JP2020157837A - Wheel structure for in-wheel motor of vehicle - Google Patents

Abstract

To provide a wheel structure for an in-wheel motor of a vehicle which can cool the in-wheel motor immediately after the vehicle stops, is simple in a structure, and excellent in cooling performance.SOLUTION: A wheel structure for an in-wheel motor of a vehicle having a traveling drive in-wheel motor 10 in an internal space 6 of a wheel 5 of a wheel 2 comprises: a fan 20 rotatably supported to the wheel 5 coaxially therewith, rotating together with the wheel 5, and taking atmospheric air into the internal space 6 of the wheel 5; a fan-side magnet 25 arranged at the fan 20; and a wheel-side magnet 26 arranged at the wheel 5. The fan 20 is rotated together with the rotation of the wheel 5 during traveling by magnetic forces of the fan-side magnet 25 and the wheel-side magnet 26, the rotation of the fan 20 is permitted at a stop of the rotation of the wheel 5, and the fan 20 continues to rotate by an inertia, thus continuously taking the atmospheric air into the internal space 6.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cooling technique for an in-wheel motor of a vehicle.

In recent years, vehicles have been developed that employ an in-wheel motor that drives the wheels by a motor installed inside the wheels.
For example, in the vehicle described in Patent Document 1, a motor (in-wheel motor) is housed inside the wheel, and the wheel cap is further provided with a communication hole for communicating the outside and the inside of the wheel. Further, fins are provided on the wheel cap, and outside air is taken into the inside of the wheel by the fins rotated together with the wheel to cool the motor.

On the other hand, Patent Document 2 discloses a vehicle in which fins are provided on the wheels of the wheels. In Patent Document 2, the brake disc is cooled by the air passing through the inside of the wheel by taking the outside air into the inside of the wheel by the fins rotated together with the wheel.

JP-A-2009-292184 JP-A-59-143701

However, in Patent Documents 1 and 2, although the outside air can be taken into the wheel while the vehicle is running, the outside air cannot be taken into the wheel because the wheel does not rotate when the vehicle is stopped. Therefore, there is a problem that the motor cannot be cooled when the motor is still at a high temperature immediately after the vehicle is stopped.
The present invention has been made to solve such a problem, and a wheel structure for an in-wheel motor of a vehicle having a simple structure and excellent cooling performance can be cooled immediately after the vehicle is stopped. To provide.

In order to achieve the above object, the present invention is a wheel structure for an in-wheel motor of a vehicle provided with a traveling drive motor in the internal space of the wheel of the wheel, and is rotatably supported coaxially with the wheel. A fan that rotates together with the wheel to take in outside air into the internal space, and a fan rotation mechanism that rotates the fan with the rotation of the wheel while the vehicle is running, while allowing the fan to rotate when the wheel stops rotating. It is characterized by having a part and.

As a result, when the vehicle is running, the fan supported by the wheel rotates and the outside air is taken into the internal space of the wheel, so that the motor provided in the internal space of the wheel can be cooled with a simple structure. On the other hand, since the rotation of the fan is allowed when the vehicle is stopped, the fan that was rotating together with the wheel when the vehicle is running can continue to rotate due to inertia even immediately after the vehicle is stopped. Therefore, even immediately after the vehicle running is stopped and the rotation of the wheel is stopped, it is possible to take in outside air into the internal space of the wheel to cool the motor.

Preferably, the fan rotation mechanism portion may be composed of a magnet arranged on one of the fan and the wheel, and a magnetic material or a magnet arranged on the other side in the vicinity of the magnet.
As a result, the magnet arranged on one side of the fan and the wheel and the magnetic material or magnet arranged on the other side are attracted or repelled by the magnetic force, so that the fan can be rotated with the rotation of the wheel and the vehicle. Immediately after stopping, the fan can continue to rotate due to inertia. Therefore, the fan rotation mechanism can be realized with a simple configuration.

Preferably, the fan rotation mechanism unit is a one-way clutch provided between the fan and the wheel, and rotates the fan with the rotation of the wheel when the vehicle travels forward to stop the vehicle. Sometimes it is advisable to allow the wheel to rotate on the forward side of the fan.
As a result, the one-way clutch allows the fan to rotate with the rotation of the wheel when the vehicle is traveling forward, while the rotation of the fan in the forward direction with respect to the wheel is allowed when the vehicle is stopped, so that the inertia of the fan Rotation is allowed. Therefore, the fan rotation mechanism can be realized with a simple configuration.

