JP6747385B2 - High-voltage cable routing structure - Google Patents

Description

The technique disclosed in the present specification relates to a wiring structure on a front lower side of a floor panel of a high voltage cable.

A technique is known in which a protrusion is provided on the lower surface of the floor panel in order to mitigate the impact when the vehicle collides head-on and the suspension member for the front wheels retracts (Patent Document 1). The protrusion is inclined so that the bottom surface thereof becomes lower toward the rear. The retracted suspension member is guided downward along the bottom surface of the protrusion. This alleviates the impact of the retracted suspension member on the floor panel. The suspension member is a member that supports a suspension link and the like. The suspension member is often fixed to a pair of side members extending in the vehicle front-rear direction.

JP, 2005-3619, A

2. Description of the Related Art In recent years, electric vehicles equipped with driving motors have become widespread. The motor and the inverter may be arranged in the front part (front compartment) of the vehicle, and the power supply may be arranged under the seat or in the rear part of the vehicle. In such an arrangement, it may be possible to arrange a high voltage cable for transmitting high voltage power from the power supply to the inverter under the floor panel. In the present specification, a cable that transmits the electric power supplied to the traveling motor is referred to as a high voltage cable. The “high voltage” in the present specification means a DC power of 60 V or higher, or an AC power of an effective value of 30 V or higher. The high-voltage cable is preferably routed on the side of the above-mentioned protrusion. This is because the protrusion prevents the high voltage cable from coming into contact with the unevenness of the road surface. However, the above-mentioned wiring structure of the high voltage cable has been found to have the following disadvantages. When the rear end of the suspension member has an upward protrusion, the suspension member retracts at the time of a collision, and the protrusion interferes with the protrusion. The suspension member is guided by the inclined bottom surface of the protrusion and moves downward. At this time, if the suspension member does not recede straight and shifts toward the high-voltage cable side, the high-voltage cable may be pinched between the protrusion and the floor panel and crushed when the protrusion comes off the protrusion. is there. The present specification provides a technique for protecting a high voltage cable when a suspension member retracts.

The present specification discloses the following high voltage cable routing structure. An upward protrusion is provided on the rear portion of the front wheel suspension member. A projecting portion projecting downward from the floor panel is provided at a position behind the projection. The bottom surface of the protruding portion is inclined so that it becomes lower toward the rear of the vehicle. A high-voltage cable extends in the vehicle front-rear direction on the lateral side of the protrusion in the vehicle width direction. The high voltage cable is covered by a cover on the side of the protrusion. The cover is arranged such that at least a part of the cover crosses the bottom surface at the height of the top surface of the protrusion when viewed from the side of the vehicle. In such a structure, when the protrusion is disengaged from the bottom surface of the protrusion toward the cover when the suspension member is retracted, the protrusion pushes the cover laterally together with the high-voltage cable. As a result, the high voltage cable is prevented from being caught between the floor panel and the protrusion.

Details of the technology disclosed in the present specification and further improvements will be described in the following “Description of Embodiments”.

It is a partial bottom view of a vehicle. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 5 is a schematic view of the vicinity of the protrusion as viewed from the front to the rear (a state where the bolt of the suspension member is in contact with the bottom surface of the protrusion). FIG. 4 is a schematic view of the vicinity of the protrusion as viewed from the front to the rear (a state in which the bolt of the suspension member is removed from the protrusion). It is a schematic diagram of the protrusion part periphery of a reference example (state which the bolt of a suspension member is contacting with the bottom face of a protrusion part). It is a schematic diagram of the protrusion part periphery of a reference example (state in which the bolt of the suspension member was removed from the protrusion part).

The wiring structure 2 of the embodiment will be described with reference to the drawings. FIG. 1 is a partial bottom view of a vehicle 100, showing the vicinity of the boundary between the front compartment and the cabin. The left side of the broken line CL in the drawing is the front compartment, and the right side is the cabin. The front compartment and the cabin are partitioned by a dash panel (not shown), but since the dash panel is curved when viewed from the side of the vehicle, the broken line CL in the bottom view of FIG. 1 indicates the general boundary between the front compartment and the cabin. Note that this is only shown. In addition, in FIG. 1, illustration of some components (for example, front wheels) unnecessary for the description of the wiring structure 2 is omitted.

The meaning of the coordinate system in the figure will be described. The positive direction of the F-axis of the coordinate system indicates the front of the vehicle, and the positive direction of the V-axis indicates the vertical upper direction. The H axis shows the side of the vehicle. The meaning of each axis of coordinates is the same in all figures. FIG. 2 is a sectional view taken along the line II-II of FIG.

Vehicle 100 is an electric vehicle in which a battery (not shown) having an output voltage of 200 V is arranged in the rear part of the vehicle, and a motor for traveling (not shown) is arranged in the front compartment. An inverter (not shown) that converts the DC power of the battery into an AC suitable for driving the motor is also arranged in the front compartment. A high voltage cable 8 for transmitting high voltage power from the battery to the inverter is routed under the floor panel 6. The high-voltage cable 8 is composed of two wires, a positive electrode wire and a negative electrode wire, but since they are covered by the shield tube, they are drawn as one cable in FIGS. 1 and 2. If the high-voltage cable 8 is arranged above the floor panel 6 (that is, in the cabin), the noise will be high because of (1) the noise is large and (2) the assembling property of the high-voltage cable is deteriorated. The voltage cable 8 is routed under the floor panel 6.

