JP3009850B2 - Vehicle frame mounting 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 vehicle frame mounting structure, and more particularly, to a sub-frame mounting structure which is mounted on left and right front side frames and supports an engine or the like.

[0002]

2. Description of the Related Art In a vehicle having a perimeter frame, as shown in FIG. 3, there is provided a structure in which a cross-frame-like sub-frame 2 is installed under a pair of left and right front side frames 1 extending forward and backward, and an engine or the like is supported by this. Has been taken. The sub-frame 2 is attached to the side frame 1 via rubber bush devices at four corners.

FIG. 4 shows a typical example of a mounting structure.
A rubber bush device 3 having an anti-vibration rubber body 33 interposed between an inner cylinder 31 and an outer cylinder 32 shorter than the inner cylinder 31 is attached to a front side frame (hereinafter, simply referred to as a side frame) 1.
And a receiving plate member 4 disposed thereunder. From the side frame 1 side, a hole 12 formed in the side frame 1 forms a flange portion 51 on the outer periphery and a rod-shaped tip having a pipe nut 52 at the tip. The shaft member 5 is inserted into the inner cylinder 31 of the rubber bush device 3, and the bolt 6 is inserted into the inner cylinder 31 from the receiving plate member 4 side and screwed into the pipe nut 52, whereby the inner cylinder 31 is moved to the side frame. Fix to 1. By fixing the sub-frame 2 to the outer cylinder 32 of the rubber bush device 3 connected to the inner cylinder 31 via the vibration-proof rubber body 33, the side frame 1 and the sub-frame 2 are connected via the rubber bush device 3. It has a structure to be connected. The shaft member 5 is fixed to the side frame 1 by welding the flange portion 51 to the side frame 1.

[0004]

The sub-frame 2 is subject to vibrations from the road surface and vibrations of the engine, transmission and the like supported by itself. For this reason, the shaft member 5
Is required to have high strength that is excellent in both toughness and toughness.
A cold forged product such as 20C carbon steel is used. However, it is difficult to form a wide brim on the outer periphery by cold forging. Therefore, stress concentrates around the hole 12 of the side frame 1 which is locked to the narrow brim portion 51, and deformation and cracks occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting structure for a subframe which does not deform or crack around a hole in a side frame to which the load of the subframe or vibration from the subframe acts. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a side frame and a receiving plate member of a vehicle are vertically opposed to each other with an inner cylinder of a rubber bush device interposed therebetween. By inserting a shaft member having a flange portion formed by locking the collar portion around the hole of the side frame, and screwing a tip of the shaft member and a fastening member locked to the receiving plate member. In a frame mounting structure in which the inner cylinder is fixed to a side frame and a subframe for supporting an engine or the like is fixed to the outer cylinder of the rubber bush device, a flange having a larger diameter at one end than a flange portion of the shaft member is provided. The metal bush is fitted with the cylindrical portion into the hole of the side frame, the shaft member is inserted into the cylindrical portion, and the flange portion and around the hole of the side frame are connected to the metal bush. Through, characterized in that allowed locking in (Claim 1).

The shaft member has a pipe nut at the tip, and the fastening member is a bolt having the receiving plate member penetrated and the tip portion screwed to the pipe nut.

[0008] The shaft member is a bolt having a threaded outer end formed through the receiving plate member, and the fastening member is a nut screwed to the tip of the shaft member.

With the above structure, the load acting from the flange of the shaft member to the periphery of the hole of the side frame is distributed over a wide range by the flange of the metal bush. In addition, the load acting on the edge of the hole opening of the side frame due to the swing of the shaft member due to the vibration of the rubber bush device is reduced by the cylindrical portion of the metal bush.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, sub-frames 2 each of which has a substantially girder shape for supporting an engine or the like (not shown) are mounted at the four corners below the left and right side frames 1 of a vehicle. Can be

FIG. 1 shows a cross section of the mounting portion. The side frame 1 has a closed cross section in which a panel having a U-shaped cross section and a panel closing an opening thereof are connected, and a hole 11 is formed in a panel 11 serving as a bottom surface. The sub-frame 2 has an upper panel 21 and a lower panel 22 which are connected in a hollow shape to form a closed cross section.

First, the rubber bush device 3 used for the mounting portion will be described. The rubber bush device 3 includes an inner cylinder 31
And an outer cylinder 32 concentric with the outer cylinder 32 with a vibration-proof rubber body 33 interposed therebetween. Inner cylinder 3
Reference numeral 1 denotes a cylindrical body whose lower half is thicker toward the inner surface. Outer cylinder 3
Reference numeral 2 denotes a hat-shaped cross section, which is lower than the inner cylinder 31, and the cylinder has a double structure. The outer peripheral portion of the lower end of the vibration isolating rubber body 33 is an outer cylinder 32.
And a stopper portion 331 protruding further from the lower end of the upper portion.

A hole 221 corresponding to the outer cylinder 32 is formed in the lower panel 22 of the sub-frame 2. The upper panel 21 has a hole 211 penetrating the inner cylinder 31 at a position concentric with the hole 221. The rubber bush device 3 and the sub-frame 2 are arranged such that the rubber bush device 3 has
Is inserted into the sub-frame 2 so as to protrude from the
2 is joined to the upper panel 21 of the sub-frame 2 by welding and the lower edge of the outer cylinder 32 is joined to the opening edge of a hole 221 provided in the lower panel 22 of the sub-frame 2 by welding.

A rubber stopper member 34 is provided on the outer periphery of the distal end of the inner cylinder 31 protruding from the sub-frame 2, and a washer-shaped metal plate 35 is joined to the upper surfaces of the inner cylinder 31 and the stopper member 34. is there.

