Electrified vehicle

An electrified vehicle includes a floor panel, a battery case, a frame that that supports a suspension, and a brace. The brace is fixed to the frame by a first fixing portion situated on a right side of the vehicle with respect to a middle line. The brace is fixed to the frame by a second fixing portion situated on a left side of the vehicle with respect to the middle line. The brace is fixed to the battery case by a third fixing portion situated on the right side of the vehicle with respect to the middle line. The brace is fixed to the battery case by a fourth fixing portion situated on the left side of the vehicle with respect to the middle line. The brace includes a first plate and a second plate which is fixed to the first plate and covers a recessed portion.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Japanese Patent Application No. 2021-064928 filed on Apr. 6, 2021, incorporated herein by reference in its entirety.

BACKGROUND

1. Technical Field

The technology disclosed in the present specification relates to an electrified vehicle. Note that in the present specification, the term “electrified vehicle” means a vehicle that travels by using electric power stored in a battery. Electrified vehicles include hybrid electric vehicles that travel by using electricity and fuel.

2. Description of Related Art

An electrified vehicle disclosed in Japanese Unexamined Patent Application Publication No. 2019-010999 (JP 2019-010999 A) has a battery case that is disposed on a lower side of a floor panel. In this electrified vehicle, a frame supporting a front-side suspension (i.e., a suspension member) and the battery case are connected by two connecting members (i.e., suspension siderail rears). One connecting member is disposed to a right side of a middle in a vehicle-width direction. The other connecting member is disposed to a left side of the middle in the vehicle-width direction. According to this configuration, a load applied to a body when the vehicle encounters a collision can be conveyed to the battery case, and accordingly the load applied to the body can be reduced.

SUMMARY

In the vehicle according to JP 2019-010999 A, the right and left connecting members are separated. Accordingly, when the vehicle encounters a collision on either the right or left side, the load is not applied to the connecting member situated on the opposite side from the portion involved in the collision, and the load cannot be sufficiently conveyed to the battery case. For example, when the collision of the vehicle occurs at the right side thereof, a load is applied to the right-side portion of the battery case through the connecting member on the right side. However, in this case, the load is not readily applied to the connection member on the left side, and the load is not readily conveyed to the left side portion of the battery case. Thus, when the connecting member connecting the frame and the battery case is separated on the right and left, a problem occurs in which the battery case cannot properly bear the load when a collision occurs on one of the right and left sides. Note that while JP 2019-010999 A discloses connecting members connecting the battery case and the frame on a front side thereof, the same problem occurs regarding connecting members connecting the battery case and the frame on a rear side thereof.

In order to solve this problem, the frame and the battery case can be connected by a plate-shaped connecting member extending across both sides of the middle in the vehicle-width direction. According to this configuration, the load in a collision that is biased to one of the right and the left can be conveyed to both the right side portion and the left side portion of the battery case. However, when the frame and the battery case are connected by the plate-shaped connecting member, securing sufficient strength to serve as a connecting member is difficult. Accordingly, when the vehicle collides, the connecting member is readily deformed and the load is not readily conveyed to the battery case.

In the present specification, there is proposed a technology regrading a vehicle having a connecting member for connecting the frame and the battery case, in which sufficient strength is secured to serve as the connecting member, and a load at the time of a collision that is biased to the right or the left can be conveyed to both the right-side portion and the left-side portion of the battery case.

An aspect of the present disclosure relates to an electrified vehicle. The electrified vehicle includes a floor panel, a battery case, a frame and a brace. The battery case is disposed on a lower side of the floor panel, and accommodates a battery. The frame is disposed in a vehicle forward side or a vehicle rearward side of the battery case and supports a suspension. The brace intersects an imaginary middle line orthogonal to a vehicle-width direction of the electrified vehicle, and is fixed to the frame and the battery case. The brace is fixed to the frame by a first fixing portion situated on a right side of the electrified vehicle with respect to the middle line. The brace is fixed to the frame by a second fixing portion situated on a left side of the electrified vehicle with respect to the middle line. The brace is fixed to the battery case by a third fixing portion situated on the right side of the electrified vehicle with respect to the middle line. The brace is fixed to the battery case by a fourth fixing portion situated on the left side of the electrified vehicle with respect to the middle line. The brace includes a first plate member and a second plate member. The first plate member includes a first bead that is situated on the right side of the electrified vehicle with respect to the middle line and that extends in a front-rear direction, and a second bead that is located on the left side of the electrified vehicle with respect to the middle line and that extends in the front-rear direction. The second plate member is fixed to the first plate member, being stacked with the first plate member, and covers a first recessed portion configured of the first bead on a surface of the first plate member and a second recessed portion configured of the second bead on the surface of the first plate member.

