JP2017109597A - Underfloor structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to retain the air tightness of a tray even if the tray interferes with an obstacle in a case where a fixed object is disposed in a tray of a battery case for accommodating a battery, so as to project from a hole formed in the tray.SOLUTION: An underfloor structure 10 having a battery case under the floor of a vehicle body comprises: an object 14 fixed to a tray so as to project in forward and outward directions of the vehicle body from a hole 12a formed in the tray 12 for accommodating the battery; and a tray deformation hindering member 16 composed of a fixing part 18 fixed to the tray around the hole from the outside of the tray, and a contact part 20 formed integrally with the lower end part of the fixing part, led out on the lower side of the fixed object and toward the front of the vehicle body, and composed so as to come into contact with an obstacle and receive upward load from this obstacle; and an airtight holder 22 interposed between the fixed obstacle and the tray so as to surround the hole.SELECTED DRAWING: Figure 1

Description

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

An electric vehicle such as an electric vehicle or a hybrid vehicle is mounted with a battery for traveling as a battery pack, and travels by driving an electric motor with electric power supplied from the battery pack. The battery pack includes a traveling battery and a battery case that accommodates the traveling battery.
The battery case is usually disposed under the floor of the vehicle body and is positioned 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 traveling battery.

Patent Document 1 discloses a configuration in which an evaporator is provided inside a tray, and refrigerant piping is led to the evaporator via a connector provided on the outer surface of the tray. Moreover, the structure which has arrange | positioned the protector so that the vehicle body front of the refrigerant | coolant piping arrange | positioned ahead of the vehicle body of the tray may be covered is disclosed.
In Patent Document 1, the evaporator is provided inside the tray. However, in order to avoid the leakage of the refrigerant in the battery case, the evaporator and the refrigerant pipe may be arranged outside the battery case.

JP 2014-104842 A

When an object to be fixed such as an evaporator is installed outside the battery case, the conventional vehicle underfloor structure 100 has, for example, a fixed object 104 such as an evaporator provided with a hole 102a formed in a tray 102 as shown in FIG. Projecting from the outside. The head flange portion 104 a of the fixed object 104 is disposed inside the tray 102, and the head flange portion 104 a 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, the inflow of water or foreign matter into the inside of the tray is prevented. When the fixed object 104 is an evaporator, a refrigerant pipe 105 that supplies and discharges the refrigerant is connected to the evaporator.
In FIG. 7, the arrow a indicates the vehicle body front direction, 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 the vehicle body front position of the fixed object 104.

While the vehicle is running, the lower surface of the tray 102 is located below the lower surface 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. There is a case of interfering 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 figure, and the peripheral portion of the hole 102a of the tray 102 is deformed. The wall surface of the tray 102 is separated from the O-ring 106.
Therefore, confidentiality inside the tray is not maintained, and there is a possibility that water and foreign matters such as rain water and jump water enter the tray from the generated gap and 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 disturbed.

  In view of these technical problems, at least one embodiment of the present invention is configured such that a tray interferes with an obstacle when an object to be fixed is protruded from a hole formed in the tray on a tray of a battery case that houses a battery. Even so, the purpose is to keep the confidentiality of the tray.

(1) A vehicle underfloor structure according to some embodiments of the present invention is a vehicle underfloor structure including a battery case under the vehicle body floor, and is formed in front of the vehicle body from a hole formed in a tray for housing the battery. To be fixed to the tray in a state of protruding outward, a fixing portion fixed to the tray around the hole from the outside of the tray, and a lower end portion of the fixing portion. A tray deformation composed of a contact portion that is led out from the fixed portion to the lower side of the fixed object and toward the front of the vehicle body and configured to contact the obstacle and receive an upward load from the obstacle. A restraining member, and an airtight holder interposed between the fixed object and the tray so as to surround the hole.
According to the configuration of (1) above, when the contact portion of the tray deformation suppressing member comes into contact with an obstacle and an upward load is applied, the fixing portion has a force centered on the boundary portion with the contact portion. A moment is applied. This moment of force is applied to the peripheral part of the hole of the tray in a direction opposite to the direction away from the airtight holder, and acts to push the peripheral part of the hole of the tray toward the airtight holder.
Thereby, confidentiality inside the tray can be maintained, and intrusion of water or the like can be suppressed.

