JPH10211890A - Mounting structure for suspension member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity for a bolt plate, facilitate manufacture of a bolt, make possible adopting of caulk mounting, so as to easily obtain a vertical condition of the bolt. SOLUTION: In an upper part of a bolt 3, integrally a pin part 7 is formed, in the pin part 7, by caulking a peripheral edge part of an insert hole of an upper part reinforcing member 6, the upper part of the bolt 3 is fixed to the upper part reinforcing member 6, also in an intermediate part of the bolt 3, a flange part 4 is formed, in a part of a through hole 5C of a lower part reinforcing member 5, an emboss part 5D rising upward is formed, between the emboss part 5D and a bottom surface part 2C of a cross member 2, the flange part 4 of the bolt 3 is interposed, and relating to the insert hole 5C of the lower part reinforcing member 5, the bolt 3 is fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mounting structure for a suspension member of an automobile or the like.

[0002]

2. Description of the Related Art A suspension mechanism of an automobile is provided with various suspension members (suspension frames and the like), and such a suspension member is mounted in a mounting structure as disclosed in, for example, JP-A-3-132410. It is attached to the body components (side members, cross members, brackets).

[0003] A suspension mechanism of this kind is shown in FIG. In FIG. 3, reference numeral 40 denotes a suspension member, and the suspension member 40 is attached to a member on the lower surface of the vehicle body floor via a suspension member attachment structure 41 described later in detail.

Various suspension arms 42 (lower arm 42A, front upper arm 42B, rear upper arm 42C, and lateral link 42D) are rotatably supported on suspension member 40 in a predetermined geometric relationship. Road wheel 4
3 is given a predetermined restraining motion. In addition, 44 is a shock absorber and 45 is a coil spring.

A conventional suspension member mounting structure 41 is shown in FIG. The suspension member mounting structure 41 includes a cross member 22 having a flange portion 22A fixed to the lower surface of the vehicle body floor 21 by welding, and a lower reinforcing member 23 fixed to the bottom surface of the cross member 22. This lower reinforcing member 2
3, a bolt plate 24 having a fitting hole 24A at the center thereof is fixed by welding at the periphery thereof.

A bolt 25 is attached to the bolt plate 24 by fitting a serration portion 25A at an intermediate portion thereof into the fitting hole 24A. A separate upper pin 30 is fixed to the upper end of the bolt 25. The upper pin 30 is fixed to the upper reinforcing member 31 by arc welding by passing the upper pin 30 through the hole 32 of the upper reinforcing member 31, and the peripheral portion of the upper reinforcing member 31 is formed by spot welding the rising portion 33 to the cross member 22 by spot welding. The bolt 25 is supported by the suspension member 40 at the projecting portion of the bolt 25 from the cross member 22 via an insulator 27 in which an elastic body 27C is disposed between the inner cylinder 27A and the outer cylinder 27B. A nut 28 is screwed into the screw portion 25D of the bolt 25, and the inner cylinder 27A of the insulator 27 is fastened and held via a cover member 29.

[0007]

However, in such a conventional mounting structure of a suspension member,
Since the mounting strength of the bolt 25 (suspension member) depends on the fitting between the serration portion 25A of the bolt 25 and the bolt plate 24, in order to improve the mounting strength, the bolt plate itself must be mounted. It has to be thicker or larger.

Further, since the structure relies on the engagement between the serrated portion 25A and the bolt plate 24, the hardness of the serrated portion 25A of the bolt 25 must be increased in order to increase the resistance to the pushing force applied to the bolt 25. It is necessary to raise the fitting force with the bolt plate 24. In order to increase the hardness of the bolt 25, the bolt 25
It is necessary to perform a special treatment such as tempering when manufacturing the bolt 25, and the manufacturing of the bolt 25 is troublesome.

Further, when the bolt plate 24 is thick, not only is it disadvantageous in terms of weight and cost, but also the means for connecting the bolt plate 24 and the lower reinforcing member is limited to arc welding. That is, spot welding, caulking, or the like, which can be easily performed, cannot be used, and the connection must be performed by arc welding, which is relatively difficult to perform.

