it is generally provided integrally with the outer yoke in order to circulate the magnetic flux of the magnet.

Japanese Utility Model Publication No. 5-22133 JP 2006-246678 A

  However, when the inner yoke is provided integrally with the outer yoke on the inner peripheral side of the coil body, there is a problem that it is difficult to assemble the coil body support member and the coil body.

  Therefore, an object of the present invention is to provide a wheel-in motor and an electric vehicle that can be provided with an inner yoke to increase the magnetic flux density acting on the coil body and are easy to assemble.

The invention described in claim 1
A shaft, a cylindrical coil body in which the shaft is inserted on the inner periphery side, a coil body support member that is fixed to the shaft and supports the coil body, a cylindrical outer yoke disposed on the outer periphery side of the coil body, and the inner yoke of a cylindrical shape disposed on the inner peripheral side of the coil body, a makes the chromophore at the distal end over data and a magnet placed to face the coil member fixed to the outer yoke or the inner yoke,
The outer yoke has a disc-shaped bottom surface portion that forms a bottom surface at one end of a cylinder and a disk-shaped lid portion that forms a bottom surface at the other end, and the inner peripheral side ends of the bottom surface portion and the lid portion are used as shafts. The inner yoke is rotatably attached to the shaft, and the inside of the space sealed by the disc-shaped bottom surface portion of the outer yoke, the cylinder, and the disc-shaped lid portion. the inner yoke, the coil body and the magnet have been accommodated in, the energization of the coil body, the inner yoke and outer yoke are features and to makes the chromophore at the distal end over data from rotating relative to the shaft.

The invention described in claim 2
An electric vehicle further comprising a vehicle wheel, wherein the motor according to claim 1 is disposed on an inner peripheral side of the wheel, and the wheel of the vehicle is fixed to the outer yoke of the motor.

  According to the first aspect of the present invention, since the inner yoke is provided on the inner peripheral side of the coil body, the magnetic flux density at which the magnet acts on the coil body can be increased by the outer yoke and the inner yoke. Torque can be increased.

For the assembly of the wheel-in motor, for example, the coil body support member is fixed to the shaft, the inner yoke is rotatably attached to the shaft, and then the coil body is disposed on the outer periphery of the inner yoke and fixed to the coil body support member. Next, an outer yoke having a magnet fixed to the outer periphery of the coil body is rotatably attached to the shaft, and the outer yoke is fixed to the wheel.
Accordingly, the inner yoke and the outer yoke can be attached without disturbing the coil body and the coil body supporting member, and the assembly of the wheel-in motor can be facilitated.

  According to the invention described in claim 2, it is possible to provide an electric vehicle having the function and effect described in claim 1.

It is a longitudinal cross-sectional view which shows the half side of the wheel-in motor concerning embodiment of this invention with respect to a shaft.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. The wheel-in motor 1 according to the present embodiment is provided in the wheel 5 of each wheel 3 of the four wheels of the electric automobile, and a tire 7 is attached to the outer periphery of the wheel 5 to electrically drive each wheel 3. Is.
The wheel-in motor 1 includes a stator disk 11 fixed to the shaft 9, a coil body 13 fixed to the stator disk 11, an outer yoke 15 disposed on the outer peripheral side of the coil body 13, and an inner side of the coil body 13. The inner yoke 17 is provided.

  A hollow 19 for wiring is formed in the shaft 9, and a lead wire 21 energizing the coil body 13 is connected from the hollow 19 of the shaft 9 to the inner space of the outer yoke 15 to the coil body 13.

The stator disk 11 has a disk shape, and a hole formed in the center of the disk is passed through the shaft 9 and is fixed to the shaft 9 with a key 12.
The coil body 13 has a cylindrical shape. For example, a copper plate formed into a linear shape by etching is insulated and stacked in multiple layers. One end of the coil body 13 is fixed to the outer periphery of the stator disk 11.

  The outer yoke 15 includes a main body 27 and a lid 29 fixed to the main body 27 with screws. The main body portion 27 is provided on the outer periphery of the coil body 13 and includes a cylindrical tubular portion 27a and a bottom surface portion 27b. The cylindrical part 27 a is arranged on the outer periphery of the coil body 13 with a space between the coil body 13. A magnet 31 is provided on the inner peripheral side surface of the cylindrical portion 27 a, and the magnet 31 is disposed facing the coil body 13. The magnet 31 is magnetized by a plurality of magnetic poles so that the magnetic poles are different in the circumferential direction.

  An insertion hole for the shaft 9 is formed at the center of the bottom surface portion 27b. The shaft 9 is inserted into the insertion hole, and the bottom surface portion 27b is fixed to the bearing 35 with a screw 37. The bottom surface portion 27 b is fixed to the wheel 5 with a screw 33 that is disposed on the inner surface of the wheel 5 and is fixed from the outside of the wheel 5.

  The lid portion 29 has a disk shape, and an insertion hole for the shaft 9 is formed at the center. The shaft 9 is inserted into the insertion hole and fixed to the bearing 41 with a screw 43. Further, the outer peripheral portion of the lid portion 29 is fixed to the cylindrical portion 27a with a screw 45.

