JP2024128461A - Electric brake cable - Google Patents

Abstract

To provide a cable for an electric brake that is able to prevent a situation in which a current cannot be supplied to an electric brake device.SOLUTION: A cable 3 for an electric brake supplies a three-phase alternating current to an electric motor 201 of an electric brake device 2 that uses the electric motor 201 as a power source. The cable 3 for the electric brake includes: a first wire group 31 including a first U phase wire 311, a first V phase wire 312, and a first W phase wire 313; a second wire group 32 including a second U phase wire 321, a second V phase wire 322, and a second W phase wire 323; a tape member 33 wound around an outer periphery of a twisted body 30 obtained by twisting the first wire group 31 and the second wire group 32; and a sheath 34 covering an outer periphery of the tape member 34. Both the first wire group 31 and the second wire group 32 are redundantly connected to the electric motor 201.SELECTED DRAWING: Figure 3

Description

The present invention relates to a cable for electric vehicle brakes.

In recent years, electric brake devices using an electric motor as a power source, as described in Patent Documents 1 and 2, for example, have been widely used in place of hydraulic brake devices. Such electric brake devices are being considered for use in electric vehicles and so-called hybrid vehicles, in particular, because they do not require negative pressure generated by an engine or an electric vacuum pump. In the devices described in Patent Documents 1 and 2, a three-phase motor that is supplied with three-phase AC current generated by an inverter is used as the electric motor.

International Publication No. 2019/187805 JP 2017-1559 A

Three-phase AC current is supplied to the electric brake device as described above through a cable that is stretched between the vehicle body. If this cable is damaged, for example by a flying stone or by bending fatigue caused by long-term use, the braking force of the wheels braked by the electric brake device to which the cable is connected may become insufficient, so there is a need to improve reliability.

The present invention was made in consideration of the above circumstances, and its purpose is to provide an electric brake cable that can prevent the occurrence of a situation in which it becomes impossible to supply current to an electric brake device.

The present invention aims to solve the above problems and provides an electric brake cable that supplies three-phase AC current to an electric motor of an electric brake device that uses an electric motor as a power source, the electric brake cable comprising: a first wire group including a first U-phase wire, a first V-phase wire, and a first W-phase wire; a second wire group including a second U-phase wire, a second V-phase wire, and a second W-phase wire; a tape member wound around the outer periphery of a twisted body obtained by twisting together the first wire group and the second wire group; and a sheath that covers the outer periphery of the tape member, in which both the first wire group and the second wire group are redundantly connected to the electric motor.

The electric brake cable of the present invention makes it possible to prevent the occurrence of a situation in which it becomes impossible to supply current to the electric brake device.

1A is an external view showing a vehicle having an electric brake system according to a first embodiment of the present invention, and FIG. 1B is a configuration diagram showing the periphery of one of a plurality of wheels of the vehicle. 1 is a schematic diagram showing an example of the configuration of an electric brake device, an inverter circuit, and a switching circuit of an electric brake system. 1A is a side view showing the configuration of a power line cable, and FIG. 1B is a cross-sectional view of the power line cable taken along line AA in FIG. FIG. 11 is a cross-sectional view of a power line cable according to a second embodiment. FIG. 11 is a cross-sectional view of an electric brake cable according to a third embodiment.

[First embodiment]
Fig. 1(a) is an external view showing a vehicle 1 having an electric brake system 2 according to a first embodiment of the present invention. Fig. 1(b) is a configuration diagram showing the periphery of one of a plurality of wheels 10 of the vehicle 1. The electric brake system 2 is configured to include an electric brake device 20, an inverter circuit 21, a power line switching circuit 22, a signal line switching circuit 23, a control device 24 that controls the inverter circuit 21, the power line switching circuit 22, and the signal line switching circuit 23, a power line cable 3 that supplies three-phase AC current to the electric brake device 20, and a pair of signal line cables 41, 42 that transmit signals between the electric brake device 20 and the control device 24. The power line cable 3 is one aspect of an electric brake cable of the present invention.

The electric brake device 20 is supported by the suspension device 12 together with the knuckle 13 and the hub unit 14 so as to be movable up and down relative to the vehicle body 11. The hub unit 14 has an outer ring 141 fixed to the knuckle 13 by a number of bolts 140, and a hub wheel 142 supported rotatably relative to the outer ring 141. A wheel mounting flange 142a is provided on the hub wheel 142, and the wheel 10 and the brake rotor 15 are attached to the wheel mounting flange 142a by a number of hub bolts 143. The electric brake device 20 presses the brake pads 200 against the brake rotor 15 to generate frictional force and brake the wheel 10.