In addition, a thick bolt plate 24 and a lower reinforcing member 23 are interposed between the flange 25B of the bolt 25 and the bottom surface 22B of the cross member 22. Since the structure is such that the bolt 25 is indirectly abutted against the bottom portion 22B, it is difficult to obtain the vertical state of the bolt 25 with respect to the lower reinforcing member 23, and it takes time to adjust the verticality.

Furthermore, the upper reinforcing member 31 of the bolt 25
Attachment to the upper end of the bolt 25
The upper pin 30 is fixed to the upper reinforcing member 31 by arc welding by passing the upper pin 30 through the hole 32 of the upper reinforcing member 31. For this reason, skill is required for the operation of verticalizing the bolt 25 and the upper pin 31. The upper pin 30 is fixed to the upper reinforcing member 31 by the bolt 25 and the upper reinforcing member 3 for arc welding.
Even if 1 is not centered, it can be attached, affecting the positional relationship between other members and the bolt,
Due to the arc welding between the upper pin 30 and the upper reinforcing member 31, it is necessary to consider the possibility that the head of the bolt 25 may be affected by thermal distortion and change the hardness or the like.

Therefore, the present invention has been made by focusing on such a conventional technique, and does not require a bolt plate, is easy to manufacture a bolt, can employ a crimping mounting, and can maintain the vertical state of the bolt. An object of the present invention is to provide an easily obtainable suspension member mounting structure.

[0013]

According to the present invention, a lower reinforcing member is connected to a bottom surface of a vehicle body component member, an upper reinforcing member is provided at an intermediate height position, and an upper portion of the bolt is fixed to the upper reinforcing member. A structure in which the intermediate part of the suspension member is fixed to the lower reinforcing member and the bottom part in a penetrating state, and the suspension member is attached to a bolt protruding downward from the bottom part.
A pin portion is formed on the upper portion of the bolt, or a concave portion is provided on the upper portion of the bolt, and the peripheral portion of the insertion hole of the upper reinforcing member is crimped to the pin portion or the concave portion, so that the upper portion of the bolt is raised to Along with fixing to the reinforcing member, a flange portion is formed at an intermediate portion of the bolt, an embossed portion which is raised upward is formed at a through hole portion of the lower reinforcing member, and the embossed portion and the bottom portion of the vehicle body component member are formed. The flange of the bolt is sandwiched between the bolts, and the bolt is fitted into the through hole of the lower reinforcing member.

According to the present invention, since the flange of the bolt is sandwiched between the embossed portion of the lower reinforcing member and the bottom surface of the vehicle body component, the mounting strength of the bolt is increased, and as a result, the suspension member The mounting strength is improved, and in particular, the strength against the pushing force is high because the flange is sandwiched in the vertical direction.

Since the flange is sandwiched and attached in this manner, and is not a fitting structure using a bolt plate as in the related art, a special process (tempering, etc.) for increasing the hardness when manufacturing the bolt is performed. Need to be performed, and the bolt can be easily manufactured.

Further, since the lower reinforcing member and the bottom portion are plates, they can be connected by spot welding as well as by caulking, so that not only the connection work is facilitated but also the vertical state of both is easily obtained.

Further, since the flange portion comes into direct contact with the bottom surface of the vehicle body component, it is easy to obtain a vertical state of the bolt with respect to the lower reinforcing member, and it is not necessary to perform troublesome vertical adjustment of the bolt.

Further, the peripheral portion of the insertion hole is caulked by holding the bolt in a state perpendicular to the die of the caulking machine and caulking the peripheral portion of the insertion hole with a punch. The vertical state of the bolt with respect to the member is easily maintained, and the bolt does not undergo thermal distortion deformation due to the conventional arc welding.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the present invention. The mounting structure of this suspension member is shown in FIG.
B is provided with a cross member 2 having a hat-shaped cross section to which it is fixed by welding, a through hole 2A is provided in a bottom surface 2C of the cross member 2, and a bolt 3 is inserted through the through hole 2A. A flange 4 provided at an intermediate portion of the bolt 3 is in contact with the bottom surface 2C. The vehicle body floor 1 and the cross member 2 constitute a vehicle body component.