Preferably, when the fan is rotated by the forward traveling of the vehicle, it is preferable that the outside air is taken into the internal space from the inside in the vehicle width direction and discharged toward the outside in the vehicle width direction.
As a result, when the vehicle is traveling forward, the outside air passes through the internal space of the wheel from the inside in the vehicle width direction to the outside in the vehicle width direction. Therefore, when the outside air is taken into the wheel, the outside air is taken from the outside in the vehicle width direction together with the outside air. It is possible to prevent pebbles and the like from entering the wheel. Therefore, it is possible to prevent pebbles and the like that are flipped up by an oncoming vehicle or a parallel vehicle from entering the wheel, and it is possible to protect the motor in the wheel.

Preferably, the fan is located at the outer end of the wheel in the vehicle width direction.
As a result, the fan can be efficiently rotated by the air flowing outside the width direction of the wheel while the vehicle is running, and the outside air can be efficiently taken into the wheel. Therefore, it is possible to improve the cooling performance of the in-wheel motor while the vehicle is running.

According to the wheel structure for the in-wheel motor of the vehicle of the present invention, the outside air is taken into the internal space of the wheel by rotating the fan together with the wheel when the vehicle is running, while the fan continues to rotate even immediately after the vehicle is stopped. The outside air can be taken into the internal space of the wheel, and the cooling performance of the motor can be improved with a simple structure.

It is a schematic structural drawing of the wheel part of the vehicle which adopted the wheel structure for the in-wheel motor of the 1st Embodiment of this invention. It is a vertical sectional view of the wheel which concerns on 1st Embodiment. It is a front view of the wheel seen from the outside in the vehicle width direction which concerns on 1st Embodiment. It is a front view of the wheel seen from the outside in the vehicle width direction which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic structural diagram of a wheel portion adopting the wheel structure for an in-wheel motor according to the first embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the wheel according to the first embodiment. FIG. 3 is a front view of the wheel as viewed from the outside in the vehicle width direction according to the first embodiment.
As shown in FIG. 1, the wheel 2 of the vehicle 1 adopting the wheel structure for the in-wheel motor of the present embodiment is suspended by the suspension device 3 on a vehicle body (not shown) of the vehicle 1.

The suspension device 3 is a so-called strut type suspension having, for example, a strut 3a, a lower arm 3b, and a knuckle 3c.
In the wheel 2, the in-wheel motor 10 for driving the vehicle travel is housed in the internal space 6 of the wheel 5 that supports the tire 4. The in-wheel motor 10 is an outer rotor type electric motor.

A brake rotor 11 is provided in the internal space 6 of the wheel 5.
As shown in FIG. 2, the in-wheel motor 10 has a rotor 12 and a stator 13.
The rotor 12 is formed in a cylindrical shape and has a permanent magnet embedded therein. The rotor 12 is fixed to the wheel 5 via a disk-shaped rotor bracket 14.

The stator 13 is formed in a cylindrical shape, and the inner peripheral surface of the rotor 12 and the outer peripheral surface of the stator 13 are arranged close to each other. An electromagnet is arranged on the stator 13.
The stator 13 is fixed to the knuckle 3c of the suspension device 3 via the stator bracket 15.
The brake rotor 11 is arranged inside the stator 13.

The brake rotor 11 has a disk shape, is rotatably supported by a boss portion 15a at the center of the stator bracket 15, and is fixed to the rotor bracket 14.
The brake caliper 16 provided with the brake pads 16a that sandwich the outer peripheral portion of the brake rotor 11 is fixed to the stator bracket 15.
As shown in FIGS. 2 and 3, a plurality of ventilation holes 18 are opened in the rotor bracket 14 in accordance with the positions of the holes 17 provided in the disc portion 5a of the wheel 5. The holes 17 and the ventilation holes 18 are arranged concentrically around the central axis of the wheel 5, for example, at intervals of predetermined angles from each other. Further, the stator bracket 15 is formed of a plurality of rod-shaped plate members extending outward in the radial direction at intervals of, for example, 90 degrees from the boss portion 15a. That is, the rotor bracket 14 and the stator bracket 15 have a structure in which air can pass axially through the internal space 6 of the wheel 5.

