JP6061993B1 - Front subframe stay fastening structure and front subframe body assembly method - Google Patents

Abstract

Provided is a stay fastening structure for a front sub-frame that can absorb manufacturing variations at low cost. A front sub-frame stay fastening structure includes a floor side frame 20 extending along the front-rear direction, a front sub-frame arranged to be continuous with the floor side frame 20, and the floor side frame 20 and the front sub-frame. And a stay 30 in which an engagement opening 37 is formed, and a second nut member 44 for fixing the stay 30 and the floor side frame 20. The second nut member 44 is connected to the nut portion 45 through the coupling portion 46 and the nut portion 45 to which the second bolt member 43 is fastened, and is slidable in the front-rear direction with respect to the stay 30 through the engagement opening 37. And an engaging portion 47 engaged. [Selection] Figure 5

Description

  The present invention relates to a stay fastening structure for a front subframe and a vehicle body assembling method for the front subframe.

  Conventionally, in a vehicle such as an automobile, a rear end portion of a front subframe and a floor side frame are connected by a stay. For example, the stay described in Patent Document 1 is fastened and fixed to the floor side frame by a nut integrally assembled with a nut cover. The nut cover has a locking claw protruding from the arm portion and locked to the locking hole on the side wall of the stay. According to the technique described in Patent Document 1, it is said that the tightening operation of the support bolt can be easily performed in a state where the nut is accurately positioned, and the workability is improved.

JP 2013-248982 A

However, in the above conventional technique, it is necessary to provide a nut cover having an arm portion and a locking claw, a locking hole or the like in the stay, and there is a problem that the manufacturing cost increases because the structure is complicated.
Further, since the locking claw is locked in the locking hole of the stay, the stay cannot move in the vehicle front-rear direction in the state where the stay is assembled to the floor side frame. For this reason, there has been a problem that manufacturing variations such as floor side frames and front subframes cannot be absorbed.

  Accordingly, the present invention provides a stay fastening structure for a front subframe and a method for assembling a vehicle body for the front subframe that can absorb manufacturing variations at low cost.

The front subframe stay fastening structure of the present invention includes a floor side frame (for example, the floor side frame 20 of the embodiment) extending along the vehicle front-rear direction, and a front sub frame arranged to be continuous with the floor side frame. (For example, the front subframe 10 of the embodiment), a stay (for example, the stay 30 of the embodiment) that connects the floor side frame and the front subframe, and the stay and the floor side frame are fixed. A nut member (for example, the second nut member 44 of the embodiment), and the stay includes a notch groove (for example, the notch groove 31b of the embodiment) formed forward from the rear end edge, includes a notch groove forward formed engagement opening (e.g., engagement apertures 37 of the embodiment), wherein the nut Member, a nut portion (e.g., a nut portion 45 of the embodiment) is configured from a connecting portion (e.g., coupling embodiment 46) engaging portion (e.g., the engaging portion 47 of the embodiment), the nut A bolt (for example, the second bolt member 43 of the embodiment) inserted into the notch groove is screwed to the portion , the stay is fixed to the floor side frame, and the connecting portion is the engagement opening. A bending portion (for example, the bending portion 48 of the embodiment) inserted through the nut, extends forward from the nut portion, and the engagement portion is provided at a distal end of the coupling portion, and is connected to the stay. The bending portion is slidable in the vehicle front-rear direction within the engagement opening in a state where the engagement portion is engaged with the stay. , characterized in that.

According to the present invention, since the nut member for fixing the stay and the floor side frame has the engaging portion engaged with the stay, the nut cover is separately provided when the bolt is screwed to the nut member. The nut member can be engaged with the stay without using any other member. Therefore, a low-cost front subframe stay fastening structure can be achieved without increasing the manufacturing cost of the nut member.
In addition, since the engaging portion is engaged with the stay through the engaging opening formed in the stay so as to be slidable in the vehicle front-rear direction, the dimensions of the floor side frame, the front side frame, and the like vary due to manufacturing variations. However, the stay can be fixed to the floor side frame and the front side frame by sliding the nut member in the vehicle longitudinal direction with respect to the stay. Therefore, it is possible to provide a stay fastening structure for the front subframe that can absorb manufacturing variations.

In the stay fastening structure for the front subframe, the engagement opening is formed to be long in the vehicle front-rear direction, and the maximum outer shape of the engagement portion is larger than the width dimension of the engagement opening, and Desirably smaller than the length dimension of the engagement opening.
According to the present invention, since the maximum outer shape of the engagement portion is larger than the width dimension of the engagement opening and smaller than the length dimension of the engagement opening, the engagement portion is inserted through the engagement opening and then engaged. By reversing the part by about 90 °, the engaging part can be engaged with the peripheral part of the engaging opening. Therefore, the engaging part engaged with the stay can be formed with a simple configuration.

