JPS6220926A - Compound laminated spring device - Google Patents

Abstract

PURPOSE:To avoid getting any friction, by making a steel spring plate wider than an FRP-make spring plate at a part where plate spring accessries of a U-bolt and so on are installed, and preventing this FRP-make spring from coming into contact with these plate spring accessories. CONSTITUTION:In this compound laminated spring device 10, at least one sheet of a steel spring plate 11 and at least one sheet of FRP-make spring plate 12 and 13 are superposed with on another, and each clip 20 or plate spring accessories to be opposed to a side end surface of the spring plate is attached to both these spring plates 11-13. And, in order to prevent leg parts 22 and 23 of these clips 20 from contacting with the side end surface of each of these spring plates 12 and 13, at least a part of each clip 20, width of the steel spring plate 11 is formed into being wider than that of each of these FRP-make spring plates 12 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a composite stacked leaf spring assembly in which a steel spring plate and an FRPtJ spring plate are combined.

[Conventional technology]

As shown in FIG. 8, the composite stacked plate spring device includes at least one spring plate 1 made of 14 and at least
It is combined with two FRP (48 strip reinforced plastic) spring plates 2 and fastened using U bolts 3 and nuts 4. In this case, the legs 5 of the U-bolts 3 will face the end faces in the width direction (hereinafter referred to as side end faces) of the spring plates 1 and 2, but since FRP is more susceptible to FJ friction than steel, the legs It is not preferable for the portion 5 to directly contact the FRP spring plate 2.

For this reason, for example, as shown in Japanese Unexamined Patent Publication No. 56-94041@, by providing a spacer made of synthetic resin or the like between the leg of the U bolt and the FRP spring plate, the FRP
It has also been considered to protect RP spring plates.

Additionally, a metal clip 7 is provided at the end of the prior art leaf spring device shown in FIG.

This clip 7 is provided for the purpose of preventing lateral displacement between the steel spring plate 1 and the FRP spring plate 2, or for relaxing stress on the parent spring plate 1 when the vehicle rebounds.

(Problem to be Solved by the Invention) However, in this case as well, the leg portion 8 of the clip 7 faces the side end surface of the FRP spring plate 2, so when the leg portion 8 and the FRP spring plate 2 come into contact, the FRP spring plate 2 The plate 2 is worn out and the FR
Cracks may occur along the P m-fibers.

In particular, the vA spring plate 1 may bend in the width direction of the plate as shown in FIG. 10 due to the effects of rolling and heat treatment such as quenching performed during manufacture of the spring plate 1. On the other hand, since the FRPI spring plate 2 is molded using a mold, it does not bend in the width direction of the plate. For this reason, when the spring plate 1 and the FRP spring plate 2, which have the same plate width [1] are stacked, there is no misalignment in the plate width direction at the longitudinal ends of the steel spring root 1 and the FRP spring plate 2. This may occur. As shown in FIG. 11, when the clip 7 is bent and the FRP spring plate 2 interferes with the clip 7, the
The side end surfaces of the RP spring plate 2 may be extremely worn.

In order to prevent such FJ problems, it is necessary to add a correction process.
Although it is possible to improve the straightness of the spring plate 1 made by A, straightening the spring plate after heat treatment causes various problems and is not practical. Furthermore, even if a spacer made of synthetic resin or the like is interposed between the leg portion 8 of the clip and the FRP spring plate 2, a certain amount of wear is unavoidable, and the method of mounting the spacer is a problem in order to provide the spacer. This may lead to an increase in the number of parts.

(Means for Solving the Problems) The present invention provides at least one steel spring plate and at least one steel spring plate.
The present invention is applied to a composite stacked leaf spring device in which two FRPI spring plates are stacked one on top of the other in the thickness direction, and a leaf spring accessory is provided that faces the side end surfaces of the spring plates. What are leaf spring accessories?
Examples include Upol I~, clips, eyeball brackets and eyeball shackles for attaching leaf springs to the vehicle body.

