KR102681368B1 - Composite of composite materials for cam sprocket and cam sprocket including the same - Google Patents

Abstract

The present invention relates to a composite composition for a cam sprocket and a cam sprocket containing the same. More specifically, to a composite composition for a cam sprocket that can be used in a cam sprocket that is lightweight and can reduce engine driving noise, and a composite composition for a cam sprocket that can be used in a cam sprocket that is lightweight and can reduce engine driving noise. The goal is to provide a cam sprocket that can reduce .

Description

Composite composition for cam sprocket and cam sprocket including same {COMPOSITE OF COMPOSITE MATERIALS FOR CAM SPROCKET AND CAM SPROCKET INCLUDING THE SAME}

The present invention relates to a composite composition for a cam sprocket and a cam sprocket containing the same. More specifically, to a composite composition for a cam sprocket that can be used in a cam sprocket that is lightweight and can reduce engine driving noise, and a composite composition for a cam sprocket that can be used in a cam sprocket that is lightweight and can reduce engine driving noise. The goal is to provide a cam sprocket that can reduce .

The cam sprocket is a sprocket installed at the end of the camshaft and is connected to the crankshaft sprocket with a chain. Cam sprockets used in vehicles are usually formed of metal. Accordingly, there is a problem that the weight is large and vibration occurs due to the eccentricity of the rotor when the engine is driven, causing driving noise. In addition, referring to Figure 1, in the conventional cam sprocket, the part that is fastened to the flange (the part indicated by the dotted line) protrudes toward the center of the cam sprocket, so the stress is not distributed, but the stress is concentrated on the protruding part, causing the cam sprocket to be damaged. There is a problem that the lifespan is shortened.

Korean Publication No. 2008-0007651

The purpose of the present invention is to provide a composite composition for a cam sprocket that can be used in a cam sprocket that is lightweight and can reduce engine driving noise.

The purpose of the present invention is to provide a cam sprocket that is lightweight and can reduce engine driving noise.

The composite composition for a cam sprocket according to an embodiment of the present invention includes 45 to 60 parts by weight of a phenolic compound, 25 to 33 parts by weight of aramid fiber, 7 to 15 parts by weight of aramid pulp, 0.1 to 1.0 parts by weight of an antioxidant, and 0.1 part by weight of a heat-resistant stabilizer. to 1.0 parts by weight, and 0.1 to 0.5 parts by weight of a lubricant.

The aramid fiber may have a diameter of 9 to 14 ㎛ and a length of 6 to 8 mm.

The aramid pulp may have a diameter of 2 to 5 ㎛ and a length of 0.4 to 1.1 mm.

The antioxidant is Tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methane, Tris(2,4-di-tert-butylphenyl) phosphite, Tris(Nonylphenyl) phosphites, Phenyldiisodecylphosphite, and combinations thereof. It may be selected from the group consisting of.

The heat-resistant stabilizer may be Pentaerythrityl tetrakis(3-laurylthiopropionate).

The lubricant may be selected from the group consisting of ethylene bis stearamide, glycerin fatty acid ester, fatty acid ester, fatty alcohol, and combinations thereof.

The composite composition for a cam sprocket according to an embodiment of the present invention may further include a nucleating agent.

The nucleating agent may be selected from the group consisting of Di(p-methylbenzylidene) Sorbitol, Di(p-ethylbenzylidene)Sorbitol, Bis(3,4-dimethylbenzylidene)sorbitol, and combinations thereof.

A cam sprocket according to an embodiment of the present invention includes an outer portion whose outer surface has a sawtooth shape, a middle portion connected to the inner surface of the outer portion, and metal inserts inserted into a plurality of fastening holes provided inside the middle portion. Includes. The outer portion surrounds the middle portion, and the metal inserts are engaged with the flange. Each of the outer portion and the middle portion includes a composite material composition for a cam sprocket. The composite composition for a cam sprocket includes 45 to 60 parts by weight of a phenolic compound, 25 to 33 parts by weight of aramid fiber, 7 to 15 parts by weight of aramid pulp, 0.1 to 1.0 parts by weight of an antioxidant, 0.1 to 1.0 parts by weight of a heat-resistant stabilizer, and 0.1 part by weight of a lubricant. It contains from 0.5 parts by weight.