In stay fastening structure of the front sub-frame, whereas the principal surface at the one end portion of the front Symbol bend, the distance along the axial direction of the nut portion of the other main surface of the other end, the engagement opening It is desirable that the thickness of the stay is equal to or greater than the thickness of the stay at the peripheral edge.
According to the present invention, the separation distance along the axial direction of the nut portion between the one main surface at one end of the bending portion and the other main surface at the other end is equal to or greater than the thickness of the stay. With the portion inserted through the engagement opening, the engagement portion and the nut portion can be arranged along the stay, respectively. Thereby, since a nut part can be made to contact | abut to a stay, a stay and a floor side frame can be fixed reliably.

In the stay fastening structure for the front subframe, the nut portion is disposed between a nut main body (for example, the nut main body 45a of the embodiment) to which the bolt is screwed, and the nut main body and the stay. A seating surface (for example, the seating surface 45b of the embodiment), and the engaging portion, the connecting portion, and the seating surface are integrally formed of a metal plate, and the nut body is fixed to the seating surface. It is desirable that
According to the present invention, since the engaging portion, the connecting portion, and the seating surface are integrally formed of the metal plate, for example, the engaging portion, the connecting portion, and the seating surface can be formed by pressing. Therefore, the nut member can be manufactured at low cost.

In the stay fastening structure of the front subframe, the stay is fastened together with the front subframe and fixed to a vehicle body (for example, the lateral member 5 of the embodiment), and a joint fastening portion with the front subframe. It is desirable to have a reinforcing plate (for example, the reinforcing plate 35 of the embodiment) fixed to the.
According to the present invention, since the reinforcing plate is provided in the joint fastening portion of the stay and the front subframe, the front subframe can be displaced together with the reinforcing plate when a large external force acts on the front subframe. For this reason, when a collision load is input to the front subframe due to a vehicle collision or the like, the front subframe can be easily dropped together with the reinforcing plate.

In the stay fastening structure for the front subframe, the stay has a pair of stay side walls (for example, the stay side walls 31 of the embodiment) facing in the vehicle left-right direction, and the floor side frame has the pair of stay side walls. A pair of side frame side walls (for example, the side frame side wall 21 of the embodiment) facing the vehicle left-right direction, and the bolt includes the pair of stay side walls and the pair of side frame side walls. A collar member that penetrates along the vehicle left-right direction and extends between the pair of stay side walls along the vehicle left-right direction and through which the bolt is inserted (for example, the color member 25 of the embodiment). The collar member has a large-diameter portion (for example, the large-diameter portion 25a of the embodiment) at least at one end portion, and the one end portion is the one end portion. Of which is connected to the inner surface of one of the side frame side wall of the side frame side wall, the other end extends through the other side frame side wall, it is desirable.
According to the present invention, the collar member has one end connected to the inner surface of one side frame side wall of the pair of side frame side walls, and the other end passes through the other side frame side wall. Even if the distance between the pair of side frame side walls varies, the collar member can be reliably assembled to the floor side frame, and the collar member can be accurately positioned with respect to the floor side frame.
In addition, since one end portion of the collar member connected to the inner side surface of the side frame side wall is a large diameter portion, a large contact area between the side frame side wall and one end portion of the color member can be secured, and the support rigidity to the color member Can be improved.

A front subframe vehicle body assembly method according to the present invention is a front subframe vehicle body assembly method using the stay fastening structure described above, wherein the stay is attached to the floor side frame by the bolt and the nut member. A temporary fastening step (for example, a temporary fastening step S10 of the embodiment) for temporarily fastening the bolts so as to be rotatable around the axis of the bolt and suspending the bolts from the floor side frame; A connecting step (for example, connecting step S20 in the embodiment) for rotating around the axis of the bolt so as to be close to the subframe and fastening together with the front subframe with respect to the vehicle body (for example, the lateral member 5 in the embodiment); It is characterized by having.
According to the present invention, in the temporary fastening process, the stay is temporarily fastened to the vehicle body in the coupling process in a state where the stay is temporarily fastened to the floor side frame by the bolt and the nut member so as to be rotatable around the axis of the bolt. Since it can be fastened together with the subframe, the stay can be slid in the vehicle longitudinal direction even if the position of the through hole through which the fastening member used for joint fastening is displaced from the default position due to manufacturing variations. It can be moved to the tightening position. Therefore, it is possible to provide a vehicle body assembling method for the front subframe that can absorb manufacturing variations.

