VEHICLE-BODY FRONT STRUCTURE INCLUDING A CONTACTLESS CHARGER

A vehicle-body front structure includes a pair of left and right side frames which extend from a front-side battery frame toward vehicle front to be positioned on vehicle-width-direction outer sides, a contactless charger between the left and right side frames, and a cross member between the left and right side frames. The contactless charger has a cross member housing configured to house the cross member.

BACKGROUND

Field

The present disclosure relates to a vehicle-body front structure for an electric vehicle, for example.

Description of Related Art

For example, in a vehicle-body front portion of an automobile which is disclosed in Patent Literature 1, a pair of left and right front side frames extending in a vehicle front-rear direction are provided, and a front sub-frame is provided below those front side frames and in rear of an engine room. In a left-side front end portion and a right-side front end portion of the front sub-frame, a left pipe frame and a right pipe frame are respectively provided to extend toward vehicle front. The left pipe frame and the right pipe frame are inclined with respect to a center line extending in a front-rear direction of a vehicle so as to be positioned on vehicle-width-direction outer sides toward a front side.

Patent Literature 1 discloses that the left pipe frame and the right pipe frame are inclined to be positioned on the vehicle-width-direction outer sides toward the front side and an impact load can thereby properly be absorbed in a case of an offset collision in which the impact load is input from oblique front of the vehicle.

CITATION LIST

Patent Literature

SUMMARY

Incidentally, in an electric vehicle, batteries with large capacities for supplying electric power to a traveling motor are installed. In order to improve convenience in charging the batteries, a contactless charger may be provided. Because in a case of an automobile, charging is presumed to be performed when the automobile stands still, a power transmission coil is to be provided in an area below the automobile which stands still (such as a ground surface of a parking lot or a floor surface of a garage, for example) and to set a position for disposing the contactless charger in the vehicle such that the contactless charger is arranged directly above the power transmission coil.

Because batteries are often disposed below a floor panel of a vehicle, when the contactless charger is below the floor panel, how to secure a minimum ground clearance becomes a problem. Further, because the contactless charger includes a large-sized coil for receiving a large current, each of a thickness dimension of the contactless charger and a dimension in a vehicle front-rear direction becomes long, and as a result, how to secure a departure angle becomes a problem.

The present disclosure has been made in consideration of such problems, and one or more embodiments is directed to improving layout characteristics of a contactless charger while sufficiently securing impact absorbability in an offset collision.

To solve the above and other problems, a first aspect of the present disclosure can be based on a vehicle-body front structure for an electric vehicle which includes a traveling motor and in which a battery casing housing a battery supplying electric power to the traveling motor is disposed below a floor panel. The vehicle-body front structure includes: a front-side battery frame which is provided in a front portion of the battery casing; a pair of left and right side frames which extend from the front-side battery frame toward vehicle front to be positioned on vehicle-width-direction outer sides toward front; a contactless charger which is arranged between the left and right side frames and receives a charging current for the battery from an outside; and a first cross member which is suspended between a portion in the left side frame, the portion being spaced apart from the front-side battery frame to the vehicle front, and a portion in the right side frame, the portion being spaced apart from the front-side battery frame to the vehicle front. The contactless charger has a cross member arrangement portion in which the first cross member is capable of being arranged.

In this configuration, in a case where a left side offset collision is presumed in which an impact load is input from obliquely left front, for example, because the left side frame extends so as to correspond to an input direction of the impact load, the impact load from the obliquely left front is input generally along an axis direction of the left side frame, and the impact load is absorbed by the left side frame. In addition, the impact load input to the left side frame is transmitted to the front-side battery frame and is thus also absorbed by the front-side battery frame. In this case, because the left and right side frames are in a state where those are coupled together by the first cross member, the left side frame is less likely to collapse but is more likely to be axially compressed. The same applies to a right side offset collision.

Because the left and right side frames are positioned on the vehicle-width-direction outer sides toward the front, a wide space in a vehicle width direction is formed between both of the side frames, that is, on a lower side of a vehicle-body front portion. The inventors appreciated that, by arranging the contactless charger in the space, securing a minimum ground clearance and a departure angle may be realized. Furthermore, a large-sized coil can be housed in the contactless charger, allowing the contactless charger to receive a large current in charging.

Further, an intermediate portion of the first cross member in the vehicle width direction is also arranged in the space, but because the intermediate portion of the first cross member in the vehicle width direction is arranged in the cross member arrangement portion of the contactless charger, layout characteristics of the contactless charger are improved. In other words, the inventors appreciated that by accommodating the cross member without increasing a thickness of the contactless charger, the above and other problems may be addressed.

The first cross member according to a second aspect of the present disclosure may have an intermediate member portion which is positioned in an intermediate portion in a vehicle width direction and is arranged in the cross member arrangement portion and outside member portions which extend from both end portions of the intermediate member portion in the vehicle width direction toward vehicle-width-direction outer sides and are coupled with the left and right side frames.

In a third aspect of the present disclosure, a second cross member which is suspended between the left and right side frames may be provided in vehicle rear of the contactless charger.

In this configuration, in a case where an impact load is input from front, because the second cross member is positioned in the rear of the contactless charger, the contactless charger can be deformed or destroyed in front of the second cross member. Accordingly, it becomes possible to absorb an impact by using the contactless charger.

In a fourth aspect of the present disclosure, the cross member arrangement portion of the contactless charger can be configured with a recess portion which is capable of housing the first cross member. In this configuration, the contactless charger may be attached such that the first cross member is housed in the recess portion of the contactless charger when the vehicle is manufactured, for example, and attachment workability becomes high.

