KR20190123022A - Cover spindle for vehicle - Google Patents

Abstract

The present invention relates to a cover spindle for an automobile. In an embodiment, the cover spindle for an automobile contains 90 to 95 wt% of polyphenylene sulfide (PPS) and 5 to 10 wt% of an ethylene-glycidyl(meth)acrylate copolymer. The cover spindle for an automobile of the present invention has an excellent power transmission effect, a noise reduction effect, and heat resistance stability, and has excellent light weight, durability, and mechanical strength.

Description

Car Cover Spindle {COVER SPINDLE FOR VEHICLE}

The present invention relates to a cover spindle for an automobile.

Integrated Mobis electronic Brake (iMEB) is a device that detects the driver's pedal signal as an electronic signal, and the motor rotates the ball screw to apply a force to the cylinder to operate the caliper brake.

At this time, a cover spindle is applied between the motor and the ball screw. The cover spins are provided between the shaft of the motor and the assembly clearance of the ball screw spindle serration, and serve to reduce noise while transmitting basic motor power to the ball screw. These cover spins require noise reduction, heat resistance and dimensional stability.

Prior art related to the present invention is Republic of Korea Patent Publication No. 10-1706933 (August 15, 2017, the name of the invention: the caliper of the disc brake).

One object of the present invention is to provide a cover spin for an automobile having excellent power transmission effect, excellent noise reduction effect and heat stability.

Another object of the present invention is to provide automotive cover spins having excellent light weight, durability and mechanical strength.

It is still another object of the present invention to provide automotive cover spins having excellent dimensional stability and eco-friendliness without corroding peripheral components.

Still another object of the present invention is to provide automotive cover spins having excellent productivity and economy.

One aspect of the invention relates to automotive cover spindles. In one embodiment, the automotive cover spins include 90 to 95% by weight of polyphenylene sulfide (PPS) and 5 to 10% by weight of ethylene-glycidyl (meth) acrylate copolymer.

In one embodiment the automotive cover spins further comprises 1 to 10% by weight of a first polymer, the first polymer being ethylene-octene rubber (EOR), ethylene-butylene rubber (EBR), ethylene-propylene-diene -At least one of rubber (EPDM) and styrene-ethylene-butylene-styrene copolymer (SEBS).

In one embodiment, the polyphenylene sulfide (PPS) may have a weight average molecular weight of 30,000 ~ 80,000g / mol.

In one embodiment, the automotive cover spins may have a heat deflection temperature of 98 ° C. or higher, measured in accordance with ASTM D648, and a specific gravity of 1.20˜1.30, measured in accordance with ASTM D792.

In one embodiment, the automotive cover spins may have a tensile strength of 40 MPa or more measured according to ASTM D638, and an Izod impact strength of 6 mm thick specimens measured according to ASTM D256 may be 50 J / m or more.

In one embodiment, the automotive cover spins may have a flexural strength of 60 MPa or more based on ASTM D790 and a flexural modulus of 1800 MPa or more based on ASTM D790.

In one embodiment, the automotive cover spins may have a shrinkage ratio of specimen gate direction (MD) of 0.3 mm or less measured on a specimen having a thickness of 3.2 mm and a diameter of 100 mm based on ASTM D855.

Automotive cover spins of the present invention has excellent power transmission effect, excellent noise reduction effect and heat resistance stability, light weight, excellent durability and mechanical strength, low shrinkage rate, excellent dimensional stability, metal and glass fiber, etc. Does not contain the inorganic components of the environment, while preventing the contamination and corrosion of the surrounding parts, it can be excellent in environmental friendliness, productivity and economy.

Figure 1 (a) shows the automotive cover spins according to an embodiment of the present invention, Figure 1 (b) shows the automotive cover spins according to an embodiment of the present invention, Figure 1 (c) is A cross section of a cover spin for an automobile according to an embodiment of the present invention is shown.