  ADVANTAGE OF THE INVENTION According to this invention, the stay fastening structure of the front sub-frame which can absorb manufacturing variation at low cost can be provided.

It is a bottom perspective view in the front part of the vehicle of an embodiment. It is a cross-sectional perspective view in the II-II line of FIG. It is a cross-sectional perspective view in the III-III line of FIG. It is the perspective view which looked at the stay from the left rear. It is the cross-sectional perspective view which looked at the connection part of a floor side frame and a stay from the right front. It is a perspective view of the 2nd nut member. It is the perspective view which looked at the stay and 2nd nut member in the connection part of a floor side frame and a stay from the upper left. It is a flowchart which shows the vehicle body assembly | attachment method of the front sub-frame of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the front / rear, up / down / left / right directions are the same as the front / rear, up / down, left / right directions in the vehicle unless otherwise specified. In FIG. Yes.

FIG. 1 is a bottom perspective view of a front portion of a vehicle according to an embodiment.
As shown in FIG. 1, at the front portion of the vehicle 1, a pair of floor side frames 20 extending along the front-rear direction, a front subframe 10 disposed so as to be connected to the pair of floor side frames 20, and a pair A pair of stays 30 for connecting the floor side frame 20 and the front subframe 10 respectively, and a first bolt member 41 and a first nut member 42 for fixing the stay 30 and the front subframe 10 (see FIG. 2) And a second bolt member 43 (corresponding to the “bolt” in the claims) and a second nut member 44 (corresponding to the “nut member” in the claims) for fixing the stay 30 and the floor side frame 20. , Is arranged.

  The front subframe 10 supports suspension parts (not shown). The front subframe 10 mainly includes a subframe main body 11 and a pair of left and right extension arms 13 extending forward from both front end sides of the subframe main body 11. The subframe main body 11 has a rear edge that is curved so that the central portion is recessed forward, a left and right side edge that extends outward in the left-right direction as it goes forward, and a left-right direction as viewed from the vertical direction. And a front edge extending. A pair of left and right extending portions 15 extending rearward are provided on both sides of the rear end of the subframe main body 11. In addition, since a pair of extension part 15 is formed symmetrically mutually, in the following description, the extension part 15 arrange | positioned at the right side is demonstrated unless there is particular description.

2 is a cross-sectional perspective view taken along line II-II in FIG.
As shown in FIG. 2, the extending portion 15 is formed in a hollow shape. Through holes 15a and 15b penetrating in the vertical direction are formed in the upper wall and the bottom wall of the extension portion 15 so as to be coaxial with each other. A collar 17 is inserted through the through hole 15a. The collar 17 is extended along the vertical direction. The lower end of the collar 17 is in contact with the peripheral edge of the through hole 15b from above. The upper end portion of the collar 17 protrudes upward from the extending portion 15. A first bolt member 41 is inserted through the collar 17.

  As shown in FIG. 1, the pair of floor side frames 20 are disposed behind the front subframe 10. The floor side frame 20 has a pair of side frame side walls 21 facing in the left-right direction and a side frame bottom wall 23 that connects the lower end edges of the pair of side frame side walls 21 and has an open U-shaped cross section. (See FIGS. 2 and 3). The front end portion of the floor side frame 20 is curved upward and extends to above the extension portion 15 of the front subframe 10. Since the pair of floor side frames 20 are formed symmetrically with each other, in the following description, the floor side frame 20 disposed on the right side will be described unless otherwise specified.

A front side frame (not shown) is provided outside the floor side frame 20 in the left-right direction.
As shown in FIG. 2, a lateral member 5 (corresponding to a “vehicle body” in the claims) connecting the floor side frame 20 and a front side frame (not shown) is provided at the upper portion of the front end portion of the floor side frame 20. Has been placed. The horizontal member 5 covers the upper opening at the front end of the floor side frame 20. A through hole 5 a is formed in a portion of the horizontal member 5 positioned in front of the floor side frame 20. The through hole 5 a is formed so as to be coaxial with the through hole 15 a of the front subframe 10. The collar 17 is in contact with the peripheral edge of the through hole 5a from below.