The recess portion according to a fifth aspect of the present disclosure may have a shape which is open in a lower surface of the contactless charger.

In a sixth aspect of the present disclosure, the vehicle-body front structure may include a pair of left and right impact absorption members which extend toward vehicle front of the first cross member. In this case, a front portion of the contactless charger can be positioned between the left and right impact absorption members.

In this configuration, for example, because the contactless charger can be arranged by using a space between the impact absorption members which are compressed and deformed in a minor collision, it becomes possible to increase the size of the contactless charger, and a large-sized coil can easily be housed.

Advantageous Effects

As described above, a cross member is provided which is suspended between a pair of left and right side frames positioned on vehicle-width-direction outer sides toward front, and a cross member arrangement portion in which the cross member is capable of being arranged is provided in a contactless charger which is arranged between the left and right side frames. Accordingly, layout characteristics of the contactless charger can be improved while impact absorbability in an offset collision is sufficiently secured.

DETAILED DESCRIPTION

An embodiment will hereinafter be described in detail based on drawings. Note that the description of a preferable embodiment in the following is substantially only about examples and is not at all intended to restrict the present disclosure, applications thereof, or uses thereof.

FIG.1is a left side view of an electric vehicle (electric automobile)1including a vehicle-body front structure A according to the embodiment. As illustrated inFIG.2, the electric vehicle1includes a lower structure2and an upper structure3. InFIG.1, a front bumper, a rear bumper, front and rear wheels, and so forth are omitted and are illustrated by imaginary lines, and each portion is schematically illustrated. InFIG.2, in addition to the components omitted inFIG.1, doors, a bonnet hood, a front fender, window glass, front and rear lighting devices, interior materials, and so forth are omitted, and each portion is schematically illustrated.

Note that in the description of the embodiment, a vehicle front side will simply be referred to as “front”, a vehicle rear side will simply be referred to as “rear”, a vehicle right side will simply be referred to as “right”, and a vehicle left side will simply be referred to as “left”. A right-left direction of the vehicle is a vehicle width direction.

As illustrated inFIG.1, the electric vehicle1is a passenger automobile. The electric vehicle1may be of any of a sedan type, a hatch-back type, a minivan type, and so forth, and its shape is not particularly limited. As illustrated inFIG.2, in the electric vehicle1, a vehicle cabin R1is formed which serves as a staying space for an occupant. As illustrated inFIG.1, a front seat S1is provided on a front side in the vehicle cabin R1, and a rear seat S2is provided in rear of the front seat S1in the vehicle cabin R1. In the rear of the rear seat S2, a trunk R2is provided in accordance with necessity. The vehicle cabin R1and the trunk R2are provided to the upper structure3. Note that in the vehicle cabin R1, only the front seat S1may be provided, or a third row seat may be provided in the rear of the rear seat S2.

Meanwhile, a space in front of the vehicle cabin R1as a front portion of the electric vehicle1can be set as a power chamber R3, for example. That is, the vehicle-body front structure A is provided to the electric vehicle1which includes a front-side traveling motor M1, a rear-side traveling motor M2, batteries B supplying electric power to the traveling motors M1and M2, and a battery casing10housing the batteries B. The battery casing10is disposed below a floor panel70described later.

The front-side traveling motor M1produces a driving force for driving left and right front wheels FT, and the front-side power train PT1is configured with only the front-side traveling motor M1or with the front-side traveling motor M1, a speed reducer, a transmission, and so forth. Further, the rear-side traveling motor M2produces a driving force for driving left and right rear wheels RT, and a rear-side power train PT2is configured with only the rear-side traveling motor M2or with the rear-side traveling motor M2, a speed reducer, a transmission, and so forth.

In the present embodiment, the rear-side traveling motor M2is configured to produce a highest output (maximum torque) which is high compared to the front-side traveling motor M1, and the rear-side traveling motor M2has a larger size than the front-side traveling motor M1. Accompanying that, the rear-side power train PT2becomes larger than the front-side power train PT1. Note that the rear-side traveling motor M2may produce a highest output which is low compared to the front-side traveling motor M1, or the rear-side traveling motor M2and the front-side traveling motor M1may produce equivalent highest outputs. Further, only the front-side power train PT1may be provided, or only the rear-side power train PT2may be provided.

As illustrated inFIG.2, the lower structure2includes the battery casing10, a pair of left and right front side frames11and12which extend forward in front of the battery casing10, and a pair of left and right rear frame13and14which extend rearward in the rear of the battery casing10. A reference numeral11denotes the left front side frame, and a reference numeral12denotes the right front side frame. A reference numeral13denotes the left rear frame, and a reference numeral14denotes the right rear frame.

In a case of a common electric automobile, a battery casing is often formed as a separate body from a vehicle body and is often detachable from a portion below a floor; however, in the present embodiment, not only the battery casing10but also the left and right front side frames11and12and the left and right rear frames13and14are integrated with the battery casing10, and the front side frames11and12and the rear frames13and14together with the battery casing10are detachable from the upper structure3.

Specifically, the electric vehicle1of the present embodiment is configured to be capable of being divided, in an up-down direction, into the lower structure2having the battery casing10and the upper structure3forming the vehicle cabin R1and the trunk R2. Being capable of being divided in the up-down direction means that without using welding, adhesion, or the like, the lower structure2is integrated with the upper structure3by using fastening members such as bolts, nuts, and screws. Accordingly, because the lower structure2can be separated from the upper structure3in accordance with necessity when maintenance or repairs are performed after the electric vehicle1is passed into the hands of a user, high maintainability is achieved. Note that fastening members used in the following description include bolts, nuts, screws, and so forth.