The cam sprocket according to an embodiment of the present invention may have a constant distance from the center of the cam sprocket to the inner surface of the middle portion.

According to the composite composition for a cam sprocket according to an embodiment of the present invention, the cam sprocket can be lightweight and engine driving noise of a transportation vehicle can be reduced.

According to the cam sprocket according to an embodiment of the present invention, the cam sprocket can be lightened and engine driving noise of a transportation vehicle can be reduced.

1 is a schematic perspective view of a conventional cam sprocket.
Figure 2 is a schematic diagram of a composite composition for a cam sprocket according to an embodiment of the present invention.
Figure 3 is a schematic perspective view of a cam sprocket according to an embodiment of the present invention.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments related to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

While describing each drawing, similar reference numerals are used for similar components. In the attached drawings, the dimensions of the structures are enlarged from the actual size for clarity of the present invention. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” another part, this includes not only being “directly above” the other part, but also cases where there is another part in between. Conversely, when a part of a layer, membrane, region, plate, etc. is said to be "underneath" another part, this includes not only being "immediately below" the other part, but also cases where there is another part in between.

Hereinafter, a composite composition for a cam sprocket according to an embodiment of the present invention and a cam sprocket according to an embodiment of the present invention will be described.

Figure 2 is a schematic diagram of a composite composition for a cam sprocket according to an embodiment of the present invention. Figure 3 is a schematic perspective view of a cam sprocket according to an embodiment of the present invention.

Referring to Figures 2 and 3, a cam sprocket (CS) according to an embodiment of the present invention can be used in a transportation vehicle. A means of transportation may refer to a means used to transport goods, people, etc. Means of transport include, for example, land transport, sea transport, and air transport. Land transportation means may include, for example, cars, bicycles, motorcycles, trains, etc., including passenger cars, vans, trucks, trailer trucks, and sports cars. Maritime vehicles may include, for example, ships, submarines, etc. Celestial vehicles may include small, non-corporeal vehicles such as airplanes, hang gliders, hot air balloons, helicopters, and drones, for example.

Referring to FIG. 2, a cam sprocket (CS) according to an embodiment of the present invention includes an outer portion 100, a middle portion 200, and metal inserts 300. Enclosure 100 includes an outer surface 110 and an inner surface 120. The outer surface 110 of the outer portion 100 has a sawtooth shape. The sawtooth shape may mean a shape in which concave portions and convex portions are formed alternately. The spacing of the recesses may be the same or different from each other. The spacings of the convex portions may be the same or different. The inner surface 120 of the outer portion 100 is connected to the middle portion 200 . The outer portion 100 surrounds the middle portion 200.

Middle portion 200 includes an outer surface 210 and an inner surface 220. Each of the outer surface 210 and inner surface 220 of the middle portion 200 may be circular in cross-section. The middle portion 200 is connected to the inner surface 220 of the outer portion 100. The middle portion 200 includes a plurality of fastening holes (LH). Each of the metal inserts 300 is inserted into each of the plurality of fastening holes LH. The portion where the fastening holes LH are disposed does not protrude from the inner surface 220 to the center CC of the cam sprocket CS. The distance from the center (CC) of the cam sprocket (CS) to the inner surface 220 of the middle portion 200 may be constant.

Metal inserts 300 are fastened to the flange 500. Although it has been described as an example that there are three metal inserts 300, the number is not limited thereto, and the number is not limited as long as they can be connected to the flange 500.

The portion fastened to the flange 500 is provided with metal inserts 300 made of metal rather than the cam sprocket composite composition (CSC), thereby preventing cracks from occurring when fastened to the flange 500.

