KR20220023929A - Shock absorbing member composition for vehicle leat spring with excellent elasticity and durability - Google Patents

Abstract

The present invention relates to a buffer member composition for a vehicle leaf spring having excellent elasticity and durability. More specifically, the present invention consists of a rubber-based resin, a filler material, an antioxidant, and a vulcanization accelerator. The buffer member composition for a vehicle leaf spring composed of the components exhibits an effect of improving the riding comfort of a vehicle by having excellent durability and improving elasticity.

Description

A cushioning member composition for a vehicle leaf spring with excellent elasticity and durability {SHOCK ABSORBING MEMBER COMPOSITION FOR VEHICLE LEAT SPRING WITH EXCELLENT ELASTICITY AND DURABILITY}

The present invention relates to a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability. to the composition.

The vehicle is provided with a suspension device for securing riding comfort and driving stability by absorbing vibration and shock from the road surface while supporting the weight of the vehicle body and reducing transmission to the vehicle body.

Among these suspensions, the suspension used in large vehicles mainly uses the leaf spring method in which several layers of spring steel plates are stacked and fixed. perform the function

Efforts have been made to improve the riding comfort of the occupant by applying a buffer member between the spring steel plates to the leaf spring to alleviate the load caused by the load or the impact generated from the road surface.

In general, large vehicles are formed in such a way that the wheels on both sides are connected to one axle, and the plate spring devices are attached to the upper portions of both sides of the axle, respectively. It is an absorbing structure.

Conventionally, efforts have been made to improve the riding comfort of a vehicle by applying a cushioning member capable of absorbing shock between the leaf springs. Not only was it easily damaged due to its low elasticity, but also the effect of improving the riding comfort was insignificant.

1 below shows a leaf spring in which a spring steel plate, which is a suspension device used in a medium-large vehicle, is stacked and fixed in multiple layers, and a red box shows a portion to which a buffer member can be applied.

Korean Patent Registration No. 10-1429462 (2014.08.06) Korean Patent Registration No. 10-1462239 (2014.11.10)

It is an object of the present invention to provide a cushioning member composition for a vehicle leaf spring excellent in elasticity and durability, which not only has excellent durability, but also has improved elasticity and thus improves the riding comfort of a vehicle.

An object of the present invention is achieved by providing a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability, characterized in that it consists of a rubber-based resin, a filler, an antioxidant and a vulcanization accelerator.

According to a preferred feature of the present invention, the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability comprises 100 parts by weight of a rubber-based resin, 30 to 40 parts by weight of a filler, 2 to 10 parts by weight of an antioxidant, and 1 to 3 parts by weight of a vulcanization accelerator. to be done

According to a more preferred feature of the present invention, the rubber-based resin is made by mixing at least one selected from the group consisting of butadiene rubber, nitrile butadiene rubber, styrene butadiene rubber and ethylene propylene diene monomer with natural rubber.

According to a more preferred feature of the present invention, in the rubber-based resin, the content of the natural rubber is 40% by weight or more.

According to a more preferred feature of the present invention, the filler is made of at least one selected from the group consisting of silica, barium and carbon black.

According to an even more preferred feature of the present invention, the vulcanization accelerator is made of sulfur.

According to an even more preferred feature of the present invention, the buffer member composition for a vehicle leaf spring having excellent elasticity and durability further contains 10 to 40 parts by weight of an additive relative to 100 parts by weight of the rubber-based resin to improve the loss factor, and the additive is rosin. It shall be made of at least one selected from the group consisting of resins, terpene-based resins, petroleum resins, coal resins, phenolic resins and xylene resins.

The cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention exhibits an excellent effect of improving the riding comfort of a vehicle by improving elasticity as well as having excellent durability.

1 is a photograph showing a leaf spring in which a spring steel plate, which is a suspension device used in a medium-large vehicle, is stacked and fixed in several layers.
2 is a photograph showing the appearance of the buffer member manufactured in Example 1 of the present invention.
3 is a photograph showing the leaf spring to which the buffer member manufactured in Example 1 of the present invention is applied.

Hereinafter, a preferred embodiment of the present invention and the physical properties of each component will be described in detail, which is intended to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily carry out the invention, This does not mean that the technical spirit and scope of the present invention is limited.

The cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention consists of a rubber-based resin, a filler, an antioxidant and a vulcanization accelerator, 100 parts by weight of a rubber-based resin, 30 to 40 parts by weight of a filler, 2 to 10 parts by weight of an antioxidant and 1 to 3 parts by weight of the vulcanization accelerator.