3 is a cross-sectional perspective view taken along line III-III in FIG.
As shown in FIG. 3, the right side frame side wall 21 has a through hole 21a penetrating in the left-right direction. The left side frame side wall 21 is formed with a through hole 21b penetrating in the left-right direction. The pair of through holes 21 a and 21 b are formed to be coaxial with each other behind the through hole 5 a (see FIG. 2) of the horizontal member 5 in the floor side frame 20.

  A collar member 25 extending in the left-right direction is inserted between a pair of stay side walls 31 to be described later through the through hole 21b. The right end of the collar member 25 is connected to the inner surface of the right side frame side wall 21. More specifically, the right end portion of the collar member 25 is in contact with the peripheral portion of the through hole 21a formed in the right side frame side wall 21 from the left side, and is fixed by, for example, projection welding. The left end portion of the collar member 25 protrudes from the left side frame side wall 21 toward the left side. The collar member 25 and the left side frame side wall 21 are fixed by, for example, MIG welding. The collar member 25 has a large-diameter portion 25a having an enlarged diameter formed at both ends. A second bolt member 43 is inserted through the collar member 25.

  As shown in FIG. 1, the stay 30 connects the extending portion 15 of the front subframe 10 and the front end portion of the front subframe 10. The stay 30 is fastened together with the front sub-frame 10 to the lateral member 5 at the front end thereof (see FIG. 2). Since the pair of stays 30 are formed symmetrically with each other, in the following description, the stays 30 arranged on the right side will be described unless otherwise specified.

FIG. 4 is a perspective view of the stay as viewed from the left rear.
As shown in FIG. 4, the stay 30 includes a pair of stay side walls 31 that face in the left-right direction, a stay bottom wall 33 that connects lower end edges of the pair of stay side walls 31, and a fastening portion of the front subframe 10. And a reinforcing plate 35 fixed to. The pair of stay side walls 31 and the stay bottom wall 33 are integrally formed plate-like members, and are formed in a U shape that opens upward as viewed from the front-rear direction.

The pair of stay side walls 31 are formed so as to be symmetrical with each other except for an engagement opening 37 described later. The pair of stay side walls 31 are arranged with a gap larger than the width dimension of the floor side frame 20 so that the pair of side frame side walls 21 can be arranged therebetween (see FIG. 3).
The upper edge of the stay side wall 31 is a flange portion 31a formed so as to protrude outward. The upper edge of the stay side wall 31 extends downward from the rear to the front. The stay side wall 31 is provided with a notch groove 31b. The notch groove 31b is formed by being cut out at a middle portion in the vertical direction of the stay side wall 31 so as to have a constant width from the rear edge toward the front. An engagement opening 37 is formed in the right stay side wall 31. The engagement opening 37 is formed in front of the notch groove 31b. The engagement opening 37 is formed in a rectangular shape that is long in the front-rear direction.

  The stay bottom wall 33 is formed in a rectangular shape extending along the front-rear direction when viewed from the vertical direction. The stay bottom wall 33 is provided between the pair of stay side walls 31 and ahead of the pair of stay side walls 31. The rear portion of the stay bottom wall 33 is connected to the lower edges of the pair of stay side walls 31. A groove 33 a is formed in the front end portion of the stay bottom wall 33 along the left-right direction. The groove 33a is formed in a V-shape that protrudes downward when viewed from the left-right direction. A bolt insertion hole 33 b that penetrates the stay bottom wall 33 in the vertical direction is formed in the front portion of the stay bottom wall 33.

The reinforcing plate 35 is disposed in front of the pair of stay side walls 31 and above the stay bottom wall 33. The reinforcing plate 35 is formed in a rectangular shape that overlaps with the stay bottom wall 33 when viewed from above and below. The reinforcing plate 35 is fixed to the upper surface of the stay bottom wall 33 by, for example, welding.
At the front end portion of the reinforcing plate 35, a protruding portion 35a is formed along the left-right direction. The protruding portion 35a is formed to have a V shape protruding downward when viewed from the left-right direction. The protruding part 35 a enters the groove part 33 a of the stay bottom wall 33. The reinforcing plate 35 is formed with a through hole 35b that is coaxial with the bolt insertion hole 33b of the stay bottom wall 33 when viewed from above and below.

  As shown in FIG. 2, the front portion of the stay 30 is disposed so as to cover the extending portion 15 of the front subframe 10 from below. The bolt insertion hole 33 b and the through hole 35 b of the stay 30 are arranged so as to be coaxial with the through hole 15 b of the extending portion 15 of the front subframe 10. The stay 30 is fastened together with the front subframe 10 to the lateral member 5 by a first bolt member 41 and a first nut member 42 and fixed. The first bolt member 41 has a bolt insertion hole 33b, a through hole 35b, a through hole 15b in the front subframe 10, a collar 17, and a through hole 5a in the lateral member 5 extending from the lower side of the stay 30 to the upper side. It penetrates in order. The first bolt member 41 is screwed to the first nut member 42.

