JPS61248929A - Liner for frp-stacked plate spring - Google Patents

Abstract

PURPOSE:To reduce the inter-plate friction force, improve comfortableness to ride in, and prevent creaking sounds from occurring by producing liners with fluororesin-filled nylon resin. CONSTITUTION:Liners 30 provided between spring plates 2, 3 are produced by using nylon as a base material, mixing reinforcing fibers into this base material to reinforce it, and mixing fluororesin as a filling material. Its friction coefficient can be reduced by adding fluororesin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liner for an FRP leaf spring used in a leaf spring using FRP spring plates.

[Conventional technology]

For example, when using FRP (fiber-reinforced synthetic resin) spring plates for the stacked leaf springs of a vehicle suspension system, FRP spring plates are susceptible to abrasion, so wear-prevention measures are used to prevent wear between the plates. A steel liner is provided between the spring plates.

On the other hand, in conventional stacked leaf springs using steel spring plates, in order to prevent squeaks caused by friction between the plates, a liner made of resin such as polyethylene is installed between the spring plates to reduce friction between the plates. It is being done.

(Problems to be solved by the invention) ・Conventional F
When a steel liner is interposed between the plates in an RP stacked leaf spring, the friction of the steel liner causes a creaking sound, and the friction between the plates becomes too large, resulting in poor riding comfort.

Therefore, in order to reduce squeak noise and friction between the plates, we replaced the resin liner used in conventional steel stacked leaf springs with FRP.
It is also possible to use it as a stacked leaf spring. However, FRP spring plates conduct heat better than steel spring plates, making it difficult for heat generated by friction to dissipate, and conventional resin liners lack heat resistance and are inferior in durability.

[Means for solving problems]

The present invention is a resin liner interposed between the plates of a stacked leaf spring using FRP spring plates, using nylon as the base material, reinforcing the nylon base material with fibers, and containing fluorine as a filler. It is characterized by containing resin. Examples of the above-mentioned fibers include glass fibers, carbon fibers, and resin fibers.

The fluororesin is mixed, for example, in the form of powder, granules, or flakes.

[Effect]

The liner is attached to at least one of the mutually opposing surfaces of the spring plates, and the spring plates indirectly come into sliding contact through this liner. The liner can be attached by gluing or screwing or both. The resin liner of the present invention has a low coefficient of friction, can reduce the frictional force between the plates, and does not generate squeaks. Therefore, when attached to a stacked leaf spring for vehicle suspension, the riding comfort is improved. Moreover, it has excellent durability against friction and has a long life.

〔Example〕

In the stacked leaf spring device 1 shown in FIG. 1, the plurality of spring plates 2.3.4 stacked in the thickness direction are all FR
It is made by P. The main spring plate 2 located at the top of the diagram
An eyepiece member 7 and a support 8 are attached to both ends of the holder, respectively, by connecting members 10 such as screws.

Each spring plate 2.3.4 is mutually restrained by a center bolt 12 and a nut 13 at a longitudinally intermediate or center clamping portion. Furthermore, this center clamp part includes a U bolt 15, a nut 16, a washer 17, and a pad 1.
The axle housing 20 is connected using 8 or the like.

A center spacer 22 is also provided between the spring plates 2°3.4.

A liner 3 is placed at the end of the spring plate 3.4 and at the middle of the length of the spring plate 2.3 opposite to this end.
0 is embedded in or provided on the surface of the spring plate.

This liner 30 uses nylon 66 (polyhexamethylene aziboamide) as a base material, that is, a matrix, and strengthens the base material by mixing glass fiber as a reinforcing material into this base material, and also contains fluorine as a filler. It is mixed with resin.

The glass fibers used are, for example, short fibers (chopped strands) having a length of about several meters, and are mixed, for example, at about 30% by weight. The practical range of the amount of glass fiber incorporated is 1 to 50% by weight.

On the other hand, fluororesin is made by powdering Teflon (trade name of polytetrafluoroethylene), for example, from 1 to 30%
% by weight, preferably 10% by weight. Note that it may be mixed in a state other than powder. The addition of fluororesin reduces the coefficient of friction. In this way, the glass fiber-reinforced fluororesin-filled nylon resin liner 30
is obtained.

The following table shows a comparison of the physical properties of the product of this example and the conventional product.

In this table, conventional product 1 has a steel liner attached to an FRP spring plate, and conventional product 2 has a conventional resin liner attached to a steel spring plate. In addition, “2” in the table
As shown in FIG. 2, F' represents the difference between the applied load F1 and the reduced load F2 at a predetermined deflection, and the magnitude of 2F is a measure of the frictional force between the plates.

Note 1) The size of 2F when the conventional product is taken as 100.
The liner configuration in this example product is not two resin liners, but one is a resin liner and the other is a spring steel (steel plate).
Similar results were obtained for the Further, similar results were obtained even when the filler material of the product of this example was changed from glass fiber to an inorganic material such as carbon fiber, Kepler fiber, or ceramic.

As shown in the above table, the product of this example does not generate any squeak noise, has a small frictional force between the plates, and has good riding comfort. Moreover, the durability is significantly improved compared to conventional products. In addition, although the coefficient of friction is small, it has good adhesion to the spring plate, and can be fixed with either adhesive or screws.

Note that the resin liner of the present invention can also be used in a stacked leaf spring that is a combination of an FRP spring plate and a steel spring plate.

(Effects of the Invention) According to the present invention, the squeaking noise of FRP stacked leaf springs can be prevented;
It is also effective in improving ride comfort when installed in a vehicle. Furthermore, the resin lychee of the present invention has excellent durability and good adhesiveness compared to conventional resin liners for steel springs. Furthermore, since the liner contains reinforcing fibers, even if it is screwed on, it will not be damaged through the screw holes unlike conventional resin liners.

[Brief explanation of drawings]

FIG. 1 is a side view of a stacked leaf spring device showing one embodiment of the present invention, and FIG. 2 is a diagram showing the difference between applied load and reduced load at a predetermined deflection. 1... Layered leaf spring device, 2.3.4-F RP spring plate, 30... Liner. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2! l! i boiled

Claims (3)

[Claims] (1) A liner for FRP stacked leaf springs, which uses nylon as a base material, which is reinforced with fibers and mixed with fluororesin. (2) 1 to 30% by weight of fluororesin, 1% of inorganic fiber
A liner for an FRP leaf spring according to claim 1, characterized in that the liner contains nylon 66 in an amount of 50 to 50% by weight and the remainder is nylon 66. (3) The liner for an FRP laminated leaf spring according to claim (2), characterized in that the fibers are inorganic fibers such as glass fibers, carbon fibers, Kepler fibers, metal fibers, etc.