Reference numeral 5 denotes a lower reinforcing member which is basically in the form of a plate, and has flanges 5A, 5A at its both ends which are respectively joined to the side surfaces 2D, 2D of the cross member 2.
B is formed upward. Further, a through hole 5C is formed in the lower reinforcing member 5, and an embossed portion 5D is formed to protrude upward at a peripheral portion of the through hole 5C.

Reference numeral 6 denotes an upper reinforcing member.
It has a horizontal plate shape itself. An insertion hole 6C having a diameter smaller than that of the through hole 5C is formed in the upper reinforcing member 6, and flanges 6A, 6A, which are respectively connected to both ends of the upper reinforcing member 6 with the side surfaces 2D, 2D of the cross member 2 respectively. 6B is formed upward.

The bolt 3 has a serrated portion 3A formed at the upper portion of the flange portion 4, a screw portion 3B formed at the lower end, and a pin portion 7 having a smaller diameter than the bolt 3 formed integrally at the upper end. A step 3C is formed on the bolt 3, and a serration 7A is formed on the pin 7.

Reference numeral 8 denotes a suspension frame as a suspension member, in which a bolt collar 10 is provided via an insulator 9. Reference numeral 11 denotes a two-piece washer, 12 denotes a cover member, and 13 denotes a nut.

Next, an assembling method will be described.

First, the lower part of the bolt 3 is
The flange 4 is passed through the through hole 2A of the bottom portion 2C of the bottom portion 2C.
C is brought into close contact. Next, the upper portion of the bolt 3 is inserted through the through hole 5C of the lower reinforcing member 5, and the lower reinforcing member 5 is pressed firmly to fit the through hole 5C and the serration portion 3A. Granted. Note that this fitting may be performed by crimping the serration portion 3A 3D or using a means such as tight fitting by press-fitting the bolt 3 into the through hole 5C.

When the through hole 5C is fitted to the serration portion 3A, the lower reinforcing member 5 and the cross member 2 are spot-welded because the lower reinforcing member 5 is in close contact with the bottom surface portion 2C. Spot welding is performed on the lower reinforcing member 5 and the bottom portion 2.
C, between the flange portions 5A and 5B and the side surface portion 2D. Since the lower reinforcing member 5 can be connected by spot welding instead of arc welding which is difficult to perform as in the related art, the welding operation is easy. The flanges 5A and 5B are connected to the side 2D.
, The connection strength of the lower reinforcing member 5 to the bottom surface 2C and the like is high. Moreover, since spot welding can be performed near the embossed portion 5D of the lower reinforcing member 5, the spot welding position becomes closer to the bolt 3, and the mounting strength of the bolt 3 is improved.

By spot welding the lower reinforcing member 5 to the bottom surface 2C and the like, the flange 4 is sandwiched between the embossed portion 5D and the bottom surface 2C. By being clamped, the flange portion 4 more reliably contacts the bottom surface portion 2C, so that the bolt 3 is in a vertical state with respect to the bottom surface portion 2C. Therefore, it does not take much time for the vertical adjustment of the bolt 3 unlike the related art.

Next, the upper reinforcing member 6 is attached from above, the pin portion 7 of the bolt 3 passes through the insertion hole 6C of the upper reinforcing member 6, the step 3C contacts the lower surface of the upper reinforcing member 6, and the flange 6A, 6B is the side portion 2 of the cross member 2
D, 2D, spot welding. The pin portion 7 has its serration portion 7A fitted into the insertion hole 6C,
By caulking 6D the peripheral edge of the insertion hole 6C, the peripheral edge of the insertion hole 6C of the upper reinforcing member 6 becomes
The upper reinforcing member 6 is sandwiched between D and the stepped portion 3 </ b> C.

