JPS5854242A - Leaf spring of fiber reinforced plastics - Google Patents

Abstract

PURPOSE:To perform reduction of number of part items, weight decrease, cost down, etc. of a leaf spring, by forming the leaf spring through the integral molding with the mounting part of an axle and the like as the center. CONSTITUTION:A mounting part 1a of a trunnion shaft 2 is formed as a center thickness paddy part 1b, and plural leaf springs 1c of fiber reinforced plastics (FRP) are extensibly molded from said center thickness paddy part 1b laterally as an integral unit. Accordingly, the necessity for parts of U-bolt, pad, trunnion sheet, etc. can be eliminated, in this way, reduction of number of part items, weight decrease and cost down can be performed.

Description

Detailed Description of the Invention The present invention relates to a fiber-reinforced resin plate spring, and in particular to a fiber-reinforced resin plate that eliminates the need for U-bolts, pads, trunnion sheets, etc. when attaching the spring to an axle or trunnion shaft. In the case of conventional laminated steel plate springs, the mounting part of the axle trunnion shaft is
Since the tightening was fixed by members such as bolt hats and trunnion sheets, there were disadvantages such as a large number of parts, large weight, high cost, and a large number of assembly steps. In addition, the part that is tightened with the U bolt does not function effectively as a leaf spring, so the effective volume as a leaf spring is small as the weight is large. This tendency was significant because of the long In particular, if a fiber-reinforced resin leaf spring is used in a trunnion-type spring with such a conventional structure, a large amount of expensive material will not be effectively utilized as a spring, resulting in a large amount of waste.

The present invention has been made in order to eliminate the drawbacks of the prior art described above, and its purpose is to take advantage of the fact that a leaf spring made of fiber reinforced resin can be integrally molded, so that the attachment part of an axle or trunnion shaft can be By forming a stacked leaf spring by integrally molding the center, parts such as U-bolts, pads, and trunnion sheets are no longer required, and this also reduces the number of parts, reduces weight, and
The aim is to reduce costs and assembly man-hours.

Another purpose is to increase the portion that effectively functions as a leaf spring by eliminating the portion that is tightened by the U-bolt.

In short, the present invention is characterized in that the mounting portion of the axle, trunnion shaft, etc. is formed as a central built-up part, and a plurality of leaf springs are molded to extend left and right from the central built-up part. .

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings, and was carried out with respect to a plate-making blade 1 (referred to as P). The mounting portion 1a of the trunnion shaft 2 is formed as a center build-up portion 1b, and a bearing member 3 such as a bearing or bushing is attached to the center portion by adhesive or integral molding. A plurality of FRP plate springs lc are integrally molded to extend left and right from the central fleshy part lb. The leaf springs Ic are aligned in the horizontal direction with gaps between them, and the length f becomes shorter as they go upward. In addition, by changing the thickness of the central built-up portion 1b in the radial direction, each leaf spring IC
The length that effectively acts as a blade changes. The lowest plate spring 1c is slidably mounted on a support member 5 on the rear first axle 4 and a support member 7 on the rear twenty-seventh axle 6. Referring also to FIG. 2, the bearing member 3 is rotatable with respect to the trunnion shaft 2, and the trunnion seat is fixed to the frame 9 via the trunnion bracket 8. He is tied up by Natsume 10. However, the method of restraining the bearing member 3 is not limited to the illustrated method.

In addition, in Figure 1, 11, 12, 13 and 14 rod rods, 15ti) rod rod mounting brackets, 1
This is a side member of the 6U frame 9.

Next, the second embodiment of the present invention shown in FIG. 21f is for a normal vehicle leaf spring attached to the bracket 24 via the shackle 23, and as in the first embodiment, the attachment part 21 of the axle 25
a is formed as a center build-up part 21b, and the center build-up part 21
A plurality of FRP leaf springs 21C are integrally molded from left to right from b, and the axle 25 is fixed by adhesive or integral molding. Each leaf spring 2IC has both ends 21d
, 21f are in contact with each other.

Note that 9 is a frame to which plaquettes 22 and 24 are fixed.

The present invention is configured as described above, and its operation will be explained below. First of all, if you are wondering about the first embodiment shown in FIGS. 1 and 2, the bottom plate 1 of the spring 1 is attached to the FRP plate from the rear first axle 4 and second axle 6.
When an upward bending load is applied to c, the leaf spring IC first bends, and when a stiffness of more than a certain value is generated, it comes into contact with the leaf spring IC above it, and the core leaf spring also bends. Thereafter, the spring constant is gradually increased as the upper leaf spring IC is successively brought into contact with the upper leaf spring IC in the same manner. This is because the number of leaf springs IC that causes deflection increases, and the span of the spring Ic on the plate becomes shorter toward the top.As a result, even though the integrally molded FRP leaf spring 1 is supported, non-linear loads - Deflection characteristics can be obtained. In addition, when a load is applied in the opposite direction to the first axle 4 and the second axle 6, the baffle plate flies off (1ti) Runion shaft 2
Rotates around the center.

In addition, in order to attach the FRP plate spring l, simply attach the bearing part 3.
It is only necessary to fit the trunnion shaft 2 into the trunnion shaft 2 and restrain it in the axial direction with the nuts 10, and there is no need to tighten it with U bolts as in the conventional example, and the structure and installation are both simple.

Next, the second embodiment shown in FIG. 3 will be explained. In this case as well, the tightening of the FRP leaf spring 21 by the U bolt serves as a lower cover, and when an upward bending load is applied from the axle 25, the Fitp leaf spring 21 is tightened by the U bolt. The spring 21 bends upward and absorbs the impact.

Since the present invention is configured as described above and operates f1, it takes advantage of the fact that the FRP plate springs can be integrally molded, and the stacked plates are integrally molded mainly around the attachment parts of the axle and trunnion shaft. Since dne was formed, Uporto,
It is an advantage that parts such as nokurado and trunnion sheets can be eliminated, resulting in a reduction in the number of parts, weight reduction, cost reduction, and reduction in assembly man-hours.
’ effect can be obtained. Since the part that is tightened by IcU bolts can be eliminated, the part that effectively acts as a leaf spring can be increased, and expensive FRP can be removed.
This has the advantage of preventing wasteful use of accumulated profits.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention; FIG. 1 is a side view when the present invention is applied to a trunnion type leaf spring, FIG. 2 is a longitudinal cross-sectional view of the trunnion shaft portion of the same as shown in FIG. The figure is a side view showing the case where the present invention is implemented in a common board support for a vehicle. 1.21 is FRP spring, Ia, 21a is axle,
Installation Llb of trunnion shaft, etc. Reference numeral 21b designates plate ridges at the center build-up portions JC and 21C, 2 designates a trunnion shaft, and 25 designates an axle. Patent Applicant Hino Jikyo Kogyo Co., Ltd. Agent Patent Attorney Kazuo Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A fiber-reinforced resin board characterized in that a mounting part for an axle, a trunnion shaft, etc. is formed as a central built-up part, and a plurality of leaf springs are molded to extend left and right from the central built-up part.