JP2826275B2 - Subframe support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a subframe used for mounting a power unit, which is an assembly of an engine and a transmission integrally, on a body.

[0002]

2. Description of the Related Art Conventionally, as a supporting structure for a subframe of this type, for example, as shown in Japanese Utility Model Laid-Open Publication No. 1-116778, the subframe is bolted to a body.

[0003] By the way, a so-called rigid connection structure in which the bolt holes provided in the sub-frame and the body are directly fixed with fixing bolts is adopted in a sports specification vehicle or the like. When assembling to the body side, usually, the sub-frame with the engine was mounted on the lifter, and the body hung with the chain was lowered on the sub-frame on the lifter and protruded below the body. By inserting and fixing each stud bolt through each bolt hole while aligning the plurality of stud bolts with the plurality of bolt holes formed in the subframe, the subframe is rigidly connected to the lower side of the body. .

[0004]

However, according to the above support structure, since the body is suspended by the chain, the position of the body with respect to the subframe is stabilized when the subframe is assembled to the body. Therefore, it is difficult to align the stud bolts with the bolt holes, and the workability of assembling the subframe to the body is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to assemble a sub-frame to a body without necessitating accurate alignment between a bolt on the body and a bolt hole on the sub-frame. It is an advantage that the work of inserting the bolt hole into the bolt can be simply and reliably performed only roughly, and the workability of assembling the sub-frame to the body can be enhanced.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a bolt hole 13 provided in a subframe 1 is inserted and supported by a bolt 2 projecting from a body B. In the supporting structure of the sub-frame, a mortar-shaped guide cylinder 3 having a large-diameter portion 31 and a small-diameter portion 32 and capable of being deformed into a flat shape by input of a predetermined load is formed. The portion 32 is fixed to the outer peripheral portion of the bolt hole 13 in the sub-frame 1.

According to a second aspect of the present invention, in the first aspect, the first
Under the same prerequisites as the invention, a cross section that expands from the bottom toward the opening side at one of the periphery of the bolt hole 13 forming portion in the subframe 1 and the periphery of the mounting portion of the bolt 2 in the body B. The trapezoidal concave portion 4 is provided, and on the other side, a convex portion 5 having a trapezoidal cross section that can be closely fitted to the concave portion 4 is provided.

[0008]

According to the first aspect of the present invention, subframe 1
Since the small-diameter portion 32 side of the mortar-shaped guide cylinder 3 is fixed to the outer peripheral portion of the bolt hole 13 in the above, when the sub-frame 1 is assembled to the body B side, the bolt 2 protruding from the body B And roughly moving the sub-frame 1 toward the body B in the approaching direction with the large-diameter portion 31 of the guide cylinder 3 provided around the bolt hole 13 facing each other. Thereby, the bolt 2 can be reliably and easily inserted into the bolt hole 13 while guiding the bolt 2 from the large-diameter portion 31 side of the guide cylinder 3 to the small-diameter portion 32. By fastening the insertion end side of the bolt hole 13 of the bolt 2 with a nut or the like, the sub-frame 1 can be securely attached to the body B side.

Therefore, when assembling the sub-frame 1 to the body B side, it is not necessary to precisely align the bolts 2 on the body B side with the bolt holes 13 on the sub-frame 1 side. The work of inserting the bolt holes 13 into the bolts 2 can be simply and reliably performed only by roughly performing the alignment, and the workability of assembling the subframe 1 to the body B can be improved. It is.

Further, since the guide tube 3 can be deformed into a flat shape by inputting a predetermined load, the bolt 2 is inserted through the guide tube 3 into the bolt hole 13 so that the bolt 2 When the insertion end side of the bolt hole 13 is tightened with a nut or the like, the guide tube 3 is deformed into a flat shape by the tightening force, so that the flat deformed guide tube 3 is connected to the body B and the subframe. 1 can also function as a washer interposed therebetween.

According to the second aspect of the present invention, when assembling the sub-frame 1 to the body B, the sub-frame 1 is provided with the concave portion 4 or the convex portion 5 provided in the body B as a guide.
By aligning the bolts 2 on the body B side with the bolt holes 13 on the subframe 1 side, the bolts 2 can be reliably and easily inserted into the bolt holes 13. The bolt hole 13 at
By tightening the insertion end portion side with a nut or the like, the sub-frame 1 can be securely mounted on the body B side, and the mounting workability can be improved.

