JP2021126976A - Vehicle rear part structure - Google Patents

Abstract

To provide a vehicle rear part structure capable of improving the strength of a stay mounting part periphery without increasing a wall thickness.SOLUTION: A vehicle rear part structure includes: an electrically opened and closed back door 12; a trough 16 constituting the peripheral edge of a back door opening 14; a stay retainer 36 joined to the trough 16; a damper stay 28 expanding and contracting according to the opening amount of the back door 12; and a stay bracket 34 mounted on the stay retainer 36 and the trough 16 and connected so that a vehicle body side end part of the damper stay 28 can rotate. In both of the trough 16 and the stay retainer 36, to have a first surface 42 which permits the stay bracket 34 to be fastened and a second surface 44 connected to the first surface 42 through a bending line 40 extending in the vehicle width direction, a midway part thereof is bent and each of the first surface 42 and the second surface 44 is provided with a junction point 48.SELECTED DRAWING: Figure 3

Description

This specification discloses the rear structure of a vehicle having an electric back door.

Conventionally, there is known a vehicle in which luggage can be taken in and out of the luggage room through a back door opening at the rear end of the vehicle which is opened and closed by a back door. Between the back door of such a vehicle and the vehicle body, a damper stay that supports the opening of the back door is usually arranged. This damper stay is telescopic, and its vehicle body side end is attached to the periphery of the back door opening.

More specifically, a stay bracket is fastened to the roof forming the peripheral edge of the back door opening, and the end portion of the stay on the vehicle body side is rotatably connected to the stay bracket. Further, a panel member called a stay retainer is overlapped around the fastening portion of the stay bracket in the troof and is joined to the troof. For example, Patent Document 1 discloses a configuration similar to this.

Japanese Unexamined Patent Publication No. 2012-240514

By the way, in recent years, an electric back door that automatically opens and closes the back door has been proposed. In the case of such an electric back door, while the burden on the user is reduced, an excessive load may be applied around the mounting portion of the stay. For example, when the back door is electrically opened, for some reason, the user may try to close the back door and strongly press the back door. In this case, a large load is generated on the stay bracket, and thus the stay retainer and the roof via the damper stay, which may cause deformation of the stay retainer and the roof, peeling of the joint point, and the like.

Of course, if the wall thickness of the proof or stay retainer is increased, these strengths can be improved, and the above-mentioned deformation and peeling of the joint point can be prevented. However, such an increase in the wall thickness of the member causes another problem such as an increase in the weight of the vehicle and an increase in the cost due to the increase in the material cost.

Therefore, the present specification discloses a vehicle rear structure capable of improving the strength around the stay mounting portion without increasing the wall thickness.

The vehicle rear structure disclosed in the present specification is joined to the back door that electrically opens and closes the back door opening at the rear end of the vehicle, the first panel member that constitutes the peripheral edge of the back door opening, and the first panel member. The reinforcing member is interposed between the back door and the back door opening, and the damper stay that expands and contracts according to the opening amount of the back door, and is attached to the reinforcing member and the first panel member, and the damper stay. The stay bracket is provided with a stay bracket rotatably connected to the vehicle body side end portion, and the stay bracket is fastened to both the overlapping portion of the first panel member with the reinforcing member and the reinforcing member. It is bent in the middle so as to have one surface and a second surface that is connected to the first surface via a bending line extending in the vehicle width direction and has an angle with respect to the first surface. A joint point between the first panel member and the reinforcing member is provided on each of the first surface and the second surface.

With such a configuration, peeling of the joint point and deformation of the first panel member and the reinforcing member can be effectively suppressed without increasing the wall thickness of the first panel member and the reinforcing member.

In this case, the second surface is located below the first surface with the bending line in between, and may have a gentler inclination than the first surface.

Further, the damper stay may be attached so that the vertical relationship between the door side end portion and the vehicle body side end portion is reversed when the back door is fully closed and fully opened.

According to the vehicle rear structure disclosed in the present specification, the strength around the stay mounting portion can be improved without increasing the wall thickness.

It is a schematic side view of the rear part of a vehicle. It is a schematic perspective view around the stay bracket. It is sectional drawing around the stay bracket. It is sectional drawing around the stay bracket in the comparative example. It is sectional drawing around the stay bracket in another modification.