Further, inside the wheel 5 of the present embodiment, a fan 20 is provided along the outer side of the disc portion 5a of the wheel 5 in the vehicle width direction. The fan 20 is arranged at the outer end of the wheel 5 in the vehicle width direction.
The shaft portion 20a at the center of the fan 20 is rotatably supported with the central shaft portion 5b of the wheel 5 via the bearing 21. The fan 20 includes, for example, four blade portions 20b extending radially outward from the shaft portion 20a. As shown by the arrow of the two-point chain line in FIG. 2, the blade portion 20b takes in outside air from the inside in the vehicle width direction into the internal space 6 of the wheel 5 when the wheel 2 is rotated in the forward direction side, and the vehicle It is shaped to generate an air flow that discharges outward in the width direction.

Fan-side magnets 25 (fan rotation mechanism portions), which are permanent magnets, are arranged at the radial outer ends of each blade portion 20b of the fan 20. The fan-side magnet 25 has a cylindrical shape and is rotatably supported around a shaft 20c arranged parallel to the axis of the wheel 5 on the blade portion 20b.
Further, at the outer end of the rim portion 5c of the wheel 5 in the vehicle width direction, a wheel side magnet 26 (fan rotation mechanism portion) which is a permanent magnet is arranged in the vicinity of the outer end of the blade portion 20b of the fan 20. There is. The wheel-side magnet 26 has a cylindrical shape and is rotatably supported by a shaft 5d provided on the rim portion 5c of the wheel 5 and arranged parallel to the axis of the wheel 5. A plurality of wheel-side magnets 26 are arranged concentrically with respect to the axis of the wheel 5 at predetermined intervals.

The fan-side magnet 25 and the wheel-side magnet 26 are arranged slightly apart from each other. The fan-side magnet 25 and the wheel-side magnet 26 are attracted to or repelled by magnetic force, and the fan 20 rotates when the wheel 5 rotates.
With the above structure, the wheel 2 provided with the in-wheel motor 10 of the present embodiment includes a fan 20 that is supported by the wheel 5 and rotates together with the wheel 5 to take in outside air into the internal space 6 of the wheel 5. There is. As a result, when the vehicle 1 is running, the fan 20 supported by the wheel 5 rotates and the outside air passes through the internal space 6 of the wheel 5, so that the in-wheel motor 10 in the wheel 5 is cooled by a simple structure. be able to.

Further, the fan 20 is rotatably supported by the wheel 5, and the fan 20 rotates with the rotation of the wheel 5 when the vehicle 1 is running. Therefore, the fan 20 rotates when the vehicle 1 is running to cool the in-wheel motor 10. On the other hand, since the rotation of the fan 20 is allowed when the vehicle is stopped, the fan 20 can continue to rotate due to inertia immediately after the vehicle is stopped. As a result, even if the in-wheel motor 10 has a high temperature immediately after the vehicle is stopped, the fan 20 can continuously rotate to take in outside air into the internal space 6 of the wheel 5 and continue to cool the motor. It becomes. As a result, the cooling performance of the in-wheel motor 10 can be improved.

Further, since the fan 20 is provided with the fan-side magnet 25 and the wheel 5 is provided with the wheel-side magnet 26, and the fan-side magnet 25 and the wheel-side magnet 26 are arranged close to each other, the fan-side magnet 25 is provided. The fan 20 can be rotated as the wheel 5 rotates by attracting each other by the magnetic force of the wheel-side magnet 26. Further, since the fan-side magnet 25 and the wheel-side magnet 26 are arranged apart from each other, the fan 20 can be rotated with respect to the wheel 5. Therefore, immediately after the vehicle is stopped, the fan 20 can continue to rotate due to inertia. In this way, the fan-side magnet 25 and the wheel-side magnet 26 rotate the fan 20 together with the rotation of the wheel 5 when the vehicle 1 is running, while allowing the fan 20 to rotate when the wheel 5 stops rotating. It can be realized with a simple configuration.