  As shown in FIG. 3, the rear portion of the stay 30 is connected to the floor side frame 20 in a state where the pair of side frame side walls 21 are disposed between the pair of stay side walls 31. The pair of cutout grooves 31b of the stay 30 are arranged so as to coincide with the positions of the through holes 21a and 21b of the side frame side wall 21 when viewed from the left-right direction. Further, the left end portion of the collar member 25 is in contact with the peripheral edge portion of the notch groove 31b of the left stay side wall 31. The stay 30 is fixed to the floor side frame 20 by a second bolt member 43 and a second nut member 44. The second bolt member 43 extends along the left-right direction and penetrates the pair of stay side walls 31 and the pair of side frame side walls 21 along the left-right direction. The second bolt member 43 passes through the left notch groove 31b, the collar member 25, the through hole 21a of the floor side frame 20, and the right notch groove 31b in this order from the left side to the right side of the stay 30. The second bolt member 43 is screwed to the second nut member 44.

FIG. 5 is a cross-sectional perspective view of the connecting portion between the floor side frame and the stay as seen from the right front.
As shown in FIG. 5, the second nut member 44 is connected to the nut portion 45 through the coupling portion 46 and the nut portion 45 to which the second bolt member 43 is screwed, and through the engagement opening 37 of the stay 30. And an engaging portion 47 engaged with the stay 30. The nut portion 45 includes a nut main body 45 a to which the second bolt member 43 is screwed, and a seating surface 45 b disposed between the nut main body 45 a and the stay 30. The second nut member 44 is screwed to the second bolt member 43 with the connecting portion 46 inserted through the engagement opening 37.

FIG. 6 is a perspective view of the second nut member.
As shown in FIG. 6, the connection part 46 of the 2nd nut member 44 is extended so that the radial direction of the nut main body 45a may be followed from the seat surface 45b. The connecting portion 46 is formed in a rectangular shape when viewed from the axial direction of the nut main body 45a. As shown in FIGS. 4 to 6, the width dimension a of the connecting portion 46 is smaller than the width dimension W of the engagement opening 37. The engaging portion 47 is provided at the tip of the connecting portion 46 and is formed in a circular shape. The maximum outer shape of the engagement portion 47 is larger than the width dimension W of the engagement opening 37 and smaller than the length dimension L of the engagement opening 37. More specifically, the width dimension b of the engagement portion 47 is larger than the width dimension W of the engagement opening 37 and smaller than the length dimension L of the engagement opening 37. As shown in FIG. 6, the engaging portion 47, the connecting portion 46, and the seating surface 45b are integrally formed of a metal plate formed of, for example, iron. A nut body 45a is fixed to the seat surface 45b by welding or the like, for example.

FIG. 7 is a perspective view of the stay and the second nut member at the connecting portion between the floor side frame and the stay as viewed from the upper left.
As shown in FIG. 7, the connecting portion 46 includes a base end portion 46a extending from the seating surface 45b along the radial direction of the nut body 45a, and a bent portion 48 extending from the base end portion 46a and curved. . The bent portion 48 is inserted through the engagement opening 37. An engaging portion 47 is connected to the tip of the bent portion 48. The engaging portion 47 is located on the opposite side of the nut main body 45a with the seat surface 45b interposed therebetween in the axial direction of the nut main body 45a. The bent portion 48 is curved so that the base end portion 46a and the engaging portion 47 are parallel to each other. The axis of the nut body 45a between the main surface (one main surface) on the engagement opening 37 side at the distal end portion of the bending portion 48 and the main surface (the other main surface) on the engagement opening 37 side at the proximal end portion of the bending portion 48. The separation distance D along the direction is equal to or greater than the plate thickness T of the stay side wall 31 at the peripheral edge of the engagement opening 37. The dimension of the bent part 48 in the extending direction of the base end part 46 a of the connecting part 46 is smaller than the length dimension L (see FIG. 4) of the engagement opening 37. As a result, the engaging portion 47 is slidable in the front-rear direction within the engaging opening 37 while the engaging portion 47 is engaged with the stay 30.

