JPS58142044A - Leaf spring made of fiber-reinforced plastic - Google Patents

Abstract

PURPOSE:To couple a leaf spring to a mounting member without performing cutting such as drilling in the end of the spring, by winding the end portion of the leaf spring made of fiber-reinforced plastic, as the plastic has not yet hardened, to secure a loop metal to provide the spring with a loop. CONSTITUTION:Before fiber-reinforced plastic F for making a leaf spring 11 has hardened, the end portion 11a of the spring is bent around a loop metal 12 to provide a loop 11c and the tip 11d of the end portion is put on the main portion 11e of the spring and clamped with a band 13 separately manufactured. An adhesive may be applied in between the tip 11d and the main portion 11e. A pin to be fitted in a mounting member such as a spring bracket and a shackle for a chassis frame is inserted into the loop metal 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber-reinforced resin leaf spring, and more particularly to a fiber-reinforced resin leaf spring that prevents the side surfaces of the end portions of the leaf spring from being worn out between mounting members such as spring brackets. Regarding.

Conventionally, in order to connect the leaf spring 1 made of 9-fiber reinforced resin to a mounting member such as a spring bracket or a shackle (not shown) to a chassis frame (not shown), for example, the first
As shown in Figures 2 and 2, a metal eye member 2 is manufactured separately and is fixed to the end of the fiber-reinforced resin leaf spring 1 using bolts and nuts (not shown). In addition, as shown in Figures 3 and 4, the metal eye member 3 on which a pair of reinforcing lips 3a are formed is similarly attached to the end of the fiber-reinforced resin leaf spring l using bolts, nuts, etc. According to such a conventional example,
Since it is necessary to drill holes to pass the bolts through, the reinforcing fibers, such as valuable carbon fibers, are cut at the holes, which can reduce the original strength of the reinforcing fibers. Furthermore, since the reinforcing fibers are very hard, machining is extremely difficult.

On the other hand, in order to eliminate such drawbacks, it may be possible to bend the end portion 1a of the fiber-reinforced resin leaf spring 1 in the same way as a steel leaf spring to form a centerpiece, but according to this method, If the end of the fiber-reinforced resin leaf spring, that is, the side surface of the center part, is misaligned in the axial direction, the side surface will be subject to severe friction with the mounting member such as the pull bracket. Since the spring is made of steel, the side surface of the end of the fiber-reinforced resin leaf spring wears out unilaterally, resulting in a drawback that it cannot be put to practical use.

The present invention has been made to eliminate the above-mentioned drawbacks of the prior art.
The purpose of this is to enable the end of a fiber-reinforced resin leaf spring to be connected to a mounting member for a spring bracket or shackle shank to a chassis frame without drilling or other cutting. The purpose of this is to apply pressure so that the fiber-reinforced resin leaf spring does not wear out unilaterally even if the end portion is subjected to severe friction with the mounting member, and this also increases the strength of the fiber-reinforced resin leaf spring. The objective is to prevent a decrease in the performance and facilitate manufacturing.

In short, the present invention provides an arrangement in which the side surface of the end of the plate and the mounting member are placed around a hole into which a bottle member attached to a mounting member such as a spring plug, a shackle, etc. to the chassis frame is inserted. It is characterized in that a metal eyepiece member having a radial bulge portion formed therein for preventing wear between the ends is built-in and fixed to the end portion.

The present invention will be explained below based on embodiments shown in the drawings. The fiber-reinforced resin plate spring 11 of the present invention will be explained based on the first embodiment shown in FIGS. 5 to 7. The internal parts are stuck. The eyepiece member 12 has an end portion of the leaf spring 11 around a hole 12a into which a pin member (none of which is shown) to be attached to a mounting member such as a spring bracket or a shackle to the chassis frame is inserted. Radial bulges E are formed on both sides to prevent friction between the side surface 11b and the mounting member. In this embodiment, the radial bulge portion E is formed as a pair of left and right disc-shaped seven-rank portions 12-b. In this case, the hole 12a may be formed with a bushing made of a plane metal, and the 7-rank portion 12b may be made of steel. Alternatively, the entire assembly may be made of steel, and a bushing made of plane metal may be press-fitted into the hole 12a.