  In addition, when a contact part contacts with an obstruction, it is desirable for a contact part to be comprised so that an obstruction may be guide | induced along the lower surface of a contact part. Thereby, an upward load can be reliably applied to the contact portion. Also, by placing the obstacle along the lower surface of the contact portion, the contact portion is deformed so as 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 in an arc shape upward.
According to the configuration of (2), when the contact portion comes into contact with an obstacle, the obstacle can be made to follow the lower surface of the contact portion along the arc shape of the tip portion. Thereby, an upward load can be reliably applied to the contact portion.

(3) In some embodiments, in the configuration of (1), the tip of the contact portion has a cylindrical cross section.
According to the configuration of (3) above, 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 tip portion. Thereby, 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 the tip of the contact portion.
According to the configuration of (4) above, when the contact portion comes into contact with an obstacle, the obstacle can be provided along the lower surface of the contact portion by being guided by the roller provided at the tip portion. Thereby, an upward load can be reliably applied to the contact portion.

(5) In some embodiments, in any one of the configurations (1) to (4), the contact portion is provided so as to cover the front of the vehicle body, and comes into contact with the obstacle and faces upward to the contact portion. A protector that is deformed to add a load is provided.
According to the structure of said (5), while providing the said protector, while being able to protect a to-be-fixed object from an obstruction, when a contact part contacts an obstruction, a contact part is not only an obstruction but a protector which deform | transforms. Also, an upward load is applied. Therefore, the deformation | transformation from which a tray leaves | separates from an airtight holder can be suppressed effectively.
In addition, since the protector is arranged separately from the contact portion, the protector that comes in contact with the obstacle is deformed so that the obstacle is guided to the lower surface of the tray by bringing the obstacle along the lower surface of the protector. Can be effectively suppressed.

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

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

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

It is a front view sectional view of the underfloor structure of 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 vehicles concerning one embodiment. It is front view sectional drawing of the tray deformation | transformation suppression member which concerns on one Embodiment. It is front view sectional drawing of the tray deformation | transformation suppression member which concerns on one Embodiment. It is a perspective view of the tray deformation | transformation suppression member which concerns on one Embodiment. It is a front view sectional view of the underfloor structure of the conventional vehicle. It is sectional drawing which shows the behavior at the time of the obstruction 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 (unpublished).

Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in these embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Only.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of other constituent elements.

As shown in FIG.1 and FIG.2, the battery case which accommodates a battery for driving | running | working is provided under the floor wall (not shown) of a vehicle body. The battery case is composed of a cover 11 and a lower tray 12 at the top.
The vehicle underfloor structure 10 according to some embodiments of the present invention includes a tray 12 with a hole 12a formed in a front portion of the tray 12 and a fixed object 14 protruding outward from the hole 12a. The tray 12 is fixed from the outside.
The tray deformation suppressing member 16 includes a fixed portion 18 and a contact portion 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 fixed portion 18 and is led from the fixed portion 16 below the fixed object 14 toward the front of the vehicle body (in the direction of arrow a).
While the vehicle is running, when the obstacle o approaches from the front of the vehicle body and comes into contact with the contact portion 20, the shape, arrangement position, and the like of the contact portion 20 are set so as to receive the upward load Lu from the obstacle.
In addition, an airtight holding tool 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 fixed 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 fixed portion 18 integrated with the contact portion 20 in a direction approaching the hole peripheral portion of the tray 12, and the tray 12 in the peripheral portion of the hole 12 a is pushed toward the airtight holder 22. The confidentiality of the tray 12 can be maintained. Therefore, it is possible to prevent water, foreign matter, etc. from entering the tray 12.

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 distal end portion 26 is oriented in the horizontal direction. Accordingly, 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 tip end portion 26. Alternatively, as indicated by a one-dot chain line, the tip end portion 26 is inclined upward toward the front of the vehicle body. Thereby, the contact part 20 can be made to follow the lower surface of the front-end | tip part 26, deform | transforming, when the contact part 20 contacts the obstacle o.
Thus, when the obstacle o comes into contact with the contact portion 20, the contact portion 20 is deformed 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. Since the obstacle 20 guides the obstacle o to the lower surface of the tray 12 while being deformed, the deformation of the tray 12 can be suppressed. Further, when the obstacle o comes into contact with the contact part 20, a load for lifting the tray 12 is generated via the contact part 20. Thereby, the load that the tray 12 receives 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 that forms 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 in the battery case, the refrigerant pipe 15 is provided outside the battery case and is connected to an evaporator protruding outward from the tray 12.