Each of the outer portion 100 and the middle portion 200 includes a cam sprocket composite composition (CSC). That is, each of the outer portion 100 and the middle portion 200 may be formed of a composite material made from a composite material composition for a cam sprocket (CSC in FIG. 3) according to an embodiment of the present invention.

Referring to Figure 3, the composite composition (CSC) for a cam sprocket according to an embodiment of the present invention includes 45 to 60 parts by weight of a phenolic compound (1000), 25 to 33 parts by weight of aramid fiber (2000), and aramid pulp (3000). ) 7 to 15 parts by weight, 0.1 to 1.0 parts by weight of antioxidant (4000), 0.1 to 1.0 parts by weight of heat-resistant stabilizer (5000), and 0.1 to 0.5 parts by weight of lubricant (6000). A “~”-based compound may mean that a compound corresponding to “~” is included in the compound.

The phenol-based compound (1000) can maintain the mechanical rigidity and heat resistance of the cam sprocket composite material. The phenol-based compound (1000) can prevent deformation and strength reduction after molding of the cam sprocket composite material. The relative viscosity of the phenolic compound (1000) may be 2.1 to 3.1. The molecular weight of the phenolic compound (1000) may be 11,000 to 21,000 g/mol. If the relative viscosity and molecular weight are outside the above range, it is difficult to maintain the mechanical rigidity and heat resistance of the cam sprocket composite material, and deformation and strength reduction may occur after molding the cam sprocket composite material.

Phenolic compounds (1000) include, for example, 3-bromo-2',6-dihydroxydiphenylmethane, 3,3'-dibromo-6, 6'-dihydroxydiphenylmethane (3,3'-dibromo-6,6'-dihydroxydiphenylmethane), 3,3'-dibromo-4,4'-dihydroxydiphenylmethane (3,3' -dibromo-4,4'-dihydroxydiphenylmethane), 3,3',5-tribromo-4,4'-dihydroxydiphenylmethane (3,3',5-tribromo-4,4'-dihydroxydiphenylmethane) and may be selected from the group consisting of combinations thereof.

The phenolic compound 1000 may be included in an amount of 45 to 60 parts by weight based on the total weight of the composite composition for a cam sprocket. If the phenolic compound (1000) is less than 45 parts by weight, the durability of the cam sprocket composite may decrease, and if the phenolic compound (1000) is more than 60 parts by weight, deformation and strength reduction may occur after molding the cam sprocket composite. You can.

Aramid fiber 2000 may maintain the elastic modulus and elongation at break of the cam sprocket composite material. Aramid fiber 2000 may have a diameter of 9 to 14 μm and a length of 6 to 8 mm. If the aramid fiber 2000 is less than the above range, the elastic modulus of the cam sprocket composite may decrease, and if the aramid fiber 2000 is greater than the above range, it may be difficult to reduce the weight of the cam sprocket composite.

The aramid fiber 200 may be, for example, a meta-aramid fiber represented by Formula 1 below or a para-aramid fiber represented by Formula 2 below.

[Formula 1]

[Formula 2]

Aramid fibers (2000) may be included in an amount of 25 to 33 parts by weight, based on the total weight of the composite composition for a cam sprocket. If the aramid fiber (2000) is less than 25 parts by weight, the strength and elastic modulus of the composite material for the cam sprocket may decrease, and if the aramid fiber (2000) is more than 33 parts by weight, the elongation at break decreases and the weight of the composite material for the cam sprocket is reduced. can be difficult.

Aramid pulp 3000 may maintain the elastic modulus and elongation at break of the composite material for the cam sprocket. Aramid pulp 3000 may have a diameter of 2 to 5 ㎛ and a length of 0.4 to 1.1 mm. If the aramid pulp 3000 is below the above range, the strength and elastic modulus of the cam sprocket composite may decrease, and if the aramid pulp 3000 is above the above range, compounding of the cam sprocket composite may be difficult.