The trap for fixing such a metal eye member 12 to the fiber-reinforced resin leaf spring 11 is to bend the end portion 111 of the fiber-reinforced resin #plant spring 11 before it hardens. Wrap it around the made eyepiece member 12 and make the eyeball part lie
It is sufficient to form the distal end portion lid on top of the main body portion lie, manufacture it separately, and tighten it with a safety band member 13. The band member 13 can be made of glass fiber, steel plate, etc., for example. Of course, it is also effective to inject adhesive into the contact surface between the tip portion lid and the main body portion lie. As described above, machining such as drilling is not necessary, and the fiber reinforced resin leaf spring 1
No. 1 reinforcing fiber F is cut. Note that the flange portion 12b is formed to have the same diameter as the eyeball portion 11C.

Next, a description will be given based on a second embodiment of the present invention shown in FIGS. 8 to 10. In this embodiment, the metal eye member 22 has a radial bulge E around the hole 22M. It consists of a cylindrical part 22b, a flat plate part 22C extending horizontally from the cylindrical part, and a seven-rank part 22d. The flat plate portion 22c is formed to be considerably thinner than the thickness of the main body portion 21e of the fiber-reinforced resin top plate spring 21, and its tip 226 has a sharp lower surface with a wedge-shaped slope.

This is to improve compatibility with the fiber-reinforced resin F and to alleviate sudden changes in stress values caused by the difference in Young's modulus between the fiber-reinforced resin F and the steel plate.

In this embodiment, the metal eyepiece member 22 first integrally molds a flat plate part 220 in fiber-reinforced resin F, and at this time wraps the end part 21a around the cylindrical part 22b to form the eyepiece part 210, and the tip part 21d. are stacked on the main body part 21e and fixed by tightening with two band members 13 similar to the band members 13 of the first embodiment.

Next, a description will be given based on a third embodiment of the present invention shown in FIGS.
includes a cylindrical portion 32b, a right-angled portion 32C, and a pair of left and right 7
A gap is formed between the rank part 32d and the cylindrical part 32b which is integrally formed with the pair of flange parts 32d, into which the end part 311 of the fiber-reinforced resin plate 310 is inserted. It consists of a bridge-like part 32e that is made into a shape.

In this embodiment, the metal eye member 32 is made by first forming the end portion 311 of the fiber-reinforced resin leaf spring 31 thinner than the main body portion 31e, and then forming the end portion 311 of the fiber-reinforced resin plate spring 31 thinner than the main body portion 31e, and then forming the cylindrical portion 32b into a bridge-like shape while the fiber-reinforced resin F is still soft. The cylindrical part 32 through the gap between the part 32e and the part 32e.
bK is wound to form an eyepiece portion 31C, and the tip portion 31d is overlapped with the main body portion 31e to form a band member 1 similar to that of the first embodiment.
Tighten with step 3 to secure it.

Next, a description will be given based on a fourth embodiment of the present invention shown in FIGS. 14 to 16. In this embodiment, the metal eye member 42 has a radial bulge surrounding the hole 42M. Part E has a chevron portion 42b on the top surface and a peace portion 42C on the bottom surface.
The corner portions 42d and 42d are each formed at an acute angle, and the 7th rank portion is not provided.

In this embodiment, the metal eye member 42 tears the fiber-reinforced resin plate spring 41 while the fiber-reinforced resin F is still soft, as shown in FIG.
The distal end portion 41d and the main body portion 41e are respectively tightened and fixed using a band member 13 similar to that of the first embodiment.

In each of the above embodiments, the band member 13 tightens the fiber-reinforced resin F after the fiber-reinforced resin has hardened to some extent.

The present invention is constructed as described above, and its operation will be explained below. First, in the first embodiment, the fiber-reinforced resin leaf spring 11 is connected to a mounting member such as a spring bracket or a shackle to a chassis frame by a pin member in the state shown in FIG. Fiber-reinforced resin leaf spring 11 is directly connected to Spring Plact eK
Since the side surfaces of the seventh rank portion 12b of the metal eye member 12 are in contact with each other, the side surface 11b of the end portion 11g of the fiber-reinforced resin leaf spring 11 will not be worn out even if it is subjected to severe friction. In addition, since the tip end lid is tightened by the band member 13, the eye member 12 is attached to the fiber reinforced resin plate spring 1.
There is no relative rotation with respect to the fiber reinforced resin plate spring 11, and since there is no drilling of the fiber reinforced resin PK, the reinforcing fibers are not cut, the strength of the fiber reinforced resin leaf spring 11 is not reduced, and furthermore, it is easy to assemble. It is.

