JP2019188884A - Fuel cell vehicle - Google Patents

Abstract

To provide a fuel cell vehicle that is improved in vehicle behavior at the time when a vehicle is started and in load absorption at the time of an offset collision.SOLUTION: A fuel cell vehicle 10 includes: front side members 14A, 14B which are vehicle skeleton members extending in the vehicle longitudinal direction on both sides in the vehicle width direction in the front of the vehicle; under members 16A, 16B which are vehicle skeleton members extending in the vehicle longitudinal direction under the front side members 14A, 14B on both sides in the vehicle width direction in the front of the vehicle; and a drive unit 18 in which a fuel cell stack disposed in a power unit chamber in the front of the vehicle and a travel motor driven with the electric energy generated in the fuel cell stack are integrated with each other, and which is mounted to the front side members 14A, 14B and to the under members 16A, 16B via mounts 42A, 42B, 68A, 68B with vibration isolating devices 46 at both ends in the vehicle width direction, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel cell vehicle.

  Conventionally, in a fuel cell vehicle, it has been proposed that a fuel cell stack, a driving motor, a gear box, and the like are integrated (unit) and mounted in a power unit chamber in front of the vehicle (see Patent Document 1).

  In the example of the above document, a unit in which a fuel cell stack, a driving motor, a gear box, and the like are integrated is attached to left and right apron members via mount members at both ends of the unit in the vehicle width direction. It is attached to the lower surface of the floor panel via a mounting member on the vehicle rear side.

JP-A-2005-130545

  However, if the unit is supported at three points as in the above-mentioned document, the support balance on the vehicle body side when the driving torque of the traveling motor acts on the vehicle body is poor, and the torque steer at the time of vehicle start may deteriorate. there were.

  Further, when a load due to an inertial mass is input from the unit to the vehicle body during an offset collision or the like, the vehicle body may not be able to absorb the collision load firmly due to poor balance of the support position.

  That is, the fuel cell vehicle according to the prior art has room for improvement in terms of vehicle behavior when starting the vehicle and load absorption during offset collision.

  In view of the above facts, the present invention has an object to provide a fuel cell vehicle with improved vehicle behavior at the time of vehicle start and load absorption at the time of offset collision.

  The fuel cell vehicle according to the first aspect of the present invention includes a front side member that is a vehicle skeleton member extending in the vehicle longitudinal direction on both sides in the vehicle width direction in front of the vehicle, and the front side member on both sides in the vehicle width direction in front of the vehicle. An under member which is a vehicle skeleton member extending in the vehicle front-rear direction below the vehicle, a fuel cell stack disposed in a power unit chamber in front of the vehicle, and a travel motor driven by electric energy generated in the fuel cell stack , And drive units respectively attached to the front side member and the under member via elastic members at both ends in the vehicle width direction.

  In the fuel cell vehicle configured as described above, the drive unit in which the fuel cell stack and the traveling motor are integrated is provided on the front side member and the under member that extend in the vehicle longitudinal direction on both sides in the vehicle width direction in front of the vehicle. Each is attached via an elastic member. Since the under member is positioned below the front side member in the vehicle, the drive unit is supported at four points (up and down) and left and right and above in the front view of the vehicle. Further, the drive unit is supported at least at two upper and lower points in a side view of the vehicle. As described above, the drive unit is supported by the front side member and the under member, which are vehicle skeleton members, at four or more points on the top, bottom, left, and right, thereby stably supporting the drive unit on which the driving torque of the traveling motor acts. be able to. As a result, the vehicle behavior when the vehicle starts is improved.

  Further, even when a fuel cell vehicle has a front offset collision, the collision load input to one front side member or under member is transmitted to the other front side member or under member via the drive unit. In addition, the load transmitted from the drive unit to the vehicle body due to the inertial mass at the time of the front offset collision is also distributed and transmitted to the four front side members and under members of the top, bottom, left and right. Is suppressed from becoming locally large. As a result, the front side member and the under member can efficiently transmit the load caused by the collision to the rear side of the vehicle, and the absorption of the collision load by the vehicle body can be improved.