The aramid pulp 3000 may be, for example, selected from the group consisting of phosphate-based, carboxylate-based, sulfate-based, sulphonate-based aramid pulp, and combinations thereof.

The aramid pulp 3000 may be included in an amount of 7 to 15 parts by weight based on the total weight of the composite composition for a cam sprocket. If the aramid pulp (3000) is less than 7 parts by weight, the strength and modulus of elasticity of the composite material for the cam sprocket may decrease, and if the aramid pulp (3000) is more than 15 parts by weight, the elongation at break decreases, and the compressive strength of the composite material for the cam sprocket may decrease. Torque increases during pounding, which may reduce productivity.

The antioxidant 4000 may suppress oxidation reactions when extruding and injection processing the composite material for the cam sprocket. The antioxidant 4000 may be, for example, a phenol-based compound or a phosphorus-based compound. Antioxidants (4000) are, for example, Tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methane, Tris(2,4-di-tert-butylphenyl) phosphite, Tris(Nonylphenyl) phosphites , Phenyldiisodecylphosphite, and combinations thereof.

The antioxidant 4000 may be included in an amount of 0.1 to 1.0 parts by weight based on the total weight of the composite composition for a cam sprocket. If the antioxidant (4000) is less than 0.1 part by weight, the physical properties of the cam sprocket composite composition are poor, making it difficult to use as a cam sprocket, and if the antioxidant (4000) is more than 1.0 parts by weight, there is a problem with the appearance quality of the cam sprocket composite. It can happen.

The heat-resistant stabilizer 5000 is a component that provides long-term heat resistance to the part, and can improve long-term heat resistance when the composite material for the cam sprocket is exposed to high temperatures. The heat-resistant stabilizer 5000 may be, for example, a sulfur-based compound. The heat-resistant stabilizer 5000 may be, for example, Pentaerythrityl tetrakis(3-laurylthiopropionate).

The heat-resistant stabilizer 5000 may be included in an amount of 0.1 to 1.0 parts by weight based on the total weight of the composite composition for a cam sprocket. If the heat-resistant stabilizer 5000 is less than 0.1 part by weight, the heat aging resistance of the cam sprocket composite may deteriorate, and if the heat-resistant stabilizer 5000 is more than 1.0 parts by weight, the appearance quality and physical properties of the cam sprocket composite may deteriorate.

The lubricant 6000 may improve the fluidity and release properties of the resin including the aramid fiber 2000 and the aramid pulp 3000. The lubricant 6000 may be, for example, an olefin-based compound. The lubricant 6000 may be, for example, selected from the group consisting of ethylene bis stearamide, glycerin fatty acid ester, fatty acid ester, fatty alcohol, and combinations thereof.

The lubricant 6000 may be included in an amount of 0.1 to 0.5 parts by weight based on the total weight of the composite composition for a cam sprocket. If the lubricant (6000) is less than 0.1 part by weight, the fluidity and release properties of the resin including the aramid fiber (2000) and aramid pulp (3000) are reduced, and if the lubricant (6000) is more than 0.5 part by weight, the cam sprocket composite material Deterioration of physical properties and deterioration of fusion strength may occur.

The composite composition for a cam sprocket according to an embodiment of the present invention may further include a nucleating agent. The nucleating agent may be, for example, a sorbitol-based compound. For example, the nucleating agent may be selected from the group consisting of Di(p-methylbenzylidene) Sorbitol, Di(p-ethylbenzylidene)Sorbitol, Bis(3,4-dimethylbenzylidene)sorbitol, and combinations thereof.

The cam sprocket according to an embodiment of the present invention, except for the metal inserts, is made of a composite material made from the composite composition for a cam sprocket according to an embodiment of the present invention, thereby achieving weight reduction and reducing noise when the engine is driven. there is. In addition, while being lightweight, it can have excellent tensile strength, elongation at break, flexural strength, flexural modulus, impact strength, heat distortion temperature, tensile strength after heat resistance, and compounding workability.