Hereinafter, a vehicle body assembling method of the front sub-frame 10 to which the above-described stay fastening structure of the front sub-frame 10 is applied will be described. In addition, refer to FIGS. 1 to 7 for the reference numerals of the components of the stay fastening structure of the front subframe 10 in the following description.
FIG. 8 is a flowchart illustrating a vehicle body assembling method of the front subframe according to the embodiment.
As shown in FIG. 8, in the vehicle body assembling method of the front sub-frame 10 according to the present embodiment, the stay 30 is attached to the floor side frame 20 with the second bolt member 43 by the second bolt member 43 and the second nut member 44. Is temporarily fastened so as to be rotatable around its axis, and is temporarily suspended by the floor side frame 20, and the shaft of the second bolt member 43 so that the stay 30 is brought close to the front subframe 10. A connecting step S20 that rotates around and is fastened together with the front subframe 10 with respect to the lateral member 5.

First, the temporary fastening step S10 is performed. In the temporary fastening step S <b> 10, the stay 30 is temporarily fastened to the floor side frame 20 by the second bolt member 43 and the second nut member 44.
Specifically, first, the engaging portion 47 of the second nut member 44 is engaged with the engaging opening 37 of the stay 30. At this time, the engaging portion 47 is inserted into the engaging opening 37 in a state where the thickness direction of the engaging portion 47 substantially coincides with the width direction of the engaging opening 37. Next, the second nut member 44 is rotated about 90 ° around the connecting portion 46 so that the bottom surface of the seating surface 45b faces the notch groove 31b. As a result, the width direction of the engagement portion 47 and the width direction of the engagement opening 37 coincide with each other and the engagement portion 47 is caught by the engagement opening 37, so that the engagement portion 47 falls out of the engagement opening 37. It is suppressed. Next, the nut portion 45 is moved so as to approach the notch groove 31b so that the seat surface 45b contacts the peripheral edge of the notch groove 31b. Accordingly, the second nut member 44 is disposed at a predetermined position in a state of being engaged with the peripheral edge portion of the engagement opening 37. Moreover, since the second nut member 44 is inserted through the engagement opening 37 formed long in the front-rear direction, the second nut member 44 can slide in the front-rear direction.

  Next, the cutout grooves 31b of the stay 30 are overlapped with the through holes 21a and 21b of the floor side frame 20 when viewed from the left-right direction, and the pair of side frame side walls 21 are positioned between the pair of stay side walls 31. The stay 30 is arranged.

Next, the second bolt member 43 is inserted in this order from the left side to the right side of the stay 30 into the cutout groove 31b on the left side of the stay 30, the collar member 25, the through hole 21a of the floor side frame 20, and the cutout groove 31b on the right side. Let Next, the distal end portion of the second bolt member 43 is screwed to the second nut member 44 engaged with the engagement opening 37 of the stay 30. At this time, the stay 30 is suspended from the floor side frame 20 by the second bolt member 43 and the second nut member 44 so that both main surfaces of the stay bottom wall 33 face the front-rear direction. Further, the stay 30 is fixed to the floor side frame by the second bolt member 43 and the second nut member 44 so that the stay 30 does not fall off the floor side frame 20 and can be rotated around the axis of the second bolt member 43. Tighten to 20 temporarily.
Thus, the temporary fastening step S10 is completed.

Next, connection process S20 is performed. In the connecting step S <b> 20, the stay 30 is fastened together with the front subframe 10 to the lateral member 5 by the first bolt member 41 and the first nut member 42.
Specifically, the extending portion 15 of the front subframe 10 is disposed below the lateral member 5. At this time, the front subframe 10 is arranged so that the through holes 15 a and 15 b of the front subframe 10 are coaxial with the through hole 5 a of the lateral member 5.

  Next, the stay 30 is rotated around the axis of the second bolt member 43 so that the front portion of the stay 30 is close to the front subframe 10, so that the bolt insertion hole 33 b and the through hole 35 b of the stay 30 are It arrange | positions coaxially with the through-hole 5a. Here, the distance in the front-rear direction between the through holes 21a and 21b of the floor side frame 20 and the through hole 5a of the horizontal member 5 may slightly deviate from a specified value due to manufacturing variation or the like. In this case, the bolt insertion hole 33 b and the through hole 35 b of the stay 30 are arranged at positions shifted from the central axis of the through hole 5 a of the lateral member 5. At this time, the stay 30 temporarily fastened by the second nut member 44 and the second bolt member 43 is slid in the front-rear direction with respect to the floor side frame 20. Thereby, the bolt insertion hole 33 b and the through hole 35 b of the stay 30 can be arranged coaxially with the through hole 5 a of the lateral member 5.