The inner yoke 17 is composed of a cylindrical yoke body 17a disposed opposite to the magnet 31 via the coil body 13, and a support portion 17b. A plurality of support portions 17b are provided radially from the base end portion 18. The base end portion 18 is fixed to the bearing 47 of the shaft 9 with a screw 49.
The outer yoke 15, the inner yoke 17 and the shaft 9 are all made of a magnetic material and form a magnetic flux path.

Next, assembly of the wheel-in motor 1 according to the embodiment of the present invention into the wheel 5 and operational effects will be described.
The wheel-in motor 1 is assembled by inserting the lid 29 of the outer yoke 15 into the shaft and fixing it to the bearing 41 of the shaft 9 with screws 43, and then fixing the stator disk 11 to which the coil body 13 is fixed with the key 12 to the shaft 9 The support portion 17b of the inner yoke 17 is fixed to the bearing 47 with a screw 49. Thereafter, the main body portion 27 of the outer yoke 15 is assembled. The main body portion 27 is assembled by arranging the cylindrical portion 27a on the outer peripheral side of the coil body 13 and passing the shaft through the hole in the bottom surface portion 27b and fixing it to the shaft 9. The bearing 35 is fixed with a screw 37.

  Next, after fixing the main body portion 27 of the outer yoke 15 to the lid portion 29 with screws 45, the bottom surface portion 27 b of the outer yoke 15 is fixed to the wheel 5 with screws 33.

  The wheel-in motor 1 is driven by energizing the coil body 13 via the lead wire 21, so that an electromagnetic force generated with respect to the magnetic field between the magnet 31 and the inner yoke 17 causes the magnet to the coil body 13. 31 rotates together with the outer yoke 15, and the wheel 5 fixed to the outer yoke 15 rotates with respect to the shaft 9. At the same time, the inner yoke 17 also rotates to synchronize with the outer yoke 15.

  The magnetic flux path of the magnet 31 forms a loop that passes from the opposed inner yoke 17 to the shaft 9 and the outer yoke.

  According to the present embodiment, since the inner yoke 17 and the outer yoke 15 are separated from each other, it is easy to assemble even if the inner yoke 17 is provided inside the coil body 13 by individually attaching to the shaft 9. Can be.

In the present embodiment, the magnetic flux acting on the coil body 13 by the magnet 31 forms a loop that flows through the passage formed by the inner yoke 17, the shaft 9 and the outer yoke 15, so that the magnetic flux density acting on the coil body 13 is increased. be able to. Thereby, the torque which acts on the wheel 5 can be increased compared with the case where the inner yoke 17 is not provided.
In the present embodiment, the outer yoke 15 is watertight inside by the lid portion 29 and the main body portion 27, so that foreign matter can be prevented from entering the outer yoke 15 and is excellent in waterproofing.

  Since the inner yoke 17 is a separate body from the outer yoke 15 and is provided so as to be rotatable with respect to the shaft 9. Flows and regenerative braking is applied. When the wheel 5 is rotating, a magnetic force for pulling back the magnet 31 acts on the inner yoke 17, so that the rotation of the outer yoke 15 can be suppressed, so that it can act as an auxiliary brake.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the outer yoke 15 may be configured to form an air vent hole for internal cooling without taking a sealed structure.
The body portion 27 of the outer yoke may be one in which the cylindrical portion 27a and the bottom surface portion 27b are separated and fixed with screws or the like.
Each of the screws 37, 43, and 45 may be a bolt.

DESCRIPTION OF SYMBOLS 1 Wheel in motor 5 Wheel 9 Shaft 13 Coil body 11 Stator disk (coil body support member)
15 Outer yoke 17 Inner yoke 27 Body portion 27b Bottom portion 29 Lid portion 31 Magnet

Claims (2)

A shaft, a cylindrical coil body in which the shaft is inserted on the inner periphery side, a coil body support member that is fixed to the shaft and supports the coil body, a cylindrical outer yoke disposed on the outer periphery side of the coil body, and the inner yoke of a cylindrical shape disposed on the inner peripheral side of the coil body, a makes the chromophore at the distal end over data and a magnet placed to face the coil member fixed to the outer yoke or the inner yoke,
The outer yoke has a disc-shaped bottom surface portion that forms a bottom surface at one end of a cylinder and a disk-shaped lid portion that forms a bottom surface at the other end, and the inner peripheral side ends of the bottom surface portion and the lid portion are used as shafts. The inner yoke is rotatably attached to the shaft, and the inside of the space sealed by the disc-shaped bottom surface portion of the outer yoke, the cylinder, and the disc-shaped lid portion. the inner yoke, a coil body and a magnet is housed, the energization of the coil body, wherein the to makes the chromophore at the distal end over data that inner yoke and the outer yoke is rotated relative to shaft. An electric vehicle further comprising a vehicle wheel, wherein the motor according to claim 1 is disposed on an inner peripheral side of the wheel, and the wheel of the vehicle is fixed to the outer yoke of the motor.

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