JP6623739B2 - Under-floor structure of vehicle - Google Patents

Description

  The present disclosure relates to an underfloor structure of a vehicle such as an electric vehicle or a hybrid vehicle in which a battery case is mounted under the floor of a vehicle body.

An electric vehicle such as an electric vehicle or a hybrid vehicle has a running battery mounted as a battery pack, and runs by driving an electric motor with electric power supplied from the battery pack. The battery pack has a traveling battery and a battery case that houses the traveling battery.
The battery case is usually arranged under the floor of the vehicle body, and is located lower than the front suspension and the cross member.
The battery case is provided with a cooling device such as an evaporator for cooling the running battery.

Patent Document 1 discloses a configuration in which an evaporator is provided inside a tray, and a refrigerant pipe is guided to the evaporator via a connector provided on an outer surface of the tray. Further, there is disclosed a configuration in which a protector is disposed so as to cover a front of the vehicle body of a refrigerant pipe disposed in front of the vehicle body of the tray.
In Patent Document 1, the evaporator is provided inside the tray, but the evaporator and the refrigerant pipe may be arranged outside the battery case in order to avoid leakage of the refrigerant in the battery case.

JP 2014-104842 A

When an object to be fixed such as an evaporator is installed outside the battery case, the underfloor structure 100 of the conventional vehicle is, for example, as shown in FIG. From the outside. The head flange portion 104a of the fixed object 104 is disposed inside the tray 102, and the head flange portion 104a is fixed to the inner surface of the tray 102 via an airtight holder (for example, a rubber O-ring) 106. . By keeping the space between the head flange portion 104a and the tray 102 confidential, it is possible to prevent water and foreign substances from flowing into the tray. When the fixed object 104 is an evaporator, a refrigerant pipe 105 for supplying and discharging a refrigerant to and from the evaporator is connected.
7, the arrow a indicates the front direction of the vehicle body, and the line H indicates the lower surface height of the front suspension and the cross member. As shown in FIG. 7, a protector 108 for protecting the fixed object 104 may be provided at a position in front of the fixed object 104 in the vehicle body.

During traveling of the vehicle, the lower surface of the tray 102 is located below the lower surfaces of the front suspension and the cross member. Therefore, when there is an obstacle o on the road, the obstacle o does not interfere with the front suspension and the cross member. It may interfere with the tray 102 or the protector 108.
As shown in FIG. 8, when the obstacle o interferes with the tray 102 and the protector 108, the tray 102 and the protector 108 are pushed up by the obstacle o as shown in the drawing, and the periphery of the hole 102a of the tray 102 is deformed. Then, the wall surface of the tray 102 separates from the O-ring 106.
Therefore, the confidentiality inside the tray is not maintained, and water or foreign matter such as rainwater or jumping water may enter the tray through the generated gap, and may accumulate in the tray. If the amount of stored water or foreign matter accumulated in the tray exceeds a certain amount, the battery may be hindered.

  In view of these technical problems, at least one embodiment of the present invention relates to a case where an object to be fixed is protruded from a hole formed in a tray of a battery case for housing a battery and the tray interferes with an obstacle. Even so, the purpose is to be able to maintain the confidentiality of the tray.

(1) An under-floor structure of a vehicle according to some embodiments of the present invention is an under-floor structure of a vehicle having a battery case below the floor of a vehicle body. An object to be fixed to the tray while projecting outward, a fixing portion fixed to the tray around the hole from outside the tray, and a lower end portion of the fixing portion are integrally formed. A tray deformation comprising a contact portion which is led out of the fixed portion below the fixed object and toward the front of the vehicle body, and comes into contact with the obstacle and receives an upward load from the obstacle. A restraining member; and an airtight holding device interposed between the fixed object and the tray so as to surround the hole.
According to the configuration of the above (1), when the contact portion of the tray deformation suppressing member comes into contact with the obstacle and an upward load is applied, the force of the fixed portion at the boundary with the contact portion is centered. A moment is applied. This moment of force is applied to the periphery of the hole of the tray in a direction opposite to the direction away from the airtight holder, and acts to push the periphery of the hole of the tray toward the airtight holder.
As a result, the confidentiality inside the tray can be maintained, and intrusion of water or the like can be suppressed.

