JPS60231036A - Frp leaf spring device - Google Patents

Abstract

PURPOSE:To prevent a main leaf from wearing as well as to aim at the promotion of its lightweightiness, by attaching a couple of elastic bodies to the main leaf side as situated between the main leaf and an auxiliary leaf. CONSTITUTION:An auxiliary leaf 12 is disposed at the compressive stress side of a main leaf 10, while the overall length of the auxiliary leaf 12 is made to be shorter than that of the main leaf 10, and symmetrical spaces 15 and 15 are secured between the main leaf 10 and the leaf 12. And, a couple of elastic bodies 17 and 17 are installed on the mainlealf surface opposed to the auxiliary leaf 12, and these elastic bodies 17 and 17 are attached to the main leaf via each of adapter plates 18 so that sand or the like is in no case held in between the main leaf 10 and these elastic bodies 17 and 17, whereby wear in the main leaf is preventable from occurring and, what is more, the auxiliary leaf 12 being shorter than the main leaf is adoptable, thus lightweightiness as a whole is well promotable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an FRP leaf spring device including a parent plate and a daughter plate made of FRP.

[Technical background of the invention and its problems]

Leaf spring devices using spring plates made of FRP (fiber-reinforced synthetic resin) are considered promising for use in vehicle suspension because of their light weight, but one drawback is that they are susceptible to friction. For example, in the conventional example shown in FIG. 1, a spacer 3 is sandwiched between a main plate 1 and a daughter plate 2, and they are fastened together by a center gelt 4.
Elastic bodies 5, 5 are provided at both ends of the daughter plate 2, thereby preventing the mother plate 1 and the daughter plate 2 from coming into direct contact with each other to prevent wear. However, in this case, since the elastic bodies 5, 5 come into contact with the mounting plate 1, sand or the like gets caught between the elastic bodies 5 and the main plate 1, causing wear on the main plate 1, which can cause serious defects. Become.

On the other hand, in the conventional example shown in FIG.
Damage to the main plate 1 is prevented by bringing the metal eyepiece members 6 and 5 into contact with each other. But in this case,
The child board 2 is the same length as the main board 1, so it is lighter (Itoi 5
There's a problem.

[Purpose of the invention]

The present invention was made based on the above-mentioned circumstances, and its purpose is to provide an FRP leaf spring device in which the child plate is lighter than the main plate, which makes it easier to reduce the weight and prevent wear of the main plate. It is about providing.

[Summary of the invention]

The gist of the present invention is to provide a main board made of FRP, a child board which is also short in overall length and placed on the compressive stress side of the main board, and a space between the main board and the child board. and an elastic body located on the main plate side.

According to the above configuration, since the elastic body is attached to the main plate side, sand etc. will not get caught between the elastic body and the main plate, so it is possible to prevent wear of the main plate, and to protect the main plate. It is valid. Although there is a possibility that sand etc. may enter between the elastic body and the child plate,
Damage to the daughter plate is not a fatal defect. In addition, it is possible to use a shorter child plate than the main plate, which is advantageous in terms of weight reduction.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 10 in the figure is a main board made of FRP, and this main board 10
At both ends there are centerpiece members 11.1 for connecting to the vehicle body.
1 is installed. This parent plate 10 is made of reinforcing fibers hardened with IJ wax fat, similar to the well-known FRP spring plate. The eyepiece member 11.11 is mainly subjected to a downward load as shown in the figure when it is attached to a vehicle. Therefore, the upper surface side of the main plate 10 is on the tensile stress side, and the lower surface side is on the compressive stress side.

Further, a child plate 12 is arranged on the compressive stress side of the main plate 10.

This child plate 12 is fastened to the main plate 10 by a center port 14 via a center spacer 13. The child board 12 is also made of FRP H, but its total length is shorter than that of the main board 10, and there is a gap of 15.15 mm between it and the main board 10.
We are trying to ensure that.