The vehicle 1 is equipped with a DC power supply 100 that outputs a DC voltage to an inverter circuit 21, and the inverter circuit 21 generates a three-phase AC current by switching the DC voltage output from the DC power supply 100. The generated three-phase AC current is supplied to the electric brake device 20 via a power line cable 3.

FIG. 2 is a schematic diagram showing an example of the configuration of the electric brake device 20, inverter circuit 21, power line switching circuit 22, and signal line switching circuit 23 of the electric brake system 2. The electric brake device 20 has an electric motor 201 as a power source. The electric motor 201 is a three-phase AC motor having a U-phase winding, a V-phase winding, and a W-phase winding on the stator. In this embodiment, the electric brake system 2 has one inverter circuit 21 and one electric motor 201 corresponding to one wheel 10. The electric brake device 20 also has a motion conversion mechanism 202 that converts the rotation of the electric motor 201 into linear motion of the brake pad 200. The motion conversion mechanism 202 is configured, for example, by a ball screw mechanism or a rack and pinion mechanism.

The electric brake device 20 also has an angle sensor 203 that detects the rotation angle of the rotor relative to the stator of the electric motor 201, a load sensor 204 that detects the pressing reaction force of the brake rotor 15 acting on the brake pad 200, and a temperature sensor 205 that detects the temperature of the electric motor 201. The control device 24 controls the electric motor 201 based on the detection signals of these sensors.

The inverter circuit 21 has six switching elements 211 connected in a three-phase bridge configuration, and freewheel diodes 212 connected in parallel to each switching element 211. Each switching element 211 is switched between an on state and an off state by a PWM (Pulse Width Modulation) signal from the control device 24. The control device 24 generates a three-phase AC current to be supplied to the electric motor 201 of the electric brake device 20 by PWM control based on the detection signal of the angle sensor 203.

The power line switching circuit 22 is, for example, configured with a triple relay circuit. The control device 24 controls the power line switching circuit 22 to switch whether the three-phase AC current generated by the inverter circuit 21 is supplied to the electric motor 201 via a first group of wires 31 of the power line cable 3 described below, or via a second group of wires 32. Note that in this embodiment, the switching is performed on the inverter side, but it is also possible to switch on the caliper side. It is also possible to have a dual system without switching.

The power cable 3 and the first and second signal cables 41, 42 are strung with a portion of their length slack between the electric brake device 20 and the vehicle body 11 so that they can respond to the vertical movement of the wheels 10 relative to the vehicle body 11 and the twisting caused by steering. The detection signals of the angle sensor 203, the load sensor 204, and the temperature sensor 205 are transmitted to the control device 24 via one of the pair of signal cables 41, 42.

The signal line switching circuit 23 can switch which of the pair of signal line cables 41, 42 is used to transmit the detection signals of the angle sensor 203, the load sensor 204, and the temperature sensor 205 to the control device 24. The signal line switching circuit 23 is configured, for example, by a relay circuit. In this embodiment, the signal line cables 41, 42 are thus made redundant.

For example, when one of the signal line cables 41, 42, the signal line cable 41, is used as a regular system, the other signal line cable 42 is used as a backup system. In this case, the control device 24 controls the signal line switching circuit 23 when an abnormality occurs in one of the signal line cables 41, and the detection signals of the angle sensor 203, the load sensor 204, and the temperature sensor 205 are transmitted to the control device 24 by the other signal line cable 42. Note that the control device 24 detects that an abnormality has occurred in one of the signal line cables 41, for example, when the detection signals of any of the angle sensor 203, the load sensor 204, and the temperature sensor 205 are no longer transmitted normally by the one signal line cable 41.

Figure 3(a) is a side view showing the configuration of the power cable 3. Figure 3(b) is a cross-sectional view of the power cable 3 taken along line A-A in Figure 3(a). The power cable 3 includes a twisted body 30 made of multiple electric wires twisted together, a tape member 33 wrapped around the outer periphery of the twisted body 30, and a sheath 34 covering the outer periphery of the tape member 33. The twisted body 30 is made by twisting together a first group of electric wires 31 and a second group of electric wires 32, and an intermediate 300 made of a fibrous material such as staple fiber or Kevlar (registered trademark) is disposed in the center of the twisted body 30. The tape member 33 may be, for example, a strip-shaped member made of nonwoven fabric, paper, or resin. The sheath 34 is, for example, made of urethane resin.