A pair of side members 3 extend in the vehicle front-rear direction below the front compartment. An under reinforcement member 5 is connected to the rear end of each side member 3. The pair of under reinforcement members 5 extend below the floor panel 6 in the vehicle front-rear direction. A suspension member 4 that supports suspension-related components of the front wheels (for example, a suspension link) is arranged below the front compartment. The suspension member 4 includes a pair of front arms 41 extending obliquely forward so as to expand in the vehicle width direction, and a pair of rear arms 42 extending obliquely backward so as to expand in the vehicle width direction. The front ends of the pair of front arms 41 are fixed to the pair of side members 3, respectively. The rear ends of the pair of rear arms 42 are fixed to the fixed base 51 with bolts 43. The bolt 43 penetrates the rear arm 42 from the bottom to the top, and the tip thereof projects upward from the rear arm 42 (suspension member 4). The fixed base 51 is welded to the under reinforcement member 5 and the floor panel 6. Note that the fixed base 51 is not shown in FIG.

A protrusion 7 is provided on the lower surface of the floor panel 6 so as to be located behind the bolt 43 that fixes the rear end (rear arm 42) of the suspension member 4 to the vehicle body. The bottom surface front portion 7a of the protruding portion 7 is inclined so that it becomes lower toward the rear. The bottom surface rear portion 7b of the protruding portion 7 is horizontal. The broken line HL in FIG. 2 is a line that extends horizontally, and the inclined bottom surface front portion 7a is positioned so as to be at the same height as the tip of the bolt 43 (the upper crown surface of the upward bolt 43). There is. The protruding portion 7 is provided so as to be located behind each of the two bolts 43.

The role of the protruding portion 7 is as follows. When the vehicle 100 collides head-on, the suspension member 4 may come off the vehicle body and retreat. Behind the bolt 43 projecting upward from the rear end of the suspension member 4, the inclined bottom surface front part 7a of the projecting part 7 is located. The retreating suspension member 4 is guided by the inclined bottom front portion 7a and retreats and moves downward. As a result, the damage given to the floor panel 6 by the retracted suspension member 4 is alleviated. That is, the damage given to the cabin (the space above the floor panel 6) by the suspension member 4 is reduced.

As described above, the high voltage cable 8 extends in the front-rear direction at the lower front portion of the floor panel 6. The high-voltage cable 8 passes through the side of the protrusion 7 (side in the vehicle width direction). The high-voltage cable 8 also passes through the lower middle portion of the floor panel 6, but the structure of the lower middle portion of the floor panel 6 is not mentioned here. The high-voltage cable 8 is covered with a resin cover 9 on the side of the protruding portion 7. As shown in FIG. 2, when viewed from the side of the vehicle (when viewed from the H-axis direction), a part 9a of the cover 9 is arranged so as to cross the bottom front part 7a of the protrusion 7. There is. The cover 9 is arranged so as to cross the bottom surface front portion 7a at the same height (the height of the broken line HL) as the upper end of the bolt 43 (the upper crown surface of the upward bolt 43).

The advantage of the above-described wiring structure 2, that is, the effect of the cover 9 arranged so as to cross the bottom surface front portion 7a of the protruding portion 7 will be described with reference to FIGS. 3 to 6.

As described above, when the vehicle collides head-on and the suspension member 4 retreats, the upper end of the bolt 43 is guided by the inclined bottom front part 7a of the protrusion 7, and the suspension member 4 moves rearward and downward. To do. At this time, the suspension member 4 does not recede straightly, but may shift toward the high voltage cable 8 side.

First, the wiring structure 200 of the reference example will be described with reference to FIGS. 5 and 6. In this wiring structure, the high voltage cable 8 is covered with a resin cover 209 on the side of the protruding portion 7. The cover 209 does not traverse the bottom front portion 7a when viewed from the side of the vehicle. FIG. 5 is a schematic view of the vicinity of the protruding portion 7 when the wiring structure 200 is viewed from the front to the rear. FIG. 5 schematically shows a state in which the suspension member 4 is retracted and the tip end surface of the bolt 43 (the upper crown surface of the upward bolt 43) is in contact with the bottom surface front portion 7 a of the protrusion 7. In FIG. 5 and FIG. 6, “schematically” means that the bottom face front portion 7a is drawn such that its normal direction is parallel to the V axis. Originally, as shown in FIG. 2, the bottom surface front part 7a is inclined so that the rear part is low, and its normal line intersects the V axis. However, in order to facilitate understanding, FIGS. 5 and 6 depict the bottom surface front part 7a so that its normal line is parallel to the V axis. The same applies to FIGS. 3 and 4 to be referred to later. Further, in FIGS. 5 and 6, the floor panel 6, the high-voltage cable 8, and the cover 209 are shown in a cross section that is parallel to the VH plane and that passes through the bolts 43 for easier understanding. As described above, the positive and negative wires of the high-voltage cable 8 are covered with the shield tube, but the shield tube is not shown in FIGS. 5 and 6 (and FIGS. 3 and 4 to be referred to later). Omitted.