Further, in the composite stacked leaf spring device of the present invention, the plate width of the steel spring plate is made wider than the plate width of the FRP spring plate over the entire length of the spring plate, or the plate spring plate is The spring plate is characterized in that the width of the spring plate is wider than that of the FRP spring plate.

(Function) In the stacked leaf spring device having the above configuration, the temporary width of the steel spring is FRP at least in the part where the leaf spring accessory is provided.
Since it is wider than the width of the steel spring plate, the leg of the leaf spring accessory contacts the steel spring plate. In other words,! Even if the L-made spring plate is slightly bent in the width direction of the plate, the legs of the plate spring accessory can be prevented from coming into contact with the side end surfaces of the FRPM spring plate, and the disadvantage of FRP, which is weak against friction, can be avoided. .

[Embodiment of the Invention] In one embodiment shown in FIGS. 1 to 3, the composite stacked leaf spring device 10 includes one steel spring plate 11 and one or more FRP spring plates. 12.13. The steel spring plate 11 is a main plate and has eyelets 14, 15 at both ends thereof. This eyepiece portion 14,15 is attached to the vehicle body via a connecting member (not shown), such as an eyeball bracket or a shackle.

The longitudinal intermediate portions of the steel spring plate 11 and the FRP spring roots 12 and 13 are restrained to each other by a center bolt 18 and a lug h 19. The intermediate portions of the temporary springs 11, 12, and 13 in the longitudinal direction are fastened to the member on the seventh wheel side using U poles 1- (not shown).

A metal scrap clip 20, which is an example of a leaf spring accessory, is provided at the end portions of the steel spring plate 11 and the FRP spring plate 12. The clip 20 is the main spring plate 11 at the time of rebound.
It has the function of protecting the spring plates 11 and 12 from shifting laterally. This clip 20 has a pair of leg portions 22.23 facing the side end faces of the spring plate 11.12.

The lower ends of the leg parts 22.23.7) of the clip are connected by a horizontal part 25. This horizontal portion 25 is fixed to the spring plate 12 by suitable means such as sliding or screwing. Further, the upper ends of the leg portions 22, 23 are tied together by a rod-shaped member 27 such as a bolt or a bottle. Note that instead of providing the rod-shaped member 27, the upper end portions of the leg portions 22 and 23 may be bent inward to form a clinch-type clip.

The width of the w4 spring plate 11 is FRP over its entire length.
! It is wider than the plate width of II springs 12 and 13. Hereinafter, for ease of understanding, a model will be considered in which one steel spring plate 11 and one FRP spring plate 12 having the same length are combined. In addition, the plate width of the IM spring plate 11 is bl,
Let the plate width of the FRP spring plate 12 be bl.

Under the above conditions, the ratio W2 /Wl of the combination weight W1 of bl = b2 (when the widths are equal) and the combination i1mW2 of bi = α・bl (IR where the steel spring plate is wider)
Consider. Here, assuming that the spring constant is not changed, it can be seen that the weight ratio W2/Wl changes depending on the size of α, as shown in Table 1 below. i.e. 14
In the case of a composite stacked leaf spring device that combines the F and l spring plates 11 and FRP spring plates 12, rather than designing them with equal plate widths, the width of the FRP spring plates 11 is narrowed and the FRP is made by that much. By increasing the thickness of the manufactured spring plate 12, the total weight of the combined spring can be reduced.

Table 1 The following Table 2 compares the dimensions, weight, etc. of the conventional product and this example product in the case of a combination spring consisting of one steel spring plate 11 and one FRP spring plate 12. .

Table 2 As can be seen from the above, according to this example, FRP
By narrowing the width of the spring plate 12 made of steel and increasing the thickness of the spring 12 made of FRP by that much, the width of the spring plate made of steel and the FR
It is lighter than a conventional composite stacked leaf spring device in which the spring plates made of P have the same width.