The first electric wire group 31 and the second electric wire group 32 are both redundantly connected to the electric motor 201. The first electric wire group 31 includes a first U-phase electric wire 311, a first V-phase electric wire 312, and a first W-phase electric wire 313. The second electric wire group 32 includes a second U-phase electric wire 321, a second V-phase electric wire 322, and a second W-phase electric wire 323. The first U-phase electric wire 311, the first V-phase electric wire 312, the first W-phase electric wire 313, the second U-phase electric wire 321, the second V-phase electric wire 322, and the second W-phase electric wire 323 are arranged side by side in the cable circumferential direction around the central axis _C1 of the power supply cable 3.

The first U-phase wire 311, the first V-phase wire 312, the first W-phase wire 313, the second U-phase wire 321, the second V-phase wire 322, and the second W-phase wire 323 each have a conductor 301 and an insulator 302 that covers the conductor 301. The conductor 301 is, for example, a twisted wire formed by twisting together a plurality of metal wires. As this metal wire, for example, a tin-plated copper wire, a tin-plated copper alloy wire, a silver-plated copper wire, or a silver-plated copper alloy wire can be suitably used. The insulator 302 is made of an insulating resin material such as fluororesin. The first U-phase wire 311, the first V-phase wire 312, the first W-phase wire 313, the second U-phase wire 321, the second V-phase wire 322, and the second W-phase wire 323 have the same conductor cross-sectional area, outer diameter, etc. In addition, each of these electric wires can be distinguished during terminal processing because the insulator 302 has a different color.

In this embodiment, the first U-phase wire 311, the first V-phase wire 312, and the first W-phase wire 313 are adjacent to each other in the cable circumferential direction, and the second U-phase wire 321, the second V-phase wire 322, and the second W-phase wire 323 are adjacent to each other in the cable circumferential direction. More specifically, the first U-phase wire 311, the first V-phase wire 312, the first W-phase wire 313, the second U-phase wire 321, the second V-phase wire 322, and the second W-phase wire 323 are lined up in this order in the cable circumferential direction.

The switching circuit 22 can switch between supplying current to the electric motor 201 through the first group of electric wires 31 and supplying current to the electric motor 201 through the second group of electric wires 32. In this embodiment, the first group of electric wires 31 is used as a regular system and the second group of electric wires 32 is used as a standby system, and when an abnormality occurs in the first group of electric wires 31 of the regular system, the system is switched to the second group of electric wires 32 of the standby system to supply three-phase AC current to the electric motor 201. Note that the opposite may also be true, with the first group of electric wires 31 used as the standby system and the second group of electric wires 32 used as the regular system.

For example, when the magnitude of the current flowing through any of the first U-phase wire 311, the first V-phase wire 312, and the first W-phase wire 313 is smaller than the current value expected according to the duty ratio of the PWM control, the control device 24 determines that an abnormality such as a disconnection has occurred, and controls the switching circuit 22 to switch to a state in which the second group of wires 32, which is the standby system, supplies current to the electric motor 201. When the control device 24 controls the switching circuit 22 to switch to the standby system, it also outputs a signal to notify the driver of the vehicle 1 of the occurrence of the abnormality.

(Effects of the First Embodiment)
According to the first embodiment described above, even if, for example, a break or partial break occurs in any of the first U-phase electric wire 311, the first V-phase electric wire 312, and the first W-phase electric wire 313 of the first electric wire group 31, it is possible to supply current to the electric motor 201 through the second U-phase electric wire 321, the second V-phase electric wire 322, and the second W-phase electric wire 323 of the second electric wire group 32. This makes it possible to suppress the occurrence of a situation in which an appropriate current cannot be supplied to the electric brake device 20.

In addition, according to the first embodiment, the first U-phase wire 311, the first V-phase wire 312, and the first W-phase wire 313 of the first wire group 31 and the second U-phase wire 321, the second V-phase wire 322, and the second W-phase wire 323 of the second wire group 32 are included in one power line cable 3, so that the wiring man-hours can be reduced compared to when each wire of the first wire group 31 and each wire of the second wire group 32 are each formed as a separate cable.