Hereinafter, with reference to the accompanying drawings, it will be described embodiments of the present application in more detail. However, the technology disclosed in the present application is not limited to the embodiments described herein and may be embodied in other forms.

It is merely to be understood that the embodiments introduced herein are provided so that the disclosure can be made thorough and complete, and the spirit of the present application to those skilled in the art will be fully communicated. In the drawings, the width, thickness, and the like of the components are enlarged in order to clearly express the components of each device. In addition, although only a part of the components are shown for convenience of description, those skilled in the art will be able to easily understand the rest of the components.

When described in the drawings as a whole, at the point of view of the observer, and when one element is referred to as being above or below another element, it is said that one element is located directly above or below another element or there is an additional element between them. It includes everything that can be done. In addition, one of ordinary skill in the art may implement the spirit of the present application in various other forms without departing from the technical spirit of the present application. In addition, in the drawings, the same reference numerals refer to substantially the same elements.

"(Meth) acrylate" in the present invention means that both "acrylate" and "methacrylate" are possible.

For car Cover spindle

One aspect of the invention relates to automotive cover spindles. Figure 1 (a) is seen from one side of the car cover spins according to one embodiment of the present invention, Figure 1 (b) is seen from the other side of the car cover spins according to one embodiment of the invention, Figure 1 (c) shows a cross section of a cover spindle for an automobile according to an embodiment of the present invention.

Referring to FIG. 1, an automobile cover spindle 100 may be interposed between a motor and a ball screw. For example, the cover spins 100 may be interposed between the shaft of the motor and the assembly clearance of the ball screw spindle serration, and may serve to reduce noise while transmitting power of the motor to the ball screw. Referring to FIG. 1 (c), the thickness T of the cover spins 100 may be 0.1 mm or more. For example, it may be 0.5 mm or more. The thickness T may be a distance between the valley a of the gear formed on the outer circumferential surface of the cover spins 100 and the inner circumferential surface. When formed in the thickness range, the mechanical rigidity of the present invention, noise reduction effect can be excellent.

In one embodiment, the automotive cover spins include 90 to 95% by weight of polyphenylene sulfide (PPS) and 5 to 10% by weight of ethylene-glycidyl (meth) acrylate copolymer. In one embodiment of the present invention, the automotive cover spins may not include an inorganic component such as metal and glass fiber. Under the above conditions, corrosion and contamination of the parts surrounding the cover spindle may be prevented.

The polyphenylene sulfide (PPS) is included in the present invention to secure both rigidity and heat resistance at the same time. In one embodiment, the polyphenylene sulfide may have a weight average molecular weight of 30,000 to 80,000 g / mol. Heat and mechanical properties may be excellent in the weight average molecular weight range.

For example, the polyphenylene sulfide (PPS) may be a melting temperature of 270 ~ 285 ℃, HDT (heat deformation temperature) of 100 ℃ or more. Under the above conditions, the moldability, blendability, heat resistance and mechanical strength of the present invention may be excellent.

The ethylene-glycidyl (meth) acrylate copolymer is included to ensure noise reduction characteristics when driving the cover spins of the present invention. In one embodiment, the ethylene-glycidyl (meth) acrylate copolymer may be included in the form of a block copolymer.

In one embodiment, the automotive cover spins may further include a first polymer. The first polymer comprises at least one of ethylene-octene rubber (EOR), ethylene-butylene rubber (EBR), ethylene-propylene-diene-rubber (EPDM) and styrene-ethylene-butylene-styrene copolymer (SEBS). Include.

In one embodiment, the first polymer may be included in an amount of about 1 wt% to about 10 wt%, based on the total weight of the cover span for the vehicle. When included in the above range, the durability, blendability and noise reduction characteristics of the present invention can be excellent. For example, it may be included in 1 to 6% by weight.

In one embodiment, the ethylene-glycidyl (meth) acrylate copolymer has a flow index of 12 to 35 g / 10 min (based on ASTM D1238, measured at 220 ° C. and 2.16 kg) and a density of 0.91 to 0.95 g / cm ³ May be a condition. Under the above conditions, while excellent in moldability and mixing property of the present invention, the noise reduction effect may be excellent at the same time.

