JPS6313984Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for bolting and fixing a spare tire to the floor of an automobile, and is aimed at damping vibrations at the spare tire mounting portion.

A common mounting structure for a spare tire is to provide a chevron-shaped protrusion on the floor of a trunk room, and to fix the spare tire wheel to the protrusion by tightening bolts through a wheel hole formed in the center. By the way, when a vehicle is running, vibrations from the road surface are transmitted to the floor panel through tires and a cross member, and since floor panels are generally thin, they tend to vibrate, which may cause noise generation. Measures to prevent this noise include increasing the thickness of the floor panel or adding an asphalt sheet, but this increases the weight of the body and increases costs.

Therefore, in the present invention, a reinforcing plate is placed on the floor with one end positioned directly above the cross member on the horizontal part of the floor, and the other end positioned on the inclined surface of the protruding part of the floor, and the reinforcing plate is placed on the floor, and the reinforcing plate is placed on the floor with one end positioned directly above the cross member on the horizontal part of the floor. By positioning the outer circumference on the reinforcing plate and tightening bolts at the center of the spare tire wheel, the spare tire mounting structure simultaneously presses and fixes both ends of the reinforcing plate to the floor via the outer circumference of the spare tire wheel. It accomplishes its purpose.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

As shown in Figure 1, 1 is the floor panel of the trunk room, and there is a recess 1 in the spare tire mounting area.
1 is formed, and the central portion of the recess 11 is formed with a gently sloped conical chevron-shaped protrusion 12, and a spare tire fixing fitting 2 is fixed to the top of the protrusion 12. Reference numeral 3 denotes a spare tire (for emergency use), which is fastened to the metal fitting 2 with wing bolts 4 in a wheel hole formed in the center of a tire wheel 31. The floor panel 1 is the horizontal part in front of the vehicle where the spare tire is attached, and the rear wheel (not shown)
It is supported by a cross member 5 connected to.

As shown in FIGS. 1 and 2, a reinforcing plate 6 is placed on the floor panel 1 with one end positioned directly above the cross member 5 and the other end positioned on the inclined surface of the protrusion 12. There is. An edge portion 32 protruding from the outer periphery of the wheel 31 is positioned on the reinforcing plate 6. As the reinforcing plate 6, either a synthetic resin plate or a metal plate may be used. Also,
A cushioning mat 7 is provided on the rear side of the spare tire mounting portion of the floor panel 5. This mat 7 is connected to the protruding edge portion 32 of the wheel 31.
This is a conventionally well-known mat used to prevent scratches caused by contact between the floor panel 1 and the floor panel 1.

Thus, the spare tire 3 is tightened and fixed to the metal fitting 2 by the butterfly bolt 4, and at the same time, part of the edge part 32 of the wheel 31 is pressed against the reinforcing plate 6, and the other part of the edge part 32 is pressed against the mat 7.
pressed against. Both ends of the reinforcing plate 6 are firmly pressed against the floor panel 1 by bolting.

By the way, in the conventional mounting structure, a mat was interposed between the wheel and the floor as described above, but this was for the purpose of preventing scratches, and it was also made of a soft cushioning material that was not suitable for the floor. The panel had no vibration damping effect at all.
The present invention uses a hard reinforcing plate instead of the mat, and firmly presses and fixes it to the cross member support part of the floor panel with the wheel of the spare tire, thereby strengthening the rigidity of the floor panel, especially the vibration input part. The spring constant has been increased to achieve a damping effect.

Figure 3 shows the sound pressure level in the rear seat of a car for the spare tire mounting structure using a reinforcing plate according to the present invention (line a) and the conventional spare tire mounting structure using only mats (line b). It can be seen that noise can be prevented by the present invention.

In addition, the reinforcing plate used in this invention has a length and width of 100 mm to 300 mm.
mm is sufficient, and the increase in vehicle weight and cost is minimal.

The present invention is particularly advantageous when applied to a spare tire mounting structure in which the edge of the tire wheel protrudes, such as a commonly used emergency spare tire.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Fig. 1 is a longitudinal cross-sectional view of the mounting structure, Fig. 2 is a plan view, and Fig. 3 is a comparison of sound pressure levels between the mounting structure of the present invention and the conventional mounting structure. It is a figure showing a comparison. 1...Floor panel, 12...Protrusion, 3...
Spare tire, 31... Spare tire wheel, 5... Cross member, 6... Reinforcement plate.

Claims (1)

[Scope of utility model registration request] In a spare tire mounting structure in which a part of the automobile floor protrudes in a chevron shape and the center of the spare tire wheel is bolted to the top of the protrusion, a reinforcing plate is attached to the floor horizontally with one end supported by a cross member. The spare tire wheel is placed directly above the cross member of the protrusion, and the other end is placed on the inclined surface of the protrusion, and the spare tire wheel is placed on the floor, and the outer circumference of the spare tire wheel is placed on the reinforcing plate, and the bolt is tightened. A spare tire mounting structure in which both ends of the reinforcing plate are pressed and fixed onto the floor via the outer periphery of the spare tire wheel.