In addition, according to the first embodiment, the first U-phase electric wire 311, the first V-phase electric wire 312, and the first W-phase electric wire 313 are adjacent to each other in the cable circumferential direction, and the second U-phase electric wire 321, the second V-phase electric wire 322, and the second W-phase electric wire 323 are adjacent to each other in the cable circumferential direction. This makes it easy to separate the first electric wire group 31 and the second electric wire group 32 when processing the terminal of the power line cable 3, facilitating terminal processing.

Furthermore, according to the first embodiment, the signal line cables 41, 42 are made redundant. Therefore, even if, for example, one of the signal line cables 41 is broken or partially broken while the other signal line cable 41 is being used as a regular system, the signal line switching circuit 23 is controlled to switch to the backup signal line cable 42, thereby making it possible to prevent the occurrence of a situation in which the electric brake device 20 cannot be properly controlled.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view of a power line cable 3 according to the second embodiment. In this embodiment, as in the first embodiment, a first U-phase electric wire 311, a first V-phase electric wire 312, a first W-phase electric wire 313, a second U-phase electric wire 321, a second V-phase electric wire 322, and a second W-phase electric wire 323 are arranged side by side in the circumferential direction, but the order of the electric wires is different from that in the first embodiment.

In this embodiment, any one of the first U-phase electric wire 311, the first V-phase electric wire 312, and the first W-phase electric wire 313 constituting the first electric wire group 31 and any one of the second U-phase electric wire 321, the second V-phase electric wire 322, and the second W-phase electric wire 323 constituting the second electric wire group 32 are alternately arranged along the cable circumferential direction. More specifically, the first U-phase electric wire 311 is arranged between the second W-phase electric wire 323 and the second U-phase electric wire 321, the first V-phase electric wire 312 is arranged between the second U-phase electric wire 321 and the second V-phase electric wire 322, and the first W-phase electric wire 313 is arranged between the second V-phase electric wire 322 and the second W-phase electric wire 323.

The other configurations of the power line cable 3 and the electric brake system 2 in this embodiment are the same as those in the first embodiment, and a tape member 33 is wound around the outer periphery of a twisted body 30 formed by twisting together a first U-phase electric wire 311, a second U-phase electric wire 321, a first V-phase electric wire 312, a second V-phase electric wire 322, a first W-phase electric wire 313, and a second W-phase electric wire 323, and the outer periphery of the tape member 33 is covered by a sheath 34. In addition, one of the first electric wire group 31 and the second electric wire group 32 is used as a regular system, and the other is used as a standby system.

As with the first embodiment, this embodiment also makes it possible to prevent occurrence of a situation in which an appropriate current cannot be supplied to the electric brake device 20. In addition, when the electric brake device 20 moves up and down together with the wheels 10 relative to the vehicle body 11, it is possible to prevent stress from concentrating on one of the first electric wire group 31 and the second electric wire group 32. Furthermore, since the standby electric wires (e.g., the second U-phase electric wire 321, the second V-phase electric wire 322, and the second W-phase electric wire 323) are interposed between the regular electric wires (e.g., the first U-phase electric wire 311, the first V-phase electric wire 312, and the first W-phase electric wire 313), the distance between the electric wires through which the current flows can be increased, the temperature rise can be suppressed, and a larger current can be passed, or the conductor cross-sectional area and outer diameter of each electric wire can be reduced.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a cross-sectional view of an electric brake cable 5 according to the third embodiment. In the first embodiment, the power supply cable 3 that supplies current to the electric motor 201 and the signal line cables 41, 42 that transmit detection signals from the sensors are separate, but in the third embodiment, the electric wires of the power supply cable 3 and the signal line cables 41, 42 are integrated into a single electric brake cable 5.

The electric brake cable 5 has a first three-phase AC cable 51, a second three-phase AC cable 52, a plurality of signal line cables 53 to 55, and one twisted pair cable 56, and these cables are twisted together to form a twisted body 50. The first three-phase AC cable 51, the second three-phase AC cable 52, and the plurality of signal line cables 53 to 55 are arranged side by side in the cable circumferential direction centered on the central axis _C2 of the electric brake cable 5. The twisted pair cable 56 has a pair of signal lines 561, and is arranged in the valley between the signal line cables 54 and 55.

The electric brake cable 5 also includes a tape member 57 wound around the outer periphery of the twisted body 50, a sheath 58 that covers the outer periphery of the tape member 57, and an interposer 59 arranged around the twisted body 50. The materials of the tape member 57, the sheath 58, and the interposer 59 are the same as those in the first embodiment.