Hereinafter, the vehicle rear structure will be described with reference to the drawings. FIG. 1 is a schematic side view of the rear part of the vehicle 10. As shown in FIG. 1, a substantially rectangular back door opening 14 is provided at the rear end of the vehicle 10. The back door opening 14 communicates with a luggage space 13 provided at the rear of the vehicle, and the user can access the luggage space 13 through the back door opening 14. Around the back door opening 14, there are toro 16 arranged on both sides in the vehicle width direction, a rear roof header arranged on the upper side of the vehicle, and the like. Of these, the proof 16 functions as a first panel member forming the peripheral edge of the back door opening 14.

As shown in FIG. 1, the back door opening 14 is covered with the back door 12 so as to be openable and closable. The back door 12 is a flip-up door rotatably supported by a hinge 15 provided near the upper end thereof. The hinge 15 has a rotation axis parallel to the vehicle width direction. The back door 12 is opened and closed by swinging around the rotation axis of the hinge 15.

A damper stay 28 is provided at the rear of the vehicle in order to open and close the back door 12. The damper stay 28 is a unit for electrically opening and closing the back door 12. Two damper stays 28 are provided, one on each side of the door opening in the vehicle width direction. Each damper stay 28 opens and closes the back door 12 by expanding and contracting using the drive of a motor.

The damper stay 28 has a cylinder 30 and a piston rod 32 that can expand and contract in the axial direction of the cylinder 30, has a damper function using a spring or gas, and opens and closes the back door 12 by a motor and a spindle. Regarding such a damper stay 28, it is advisable to refer to the description of Japanese Patent No. 4430044 and the like.

The vehicle body side end of the damper stay 28 is rotatably attached to the vehicle body, and the door side end is rotatably attached to the back door 12 by a hinge pin, a ball joint, or the like. Stay brackets 34 (not shown in FIG. 1, see FIGS. 2 and 3) for attaching the damper stay 28 are fastened to the roof 16 and the back door 12, which are a part of the vehicle body, respectively.

As shown in FIG. 1, the damper stay 28 extends as the opening amount of the back door 12 increases. Further, the damper stay 28 rotates so that the end portion on the door side moves upward and backward as the opening amount of the back door 12 increases. That is, the damper stay 28 of this example is a reversing stay in which the vertical relationship between the vehicle body side end portion and the door side end portion is reversed between when fully closed and when fully opened.

Next, the mounting configuration of the vehicle body side end portion of the damper stay 28 will be described with reference to FIGS. 2 and 3. FIG. 2 is a schematic perspective view of the periphery of the stay bracket 34, and FIG. 3 is a cross-sectional view of the periphery of the stay bracket 34. As described above, the vehicle body side end portion of the damper stay 28 is connected to the roof 16 forming the peripheral edge of the back door 12 via the stay bracket 34. The trolley 16 is a first panel member that constitutes the peripheral edge of the back door 12. The stay bracket 34 is fastened to the vicinity of the upper corner portion of the proof 16.

Further, behind the toro 16 (that is, toward the inside of the vehicle from the toro 16 or on the opposite side of the stay bracket 34 with the toro 16 in between), a stay retainer 36 for reinforcing the toro 16 is provided. The stay retainer 36 is made of metal like the toro 16, and functions as a reinforcing member to be joined to the toro 16 (first panel member). The stay retainer 36 has a size that covers only the periphery of the mounting portion of the stay bracket 34. The stay retainer 36 is arranged so as to be overlapped with the toro 16 in the thickness direction, and is joined to the toro 16 by welding. In FIG. 2, the roof 16 and the stay retainer 36 are shown separately. The black circles in FIGS. 2 and 3 indicate the joint point 48 between the proof 16 and the stay retainer 36.

Here, in this example, the stay retainer 36 is bent up and down in the middle of the stay retainer 36. As a result, the stay retainer 36 has two surfaces, a first surface 42r and a second surface 44r, located on both sides of the bending line 40r extending in the vehicle width direction. In this example, the second surface 44r is continuous with the lower end of the first surface 42r, and its inclination is gentler (that is, closer to horizontal) than the first surface 42r.