1 ill! In the second embodiment, since the side surface of the flange portion 22d of the metal eyepiece member 22 comes into contact with the attachment member to the chassis frame and causes friction, the end portion 21a of the fiber-reinforced resin leaf spring 21 Since the side surface 21b does not wear out, and the flat plate portion 22c is inserted into the blast fiber reinforced resin F for a considerable length of time, the eyepiece member 22 is reliably stopped from rotating. Since it is wedge-shaped, it is compatible with the fiber-reinforced resin F, and favorable results can be obtained without sudden changes in stress values.

In the trap of the third embodiment, the metal eye member 32 has a 7-rank portion 32d at the end 3 of the leaf spring 31 made of fiber-reinforced resin.
An end portion 31a of the fiber-reinforced resin plate spring 31 is formed between the side surface 31b of the ta and the cylindrical portion 32b to prevent direct contact between the side surface 31b of the ta and the mounting member to the chassis frame.
Since it is sandwiched in, together with the tightening by the band member 13, the eye member 32 is more firmly fixed to the fiber reinforced resin leaf spring 31. Further, the right-angled portion 32C effectively acts as a rotation stopper.

In the fourth embodiment, the side surface of the radially bulging portion E of the metal eye member 42 and the end portion 4 of the fiber-reinforced resin leaf spring 41 are
Both sides 41b of 1a are in direct contact with the mounting member to the chassis frame, causing friction, but since the pressure-receiving area of the radial bulge E is large, most of the tangential load is received by this bulge E. Also, unless the bulging portion E is worn out, the fiber-reinforced resin leaf spring 41 will not be worn out either.

Since the present invention is constructed and operates as described above, it is possible to connect the end of the fiber-reinforced resin leaf spring to a mounting member such as a spring bracket or shackle to a chassis frame without cutting such as drilling a metal hole. Therefore, the reinforcing wires and fibers will not be cut, and the strength of the fiber-reinforced resin leaf spring will not decrease, and the ends of the fiber-reinforced resin leaf spring will not be subject to severe friction with the mounting member. However, since direct friction with the gold maple is avoided, the fiber-reinforced resin leaf spring does not wear out unilaterally, which is an excellent effect.
Furthermore, since there is no need to perform mechanical processing such as hole cutting on the fiber-reinforced resin, the assembly work can be easily performed.

[Brief explanation of the drawing]

Figures 1 to 4 11 Concerning a conventional example, Figure 1 is a plan view of the end of a fiber-reinforced resin plate spring, Figure 2 is a vertical cross-sectional view taken in the direction of the arrow 'T' in Figure 1, and Figure 3 is a FIG. 4 is a plan view of the end of the fiber-reinforced resin #plate genera, FIG. 4 is a vertical cross-sectional view taken along the direction of the Pi-IV arrow in FIG. The figure is a plan view of the end of a fiber-reinforced resin leaf spring, and Figure 6 is the Vl-
7 is a perspective view of the thing shown in FIG. 5, FIGS. 8 to 1O are related to the second embodiment of the present invention, and FIG. FIG. 9 is a longitudinal sectional view taken along arrows ■-■ of FIG. 8, FIG. 1θ is a perspective view of the book shown in FIG. 8, and FIGS. Regarding the third example, Fig. 11 is a plan view of the end of a fiber reinforced resin leaf spring, Fig. 12 is a vertical sectional view taken along the -M1 arrow in Fig. 11, and Fig. 13 is a view of the structure shown in Fig. 11. The perspective view and FIGS. 14 to 16 relate to the fourth embodiment of the present invention, FIG. 14 is a plan view of the end of the fiber-reinforced resin leaf spring, and FIG.
16 is a perspective view of the metal eye member shown in FIG. 15. 11.21.31.41 is a fiber reinforced resin leaf spring, ll
a, 21! , 31a, 41M are the ends of fiber reinforced resin plate springs, 12.22, 32.42 are metal eyepiece members, 12
a, 22al 32J1@ 42a is a hole into which a pin member is inserted, E is a radial bulge, and F is a fiber reinforced resin. Patent applicant Horikiri Spring Manufacturing Co., Ltd. Agent Patent attorney 1) Kazuo Figure 1 Figure 3 Figure 2 Figure 4 Figure 24 Figure 5 Figure 7 Figure 8 Figure 62 and Makoto 4 Figure 14 Tb Figure 15 Figure 16 245-

Claims (1)

[Claims] A radial hole is provided around a hole into which a pin member attached to a mounting member to the chassis frame such as a spring bracket or shackle is inserted to prevent wear between the end side of the leaf spring and the mounting member. A leaf spring made of fiber-reinforced resin, characterized in that a metal eye member having a bulge formed therein is embedded and fixed in the end portion.