In the wiring structure 200 of the reference example, the resin cover 209 that covers the high-voltage cable 8 has the bottom surface 209 a located closer to the floor panel 6 than the bottom front portion 7 a of the protrusion 7. In the wiring structure 200 of the reference example, when the suspension member 4 shifts to the left side in the drawing, the upper end of the bolt 43 comes off the protrusion 7. FIG. 6 shows a state in which the upper end of the bolt 43 is disengaged from the protrusion 7. A white arrow line indicates the moving direction of the suspension member 4. The suspension member 4 moves from the position 4a shown by the phantom line to the position 4b shown by the solid line. The bolt 43 moves from the position of 43a shown by a virtual line to the position of 43b shown by a solid line. As shown in FIG. 6, the bolt 43 disengages from the protrusion 7 and moves toward the high-voltage cable 8 passing through the side of the protrusion 7. In FIG. 6, the upper end of the bolt 43 interferes with the high voltage cable 8. That is, the state of FIG. 6 means that the high voltage cable 8 may be pinched by the floor panel 6 and the bolt 43 and crushed. As described above, the high-voltage cable 8 carries the output power of the battery of 200 V. It is desirable to prevent the high voltage cable 8 from being damaged and exposing the conductor inside.

The advantages of the wiring structure 2 of this embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 and FIG. 4 are schematic views of the periphery of the protruding portion 7 when the wiring structure 2 of the embodiment is viewed from the front to the rear. The meaning of "schematic diagram" is as described above. Similar to FIG. 5, in FIGS. 3 and 4, the floor panel 6, the high voltage cable 8 and the cover 9 are shown in a cross section that is parallel to the VH plane and that passes through the bolt 43. Further, a shield tube for covering the positive electrode line and the negative electrode line of the high voltage cable 8 is also omitted in the drawing.

FIG. 3 shows a state in which the suspension member 4 is retracted and the tip end surface of the bolt 43 (the upper crown surface of the upward bolt 43) is in contact with the bottom surface front portion 7 a of the protrusion 7. FIG. 4 shows a state in which the upper end of the bolt 43 is disengaged from the bottom front portion 7a to the left side (the side of the high voltage cable 8) in the figure. As described above, the part 9a of the cover 9 crosses the bottom surface front part 7a of the protrusion 7 when viewed from the side of the vehicle. That is, the lower end of the cover 9 is lower than the lower end of the protrusion 7 in the cross section cut along the plane parallel to the VH plane.

In the wiring structure 2 of the embodiment, when the upper end of the bolt 43 is disengaged from the bottom surface front portion 7a of the projecting portion 7, the bolt 43 abuts on the portion 9a protruding downward from the bottom surface front portion 7a, and the portion 9a is shown in the drawing. Push it to the left. As a result, as shown in FIG. 4, the high-voltage cable 8 moves to the left side in the drawing together with the cover 9, and is prevented from being pinched between the bolt 43 and the floor panel 6 which are detached from the protrusion 7. The cover 9 is sandwiched between the floor panel 6 and the suspension member 4 and deforms. The internal high-voltage cable 8 moves due to the deformation of the cover 9, and the high-voltage cable 8 is prevented from being strongly pinched between the floor panel 6 and the suspension member 4.

Points to be noted regarding the technique described in the embodiment will be described. The technology disclosed in this specification is suitable for application to hybrid vehicles and fuel cell vehicles in addition to electric vehicles.

In the embodiment, the upper end of the bolt 43 that fixes the side member 4 to the vehicle body corresponds to an example of an upward protrusion provided on the rear portion of the suspension member. The upward protrusion provided on the rear portion of the suspension member is not limited to the bolt 43 and may be a protrusion for other purposes.

Specific examples of the present invention have been described above in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in the present specification or the drawings exert technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Further, the technique illustrated in the present specification or the drawings can simultaneously achieve a plurality of objects, and achieving the one object among them has technical utility.

2: Installation structure 3: Side member 4: Suspension member 5: Under-reinforcement member 6: Floor panel 7: Projection 7a: Bottom front 7b: Bottom rear 8: High voltage cable 9: Cover 41: Front arm 42: Rear arm 43: Bolt 51: Fixed base 100: Vehicle 200: Routing structure (reference example)
209: Cover

Claims (1)

An upward protrusion is provided on the rear part of the front wheel suspension member,
At the position behind the protrusion, a protrusion protruding downward from the floor panel is provided, and the bottom surface of the protrusion is inclined so that it becomes lower toward the rear,
A high-voltage cable extends in the vehicle front-rear direction on the side of the protruding portion in the vehicle width direction,
The high voltage cable is covered with a cover on the side of the protrusion,
A high-voltage cable routing structure, wherein the cover is arranged such that at least a part of the cover crosses the bottom surface at the height of the top surface of the protrusion when viewed from the side of the vehicle.

Images