Electric vehicle wiring structure

Abstract

To provide an electric wire arrangement structure of an electric vehicle which can inhibit an electric wire from being caught between a frame and a dash panel during a frontal collision.SOLUTION: In an electric wire arrangement structure of an electric vehicle, an electric device is mounted on a frame spanning front side members and the electric device and a driving battery, an inverter for driving a driving motor, or a compressor for air conditioning are connected by an electric wire. In a plan view, a vehicle rear end edge of the frame includes: a first portion which is one of contact points of a tangent line which contacts with a contour of the end edge at two points; a second portion which is the other contact point; and a third portion which connects the first portion with the second portion. The first portion is located at one side relative to a center as seen in a vehicle width direction of the frame and the second portion is located at the other side. The third portion is located at the vehicle front side relative to the tangent line. At least part of the electric wire is arranged so as to pass through an area which is sandwiched between the third portion and a dash panel facing the third portion in a frame height.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to a wiring structure for electric vehicles. [Background technology]

[0002] Patent Document 1 discloses a motor unit support structure for supporting a motor unit composed of a motor and a reduction gear. This motor unit support structure includes a pair of side members extending in the vehicle longitudinal direction within a housing chamber in which the motor unit is housed, a subframe extending in the vehicle width direction, a first mounting portion that supports the subframe to the side members via a first elastic body, and a second mounting portion that supports the motor unit on the underside of the subframe via a second elastic body. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-32952 [Overview of the project] [Problems that the invention aims to solve]

[0004] Incidentally, in electric vehicles, a frame is sometimes installed between the front side members in front of the dashboard panel, and electrical equipment is mounted on this frame. When routing the wires connected to the electrical equipment, it is conceivable to route them between the frame and the dashboard panel. In this case, there was a risk that the wires could get caught between the frame and the dashboard panel as they moved backward during a frontal collision.

[0005] The object of the present invention is to provide a wire routing structure for an electric vehicle that can prevent wires from being caught between the frame and the dash panel during a frontal collision. [Means for solving the problem]

[0006] In the wire harness structure according to one aspect of the present invention, an electric device is mounted on a frame installed between front side members, and the electric device is connected to a traveling battery, an inverter for driving a traveling motor, or an air conditioner compressor by an electric wire. The edge portion on the rear side of the vehicle of the frame includes, in a plan view, a first portion that is one contact point of a tangent line that contacts the contour of the edge portion at two points, a second portion that is the other contact point, and a third portion that connects them. The first portion is located on one side of the center in the vehicle width direction of the frame, the second portion is located on the other side, and the third portion is located on the front side of the vehicle with respect to the tangent line. At least a part of the electric wire is routed through a region sandwiched between the third portion and a dash panel facing the third portion at the height of the frame.

Advantages of the Invention

[0007] According to the above wire harness structure, it is possible to suppress the electric wire from being sandwiched between the frame and the dash panel during a frontal collision.

Brief Description of the Drawings

[0008] [Figure 1] It is a side view showing the wire harness structure of an electric vehicle according to an embodiment. [Figure 2] It is a figure which shows typically the cross section along the line II-II of FIG. 1. [Figure 3] It is a partial cross-sectional plan view showing the wire harness structure of an electric vehicle according to an embodiment. [Figure 4] It is a plan view of a frame according to an embodiment. [Figure 5] It is a rear view of a frame according to an embodiment. [Figure 6] It is a figure which shows an example of the backward movement of a frame at the time of a frontal collision.

Modes for Carrying Out the Invention

[0009] The following description will explain the wiring structure S of the electric vehicle according to the embodiment with reference to the drawings. In each figure, FR and RR indicate the front and rear of the vehicle in the longitudinal direction, LH and RH indicate the left and right of the vehicle in the width direction, and UP and DN indicate the upper and lower of the vehicle in the vertical direction, respectively. In the following description, the left and right sides in the width direction, the front and rear in the longitudinal direction, and the upper and lower in the vertical direction will simply be referred to as "left side," "right side," "front," "rear," "upper," and "lower," respectively. Elements having the same function will be denoted by the same reference numeral, and redundant explanations will be omitted.