  In addition, it is desirable that the contact portion is configured such that when the contact portion comes into contact with the obstacle, the obstacle is guided along the lower surface of the contact portion. Thus, an upward load can be reliably applied to the contact portion. In addition, by placing obstacles along the lower surface of the contact portion, the contact portion is deformed to guide the obstacle to the lower surface of the tray, and a load is generated to lift the tray upward through the contact portion. The load received from the obstacle can be reduced, and the deformation of the tray can be suppressed.

(2) In some embodiments, in the configuration of (1), the tip of the contact portion is bent upward in an arc shape.
According to the configuration (2), when the contact portion comes into contact with the obstacle, the obstacle can be made to follow the lower surface of the contact portion along the arc shape of the distal end portion. Thus, an upward load can be reliably applied to the contact portion.

(3) In some embodiments, in the configuration of the above (1), the tip of the contact portion has a cylindrical cross section.
According to the configuration of (3), when the contact portion comes into contact with the obstacle, the obstacle can be made to follow the lower surface of the contact portion along the cylindrical cross section formed at the distal end portion. Thus, an upward load can be reliably applied to the contact portion.

(4) In some embodiments, in the configuration of (1), a roller is provided at a tip portion of the contact portion.
According to the configuration of (4), when the contact portion comes into contact with the obstacle, the obstacle is provided at the tip portion and guided by the roller, so that the obstacle can be made to follow the lower surface of the contact portion. Thus, an upward load can be reliably applied to the contact portion.

(5) In some embodiments, in any one of the constitutions (1) to (4), the contact part is provided so as to cover the front of the vehicle body, and comes into contact with the obstacle to face the contact part upward. A protector that deforms to apply a load is provided.
According to the configuration of (5), by providing the protector, the fixed object can be protected from the obstacle, and when the contact portion comes into contact with the obstacle, the contact portion is deformed as well as the obstacle. Also applies an upward load. Therefore, the deformation of the tray away from the airtight holder can be effectively suppressed.
In addition, since the protector is disposed separately from the contact portion, the protector in contact with the obstacle is deformed so as to guide the obstacle to the lower surface of the tray by moving the obstacle along the lower surface of the protector. Can be effectively suppressed.

(6) In some embodiments, in any of the above-described configurations (1) to (5), the airtight holding device is an O-ring.
According to the above configuration (6), the airtightness holder can be simplified and reduced in cost.

(7) In some embodiments, in any one of the constitutions (1) to (6), the fixed object is an evaporator constituting a part of a cooling device for cooling the battery.
According to the above configuration (7), even when the tray comes into contact with an obstacle, the confidentiality of the hole of the tray formed for disposing the evaporator can be maintained.

  According to some embodiments of the present invention, when an object to be fixed is protruded from a hole formed in a tray containing a battery, the confidentiality of the tray is maintained even if the tray interferes with an obstacle. Can be held. Accordingly, it is possible to suppress rainwater, jumping water, foreign matter, and the like from entering the tray.

It is a front view sectional view of the underfloor structure of the vehicles concerning one embodiment. It is a perspective view of the underfloor structure of the vehicle concerning one embodiment. It is a front view sectional view of the underfloor structure of the vehicles concerning one embodiment. It is a front view sectional view of the tray deformation control member concerning one embodiment. It is a front view sectional view of the tray deformation control member concerning one embodiment. It is a perspective view of a tray deformation control member concerning one embodiment. It is front sectional drawing of the underfloor structure of the conventional vehicle. It is sectional drawing which shows the behavior at the time of the obstacle contact of the underfloor structure of the conventional vehicle. It is front sectional drawing of the underfloor structure of the vehicle which concerns on a comparative example (unreleased).

