JP3571302B2 - Wiring structure of suspension part - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-wheel drive electric vehicle in which a drive motor is incorporated in a wheel, and a structure in which a power cable is wired from the vehicle body to the in-wheel motor. The present invention relates to a wiring structure of a suspension portion that can prevent metal fatigue and, as a result, breakage or the like.
[0002]
As shown in FIG. 7, an electric vehicle is a vehicle that can run using only the driving force of the electric motor 101, and uses a secondary battery (battery) as a power source to supply the electric motor 101 in a narrow sense. The vehicle using the electric vehicle A and the engine generator is referred to as a series hybrid vehicle B, and the vehicle using the fuel cell is referred to as a fuel cell vehicle C. In FIG. 7, 102 is a wheel, 103 is a controller, 104 is a secondary battery, 201 is an engine, 202 is a generator, 301 is a hydrogen supply source, and 302 is a fuel cell.
[0003]
Thus, an electric vehicle is a vehicle that can travel using only the driving force of a rotary electric motor, and uses a secondary battery, a fuel cell, and an internal combustion engine as a power source to supply to the electric motor. It is defined as a vehicle using a generator, a solar cell, etc., and a combination thereof. However, in the following description, an electric vehicle using only a secondary battery is considered, but a vehicle using a fuel cell, an internal combustion engine generator, or a solar battery as a power source is naturally included.
[0004]
[Prior art]
An in-wheel drive system in which an electric motor is inserted into wheels has been proposed by the present inventor as one of the driving systems for electric vehicles. The in-wheel drive system has the characteristics that the efficiency of energy transmission from the motor to the wheels is improved, the weight of the entire drive system is reduced, and the effective use space in the vehicle interior is expanded. In this drive system system, two or three power lines are connected to supply electric power from the vehicle body. However, since this drive system is connected to the vehicle body through the suspension, the power lines are connected by vibration of the vehicle. Breaks. In order to suppress the influence of this vibration, it was necessary to make the power line long enough so that the vibration does not substantially affect it.
[0005]
Conventionally, as a similar technique, there is an example in which a wiring technique is applied to a three-link type suspension (also referred to as a trailing link type) among four-wheeled vehicle rear suspensions.
[0006]
8 is a rear view of a vehicle body showing a conventional automobile suspension structure, and FIG. 9 is a side view of the vehicle body showing a conventional automobile suspension structure.
[0007]
In this three-link type suspension, as shown in FIGS. 8 and 9, the axle shaft 602 is supported on the body frame 603 by the trailing arm 600 and the lateral rod 601, and the axle shaft 602 is supported by the coil spring 604 and the shock absorber 605. It is suspended. A wiring harness connected to a wheel speed sensor detection unit provided on a brake device or an axle housing is wired to a trailing arm 600 used in the three-link type suspension.
[0008]
FIG. 10 shows a wiring structure of a conventional suspension unit. A steel pipe 608 is fixed to a side surface 606 of a trailing arm 600 by a bracket 607, and a wire speed sensor from a vehicle body A through a wire harness 609 in the steel pipe 608. The detection section B is wired. In addition, 610 is a bush with an outer cylinder attached to the bracket on the vehicle body frame side, and 611 is a bush with an outer cylinder attached to the bracket on the axle shaft side.
[0009]
In the case of the conventional suspension structure as described above, a stepping stone or the like jumped up by the front wheels jumps on the trailing arm 600 portion of the rear wheel during running, and the stepping stone hits the steel pipe 608 or the wire harness 609, and the steel pipe 608 or the wire harness. 609 could be damaged.
[0010]
In order to solve this drawback, in a wiring structure of a suspension portion for wiring along a trailing arm member provided between a vehicle body frame and an axle shaft, a recess is formed on an upper surface of the trailing arm member along a longitudinal direction. Is formed, and wiring is performed along the concave portion. Further, there is a configuration in which the cross-sectional shape of the concave portion is gradually reduced according to the inclination direction of the trailing arm member on the descending side.
[0011]
FIG. 11 is a conceptual perspective view showing a wiring structure of a suspension portion of a conventional improved example, and FIG. 12 is a sectional view taken along a line B in FIG.