Since the width of the steel spring plate 11 is wider than that of the FRP spring plate 12, the width of the steel spring plate 11 is wider than that of the FRP spring plate 12. As shown in FIG. 11
Even if the spring plate 11 is slightly bent in the width direction, a gap 30 can be secured between the side end surface 12a of the FRP spring 12 and the leg portion 22 of the clip, as shown in FIG. Therefore, the FRP spring plate 1 is said to be weak against friction.
2 and the leg portions 22, 23 can be avoided.

In addition, in the stacked leaf spring device for an automobile, the difference between the plate width b2 of the steel spring plate 11 and the plate width b2 of the FRP spring plate 12 is preferably in the range of 2 to 20 m+. According to the research of the present inventors, when considering the bending of the steel spring plate 11 in the width direction, when the difference between bl and bl is 2 m or less, the side end surface of the FRP spring plate 12 It may protrude outside the side end face, making it impossible to achieve the intended purpose of the present invention. However, when the difference between bl and bl becomes 20 or more, the contact area between the W4 spring plate 11 and the FRP spring plate 12 in the thickness direction becomes too small. When the contact area decreases, the surface pressure of the FRP spring plate 12 increases, the amount of wear increases, and durability becomes a problem.

The number of steel spring plates 11 may be two or more, and F
The number of RP springs 12 and 13 can also be arbitrarily selected as required. Moreover, as shown in FIG. 6 or FIG. 7, the order in which the steel spring plate 11 and the FRP spring plate 12, 13 are stacked may be changed.

Further, the present invention is effective not only for clips but also for avoiding contact between the legs of a U-bolt and an FRP spring plate, for example.

Further, the intended purpose of the present invention can also be achieved by making the width of the W4 spring plate wider than that of the FRP spring plate only at the position where the clip or bolt is provided.

[Effects of the Invention] According to the present invention, it is possible to prevent the leg portion of the leaf spring accessory from coming into contact with the FRP spring, which is effective in protecting the FRP spring plate which is vulnerable to friction.

[Brief explanation of drawings]

Figure 1 is a bottom view of a leaf spring showing an embodiment of the present invention, Figure 2 is a side view of the leaf spring device shown in Figure 1, and Figure 3 is the line ■-■ in Figure 2. 4 is a bottom view showing the steel spring plate in a bent state, FIG. 5 is a sectional view of the leaf spring device shown in FIG. 4, and FIG. 6 is another embodiment of the present invention. FIG. 7 is a sectional view showing still another example of the present invention. Figure 8 is a side view of a conventional leaf spring device;
The figure is a perspective view of yet another conventional stacked leaf spring device, FIG. 10 is a bottom view of the leaf spring device shown in FIG. 9, and FIG. 11 is a clip of the leaf spring device shown in FIG. It is a sectional view showing a state in which an FRP spring plate interferes. 10...Composite stacked leaf spring device, 11...Steel spring ridge, 12...FRPtJ spring plate, 20...Clip (
Leaf spring accessories), 22.23...Leg part. Applicant's agent Patent attorney Takehiko Suzue S1gJ n Figure 2 b Figure 31'l:1 Figure 4 @7WJ Figure 8 Figure 9 Figure 10 Figure 11

Claims (2)

[Claims] (1) At least one steel spring plate and at least one FRP spring plate are overlapped in the thickness direction, and a leaf spring accessory is provided that has a leg portion facing the widthwise end surface of the spring plate. In the composite stacked leaf spring device, the width of the steel spring plate is made of FRP over the entire length of the spring plate.
Make the plate width wider than the steel spring plate, or make the plate width of the steel spring plate FR in the area where the above leaf spring accessories are installed.
A composite stacked leaf spring device characterized by having a width wider than that of the P spring plate. (2) The composite stacked leaf spring device according to claim 1, wherein the width of the steel spring plate is 2 to 20 mm larger than the width of the FRP spring plate.