JPH10250620A - Mount structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mount structure of vehicle with which a coupling bolt at a vehicle body mounting part of a frame does not lose the coupling force momentarily, but slip off smoothly from the frame while it deforms a lower seat plate, when the middle part of the frame, in particular the lower part of the driver seat, is folded in V-shape in the event of a frontal collision of vehicle. SOLUTION: An isolator cylinder 7 penetrates an upper mount 5 pinched by a vehicle body and frame and a lower mount 15 contacted with the under- part of the frame, and a coupling bolt 2 is inserted in this cylinder 7 from the vehicle body side, and a nut 10 is screwed to the bottom of the bolt 2 so that the vehicle body is coupled with the frame. A conical part 7a whose outside diameter enlarges gradually toward the bottom is formed rigidly on the peripheral surface of the bottom contacting with the lower seat plate 9 of the cylinder 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle mounting structure in which a connecting bolt for fixing a vehicle body to a frame comes out of the frame when the vehicle collides, and only the frame is deformed to absorb the collision energy. is there.

[0002]

2. Description of the Related Art As shown in FIG.
The collision energy is absorbed at the front part of the frame 18, but the energy that cannot be absorbed is absorbed by the frame 18 being bent up and down by the bent portion 18a of the frame 18. With the vertical bending of the frame 18, the vehicle 1
The pulley 3 is pulled downward through a connection portion with the frame 18, and the vehicle body 13 assumes a forward leaning posture, and the vehicle body 13 is largely deformed.

In the vehicle mounting structure disclosed in Japanese Utility Model Laid-Open Publication No. 5-65761, at the time of a frontal collision of the vehicle, the connecting bolt is easily removed from the vehicle body mounting portion connecting the lower portion of the driver's seat of the vehicle body and the frame. This helps the frame absorb the impact and try to bend. That is, sandwich the upper mount between the bottom of the body and the frame, and apply the lower mount between the lower sides of the frame,
A separation tube (distance piece) penetrating the upper and lower mounts is interposed between the upper seat plate of the upper mount and the lower seat plate of the lower mount, and the connecting bolt is inserted into the separating tube from the vehicle body side, and the lower end of the connecting bolt Is fastened by screwing a nut. The lower seat plate is composed of an inner peripheral portion that is broken by an excessive load and an outer peripheral portion that reinforces the lower surface of the lower mount.

However, in the vehicle mounting structure described above,
It is difficult to set the breaking strength against the impact of the inner peripheral side portion of the lower seat plate, and the number of parts increases, which leads to an increase in the number of assembling steps and an increase in parts management costs. Once the inner peripheral part of the lower seat plate breaks, the coupling force of the connecting bolt is released instantaneously, which may cause a minor collision, and if the driver does not notice this, an unexpected accident may occur There is.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to mount a frame on a vehicle body when a front portion of the frame, particularly a lower portion of an engine room, is bent up and down due to a frontal collision of a vehicle. It is an object of the present invention to provide a vehicle mounting structure in which the connecting bolts of the parts do not lose the coupling force instantaneously, but are smoothly removed from the frame while deforming the lower seat plate.

[0006]

In order to solve the above-mentioned problems, the structure of the present invention comprises a separating cylinder penetrating an upper mount sandwiched between a vehicle body and a frame and a lower mount applied to a lower side of the frame. In a vehicle mounting structure in which a connecting bolt is inserted from the vehicle body side and a nut is screwed into a lower end of the connecting bolt, an outer diameter gradually increases toward a lower end side on an outer peripheral surface of a lower end portion in contact with a seat plate of the separation tube. The conical portion is formed integrally.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS By forming the lower end portion of a separation cylinder in a divergent conical shape, a connecting bolt can be stably removed from a vehicle body mounting portion of a frame. If the vehicle body and the frame can be stably separated at an appropriate timing, the influence of the vehicle body on the vertical bending mode of the frame can be minimized.

[0008]

1 is an exploded side view showing a vehicle body and a frame to show a vehicle body mounting portion to a frame according to the present invention, and FIG. 2 is a side sectional view showing a vehicle body mounting structure on a frame. The ladder-shaped frame 18 is provided with a plurality of vehicle mounting portions A at intervals in the front-rear direction, and the bottom plate 3 of the vehicle body 13 is connected to the connection bolts 2 (see FIG.
). In the illustrated embodiment, a horizontal mounting plate 8 is provided on the outer wall of the frame 18, and a cylindrical upper mount 5 and a lower mount 15 made of rubber are overlapped on both upper and lower surfaces of the mounting plate 8. Body 1 on top mount 5
The bottom plate 3 of the vehicle body 13 is overlapped, and a nut 10 is screwed and connected to a lower end portion of a connection bolt 2 penetrating the bottom plate 3 of the vehicle body 13, the upper mount 5, and the lower mount 15. The frame 18 has the lowest portion at the front and rear intermediate portion, the front end side is curved upward, and the rear end side is curved in an inverted U shape. Although not shown, frame 1
8, the width between the first and second vehicle body mounting portions A from the front in the illustrated embodiment is narrower.

As shown in FIG. 2, the flange 5a of the upper mount 5 is mounted on the upper surface of the mounting plate 8 of the frame 18, and the lower mount 15 is applied to the lower surface of the mounting plate 8. A small diameter portion 5b reinforced at the lower end of the upper mount 5 by a reinforcing cylinder 16.
Is formed, and the above-mentioned flange 5a is reinforced by the perforated flange 16a integral with the reinforcing cylinder 16. The reinforcing cylinder 16 made of metal or the like covers the outer peripheral surface of the small diameter portion 5b, and the flange 16a at the upper end of the reinforcing cylinder 16 is embedded in the flange 5a of the upper mount 5.