The overlapping portion of the proof 16 with the stay retainer 36 (hereinafter referred to as “fastening area”) is bent in the middle as in the case of the stay retainer 36. Therefore, the fastening area of the trolley 16 also has a first surface 42t and a second surface 44t connected to the lower end of the first surface 42t with the bending line 40t extending in the vehicle width direction as a boundary. The inclination of the surface 44t is gentler than the inclination of the first surface 42t. In the following, when it is not necessary to distinguish whether the stay retainer 36 or the proof 16 belongs, the subscripts r and t are omitted, and "first surface 42", "second surface 44", and so on. It is called "bending line 40".

Fastening holes 38 are formed in the first surface 42 of the stay retainer 36 and the toro 16. In this example, two fastening holes 38 are provided at intervals in the vertical direction (that is, the elongated direction of the fastening area). The fastening hole 38 is a hole through which a fastening bolt 50 (see FIG. 3) for screwing and fastening the stay bracket 34 is inserted. The stay bracket 34 is arranged on the first surface 42t, and is fastened to the roof 16 and the stay retainer 36 by the fastening bolt 50 and the fastening nut 52.

Further, in this example, a joint point 48 is provided on the first surface 42 of the roof 16 and the stay retainer 36. Further, in this example, a joining point 48 is also provided on the second surface 44, that is, the surface opposite the fastening hole 38 with the bending line 40 interposed therebetween. As is clear from FIGS. 2 and 3, in this example, the bottom surface of the stay bracket 34 is within the range of the first surface 42 and does not reach the second surface 44.

Here, as is clear from the above description, in this example, the stay retainer 36 and the roof 16 are bent in the middle to form the first surface 42 and the second surface 44. The reason for adopting such a configuration will be described in comparison with a comparative example.

FIG. 4 is a cross-sectional view of the periphery of the stay bracket 34 in the comparative example. In the comparative example, the fastening area between the stay retainer 36 and the stay retainer 36 of the toro 16 has a flat plate shape without a bending line 40. In the case of such a configuration, peeling of the joint point 48 and deformation of the stay retainer 36 and the proof 16 were likely to occur.

That is, in the electric back door 12, for some reason, it may be desired to close the back door 12 that has been opened once. In this case, the user pushes the back door 12 that is about to open strongly against the extension force of the damper stay 28. As a result, a large load may be applied to the stay bracket 34 via the damper stay 28.

Here, as described above, in the case of the reversible back door 12, the inclination of the damper stay 28 changes significantly. Therefore, depending on the timing at which the user pushes the back door 12, a force in the direction of rotating the stay bracket 34 may act. For example, when the back door 12 is strongly pushed in while the damper stay 28 is tilted as shown in FIG. 4, a force in the direction of the white arrow C acts on the stay bracket 34. When such a force is received, the stay bracket 34 tends to rotate in the direction of arrow D about the intermediate position between the two fastening bolts 50.

Then, when the stay bracket 34 tries to rotate, a force in the peeling direction acts on the roof 16 and the stay retainer 36. Here, in general, the joint point 48 is strong against the force in the shearing direction, but weak against the force in the peeling direction. Therefore, in the comparative example shown in FIG. 4, the joint point 48 is peeled off, and the stay retainer 36 and the stay bracket 34 are separated relatively easily.

The rotation of the stay bracket 34 can be suppressed to some extent by widening the distance between the two fastening bolts 50. However, if the interval is widened, the size of the stay bracket 34 increases, which leads to an increase in the weight of the vehicle 10 and an increase in cost.

Further, in the comparative example shown in FIG. 4, the fastening area of the stay retainer 36 and the roof 16 has a flat plate shape having no bending line 40. In the case of such a shape, the surface rigidity is poor and the shape is relatively easily deformed. Such deformation of the stay retainer 36 and the roof 16 can be suppressed by increasing the wall thickness of the stay retainer 36 and the roof 16, but also in this case, the weight of the vehicle 10 increases and the cost increases. That is, when the fastening area of the stay retainer 36 and the roof 16 is formed into a flat plate shape having no bending line 40, it is difficult to prevent the joint point 48 from peeling or deforming while suppressing the weight and cost of the vehicle 10. ..

