JPS58225237A - Leaf spring and its molding method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in leaf springs made of fiber-reinforced plastics, and particularly to leaf springs that can be accurately positioned for assembly when assembled with pond members. It concerns springs.

For example, in the case of leaf springs for automobiles, it is necessary to install an axle at or near the center of the spring, and the spring is usually tightened with a clamping member, but this method does not allow the installation of the axle in the longitudinal direction of the spring. ” It does not determine the position. Therefore, bolt holes are drilled in the spring and the axle is attached via the bolts, but if the bolt holes are misaligned, the performance of the spring may be impaired. Further, drilling bolt holes with a drill impedes improvement in work efficiency. Furthermore, when several leaf springs are used in combination, it is necessary to position the springs with respect to each other.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a leaf spring in which the mounting position of the leaf spring can be accurately determined, the leaf spring can be correctly mounted, and its performance can be fully exhibited, and furthermore, there is no need for drilling work for bolt holes. The purpose is to

With this purpose in mind, the present invention
A leaf spring made of 11-carbon plastic, wherein a positioning member is integrally or separately located on at least one surface of the spring to determine the relative position of the spring with respect to the member to be combined with the input spring. The specified invention is a leaf spring made of fiber-reinforced plastics by impregnating the fibers with O (fat) and heating and pressurizing them with a press mold to form a leaf spring made of fiber-reinforced plastic. A second invention is to obtain a leaf spring by attaching and integrating the leaf spring to a fiber laminate.

In this invention, the positioning part shrine is integrated with the resin-impregnated #am laminate constituting the leaf spring or engages with a recess provided in the spring to project the main body from the leaf spring and perform a positioning action. The head of the positioning member is shaped like a shallow dish, so as not to protrude the Wj and seed arrangement of the fiber laminate described above, and to prevent resin-rich portions from forming in the molded spring. It also acts as a mold for forming the recesses in the fiber laminate.

Due to the presence of this positioning member, there is no need to drill bolt holes for attachment in the spring body, and since no bolt holes are provided, the strength of the spring body is improved.

The head of the positioning member described above may have a curved upper surface, a flat dish shape, or a conical shape.

When multiple leaf springs are stacked and clamped, a sheet-like buffer member made of rubber or plastic is placed on the opposing surface of the spring body to spread the load to the clamped spring body and prevent foreign matter from entering. prevent wear and tear.

If the buffer member is hard, the load will not be diffused, and if the clamp (U bolt) is tightened too much, cracks will occur in the spring body due to fatigue. The same applies if it is too soft.

The main body of the positioning member protrudes from the hole of the tensioned buffer member and performs a positioning function, and when the tensioning of the buffer member is performed by adhesive, it prevents foreign matter from entering between them. Prevent wear. The buffer member also acts as a fixing sheet for the positioning member.

The hardness of the buffer member is 50 to 60 Shore D hardness, and has good wear resistance.

It is preferable that the buffer key is fully stretched over the spring body.

When using multiple leaf springs in a bundle,
They may be stacked directly or with a spacer interposed therebetween.

In the molding method of the present invention, the positioning member is either integrated with the fiber laminate or acts as a mold to press the #lLm laminate and form the four parts during molding, and the positioning member is used to attach the four parts to the spring body. When provided, the positioning member has its head portion in the recess.

The main body protrudes and performs a positioning action.

The positioning member can be integrated at the same time as the spring body is formed, so the head of the positioning member has a
Grooves are provided to improve the penetration between the fibers and the resin.

Next, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 shows a method of manufacturing a leaf spring 10 according to the present invention, and the spring 10 is made of fiber-reinforced resin.

The spring 10 has WL fibers (mainly glass fibers are used) arranged in its length direction, and is hardened with a resin such as epoxy resin. The leaf spring 10 is formed by laminating multiple layers of resin-impregnated fibers to a suitable thickness, and the forming process is as follows:
For example, a resin-impregnated reinforcing fiber laminate is placed between the movable upper mold 11 and lower mold 12 of a pressure press, and the resin is cured by heating and pressurizing to form a mold made of wL fiber reinforced plastics.
This is done by means of molding the spring.

As shown in FIG. 1, a positioning member 13 is disposed on the lower mold 12. The positioning member 13
14 and a main body 15, the head 14 is dish-shaped and has a spherical upper surface, and the main body 15 is a round bar with a chamfered end.
It is temporarily held by the four parts 16 of 2.

The head 14 of the positioning member 13 is pressed against and abuts against the fiber laminate forming the spring during the resin curing stage, and as the resin hardens, the positioning member 13 is integrated with the molded leaf spring 10 and Acts as a positioning member for the spring. In some cases, the positioning member 13 described above can also be used as a mold member for forming four positioning parts on the leaf spring 10 to be molded, and in this case, the positioning member 13 may be
The protruding portion of the lower mold 12 may remain on the lower mold 12 when the mold is released.

The positioning member 13 has a head 141 as shown in FIG.
Grooves 17 are provided, and during molding, fibers and resin fit into these grooves, so that the positioning member 13 and the leaf spring to be molded are firmly joined and integrated. The grooves 17 are provided on the first surface (spherical shape) of the head 14 and are parallel to each other. The positioning member is set on the lower mold 12 so as to face.

When the head 14 of the positioning member 13 presses and contacts the spring, it is partially recessed, but since the recess is shallow and gentle, the fibers arranged on the surface of the spring around the head 14 are not aligned. However, as shown in FIG. When you touch it deeply,
Condition 1 where the arrangement of WLm is distorted and the fibers are separated.
9, resulting in resin-rich molded parts, which impede the performance as a spring. In this regard, according to the present invention, the positioning member can be fixed without disturbing the arrangement of the fibers, and the spring performance can be prevented from being affected.