  Since the fuel cell vehicle according to the first aspect of the present invention has the above-described configuration, it is possible to improve vehicle behavior at the time of vehicle start and load absorption at the time of offset collision.

It is a perspective view which shows the principal part of the fuel cell vehicle which concerns on one Embodiment. It is the sectional view on the AA line of FIG. (A) is a longitudinal cross-sectional view which shows the mounting state with respect to the front side member of the drive unit which concerns on one Embodiment, (B) is a longitudinal cross-sectional view which shows the mounting state with respect to the under member of a drive unit, (C) is (C). It is a perspective view which shows the mounting state with respect to the front side member of a drive unit. It is side sectional drawing which shows the principal part of the fuel cell vehicle which concerns on one Embodiment.

[Embodiment]
A fuel cell vehicle according to an embodiment of the present invention will be described with reference to FIGS. In each figure, arrow FR indicates the front of the vehicle, arrow W indicates the vehicle width direction, and arrow UP indicates the upper side of the vehicle.

[Constitution]
As shown in FIG. 1, the fuel cell vehicle 10 includes front side members 14A and 14B extending in the vehicle front-rear direction on both sides in the vehicle width direction of the power unit chamber 12 in front of the vehicle, and below the front side members 14A and 14B. An under member 16A, 16B extending in the vehicle front-rear direction, a front side member 14A, 14B, and a drive unit 18 described later supported by the under member 16A, 16B are provided.

  Since the front side members 14A and 14B and the under members 16A and 16B are bilaterally symmetric, the left front side member 14A and the under member 16A will be described, and the description of the right front side member 14B and the under member 16B will be omitted.

  The front side member 14A has a kick portion 20A that extends toward the vehicle rear side at the vehicle rear side end portion, and a vehicle skeleton that extends from the rear end (lower end) of the kick portion 20A to the vehicle rear side. Connected to the member.

  The under member 16A extends in the vehicle front-rear direction below the front side member 14A and is connected to a front suspension member (hereinafter referred to as “front suspension”) 24 at the vehicle rear side end. The vehicle rear side end portion of the front suspension 24 is fastened to the lower end of the kick portion 20A via a fastener 26A. This fastening structure is a structure in which the front suspension 24 is detached from the front side member 14A when a collision load of a predetermined value or more due to a frontal collision of the vehicle is input to the front suspension 24 through the under members 16A and 16B. .

  On the other hand, the drive unit 18 includes a fuel cell stack 30 that generates electric energy from hydrogen and oxygen (air), a travel motor 32 that is driven by the electric energy generated in the fuel cell stack 30, and power generation of the fuel cell stack 30. The inverter 34 that converts electric power into alternating current is unitized at least integrally. The travel motor 32 is integrated with a transaxle.

  As shown in FIG. 1, a substantially rectangular mounting portion 33 is formed on the outer side (left side) of the upper portion of the traveling motor 32 in the vehicle width direction. As shown in FIG. 3 (A), the pin 40A protrudes from the vehicle width direction outer side end surface 33A of the mounting portion 33 to the vehicle width direction outer side. The pin 40A is supported by a mount 42A provided on the front side member 14A, whereby the drive unit 18 (traveling motor 32) is supported by the front side member 14A.

  As shown in FIGS. 3A and 3C, the mount 42 </ b> A includes a bracket 44 attached to the front side member 14 </ b> A and a vibration isolator 46 fitted in the hole 48 of the bracket 44. The vibration isolator 46 corresponds to an elastic member.

  The bracket 44 extends from the both ends of the substantially circular holding portion 50 and the holding portion 50 to the vehicle front side and the vehicle rear side, respectively, in a side view where the hole portion 48 into which the vibration isolator 46 is fitted is formed. It has flange portions 52A and 52B (see FIG. 3C). The mount 42A is attached to the front side member 14A with bolts 54 and nuts 55 (see FIG. 2) inserted through the flanges 52A, 52B and holes (not shown) provided in the front side member 14A.

