JP5224507B2 - Axle structure of electric vehicle - Google Patents

Description

  The present invention relates to an axle structure of an electric vehicle applied to an outer rotor motor type in-wheel motor structure.

  An in-wheel motor is known as a prior art. This in-wheel motor is generally provided with a brake on the outer diameter side of the speed reducer. However, if the brake is disposed on the outer diameter side of the reduction gear, the diameter of the wheel is increased correspondingly and the diameter of the wheel is increased. In order to make the wheel compact, it is necessary to reduce both the axle (shaft) direction and the radial direction of the wheel. It is known that the shaft direction can be made compact by using an outer rotor motor that does not have a speed reduction mechanism. However, since a brake (disc brake) is generally braked by a caliper on the outer diameter side of the motor, the brake is By being housed in the wheel, an increase in the diameter of the wheel cannot be avoided and a reduction in size cannot be achieved.

  Patent Document 1 describes a structure in which the position of a brake is provided on the inner diameter side of the outer rotor motor. However, a space for this is required on the inner diameter side of the outer rotor motor, and the structure of Patent Document 1 cannot ultimately reduce the wheel in the radial direction.

  Further, when the disc brake is stored in the wheel, it is troublesome to inspect brake components such as the disc pad. Further, when the disc brake is housed in the wheel, the motor and the brake are close to each other, and the influence of heat generated by the both may adversely affect each other.

  On the other hand, Patent Document 2 discloses a structure in which a parking brake is formed inside the motor (vehicle side). However, since the structure described in Patent Document 2 uses an in-wheel motor, the wheel spreads in the direction of the axle, and a normal brake structure is disposed in the wheel. It will not be planned.

JP 2006-1373 A JP 2006-199107 A

  The present invention is based on the above-described prior art, is designed to be compact in the wheel shaft direction and radial direction, easily inspect brake components, and the heat generated by the brake and the motor does not have the possibility of affecting each other. It aims at providing the axle structure of a motor vehicle.

In order to achieve the object, in the invention of claim 1, a wheel to which a tire is attached, an outer rotor motor housed in the wheel, an inner side of the vehicle body than the wheel and the outer rotor motor, A knuckle attached to the vehicle body via an upper arm and a lower arm; and a disc brake for braking the rotation of the wheel. A knuckle spindle is provided outside the knuckle, and the outer rotor is disposed on an outer periphery of the knuckle spindle. The stator of the motor is fixed, and the shaft that is the shaft of the wheel and the outer rotor motor is inserted into a through hole provided inside the knuckle spindle, and the shaft can be rotated through a bearing in the through hole. Supported, its inner end penetrates the knuckle Is extended to the inside of the knuckle, the disc brake fixed to the shaft, is disposed inside the vehicle body than said knuckle, disc of the disc brake, the vehicle body side end portion of said shaft The wheel shaft and the rotor of the outer rotor motor are fixed to the outer end portion of the shaft relative to the vehicle body .

The invention of claim 2 is characterized in that, in the invention of claim 1, the disc of the disc brake is attached to the shaft via a hub at the center thereof .

According to a third aspect of the present invention, in the first or second aspect of the present invention, the bearings are provided at two positions spaced apart from each other in the longitudinal direction of the shaft .

  According to the first aspect of the present invention, since the disc brake is provided on the vehicle body side with respect to the knuckle, the mechanism constituting the brake is not housed in the wheel but is disposed between the vehicle body and the wheel. Therefore, the radial size of the wheel can be reduced, and the wheel can be made compact. In addition, since the brake parts can be inspected without removing the wheel, work such as repair is facilitated. Further, since the distance between the brake and the motor can be increased, it is possible to prevent the mutual heat generation from affecting each other.

Further, since the disc brake is provided on the vehicle body side with respect to the knuckle, the mechanism constituting the brake is not housed in the wheel but is disposed between the vehicle body and the wheel. Therefore, the radial size of the wheel can be reduced, and the wheel can be made compact. In addition, since the brake parts can be inspected without removing the wheel, work such as repair is facilitated. Further, since the distance between the brake and the motor can be increased, it is possible to prevent the mutual heat generation from affecting each other. Further, since the shaft is supported through the bearing in the through hole of the knuckle spindle, the shaft is securely supported by the knuckle spindle.

  The present invention relates to a wheel for attaching a tire, an outer rotor motor housed in the wheel, an inner side with respect to the vehicle body than the wheel and the outer rotor motor, and an upper arm and a lower arm with respect to the vehicle body. And a disc brake for braking the rotation of the wheel, a shaft serving as a shaft of the wheel and the outer rotor motor is inserted into the knuckle, and the disc brake is attached to the shaft. On the other hand, it is the axle structure of the electric vehicle fixed inside with respect to a vehicle body rather than the said knuckle.

  FIG. 1 is a schematic sectional view of an axle structure of an electric vehicle according to the present invention, and FIG. 2 is a schematic perspective view.