The rubber-based resin is a main material constituting the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention, and serves to impart impact resistance and elasticity to the cushioning member composition. , it is preferably made by mixing at least one selected from the group consisting of styrene butadiene rubber and ethylene propylene diene monomer.

The natural rubber serves to provide a cushioning member having a high tensile strength and excellent tensile strength. Preferably, the content of the natural rubber among the rubber-based resin is 40% by weight or more, and the content of the natural rubber is 40% by weight If it is less than negative, the durability of the buffer member may be reduced.

In addition, the butadiene rubber (BR, Butadiene Rubber) is a synthetic rubber product manufactured by solution polymerization of butadiene. It can be produced in two types of high cis content and low cis content. It is transparent and has excellent wear resistance as well as , It has excellent rebound elasticity, good dynamic properties, and excellent bending resistance and cold resistance.

In addition, the nitrile-butadiene rubber (NBR, Nitrile-butadiene rubber) is a synthetic rubber product made by emulsion polymerization of acrylonitrile and butadiene, and 35 to 45 parts by weight of acrylonitrile is mixed with 100 parts by weight of rubber. It has excellent oil resistance, abrasion resistance and aging resistance.

In addition, the styrene butadiene rubber (SBR, Styrene Butadiene Rubber) is a synthetic rubber product manufactured by emulsion polymerization of styrene and butadiene, and has a mixed (irregular) structure such as vinyl bonds, sis type 1,4 bonds , trans type 1,4 bonds, and vinyl (vi-nyl) 1,2 bonds are synthesized in three types, and compared to natural rubber, the quality is uniform, and the heat resistance and abrasion resistance are excellent.

In addition, the ethylene propylene diene monomer (EPDM) is a terpolymer, and has a structure in which the third component, Diene, is included in the ethylene and propylene binary copolymer, and has excellent aging resistance, cracking resistance, and water resistance.

The filler contains 30 to 40 parts by weight, and is made of at least one selected from the group consisting of silica, barium and carbon black, and serves to improve impact resistance and abrasion resistance of the cushioning member composition according to the present invention.

When the content of the filler is less than 30 parts by weight, the above effect is insignificant, and when the content of the filler exceeds 40 parts by weight, the content of the rubber-based resin is relatively reduced, so that the elasticity of the cushioning member may be reduced.

The antioxidant contains 2 to 10 parts by weight, and consists of 3C (N-PHENYL-N'-ISOPROPYL-P-PHENYLENEDIAMINE) or RD (POLYMERIZED 2,2,4-TRIMETHYL-1,2-DIHYDROQUINOLINE), It serves to suppress the oxidation of the buffer member according to the invention so that the physical properties can be maintained.

When the content of the antioxidant is less than 2 parts by weight, the antioxidant effect of the buffer member is insignificant, and when the content of the antioxidant exceeds 10 parts by weight, the content of the rubber-based resin, which is the main material, is relatively reduced, so that the elasticity of the buffer member is lowered. can

The vulcanization accelerator contains 1 to 3 parts by weight and consists of sulfur, which promotes the vulcanization reaction in the process of preparing the buffer member composition according to the present invention and exhibits excellent physical properties such as tensile strength and abrasion resistance due to the cross-linked structure. plays a role in providing

If the content of the vulcanization accelerator is less than 1 part by weight, the effect of accelerating vulcanization in the process of manufacturing the buffer pad in the mold is insignificant, and when the content of the vulcanization accelerator exceeds 3 parts by weight, the content of the rubber-based resin is reduced and Elasticity may be reduced.

In addition, the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention may further contain 10 to 40 parts by weight of additives relative to 100 parts by weight of the rubber-based resin to improve the loss factor, and the additives include rosin resin and terpene. It is preferably made of at least one selected from the group consisting of a resin-based resin, a petroleum resin, a coal resin, a phenol resin, and a xylene resin.

At this time, the loss factor is one of the evaluation indicators of the vibration damping properties of the damping material. In general, the larger the loss coefficient is, the more vibration is reduced. can further improve the riding comfort through the reduction of vibration of the vehicle.

When the content of the additive is less than 10 parts by weight, the above effect is insignificant, and when the content of the additive exceeds 40 parts by weight, the content of the rubber-based resin is relatively reduced, so that the elasticity of the buffer member may be reduced.

As shown in FIG. 3 below, the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability made of the above components is placed on a disk-shaped lower disk so that the cushioning member composition can be fixed to a groove provided in the vehicle leaf spring. It is molded to form a disk-shaped upper disk having a smaller diameter than the disk, and the upper disk has a diameter of 10 to 20 mm, preferably 13 mm, 15 mm and 16 mm, and a height of 4 to 6 mm, preferably is preferably molded to 5 mm.