When the sub-frame 1 is assembled on the body B side, the concave portion 4 and the convex portion 5 having a trapezoidal cross section are inserted and fitted so that their respective tapered surfaces are in close contact with each other. Therefore, the tapered surfaces of the concave portion 4 and the convex portion 5 that are in close contact with each other can prevent slipping or loosening between the body B and the sub-frame 1. It can also be securely and firmly attached to the side.

[0013]

7 and 8 show a pair of left and right side members B which extend in the front-rear direction and constitute a front body B of an automobile.
1, B1 schematically shows a state in which a subframe 1 on which a power unit P is mounted is assembled. The subframe 1 includes a front frame 1a, a rear frame portion 1b, and both of the frame portions 1a, 1a. 1b, a pair of left and right side frame portions 1c, 1c connecting both ends in the length direction of 1b;
A center frame 1d is provided between the front frame 1a and the intermediate portion in the longitudinal direction of the rear frame 1b. Each frame of the sub-frame 1 has a pair of upper and lower hats. Frame material 1
The power unit P is mounted on the sub-frame 1 via a plurality of mounting members M.

Further, the front and rear frame portions 1
a and 1b are formed at both ends in the longitudinal direction of the frame members 11 and 12, respectively, and the bolt holes 13 are formed in the side members B1.
The sub-frame 1 is provided at the lower portion of the side member B1 by protruding the bolts 2 in the opposite direction to each other, inserting these bolts 2 into the respective bolt holes 13 and tightening the insertion end side with a nut 20. It is stiffened to the side.

According to the first invention, as shown in the embodiment of FIGS. 1 and 2, when the front frame portion 1a of the sub-frame 1 is assembled below the side members B1, Bolt hole 13 on 1a side
Is fixed around the bolt hole 13 so that the guide tube 3 is inserted while guiding the bolt to the side of the bolt 2 projecting from the side member B1.
Is an inclined cylindrical wall surface 3 having a large-diameter portion 31 and a small-diameter portion 32.
3, a small-diameter cylindrical portion 34 that can be inserted around the bolt hole 13 of the front frame portion 1a is integrally provided on the small-diameter portion 32 side of the cylindrical wall surface 33, so that the entire appearance is formed in a mortar shape. is there. The small-diameter tube portion 3 of the guide tube 3
4 is inserted around the bolt hole 13 and the large-diameter portion 3 is inserted.
The guide cylinder 3 is connected to the side member B1 by welding means or the like such that one side faces the bolt 2 protruding from the side member B1.

The guide tube 3 guides and inserts the bolt hole 13 into the bolt 2 through the guide tube 3, and the insertion end side of the bolt hole 13 of the bolt 2 is tightened with the nut 20. At this time, the entire cylindrical wall surface 33 of the guide cylinder 3 can be deformed flat by the tightening force. For example, as shown in FIG. 3, the entire cylindrical wall surface 33 is formed to be flush. Alternatively, as shown in FIG. 4, a plurality of slits 35 are formed from the upper end surface of the large-diameter portion 31 to the small-diameter portion 32 side of the cylindrical wall surface 34. In particular, when each of these slits 35 is provided, the bolt 35 When the nut 20 is tightened on the guide tube 2, the guide tube 3 can be reliably deformed into a flat shape with a small tightening force. The guide cylinder 3 may be temporarily elastically deformed, or may be permanently deformed.

Further, in projecting the bolt 2 from the side member B1, in the embodiment shown in FIGS. 1 and 2, the bolt hole 13 in the side member B1 is used.
A nut 22 is fixed to the upper side of the through hole 21 by welding means or the like, and the upper end side of the bolt 2 is screwed to the nut 22 to thereby secure the bolt. 2 protrudes downward from the side member B1. The bolt 2 may be directly fixed to the side member B1.

When assembling the sub-frame 1 to the lower side of the side member B1, first attach the side of the front frame 1a of the sub-frame 1 to the side member B1. The rear frame portion 1b is mounted on the rear side of the side member B1. When the front frame portion 1a is mounted on the side member B1, around the bolt hole 13 formed in the front frame portion 1a. Since the small-diameter tube portion 34 of the guide tube 3 is fixed to the bolt 2 side with the large-diameter portion 31 protruding from the side member B1, the guide tube 3 The side member B1 is roughly positioned so as to face the large-diameter portion 31, and the side member B1 is moved closer to the front frame portion 1a. By moving into, Figure 1
As shown in the figure, while the bolt 2 is guided from the large-diameter portion 31 side of the guide cylinder 3 to the small-diameter portion 32, the bolt hole 13 is securely and easily inserted into the bolt 2, and 2 by tightening the insertion end side of the bolt hole 13 with the nut 20, as shown in FIG.
The side of the front member 1a is the side member B.
1 can be securely mounted in a rigid manner.