Referring to Figures 1 and 3, the cam sprocket according to an embodiment of the present invention, unlike the conventional cam sprocket, does not protrude in the center of the cam sprocket in a portion that is fastened to the flange, thereby dispersing stress and forming the cam sprocket. durability can be improved.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are merely examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Examples 1 to 3 and Comparative Examples 1 to 9

Phenol, aramid fiber, aramid pulp, antioxidant, heat stabilizer, lubricant, and nucleating agent were mixed in parts by weight shown in Table 1 below to prepare composite materials for cam sprockets of Examples 1 to 3 and Comparative Examples 1 to 9.

Phenolic
compound aramid fiber aramid pulp Oxidation
preventer heat resistance
stabilizator active nuclear agent Example 1 57 30 10 One One 0.4 0.6 Example 2 58.6 30 10 0.3 0.1 0.4 0.6 Example 3 58.4 30 10 0.3 0.5 0.2 0.6 Comparative Example 1 69 30 - - 0.1 0.3 0.6 Comparative Example 2 58.8 30 10 0.1 0.1 0.4 0.6 Comparative Example 3 57.4 30 10 1.5 0.1 0.4 0.6 Comparative Example 4 58.5 30 10 0.5 - 0.4 0.6 Comparative Example 5 56.5 30 10 0.5 2 0.4 0.6 Comparative Example 6 58.4 10 30 0.5 0.1 0.4 0.6 Comparative Example 7 58.4 35 5 0.5 0.1 0.4 0.6 Comparative Example 8 57.6 30 10 0.5 0.5 0.8 0.6 Comparative Example 9 58.4 30 10 0.5 0.5 - 0.6

Physical property measurement

For the cam sprocket composites of Examples 1 to 3 and Comparative Examples 1 to 9, specific gravity, tensile strength, elongation at break, flexural strength, flexural modulus, IZOD impact strength, heat distortion temperature (HDT), tensile strength after heat resistance, com Pounding workability was measured, and the results are shown in Tables 2 and 3.

Specific gravity is ISO 1183, tensile strength is ASTM D638, elongation at break is ASTM D638, flexural strength is ASTM D790, flexural modulus is ASTM D790, IZOD impact strength is ASTM D648, heat deflection temperature (HDT) is ISO 75, after heat resistance. Tensile strength was measured using the ASTM D638 method. Compounding workability was measured by moldability.

Experiment result

importance tensile strength
(MPa) Elongation at break
(%) flexural strength
(MPa) flexural modulus
(MPa) Example 1 1.42 265 2.1 425 17,000 Example 2 1.42 251 2 407 16,100 Example 3 1.42 255 2 415 16,700 Comparative Example 1 1.42 209 1.7 335 13,800 Comparative Example 2 1.42 220 1.7 340 15,000 Comparative Example 3 1.42 255 1.9 400 16,800 Comparative Example 4 1.42 235 1.8 374 14,500 Comparative Example 5 1.42 180 0.7 360 16,000 Comparative Example 6 Compounding work is not possible Comparative Example 7 1.51 210 1.6 340 17,700 Comparative Example 8 1.42 191 2.4 350 15,000 Comparative Example 9 Compounding work is not possible

IZOD
impact strength
(J/m) Heat distortion temperature (1.8MPa)
(℃) After heat resistance
tensile strength
(MPa) compounding
Workability Example 1 57 252 147 Good Example 2 58.6 255 122 Good Example 3 110.2 255 115 Good Comparative Example 1 106.4 260 110 Good Comparative Example 2 105.5 258 85 Good Comparative Example 3 100.2 253 151 Good Comparative Example 4 102.1 253 90 Good Comparative Example 5 49.2 253 155 Good Comparative Example 6 Compounding work is not possible error Comparative Example 7 97.4 252 128 error Comparative Example 8 110.5 250 144 Good Comparative Example 9 Compounding work is not possible error

1. Referring to Tables 2 and 3, it was confirmed that Comparative Example 1 did not add aramid pulp and had a flexural modulus of less than 16,000 MPa, making it unsuitable as a composite material for cam sprockets. Comparative Example 6 could not be produced due to excessive addition of aramid pulp. In Comparative Example 7, it was confirmed that the specific gravity increased and the compounding workability was reduced by adding a small amount of aramid pulp and an excessive amount of aramid fiber.