Next, the first bolt member 41 is moved upward from the bottom of the stay 30 to the bolt insertion hole 33b, the through hole 35b, the through hole 15b of the front subframe 10, the collar 17, and the through hole 5a of the horizontal member 5. Are inserted in this order. Next, the tip end portion of the first bolt member 41 is screwed to the first nut member 42. As a result, the stay 30 is fastened together with the front subframe 10 with respect to the lateral member 5.
Thus, the connecting step S20 is completed, and the vehicle body assembly of the front subframe is completed.

According to the stay fastening structure of the front subframe 10 of the present embodiment, the second nut member 44 for fixing the stay 30 and the floor side frame 20 has the engaging portion 47 engaged with the stay 30. Therefore, when the second bolt member 43 is screwed to the second nut member 44, the second nut member 44 can be engaged with the stay 30 without using a member such as a nut cover. Therefore, a low-cost front subframe stay fastening structure can be achieved without increasing the manufacturing cost of the second nut member 44.
In addition, since the engaging portion 47 is engaged with the stay 30 so as to be slidable in the front-rear direction through the engaging opening 37 formed in the stay 30, the dimensions of the floor side frame 20, the front subframe 10, and the like are large. Even if it fluctuates due to manufacturing variations, the stay 30 can be fixed to the floor side frame 20 and the front subframe 10 by sliding the second nut member 44 in the front-rear direction with respect to the stay 30. Therefore, it is possible to provide a stay fastening structure for the front subframe 10 that can absorb manufacturing variations.

  Further, since the maximum outer shape of the engaging portion 47 is larger than the width dimension W of the engaging opening 37 and smaller than the length dimension L of the engaging opening 37, the engaging portion 47 is inserted through the engaging opening 37. By reversing the engaging portion 47 by about 90 °, the engaging portion 47 can be engaged with the peripheral edge portion of the engaging opening 37. Therefore, the engaging portion 47 engaged with the stay 30 can be formed with a simple configuration.

  Further, the separation distance D along the axial direction of the nut portion 45 between the main surface on the engagement opening 37 side at the distal end portion of the bending portion 48 and the main surface on the engagement opening 37 side at the proximal end portion of the bending portion 48 is The stay 30 has a thickness T or more. For this reason, the engaging portion 47 and the nut portion 45 can be arranged along the stay 30 in a state where the bending portion 48 is inserted through the engaging opening 37. Thereby, since the nut part 45 can be contact | abutted to the stay 30, the stay 30 and the floor side frame 20 can be fixed reliably.

  Moreover, since the engaging part 47, the connection part 46, and the seat surface 45b are integrally formed with the metal plate, the engagement part 47, the connection part 46, and the seat surface 45b can be formed by press work, for example. Therefore, the second nut member 44 can be manufactured at a low cost.

  Further, since the reinforcing plate 35 is provided at the joint portion of the stay 30 and the front subframe 10, the front subframe 10 can be displaced together with the reinforcing plate 35 when a large external force is applied to the front subframe 10. For this reason, when a collision load is input to the front subframe 10 due to a vehicle collision or the like, the front subframe 10 is rotated around the axis of the second bolt member 43 together with the reinforcing plate 35, It can be easily removed.

The collar member 25 has a left end connected to the inner surface of the left side frame side wall 21 and a right end passing through the right side frame side wall 21. For this reason, even if the distance between the pair of side frame side walls 21 varies, the collar member 25 can be reliably assembled to the floor side frame 20. Further, the collar member 25 can be accurately positioned with respect to the floor side frame 20.
Moreover, since the left end portion of the collar member 25 connected to the inner surface of the side frame side wall 21 is a large diameter portion 25a, a wide contact area between the side frame side wall 21 and the left end portion of the collar member 25 can be secured, The support rigidity for the collar member 25 can be improved.

  Further, according to the vehicle body assembling method of the front subframe 10 of the present embodiment, the second bolt member with respect to the floor side frame 20 is fixed to the stay 30 by the second bolt member 43 and the second nut member 44 in the temporary fastening step S10. Since the stay 30 can be fastened together with the front subframe 10 with respect to the horizontal member 5 in the connecting step S20 in a temporarily tightened state so as to be rotatable around the axis 43, the position of the through hole 5a of the horizontal member 5 is Even when the position is deviated from the predetermined position due to manufacturing variations, the stay 30 can be slid in the front-rear direction and moved to the co-fastening position. Therefore, it is possible to provide a vehicle body assembling method for the front subframe 10 that can absorb manufacturing variations.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above-described embodiment, the bent portion 48 of the second nut member 44 is formed in an S shape, but is not limited thereto, and may be formed in a crank shape, for example.
Moreover, in the said embodiment, although the engaging part 47 of the 2nd nut member 44 is formed in circular shape, it is not limited to this, For example, you may form in rectangular shape etc.