As described above, after the front frame portion 1a side is assembled to the side member B1, the rear frame portion 1 is attached to the rear side of the side member B1.
b is assembled via the bolt 2 and the nut 20. Side member B1 of such a rear frame portion 1b
At the time of assembling to the side, the front frame portion 1a is already attached to the side member B1, and a bolt 2 provided at the rear side of the side member B1 and a bolt hole provided at the rear frame portion 1b side. Since the positioning can be performed relatively easily, it is not always necessary to provide the guide tube 3 in the rear frame portion 1b. However, when the guide tube 3 is provided on the side of the rear frame portion 1b, the rear frame portion The side member B on the 1b side
1 can be more easily assembled.

Therefore, when assembling the sub-frame 1 to the side member B1 side, the side member B1
The positioning of the bolt 2 on the side and the bolt hole 13 on the side of the sub-frame 1 is not required to be accurate, and the operation of inserting the bolt hole 13 into the bolt 2 can be performed simply by roughly performing this positioning. It can be performed easily and reliably, and the side member B1 of the sub-frame 1
The workability of assembling to the side can be improved.

In the guide tube 3, the bolt hole 13 is inserted through the guide tube 3 through the bolt 2, and the insertion end side of the bolt hole 13 of the bolt 2 is tightened by the nut 20. At this time, the entire cylinder wall surface 33 of the guide cylinder 3 can be deformed into a flat shape as shown in FIG. 2 by the tightening force, so that the guide tube 3 deformed in the flat shape is connected to the side member B1 and the side member B1. It functions as a washer interposed between the front frame 1a.

5 and 6 show an embodiment of the second invention. In this embodiment, the front frame portion 1a of the sub-frame 1 extends upward from the periphery of the portion where the bolt hole 13 is formed. Forming a concave portion 4 having a trapezoidal cross section that expands,
On the other hand, a convex portion 5 having a trapezoidal cross section which closely fits into the concave portion 4 is formed on the periphery of the mounting portion of the bolt 2 in the side member B1, and the bolt 2 and the bolt hole 13 are And the position is adjusted.

More specifically, the bolt holes 1 of the upper frame member 11 constituting the front frame portion 1a are described.
3, a concave portion 4 having a trapezoidal cross section having an upper opening portion 41 and a bottom portion 42, and having a tapered surface 43 which is inclined outward from the bottom portion 42 toward the opening portion 41 in an expanding manner. The lower frame member 12 constituting the front frame portion 1a is provided with a convex portion 12a extending upward, and is provided on the upper end side of the convex portion 12a and the upper frame member 11. The bottom portion 42 of the concave portion 4 is joined and integrated in a contact state, and the bolt hole 13 is formed at the center of the bottom portion 42 and the convex portion 12a.

The front frame portion 1a is provided on the periphery of the mounting portion of the bolt 2 in the side member B1.
The upper opening 51 and the bottom 52 are similar to the recess 4 provided on the side.
And a convex portion 5 having a trapezoidal cross section which can be fitted tightly into the concave portion 4 having a tapered surface 53 which is inclined outward and outward from the bottom portion 52 toward the opening portion 51 side. The bolts 2 are formed and project from the bottom 52 of the projection 5 in the same manner as in the first invention. The concave 4
May be provided on the side member B1 side, and the convex portion 5 may be provided on the front frame portion 1a side.
The concave portion 4 and the convex portion 5 can be formed in a substantially conical shape or a rectangular conical shape.

When assembling the front frame portion 1a to the side member B1, the convex portion 5 is provided with the concave portion 4 on the front frame portion 1a side while using the convex portion 5 provided on the side member B1 as a guide. By aligning the bolt 2 on the side member B1 side with the bolt hole 13 on the front frame portion 1a side so as to be inserted, the bolt 2 in the bolt hole 13 is adjusted.
Can be easily and reliably performed without requiring heavy labor and a long time.
By tightening the insertion end side of the bolt hole 13 with the nut 20, the sub-frame 1 can be securely assembled to the side member B1 side, and assembling workability can be improved.

When the front frame portion 1a is assembled to the side member B1, the concave portion 4 and the convex portion 5 are inserted so that the respective tapered surfaces 43, 53 are in close contact with each other. Therefore, the tapered surfaces 43 and 53 of the concave portion 4 and the convex portion 5 which are in close contact with each other can prevent the occurrence of slipping or loosening between the side member B1 and the front frame portion 1a. The front frame portion 1a can be securely and firmly attached to the side member B1.