  Further, the vibration isolator 46 includes an inner cylinder 56 into which the pin 40A is inserted, an outer cylinder 58 having a larger diameter than the inner cylinder 56, and a cylindrical shape fitted between the inner cylinder 56 and the outer cylinder 58. It consists of a vibration proof rubber 60. By attaching the bracket 44 in which the vibration isolator 46 having the pin 40A inserted into the inner cylinder 56 is fitted to the front side member 14A, the drive unit 18 (running) is connected via the pin 40A and the mount 42A (vibration isolator 46). Motor 32) is supported by the front side member 14A.

  A nut 62 is fastened to the pin 40A at both ends of the inner cylinder 56, and the pin 40A and the vibration isolator 46 are prevented from relatively moving in the axial direction.

  Further, as shown in FIGS. 2 and 3B, a recessed portion 64 that is recessed inward in the vehicle width direction is formed on the vehicle lower side of the vehicle width direction outer end surface 32A of the traveling motor 32. A pin 66A that protrudes outward in the vehicle width direction from the end surface 64A in the vehicle width direction of the recess 64 is supported by a mount 68A provided on the under member 16A. That is, the drive unit 18 (traveling motor 32) is attached (supported) to the under member 16A via the mount 68A. Since the mount 68A has the same configuration as that of the mount 42A, the same reference numerals as those of the mount 42A are attached to the same components as those of the mount 42A, and the detailed description thereof is omitted (see FIG. 3B).

  Further, on the opposite side of the drive unit 18 in the vehicle width direction, as shown in FIG. 2, a pin 40 </ b> B that protrudes outward in the vehicle width direction from the vehicle width direction outer end surface 30 </ b> A of the fuel cell stack 30 is provided on the front side member. The drive unit 18 (fuel cell stack 30) is supported by the front side member 14B by being supported by the mount 42B provided on the 14B.

  Further, as shown in FIG. 2, a recess 64 that is recessed inward in the vehicle width direction is formed on the vehicle lower side of the vehicle width direction outer end surface 30 </ b> A of the fuel cell stack 30. The drive unit 18 (fuel cell stack 30) is supported by the under member 16B by supporting the pin 66B disposed so as to protrude outward in the vehicle width direction from the end surface 64B by the mount 68B provided on the under member 16B. ing.

  Since the mounts 42B and 68B are symmetrical and have the same structure as the mounts 42A and 68BA, detailed descriptions thereof are omitted.

[Action]
The operation of the fuel cell vehicle 10 configured as described above will be described.

  In the fuel cell vehicle 10, both ends of the drive unit 18 in the vehicle width direction are supported by the left and right front side members 14A and 14B via mounts 42A and 42B, and the left and right under members 16A via mounts 68A and 68B. , 16B.

  That is, the drive unit 18 is supported by the left and right front side members 14A and 14B and the under members 16A and 16B, which are vehicle skeleton members, at the top and bottom of both ends in the vehicle width direction.

  Accordingly, the fuel cell stack 30, the driving motor 32, the inverter 34, and the like are integrated, and the drive unit 18 having a large mass is supported at the upper and lower portions at both ends in the vehicle width direction, so that it can be stably held by the vehicle body. become.

  For example, even if a driving torque is applied from the traveling motor 32 and a pitching moment (a moment with the vehicle width direction as a rotation axis) is applied to the drive unit 18, the top and bottom two points (see FIG. 4) in the vehicle side view. Since it is supported via the mount 42A (42B) and the mount 68A (68B), it is supported stably. Further, since the drive unit 18 is supported via mounts 42A, 42B, 68A, and 68B at four points on the left and right ends in the front view of the vehicle (see FIG. 2), Alternatively, the drive unit 18 can be stably supported even when a rowing moment (moment with the vehicle longitudinal direction as the rotation axis) is applied. That is, the drive unit 18 is stably supported by the vehicle body not only with respect to the driving torque of the traveling motor 32 but also with respect to vibration input from the road surface.

  Further, when the fuel cell automobile 10 has a front offset collision, for example, a collision load directed toward the rear of the vehicle is input to the front side member 14A and the under member 16A from the front end portion. At this time, part of the collision load input to the front side member 14A and the under member 16A is transmitted to the drive unit 18 via the mounts 42A and 68A, and the front side member 14B on the opposite side via the mounts 42B and 68B. , Is transmitted to the under member 16B.