[0012]
In these figures, reference numeral 701 denotes a trailing arm member constituting a suspension of an automobile. The trailing arm member 701 has an outer cylinder attached to a bracket 703 on the vehicle body frame side on both sides of a long trailing arm member main body 702. A bush 704 and a bush 706 with an outer cylinder attached to a bracket 705 on the axle shaft side are provided. The trailing arm member main body 702 is formed by pressing a single long plate member into a hat shape by press molding, and has a concave portion 708 formed along the upper surface longitudinal direction of the trailing arm member main body 702. The recess 708 is formed such that its cross-sectional shape gradually becomes shallower in the inclination direction of the trailing arm member main body 702 on the descending side, and finally the recess 708 is flush with the upper surface near the bush 706 with the outer cylinder. Have been.
[0013]
Further, reference numeral 709 denotes a wire harness connected to a wheel speed sensor detection unit provided on the brake device or the axle housing. The wire harness 709 is wired in the recess 708 of the trailing arm member main body 702, and The clamps 710 and 711 fixed to both ends of the arm member main body 702 by welding are fixed on the wire harness 709 by bending them. A clamp 712 attaches the wire harness 709 to the upper surface of the bracket 703.
[0014]
With such a configuration, even if the stepping stone due to the front wheel splashing hits the trailing arm member main body 702, it does not hit the wire harness 709, so that the stepping stone does not damage the wire harness 709.
[0015]
Further, since the cross-sectional shape of the concave portion 708 is formed to be gradually shallower in accordance with the inclination direction of the trailing arm member main body 702 on the descending side, even when rainwater or the like enters the concave portion 708, the cross-sectional shape is along the slope of the concave portion 708. It is discharged outside.
[0016]
[Problems to be solved by the invention]
However, the above-mentioned improved example is a thin line about the same as a wire harness in which the object is connected to the sensor, and a power line of an electric vehicle, that is, a thick line having a large cross-sectional shape, which is heavy, has a large current capacity, and is flexible. It is not intended for scarce wires.
[0017]
The present invention has been made in view of the above circumstances, and has as its object to provide a wiring structure of a suspension unit that can protect a power line from flying stones and the like and can prevent a decrease in cross-sectional strength of a trailing arm.
[0018]
[Means for Solving the Problems]
The present invention, in order to achieve the above object,
[1] In the wiring structure of the suspension part, the trailing arm member or the lateral rod of the suspension part is insulated except for the power line connection part, and the trailing arm member or the lateral rod is used as a power supply path.
[0019]
[2] In the wiring structure of the suspension part, each arm of the double wishbone having the upper arm and the lower arm and the rod of the link mechanism are formed as an electric conductor, and are connected to the joint body via the bush of the electric insulator. And the rod of each arm is used as a power supply path.
[0020]
[3] In the wiring structure of the suspension section according to the above [2], the bush of the electrical insulator is screwed coaxially between each of the arms, the rod and the joint body.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
FIG. 1 is a conceptual perspective view showing a wiring structure (a trailing arm member formed by press molding) of a suspension portion showing a reference example, and FIG. 2 is a cross-sectional view taken along line A of FIG. 1 (cross section of a trailing arm member main body formed by press molding). .
[0023]
In these figures, reference numeral 1 denotes a trailing arm member constituting a suspension of an automobile. The trailing arm member 1 has an outer cylinder attached to a bracket 3 on a vehicle body frame side on both sides of a long trailing arm member main body 2. A bush 4 and a bush 6 with an outer cylinder attached to the bracket 5 on the motor side are provided.
[0024]
In particular, according to the reference example , the trailing arm member main body 2 is formed by pressing one long plate member into a U-shape by press molding, and the U-shaped along the longitudinal direction of the trailing arm member main body 2. A part 8 is formed. The U-shaped portion 8 is provided with a drain hole 7 on the bottom surface. The U-shaped portion 8 houses a plurality of power lines 9 connected to the in-wheel motor. The power line 9 is movably pressed by resin staples 11-1 to 11-3 inside the U-shaped portion 8 of the trailing arm member main body 2 and wired. Reference numeral 10 denotes a resin clamp for attaching the power line 9 to the upper surface of the bracket 3 so as to fix the power line 9 at a position where bending is not most likely to occur.
[0025]
The reason why the trailing arm member main body 2 has a substantially U-shaped cross section is that
(1) The cross-sectional shape of the power line itself requires a considerable area, and a large space is required to receive it.
[0026]
(2) Since the power line is heavy, it is greatly affected by the vibration of the vehicle. However, if the storage space is large, frictional damage due to the vibration is reduced.
[0027]
(3) Since the power line is not fixed so that a bending force acts thereon but is elastically supported by a resin stapler, the bending and breaking can be suppressed. In addition, since the power line is supported by the bracket made of resin having elasticity, the wiring can be performed while suppressing bending and breaking.
[0028]
For reasons such as.
[0029]
Next, a case where the power line 9 is wired will be described.
[0030]
First, the power line 9 is wired along the inside of the U-shaped portion 8 of the trailing arm member main body 2. The staples 11-1 and 11-3 hold the power line 9 so that no excessive force is applied to the dents (or through holes) 2A of the trailing arm member main body 2 in a state where the staples 11-1 and 11-11 are held. The staples 11-1, 11-2, and 11-3 are locked to the trailing arm member main body 2 by fitting the protruding locking portions 11-A of the two and 11-3. Thereby, when the number of the power lines 9 is two or three, the power lines 9 can be collectively supported.
[0031]
Further, as a second embodiment, a lateral rod (not shown) may be similarly formed in a U-shape to form a U-shaped portion, and a power line may be attached to the U-shaped portion.
[0032]
In the third embodiment, the trailing arm member main body 2 itself is formed of a conductive material by performing an insulating process except for a portion to which a power line is connected, and an insulating film is formed to cover portions other than a necessary electrical connection portion in principle. You can also.
[0033]
As a result, even if the stepping stone due to the front wheel jumping hits the trailing arm member main body 2, it does not hit the power line 9, so that the stepping stone does not damage the power line 9. Further, since the drainage hole 7 is formed on the bottom surface of the U-shaped portion 8, even when rainwater or the like enters the inside of the U-shaped portion 8, it is discharged from the drainage hole 7. Further, when the trailing arm member main body 2 also serves as a conductive path, the power line 9 can be omitted and breakage due to vibration of the power line 9 can be prevented.
[0034]
Next, an embodiment of a reference example of an in-wheel type motor connected to a power line will be described with reference to FIG.
[0035]
FIG. 3 is a conceptual diagram showing a drive system of the electric vehicle of the reference example .
[0036]
The drive mechanism 150 for an electric vehicle is an integrated unit mechanism combining the motor 200, the reduction gear mechanism 300, and the brake 400, and has tires 500 mounted thereon. Motor 200 is a permanent magnet type AC motor. The casing 210 of the motor 200 includes an outer frame 211, an inner frame 212, an end ring 213, and an end plate 214.
[0037]
The outer frame 211 is cylindrical and has a bracket portion 211a on the right side in the figure. The inner frame 212 is a cylindrical member arranged concentrically inside the outer frame 211 and has a bracket 212a on the right side in the drawing. The outer frame 211 and the inner frame 212 are connected by bolting the bracket portion 211a and the bracket portion 212a. An end ring 213 is bolted to the left end surface of the outer frame 211, and an end plate 214 is bolted to the end ring 213. A stator 220 formed by a stator core 221 and a coil 222 is attached to the inner peripheral surface of the outer frame 211. A cylindrical rotor 240 is rotatably mounted on the outer peripheral surface of the inner frame 212 via a motor bearing 230.
[0038]
The rotor 240 is formed by a rotor core 241 and a permanent magnet 242. A rotation block 250 is bolted to the rotor core 241, a rotation speed detector 260 is attached to the left end of the rotation block 250, and a shaft 270 is serrated and connected to a right portion of the rotation block 250. An alternating current is supplied to the coil 222 of the motor 200 through the cable 280, and the rotation speed signal detected by the rotation speed detector 260 is output via the cable 263.
[0039]
The support rings 290 and 291 formed on the outer frame 211 are connected to the fulcrum of the suspension, and the drive mechanism 150 is mounted on the chassis of the electric vehicle.
[0040]
The reduction gear mechanism 300 is constituted by a planetary gear mechanism, and reduces the rotation of the shaft 270 and transmits the rotation to the wheel shaft 410. In this case, the carrier 310 of the reduction gear mechanism 300 is serrated and coupled to the wheel shaft 410 so as to transmit the rotational force while allowing the wheel shaft 410 to move in the axial direction. Further, the outer diameter of the reduction gear wheel mechanism 300 is larger than the inner diameter of the rotor 240.
[0041]
The wheel shaft tube 411 through which the wheel shaft 410 passes is fixed to the bracket portions 211a and 212a. Then, the reduction gear mechanism 300 is arranged in an empty space at a connection portion between the motor 200 and the brake 400, specifically, in a space surrounded by the bracket portion 212a of the inner frame 212 and the wheel shaft tube 411. Further, an end surface of the shaft 270 and an end surface of the wheel shaft 410 are pivotally supported by a pivot 412.