Further, when the vehicle 1 is traveling forward, the outside air passes through the internal space 6 of the wheel 5 from the inside in the vehicle width direction to the outside in the vehicle width direction, so that pebbles and the like are inside the wheel 5 together with the outside air from the outside in the vehicle width direction of the wheel 5. It is possible to suppress the entry into. Therefore, the in-wheel motor 10 in the wheel 5 can be protected by a simple structure when the outside air is taken into the wheel 5 when the vehicle 1 is traveling forward.

Further, since the fan 20 is arranged at the outer end portion of the wheel 5 in the vehicle width direction, the fan 20 is efficiently rotated by the air flowing outside the vehicle width direction of the wheel 2 while the vehicle is running, and the outside air is supplied to the inside of the wheel 5. Can be taken in efficiently. Therefore, the cooling performance of the in-wheel motor 10 while the vehicle is running can be improved.
The present invention is not limited to the above embodiment.

For example, in the first embodiment, the blade portion 20b of the fan 20 is provided with a fan-side magnet 25, and the wheel 5 is provided with a wheel-side magnet 26. One of them is a magnet and the other is a magnetic material such as iron. It may be.
Further, with respect to the wheel-side magnet 26 or the magnetic material provided on the wheel 5 side, the shape, number, arrangement method, etc. may be appropriately set so that the blade portion 20b is rotated by the rotation of the wheel 5. The shape, arrangement method, and the like of the fan-side magnet 25 may be appropriately set.

Further, for example, as in the second embodiment shown in FIG. 4, a one-way clutch 30 is provided between the fan 20 and the wheel 5 in the first embodiment instead of the bearing 21 or together with the bearing 21. Good. The one-way clutch 30 restricts the fan 20 from rotating in the direction opposite to the forward direction side of the vehicle 1 with respect to the wheel 5, and allows the fan 20 to rotate in the forward direction side with respect to the wheel 5.

Therefore, when the vehicle moves forward, the fan 20 rotates together with the wheel 5, and although the rotation of the wheel 5 stops immediately after the vehicle stops, the fan 20 can continue to rotate in the forward direction due to inertia. As a result, as in the first embodiment, the fan 20 can continuously rotate even immediately after the vehicle is stopped to guide air to the in-wheel motor 10 for cooling. Further, by providing such a one-way clutch 30, the fan side magnet 25 and the wheel side magnet 26 are not required, and the structure of the wheel 2 such as the wheel 5 can be made simpler.

Further, the detailed shapes of the in-wheel motor 10 and the fan 20 can be changed as appropriate.
The present invention can be widely applied to the wheels of a vehicle equipped with an in-wheel motor.

1 Vehicle 2 Wheels 5 Wheels 10 In-wheel motor (motor)
20 fan 25 fan side magnet (fan rotation mechanism)
26 Wheel side magnet (fan rotation mechanism)
30 One-way clutch (fan rotation mechanism)

Claims (5)

It is a wheel structure for in-wheel motors of vehicles equipped with a motor for driving driving in the internal space of the wheel of the wheel.
A fan that is rotatably supported coaxially with the wheel and rotates with the wheel to take in outside air into the internal space.
A fan rotation mechanism unit that rotates the fan with the rotation of the wheel when the vehicle is running, while allowing the fan to rotate when the wheel stops rotating.
Wheel structure for in-wheel motors of vehicles characterized by being equipped with. The first aspect of claim 1 is characterized in that the fan rotation mechanism unit is composed of a magnet arranged on one of the fan and the wheel, and a magnetic material or a magnet arranged on the other side in the vicinity of the magnet. Wheel structure for in-wheel motors of vehicles described. The fan rotation mechanism unit is a one-way clutch provided between the fan and the wheel, and rotates the fan with the rotation of the wheel when the vehicle is traveling forward, and the wheel when the vehicle is stopped. The wheel structure for an in-wheel motor of a vehicle according to claim 1, wherein the fan is allowed to rotate in the forward direction. Any of claims 1 to 3, wherein the fan takes in outside air from the inside in the vehicle width direction into the internal space and discharges it toward the outside in the vehicle width direction when the fan rotates due to the forward traveling of the vehicle. The wheel structure for an in-wheel motor of a vehicle according to item 1. The wheel structure for an in-wheel motor of a vehicle according to any one of claims 1 to 4, wherein the fan is arranged at an outer end portion of the wheel in the vehicle width direction.

Images