  Further, when the load due to the inertial mass of the drive unit 18 is transmitted to the vehicle body side due to the front surface offset collision of the fuel cell vehicle 10, the front side members 14A, 14B and the underside are also connected via the mounts 42A, 42B, 68A, 68B. Since the transmission is distributed to the members 16A and 16B, load input to the front side member 14A and the under member 16A is suppressed.

  As a result, the load input to the undermember 16A on the collision side at the time of the front offset collision is suppressed, and buckling of the undermember 16A is prevented or suppressed. As a result, the collision load can be efficiently transmitted from the under member 16A to the front suspension 24.

  As described above, the collision load is efficiently transmitted from the under members 16A and 16B to the front suspension 24, so that the coupling portion (fastener 26A and the like) of the front suspension 24 to the front side member 14A (kick portion 20A). ) Is broken, and the front suspension 24 is detached from the kick portion 20A of the front side member 14A. This prevents the front suspension 24 from falling and the drive unit 18 from entering the vehicle compartment.

  As described above, in the fuel cell vehicle 10, the drive unit 18 is mounted on the upper and lower ends of both ends in the vehicle width direction via the mounts 42A, 42B, 68A, 68B, and the front side members 14A, 14B and under members 16A, 16B of the vehicle skeleton members. Therefore, even if a pitching moment due to the driving rotation of the traveling motor 32 is applied, it can be stably supported. In addition, vibrations in the vertical and horizontal directions due to road surface input can be absorbed well, and even when a rowing moment acts on the drive unit 18, it can be absorbed well.

  Further, in the fuel cell vehicle 10, even when a collision load is input only to the front side member 14 </ b> A and the under member 16 </ b> A due to a front offset collision, for example, the other front side member 14 </ b> B and the under member 16 </ b> B are connected via the drive unit 18. In addition, the impact load can be distributed to the front side members 14A and 14B and the under members 16A and 16B. As a result, in the fuel cell vehicle 10, the buckling of the under member 16A to which the collision load is input at the time of the front offset collision is prevented or suppressed, and the collision load is applied to the front suspension 24 disposed on the vehicle rear side of the under member 16A. Can be transmitted well. As a result, the fasteners 26A and the like having a detaching structure are destroyed, the front suspension 24 is detached from the front side member 14A (kick portion 20A and the like), and the drive unit 18 is prevented or suppressed from entering the vehicle compartment side. Is done.

[Others]
In the above embodiment, the drive unit 18 is supported at the four points of the front side members 14A and 14B and the under members 16A and 16B. However, the drive unit 18 is supported at other positions to support the drive unit 18 at five or more points. 18 may be configured to be supported.

  Further, in the above embodiment, the mounts 42A and 42B and the mounts 68A and 68B support the drive unit 18 in the same position in the vehicle front-rear direction, but may be offset in the vehicle front-rear direction.

  Further, in the above embodiment, the fuel cell stack 30 and the travel motor 32 that constitute the drive unit 18 are arranged on the left and right in the vehicle front view, but may be arranged on the top and bottom.

DESCRIPTION OF SYMBOLS 10 Fuel cell vehicle 12 Power unit chamber 14A, 14B Front side member 16A, 16B Under member 18 Drive unit 30 Fuel cell stack 32 Driving motor 46 Vibration isolator (elastic member)

Claims (1)

A front side member that is a vehicle skeleton member extending in the vehicle longitudinal direction on both sides in the vehicle width direction in front of the vehicle;
An under member that is a vehicle skeleton member that extends in the vehicle front-rear direction below the front side member on both sides in the vehicle width direction in front of the vehicle;
A fuel cell stack disposed in a power unit chamber in front of the vehicle and a driving motor driven by electric energy generated in the fuel cell stack are integrated, and the front side member and the under are at both ends in the vehicle width direction. A drive unit attached to each member via an elastic member;
A fuel cell vehicle comprising: