JPS60229812A - Frp leaf spring mechanism for car suspension - Google Patents

Abstract

PURPOSE:To prevent a main leaf from wearing and to obtain the variable rate property of which spring constant gently rises by providing elastic objects between the face at the side of leaf tensile stress and the car body side member opposed to this face in the captioned mechanism of laminated spring type. CONSTITUTION:When a downward load is acted on spring eyes 2, a main leaf 1 alone deflects while the load is small, and the deflection of the main leaf 1 increases with increasing load with the result that the distance between a car body side member 5 and the leaf spring mechanism is shorten and finally an elastic object 10 and 11 are contacted with a contact plate 15 and 16 respectively. Consequently the increase of load after this causes also a leaf 7 to deflect and the spring constant to rise. This constitution allows the spring constant to rise gently with the result that the variable rate property can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a parent-child spring type FRP leaf spring device for suspension of a vehicle Ilj.

(Technical background of the invention and its problems) Using a spring plate made of FRP (Yumimo fiber-reinforced synthetic resin)
The RP temporary spring device is considered promising as a suspension device due to its light weight, but one of its drawbacks is that it is susceptible to friction. This shortcoming is W? As a way to solve this problem, it was considered to interpose a spacer or an elastic body between multiple FRP spring plates, but in this case, the concentrated load would not be applied to the part where the main plate comes into contact with the elastic body, etc. It is also possible that the main plate may wear out and lead to serious defects.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to provide a vehicle suspension system that can prevent problems such as wear and has non-linear characteristics such that the spring constant increases smoothly. An object of the present invention is to provide an FRP temporary spring device.

[R Summary of the Invention] The gist of the present invention is to provide a parent-child spring type FRP leaf spring device comprising a parent plate made of FRP and a child plate made of FRP arranged on the tensile stress side of the parent plate. , an elastic body made of, for example, rubber, urethane foam, or other material is attached to at least one of the surfaces, located between the surface on the tensile stress side of the child plate and the member on the vehicle body side opposite to this surface. There is a particular thing.

According to the above combination, the elastic body does not come into contact with the main plate,
Therefore, wear of the main plate can be prevented. Moreover, since it is a parent-child spring type, as the load increases, the daughter plate flexes together with the parent plate, resulting in nonlinear characteristics.In this case, the daughter plate flexes through the elastic body, so the spring constant clearly increases. It has 19 nonlinear characteristics.

(Embodiments of the Invention) A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, numeral 1 indicates a parent plate made of FRP. This main plate 11 is made of reinforced eA fibers hardened with a matrix resin in the same way as a normal FRP spring plate. Eye members 2, 2 for connection to the vehicle body are attached to both ends of the main plate 1 using fixing devices 3, such as bolts or rivets, and a seat plate 4. Since the eyepiece member 2.degree. 2 is mainly subjected to a downward load in the drawing when attached to the vehicle body, the upper surface side 1j of the main plate 1 becomes the tensile stress side, and the lower surface side becomes the compressive stress side.

Reference numeral 5 indicates a member on the vehicle body side, for example, a vehicle body frame.

An FRPH child plate 7 is arranged on the tensile stress side of the parent plate 1, and the combination of the parent plate and the child plate 7 constitutes a parent-child spring type FRP leaf spring device. The main plate 1 and the daughter plate 7 are restrained to each other by a center bolt (not shown) at an intermediate portion in the longitudinal direction, and an axle 9 is fastened using U bolts 8 . . . .

An elastic body 10.1 is located between the surface of the child plate 7 on the tensile stress side and the member 5 on the vehicle body side opposite to this surface.
1 is provided. In this example, the elastic body 10.11
are attached to both ends of the daughter plate 7 via plates 12 and 13. As the material of the elastic body 10.11, for example, an elastic material such as urethane-based synthetic resin foam or rubber can be used.

Contact plays 115 and 16 are provided on the vehicle body side member 5 at positions facing the elastic parts 1t110 and 11, respectively.