[0010] The electric vehicle according to this embodiment (hereinafter referred to as Vehicle V) is, for example, an electric vehicle (EV) that runs using only an electric motor as a driving force source. As shown in Figures 1 to 3, a motor room MR is provided at the front of Vehicle V. The rear of the motor room MR is separated from the passenger compartment C by a dash panel 1. Front side members 2 extend forward from the dash panel 1 on both the left and right sides of the motor room MR. L ,2 R A high-voltage (e.g., 350V) battery 3, which is a traction battery, is located behind the dashboard panel 1 and under the passenger compartment floor F.

[0011] Inside the motor room MR, the motor unit U is located. The motor unit U consists of a motor MT, which is a drive motor that generates the driving force to move the vehicle V; an inverter IN, which is an inverter for driving the drive motor; and a reduction gear RD.

[0012] The motor MT is positioned so that its output shaft is parallel to the vehicle width. The inverter IN is located to the right of the motor MT and is integrated with it. The inverter IN has the function of converting DC power from battery 3 into AC power for driving the motor MT while the vehicle V is running, and converting power regenerated by the motor MT into DC power for charging battery 3.

[0013] The reduction gear RD reduces the rotation of the motor MT and provides the driving force necessary for the vehicle V to move through the differential mechanism DF to the left and right front axles A.L , A R is transmitted to. Each front axle A L , A R has left and right front wheels W L , W R connected thereto.

[0014] Also, in the motor unit U, a compressor CM which is an air-conditioning compressor is attached to the left side of the speed reducer RD. The compressor CM is an electric compressor for compressing a refrigerant used for air conditioning in the passenger compartment C during running or stopping.

[0015] As shown in FIGS. 1 to 3, a frame 4 is installed between a pair of front side members 2 L , 2 R in the motor room MR. That is, the frame 4 connects the left and right front side members 2 L , 2 R to each other. The frame 4 is also referred to as a subframe.

[0016] The frame 4 is provided above the motor unit U and suspends and supports the motor unit U. A power delivery module PDM which is an electric device is mounted on the upper surface of the frame 4.

[0017] The power delivery module PDM is, for example, an integrated unit of a junction box JB, a DCDC converter CV, an in-vehicle charger CH, etc. The DCDC converter CV transforms the supplied direct current and outputs the transformed direct current to accessory devices such as a storage battery, a car stereo, a navigation system, etc.

[0018] The in-vehicle charger CH receives supply of an alternating current from a supply facility provided outside the vehicle V and supplies a current for charging the battery 3. The in-vehicle charger CH is also referred to as an OBC (On-Board Charger).

[0019] The junction box JB distributes high-voltage current supplied from, for example, battery 3, to inverter IN, etc. The junction box JB may also function as a circuit breaker to shut off in case of an abnormality.

[0020] As shown in Figures 1 and 3, the power delivery module PDM is connected to wires W, which include power cables and high-voltage harnesses. The first wire W1 is connected to the junction box JB and the battery 3, the second wire W2 is connected to the junction box JB and the inverter IN, and the third wire W3 is connected to the junction box JB and the compressor CM.

[0021] The power delivery module PDM, the first wire W1, the second wire, and the third wire W3 are all so-called high-voltage components that handle high voltage (60V or more), just like the battery 3, and high-voltage current flows through each of the wires W1, W2, and W3 while the vehicle V is running.

[0022] The frame 4 supporting the power delivery module (PDM) from below includes a main body 5 and left and right brackets 6 and 7, as shown in Figures 4 and 5. The main body 5 is positioned in front of the vertical wall 1a (see Figure 1) of the dash panel 1, with its rear end facing the vertical wall 1a in the vehicle's longitudinal direction. The vertical wall 1a has a flat plate shape extending along a direction perpendicular to the vehicle's longitudinal direction.

[0023] The main body 5 is a flat member having a roughly rectangular outer shape in plan view. The main body 5 may have a hollow cross-section to reduce weight and ensure rigidity. The main body 5 suspends and supports the motor unit U via vibration-damping members 8, such as rubber mounts, attached to two locations on the left and right sides.