FIG. 4 shows an example of the use of the leaf spring according to the present invention, in which two springs 20.2=1
are arranged parallel to each other via a spacer 26, a clamping plate 29 is arranged above one spring 20, and a clamping plate 32 is arranged below the other spring 21. Part 3
A member 33 to be connected to the plate 32 is located below the plate 32, and these members are fastened together by U bolts 35.

The free end of the IJ bolt 35 is tightened with a nut,
It is set to be fixed.

The springs 20 . 21 are positioned at predetermined positions by positioning members 22 . And we are facing each other. And clamping plate 29 and spring 20
The relative position of the spring 2 (2) is determined by the positioning member 27, the head of this part 427 engages with four parts of the surface opposite to the surface of the spring 2 ( ) that is engaged with the positioning member 22, and the main body is It is inserted into a hole in the pin plate 29.

The positioning member 3 () has four parts on the opposite surface of the spring 21 with which the positioning member 23 engages, and the main body passes through the hole in the clamping plate 32 and engages with the member 33, and The relative position between 34 and spring 21 is determined.

As shown in FIG. 4, each side of the spring 20.21 is provided with a buffer member 24.25.28.3 such as a thin elastic sheet.
1 is interposed. These buffer members are made of a material such as polyurethane rubber, and have a Shore hardness of 50 to 60 and are highly wear resistant. These damping members are glued to the face of each spring by means of an adhesive, and when the positioning member 22.23.27.30 engages and abuts the recess of each spring and is not itself joined, the positioning member 22.23.27.30 Hold each four parts securely. The buffer member acts to spread the clamp load over the entire spring, prevent foreign matter such as dirt and scum from entering the spring surface, and prevent wear.

11 FIG. 5 is a partially enlarged cross-sectional view of FIG.
It protrudes beyond the end (with a single taper) to prevent foreign objects from entering the clamped spring surface. Buffer part month 24.25 is spring 20.2
1, so those edges will not roll over and prevent foreign matter from entering.

The material for the buffer member is Gunrömp's rPresc.
A polyurethane rubber commercially available as Oltan J™ is used. This is grade 27 A
13, Shore hardness is 55. And the thickness is about 1.
5IIIll.

The head of the positioning member shown in FIG. 4 is not spherical but has a conical upper surface, or is formed shallowly so that it does not disturb the arrangement of the spring fibers M[.

The main body of the positioning member may have a round bar shape or may have various shapes depending on the various members to be fixed to the spring.

Further, the main bodies may be connected to each other like a spigoft and a socket.

In the embodiment described above, the recess of the spring that receives the head of the positioning member has a diameter of about 3 + nln,
The overall thickness of the spring is on the order of 30+nm.

[Brief explanation of the drawing]

FIG. 1 shows a spring according to the present invention in a press mold.
) A cross-sectional view showing an example of molding, Fig. 2 is a side view of the positioning member, Fig. 3 is an explanatory view showing the influence of the positioning member on fiber arrangement, and Fig. 4 is a cross-sectional view showing an example of how the spring is used. FIG. 5 is a sectional view of the main part of FIG. 4. 10.20.21 Leaf spring 11 Upper mold 12 Lower mold 13.22.23.27.30
Positioning member 14.18 Head of positioning member 15 Main body of positioning member 16 Four parts of lower mold 26.29.32 Spacer 24.25.28.31 B impact member: (5[1 Bolt drawing engraving (no change in content) ) Procedural amendment (method) % formula % ), Display of the case, Patent Application No. 70862 of 1982, Name of the invention Leaf spring and its molding method, Person making the amendment Relationship with the case Applicant name (name) GKN・Technology Limited 4, Agent

Claims (1)

Scope of Claims: (1) A leaf spring made of WLm reinforced plastics, wherein a positioning member is located integrally or separately on at least one force side of the spring, and a positioning member is located integrally or separately with respect to a member to be combined with the spring. Other leaf springs for automobiles, characterized in that they are configured to determine the relative positions of the springs. (2) The positioning member is composed of a head and a main body, and a portion of the head is dish-shaped and two curved surfaces. (3) The leaf spring according to claim 1 or 2, wherein the head of the positioning member is in contact with and joined to the surface of the leaf spring. (4) The leaf spring according to claim 1, wherein a buffer member is stretched over at least one surface, and the positioning member projects from the buffer member. (5) The adhesive spring according to claim 4, wherein the buffer member is bonded with an adhesive. (6) The leaf spring according to claim 4 or 5, wherein the buffer member is made of polyurethane rubber, has a Shore hardness of 50 to 60, and is wear resistant. (7) The leaf spring according to any one of claims 4 to 6, wherein the buffer member is fully tensioned. <8) A leaf spring made of fiber-reinforced plastic, in which the head of a positioning member is located in the four parts formed on at least one surface of the spring, and the main body of the member protrudes to be combined with the spring. The leaf spring according to claim 1, wherein the leaf spring is configured to determine the relative position of the spring with respect to the member. (9) The leaf spring according to claim 8, wherein at least one pair of leaf springs are combined via a spacer, and the positioning member of each spring engages with the spacer. (10) When forming a leaf spring made of fiber-reinforced plastic by impregnating it with N&Navy resin and heating and pressurizing it with a press mold, a protruding member is installed in the resin-impregnated fiber laminate. A method for forming a leaf spring with a positioning member characterized in that it is integrated. (11) The method according to claim 10, wherein the protruding member is a positioning member.