In one embodiment, the first polymer has a flow index of 12 to 35 g / 10 min (based on ASTM D1238, measured at 220 ° C. and 2.16 kg) and a density of 0.91 to 0.95 g / cm ³ May be a condition. Under the above conditions, while excellent in moldability and mixing property of the present invention, the noise reduction effect may be excellent at the same time.

In one embodiment the coverspins comprise 90 to 95 weight percent polyphenylenesulfide (PPS) and 5 to 10 weight percent ethylene-glycidyl (meth) acrylate. When the content of the ethylene-glycidyl (meth) acrylate is included in less than 5% by weight, the noise reduction effect during driving is lowered, the ethylene-glycidyl (meth) acrylate in excess of 10% by weight When the heat resistance is lowered, the power transmission efficiency is lowered in the driving environment (-40 ° C. to 100 ° C.), the appearance may be deformed, and noise may increase. For example, it may be included in 5 to 8% by weight.

In one embodiment, the automotive cover spins may have a heat deflection temperature of 98 ° C. or higher, measured in accordance with ASTM D648, and a specific gravity of 1.20˜1.30, measured in accordance with ASTM D792. For example, the automotive cover spins may have a heat deflection temperature of 98 to 110 ° C. measured according to ASTM D648, and a specific gravity of 1.25 to 1.30 measured according to ASTM D792.

In one embodiment, the automotive cover spins have a tensile strength of 40 MPa or more measured according to ASTM D638, and an Izod impact strength of 6 mm thick specimens measured according to ASTM D256 is 50 J / m. It may be abnormal. For example, the automotive cover spins may have a tensile strength of 40 to 70 MPa measured according to ASTM D638, and an Izod impact strength of a 6 mm thick specimen measured according to ASTM D256 may be 50 to 80 J / m. For example, the automotive cover spins may have a tensile strength of 45 to 60 MPa measured in accordance with ASTM D638, and an Izod impact strength of 6 mm thick specimens measured in accordance with ASTM D256 may be 55 to 80 J / m.

In one embodiment, the automotive cover spins may have a flexural strength of 60 MPa or more based on ASTM D790 and a flexural modulus of 1800 MPa or more based on ASTM D790. For example, the automotive cover spins may have a flexural strength of 60 to 80 MPa based on ASTM D790 and a flexural modulus of 1800 to 2400 MPa based on ASTM D790.

In one embodiment, the automotive cover spins may have a shrinkage ratio of specimen gate direction (MD) of 0.3 mm or less measured on a specimen having a thickness of 3.2 mm and a diameter of 100 mm based on ASTM D855. For example, the shrinkage of the specimen gate direction MD and the shrinkage of the specimen gate vertical direction TD may be 0.3% or less, respectively. For example, it may be 0 to 0.20%, respectively.

Automotive cover spins of the present invention is excellent in power transmission effect, excellent noise reduction effect and heat resistance stability, light weight, excellent durability and mechanical strength, low shrinkage rate, excellent dimensional stability, excellent environmental friendliness In addition, productivity and economy can be excellent.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Example  And Comparative example

The components used in Examples and Comparative Examples of the present invention are as follows.

(A) Polyphenylene sulfide: A weight average molecular weight: 30,000-80,000 g / mol was used.

(B) Ethylene-glycidyl (meth) acrylate copolymer: flow index of 12 to 35 g / 10 min (measured at ASTM D1238, 220 ° C., 2.16 kg) And an ethylene-glycidyl (meth) acrylate copolymer (EGMA) with a density of 0.94 g / cm ³ .

Example  1 and 2 and Comparative example  1 ~ 2

The polyphenylene sulfide (A) and the ethylene-glycidyl (meth) acrylate copolymer (B) were introduced into the twin screw extruder in the amounts shown in Table 1 below, and the extrusion part temperature: 290 ° C., hopper and melting Sub-temperature: Extruded in the form of pellets under the conditions of 330 ℃, the extrusion pellet was injection molded to produce a cover pin for automobiles of the type shown in FIG.