[0024] The main body 5 is provided with reinforcing beads, called beads B. Bead B includes a first bead B1 located behind the left vibration-damping member 8, a second bead B2 located in front of the left vibration-damping member 8, and a third bead B3 located in front of the right vibration-damping member 8. In the illustrated example, each bead B (B1, B2, B3) is an upwardly convex bead formed by press working on the panel material constituting the upper surface of the main body 5, and each extends in the vehicle width direction.

[0025] Right bracket 6 is the right front side member 2 R It is supported by and supports the right end of the main body 5 from above. The width of the right bracket 6 in the vehicle longitudinal direction is smaller than that of the main body 5, and the rear end 6 of the right bracket 6 E The right rear end 5 of the main body 5 RE It is located further forward than the right rear end 5. RE This is the right half of the main body 5, that is, the part located furthest to the rear of the region to the right of the center X in the vehicle width direction of the frame 4.

[0026] Right bracket 6 is the right front side member 2 R The main body 5 has a base portion 6a fastened to its upper surface by fasteners FN such as bolts, and an arm portion 6b extending from the upper surface of the base portion 6a. The arm portion 6b has a base end portion 6b1 connected to the base portion 6a and a left end portion 6b2 fastened to the upper surface of the right end of the main body 5 by fasteners FN such as bolts. The arm portion 6b is curved in a roughly L-shape when viewed from the rear, from the base end portion 6b1 to the left end portion 6b2.

[0027] Left bracket 7 is left front side member 2 L It is supported by and supports the left end of the main body 5 from above. The width of the left bracket 7 in the vehicle's longitudinal direction is smaller than that of the main body 5, and the rear end 7 of the left bracket 7 E This is the left rear end 5 of the main body 5. LE It is located further forward than the left rear end 5 LE This is the left half of the main body 5, that is, the part located furthest to the rear of the region to the left of the center X in the vehicle width direction of the frame 4.

[0028] Left bracket 7 is left front side member 2 L The main body 5 has a base portion 7a fastened to its upper surface by fasteners FN such as bolts, and an arm portion 7b whose right end 7b1 is fastened to the upper surface of the left end of the main body 5 by fasteners FN such as bolts. The arm portion 7b is curved in a roughly S-shape when viewed from the rear, from the base portion 7a to the right end 7b1.

[0029] As shown in Figures 4 and 5, the rear edge portion 4E of the frame 4 includes a first portion P1, a second portion P2, and a third portion P3 connecting them. The first portion P1 is the left-hand point of contact of a tangent line L that touches the contour of the edge portion 4E at two points in a plan view, and the second portion P2 is the right-hand point of contact. The first portion P1 is located to the left of the vehicle width center X of the frame 4, and the second portion P2 is located to the right of the vehicle width center X. The third portion P3 is located between the first portion P1 and the second portion P2, straddling the vehicle width center of the edge portion 4E. The first portion P1 is located further rear than the second portion P2, and the third portion P3 is located further forward than the tangent line L. In addition, a first bead B1 is formed on the first portion P1, providing high rigidity.

[0030] The electric wires W(W1, W2, W3) are routed so as to pass through the area sandwiched between the third portion P3 and the dash panel 1 facing the third portion P3 at the height of the frame 4. The electric wires W(W1, W2, W3) may also be routed so as to pass between the third portion P3 and the portion 1b of the dash panel 1 that faces the third portion P3 in the vehicle's longitudinal direction (see Figure 3; hereinafter also referred to as the first opposing portion 1b), as shown in Figures 3 and 4. More specifically, the electric wires W(W1, W2, W3) may be routed so as to pass through the gap between the third portion P3 and its opposing portion, the first opposing portion 1b, and cross the edge portion 4E of the frame 4 vertically. Note that the cross-sectional contours W of each electric wire W1, W2, W3 in Figures 3 and 4 are shown below. 1C ,W 2C ,W 3C These indicate the positions of the first wire W1, the second wire W2, and the third wire W3 at the height center of the main body 5, respectively.

[0031] Furthermore, as shown in Figure 4, the edge portion 4E of the frame 4 is the right rear end portion 5 of the main body portion 5. RE and the left rear end 5 of the main body 5 LE And the intermediate part 5 located between them C This includes the intermediate section 5. C The right rear end 5 is located to the right of the vehicle width center X. RE The portion located further to the left and forward, and the left rear end 5 to the left of the vehicle width center X. LE The section located further to the right and forward is smoothly connected to the intermediate section 5. C The right rear end 5 RE and left rear end 5 LE It includes the portion located further forward.

[0032] The electric wire W (W1, W2, W3) is at the height of frame 4, intermediate part 5 C and intermediate section 5 C The wires are routed to pass through the area sandwiched between the dash panel 1 facing it. As shown in Figures 3 and 4, the intermediate section 5 C And, the middle part 5 of the dash panel 1 C The wires may be routed so as to pass between the part 1c (see Figure 3, hereinafter also referred to as the second opposing part 1c) that faces the vehicle in the front-rear direction. More specifically, the electric wires W (W1, W2, W3) are routed between the intermediate part 5 C The cable may be routed so as to cross the edge portion 4E of the frame 4 vertically, passing through the gap between it and the second opposing portion 1c which is its opposite portion.

[0033] The effects and advantages of this embodiment will be described below.

[0034] (1) In the wire routing structure S, the rear edge portion 4E of the frame 4 has a first portion P1 and a second portion P2 which are the two contact points of the tangent wire L, and a third portion P3 located between them, with the third portion P3 located in front of the tangent wire L. Therefore, as shown in Figure 6, in the event of a frontal collision, the frame 4 is located in front of the front side member 2 L ,2 REven if it moves backward due to crushing and comes into contact with the dash panel 1, a gap or space is maintained between the third part P3 and its opposing part, the first opposing part 1b.

[0035] Furthermore, according to the wire routing structure S, the wires W (W1, W2, W3) are routed so that they pass through the area sandwiched between the third section P3 and the dash panel 1 facing the third section P3 at the height of the frame 4. Therefore, in the event of a frontal collision, the wires W are prevented from being pinched between the frame 4 and the dash panel 1. Even if the wires W (W1, W2, W3) were to come into contact with the third section P3 and the front of the dash panel 1, according to the wire routing structure S, the load applied to the frame 4 during a frontal collision is transmitted to the dash panel 1 via the first section P1 and the second section P2. Therefore, it is possible to prevent excessive load from being applied to the wires W.

[0036] (2) In addition, in the wire routing structure S, the wire W is at the height of the frame 4, intermediate part 5 C and intermediate section 5 C It is routed to pass through the area sandwiched between the dash panel 1 facing it. Intermediate section 5 C The right rear end 5 RE and left rear end 5 LE Because it includes a portion located further forward, it can more reliably prevent the power line W from being caught between the frame 4 and the dash panel 1 during a frontal collision.

[0037] (3) Furthermore, in the wire routing structure S, the first portion P1 of the edge portion 4E of the frame 4 is located further back than the second portion P2, so when the frame 4 contacts the dash panel 1, the first portion P1 is more likely to make contact before the second portion P2. With the wire routing structure S, a bead B is provided on the first portion P1, which increases the rigidity of the part that contacts the dash panel 1 first and improves the energy absorption during a frontal collision.

[0038] The embodiments described above are merely illustrative examples provided to facilitate understanding of the invention. The technical scope of the invention is not limited to the specific technical matters disclosed in the embodiments above, but also includes various modifications, changes, and alternative technologies that can be easily derived therefrom.

[0039] In the above embodiment, the left contact point (first portion P1) of the tangent L is positioned further back than the right contact point (second portion P2). However, the right contact point (second portion P2) may be positioned further back than the left contact point (first portion P1), or the positions of the left and right contact points in the vehicle's longitudinal direction may be aligned.

[0040] In the above embodiment, the left contact point (first portion P1) of the tangent L is positioned further back than the right contact point (second portion P2), and a bead B is provided on the left contact point (first portion P1). However, the right contact point may also be positioned further back than the left contact point, and a bead B may be provided on the right contact point.