In this electrified vehicle, a connecting member connecting a frame and a battery case is configured of a brace. The brace extends across both sides of a middle in a vehicle-width direction of the electrified vehicle and is connected to the frame and the battery case on each of the right and left sides of the middle. That is to say, the connecting member is configured of the brace connected from the right side to the left side of the vehicle. Accordingly, a load in a collision that is biased to one of the right and the left can be conveyed to both the right-side portion and the left-side portion of the battery case. The brace also includes a first plate member and a second plate member. The first plate member includes a first bead and a second bead extending in a front-rear direction, and the second plate member covers recessed portions configured by the beads. Accordingly, the brace is configured with a structure in which a tubular portion configured of the first bead and the second plate member, and a tubular portion configured of the second bead and the second plate member, extend in the front-rear direction. The brace is imparted with great strength according to this structure. Accordingly, the brace enables the load to be appropriately conveyed from the frame to the battery case.

DETAILED DESCRIPTION OF EMBODIMENTS

An example of an electrified vehicle disclosed in the present specification may further include a first bolt that fixes a brace to a frame at a first fixing portion, a second bolt that fixes the brace to the frame at a second fixing portion, a third bolt that fixes the brace to a battery case at a third fixing portion, and a fourth bolt that fixes the brace to the battery case at a fourth fixing portion.

According to this configuration, the brace can be removed from the frame and the battery case by removing the first bolt, the second bolt, the third bolt, and the fourth bolt. This improves ease of maintenance of the electrified vehicle.

In an example of the electrified vehicle disclosed in the present specification, the brace may be fixed to the battery case at a fifth fixing portion situated on a right side with respect to a middle and situated rearward of the third fixing portion, and the brace may be fixed to the battery case at a sixth fixing portion situated on a left side with respect to the middle and situated rearward of the fourth fixing portion.

According to this configuration, the brace reinforces a front portion of the battery case and suppresses deformation of the battery case.

In an example of the electrified vehicle disclosed in the present specification, a coolant pipe that extends in a vehicle-width direction may be provided within the battery case. The coolant pipe may be disposed in at least one of between the third fixing portion and the fifth fixing portion and between the fourth fixing portion and the sixth fixing portion, in plan view of the battery case from below.

According to this configuration, damage to the coolant pipe can be suppressed.

In an example of the electrified vehicle disclosed in the present specification, a first bead may extend from the first fixing portion to the third fixing portion, and a second bead may extend from the second fixing portion to the fourth fixing portion.

According to this configuration, the strength of the brace is further improved.

In an example of the electrified vehicle disclosed in the present specification, a first recessed portion and a second recessed portion may be provided on a lower face of a first plate member. A second plate member may be disposed on a lower side of the first plate member. The first bead may include a front-side portion that extends further to a front side than the second plate member, and a rear-side portion that extends further rearward than the second plate member. The second bead may include a front-side portion that extends further to the front side than the second plate member, and a rear-side portion that extends further rearward than the second plate member. The first fixing portion may be provided on the front-side portion of the first bead. The second fixing portion may be provided on the front-side portion of the second bead. The third fixing portion may be provided on the rear-side portion of the first bead. The fourth fixing portion may be provided on the rear-side portion of the second bead.

According to this configuration, the brace can be appropriately fixed at each fixing portion.

In an example of the electrified vehicle disclosed in the present specification, the brace may further include a lateral bead extending along the vehicle-width direction, at which lateral bead an upper face of the brace protrudes. The vehicle may include a discharge portion that discharges foreign matter that enters a space between the brace and the battery case to outside of the space. A width of a gap between the lateral bead and the battery case may be narrower than a width of the discharge portion.

According to this configuration, the lateral bead can suppress foreign matter (e.g., stones or the like) from entering the space between the brace and the battery case. Also, even when foreign matter does enter the space, the foreign matter can be discharged from the discharging portion.

