JP7365192B2 - Wheel-integrated electric system - Google Patents

Description

The present invention relates to a wheel built-in electric system, and more particularly to a wheel built-in electric system used as a drive source for a moving object.

In recent years, the electrification of moving objects has been progressing, and wheel-embedded electric systems (also called power wheels), which have motors and inverters built into the wheels, are expected to be increasingly applied in the future. This power wheel needs to have a sealed structure from a waterproof perspective. Additionally, in the event of a power wheel failure, it is necessary to make it easy to attach and detach the power wheel. Therefore, the wiring that supplies power to the inverter requires a connector. A technique related to connection reliability of a connector is described in Patent Document 1. However, if the connector is not installed in an appropriate position, vibration may cause a connection failure.

Japanese Patent Application Publication No. 2016-101854

An object of the present invention is to improve the vibration resistance of a wheel built-in electric system using a connector.

In order to solve the above problems, a wheel built-in electric system according to the present invention includes a wheel connected to a tire of a moving object, and a motor provided in the wheel, and the wheel has an electric power source connected to the motor. A first direction is the direction from the front side to the rear side of the moving body, and a first direction is a line segment passing through the rotation center position of the rotating part of the wheel and parallel to the first direction. A line segment that passes through the rotation center position and is perpendicular to the first line segment is defined as a second line segment, and the connector is located above the first line segment and above the second line segment. The connector is arranged in the first region on the rear side of the vehicle, and the connector includes a wheel-side connector connected to the wheel side and a wiring-side connector connected to wiring connected to the vehicle body. The ground side of the line segment and the front side of the second line segment are defined as a second region, and the connector is configured such that the wiring side connector is inserted from the second region toward the first region. It is composed of

According to the present invention, the vibration resistance of a wheel built-in electric system can be improved. Other effects and combinations of effects produced by the present invention will be explained in the detailed description.

FIG. 1 is an overall perspective view of a wheel 100 with a built-in electric system according to the present embodiment. FIG. 2 is a cross-sectional view of the electric system built-in wheel 100 viewed from the direction of the arrow on the plane S in FIG. 1. FIG. FIG. 2 is a side view of the electric system built-in wheel 100 for illustrating the state of vibration propagation. FIG. 3 is a detailed internal view of the connector 106 and the wiring side connector 200 according to the present embodiment. FIG. 7 is a detailed internal view of a connector 106 and a wiring-side connector 200 according to another embodiment. FIG. 7 is an overall perspective view of a wheel 100 with a built-in electric system according to another embodiment.

Examples will be described below using FIGS. 1 to 6.

FIG. 1 is an overall perspective view of a wheel 100 with a built-in electric system according to this embodiment. FIG. 2 is a cross-sectional view of the electric system built-in wheel 100 viewed from the direction of the arrow on the plane S in FIG. FIG. 3 is a side view of the electric system built-in wheel 100 for showing the state of vibration propagation.

The electric system built-in wheel 100 includes a tire 102 and a wheel portion 101 connected to the tire 102.

As shown in FIG. 2, the wheel fixing portion 101b does not rotate in conjunction with the rotation of the tire 102, and forms a storage space for electric system components, which will be described later.

The electric system component in this embodiment includes a motor 104 that generates driving force for a moving body, and an inverter 105 that supplies alternating current power to the motor 104. Further, in addition to the motor 104 and the inverter 105, a battery that supplies DC power may be added to the electric system components.

The shaft 103 is connected to a rotor section (not shown) of a motor 104 and rotates together with the rotor section. The wheel rotation unit 101a is connected to the tire 102 and the shaft 103, and rotates together with the shaft 103. Note that the wheel rotating portion 101a forms part of a storage space for electric system components.

The connector 106 has an internal connection part 106a that is connected to the outer surface of the wheel fixing part 101b and extends to the storage space of the wheel fixing part 101b. Internal connection portion 106a is connected to inverter 105. Further, an external connection portion 106b provided on the connector 106 is arranged on the outer surface side of the wheel fixing portion 101b and is connected to the wiring side connector 200. The wiring side connector 200 is connected to a power wiring 201 that transmits DC power.