[0041] In the above embodiment, the electric wire W (W1, W2, W3) is sandwiched between the third portion P3 and the dash panel 1 facing the third portion P3, and the intermediate portion 5 C and intermediate section 5 C The wires are routed to pass through the area sandwiched between the dash panel 1 facing the wires. However, the combination of wires W routed in these areas is not limited to this. For example, one or two of the first wire W1, second wire W2, and third wire W3 may be routed in either or both of the above areas. In addition, wires W other than the first wire W1, second wire W2, and third wire W3 may be routed in the above areas. An example of such a wire W is a standard charging cable W4 (see Figure 3) that connects the onboard charger CH to a charging port (not shown) provided on the vehicle V.

[0042] Although the above embodiment was described using an electric vehicle (EV) as an example, it goes without saying that the present invention can also be applied to hybrid vehicles (HV), fuel cell vehicles (FCV), and the like. [Explanation of Symbols]

[0043] V Electric Vehicle S Wire routing structure 1. Dashboard 1b The third part and the part facing the vehicle in the longitudinal direction. 2 L ,2 R Front side member 4 frames 4E Rear edge of the vehicle L tangent P1 1st part P2 second part P3 third part X: Center in the direction of vehicle width B Bead (Reinforcement Bead) B1 First Bead PDM Power Delivery Module (Electrical Equipment) 3. Battery (driving battery) IN Inverter (Inverter for driving the travel motor) CM Compressor (Air Conditioning Compressor) W electric wire W1 First wire (wire connecting electrical equipment and the traction battery) W2 Second wire (wire connecting electrical equipment and the inverter for driving the traction motor) W3 Third Wire (Wire connecting electrical equipment and air conditioning compressor)

Claims

1. A frame is installed between a pair of front side members in front of the vehicle, beyond the dash panel, The electrical equipment mounted on the aforementioned frame, At least the electrical equipment and the wires connecting the traction battery, the inverter for driving the traction motor, or the air conditioning compressor, Includes, A mount supporting the drive motor is attached to the outer part of the frame in the vehicle width direction. The rear edge of the frame includes a first portion which is one of the tangent lines that touch the contour of the edge at two points in a plan view, a second portion which is the other tangent line, and a third portion which connects them. The first portion is located on one side of the center of the frame in the vehicle width direction, and overlaps with the mount in the vehicle width direction when viewed in the vehicle front-rear direction. The second part is located on the other side of the center of the frame in the vehicle width direction, The third portion is located on the vehicle-front side of the tangent line. At least a portion of the electric wire is routed so as to pass through the area sandwiched between the third portion and the dash panel facing the third portion at the height of the frame. A wire routing structure for an electric vehicle, wherein the second portion is provided outside the vehicle width direction from the mount.

2. The first part is located further rearward than the second part of the vehicle. The electric vehicle wire routing structure according to claim 1, wherein a reinforcing bead is provided in the first portion.

3. The electric vehicle wire routing structure according to claim 1, wherein the third portion includes a rear end portion that is located furthest to the rear of the vehicle from the center of the frame in the vehicle width direction and extends in the vehicle width direction.

4. The aforementioned electric wires are provided in multiple locations. The electric vehicle wire routing structure according to claim 3, wherein the thinnest of the plurality of wires is positioned furthest to the other side in the vehicle width direction among the plurality of wires.

5. The second part is located further forward than the first part of the vehicle. The electric vehicle wire routing structure according to claim 1, wherein the third portion includes a fourth portion located on one side and forward of the vehicle, beyond the rear end portion which is located on the other side of the center of the frame in the vehicle width direction and extends in the vehicle width direction, and is located on the rearmost side of the other region of the frame.

6. The electric vehicle wire routing structure according to claim 1, wherein an opening is provided in the center of the frame in the vehicle width direction.

7. The electric vehicle wiring structure according to claim 5, wherein the region on the other side of the center of the dash panel in the vehicle width direction protrudes further forward than the region on the one side.

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