FIG.1illustrates an electrified vehicle10according to an embodiment. Note that in the drawings, forward of the vehicle is indicated by arrow FR, upward of the vehicle is indicated by arrow UP, and rightward of the vehicle is indicated by arrow RH. The electrified vehicle10has a battery case20and a frame30. As illustrated inFIG.2, the battery case20is disposed on a lower side of a floor panel40. The floor panel40is a plate-shaped member making up a floor of a cabin of the electrified vehicle10. The battery case20accommodates a battery22. The electrified vehicle10has a traction motor, although omitted from illustration. By supplying electric power from the battery22to the traction motor, the traction motor is driven and the electrified vehicle10travels. As illustrated inFIG.1, the frame30is disposed forward of the battery case20. The frame30is disposed in a front compartment of the electrified vehicle10. The frame30is disposed at substantially the same height as the battery case20. The frame30is fixed to a body of the electrified vehicle10. A front suspension (omitted from illustration) is connected to the frame30. The frame30supports the front suspension. The frame30may be referred to as a “front suspension member”.

As illustrated inFIG.3, the frame30has two siderails32and34extending in a front-rear direction, and two cross members36and38extending in a vehicle-width direction (i.e., a right-left direction of the electrified vehicle10). The siderails32and34are disposed across a spacing in the vehicle-width direction. In some of the drawings, includingFIG.3, a long dashed short dashed line indicates the middle C1of the electrified vehicle10in the vehicle-width direction. The siderail32is disposed on the left side of the middle C1, and the siderail34is disposed on the right side of the middle C1. The cross member36connects a front end of the siderail32and a front end of the siderail34. The cross member38connects the siderail32and the siderail34rearward from the cross member36. The front suspension is attached to the siderails32and34.

As illustrated inFIG.4, the electrified vehicle10has a brace50. The brace50connects the frame30and the battery case20. As illustrated inFIGS.5and6, the brace50is a plate-shaped member. The brace50has a first plate member51and a second plate member52. Each of the first plate member51and the second plate member52is a metal plate member formed by stamping.

As illustrated inFIG.5, the first plate member51extends across both sides of the middle C1of the electrified vehicle10. Four beads61to64extending along the front-rear direction are formed on the first plate member51. Each of the beads61to64is configured of a curved portion of the first plate member51. As illustrated inFIG.7, in each range of the beads61to64, a protruding portion is formed on an upper face of the first plate member51, and a recessed portion is formed on a lower face of the first plate member51. As illustrated inFIGS.5and6, the beads61and62are disposed on the left side of the middle C1of the electrified vehicle10, and the beads63and64are disposed on the right side of the middle C1of the electrified vehicle10. Attaching holes61aand61bare provided at a front end of the bead61. An attaching hole61cis provided at a rear end of the bead61. The bead61extends from the attaching holes61aand61bto the attaching hole61c. An attaching hole62ais provided at a front end of the bead62. An attaching hole62cis provided at a rear end of the bead62. An attaching hole62bis provided at a position between the attaching hole62aand the attaching hole62cin the bead62. The bead62extends from the attaching hole62ato the attaching hole62cvia the attaching hole62b. An attaching hole63ais provided at a front end of the bead63. An attaching hole63cis provided at a rear end of the bead63. An attaching hole63bis provided at a position between the attaching hole63aand the attaching hole63cin the bead63. The bead63extends from the attaching hole63ato the attaching hole63cvia the attaching hole63b. Attaching holes64aand64bare provided at a front end of the bead64. An attaching hole64cis provided at a rear end of the bead64. The bead64extends from the attaching holes64aand64bto the attaching hole64c. At a forward portion of the brace50, a spaced portion65is provided between the bead62and the bead63. Rearward of the spaced portion65is provided a plate-shaped portion66connecting the bead62and the bead63. A lateral bead68extending in the vehicle-width direction is formed on the plate-shaped portion66. The lateral bead68is configured of a curved portion of the plate-shaped portion66. Within the range of the lateral bead68, a protruding portion is formed on an upper face of the plate-shaped portion66, and a recessed portion is formed on a lower face of the plate-shaped portion66. The lateral bead68extends from the bead62to the bead63. Also, two discharge holes80are formed in the plate-shaped portion66. The discharge holes80are disposed rearward from the lateral bead68.