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in these embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just
For example, expressions representing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly described. In addition to such an arrangement, it is also possible to represent a state of being relatively displaced with a tolerance or an angle or a distance at which the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which indicate that things are in the same state, not only represent strictly equal states, but also have a tolerance or a difference that provides the same function. An existing state shall also be represented.
For example, an expression representing a shape such as a square shape or a cylindrical shape not only represents a shape such as a square shape or a cylindrical shape in a strictly geometrical sense, but also an uneven portion or a chamfer within a range where the same effect can be obtained. A shape including a part and the like is also represented.
On the other hand, the expression “comprising”, “comprising”, “including”, “including”, or “having” one component is not an exclusive expression excluding the existence of another component.

As shown in FIGS. 1 and 2, a battery case for housing a running battery is provided below a floor wall (not shown) of the vehicle body. The battery case is composed of a cover 11 on the upper part and a tray 12 on the lower part.
The underfloor structure 10 for a vehicle according to some embodiments of the present invention has a structure in which a hole 12a is formed in a front portion of a body of a tray 12, and a fixed object 14 projects outward from the hole 12a to the front of the vehicle body. From outside the tray 12.
The tray deformation suppressing member 16 includes a fixing part 18 and a contact part 20. The fixing portion 18 is fixed to the outer surface of the tray 12 around the hole 12a. The contact portion 20 is formed integrally with the fixing portion 18, and is guided from the fixing portion 16 below the fixed object 14 toward the front of the vehicle body (in the direction of the arrow a).
When the obstacle o is approached from the front of the vehicle body and comes into contact with the contact portion 20 during traveling of the vehicle, the shape and the arrangement position of the contact portion 20 are set so that the contact portion 20 receives the upward load Lu from the obstacle.
Further, an airtight holder 22 is interposed between the fixed object 14 and the tray 12 so as to surround the hole 12a.

With the above configuration, when the contact portion 20 of the tray deformation suppressing member 14 comes into contact with the obstacle o, an upward load Lu is applied, and the tray deformation suppressing member 14 is bent at the boundary between the fixing portion 18 and the contact portion 20. An upward force moment M is generated about the center P.
As a result, a force f acts on the fixing portion 18 integrated with the contact portion 20 in a direction approaching the peripheral portion of the hole of the tray 12, and the tray 12 around the hole 12 a is pushed toward the airtight holding member 22. The confidentiality of the tray 12 can be maintained. Therefore, invasion of water, foreign matter, and the like into the inside of the tray 12 can be suppressed.

In the exemplary embodiment, as shown in FIG. 1, the contact portion 20 is disposed so as to descend obliquely toward the front of the vehicle body, and the tip portion 26 is oriented in the horizontal direction. Thus, after the obstacle o comes into contact with the contact portion 20, the obstacle o can be made to follow the lower surface of the distal end portion 26. Alternatively, as shown by a dashed line, the distal end portion 26 is inclined upward toward the front of the vehicle body. Thereby, the obstacle 20 can be made to follow the lower surface of the tip portion 26 while deforming when the contact portion 20 comes into contact with the obstacle o.
Thereby, when the obstacle o contacts the contact portion 20, the contact portion 20 deforms and guides the obstacle o along the lower surface of the contact portion 20, so that an upward load Lu acts on the contact portion 20 and the contact portion 20 Since the obstacle 20 deforms and guides the obstacle o to the lower surface of the tray 12, the deformation of the tray 12 can be suppressed. Further, when the obstacle o comes into contact with the contact portion 20, a load for lifting the tray 12 via the contact portion 20 is generated. Thus, the load on the tray 12 from the obstacle o can be reduced, and the deformation of the tray 12 can be suppressed.