Here, as a vehicle-body structure of an automobile, a vehicle-body structure of a ladder frame type has been known. In a case of the vehicle-body structure of the ladder frame type, the vehicle-body structure is being capable of being divided, in the up-down direction, into a ladder frame and a cabin, but the ladder frame continuously extends in a front-rear direction and thus mainly receives a collision load in a front collision and a rear collision. In a side collision, the ladder frame only subsidiarily receives a collision load, and the collision load is mainly received by the cabin. As described above, in the vehicle-body structure of the ladder frame type, usually, different members receive collision loads between the front collision and rear collision and the side collision.

On the other hand, in a case of the electric vehicle1of the present embodiment, the lower structure2having the front side frames11and12and the rear frame13and14and the upper structure3are capable of being divided; however, a technical idea of the present embodiment is largely different from the vehicle-body structure of the ladder frame type in related art in the point that in both cases of the front collision and rear collision and the side collision, a collision load is received by the lower structure2and the upper structure3, and the collision load is capable of being dispersedly absorbed by both of the structures2and3. In the following, structures of the lower structure2and the upper structure3will be described in detail.

First, the upper structure3will be described. As illustrated inFIG.2, the upper structure3includes the floor panel70, a dash panel71, a pair of left and right front main frames72and73, and a pair of left and right side sills74and75. A reference numeral72denotes the left front main frame, and a reference numeral73denotes the right front main frame. A reference numeral74denotes the left side sill, and a reference numeral75denotes the right side sill.

The floor panel70configures a floor surface of the vehicle cabin R1and is formed with a steel plate or the like which extends in the front-rear direction and extends also in the left-right direction. A space above the floor panel70serves as the vehicle cabin R1. A roof80is provided to an upper portion of the vehicle cabin R1. Further, in both of left and right side portions of the upper structure3, front openings3aand rear openings3bare formed. As illustrated inFIG.1, the front opening3aand the rear opening3bare capable of being opened and closed by a front door81and a rear door82, respectively. A front door and a rear door may be disposed on a right side of the upper structure3to be capable of being opened and closed.

The dash panel71is a member for partitioning the vehicle cabin R1from the power chamber R3in the front-rear direction. The dash panel71is configured with a steel plate or the like, for example, extends in the left-right direction, and extends also in an up-down direction. On both of left and right sides of a front portion of the upper structure3, left and right front wheel well portions85and86for housing the left and right front wheels FT are respectively provided. A left end portion of the dash panel71is connected with the left front wheel well portion85, and a right end portion of the dash panel71is connected with the right front wheel well portion86.

The left and right front main frames72and73are disposed in a vehicle-body front portion and are highly strong members which extend in the front-rear direction. That is, the left and right front main frames72and73are positioned in front of the floor panel70, are positioned above the floor panel70, and are specifically disposed to extend forward from both of left and right sides in a lower portion of the dash panel71.

The left and right front main frames72and73form a left-right symmetrical structure and can be configured by joining plural press-formed materials or can be configured with the extruded material, for example. A cross section of each of the front main frames72and73in a direction orthogonal to the front-rear direction is set larger than a cross section of each of the front side frames11and12of the lower structure2in the same direction. Accordingly, the front main frames72and73become thick and highly strong members compared to the front side frames11and12.

Front end portions of the left and right front main frames72and73respectively have the crush cans72aand73awhich perform compressive deformation in a front collision and absorb collision energy. The crush cans72aand73aare tubular members which extend in the front-rear direction. The crush cans72aand73aperform compressive deformation due to an impact load from the front in a phase previous to deformation of the front main frames72and73and thereby absorb the impact load. The front bumper reinforcement87extending in the left-right direction is fixed to front end portions of the left and right crush cans72aand73a.

The left and right side sills74and75are respectively disposed in both of left and right end portions of the floor panel70to extend in the front-rear direction. The left end portion of the floor panel70is connected with an intermediate portion of the left side sill74in the up-down direction, and the right end portion of the floor panel70is connected with an intermediate portion of the right side sill75in the up-down direction. Upper-side portions of the side sills74and75are protruded upward from connection portions with the floor panel70, and lower-side portions of the side sills74and75are protruded downward from the connection portions with the floor panel70. Because the battery casing10is arranged below the floor panel70, the battery casing10is arranged such that the lower-side portions of the side sills74and75overlap with the battery casing10in a vehicle side view. The battery casing10is fixed to the side sills74and75.

Next, the lower structure2will be described. The lower structure2includes the front and rear power trains PT1and PT2, the front wheels FT, the rear wheels RT, front suspension apparatuses20, rear suspension apparatuses21, and so forth in addition to the battery casing10, the front side frames11and12, and the rear frames13and14. Forms of the front suspension apparatus20and the rear suspension apparatus21are not particularly specified.

The battery casing10is a large casing which is formed, below the floor panel70of the upper structure3, to be spanned from a left end portion vicinity to a right end portion vicinity of the floor panel70and to be spanned from a front end portion vicinity to a rear end portion vicinity of the floor panel70. As described above, the battery casing10is provided in a wide range of a lower region of the floor panel70, and it thereby becomes possible to install the battery B with a large capacity in the electric vehicle1. The battery B may be a lithium-ion battery, a solid-state battery, or the like or may be another secondary cell. Further, the battery B may be a so-called battery cell or may be a battery pack housing plural battery cells. In the present embodiment, the battery B is configured with a battery pack, and plural battery packs are installed in a state where those are aligned in the front-rear direction and the left-right direction.

