JPS5834244A - Laminated spring - Google Patents

Abstract

PURPOSE:To increase strength per unit weight of a laminated spring made of fiber reinforced resin (FRP) by providing steel leaf springs built in and secured fixedly to the central portion of the laminated spring in the direction of the thickness, both ends of the steel leaf springs being protruded from both ends of FRP leaf springs and contacting with each other. CONSTITUTION:This laminated spring comprises a plurality of FRP leaf springs 1, 1 having different lengths and steel leaf springs 2 interposed between said FRP leaf springs 1, 1 and fixedly arranged on the central position and in the direction of the thickness of the FRP leaf springs 1. The respective leaf springs 2 have lengths protruding from both ends 1a of FRP leaf springs 1. The uppermost leaf spring 2 is formed in both ends 2a with eyeends 2b and the remaining springs 2 have both ends 2a bent upward and rebent horizontally so that adjacent leaf springs 2 contact with each other on both ends 2a. Thus, FRP leaf springs 1 do not contact with each other to improve anti-wear property while increasing strength per unit weight of the laminated spring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stacked plate spring, and in particular, provides a stacked plate made of fiber reinforced resin with a built-in steel plate spring, in which the shore abrasion resistance K is made to depend exclusively on the steel plate spring. Regarding springs.

In the past, many leaf springs made of fiber-reinforced resin have been proposed, but these leaf springs have much higher strength per unit weight than leaf springs made of steel, so it is difficult to find a leaf spring with the same strength. This has the advantage of allowing considerable weight reduction, but on the other hand, the hardness is small and the coefficient of friction is large, so it has the disadvantage of inferior wear resistance compared to steel plate springs, so it is still not practical. The current situation is that it cannot be provided.

The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to incorporate and fix a steel plate leaf spring into a fiber-reinforced resin leaf spring, and connect both ends of the fiber-reinforced resin leaf spring to the fiber-reinforced resin leaf spring. The fiber-reinforced resin leaf springs are made to protrude from both ends so that the steel plates come into contact with each other so that they do not come into contact with adjacent leaf springs. To provide a stacked leaf spring with high strength and quantity.

In short, the present invention incorporates and fixes a steel plate leaf spring in the longitudinal direction in the center of the fiber reinforced resin leaf spring, and connects both ends of the steel plate leaf spring from both ends of the fiber reinforced resin leaf spring. This is characterized in that the steel plates of adjacent leaf springs that are protruded and bent are brought into contact with both protruding ends, and the fiber-reinforced resins are configured so that they do not come into contact with each other.

The present invention will be explained below based on embodiments shown in the drawings. 1st
In the figure, a steel plate spring 2 is built in and fixed in the longitudinal direction of a fiber reinforced resin (hereinafter referred to as FRP) plate spring 1 in the thickness direction, and both ends 2a of the steel plate plate spring are made of FRP. It protrudes from both ends 1a of the plate spring 1, and the topmost one has both ends 2a formed as eyes 2b.
Other than this, both ends 2a are bent upward and then horizontally, and the steel plates of the adjacent leaf springs 1 are brought into contact with the protruding ends 2a, so that 4J and FRP come into close contact with each other. It is composed of

The FRP board 1 is formed as a laminate of IJ Fuchs resin and reinforcing fibers. Carbon fiber, glass fiber, or the like is used as the reinforcing fiber.

Carbon fiber reinforced resin (hereinafter referred to as CFRP) is mainly laminated inside except for the surface layer to provide strength against tensile and compressive stress caused by bending loads, and glass fiber reinforced resin (hereinafter referred to as GF RP) with high hardness is used in the surface layer. ) is used.

When the FRP leaf springs 1 are stacked, they are kept in a non-contact state by the spacer 3, and the center portion in the longitudinal direction is tightened and fixed to the center port 4 to form the stacked leaf spring 5. There is.

Also, when assembling it to the vehicle, the spacer 30 part should be
Strong tightening with bolts resists force and provides sufficient strength. The one shown in Fig. 1 is an FRP leaf spring 1.
Since the width of the steel plate spring 2 is the same as that of the steel plate spring 2, the side surface 2C of the steel plate plate spring 2 is visible over the entire length. It may be built in so as to be covered by the spring 1.

Next, the stacked leaf spring 6 shown in FIG. 2 differs from the steel plate spring 1 shown in FIG.
A steel plate leaf spring 2 formed as a long Cheeverly 7 spring with high strength and light weight is used as an FRP leaf spring 1.
The only difference is that the second embodiment is fixedly built into the second embodiment, and the other structure is the same as that of the embodiment shown in FIG.

The present invention is configured as described above), and its operation will be explained below.

When a bending load is repeatedly applied to the stacked leaf spring 5 or 6,
Each FRP leaf spring 1 and steel plate spring 2 repeatedly bends and expands and contracts, so both ends 2a of the steel plate leaf spring 2 slide while being pressed against the adjacent ends 2a, but the FRP
Since the leaf springs 1 do not come into contact with each other at all, the wear resistance is as good as that of the copper plate leaf spring 2.

Regarding bending strength, each leaf spring l is made of CFFRP and G
Since it is a composite body consisting of FRP, in which FRP and steel plates are laminated, it is lightweight yet has sufficient strength in all directions. A steel plate spring is built into the manufactured plate spring and is fixed, and both ends of the plate spring protrude from both ends of the FRP so that the steel plates come into contact with each other. Therefore, the FRP plate spring can be prevented from coming into contact with the plate spring that is in contact with it. As a result, it is possible to provide a stacked leaf spring that has high wear resistance, high strength per unit weight, and is lightweight.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention; FIG. 1 is a side view of a stacked leaf spring, and FIG. 2 is a side view of a stacked leaf spring according to another embodiment. 1 is a leaf spring made of FELr, 1a is both ends of a leaf spring made of FRP,
2a are both ends of the steel plate spring. Patent applicant Horikiri Spring Manufacturing Co., Ltd. Representative Patent attorney 1) Kazuo

Claims (1)

[Claims] A steel plate leaf spring is embedded and fixed in the longitudinal direction in the center of the fiber reinforced resin leaf spring in the thickness direction, and both ends of the steel plate leaf spring are
A stacked leaf spring characterized in that the fiber-reinforced resin leaf spring is made to protrude from both ends and is bent so that the steel plates of adjacent leaf springs are brought into contact with the protruding ends, respectively, so that the fiber-reinforced resins do not come into contact with each other. .