[0027]

As described above, according to the first aspect of the present invention, the guide cylinder 3 having a mortar shape is formed, and the small diameter portion 32 side of the guide hole 3 is formed in the bolt hole 13 in the subframe 1. When the sub-frame 1 is mounted on the body B side, the large-diameter portion 31 of the guide cylinder 3 provided around the bolt 2 and the bolt hole 13 when the sub-frame 1 is mounted on the body B side. The bolt 2 is moved from the large diameter portion 31 side of the guide cylinder 3 to the small diameter by moving the subframe 1 in the approaching direction with respect to the body B by roughly aligning the subframe 1 with the body B. The bolt 2 can be reliably and easily inserted into the bolt hole 13 while being guided to the portion 32. Further, by tightening the insertion end side of the bolt hole 13 of the bolt 2 with a nut or the like, The sub The frame 1 can be assembled reliably to the body B side.

Therefore, when assembling the sub-frame 1 to the body B side, it is not necessary to accurately align the bolt 2 on the body B side with the bolt hole 13 on the sub-frame 1 side. The work of inserting the bolt holes 13 into the bolts 2 can be simply and reliably performed only by roughly performing the alignment, and the workability of assembling the subframe 1 to the body B can be improved. It is.

Further, since the guide cylinder 3 can be deformed into a flat shape by inputting a predetermined load, the bolt 2 is inserted through the guide cylinder 3 into the bolt hole 13, and When the insertion end side of the bolt hole 13 is tightened with a nut or the like, the guide tube 3 is deformed into a flat shape by the tightening force, so that the flat deformed guide tube 3 is connected to the body B and the subframe. 1 can also function as a washer interposed therebetween.

Further, according to the second aspect of the present invention, when assembling the sub-frame 1 to the body B side, the sub-frame 1 is provided with the concave portion 4 or the convex portion 5 provided in the body B as a guide. By aligning the bolt 2 on the body B with the bolt hole 13 on the subframe 1, the bolt 2 can be reliably and easily inserted into the bolt hole 13. By tightening the insertion end side of the bolt hole 13 with a nut or the like, the sub-frame 1 can be securely mounted on the body B side, and the mounting workability can be improved.

When the sub-frame 1 is assembled on the body B side, the concave portion 4 and the convex portion 5 having a trapezoidal cross section are inserted and fitted so that their respective tapered surfaces are in close contact with each other. Therefore, the tapered surfaces of the concave portion 4 and the convex portion 5 that are in close contact with each other can prevent slipping or loosening between the body B and the sub-frame 1. It can also be securely and firmly attached to the side.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a support structure of a subframe according to a first invention.

FIG. 2 is a longitudinal sectional view showing an assembled state of the sub-frame on a body side.

FIG. 3 is a perspective view showing a guide cylinder.

FIG. 4 is a perspective view showing another embodiment of the guide cylinder.

FIG. 5 is a longitudinal sectional view showing a subframe support structure according to a second invention.

FIG. 6 is a longitudinal sectional view showing an assembled state of the sub-frame on a body side.

FIG. 7 is a schematic side view showing the entire subframe.

FIG. 8 is a schematic plan view showing the entire subframe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Side frame 13 ... Bolt hole 2 ... Bolt 3 ... Guide cylinder 31 ... Large diameter part 32 ... Small diameter part 4 ... Concave part 5 ... Convex part B ... Body

Claims (2)

(57) [Claims] 1. A bolt hole (1) provided in a subframe (1).
3) A sub-frame support structure for inserting and supporting a bolt (2) projecting from a body (B), having a large-diameter portion (31) and a small-diameter portion (32), and having a predetermined load. A mortar-shaped guide cylinder (3) that can be deformed into a flat shape by input is formed, and the small-diameter portion (32) side of the guide cylinder (3) is placed on the outer periphery of the bolt hole (13) in the subframe (1). A support structure for a subframe, which is fixed to a part. 2. A bolt hole (1) provided in a subframe (1).
3) A support structure for a sub-frame in which a bolt (2) protruding from a body (B) is inserted into and supported by the sub-frame, wherein a peripheral edge of a formation part of a bolt hole (13) in the sub-frame (1); A trapezoidal concave portion (4) that expands from the bottom toward the opening is provided at one of the mounting portion peripheral edges of the bolt (2) in the body (B), and the concave portion (4) is provided at the other. A support structure for a sub-frame, wherein a convex portion (5) having a trapezoidal cross section that can be closely fitted is provided.