The small-diameter portion 5b of the upper mount 5 projects downward through the mounting hole 14 of the mounting plate 8 and is fitted into a cylindrical portion 15a provided at the upper end of the lower mount 15.
The seat plate 4 is joined to the upper end of the upper mount 5 by baking or the like, and the seat plate 9 is joined to the lower end of the lower mount 15. In order to restrict the interference between the upper mount 5 and the lower mount 15, a separation cylinder 7 penetrating the upper mount 5 and the lower mount 15 is interposed between the upper seat plate 4 and the lower seat plate 9.

According to the present invention, a conical portion whose outer diameter gradually increases toward the lower end, that is, a diverging conical portion 7a is integrally formed on the outer peripheral surface of the lower end portion of the separation cylinder 7.
In the vehicle body mounting portion A configured as described above, the seat plate 4 abuts on the bottom plate 3 of the vehicle body 13, preferably on a portion that is slightly recessed below the vehicle body bottom surface, and the connecting bolt 2 is moved from above the bottom plate 3. It is inserted into the separation cylinder 7 through the seat plate 12, the bottom plate 3, and the seat plate 4. A lower end of the connecting bolt 2 passes through the lower seat plate 9 and a nut 10 is screwed thereto. Thus, the connecting bolt 2 and the nut 1
0, the upper mount 5 is disposed between the vehicle body 13 and the frame 18 and the lower mount 15 is disposed between the frame 18 and the seat plate 9. 5 is compressed and deformed, and the mount 15 is compressed and deformed in response to the lifting of the vehicle body 13, thereby mitigating the impact transmitted to the vehicle body 13.

As shown in FIG. 4, at the time of a frontal collision of the vehicle, the front half of the vehicle, for example, the engine room is compressed and deformed, and accordingly, the frame 18 is bent downward at the lower portion 18a of the engine room. At this time, the connecting bolt 2 of the vehicle body mounting portion A comes out of the mounting hole 14 of the mounting plate 8, and the coupling force between the vehicle body 13 and the frame 18 is released, and the deformation of the frame 18 alone is assisted.

As shown in FIG. 3, the frame 18 is
When it is deformed downward with respect to 3, the connecting bolt 2 is relatively pulled up by the vehicle body 13. At this time, the lower mount 15 is damaged, and the peripheral portion of the lower seat plate 9 is deformed into a conical shape as shown in FIG. 3 and comes out from the mounting hole 14 of the mounting plate 8 upward.

In the present invention, in particular, a conical portion 7a is formed at the lower end of the separation cylinder 7, and the outer diameter d of the portion in contact with the lower seat plate 9 of the conical portion 7a is slightly larger than the outer diameter of the nut 10. I have. Accordingly, when the separation tube 7 is pulled up together with the connecting bolt 2, even if the separation tube 7 is eccentric with respect to the mounting hole 14, the conical portion 7 a engages with the rim of the mounting hole 14, and The lower seat plate 9 having a small thickness is deformed into a conical shape so as to enclose the nut 10 and smoothly comes out of the mounting hole 14.

[0015]

As described above, according to the present invention, a connecting bolt is inserted from the vehicle body side into a separation cylinder penetrating the upper mount sandwiched between the vehicle body and the frame and the lower mount applied to the lower side of the frame. In a vehicle mounting structure in which a nut is screwed into a lower end of a connecting bolt, a conical portion whose outer diameter gradually increases toward the lower end is integrally formed on an outer peripheral surface of a lower end in contact with a seat plate of the separation tube. With the deformation of the frame at the time of collision of the vehicle, the lower end conical portion of the separation tube is guided to the mounting hole of the frame together with the connecting bolt of the vehicle body mounting portion, and the seat plate of the lower mount is smoothly squeezed and the mounting hole is From the vehicle, and the binding force between the vehicle body and the frame is released. Accordingly, since the frame is bent without receiving the restraining force of the vehicle body, the collision energy is absorbed and the deformation of the vehicle body is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded side view showing a vehicle body and a frame to show a vehicle body attaching portion to the frame according to the present invention.

FIG. 2 is a side sectional view showing a mount structure of the vehicle.

FIG. 3 is a side view showing deformation of a vehicle body attaching portion at the time of a frontal collision of the vehicle.

FIG. 4 is a side view showing a deformation at the time of a frontal collision of the vehicle.

[Explanation of symbols]

A: Body mounting part 2: Connection bolt 3: Bottom plate 4: Upper seat plate 5: Upper mount 5a: Flange 5b: Small diameter portion
7: Separation cylinder 7a: Conical part 8: Mounting plate 9: Lower seat plate
10: Nut 12: Seat plate 13: Body 14: Mounting hole 15: Lower mount 15a: Cylindrical part 16: Reinforced cylinder
16a: flange 18: frame

Claims (1)

[Claims] 1. A connecting bolt is inserted from the vehicle body side into a separating cylinder penetrating an upper mount sandwiched between a vehicle body and a frame and a lower mount applied to a lower side of the frame, and a nut is attached to a lower end of the connecting bolt. In a vehicle mounting structure formed by screwing, a conical portion whose outer diameter gradually increases toward the lower end is integrally formed on an outer peripheral surface of a lower end in contact with a seat plate of the separation tube, wherein the mounting structure is a vehicle. .