  In the exemplary embodiment, an O-ring is used as the airtight holder 22 as shown in FIG. As a result, the hermetic holder 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 to face the inner surface of the tray around the hole 12a, and an airtight holder 22 is interposed between the head flange portion 14a and the inner surface of the tray. The airtight holder 22 is disposed so as to surround the fixed object 14 between the head flange portion 14a and the tray 12 around the hole 12a.
As a result, confidentiality inside the tray can be effectively maintained.

In the illustrated embodiment, the fixing portion 18 is formed in a U shape around the object to be fixed 14 and disposed on both sides of the object to be fixed 14 and three regions below the object 14 except for the upper part. Alternatively, the fixed portion 18 may be configured to surround the entire periphery of the fixed object 14 instead of being U-shaped.
In the illustrated embodiment, the tray deformation suppressing member 14 is made of sheet metal for both the fixing portion 18 and the contact portion 20. Thereby, the bending process of the tray deformation suppressing member 14 is facilitated, the contact portion 20 can be easily processed into a desired shape, and the position and inclination for receiving the upward load Lu from the obstacle o can be easily processed.
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 end portion 26 is disposed below the position of the lower surface 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 end portion 26 (26a) of the contact portion 20 (20a) of the tray deformation suppressing member 16 (16a) is formed in an arc shape upward.
As a result, 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 the 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 front-end | tip part 26 (26b) contacts the obstruction o, the obstruction o can be made to follow the lower surface of the contact part 20 (20b) along the surface of the front-end | tip part 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 distal end portion 26 (26 c) of the contact portion 20 (20 c).
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 contact portion 20 (20c) can be made to follow the lower surface of the contact portion 20 (20a). Thereby, the upward load Lu can be reliably applied to the contact portion 20 (20c).

In the exemplary embodiment, as shown in FIG. 1, a protector 30 is provided so as to cover the front of the vehicle body of the contact portion 20. 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 comes into contact with the obstacle o, the contact portion 20 contacts not only the obstacle o but also the deformable protector 30. Thus, an upward load Lu is applied. Therefore, the deformation | transformation from which the tray 12 around the hole 12a leaves | separates from the airtight holder 22 can be suppressed effectively.
Further, since the protector 30 is arranged separately from the contact portion 20, the protector 30 is deformed so as to guide the obstacle o to the lower surface of the tray 12 by bringing the obstacle o along the lower surface of the protector 20. 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 problem solving means of the present invention before the inventors arrived at the present invention.
As shown in FIG. 9, when the tray 102 comes into contact with the obstacle o, this problem solving means is fixed to the outer surface of the tray around the fixed object 104 in order to suppress deformation of the peripheral portion of the hole 102a. A ring-shaped or U-shaped plate frame 110 is fixed so as to surround the object 104.
However, this problem solution means that when the plate-like frame 110 comes into contact with the obstacle o, out-of-plane deformation occurs in the plate-like frame 110 and the deformation of the tray 102 cannot be suppressed. Further, the load received by the tray 102 is increased by the amount of rigidity of the plate-like frame 110, and the deformation of the tray 102 is not suppressed. Further, the holes in the plate-like frame 110 cannot be made smaller than the holes 102a, and the tray 102 around the hole 102a protrudes from the plate-like frame 110 and easily deforms.

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

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

Claims (7)

A vehicle underfloor structure comprising a battery case under the body floor,
An object to be 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 end portion of the fixing portion are formed integrally with the lower portion of the fixing portion and toward the front of the vehicle body from the fixing portion. A tray deformation suppression member that is derived and is configured to include a contact portion configured to receive an upward load from the obstacle in contact with the obstacle;
An airtight holder interposed between the object to be fixed and the tray so as to surround the hole;
An underfloor structure for a vehicle, comprising:   The vehicle underfloor structure according to claim 1, wherein a tip end portion of the contact portion is bent in an arc shape upward.   The vehicle underfloor structure according to claim 1, wherein a tip end portion of the contact portion has a cylindrical cross section.   The vehicle underfloor structure according to claim 1, further comprising a roller at a tip of the contact portion.   5. A protector that is provided so as to cover the front of the vehicle body of the contact portion and is deformed so as to contact the obstacle and apply an upward load to the contact portion. 6. The under-floor structure of the vehicle according to Item.   The vehicle underfloor structure according to any one of claims 1 to 5, wherein the airtight holder is an O-ring.   The vehicle underfloor structure according to any one of claims 1 to 6, wherein the fixed object is an evaporator constituting a part of a cooling device for cooling the battery.

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