[0042]
The brake 400 is a hydraulic brake using a drum. That is, a wheel hub 420 is bolted to the wheel shaft 410, and a brake drum 430 is bolted to the wheel hub 420. A hub bearing 440 is interposed between the wheel axle tube 411 and the wheel hub 420. In the brake 400, when the brake pedal is depressed and the hydraulic pressure rises, the brake shoe 402 is pushed out by the action of the wheel cylinder 401 and comes into contact with the brake drum 430, so that the brake operates.
[0043]
The tire 500 is mounted on a rim 510 of the disk wheel 505. The rim 510 is connected to the brake drum 430 via the wheel disk of the disk wheel 505.
[0044]
In the above-described drive mechanism 150, when the motor 200 is driven to rotate the rotor 240, the rotation is transmitted to the rotation block 250 and the shaft 270, reduced by the reduction gear mechanism 300, and transmitted to the wheel shaft 410. Therefore, the tire 500 and the brake drum 430 connected to the wheel shaft 410 rotate, and thereby the electric vehicle runs.
[0045]
Further, the reduction gear mechanism 300 includes a sun gear attached to the motor 200, a planetary gear meshing with the sun gear, a next-stage planetary gear coaxial with the planetary gear, and meshing with the next-stage planetary gear. Ring gear.
[0046]
The power line 9 shown in FIGS. 1 and 2 is temporarily connected to a vehicle body frame from a battery via a power control device provided for each wheel, and then is connected to a U-shaped member provided on the trailing arm member main body 2 or the lateral rod. It is movably supported along the section 8 and is connected as a cable 280 to a cable terminal of the motor 200.
[0047]
When the power line 9 is not used, the trailing arm member main body 2 or the lateral rod is insulated except for the connecting portion, and the output of the power control device is connected to one end of the trailing arm member main body 2 or one end of the lateral rod by a cable. , Cable from the other end to the terminal of the motor.
[0048]
Figure 4 is a schematic view of a suspension mechanism consisting of a double wishbone showing the actual施例of the present invention.
[0049]
In FIG. 4, 111 is a chassis (BBF), 112, 112 ', 113, 113' are hollow frames, 114 and 114 'are front rear wheels, 115 and 115' are front front wheels, and 120 and 120 'are suspensions. (Double wishbone), 121, 121 'are first subframes, 122, 122' are second subframes, 123, 123 'are cushioning members, 125, 125' are lower arms, 126, 126 'are uppers The arms, 106, 106 ', 107, 107' are both fluid pneumatic cylinders, 116, 116 'are pipes, and 117, 117' are reservoirs.
[0050]
Figure 5 is a schematic diagram, FIG. 6 is a fragmentary schematic diagram of the wiring structure of the suspension portion of the wiring structure of the suspension unit consisting of a double wishbone showing the actual施例of the present invention.
[0051]
As shown in FIG. 5, in the wiring structure of the suspension section, the double wishbone is composed of an upper arm 520 and a lower arm 530, and the upper arm 520 is composed of a first joint mechanism 521 and an electric conductor. It includes a first arm 522, a common joint mechanism 523, a second joint mechanism 521 ', and a pair of arms including a second arm 522' made of an electric conductor and a common joint mechanism 523.
[0052]
On the other hand, the lower arm 530 includes a first joint mechanism 531, a first arm 532 and a common joint mechanism 533 made of an electric conductor, a second joint mechanism 531 ′, and a second joint mechanism 531 ′ made of an electric conductor. Are provided with a pair of arms 532 ′ and a common joint mechanism 533. 524, 524 ', 534, 534' are lead wires welded to the rod.
[0053]
As shown in FIG. 6B, the wiring structure of the double wishbone is such that a male screw 522A is provided on the outer peripheral portion of the distal end of a cylindrical arm 522, and the male screw 522A is provided with a cylindrical bush made of an electrical insulator. 525 is screwed with a female screw 525A formed on the inner peripheral portion. A male screw 525B formed on the outer peripheral portion of the cylindrical bush 525 is screwed with a female screw 526A formed on the inner peripheral portion at the distal end of the joint portion 526. Are screwed together.
[0054]
As shown in FIG. 6A, the cylindrical arm 522 is an electric conductor, is connected to the joint 526 via a cylindrical bush 525 of an electric insulator, and the first and second arms of each of the arms. The arms 522 and 522 'can be used as a power supply path, and the distal end of the first arm 522 can be connected to each electric device (not shown) via a lead wire 524 to be welded.