  In the exemplary embodiment, as shown in FIGS. 1 and 2, the fixed object 14 is an evaporator constituting a part of a cooling device for cooling a battery housed in a battery case. As shown in FIG. 1, a refrigerant pipe 15 is connected to the evaporator. In order to avoid leakage of the refrigerant inside the battery case, the refrigerant pipe 15 is provided outside the battery case and connected to an evaporator protruding outward from the tray 12.

  In the exemplary embodiment, an O-ring is used as the airtight retainer 22, as shown in FIG. Thereby, the airtight holding tool 22 can be simplified and reduced in cost.

In the illustrated embodiment, as shown in FIG. 1, the fixed object 14 has a head flange portion 14 a disposed inside the tray 12. The head flange portion 14a is disposed so as to face the inner surface of the tray around the hole 12a, and the airtight holding member 22 is interposed between the head flange portion 14a and the inner surface of the tray. The airtight holder 22 is disposed between the head flange portion 14a and the tray 12 around the hole 12a so as to surround the fixed object 14.
Thereby, the confidentiality inside the tray can be effectively maintained.

In the illustrated embodiment, the fixing portion 18 is formed in a U shape around the fixed object 14, except on the upper side, on both sides of the fixed object 14 and on three regions below. Alternatively, instead of forming the fixing portion 18 into a U-shape, the fixing portion 18 may be configured to surround the entire circumference of the fixed object 14.
In the illustrated embodiment, both the fixing portion 18 and the contact portion 20 of the tray deformation suppressing member 14 are made of sheet metal. Thereby, the bending process of the tray deformation suppressing member 14 becomes easy, and the contact portion 20 can be easily formed into a desired shape, and can be easily formed into a position and an inclination for receiving the upward load Lu from the obstacle o.
In the illustrated embodiment, as shown in FIG. 1, the contact portion 20 is disposed so as to be inclined downward toward the front of the vehicle body, and the tip portion 26 is disposed below the lower surface position of the front suspension or the cross member. .
In the illustrated embodiment, as shown in FIGS. 1 and 2, the fixing portion 16 of the tray deformation suppressing member 14 is fixed to the outer surface of the tray 12 using a fixing tool 24 such as a bolt.

In the exemplary embodiment, as shown in FIG. 4, the tip 26 (26a) of the contact portion 20 (20a) of the tray deformation suppressing member 16 (16a) is formed in an arc shape facing upward.
Thus, when the distal end portion 26 (26a) comes into contact with the obstacle o, the obstacle o can be made to follow the lower surface of the contact portion 20 (20a) along the arc shape of the distal end portion 26 (26a). Thereby, the upward load Lu can be reliably applied to the contact portion 20 (20a).

In an exemplary embodiment, as shown in FIG. 5, the tip 26 (26b) of the contact portion 20 (20b) has a cylindrical cross section.
Thereby, when the tip portion 26 (26b) comes into contact with the obstacle o, the obstacle o can be made to follow the lower surface of the contact portion 20 (20b) along the surface of the tip portion 26 (26b). Thereby, the upward load Lu can be reliably applied to the contact portion 20 (20b).

In the exemplary embodiment, as shown in FIG. 6, a rotatable roller 28 is provided at the tip 26 (26c) of the contact portion 20 (20c).
Thus, when the contact portion 20 (20c) comes into contact with the obstacle o, the obstacle o is guided by the roller 28, so that the lower surface of the contact portion 20 (20a) can be formed. Thereby, the upward load Lu can be reliably applied to the contact portion 20 (20c).

In the exemplary embodiment, as shown in FIG. 1, the protector 30 is provided so as to cover the contact portion 20 in front of the vehicle body. The protector 30 is configured to deform and apply an upward load Lu to the contact portion 20 when it comes into contact with the obstacle o.
By providing the protector 30, the fixed object 14 can be protected from the obstacle o, and when the contact portion 20 contacts the obstacle o, the contact portion 20 contacts not only the obstacle o but also the deformable protector 30. Thus, the upward load Lu is applied. Therefore, the deformation of the tray 12 around the hole 12a away from the airtight holder 22 can be effectively suppressed.
Further, since the protector 30 is disposed separately from the contact portion 20, the obstacle o is formed along the lower surface of the protector 20, so that the protector 30 deforms so as to guide the obstacle o to the lower surface of the tray 12. The deformation of the tray 12 can be effectively suppressed.
In FIG. 2, illustration of the refrigerant pipe 15 and the protector 30 is omitted.