The battery casing10includes a left-side battery frame30, a right-side battery frame31, a front-side battery frame32, a rear-side battery frame33, a bottom plate34, and the lid body35(illustrated inFIG.3).FIG.2illustrates a state where the lid body35is detached.

The left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33are configured with an extruded material or the like of an aluminum alloy, for example, but may be configured with an aluminum alloy plate material or a press-formed material of a steel plate as well. The bottom plate34can be configured with an extruded material. In the following description, “extruded material” denotes an extruded material of an aluminum alloy, and “press-formed material” denotes an aluminum alloy plate material or a press-formed material of a steel plate. Further, each member may be configured with a casting, for example.

All of cross-sectional shapes of the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33in respective orthogonal directions to their longitudinal directions are rectangular shapes. Further, the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33are all arranged at the same height and extend in generally horizontal directions.

The left-side battery frame30is provided to a left-side portion of the battery casing10and extends in the front-rear direction. The right-side battery frame31is provided to a right-side portion of the battery casing10and extends in the front-rear direction. Further, the front-side battery frame32is provided to a front portion of the battery casing10and extends in the left-right direction. The rear-side battery frame33is provided to a rear portion of the battery casing10and extends in the left-right direction.

A left end portion of the front-side battery frame32is connected with a front end portion of the left-side battery frame30, and a right end portion of the front-side battery frame32is connected with a front end portion of the right-side battery frame31. A left end portion of the rear-side battery frame33is connected with a rear end portion of the left-side battery frame30, and a right end portion of the rear-side battery frame33is connected with a rear end portion of the right-side battery frame31. Consequently, the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33form a rack which surrounds all of the batteries B in a plan view.

The bottom plate34extends generally horizontally and is fixed to lower surfaces of the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33. Further, the lid body35is fixed to the lower surfaces of the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33. Consequently, a battery housing space S housing the batteries B (illustrated inFIG.2) is marked off and formed with the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, the rear-side battery frame33, the bottom plate34, and the lid body35.

The size of the battery housing space S can be changed in accordance with the capacity of the installed batteries B. The size of the battery housing space S is capable of being easily changed by changing lengths of the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33and a shape of the bottom plate34. For example, in a case where the electric vehicle1is a small vehicle which has a short wheelbase and narrow treads, the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, the rear-side battery frame33are made short, the shapes of the bottom plate34and the lid body35are made small in response to the shortening, and the battery housing space S thereby becomes small in accordance with the small vehicle. On the other hand, in a case of a large vehicle, the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33are made long, the shapes of the bottom plate34and the lid body35are made large in response to the elongation, and the battery housing space S thereby becomes large in accordance with the large vehicle. In a case where the left-side battery frame30, the right-side battery frame31, the front-side battery frame32, and the rear-side battery frame33are configured with the extruded material, the lengths can easily be changed. Further, the bottom plate34can be configured with the extruded material, and its shape can thereby easily be changed.

An upper portion of the battery housing space S may be closed by the above lid body35or may be closed by the floor panel70of the upper structure3. In the battery housing space S, other than the batteries B, a cooling device cooling the batteries B, a heating device heating the batteries B, and so forth (temperature adjustment devices) can also be provided. Further, electric power of the batteries B is supplied to the traveling motors M1and M2via a control device. In the present embodiment, the batteries B may be charged via a contactless charger4illustrated inFIG.2, and the batteries B are configured to be capable of being charged by a charging socket.

As illustrated inFIG.2, in the internal portion of the battery casing10, as strength members extending in the left-right direction, first to third inside-casing members25A,25B, and25C are provided. All of heights of the first to third inside-casing members25A,25B, and25C are the same and are generally the same as the heights of the left-side battery frame30and so forth. The inside-casing members25A,25B, and25C may be configured with the extruded material or may be configured with the press-formed material. In the present embodiment, three inside-casing members25A,25B, and25C are provided, but the number of inside-casing members25A,25B, and25C may be increased or decreased in accordance with the dimension of the battery casing10in the front-rear direction.

The first to third inside-casing members25A,25B, and25C are arranged at distances from each other in the front-rear direction, the first inside-casing member25A is in a foremost position, and the third inside-casing member25C is in a rearmost position. A lower portion of each of the inside-casing members25A,25B, and25C is fixed to an upper surface of the bottom plate34. Further, a left end portion of each of the inside-casing members25A,25B, and25C is fixed to an inner surface (right-side surface) of the left-side battery frame30, and a right end portion of each of the inside-casing members25A,25B, and25C is fixed to an inner surface (left-side surface) of the right-side battery frame31. In other words, the inside-casing members25A,25B, and25C are members which connect the left-side battery frame30and the right-side battery frame31together.

In the internal portion of the battery casing10, as strength members extending in the front-rear direction, a front central member26and first to third rear central members (rear reinforcement members)27to29are provided. The front central member26and the first to third rear central members27to29are arranged at generally the same heights and are provided at a center of the battery casing10in the left-right direction. Lower end portions of the front central member26and the first to third rear central members27to29are mounted on the upper surface of the bottom plate34.