2. In Comparative Example 2, the amount of antioxidant added was small, so the tensile strength after heat resistance was lowered, and in Comparative Example 3, the amount of antioxidant added was excessive, and it was confirmed that the physical properties of impact strength were lowered.

3. In Comparative Example 4, no heat stabilizer was added, and the tensile strength decreased after heat resistance. In Comparative Example 5, it was confirmed that the elongation at break and impact strength were reduced due to the addition of an excessive amount of heat-resistant stabilizer.

4. In Comparative Example 8, it was confirmed that the flexural modulus was less than 16,000 MPa and the flexural strength was low due to the addition of an excessive amount of lubricant. In Comparative Example 9, it was confirmed that compounding workability was poor because no lubricant was added.

Above, embodiments of the present invention have been described with reference to the attached drawings, but those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will understand that it exists. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

CSO: Conventional cam sprocket CSC: Composite composition for cam sprocket
CS: Cam sprocket of the present invention LH: Fastening holes
1000: Phenolic compound 2000: Aramid fiber
3000: Aramid pulp 4000: Antioxidant
5000: Heat-resistant stabilizer 6000: Lubricant
100: Outer part 110: Outer surface of the outer part
120: inner surface of outer portion 200: middle portion
210: outer surface of the middle portion 220: inner surface of the middle portion
300: metal inserts 500: flange

Claims (10)

45 to 60 parts by weight of a phenolic compound;
25 to 33 parts by weight of aramid fiber;
7 to 15 parts by weight of aramid pulp;
0.1 to 1.0 parts by weight of antioxidant;
0.1 to 1.0 parts by weight of heat-resistant stabilizer; and
A composite composition for a cam sprocket comprising 0.1 to 0.5 parts by weight of a lubricant. According to paragraph 1,
The aramid fiber is
diameter between 9 and 14 μm; and
A composite composition for a cam sprocket having a length of 6 to 8 mm. According to paragraph 1,
The aramid pulp is
diameter from 2 to 5 μm; and
A composite composition for a cam sprocket having a length of 0.4 to 1.1 mm. According to paragraph 1,
The antioxidant is
Tetrakis [methylene(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methane, Tris(2,4-di-tert-butylphenyl) phosphite, Tris(Nonylphenyl) phosphites, Phenyldiisodecylphosphite and combinations thereof. A composite composition for a selected cam sprocket. According to paragraph 1,
The heat-resistant stabilizer is
Pentaerythrityl tetrakis(3-laurylthiopropionate) composite composition for cam sprockets. According to paragraph 1,
The lubricant
A composite composition for a cam sprocket selected from the group consisting of ethylene bis stearamide, glycerin fatty acid ester, fatty acid ester, fatty alcohol, and combinations thereof. According to paragraph 1,
The composite composition is
A composite composition for a cam sprocket further comprising a nucleating agent. In clause 7,
The nucleating agent
A composite composition for a cam sprocket selected from the group consisting of Di(p-methylbenzylidene) Sorbitol, Di(p-ethylbenzylidene)Sorbitol, Bis(3,4-dimethylbenzylidene)sorbitol, and combinations thereof. an outer portion whose outer surface has a sawtooth shape;
a middle portion connected to the inner surface of the outer portion; and
It includes metal inserts inserted into a plurality of fastening holes provided inside the middle portion,
The outer portion surrounds the middle portion,
The metal inserts are fastened to the flange,
A cam sprocket wherein each of the outer portion and the middle portion includes the composite composition of claim 1. According to clause 9,
From the center of the cam sprocket,
A cam sprocket wherein the distance to the inner surface of the intermediate portion is constant.