Property evaluation

About Examples 1 and 2 and Comparative Examples 1 and 2, physical properties were evaluated by the following method, and the results are shown together in Table 1 below.

(1) Specific gravity: It measured based on ASTMD792 standard.

(2) Tensile strength (MPa): measured according to ASTM D638 standard.

(3) Elongation (%): measured according to ASTM D638 standard.

(4) Flexural Strength (MPa) and Flexural Modulus (MPa): Measured according to ASTM D790 standard.

(5) Heat Deflection Temperature (° C): Measured according to ASTM D648 standard.

(6) Impact strength (J / m): measured according to the ASTM D256 standard.

(7) Operation noise (dB): The brake system (iMEB) of Hyundai Mobis Corporation was prepared inside the anechoic chamber, and the example and comparative cover spins were placed between the motor and the ball screw, and the brake was operated. At this time, it operated under the condition of external input speed: 70 ~ 100mm / s, and pedal operation speed: 10 ~ 100mm / s, using a portable noise measuring instrument (manufactured by TES, product name: TES-1350A) at a distance of 30cm from the brake system. Measured. On the other hand, the requirements of operating noise: 70 dB or less.

(8) Shrinkage (MD direction): Measured according to ASTM D855 standard. Specifically, according to the ASTM D855 standard prepared in each of the disk examples (diameter 100mm, thickness 3.2mm) Examples and Comparative Examples 5 injection specimens, after measuring the size of the specimen after the injection 24 hours to determine the shrinkage according to the following formula 1 Measured:

[Equation 1]

% Shrinkage in specimen gate direction = ((length between mold graduations-length between injection specimen graduations) / length between mold graduations) x 100.

Referring to the results of Table 1, in Examples 1 to 2 of the present invention, it was found that the mechanical properties are excellent, and the operating noise is lower than that of the comparative example. However, in the case of Comparative Example 1 exceeding the content of the ethylene-glycidyl (meth) acrylate copolymer of the present invention, the noise reduction effect was greatly reduced, the strength and heat resistance were lowered, and ethylene-glycidyl (meth In the case of Comparative Example 2 without the acrylate copolymer, it was found that the noise reduction effect was significantly reduced.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (7)

Automotive cover spindles comprising 90 to 95% by weight of polyphenylene sulfide (PPS) and 5 to 10% by weight of ethylene-glycidyl (meth) acrylate copolymer.
The method of claim 1, wherein the automotive cover spins further comprises 1 to 10% by weight of the first polymer,
The first polymer comprises at least one of ethylene-octene rubber (EOR), ethylene-butylene rubber (EBR), ethylene-propylene-diene-rubber (EPDM) and styrene-ethylene-butylene-styrene copolymer (SEBS). Cover spindle for the vehicle comprising a.
The cover spindle of claim 1, wherein the polyphenylene sulfide (PPS) has a weight average molecular weight of 30,000 to 80,000 g / mol.
The cover coil of claim 1, wherein the cover spans for automobiles have a heat deflection temperature of 98 ° C. or higher and a specific gravity of 1.20 to 1.30, which is measured according to ASTM D792.
The method of claim 1, wherein the automotive cover spins have a tensile strength of 40 MPa or more measured according to ASTM D638, the Izod impact strength of the 6mm thick specimen measured according to ASTM D256 is 50 J / m or more Car cover spindles.
The cover span for automobiles according to claim 1, wherein the cover spans for automobiles have a flexural strength of 60 MPa or more and a flexural modulus of 1800 MPa or more, based on ASTM D790.
According to claim 1, The automotive cover spins automotive cover spines, characterized in that the shrinkage of the specimen gate direction (MD) of 0.3mm or less measured on a specimen having a thickness of 3.2mm, 100mm in accordance with ASTM D855.

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