The front central member26is arranged between the front-side battery frame32and the first inside-casing member25A, a front end portion of the front central member26is fixed to a central portion of the front-side battery frame32in the left-right direction, and a rear end portion of the front central member26is fixed to a central portion of the first inside-casing member25A in the left-right direction. Consequently, the front-side battery frame32is a member which extends so as to connect the front end portions of the left-side battery frame30and the right-side battery frame31with the front end portion of the front central member26.

The first rear central member27is arranged between the first inside-casing member25A and the second inside-casing member25B, a front end portion of the first rear central member27is fixed to the central portion of the first inside-casing member25A in the left-right direction, and a rear end portion of the first rear central member27is fixed to a central portion of the second inside-casing member25B in the left-right direction. Further, the second rear central member28is arranged between the second inside-casing member25B and the third inside-casing member25C, a front end portion of the second rear central member28is fixed to the central portion of the second inside-casing member25B in the left-right direction, and a rear end portion of the second rear central member28is fixed to a central portion of the third inside-casing member25C in the left-right direction. Further, the third rear central member29is arranged between the third inside-casing member25C and the rear-side battery frame33, a front end portion of the third rear central member29is fixed to the central portion of the third inside-casing member25C in the left-right direction, and a rear end portion of the third rear central member29is fixed to a central portion of the rear-side battery frame33in the left-right direction. Consequently, because the first to third inside-casing members25A,25B, and25C and the front central member26and first to third rear central members27to29are disposed in a lattice manner in the internal portion of the battery casing10and are coupled with each other, a reinforcement effect for the battery casing10is further enhanced.

When an imaginary straight line extending in the front-rear direction is presumed in a plan view, the positions of the front central member26and the first to third rear central members27to29in the left-right direction are set such that the positions are arranged on the imaginary straight line. In other words, the first to third rear central members27to29are provided to be positioned on a rearward imaginary extension line of the front central member26. Note that the front central member26and the first to third rear central members27to29may be configured with one member which is continuous in the front-rear direction.

As illustrated inFIGS.4to6and so forth, the vehicle-body front structure A includes the pair of left and right front side frames11and12, a frame bracket40, a first cross member15, a pair of left and right impact absorption members16and17, and a second cross member19. In the present embodiment, in addition to the above members, the vehicle-body front structure A includes a front member18, reinforcement members19A and19B, and so forth. The second cross member19may overlap the front suspension apparatus20. Members configuring the vehicle-body front structure A are not limited to the above-described members and may include other members, apparatuses, devices, and so forth.

The front side frames11and12linearly and generally horizontally extend below left and right front main frames72and73provided to the upper structure3. The front side frames11and12can be configured with the extruded material, the press-formed material, or the like, for example. In the present embodiment, because the front side frames11and12are configured with the extruded material, their cross-sectional shapes in a direction orthogonal to the front-rear direction are generally equivalent from front end portions to rear end portions.

The left and right front side frames11and12are mounted on the front-side battery frame32configuring the front portion of the battery casing10via the frame bracket40. In other words, rear portions of the left and right front side frames11and12are coupled with the front-side battery frame32by the frame bracket40. The frame bracket40is an integrally formed component of metal and extends in the left-right direction along a front surface of the front-side battery frame32. The rear portions of the left and right front side frames11and12are fixed to the frame bracket40. Metal which configures the frame bracket40is not particularly limited. For example, aluminum and so forth can be raised, and in this case, the frame bracket40can be formed by aluminum die-casting.

The left and right front side frames11and12are mounted on the front-side battery frame32via the frame bracket40, but the rear portions of the front side frames11and12are caused to adjoin the front surface of the front-side battery frame32. Consequently, the front side frames11and12extend forward from the front-side battery frame32. Note that the rear portion of the front side frames11and12may slightly be spaced apart forward from the front surface of the front-side battery frame32. In this case also, viewing those as the whole, it can be considered that the front side frames11and12extend forward from the front-side battery frame32.

The rear portion of the left front side frame11is arranged to correspond to a section on a left side of a center of the front-side battery frame32in the left-right direction. Further, the rear portion of the right front side frame12is arranged to correspond to a section on a right side of the center of the front-side battery frame32in the left-right direction. Accordingly, a distance between the left and right front side frames11and12becomes a predetermined distance. A distance between the rear portions of the front side frames11and12is set narrower than a distance between the left-side battery frame30and the right-side battery frame31of the battery casing10.

Heights of the left and right front side frames11and12are generally the same. Further, the left and right front side frames11and12, the front central member26of the battery casing10, the left-side battery frame30, and the right-side battery frame31are disposed at generally the same heights.

The left and right front side frames11and12extend to be positioned on the vehicle-width-direction outer sides toward the front. That is, the left front side frame11is inclined, e.g., forms a negative acute angle, with respect to the imaginary straight line extending in the front-rear direction of the vehicle in a plan view so as to be positioned on a left side toward the front. Further, the right front side frame12is inclined, e.g., forms a positive acute angle, with respect to the imaginary straight line extending in the front-rear direction of the vehicle in a plan view so as to be positioned on a right side toward the front. Accordingly, the distance between the left and right front side frames11and12(a separation distance in the vehicle width direction) becomes wider toward the front, e.g., increases from the rear portions to the front portions. A space C is formed in a portion between the left and right front side frames11and12, a space C is formed in which all or a part of various components, apparatuses, devices, and so forth are capable of being arranged. Then, the space C has a shape which is enlarged in the vehicle width direction toward the front. Additionally, a distance of the front portions of the front side frames11and12may be narrower than a distance between the left-side battery frame30and the right-side battery frame31of the battery casing10.