The first three-phase AC cable 51 has a first U-phase electric wire 511, a first V-phase electric wire 512, and a first W-phase electric wire 513 as a first electric wire group 510, and a first shield conductor 514, and the first U-phase electric wire 511, the first V-phase electric wire 512, and the first W-phase electric wire 513 are twisted together and covered by the first shield conductor 514. The second three-phase AC cable 52 has a second U-phase electric wire 521, a second V-phase electric wire 522, and a second W-phase electric wire 523 as a second electric wire group 520, and a second shield conductor 524, and the second U-phase electric wire 521, the second V-phase electric wire 522, and the second W-phase electric wire 523 are twisted together and covered by the second shield conductor 524.

The first U-phase wire 511, the first V-phase wire 512, and the first W-phase wire 513, as well as the second U-phase wire 521, the second V-phase wire 522, and the second W-phase wire 523, have a conductor 501 and an insulator 502 that covers the conductor 501, as in the first embodiment. The conductor 501 is, for example, a twisted wire made by twisting together multiple metal wires, and the insulator 502 is made of an insulating resin material such as fluororesin. The first shield conductor 514 and the second shield conductor 524 are, for example, braided shields made by braiding multiple shield wires in a lattice pattern.

Each of the signal line cables 53 to 55 is constructed by twisting together a number of shielded twisted pair wires 6. In this embodiment, each of the signal line cables 53 to 55 has three shielded twisted pair wires 6. Each of the shielded twisted pair wires 6 has a pair of twisted signal wires 61, 61 and a shield conductor 62 that covers the pair of signal wires 61, 61.

The pair of signal lines 61, 61 each have a signal line conductor 611 and an insulator 612 that covers the signal line conductor 611. The signal line conductor 611 is, for example, a twisted wire made by twisting together multiple metal wires, and the insulator 612 is made of an insulating resin material such as fluororesin. The shield conductor 62 is, for example, a braided shield made by braiding multiple shield wires in a lattice pattern.

Hereinafter, the signal line cables 53 to 55 are referred to as the first signal line cable 53, the second signal line cable 54, and the third signal line cable 55, respectively. As an example, the first signal line cable 53 transmits a detection signal from the load sensor 204. The second signal line cable 54 and the third signal line cable 55 transmit a detection signal from the angle sensor 203. Furthermore, the twisted pair cable 56 transmits a detection signal from the temperature sensor 205.

The first signal line cable 53 includes a total of six signal lines 61, of which half (three signal lines 61) are used as a regular system, and the remaining three signal lines 61 are used as a spare system. The second signal line cable 54 and the third signal line cable 55 include a total of 12 signal lines 61, of which half (six signal lines 61) are used as a regular system, and the remaining six signal lines 61 are used as a spare system. In addition, the twisted pair cable 56 includes a pair of signal lines 561, one of which is used as a regular system, and the other is used as a spare system. As in the first embodiment, these signal lines are switched between the regular system and the spare system by a signal line switching circuit, which is constituted by, for example, a relay circuit.

The first three-phase AC cable 51 and the second three-phase AC cable 52 are not adjacent to each other in the circumferential direction of the cable. In FIG. 5, the first three-phase AC cable 51 and the second three-phase AC cable 52 are shown side by side in the left-right direction of the drawing, with the first signal line cable 53 being arranged on the upper side of the drawing between the first three-phase AC cable 51 and the second three-phase AC cable 52, and the second signal line cable 54 and the third signal line cable 55 being arranged on the lower side of the drawing between the first three-phase AC cable 51 and the second three-phase AC cable 52. In other words, at least one signal line cable of the first to third signal line cables 53 to 55 is interposed between the first three-phase AC cable 51 and the second three-phase AC cable 52.

The first wire group 510 of the first three-phase AC cable 51 and the second wire group 520 of the second three-phase AC cable 52 are both redundantly connected to the electric motor 201 of the electric brake device 20, and as in the first embodiment, one is used as a regular system and the other is used as a backup system, and are switched by a power line switching circuit configured by, for example, a relay circuit. For example, under normal circumstances, three-phase AC current is supplied to the electric motor 201 by the first U-phase wire 511, the first V-phase wire 512, and the first W-phase wire 513 of the first wire group 510, and when an abnormality occurs in the first wire group 510, three-phase AC current is supplied to the electric motor 201 by the second U-phase wire 521, the second V-phase wire 522, and the second W-phase wire 523 of the second wire group 520. This makes it possible to suppress the occurrence of a situation in which an appropriate current cannot be supplied to the electric brake device 20, as in the first embodiment.