The crimping operation of the pin portion 7 is performed by the bolt 3
Is held vertically in a die (not shown) of a caulking machine, and the pin portion 7 is caulked by a punch (not shown). For this reason, the vertical state of the bolt 3 with respect to the upper reinforcing member 6 is easily maintained, and the bolt 3 does not undergo thermal distortion deformation unlike the related art. In addition, since the pin 7 is formed integrally with the upper end of the bolt 3, not only can both the vertical state be reliably obtained, but also the step 3C is formed at the upper end of the bolt 3 by the pin 7. Since the step 3C is in contact with the lower surface of the upper reinforcing member 6,
The vertical state of the bolt 3 and the upper reinforcing member 6 can be easily obtained, and the pin portion 7 is formed integrally with the bolt 3, so that there is no fear of rattling or detachment of both as in the conventional case, and stable. Can be achieved. As a result, the bolt 3 is fixed at the upper and lower portions of the intermediate through-holes 2A and 5C and the upper through-hole 6C, so that the bolt 3 is securely prevented from falling.

Then, the cross member 2 to which the bolts 3 are attached by the lower reinforcing member 5 and the upper reinforcing member 6 is attached to the vehicle body floor 1. That is, this attachment is performed by spot welding the flange portions 2B, 2B of the cross member 2 to the lower surface of the vehicle body floor 1.

Next, the bolt collar 10 of the suspension frame 8 is inserted into the bolt 3 projecting downward from the bottom surface 2C of the cross member 2, and the cover member 12 is passed through the screw 3B at the lower end of the bolt 3. After that, it is fixed with a nut 13 through a pair of washers 11. Thus, the mounting of the suspension frame 8 is completed.

According to this embodiment, since the flange 4 of the bolt 3 is sandwiched between the embossed portion 5D of the lower reinforcing member 5 and the bottom surface 2C of the cross member 2, the mounting strength of the bolt 3 is reduced. As a result, the mounting strength of the suspension frame 8 is improved. In particular, because of the structure in which the flange 4 is sandwiched as described above, the strength against the pushing force applied to the bolt 3 from the suspension frame 8 is high. As described above, the strength against the pushing-up force is provided by the sandwiching structure of the flange portion 4 and the fitting between the serration portion 3A and the through hole 5C is only for securing the rotation resistance of the bolt 3, so that the lower reinforcing member 5 A normal plate thickness is sufficient, and spot welding with the bottom portion 2C of the cross member 2 is enabled.

The serrations 3A need only be able to secure the anti-rotational force, and it is not necessary to provide a resistance to the pushing-up force. Therefore, it is not necessary to raise the height of the serrations 3A. It is not necessary to perform a process (tempering, etc.) for increasing the hardness of the bolt 3 when manufacturing the bolt 3, and the bolt 3 can be easily manufactured.

(Embodiment 2) FIG. 2 is a diagram showing Embodiment 2 of the present invention. This embodiment is different from the first embodiment in that the pin portion 7 is formed separately from the bolt 3 on the upper reinforcing member 6 and fitted into the mounting hole 3D formed on the top of the bolt 3. Since the other configuration is the same as that of the first or second embodiment, the same reference numerals are given and the description is omitted. Note that the suspension members such as the suspension frame 8 are omitted.

(Embodiment 3) FIG. 3 is a diagram showing Embodiment 3 of the present invention. In this embodiment, the pin portion 7 of the first or second embodiment is eliminated, and a recess 3E is formed on the upper portion of the bolt 3, and the insertion hole 6 is formed in the recess 3E.
The difference is that the upper reinforcing member 6 is attached to the bolt 3 by caulking the peripheral portion of C downward, and other configurations are the same as those in the first or second embodiment. I will omit the explanation. Note that the suspension members such as the suspension frame 8 are omitted.