FIG. 9 shows a configuration (unpublished comparative example) considered as a means for solving the problem of the present invention before the present inventors arrived at the present invention.
As shown in FIG. 9, when the tray 102 comes into contact with the obstacle o, as shown in FIG. 9, the tray 102 is fixed to the outer surface of the tray around the fixed object 104 in order to suppress deformation of the periphery of the hole 102a. A ring-shaped or U-shaped plate-shaped frame 110 is fixed so as to surround the object 104.
However, according to this problem solving means, when the plate-shaped frame 110 comes into contact with the obstacle o, an out-of-plane deformation occurs in the plate-shaped frame 110 and the deformation of the tray 102 cannot be suppressed. In addition, the load applied to the tray 102 increases as much as the rigidity of the plate-shaped frame 110 increases, and the deformation of the tray 102 is not suppressed. Furthermore, the hole of the plate-shaped frame 110 cannot be made smaller than the hole 102a, and there is a problem that the tray 102 around the hole 102a protrudes from the plate-shaped frame 110 and is easily deformed.

  According to at least one embodiment of the present invention, in a vehicle such as an electric vehicle or a hybrid vehicle including a battery case that houses a battery, an object to be fixed is protruded from a hole formed in the tray of a battery case tray. In this case, even if the tray interferes with an obstacle, the confidentiality of the tray can be maintained. Accordingly, it is possible to suppress rainwater, jumping water, foreign matter, and the like from entering the tray.

10, 100 Under-floor structure of vehicle 11 Cover 12, 102 Tray 12a, 102a Hole 14, 104 Fixed object 14, 104a Head flange part 15, 105 Refrigerant piping 16 (16a, 16b, 16c) Tray deformation suppressing member 18 Fixed part Reference Signs List 20 (20a, 20b, 20c) Contact portion 22, 106 Airtight holding device 24 Fixing device 26 (26a, 26b, 26c) Tip portion 28 Roller 30, 108 Protector 110 Plate frame 112 Floor wall Lu Upward load M Moment of force a Body forward direction o Obstacles

Claims (7)

An underfloor structure of a vehicle including a battery case under a floor of a vehicle body,
An object fixed to the tray in a state of protruding outward from the front of the vehicle body from a hole formed in the tray for housing the battery,
A fixing portion fixed to the tray around the hole from the outside of the tray; and a lower portion of the fixing portion formed integrally with the lower end portion of the fixing portion, from the fixing portion to a lower side of the fixed object and toward the front of the vehicle body. Derived, a tray deformation suppressing member composed of a contact portion configured to contact an obstacle and receive an upward load from the obstacle,
An airtight holder interposed between the fixed object and the tray so as to surround the hole;
An underfloor structure for a vehicle, comprising:   The underfloor structure of a vehicle according to claim 1, wherein a tip portion of the contact portion is bent upward in an arc shape.   The underfloor structure of a vehicle according to claim 1, wherein a tip portion of the contact portion has a cylindrical cross section.   The underfloor structure for a vehicle according to claim 1, wherein a roller is provided at a tip end of the contact portion.   5. A protector provided so as to cover the front of the vehicle body of the contact portion and deforming so as to contact the obstacle and apply an upward load to the contact portion. Item 14. The underfloor structure of the vehicle according to item.   The underfloor structure of a vehicle according to any one of claims 1 to 5, wherein the airtightness holding member is an O-ring.   The underfloor structure of a vehicle according to any one of claims 1 to 6, wherein the fixed object is an evaporator forming a part of a cooling device for cooling the battery.

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