The above installation is temporary 12.13 is the child plate 7 of the elastic body 10.11
It has a wider area than the side surface, and the elastic body 10.11
The reaction force received when the contact plate 15, 16 comes into contact with the contact plate 15, 16 is dispersed and transmitted to the daughter plate 71illI. Although bolts or nuts may be used to attach the temporary parts 12 and 13 to the daughter plate 7, it is preferable to use adhesive to avoid drilling holes in the daughter plate 7. In order to fix the elastic body 10.11 to the plate 12.13, a pole, rivet, etc. may be used, or adhesive may be used.

In the parent-child spring type FRP temporary spring device configured as described above, a downward load as shown in the figure is applied to the centerpiece members 2, 2.
While this load is small, only the main plate 1 flexes, but as the load increases and the flexure of the main plate 1 increases, the distance between the member 5 on the vehicle body side and the leaf spring device becomes pinched, and finally the elastic body 10 .11 contacts contact 1-plate 15.16. When the load further increases, the elastic body 10.11 bends under the compressive load, and the daughter plate 7 also bends.

For this reason, the spring constant becomes high, but the child plate 7 is an elastic body 10.
Because it bends through 11, there is a real 1 in Figure 2! As shown by A, a nonlinear characteristic in which the spring constant increases smoothly is obtained. In the same figure, the broken line B indicates the case where it is assumed that the elastic body 10.11 is not used, resulting in a nonlinear characteristic in which the spring footrest suddenly rises.

Incidentally, as shown by numeral 115' in FIG. 1, the warp of one contact plate 15 may be increased to narrow the distance between it and the elastic body 10. In this case, when the main plate 1 is bent, initially only one elastic body 10 is attached to the contact plate 1.
However, as the load increases, the other elastic body 11 also comes into contact with the contact plate 16, resulting in a more pure nonlinear characteristic as shown by the imaginary line C in FIG. According to the above-mentioned plate splash device, the elastic body 1
0.11 is a value that does not contact the main plate 1, so that wear of the main plate 1 can be prevented.

FIG. 3 shows a second embodiment of the invention. In this case, the elastic body 10.11 is attached to the member 5 on the vehicle body side, and a wear prevention means 20.20 is provided on the tensile stress side surface of the daughter plate 7 facing the elastic body 1o, ii. As the wear prevention means 20.20, for example, a metal bending plate, rubber, synthetic resin plate (including FRP), etc. may be attached to the end of the child #i7, or a fabric may be attached to the surface of the child plate 70. Abrasive fibers may be arranged to increase the strength against abrasion. Further, the second storage plate 25 or the third plate (not shown) may be stacked on the compressive stress side surface of the main plate 7.

Even in such a second embodiment, nonlinear characteristics substantially equivalent to those of the first embodiment can be obtained. Further, as shown by the imaginary line 10' in FIG. 3, by making the insularity of one elastic body 10 higher than that of the other elastic body 11, smoother nonlinear characteristics can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, in a parent-child spring type leaf spring device using FRP spring plates, smooth nonlinear characteristics can be obtained, and the elastic body does not come into contact with the parent spring, so that the WI plate It is highly effective in preventing wear.

[Brief explanation of drawings]

Fig. 1 is a front view of a leaf spring device showing a first embodiment of the present invention, Fig. 2 is a spring characteristic diagram of the same leaf spring device, and Fig. 3 is a front view showing a second practical example of the invention. be. 1... Main plate, 5... Vehicle body side member, 7... Child plate, 1
0゜11...Elastic body, 12.13...Mounting to plate, 2
0... Wear prevention means. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] <1> Parent-child spring type FRP comprising a parent plate made of FRP and a child plate made of FRP arranged on the tensile stress side of the parent plate.
In the plate spring device, an elastic body is attached to at least one of the surfaces of the child plate, the elastic body being located between the surface on the tensile stress side of the child plate and a member on the vehicle body side opposite to this surface. FRP leaf spring device for color suspension. (2) Claim (1) characterized in that the elastic body is attached to the member on the vehicle body side, and a wear prevention means is provided on the tensile stress side surface of the daughter plate facing the elastic body.
FRP leaf spring device for vehicle suspension as described in .