In addition, in this embodiment, the first three-phase AC cable 51 is configured by collectively covering the first U-phase electric wire 511, the first V-phase electric wire 512, and the first W-phase electric wire 513 of the first electric wire group 510 with the first shield conductor 514, and the second three-phase AC cable 52 is configured by collectively covering the second U-phase electric wire 521, the second V-phase electric wire 522, and the second W-phase electric wire 523 of the second electric wire group 520 with the second shield conductor 524. This makes it possible to suppress the influence of radiation noise caused by the current supplied to the electric motor 201 on the first to third signal line cables 53 to 55 outside the first shield conductor 514 and the second shield conductor 524, and also makes it easier to separate the first three-phase AC cable 51 and the second three-phase AC cable 52 when processing the terminals of the electric brake cable 5.

In addition, in this embodiment, each pair of signal lines 61 of the first to third signal line cables 53 to 55 is covered with a shield conductor 63, which suppresses crosstalk between the multiple shielded twisted pair wires 6 and also suppresses the effects of radiation noise caused by the current supplied to the electric motor 201.

Furthermore, in this embodiment, the first three-phase AC cable 51 is arranged between the first signal line cable 53 and the second signal line cable 54 in the cable circumferential direction, and the second three-phase AC cable 52 is arranged between the first signal line cable 53 and the third signal line cable 55, so that crosstalk between the first signal line cable 53 and the second signal line cable 54 and the third signal line cable 55 is suppressed.

(Summary of the embodiment)
Next, the technical ideas grasped from the first to third embodiments described above will be described by using the reference numerals and the like in each embodiment. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[1] An electric brake cable (3, 5) for supplying three-phase AC current to an electric motor (201) of an electric brake device (2) using an electric motor (201) as a power source, the electric brake cable (3, 5) comprising a first wire group (31, 510) including a first U-phase wire (311, 511), a first V-phase wire (312, 512), and a first W-phase wire (313, 513), and a second wire group (31, 510) including a second U-phase wire (321, 521), a second V-phase wire (322, 522), and a second W-phase wire (323, 523). An electric brake cable (3, 5) comprising a wire group (32, 520), a tape member (33, 57) wound around the outer circumference of a stranded body (30, 50) formed by stranding the first electric wire group (31, 510) and the second electric wire group (32, 520), and a sheath (34, 58) covering the outer circumference of the tape member (33, 57), in which the first electric wire group (31, 510) and the second electric wire group (32, 520) are both redundantly connected to the electric motor (201).

[2] The electric brake cable (3) described in [1] above, in which the first U-phase electric wire (311), the first V-phase electric wire (312), the first W-phase electric wire (313), the second U-phase electric wire (321), the second V-phase electric wire (322), and the second W-phase electric wire (323) are arranged side by side in the cable circumferential direction, the first U-phase electric wire (311), the first V-phase electric wire (312), and the first W-phase electric wire (313) are adjacent to each other in the cable circumferential direction, and the second U-phase electric wire (321), the second V-phase electric wire (322), and the second W-phase electric wire (323) are adjacent to each other in the cable circumferential direction.

[3] The electric brake cable (3) described in [1] above, in which the first U-phase electric wire (311), the first V-phase electric wire (312), the first W-phase electric wire (313), the second U-phase electric wire (321), the second V-phase electric wire (322), and the second W-phase electric wire (323) are arranged side by side in the cable circumferential direction, and any one of the first U-phase electric wire (311), the first V-phase electric wire (312), and the first W-phase electric wire (313) constituting the first electric wire group (31) and any one of the second U-phase electric wire (321), the second V-phase electric wire (322), and the second W-phase electric wire (323) constituting the second electric wire group (32) are arranged alternately along the cable circumferential direction.

[4] The electric brake cable (5) described in [1] above, which has a first three-phase AC cable (51) in which the first U-phase electric wire (511), the first V-phase electric wire (512), and the first W-phase electric wire (513) are twisted together and covered with a first shield conductor (514), and a second three-phase AC cable (52) in which the second U-phase electric wire (521), the second V-phase electric wire (522), and the second W-phase electric wire (523) are twisted together and covered with a second shield conductor (524).