On the other hand, in this example, as shown in FIGS. 2 and 3, the fastening area of the stay retainer 36 and the proof 16 both have a first surface 42 and a second surface 44 separated by a bending line 40 as a boundary. doing. In this case, when the stay bracket 34 tries to rotate in the direction of the arrow D, the rotating force acts as a force in the peeling direction on the first surface 42, but a component in the shearing direction on the second surface 44. Acts as a force to have. In this case, the separation (separation) between the stay retainer 36 and the proof 16 is strongly prevented on the second surface 44. As a result, peeling of the joint point 48 can be effectively prevented not only on the second surface 44 but also on the first surface 42.

Further, in this example, a bending line 40 extending in the vehicle width direction is formed in the fastening area of the stay retainer 36 and the roof 16. With such a configuration, the surface rigidity of the stay retainer 36 and the roof 16 is improved, and the deformation is less likely to occur. In particular, the bending deformation in the vehicle width direction is effectively suppressed in the fastening area of the stay retainer 36 and the roof 16. That is, according to the configuration of this example, it is possible to effectively prevent peeling and deformation of the stay retainer 36 and the roof 16 without increasing the wall thickness.

A first surface 42 to which the stay bracket 34 is fastened and a second surface 44 forming an angle with respect to the first surface 42 are formed in the fastening area of the stay retainer 36 and the roof 16, and the first surface 42 is formed. Other configurations may be modified as long as the junction 48 is provided on each of the and second surfaces 44. For example, in the description so far, only the first surface 42 and the second surface 44 are formed in the fastening area of the stay retainer 36 and the roof 16, but other surfaces may be provided. For example, the second surface 44 may be provided below the first surface 42, and the third surface 46 at an angle to the first surface 42 may be provided above the first surface 42. With such a configuration, peeling and deformation can be suppressed more reliably.

Further, in the description so far, the stay bracket 34 has a shape that does not straddle the bending line 40, but as shown in FIG. 5, the stay bracket 34 straddles the bending line 40 and has the first surface 42 and the first surface 42. The shape may be arranged on both sides 44. With such a configuration, the bottom surface of the stay bracket 34 also has a bent portion, and the deformation of the stay bracket 34 can be effectively suppressed. Further, with such a configuration, the distance between the two fastening bolts 50 can be widened, and the rotational movement of the stay bracket 34 is more reliably suppressed.

Further, in the explanation so far, the damper stay 28 is a reversible stay in which the vertical relationship between the vehicle body side end and the door side end is reversed between when fully closed and when fully open, but the vehicle body side end and the door. It may be a so-called inverted stay in which the vertical relationship of the side ends is always maintained in a constant position. Moreover, it has been explained so far. The shape of each member is an example and may be changed as appropriate.

10 vehicles, 12 back doors, 13 luggage spaces, 14 back door openings, 15 hinges, 16 troofs (first panel member), 28 damper stays, 30 cylinders, 32 piston rods, 34 stay brackets, 36 stay retainers (reinforcing members), 38 fastening holes, 40 bending lines, 42 first surface, 44 second surface, 46 third surface, 48 joint points, 50 fastening bolts, 52 fastening nuts.

Claims (3)

A back door that electrically opens and closes the back door opening at the rear end of the vehicle,
The first panel member constituting the peripheral edge of the back door opening and
A reinforcing member joined to the first panel member and
A damper stay that is interposed between the back door and the back door opening and expands and contracts according to the opening amount of the back door.
A stay bracket that is attached to the reinforcing member and the first panel member and is rotatably connected to the vehicle body side end of the damper stay.
With
Of the first panel member, the overlapping portion with the reinforcing member and the reinforcing member are both on the first surface to which the stay bracket is fastened and on the first surface via a bending line extending in the vehicle width direction. It is bent in the middle so as to have a second surface that is connected and at an angle to the first surface.
A joint point between the first panel member and the reinforcing member is provided on each of the first surface and the second surface.
The rear structure of the vehicle is characterized by that. The vehicle rear structure according to claim 1.
The vehicle rear structure is characterized in that the second surface is located below the first surface across the bending line and has a gentler inclination than the first surface. The vehicle rear structure according to claim 1 or 2.
The vehicle rear structure is characterized in that the damper stay is attached so that the vertical relationship between the door side end portion and the vehicle body side end portion is reversed when the back door is fully closed and fully opened.

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