In the present embodiment, the contactless charger4is arranged in the space C formed between the left and right front side frames11and12. The contactless charger4is configured to be capable of receiving a charging current for the batteries B, e.g., from the outside. Specifically, the electric vehicle1conforms to a system which wirelessly transmits electric power by using electromagnetic induction (wireless power transmission system). The wireless power transmission system may include a power transmission coil placed directly below the electric vehicle1which stands still and the contactless charger4of a vehicle-mounted type. The power transmission coil may be placed in a ground surface of a parking lot, a floor surface of a garage, or the like, for example.

The contactless charger4includes a power reception coil, a control device, and so forth and a housing4A which houses those. Electric power received by the power reception coil of the contactless charger4is supplied to the batteries B and is used as the charging current. The housing4A is formed into a shape which is flat in the front-rear direction and the left-right direction, for example. An electric power cable or the like may extend from the housing4A. With the electric power cable, the batteries B may be directly or indirectly connected.

An inclination angle of the left front side frame11with respect to the above imaginary straight line is equivalent to an inclination angle of a right front side frame12with respect to the above imaginary straight line. A front portion of the left front side frame11is arranged on a vehicle-width-direction inner side of the left-side battery frame30of the battery casing10. Further, a front portion of the right front side frame12is arranged on the vehicle-width-direction inner side of the right-side battery frame31of the battery casing10.

Further, as illustrated inFIG.1, positions, in the front-rear direction, of the front portions of the left and right front side frames11and12and of front portions of the left and right front main frames72and73of the upper structure3are set to generally the same positions.

As illustrated inFIG.7, the frame bracket40includes a vertical plate portion40awhich extends in the vehicle width direction and the up-down direction along the front surface of the front-side battery frame32and a lower plate portion40bwhich extends rearward from a lower edge portion of the vertical plate portion40aalong the lower surface of the front-side battery frame32and which extends also in the vehicle width direction. The vertical plate portion40aand the lower plate portion40bare fixed to the front-side battery frame32by fastening members or the like. In such a manner, the vertical plate portion40aand the lower plate portion40bof the frame bracket40are respectively fixed to the front surface and the lower surface of the front-side battery frame32, and mounting rigidity of the frame bracket40on the front-side battery frame32can thereby be enhanced.

In the vertical plate portion40aof the frame bracket40, a left-side insertion hole40cinto which the rear portion of the left front side frame11is inserted and a right-side insertion hole40dinto which the rear portion of the right front side frame12is inserted are formed at a distance in the vehicle width direction. The rear portion of the left front side frame11is fixed to the frame bracket40by an adhesive, a fastening member, or the like, for example, in a state where the rear portion is inserted into the left-side insertion hole40c.

As illustrated inFIG.5, the frame bracket40includes a left-side upper plate portion40ewhich extends in the front-rear direction so as to cover an upper surface of the left front side frame11and a right-side upper plate portion40fwhich extends in the front-rear direction so as to cover an upper surface of the right front side frame12. The left-side upper plate portion40eand the upper surface of the left front side frame11are caused to adhere to each other by an adhesive, for example, and the right-side upper plate portion40fand the upper surface of the right front side frame12are similarly caused to adhere to each other. Accordingly, the left and right front side frames11and12can firmly be fixed to the frame bracket40.

The frame bracket40has a left-side support portion41and a right-side support portion42, and the left-side support portion41and the right-side support portion42are integrally shaped with the vertical plate portion40aand the lower plate portion40b. The left-side support portion41is a portion which is arranged on the vehicle-width-direction outer side (left side) of the left front side frame11and supports the above front side frame11from the vehicle-width-direction outer side. Specifically, the left-side support portion41is protruded forward from a left-side portion of the left-side insertion hole40cin the vertical plate portion40aand extends along a left side surface of the left front side frame11. A front portion of the left-side support portion41reaches the vicinity of a central portion of the left front side frame11in the front-rear direction, and it thus becomes possible to support a wide range of the left-side support portion41by the left-side support portion41. It is also possible to cause the left front side frame11to adhere to the left-side support portion41.

Further, the right-side support portion42is a portion which is arranged on the vehicle-width-direction outer side (right side) of the right front side frame12and supports the above front side frame12from the vehicle-width-direction outer side. Specifically, the right-side support portion42is protruded forward from a right-side portion of the right-side insertion hole40din the vertical plate portion40aand extends along a right side surface of the right front side frame12. A front portion of the right-side support portion42reaches the vicinity of a central portion of the right front side frame12in the front-rear direction, and it thus becomes possible to support a wide range of the right-side support portion42by the right-side support portion42. It is also possible to cause the right front side frame12to adhere to the right-side support portion42.

On the vehicle-width-direction outer side of the frame bracket40, left and right suspension arms20A configuring the front suspension apparatuses20are supported to be swingable in the up-down direction. That is, in a portion on a left side of the left-side support portion41in the frame bracket40, a left-side arm mounting portion43protrudes to a left side. On the left-side arm mounting portion43, a base end portion of the left suspension arm20A is mounted to be rotatable around a shaft extending in the front-rear direction. Further, in a portion on a right side of the right-side support portion42in the frame bracket40, a right-side arm mounting portion44protrudes to a right side. On the right-side arm mounting portion44, a base end portion of the right suspension arm20A is mounted to be rotatable around a shaft extending in the front-rear direction.