In addition, the lower disk has a diameter of 52 to 60 mm, and can be variously applied to have diameters of 52 mm, 56 mm and 60 mm, respectively, depending on the type of the applied plate spring, and the thickness is preferably 6 to 12 mm, and the applied plate Depending on the type of spring, it can be applied in various ways to have diameters of 6mm, 8mm, 10mm, and 12mm, respectively.

In addition, although both the upper disk and the lower disk are generally applied in a circular shape, in some cases, the lower disk may be applied in a square plate shape.

Hereinafter, a method for manufacturing a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention and physical properties of the cushioning member composition prepared through the manufacturing method will be described with reference to Examples.

<Example 1>

100 parts by weight of rubber-based resin (NR 40% by weight, BR 60% by weight), 35 parts by weight of filler (silica), 6 parts by weight of antioxidant (3C), and 2 parts by weight of vulcanization accelerator (sulfur) are put into a mixing device equipped with a stirrer After preparing a mixture by stirring at 150 rpm for 10 minutes, the mixture was molded with an injection molding device (lower disk: diameter 56 mm, height 8 mm, upper disk: diameter 16 mm, height 5 mm), so that the vehicle leaf spring with excellent elasticity and durability A buffering member composition was prepared.

<Example 2>

The same procedure as in Example 1 was performed, except that a rubber-based resin (NR 40%, NBR 60%) was used to prepare a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability.

<Example 3>

The same procedure as in Example 1 was performed, except that a rubber-based resin (NR 40%, SBR 60%) was used to prepare a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability.

<Example 4>

The same procedure as in Example 1 was performed, except that a rubber-based resin (NR 40%, EPDM 60%) was used to prepare a cushioning member composition for a vehicle leaf spring having excellent elasticity and durability.

The elasticity and durability of the cushioning member compositions for vehicle leaf springs having excellent elasticity and durability prepared in Examples 1 to 4 were measured and shown in Table 1 below.

{However, the elasticity was confirmed by tensile elongation, and the method of confirming compressive and flexural strength was used for durability. For tensile elongation, the test method of ASTM D638 was used, and for the compressive strength, the test method of KS F 2206 was used, The test method of KS F 2326 was used for flexural strength.}

<Table 1>

As shown in Table 1, it can be seen that the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability prepared in Examples 1 to 4 of the present invention has excellent durability and elasticity.

Therefore, the cushioning member composition for a vehicle leaf spring having excellent elasticity and durability according to the present invention not only has excellent durability, but also has improved elasticity to improve the riding comfort of a vehicle.

Claims (7)

A cushioning member composition for a vehicle leaf spring having excellent elasticity and durability, characterized in that it consists of a rubber-based resin, a filler, an antioxidant and a vulcanization accelerator.
The method according to claim 1,
The cushioning member composition for a vehicle leaf spring having excellent elasticity and durability comprises 100 parts by weight of a rubber-based resin, 30 to 40 parts by weight of a filler, 2 to 10 parts by weight of an antioxidant, and 1 to 3 parts by weight of a vulcanization accelerator. This excellent cushioning member composition for a vehicle leaf spring.
The method according to claim 1 or 2,
The rubber-based resin is a natural rubber, butadiene rubber, nitrile butadiene rubber, styrene butadiene rubber, and a buffer member composition for a vehicle leaf spring excellent in elasticity and durability, characterized in that made by mixing at least one selected from the group consisting of ethylene propylene diene monomer.
4. The method according to claim 3,
The rubber-based resin is a cushioning member composition for a vehicle leaf spring excellent in elasticity and durability, characterized in that the content of the natural rubber is 40% by weight or more.
The method according to claim 1 or 2,
The cushioning member composition for a vehicle leaf spring having excellent elasticity and durability, characterized in that the filler is made of at least one selected from the group consisting of silica, barium and carbon black.
The method according to claim 1 or 2,
The vulcanization accelerator is a cushioning member composition for a vehicle leaf spring excellent in elasticity and durability, characterized in that consisting of sulfur.
The method according to claim 1,
The cushioning member composition for a vehicle leaf spring having excellent elasticity and durability further contains 10 to 40 parts by weight of additives compared to 100 parts by weight of the rubber-based resin in order to improve the loss factor,
The additive is a buffer member composition for a vehicle leaf spring having excellent elasticity and durability, characterized in that it consists of at least one selected from the group consisting of rosin resin, terpene-based resin, petroleum resin, coal resin, phenol resin and xylene resin.

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