As illustrated inFIGS.5and6, the second plate member52extends across both sides of the middle C1of the electrified vehicle10. The second plate member52is disposed below the first plate member51, and is welded to the first plate member51. That is to say, the second plate member52is fixed to the first plate member51in a state in which an upper face of the second plate member52is in contact with the lower face of the first plate member51. The second plate member52partially closes off the spaced portion65of the first plate member51. As illustrated inFIG.8, in a range over which the second plate member52covers the lower face of the first plate member51, the second plate member52extends from the bead61to the bead64. The second plate member52covers recessed portions (recessed portions formed on the lower face of the first plate member51) configured by the beads61to64. Each of the beads61to64and the second plate member52configure a tubular portion having a closed cross-section. Each tubular portion extends along the front-rear direction of the electrified vehicle10. Thus, the strength of the brace50is improved by the brace50having the tubular portions on both sides of the middle C1, extending along the front-rear direction. As illustrated inFIGS.5and6, the beads61to64extend further forward beyond the second plate member52. As illustrated inFIG.7, at positions forward from the second plate member52, the recessed portions configured by the beads61to64are not covered by the second plate member52. That is to say, at the positions forward from the second plate member52, the recessed portions configured by the beads61to64are open. As illustrated inFIGS.5and6, the attaching holes61a,61b,62a,63a,64a, and64bare disposed in portions of the beads61to64forward from the second plate member52. The beads61to64extend further rearward beyond the second plate member52. At positions rearward from the second plate member52, the recessed portions configured by the beads61to64are not covered by the second plate member52. That is to say, at the positions rearward from the second plate member52, the recessed portions configured by the beads61to64are open. The attaching holes61c,62b,62c,63b,63c, and64care disposed in portions of the beads61to64rearward from the second plate member52.

As illustrated inFIG.3, the siderail32is provided with attaching holes71aand71b. An attaching hole72ais provided at a left end of the cross member38. An attaching hole73ais provided at a right end of the cross member38. The siderail34is provided with attaching holes74aand74b. Attaching holes71c,72b,73b, and74care provided at a front end of a lower face of the battery case20. The attaching holes71cand72bare disposed on the left side of the middle C1. The attaching hole72bis disposed between the attaching hole71cand the middle C1. The attaching holes73band74care disposed on the right side of the middle C1. The attaching hole73bis disposed between the attaching hole74cand the middle C1. An attaching hole72cis provided on the lower face of the battery case20, at a position rearward from the attaching hole72b. An attaching hole73cis provided on the lower face of the battery case20, at a position rearward from the attaching hole73b.

As illustrated inFIG.4, the brace50is fixed to the frame30and the battery case20. More specifically, the brace50is fixed to the attaching holes71aand71bof the siderail32by bolts and nuts, by the attaching holes61aand61bsituated on the left side from the middle C1. Also, the brace50is fixed to the attaching hole71cof the battery case20by a bolt and a nut, by the attaching hole61csituated on the left side from the middle C1. The brace50is also fixed to the attaching hole72aof the cross member38by a bolt and a nut, by the attaching hole62asituated on the left side from the middle C1. The brace50is also fixed to the attaching hole72bof the battery case20by a bolt and a nut, by the attaching hole62bsituated on the left side from the middle C1. The brace50is also fixed to the attaching hole72cof the battery case20by a bolt and a nut, by the attaching hole62csituated on the left side from the middle C1. The brace50is also fixed to the attaching hole73aof the cross member38by a bolt and a nut, by the attaching hole63asituated on the right side from the middle C1. The brace50is also fixed to the attaching hole73bof the battery case20by a bolt and a nut, by the attaching hole63bsituated on the right side from the middle C1. The brace50is also fixed to the attaching hole73cof the battery case20by a bolt and a nut, by the attaching hole63csituated on the right side from the middle C1. Also, the brace50is fixed to the attaching holes74aand74bof the siderail34by bolts and nuts, by the attaching holes64aand64bsituated on the right side from the middle C1. The brace50is also fixed to the attaching hole74cof the battery case20by a bolt and a nut, by the attaching hole64csituated on the right side from the middle C1. Note that the beads61to64have shapes that protrude upward, and accordingly the beads61to64can be in close contact with the frame30situated on the upper sides of the beads61to64. Further, the recessed portions configured by the beads61to64are not covered by the second plate member52at the positions of the attaching holes61a,61b,62a,63a,64a, and64b, and accordingly bolting can be suitably performed at the attaching holes61a,61b,62a,63a,64a, and64b. Thus, the brace50can be suitably fixed to the frame30. Also, the beads61to64have shapes that protrude upward, and accordingly the beads61to64can be in close contact with the battery case20situated on the upper side of the beads61to64. Further, the recessed portions formed by the beads61to64are not covered by the second plate member52at the positions of the attaching holes61c,62b,62c,63b,63c, and64c, and accordingly bolting can be suitably performed at the attaching holes61c,62b,62c,63b,63c, and64c. Accordingly, the brace50can be suitably fixed to the battery case20. Thus, the brace50connects the frame30and the battery case20. In a state in which the brace50is attached to the battery case20, the lateral bead68is disposed at a position facing a front end20fof the battery case20, as illustrated inFIG.9. The lateral bead68extends along the front end20fof the battery case20. Further, the discharge holes80are disposed on the lower side of the battery case20.