[5] An electric brake cable (5) as described in [4] above, comprising the first three-phase AC cable (51), the second three-phase AC cable (52), and a plurality of signal lines (61), the plurality of signal lines (61) being made redundant.

[6] The electric brake cable (5) described in [5] above, in which the multiple signal lines (61) are twisted together to form a signal line cable (53-55), and the signal line cable (53-55), the first three-phase AC cable (51), and the second three-phase AC cable (52) are twisted together to form the twisted body (50).

[7] An electric brake cable (5) according to the above [6], in which a plurality of the signal line cables (53-55), the first three-phase AC cable (51), and the second three-phase AC cable (52) are arranged side by side in the cable circumferential direction, and at least one of the signal line cables (53-55) is interposed between the first three-phase AC cable (51) and the second three-phase AC cable (52) in the cable circumferential direction.

Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention.

2... Electric brake system 20... Electric brake device 201... Electric motor 22... Switching circuit 3... Power line cable (cable for electric brake) 30... Twisted body 31... First group of electric wires 311... First U-phase electric wire 312... First V-phase electric wire 313... First W-phase electric wire 32... Second group of electric wires 321... Second U-phase electric wire 322... Second V-phase electric wire 323... Second W-phase electric wire 33... Tape member 34... Sheath 5... Electric brake cable 50... Twisted body 51... First three-phase AC cable 510... First group of electric wires 511... First U-phase electric wire 512... First V-phase electric wire 513... First W-phase electric wire 514... First shield conductor 52... Second three-phase AC cable 520... Second group of electric wires 521... Second U-phase electric wire 522: Second V-phase electric wire 523: Second W-phase electric wire 524: Second shield conductor 53 to 55: Signal line cable 57: Tape member 58: Sheath 61: Signal line

Claims (7)

An electric brake cable for supplying three-phase AC current to an electric motor of an electric brake device using an electric motor as a power source,
a first electric wire group including a first U-phase electric wire, a first V-phase electric wire, and a first W-phase electric wire;
a second wire group including a second U-phase wire, a second V-phase wire, and a second W-phase wire;
a tape member wound around an outer periphery of a stranded body obtained by stranding the first electric wire group and the second electric wire group;
a sheath covering an outer periphery of the tape member;
the first electric wire group and the second electric wire group are both redundantly connected to the electric motor;
Cable for electric brake. the first U-phase electric wire, the first V-phase electric wire, the first W-phase electric wire, the second U-phase electric wire, the second V-phase electric wire, and the second W-phase electric wire are arranged side by side in a circumferential direction of a cable,
the first U-phase electric wire, the first V-phase electric wire, and the first W-phase electric wire are adjacent to one another in a circumferential direction of the cable,
the second U-phase electric wire, the second V-phase electric wire, and the second W-phase electric wire are adjacent to each other in a circumferential direction of the cable.
The electric brake cable according to claim 1 . the first U-phase electric wire, the first V-phase electric wire, the first W-phase electric wire, the second U-phase electric wire, the second V-phase electric wire, and the second W-phase electric wire are arranged side by side in a cable circumferential direction,
any one of the first U-phase electric wire, the first V-phase electric wire, and the first W-phase electric wire constituting the first electric wire group and any one of the second U-phase electric wire, the second V-phase electric wire, and the second W-phase electric wire constituting the second electric wire group are alternately arranged along the cable circumferential direction.
The electric brake cable according to claim 1 . a first three-phase AC cable in which the first U-phase electric wire, the first V-phase electric wire, and the first W-phase electric wire are twisted together and covered with a first shield conductor;
a second three-phase AC cable in which the second U-phase electric wire, the second V-phase electric wire, and the second W-phase electric wire are twisted together and covered with a second shield conductor,
The electric brake cable according to claim 1 . the twisted body includes the first three-phase AC cable, the second three-phase AC cable, and a plurality of signal lines;
The plurality of signal lines are made redundant.
The cable for an electric brake according to claim 4. The plurality of signal lines are twisted together to form a signal line cable;
the signal line cable, the first three-phase AC cable, and the second three-phase AC cable are twisted together to form the twisted body;
The cable for an electric brake according to claim 5. A plurality of the signal line cables, the first three-phase AC cable, and the second three-phase AC cable are arranged side by side in a cable circumferential direction,
At least one of the signal line cables is interposed between the first three-phase AC cable and the second three-phase AC cable in a cable circumferential direction.
The electric brake cable according to claim 6.

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