[0037]

According to the present invention, since the flange portion of the bolt is sandwiched between the embossed portion of the lower reinforcing member and the bottom portion of the vehicle body component, the mounting strength of the bolt is increased, and as a result, the suspension member The mounting strength is improved, and in particular, the strength against the pushing force is high because the flange is sandwiched in the vertical direction.

As described above, the flange portion is sandwiched and attached, and is not a fitting structure using a bolt plate as in the related art. Therefore, a special process (tempering, etc.) for increasing the hardness when manufacturing the bolt is performed. Need to be performed, and the bolt can be easily manufactured.

Further, since the lower reinforcing member and the bottom portion are plates, they can be connected by spot welding as well as by caulking, so that not only the connection work is facilitated but also a vertical state of both is easily obtained.

Further, since the flange portion is in direct contact with the bottom portion of the vehicle body component, it is easy to obtain a vertical state of the bolt with respect to the lower reinforcing member, and it is not necessary to perform troublesome vertical adjustment of the bolt.

Furthermore, the peripheral portion of the insertion hole into the pin portion or the concave portion of the bolt is caulked by holding the bolt in a state perpendicular to the die of the caulking machine, and caulking the peripheral portion of the insertion hole by a punch. Since this is done, the vertical state of the bolt with respect to the upper reinforcing member is easily maintained, and the bolt does not undergo thermal distortion deformation as in the related art.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting structure of a suspension member according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a mounting structure of a suspension member according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a suspension member mounting structure according to a third embodiment of the present invention.

FIG. 4 is a perspective view of an automobile suspension.

FIG. 5 is a longitudinal sectional view showing a conventional suspension member mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Cross member (body constituent member) 2A Through hole 2B Flange part 2C Bottom part 3 Bolt 3A Serration 3B Screw part 3C Step part 3D Depression 4 Flange 5 Lower reinforcing member 5A, 5B Flange 5C Through hole 6 Upper reinforcement 6A, 6B Flange 6C Insertion hole 6D Caulking part 7 Pin part 8 Suspension frame (suspension member) 9 Insulator 10 Bolt collar 11 Washer 12 Cover member 13 Nut 14 Depressed part

Claims (2)

[Claims] 1. A lower reinforcing member is connected to a bottom surface of a vehicle body component member, and an upper reinforcing member is provided at an intermediate height position, an upper portion of the bolt is fixed to the upper reinforcing member, and an intermediate portion of the bolt is a lower reinforcing member and In a structure in which a suspension member is attached to a bolt protruding downward from the bottom portion while being fixed to the bottom portion in a penetrating state, a pin portion is formed on an upper portion of the bolt, and a peripheral edge of an insertion hole of an upper reinforcing member is formed in the pin portion. The upper part of the bolt is fixed to the upper reinforcing member by caulking the part, a flange part is formed at an intermediate part of the bolt, and an embossed part protruding upward is formed at a through hole part of the lower reinforcing member. A suspension member having a bolt flange sandwiched between the embossed portion and the bottom surface of the vehicle body component, and further having a bolt fitted into a through hole of the lower reinforcing member. Mounting structure. 2. A lower reinforcing member is connected to a bottom surface of a vehicle body component member, and an upper reinforcing member is provided at an intermediate height position, an upper portion of the bolt is fixed to the upper reinforcing member, and an intermediate portion of the bolt is a lower reinforcing member. In a structure in which a suspension member is attached to a bolt protruding downward from the bottom portion and fixed to the bottom portion in a penetrating state, a recess is formed in an upper portion of the bolt, and a peripheral edge of an insertion hole of an upper reinforcing member is formed in the recess. The upper portion of the bolt is fixed to the upper reinforcing member by tightening the portion, a flange portion is formed at an intermediate portion of the bolt, and an embossed portion that is raised upward is formed at a through hole portion of the lower reinforcing member. A suspension comprising: a flange portion of a bolt sandwiched between the embossed portion and a bottom portion of a vehicle body component; and a bolt fitted into a through hole of a lower reinforcing member. Mounting structure for components.