As illustrated inFIGS.3and4, coolant pipes96and98for circulating coolant are provided inside the battery case20. The coolant flows from the coolant pipe96to the coolant pipe98via a branch flow path (omitted from illustration). The battery22in the battery case20is cooled by the coolant flowing in this way. When the battery case20is viewed from below in plan view, the coolant pipe96passes between the attaching hole62band the attaching hole62c, and the coolant pipe98passes between the attaching hole63band the attaching hole63c.

When the electrified vehicle10encounters a frontal collision, a load is applied to the frame30. The load applied to the frame30travels to the battery case20via the brace50. As described above, the first plate member51has the beads61to64extending in the front-rear direction on both sides of the middle C1, and the second plate member52closes off the recessed portions of the beads61to64. Thus, the tubular portions extending in the front-rear direction are formed in the brace50. Accordingly, the brace50has high strength against loads applied from the frame30, and the loads are readily conveyed from the frame30to the battery case20via the brace50. In particular, in the present embodiment, each of the beads61to64extends from the fixing portions to the frame30(i.e., the attaching holes61a,61b,62a,63a,64a,64b) to the fixing portions to the battery case20(i.e., the attaching holes61c,62b,62c,63b,63c,64c). Accordingly, the brace50has higher strength against the load applied from the frame30, and the load can be conveyed from the frame30to the battery case20more effectively via the beads61to64. Conveying the collision load to the battery case20in this way reduces the load applied to the body of the electrified vehicle10.

Further, when the load applied to the brace50exceeds a predetermined value, the brace50bends at a position between the frame30and the battery case20, as illustrated inFIG.10. Accordingly, an excessively high load is suppressed from being applied to the battery case20, and deformation of the battery case20is suppressed. In particular, the first plate member51of the brace50is fixed to the battery case20by two attaching holes62band62cdisposed on the left side of the middle C1with spacing therebetween in the front-rear direction, and the attaching holes62band62care connected through the bead62. Also, the first plate member51of the brace50is fixed to the battery case20by two attaching holes63band63cdisposed on the right side of the middle C1with spacing therebetween in the front-rear direction, and the attaching holes63band63care connected through the bead63. This structure reinforces the front-side portion of the battery case20(i.e., the portion between the attaching holes62band63band the attaching holes62cand63c). Thus, deformation of the battery case20is suppressed more effectively, as illustrated inFIG.10. Also, as illustrated inFIG.4, the coolant pipe96passes between the attaching hole62band the attaching hole62c. That is to say, the coolant pipe96is disposed in the region of the battery case20reinforced by the brace50. Also, the coolant pipe98passes between the attaching hole63band the attaching hole63c. That is to say, the coolant pipe98is disposed in the region of the battery case20reinforced by the brace50. Accordingly, the coolant pipes96and98are less readily damaged in a collision of the electrified vehicle10.