As shown in FIGS. 1 and 3, the first direction 301 is defined as a direction from the front side to the rear side of the moving body. The second direction 302 is defined as a direction from the ground side to the top side. Here, the front side of the moving body is the side that is mainly in the traveling direction based on the gear ratio and external shape of the moving body. More specifically, this is a case where the gear ratio of the moving object is set so that the speed is greater when moving forward than when moving backward. Alternatively, the outer shape of the moving body is streamlined to reduce air resistance, and the tapered side of the streamline is the front side.

The first line segment 401 is a line segment that passes through the rotation center position of the shaft 103 and is parallel to the first direction 301. The second line segment 402 is a line segment that passes through the center of rotation of the shaft 103 and is perpendicular to the first line segment 401 .

The principle of the invention according to this embodiment will be explained. Assuming that an obstacle 404 such as a pebble is placed in an area on the ground side of the first line segment 401 and in front of the second line segment 402, the propagation intensity of vibrations generated in the area is It is the largest, and becomes smaller as it moves towards the rear sky.

That is, when the tire vibration propagation 403 when there is an obstacle 404 on the road is divided into four parts starting from the rotation center position of the shaft 103, it becomes larger on the front ground side in the traveling direction and smaller on the rear top side. This is because the speed of the moving object is often set faster when moving forward than when moving backward.

Therefore, the connector 106 according to the present embodiment is arranged in a first region on the top side of the first line segment 401 and on the rear side of the second line segment 402. Thereby, the vibration resistance of the connection between the connector 106 and the wiring side connector 200 can be improved.

The lower arm 202 is connected to the lower side of the first line segment 401 at the wheel fixing portion 101b. The shock absorber 203 is connected to the upper side of the first line segment 401 at the wheel fixing portion 101b. Spring 204 is connected between the vehicle body of the moving object and shock absorber 203.

As shown in FIG. 1, in this embodiment, the power wiring 201 is provided so as to be supported by a shock absorber 203. Thereby, vibration of the power wiring 201 can be suppressed.

FIG. 4 is a detailed internal view of the connector 106 and the wiring side connector 200 according to this embodiment.

An arrow 205 indicates the insertion direction of the wiring side connector 200. The wiring side connector 200 has a positive side pin 201P, a negative side pin 201N, and a control pin 201S that transmits a control signal related to the inverter 105. Thereby, the vibration resistance of control-related wiring and connections connected to the control pin 201S can also be improved.

Further, the area on the ground side of the first line segment 401 and the front side of the second line segment 402 is defined as a second area, and the wiring side connector 200 is directed in the direction from the second area to the first area (that is, the arrow 205 direction). The vibrations are transmitted in the direction of arrow 205. Connector connection reliability is strong when the vibration direction and insertion direction are parallel, and weak when the vibration direction and insertion direction are perpendicular. Since the insertion direction of the connector is substantially parallel to the vibration direction, connection reliability of the connector can be ensured.

FIG. 5 is a detailed internal view of the connector 116 and the wiring-side connector 210 according to another embodiment. In the embodiments shown in FIGS. 1 to 4, the electric system built-in wheel 100 has been described in which the inverter 105 is disposed inside the wheel section 101. However, the inverter 105 is disposed outside the wheel section 101, and the motor 104 is It may be placed in the section 101 in some cases.

The wiring side connector 210 according to another embodiment used at that time includes a U-phase AC pin 201U, a V-phase AC pin 201V, a W-phase AC pin 201W, which transmit three-phase AC current, and temperature information of the motor 104, etc. It has a signal pin 201T for transmitting. Even if the number of pins increases and the width of the connector increases, vibration resistance can be improved by arranging the connector in the position shown in FIG. 3.