The first cross member15is between a portion of the left front side frame11spaced apart forward from the front-side battery frame32and a portion of the right front side frame12spaced apart forward from the front-side battery frame32, and linearly extends in the vehicle width direction. The first cross member15can also be configured with the extruded material, the press-formed member, or the like. In the present embodiment, a left-side portion of the first cross member15is fixed to the front portion of the left front side frame11, and a right-side portion of the first cross member15is fixed to the front portion of the right front side frame12. Consequently, the front portions of the left and right front side frames11and12are coupled with each other by the first cross member15. The first cross member15may be closer to the front member18than to the front suspension20.

Further, the first cross member15is generally parallel with the front-side battery frame32. Accordingly, in a plan view, a quadrilateral shape (a trapezoidal shape, e.g., an isosceles trapezoid, in the present example) is formed with the first cross member15, the left and right front side frames11and12, and the front-side battery frame32, and a closed cross-section is configured when a horizontal cross section is seen.

A left side of the first cross member15is protruded to the vehicle-width-direction outer side of the front portion of the left front side frame11. Further, a right side of the first cross member15is protruded to the vehicle-width-direction outer side of the front portion of the right front side frame12.

The first cross member15has an intermediate member portion15A in an intermediate portion in the vehicle width direction and left and right outside member portions15B and15C which extend from both end portions of the intermediate member portion15A in the vehicle width direction toward vehicle-width-direction outer sides and are coupled with the left and right front side frames11and12. The intermediate member portion15A is in the space C formed between the left and right front side frames11and12. The left outside member portion15B is fixed to the left front side frame11. The right outside member portion15C is fixed to the right front side frame12. The contactless charger4may extend from the intermediate member portion15A further to the vehicle front than to the vehicle back, e.g., as a width of the space C increases.

In the space C formed between the left and right front side frames11and12, both the intermediate member portion15A and the contactless charger4are arranged. Because the contactless charger4includes a large-sized coil for receiving a large current, its dimension in the front-rear direction becomes long. The contactless charger4is in a positional relationship in which a part of the contactless charger4overlaps with the intermediate member portion15A in a plan view. As a measure against this, the contactless charger4may be above the intermediate member portion15A, but in such a case, the contactless charger4is spaced apart from the power transmission coil, and charging efficiency is lowered. Alternatively, the contactless charger4may be below the intermediate member portion15A, but in such a case, a minimum ground clearance becomes low. As a further alternative, the contactless charger4may be below the floor panel70, but because the batteries B are installed below the floor panel70, how to secure the minimum ground clearance becomes a problem. As a still further alternative, the contactless charger4may be below a vehicle-body rear portion, but because the contactless charger4includes a large-sized coil as described above, each of a thickness dimension and the dimension in the front-rear direction is long, and as a result, how to secure a departure angle becomes a problem.

In the present embodiment, in order to establish a layout even in the positional relationship in which a part of the contactless charger4overlaps with the intermediate member portion15A of the first cross member15in a plan view, the contactless charger4has a cross member arrangement portion4aor cross member housing in which the intermediate member portion15A of the first cross member15can be accommodated.

Specifically, as illustrated inFIG.8and so forth, the cross member arrangement portion4ais a recess portion that can house the intermediate member portion15A. In particular, the cross member arrangement portion4amay have a shape that is open in a lower surface of the housing4A of the contactless charger4. As illustrated inFIG.6, because the intermediate member portion15A is continuous in the left-right direction, the cross member arrangement portion4ais also continuous in the left-right direction from a left end portion to a right end portion of the housing4A while corresponding to the shape of the intermediate member portion15A. In other words, the cross member arrangement portion4ais a groove portion to house the intermediate member portion15A. An inner surface of the cross member arrangement portion4amay or may not contact the intermediate member portion15A.

Because the cross member arrangement portion4ais open downward, the contactless charger4may be attached such that the first cross member15is housed in the cross member arrangement portion4aof the contactless charger4when the vehicle is manufactured, for example, and attachment workability becomes high. The first cross member15is housed in the cross member arrangement portion4a, it thereby becomes possible to lower the contactless charger4to the vicinity of a lower end of the vehicle body, and charging efficiency is improved.

In a case where the first cross member15is inclined with respect to a center line in a vehicle front-rear direction, the cross member arrangement portion4amay be inclined so as to correspond to the first cross member15. Further, in a case where plural first cross members15are provided, plural cross member arrangement portions4acan be formed.

Because the cross member arrangement portion4ais provided to the flat housing4A, a dimension of the cross member arrangement portion4ain the up-down direction is set equivalent to or more than ½ of a dimension of the housing4A in the up-down direction. Note that the dimension of the cross member arrangement portion4ain the up-down direction is not particularly limited, and it is sufficient that the dimension is shorter than the dimension of the housing4A in the up-down direction.

In an internal portion of the housing4A, coils can respectively be housed in a portion on a front side of and a portion on a rear side of the cross member arrangement portion4a. In addition, the coil may be housed only in one of the portion on the front side of and the portion on the rear side of the cross member arrangement portion4aand to house a control device or the like in the other. Further, a control device or the like may be housed in a portion above the cross member arrangement portion4ain the internal portion of the housing4A.

The second cross member19is arranged in the rear of the contactless charger4. Specifically, the second cross member19is between the first cross member15and the front-side battery frame32and between the left front side frame11and the right front side frame12, and linearly extends in the vehicle width direction. The second cross member19can also be configured with the extruded material, the press-formed member, or the like. A dimension of the second cross member19in the vehicle width direction is shorter than a dimension of the first cross member15in the vehicle width direction.