[0055]
With this configuration, the arm of the double wishbone can be used as a wiring (conductive path), and the bush 525 of the electrical insulator is coaxially screwed between each arm and the joint body. As a result, electrical insulation can be ensured, and the arm and the joint can be connected without deteriorating the mechanical strength.
[0056]
It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
[0057]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
[0058]
(A) Even if the stepping stone caused by the splashing of the front wheel hits the trailing arm member main body, it does not hit the power line, so that the power line is not damaged by the stepping stone.
[0059]
( B ) When the trailing arm member main body also serves as a conductive path, the power line can be omitted and breakage due to vibration of the power line can be prevented.
[0060]
( C ) The arm of the double wishbone can be used as a wiring (conductive path).
[0061]
( D ) Since the bush of the electrical insulator is coaxially screwed between the rod of each arm and the joint body, electrical insulation is ensured, and the mechanical strength of the rod and the joint is deteriorated. It can be connected without making it.
[Brief description of the drawings]
FIG. 1 is a conceptual perspective view showing a wiring structure of a suspension unit according to a reference example of the present invention.
FIG. 2 is a sectional view taken along line A of FIG.
FIG. 3 is a conceptual diagram showing a drive system of an electric vehicle of a reference example .
It is a schematic view of a suspension mechanism consisting of a double wishbone showing the actual施例of the present invention; FIG.
5 is a schematic view showing the wiring structure of the suspension portion indicating the actual施例of the present invention.
6 is a main part configuration diagram of the wiring structure of the suspension portion indicating the actual施例of the present invention.
FIG. 7 is a diagram showing a basic configuration of an electric powered vehicle.
FIG. 8 is a rear view of a vehicle body showing a conventional automobile suspension structure.
FIG. 9 is a side view of a vehicle body showing a conventional automobile suspension structure.
FIG. 10 is a diagram showing a wiring structure of a conventional suspension unit.
FIG. 11 is a conceptual perspective view showing a wiring structure of a suspension section of a conventional improved example.
FIG. 12 is a sectional view taken along line B in FIG. 11;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Trailing arm member 2 Trailing arm member main body 2A Depressed part (or through hole) of trailing arm member main body
3, 5 Bracket 4, 6 Bush with outer cylinder 7 Drain hole 8 U-shaped part 9 Power line (wire harness)
10 Resin clamps 11-1, 11-2, 11-3 Resin staple 11-A Projection locking portions 106, 106 ', 107, 107' Both fluid pneumatic cylinders 111 Chassis (BBF)
112, 112 ', 113, 113' Hollow frame 114, 114 'Front rear wheel 115, 115' Front front wheel 116, 116 'Pipe 117, 117' Reservoir 120, 120 'Suspension (double wishbone)
121, 121 'First sub-frame 122, 122' Second sub-frame 123, 123 'Buffer member 125, 125', 520 Lower arm 126, 126 ', 530 Upper arm 150 Drive mechanism 200 Motor 210 Casing 211 Outer frame 211a, 212a Bracket part 212 Inner frame 213 End ring 214 End plate 220 Stator 221 Stator core 222 Coil 230 Motor bearing 240 Rotor 241 Rotor core 242 Permanent magnet 250 Rotation block 260 Rotation speed detector 263, 280 Cable 270 Shaft 290,291 Support ring 300 Reduction gear mechanism 310 Carrier 400 Brake 401 Wheel cylinder 402 Brake shoe 410 Wheel shaft 411 Wheel shaft tube 412 Pivot 420 Wheel hub 430 Brake drum 440 Hub bearing 500 Tire 505 Disk wheel 510 Rim 521,531 First joint mechanism 521 ', 531' Second joint mechanism 522,532 First arm (cylindrical shape made of electric conductor) Arm)
522 ', 532' Second arm 522A, 525B Male screw 523, 533 Common joint mechanism 524, 524 ', 534, 534' Lead wire 525 Electrically insulating cylindrical bushing 525A, 526A Female screw 526 Joint part

Claims (3)

In the wiring structure of the suspension part, the trailing arm member or the lateral rod of the suspension part is insulated except for the power line connection part, and the trailing arm member or the lateral rod is used as a power supply path. Section wiring structure. In the wiring structure of the suspension portion, each arm of the double wishbone having an upper arm and a lower arm and a rod of the link mechanism are formed as an electric conductor, and connected to the joint body via a bush of an electric insulator, A wiring structure for a suspension section, wherein each of the arms and rods is used as a power supply path. 3. The wiring structure of a suspension unit according to claim 2, wherein the bush of the electrical insulator is coaxially screwed between each of the arms, the rod, and the joint body.

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