JPS6132179Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite leaf spring in which a main leaf spring made of spring steel and an auxiliary leaf spring made of fiber-reinforced plastic are superimposed.

For example, as a leaf spring for automobile axle suspension,
Generally, leaf springs made of spring steel are used.
However, in recent years, efforts have been made to reduce the weight of leaf springs, contributing to improved fuel efficiency, and at the same time, composite leaf springs, which have sufficient strength and are highly productive, have been developed. Composite leaf springs made by overlapping the above are attracting attention.

This composite leaf spring is connected to the vehicle body through eyelets provided at both ends of the main leaf spring, for example, by pins fixed to the vehicle body, and on the other hand, suspends the axle at its central portion.

By the way, in the aforementioned composite leaf spring, the end face of the auxiliary leaf spring is easily damaged due to road surface interference caused by flying stones, curbs, wheel derailment, etc., and this damage promotes fatigue of the auxiliary leaf spring. There is a risk.

Furthermore, since stress is concentrated near the eye of the main leaf spring, it is possible that the main leaf spring may break. However, with the auxiliary leaf spring made of fiber-reinforced plastic, the same measures as spring mounting cannot be taken in terms of strength, and the danger of breakage cannot be avoided.

Therefore, the purpose of the present invention is to provide a composite leaf spring that can prevent the end face of the auxiliary leaf spring from being damaged by flying stones or road surface interference, and can also avoid danger even if the main leaf spring near the center part breaks. be.

The composite leaf spring of the present invention has a protector whose one end is wound around the outer periphery of eyeballs provided at both ends of the main leaf spring and held, and whose other end extends beyond the end face of the auxiliary leaf spring to the bottom surface. and a clip that fixes the other end of the protector and surrounds and fixes the auxiliary leaf spring and the main leaf spring.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the composite leaf spring 10 of the present invention is used by being attached to, for example, a vehicle body 12 of an automobile. The composite leaf spring 10 is connected to the vehicle body 1 at its front end.
An axle 20 mounted at the center is suspended on a bracket 14 provided on the vehicle body 2, which is swingably connected at its rear end to a bracket 18 provided on the vehicle body 12 via a shackle 16.

As shown in FIG. 2, the composite leaf spring 10 includes a main leaf spring 22 made of spring steel, and an auxiliary leaf spring 24 made of fiber-reinforced plastic stacked below the main leaf spring 22.

Each end of the main plate spring 22 in the longitudinal direction has an eyepiece 2.
6 is provided, and the composite leaf spring 10 is connected to the vehicle body 10 as described above by means of a pin passing through the eyelet portion 26.

The auxiliary leaf spring 24 is formed shorter than the main leaf spring 22, and its end surface 28 is located below the centerpiece 26. A tapered surface 36 is provided on a portion of the lower surface 29 of the auxiliary leaf spring 24, and the thickness of the auxiliary leaf spring 24 gradually decreases toward the end surface 28.

The composite leaf spring 10 of the present invention includes a metal protector 30 and a metal clip 32.

An upper end portion 33, which is one end portion of the protector 30, is wrapped around the outer periphery 27 of the eyeball portion 26 and held therein.
In this case, in order to prevent the protector 30 from vibrating during use, the upper end portion 33 is preferably shaped to slightly tighten the outer periphery 27 of the eyeball portion 26 due to its elasticity. The upper end portion 33 is the eyeball portion 2
6, the main leaf spring 22 is hooked to the center portion 26.
When the eyepiece breaks near the
Holds the composite leaf spring 10. Therefore, as shown in the figure, it is preferable that the shape is such that it is in close contact with the outer periphery 27 over 180 degrees or more of the outer periphery 27 of the eyeball portion 26. The length of the upper end portion 33 in the width direction of the eyeball portion 26 is the same as the width of the eyeball portion. The protector 30 has an intermediate portion 34 and an outer circumference 2 of the eyeball portion 26.
7 and continues to the other end, the lower end 35. This lower end portion 35 is the end surface 2 of the auxiliary leaf spring 24.
8 to the lower surface 29, and extends from the tapered surface 36 of the lower surface to the horizontal surface 37. The lower end portion 35 is formed in close contact with the lower surface 29 of the auxiliary leaf spring 24.

In the illustrated example, the clip 32 is formed integrally with the lower end 35 of the protector 30 and fixes the lower end 35 of the protector 30. Both ends 38 and 39 of this clip 32 are as shown in FIG.
It surrounds the auxiliary leaf spring 24 and the main leaf spring 22, is bent above the main leaf spring 22, and is fixed by caulking. In this case, it is preferable to interpose a rubber plate 40. In the illustrated example, the clip 32
also serves as a clip that connects the main leaf spring 22 and the auxiliary leaf spring 24. Although this is preferable in terms of saving parts, it is more convenient to provide the clips separately, such as when constructing an existing composite leaf spring in accordance with the present invention. In this way, clip 3
2 may be formed integrally with the clip originally provided on the composite leaf spring 10, or may be formed separately. This clip 32 and the upper end 3 of the protector 30
3, even if the main leaf spring 22 is broken near the center portion 26, the composite leaf spring 10 is held at the attachment point. Since such a broken point can be identified empirically or experimentally, the mounting position of the clip 32 is determined so that this broken point is closer to the eyepiece 26 than the clip 32 is.

According to the present invention, the protector protects the end face of the auxiliary leaf spring that constitutes the composite leaf spring, so that the end face is not damaged by flying stones or road surface interference, which causes fatigue of the auxiliary leaf spring. There is no such thing as Moreover, the upper end of this protector is wrapped around the outer circumference of the eye of the main leaf spring and is held, and the lower end of the protector is fixed to the main leaf spring and the auxiliary leaf spring with clips, so that the vicinity of the eye of the main leaf spring is Even if it were to break, the composite leaf spring would remain in place and the danger would be avoided.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a part of a car body equipped with the composite leaf spring of the present invention, Fig. 2 is a side view showing the main parts of the composite leaf spring of the present invention, and Fig. 3 is 3-3 in Fig. 2. It is a 3-line sectional view. 10: Composite leaf spring, 12: Vehicle body, 20: Axle,
22: Main leaf spring, 24: Auxiliary leaf spring, 26: Eyepiece, 27: Outer periphery, 28: End face, 29: Bottom face, 3
0: protector, 32: clip, 33: upper end, 35: lower end.

Claims (1)

[Scope of utility model registration request] A composite leaf spring comprising a main leaf spring made of spring steel having eyelets at both ends in the longitudinal direction, and an auxiliary leaf spring made of fiber-reinforced plastic overlapped and bonded to the lower side of the main leaf spring, the composite leaf spring having one end. a protector whose part is wound around the outer periphery of the eyepiece part and whose other end part extends beyond the end face of the auxiliary leaf spring to the lower surface; and a clip fixed around the main leaf spring.