Elastic bodies 17 and 17 are provided on the compressive stress side surface of the main plate 10, that is, on the surface facing the daughter plate 12. This elastic body 17.17 is connected to the main plate 10 through the mounting plate 18.18.
installed on. This mounting plate 18.18 has an area that is equal to or larger than the area of the surface of the elastic bodies 17, 17 on the main plate 10 side, and has an area that is equal to or larger than the area of the surface of the elastic bodies 17, 17 on the main plate 10 side, and the reaction when the elastic bodies 17.17 are compressed by the daughter plate 12. The force is dispersed and transmitted to the main board lO. This prevents concentrated loads on the main plate 10, smoothes stress distribution on the main plate 10, and improves durability. As the elastic body 17.17, it is preferable to use an elastic material such as urethane-based synthetic resin foam or rubber, but depending on the case, a coil spring made of metal or FRP may be used. Further, the mounting plates 18 and 18 may be attached to the main plate 10 using delts or rivets, but in order to avoid drilling holes in the main plate 10, it is preferable to fix them by adhesive. Note that the elastic body 17 may be fixed to the mounting plate 18 using delts, rivets, etc., or may be bonded.

Further, in this embodiment, as a preferable example, the elastic body 17.
Abrasion prevention means 20, 20 are provided on the surface of the tensile stress side of the daughter plate 12 in contact with the plate 17.

As this wear prevention means 20.20, for example, as conceptually shown in FIG. A woven reinforcing fiber may be arranged on the surface of this portion of the daughter plate 120 to increase the strength against wear.

In the FRP leaf spring device having the above configuration, only the main plate 10 is bent while the downward load applied to the eye member 11.
7 to contact the daughter plate 12, and as the elastic body 17.17 bends under the compressive load, the daughter plate 12 also bends.
Spring constant increases. That is, the elastic body 17. With the intervention of l'1, it is possible to obtain nonlinear characteristics in which the spring constant changes smoothly.

According to the FRP board springing device having the above configuration, the elastic body 17.1
7 is provided on the main plate 10I1111, there is no possibility of problems such as sand or the like getting caught between the elastic body 17 and the main plate 10 and damage to the main plate side, which is effective in protecting the main plate 10. It is. Moreover, the child board 12 is shorter than the main board 10.
9, it is easier to reduce the weight compared to the leaf spring device shown in FIG. 2, for example. Note that it is possible that sand or the like may enter between the elastic body 17 and the daughter plate 12, but in this case, even if the daughter plate 12 wears down to the extent that it does not, it will not cause a serious defect in the leaf spring device. Since this part is provided with wear prevention means 20, for example, the wear does not progress to the point where it becomes a practical problem.

FIG. 5 shows another embodiment of the invention.

In this case, for example, by making the heights of the elastic bodies 17.17 different from each other, the elastic bodies 17.17. ) 7 and the child plate 12 L1. L2 is made different. Furnace main board 1
When the deflection of 0 increases, first the distance L, [llI elastic body 1
7 contacts the daughter plate 12 and transmits the load to the daughter plate 12 side, and when the deflection increases further, the elastic body 17 on the distance L side also comes into contact with the daughter plate 12 and causes the daughter plate 12 to flex. Therefore, a nonlinear characteristic in which the spring constant increases smoothly can be obtained.

Other basic configurations and effects are the same as those of the first embodiment, so common parts are given the same reference numerals and explanations will be omitted. In addition, as a means for making the distances L1 and L2 different from each other, the curvature of the daughter plate 12 may be made different on the left and right sides. Furthermore, the present invention can of course be applied to an FRP leaf spring device having two or more child plates.

〔Effect of the invention〕

As described above, according to the present invention, by interposing the elastic body, direct contact between the main plate and the child plate is prevented, and by providing the elastic body on the main plate side, the main plate can be It is effective in protecting against wear, and the length of the child plate is shorter than that of the main plate, which is also advantageous in terms of weight reduction.

[Brief explanation of the drawing]

1 and 2 are front views showing a conventional FRP leaf spring device, FIG. 3 is a front view of an FRP leaf spring device showing an embodiment of the present invention, and FIG. 4 is a front view of a conventional FRP leaf spring device. FIG. 5 is a sectional view showing one embodiment, and FIG. 5 is a front view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Main board, 1)... Eyepiece member, 12... Child board, 17... Elastic member, 18... Mounting plate, 2o...
Anti-wear means.

Claims (3)

[Claims] (1) A main plate made of FRP, a five-point plate that is short in overall length and placed on the compressive stress side of the main plate, and a main plate located between the main plate and the child plate. An FRP leaf spring device characterized by comprising an elastic body attached to a board side. (2) The elastic body is attached to the main plate via a mounting plate having a larger area than the surface of the elastic body on the main plate side. FRP leaf spring device. (3) Abrasion prevention means is provided on the tensile stress side surface of the daughter plate that comes into contact with the elastic body.
The FRP leaf spring device according to item 1) or item (2).