On the other hand, the bottom panel 11 of the side frame 1
Has a hole 12 slightly larger in diameter than the shaft member 5, through which the shaft member 5 penetrates. The shaft member 5 is a pipe nut 5 having a pipe-like tip and a thread formed on the inner periphery.
There are two. At an intermediate position of the shaft member 5, a flange portion 51 having a tapered outer periphery and having a lower surface as a locking step portion projects. The shaft member 5 having the flange portion 51 is obtained by cold forging an S20C carbon steel material and forming a screw hole at the tip.

The metal bush 7 is integrally provided with a flange 72 which is thicker than the panel thickness of the side frame 1 and has a larger diameter than the flange 51 around the upper end opening of the cylindrical portion 71. Then, the cylindrical portion 71 is fitted into the hole 12 of the side frame 1 in a tight fitting manner, and the pipe nut 52 of the shaft member 5 is inserted into the metal bush 7 in a tight fitting state, and inserted into the inner cylinder 31. The flange 51 of the shaft member 5 and the metal bush 7, and the metal bush 7 and the bottom panel 11 of the side frame 1 are welded.

The rubber bush device 3 and the side frame 1, which are connected to the sub-frame 2, connect the receiving plate member 4 disposed below the device 3 with the pipe nut 52 of the shaft member 5 inserted into the inner cylinder 31. Bolt 6 penetrated from below
Is screwed into the pipe nut 52 to be joined. Thus, the inner cylinder 31 of the rubber bush device 3 is fixed to the side frame 1, and the subframe 2 is fixed to the outer cylinder 32 connected to the inner cylinder 31 via the vibration-proof rubber body 33. Become.

In the frame mounting structure constructed as described above, the joint between the flange portion 51 of the shaft member 5 and the periphery of the hole 12 of the side frame 1 includes the engine and tires in addition to the weight of the subframe 2. The vibration of the sub-frame transmitted from the road surface through the air acts intensively.

[0019] In this structure Thus, the shaft member 5 and the side off
The contact area of the frame 1 around the hole 12 is increased by interposing the flange 72 of the metal bush 7 between the collar portion 51 and the periphery of the hole 12, and the outer periphery of the shaft member 5 and the hole 12 are Since the contact area with the opening edge is increased by interposing the cylindrical portion 71 of the metal bush 7, the torsional force due to the vibration acting on the side frame 1 around the hole 12 is reduced. Therefore, the same effect as that obtained by widening the flange portion 51 and increasing the panel thickness of the side frame 1 is exhibited.
Deformation around the hole 12 of the side frame 1 and generation of a crack are prevented. Therefore, since the flange portion 51 of the shaft member 5 can be narrow, the workability of the shaft member 5 is also improved.

FIG. 2 shows another embodiment, in which a shaft member 5A has a bolt 53 at the tip. The distal end is made to penetrate the receiving plate member 4 downward, and a nut 6A as a fastening member is tightened from below the receiving plate member 4. Other structures are substantially the same as those of the previous embodiment, and the description is omitted. This embodiment also has the same operation and effect as described above.

[0021]

According to the present invention, the shaft member is penetrated through the hole formed in the side frame of the vehicle, and the collar formed on the outer periphery of the shaft member is locked around the hole of the side frame. In the structure that supports the sub-frame on which the engine, etc. are mounted via the rubber bush device, without expanding the above-mentioned flange part, and without increasing the thickness of the side frame panel, deformation and cracks around the holes in the side frame can be prevented. Generation can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a sub-frame mounting portion according to the present invention.

FIG. 2 is a cross-sectional view showing another structure of a mounting portion of a subframe according to the present invention.

FIG. 3 is a perspective view showing a front side frame and a subframe to which the present invention is applied.

FIG. 4 is a cross-sectional view showing a structure of a conventional sub-frame mounting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front side frame 12 hole 2 Subframe 3 Rubber bushing device 31 Inner cylinder 32 Outer cylinder 33 Anti-vibration rubber body 4 Receiving plate member 5 Shaft member (pipe nut) 5A Shaft member (bolt) 6 Fastening member (bolt) 6A Fastening member (Nut) 7 Metal bush 71 Tube part 72 Flange

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 21/00 B62D 24/02

Claims (3)

(57) [Claims] 1. A structure in which a cross-shaped sub-frame for supporting an engine or the like is mounted under a pair of left and right front side frames extending in the front-rear direction of a vehicle, wherein the front side frame and a receiving plate member are connected by a rubber bush. With the inner cylinder of the device facing up and down, a bar-shaped shaft member with a flange formed on the outer periphery is inserted into the inner cylinder from the hole provided in the front side frame, and the collar is turned around the hole around the hole. The inner cylinder is fixed to the side frame by being screwed to the side frame, and the tip of the shaft member and the fastening member locked to the receiving plate member are screwed together. In the frame mounting structure for a vehicle in which the sub-frame is fixed to the outer cylinder of the rubber bush device described above, a metal bush having one end formed with a flange having a diameter larger than that of the flange portion. Fit the cylindrical part into the hole of the front side frame, insert the shaft member into the cylindrical part and lock the collar part and the part around the hole of the front side frame via the metal bush. Frame mounting structure for vehicles. 2. The vehicle according to claim 1, wherein the shaft member has a pipe nut formed at a tip thereof, and the fastening member is a bolt that penetrates the receiving plate member and has the tip screwed to the pipe nut. Frame mounting structure. 3. The shaft member according to claim 1, wherein the shaft member is a bolt having a threaded outer end penetrating the receiving plate member, and the fastening member is a nut screwed to the rod end. Vehicle frame mounting structure.