Further, the brace50is a plate-shaped member in which the first plate member51and the second plate member52are joined together, and the brace50is fixed to the frame30and the battery case20on both sides of the middle C1, and accordingly the brace50can effectively convey the collision load to the battery case20even in the event of the electrified vehicle10encountering a collision on one side (e.g., the right or left side) from ahead. For example, when the electrified vehicle10encounters a collision at the forward right side, a load is applied from the siderail34of the frame30to the right side portion of the battery case20(i.e., the portion to the right side of the middle C1) via the beads63and64of the brace50. Also, the beads63and64are connected to the beads61and62by the plate-shaped portion66of the first plate member51and the second plate member52. Accordingly, the load is readily applied from the beads63and64to the beads61and62. The load applied to the beads61and62is conveyed to the left side portion of the battery case20(i.e., the portion on the left side of the middle C1). Thus, even when the electrified vehicle10encounters a collision at the forward right side, the load can be effectively conveyed to the right side portion and the left side portion of the battery case20by the brace50. Also, when the electrified vehicle10encounters a collision at the forward left side, the load can be effectively conveyed to the right side portion and the left side portion of the battery case20by the brace50in the same way. Therefore, the load applied to the body of the electrified vehicle10is reduced even when the collision is on one side of the vehicle.

Also, as illustrated inFIG.9, the brace50is provided with the lateral bead68, and accordingly a width W1of a gap90between the lateral bead68and the battery case20is narrowed. This suppresses foreign matter (e.g., stones or the like) from entering a space92between the brace50and the battery case20when the electrified vehicle10is traveling. Also, the first plate member51of the brace50is provided with the discharge holes80. A diameter R1of the discharge holes80is larger than the width W1of the gap90. Accordingly, even when foreign matter does enter the space92through the gap90, the foreign matter can be discharged downward through the discharge holes80. Further, a width W2of a gap94between the rear end of the brace50and the battery case20is wider than the width W1of the gap90. Accordingly, even when foreign matter does enter the space92through the gap90, the foreign matter can be discharged rearward from the gap94. Thus, in the electrified vehicle10according to the embodiment, the lateral bead68suppresses entry of foreign matter into the space92between the brace50and the battery case20, and even when the foreign matter does enter the space92, the foreign matter can be externally discharged from the space92through the discharge holes80and the gap94.

Also, in the electrified vehicle10, the brace50is fixed to the frame30and the battery case20by bolting. Accordingly, the brace50can be removed from the frame30and the battery case20at the time of maintenance. Thus, the ease of maintenance of the frame30and the battery case20is high. For example, the battery case20can be replaced when the capacity of the battery22decreases due to deterioration over time.

In the electrified vehicle according to the above-described embodiment, the first plate member is provided with beads that protrude upward, and the second plate member covers the recessed portion on the lower face of the first plate member (i.e., the bead). Alternatively, the first plate member may be provided with beads that are recessed downward, and the second plate member may cover the recessed portion on the upper face of the first plate member (that is, the bead).

Further, while the battery case and the frame disposed on the front side of the battery case (that is, the frame supporting the front suspension) are connected by the brace in the electrified vehicle according to the above-described embodiment, the battery case and a frame disposed on the rear side of the battery case (i.e., a frame supporting a rear suspension) may be connected by a brace. The technology disclosed in the present specification can be applied in this case as well.

The attaching holes63a,64a, and64baccording to the embodiment are an example of a first fixing portion. The attaching holes61a,61b, and62aaccording to the embodiment are an example of a second fixing portion. The attaching holes63band64caccording to the embodiment are an example of a third fixing portion. The attaching holes61cand62baccording to the embodiment are an example of a fourth fixing portion. The attaching hole63caccording to the embodiment is an example of a fifth fixing portion. The attaching hole62caccording to the embodiment is an example of a sixth fixing portion. The beads63and64according to the embodiment are an example of a first bead. The beads61and62according to the embodiment are an example of a second bead. The bolts fastened to the attaching holes63a,64a, and64baccording to the embodiment are an example of a first bolt. The bolts fastened to the attaching holes61a,61b, and62aaccording to the embodiment are an example of a second bolt. The bolts fastened to the attaching holes63band64caccording to the embodiment are an example of a third bolt. The bolts fastened to the attaching holes61cand62baccording to the embodiment are an example of a fourth bolt.

Although an embodiment is described in detail above, this is merely exemplary and is not intended to limit the scope of the claims. The technology described in the claims includes various modifications and alterations of the specific examples exemplified above. The technical elements described in the present specification and the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Also, the technology exemplified in the present specification and the drawings achieve a plurality of objects at the same time, and achieving one of the objects itself has technological utility.