As also illustrated inFIG.7, a left end portion of the second cross member19is fixed to a right side surface of the left front side frame11by adhesion, welding, a fastening member, or the like. A right end portion of the second cross member19is similarly fixed to a left side surface of the right front side frame12. Accordingly, intermediate portions of the left and right front side frames11and12in the front-rear direction are coupled with each other.

Further, the second cross member19is generally parallel with the front-side battery frame32. Accordingly, in a plan view, a quadrilateral shape (a trapezoidal shape in the present example) is formed with the second cross member19, the left and right front side frames11and12, and the front-side battery frame32, and a closed cross-section is configured when a horizontal cross section is seen. Further, in a plan view, a quadrilateral shape is also formed with the second cross member19, the left and right front side frames11and12, and the first cross member15.

As illustrated inFIG.5, the left reinforcement member19A extends rearward from a portion on a left side of a central portion of the second cross member19in the vehicle width direction to the front-side battery frame32. A rear portion of the left reinforcement member19A is fixed to the right side surface of the left front side frame11. Further, the right reinforcement member19B extends rearward from a portion on a right side of the central portion of the second cross member19in the vehicle width direction to the front-side battery frame32. A rear portion of the right reinforcement member19B is fixed to the left side surface of the right front side frame12.

The left impact absorption member16is provided in front of the left front side frame11and is configured with a tubular member which extends forward. Further, the right impact absorption member17is provided in front of the right front side frame12and is configured with a tubular member which extends forward. Similarly to crush cans72aand73aof the upper structure3, the impact absorption members16and17perform compressive deformation due to an impact load from the front in a phase previous to deformation of the front side frames11and12and thereby absorb the impact load. As illustrated inFIG.1, positions, in the front-rear direction, of rear portions of the left and right impact absorption members16and17and of rear portions of the crush cans72aand73aof the upper structure3are set to generally the same positions.

The rear portion of the left impact absorption member16is fixed to the front portion of the left front side frame11. A direction in which the left impact absorption member16extends is along the longitudinal direction of the left front side frame11, and an axis line of the impact absorption member16is positioned on a forward extension line of the front side frame11. Further, the rear portion of the right impact absorption member17is fixed to the front portion of the right front side frame12. A direction in which the right impact absorption member17extends is along the longitudinal direction of the right front side frame12, and an axis line of the impact absorption member17is positioned on a forward extension line of the front side frame12. A front portion of the contactless charger4is positioned between the left and right impact absorption members16and17. Accordingly, because the contactless charger4can be arranged by using a space between the impact absorption members16and17which are compressed and deformed in a minor collision, it becomes possible to increase the size of contactless charger4, and a large-sized coil can easily be housed.

As illustrated inFIG.3,FIG.4and so forth, the front member18is a member which is suspended between the left and right impact absorption members16and17. A portion on a left side of a central portion of the front member18in the vehicle width direction is fixed to a front portion of the left impact absorption member16, and a portion on a right side of the central portion of the front member18in the vehicle width direction is fixed to a front portion of the right impact absorption member17. Accordingly, the left and right impact absorption members16and17are coupled together by the front member18. The front portion of the contactless charger4is positioned in the rear of the front member18.

As illustrated inFIG.1, positions, in the front-rear direction, of the front member18and of a front bumper reinforcement87of the upper structure3are set to generally the same positions, and the front member18is positioned directly below the front bumper reinforcement87.

(Working Effects of Embodiment)

As described above, the contactless charger4is arranged in the space C formed between the left and right front side frames11and12, that is, on a lower side of the vehicle-body front portion. Accordingly, how to secure the minimum ground clearance does not become a problem, and how to secure the departure angle does not become a problem either. The intermediate member portion15A of the first cross member15is also arranged in the space C, but because the intermediate member portion15A is arranged in the cross member arrangement portion4aof the contactless charger4, layout characteristics of the contactless charger4are improved.

Further, because a structure is made in which the cross member arrangement portion4ais open downward and the intermediate member portion15A is capable of being inserted from a portion below the cross member arrangement portion4a, the contactless charger4is not protruded downward in the vehicle-body front portion, and how to secure an approach angle does not become a problem.

Next, a description will be made about a collision of the electric vehicle1which is configured as described above. For example, in a case where a left side offset collision is presumed in which an impact load is input from obliquely left front, because the left front side frame11extends so as to correspond to an input direction of the impact load, the impact load from the obliquely left front is input generally along an axis direction of the left front side frame11, and the impact load is absorbed by the left front side frame11. In addition, the impact load input to the left front side frame11is transmitted to the front-side battery frame32and is thus also absorbed by the front-side battery frame32. In this case, because the left and right front side frames11and12are coupled together by the first cross member15, the front side frames11are less likely to collapse but are more likely to be axially compressed. The same applies to a right side offset collision.

Further, in a case where an impact load is input from front, because the second cross member19is positioned in the rear of the contactless charger4, the contactless charger4can be deformed or destroyed in front of the second cross member19. Accordingly, it becomes possible to absorb an impact by using the contactless charger4.

The above-described embodiment is merely an example in all respects and is not to be construed in a limited manner. Furthermore, all modifications and changes belonging to the equivalent scope of the claims are included in the scope of the present invention.

INDUSTRIAL APPLICABILITY

As described in the foregoing, a vehicle-body front structure according to the present disclosure can be provided to an electric vehicle, for example.

REFERENCE SIGNS LIST