  In the above embodiment, the engagement opening 37 of the stay 30 is formed in the outer stay side wall 31 in the left-right direction of the pair of stay side walls 31, but is not limited thereto, and the inner stay side wall 31 is not limited thereto. It may be formed. Accordingly, the second nut member 44 may be configured to be engaged with the inner stay side wall 31.

  Moreover, in the said embodiment, although the large diameter part 25a was formed in the both ends of the collar member 25, it is not limited to this, A large diameter part is an end part connected to the inner surface of a side frame side wall at least. If formed, the above-described effects can be achieved.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

5 Lateral member (vehicle body)
DESCRIPTION OF SYMBOLS 10 Front sub-frame 20 Floor side frame 21 Side frame side wall 25 Collar member 25a Large diameter part 30 Stay 31 Stay side wall 35 Reinforcement plate 37 Engagement opening 43 2nd bolt member (bolt)
44 Second nut member (nut member)
45 Nut portion 45a Nut body 45b Seat surface 46 Connection portion 47 Engagement portion 48 Bending portion S10 Temporary fastening step S20 Connection step

Claims (7)

A floor side frame extending along the longitudinal direction of the vehicle;
A front sub-frame arranged to be continuous with the floor side frame;
A stay connecting the floor side frame and the front subframe;
A nut member for fixing the stay and the floor side frame;
With
The stay has a notch groove formed forward from the rear edge, and an engagement opening formed in front of the notch groove,
The nut member includes a nut portion, a coupling portion, and an engaging portion,
The nut part is screwed with a bolt inserted into the notch groove, and fixes the stay to the floor side frame,
The connecting portion has a bent portion inserted through the engagement opening, and extends forward from the nut portion,
The engaging portion is provided at a tip of the connecting portion, and is engaged with the stay so as to be slidable in the vehicle front-rear direction .
The bending portion is slidable in the vehicle front-rear direction within the engagement opening in a state where the engagement portion is engaged with the stay.
A structure for fastening the stay of the front subframe. The engagement opening is formed to be long in the vehicle front-rear direction,
A maximum outer shape of the engagement portion is larger than a width dimension of the engagement opening and smaller than a length dimension of the engagement opening;
The stay fastening structure for a front subframe according to claim 1, wherein: A first main surface at one end of the front Symbol bend, the distance along the axial direction of the nut portion of the other main surface of the other end, said stay above the thickness at the periphery of the engaging opening Has become,
The stay fastening structure for a front subframe according to claim 2, wherein The nut portion is
A nut body to which the bolt is screwed;
A seating surface disposed between the nut body and the stay;
Have
The engaging portion, the connecting portion, and the seating surface are integrally formed of a metal plate,
The nut body is fixed to the seat surface,
The stay fastening structure for a front subframe according to any one of claims 1 to 3, wherein the stay fastening structure is a front subframe. The stay is fixed to the vehicle body by being fastened together with the front sub-frame, and has a reinforcing plate fixed to a joint-fastened portion with the front sub-frame.
The stay fastening structure for a front subframe according to any one of claims 1 to 4, wherein the stay fastening structure is a front subframe. The stay has a pair of stay side walls facing in the left-right direction of the vehicle,
The floor side frame is disposed between the pair of stay side walls and has a pair of side frame side walls facing the vehicle left-right direction,
The bolt penetrates the pair of stay side walls and the pair of side frame side walls along the left-right direction of the vehicle,
A collar member extending between the pair of stay side walls along the left-right direction of the vehicle;
The collar member has a large-diameter portion at least at one end, and the one end is connected to the inner surface of one side frame side wall of the pair of side frame side walls, and the other end is the other side frame. Penetrates the side wall,
The stay fastening structure for a front subframe according to any one of claims 1 to 5, wherein A vehicle body assembly method for a front subframe using the stay fastening structure for a front subframe according to any one of claims 1 to 6,
A temporary fastening step in which the stay is temporarily fastened to the floor side frame by the bolt and the nut member so as to be rotatable around the axis of the bolt, and the stay is suspended from the floor side frame; ,
A connecting step of rotating the stay around an axis of the bolt so as to be close to the front subframe, and fastening together with the front subframe with respect to a vehicle body;
A vehicle body assembling method for a front subframe, comprising:

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