  As shown in the figure, the axle structure of the electric vehicle according to the present invention includes a wheel 10 that houses the outer rotor motor 1, a knuckle 4, and a disc brake 7. The outer rotor motor 1 includes a stator 2 and a rotor 3 outside the stator 2. A coil 5 is wound around the stator 2. The wheel 10 includes a substantially cylindrical rim 8 and a disk 9. If the rim 8 of the wheel 10 and the rotor 3 are integrated, the number of parts can be reduced, the structure is simplified, and the handling is improved.

The shaft 11 is inserted into the brake rotor 71 of the outer rotor motor 1, the knuckle 4, and the disc brake 7. The disk 9 of the wheel 10 is fixed to the flange 12 provided at the end of the shaft 11 with bolts 13. The flange 12 is fixed to a motor cover 15 that covers the outside of the motor 1 with bolts 14. Therefore, when the rotor 3 rotates, the rotation is transmitted in the order of the motor cover 15, the flange 12, and the wheel 10, and the tire 6 attached to the rim 8 rotates. The stator 2 is fixed to the inner knuckle spindle 17 with screws 18. Knuckle spindle 17, a through hole 17a penetrating in the axial direction is formed, and the shaft 11 is inserted into the through hole 17a. A bearing 24 is interposed between the through-hole 17 a of the knuckle spindle 17 and the shaft 11. Thereby, the shaft 11 is reliably supported by the knuckle spindle 17.

The end of the knuckle spindle 17 is fixed to the knuckle 4 by a bolt 26. The lower part of the knuckle 4 is connected to the lower arm 22 via the ball joint 21. The lower arm 22 is connected to a suspension mounting portion (not shown). Further, the upper part of the knuckle 4 is connected to the upper arm 20 via the ball joint 19. The upper arm 20 is also connected to a suspension mounting portion (not shown). Therefore, the knuckle 4 can swing.

  The disc brake 7 includes a brake rotor 71 and a caliper 72. The brake rotor 71 has an annular shape and is attached to the shaft 11 via the hub 23. This attachment position is on the inside of the vehicle body relative to the knuckle 4, that is, on the vehicle body side of the shaft 11 (left side in the figure). The hub 23 is fixed to the shaft 11, and the brake rotor 71 is fixed to the hub 23 by hub bolts 25. Therefore, the brake rotor 71 rotates together with the shaft 11. The brake rotor 71 is clamped at its outer periphery by the caliper 72 and stopped rotating. Thereby, the rotation of the tire 6 is braked.

  As described above, the disc brake 7 is provided closer to the vehicle body than the knuckle 4. For this reason, the brake rotor 71 and the caliper 72 which are the mechanisms constituting the disc brake 7 are not housed in the wheel 10 but are disposed between the vehicle body frame and the wheel 10. Therefore, the radial size of the wheel 10 can be reduced, and the wheel 10 can be made compact. In particular, an in-wheel motor that houses the outer rotor motor 1 is preferable because the rim 8 can be directly attached to the outer surface of the motor cover 15.

  Further, by effectively utilizing the space in the wheel 10 that is generated by not housing the disc brake 7, many windings can be wound around the stator 2, and the large coil 5 can be formed. In addition, since the brake parts can be inspected without removing the wheel 10, work such as repair is facilitated. Further, since the distance between the disc brake 7 and the outer rotor motor 1 can be increased, it is possible to prevent mutual heat generation from affecting each other.

1 is a schematic sectional view of an axle structure of an electric vehicle according to the present invention. 1 is a schematic perspective view of an axle structure of an electric vehicle according to the present invention.

Explanation of symbols

1: outer rotor motor, 2: stator, 3: rotor, 4: knuckle, 5: coil, 6: tire, 7: disc brake, 8: rim, 9: disc, 10: wheel, 11: shaft, 12: flange , 13: bolt, 14: bolt, 15: motor cover, 16 :, 17: knuckle spindle, 18: screw, 19: ball joint, 20: upper arm, 21: ball joint, 22: lower arm, 23: hub, 24 : Bearing, 25: Hub bolt, 26: Bolt, 71: Brake rotor, 72: Caliper

Claims (3)

A wheel for attaching a tire;
An outer rotor motor housed in the wheel;
A knuckle inside the vehicle body from the wheel and the outer rotor motor and attached to the vehicle body via an upper arm and a lower arm;
A disc brake for braking the rotation of the wheel,
A knuckle spindle is provided on the outer side of the knuckle, the stator of the outer rotor motor is fixed to the outer periphery of the knuckle spindle, and a shaft serving as an axis of the wheel and the outer rotor motor is provided in a through hole provided on the inner side of the knuckle spindle. Is inserted, and the shaft is rotatably supported through a bearing in the through hole, and the inner end extends through the knuckle to the inside of the knuckle.
The disc brake is disposed on the inner side with respect to the shaft than the knuckle with respect to the shaft, and the disc of the disc brake is fixed to a vehicle body side end portion of the shaft,
An axle structure of an electric vehicle , wherein the wheel and a rotor of the outer rotor motor are fixed to an outer end portion of the shaft relative to a vehicle body . The axle structure of the electric vehicle according to claim 1, wherein the disc of the disc brake is attached to the shaft via a hub at a central portion thereof . The axle structure of the electric vehicle according to claim 1 or 2, wherein the bearings are provided at two positions in the longitudinal direction of the shaft and spaced from each other .