FIG. 6 is an overall perspective view of a wheel 100 with a built-in electric system according to another embodiment.

In this embodiment, a power connector 130 and a signal connector 131 connected to the wheel fixing portion 101b are configured separately. The power wiring side connector 230 is connected to the power connector 130 and the power wiring 211. The signal wiring side connector 231 is connected to the signal connector 131 and the signal wiring 212. These power wiring side connector 230 and signal wiring side connector 231 are constructed separately.

The principle of the invention according to this embodiment will be explained. The power wiring 211 is susceptible to electromagnetic noise. Electromagnetic noise may propagate from the power wiring side connector 230 to the signal wiring side connector 231, reducing control reliability and comfort. Therefore, as in this embodiment, the power wiring side connector 230 and the signal wiring side connector 231 are configured as separate bodies, or the power wiring side connector 230 and the signal connector 131 are configured as separate bodies. This makes it possible to simultaneously improve vibration resistance and suppress noise.

Note that as shown in FIG. 6, the power wiring 211 and the signal wiring 212 may be provided so as to be supported by the shock absorber 203 to improve vibration resistance.

Further, the power wiring 211 may be provided so as to be supported by the shock absorber 203, and the signal wiring 212 may be provided so as to be supported by the lower arm 202. Thereby, it is possible to achieve both improvement in vibration resistance and suppression of noise propagation between the power wiring 211 and the signal wiring 212.

DESCRIPTION OF SYMBOLS 100... Wheel with built-in electric system, 101... Wheel part, 101a... Wheel rotating part, 101b... Wheel fixing part, 102... Tire, 103... Shaft, 104... Motor, 105... Inverter, 106... Connector, 106a... Internal connection part , 106b...External connection part, 116...Connector, 130...Power connector, 131...Signal connector, 200...Wiring side connector, 201...Power wiring, 201P...Positive side pin, 201N...Negative side pin, 201S...Control pin , 202...Lower arm, 203...Shock absorber, 204...Spring, 205...Arrow indicating the insertion direction of the wiring side connector 200, 210...Wiring side connector, 211...Power wiring, 212...Signal wiring, 230...Power wiring side connector, 231... Signal wiring side connector, 301... First direction, 302... Second direction, 401... First line segment, 402... Second line segment, 403... Vibration propagation, 404... Obstacle

Claims (6)

A wheel connected to the tire of a moving object,
A motor provided within the wheel,
the wheel has a connector that supplies power to the motor;
A first direction is the direction from the front side to the rear side of the moving body, a first line segment is a line segment passing through the rotation center position of the rotating part of the wheel and parallel to the first direction, and a first line segment is the rotation center position. A line segment that passes through and is perpendicular to the first line segment is defined as a second line segment,
The connector is arranged in a first region on the top side of the first line segment and on the rear side of the second line segment ,
The connector includes a wheel side connector connected to the wheel side and a wiring side connector connected to wiring connected to the vehicle body,
A second region is defined as the ground side of the first line segment and the front side of the second line segment,
The connector is a wheel built-in electric system configured such that the wiring side connector is inserted from the second region toward the first region . The wheel built-in electric system according to claim 1,
an inverter that controls the motor and is provided within the wheel;
The connector supplies electric power transmitted to the motor via the inverter. The wheel built-in electric system according to claim 2,
The connector is connected to a signal line that transmits a signal for controlling the inverter in a wheel built-in electric system. The wheel built-in electric system according to claim 3,
The connector includes a power connector that supplies the power, and a signal connector that transmits a signal for controlling the inverter and is configured separately from the power connector. The wheel built-in electric system according to any one of claims 1 to 4,
The connector is a wheel built-in electric system connected to wiring provided on a lower arm connected to the wheel on the ground side of the first line segment. The wheel built-in electric system according to any one of claims 1 to 4,
In the wheel built-in electric system, the connector is connected to wiring provided on a shock absorber connected to the wheel on the upper side than the first line segment.

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