KR100980971B1 - Tone Wheel For Speed Sensor And Manufacturing Method Thereof - Google Patents

Tone Wheel For Speed Sensor And Manufacturing Method Thereof Download PDF

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Publication number
KR100980971B1
KR100980971B1 KR1020080040669A KR20080040669A KR100980971B1 KR 100980971 B1 KR100980971 B1 KR 100980971B1 KR 1020080040669 A KR1020080040669 A KR 1020080040669A KR 20080040669 A KR20080040669 A KR 20080040669A KR 100980971 B1 KR100980971 B1 KR 100980971B1
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South Korea
Prior art keywords
tone wheel
speed sensor
wheel
tone
present
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KR1020080040669A
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Korean (ko)
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KR20090114823A (en
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이기수
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현대자동차주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/86—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration wherein the brakes are automatically applied in accordance with a speed condition and having means for overriding the automatic braking device when a skid condition occurs

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Regulating Braking Force (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

본 발명은 스피드 센서용 톤휠에 관한 것으로서, 비자성체인 몸체(220)와; 상기 몸체(220)의 둘레에 일정간격으로 도포된 자성체도료부(210);를 포함하여 구성되는 것을 특징으로 하는 스피드 센서용 톤휠에 관한 것이다.The present invention relates to a tone wheel for a speed sensor, the body 220 of the non-magnetic body; It relates to a ton wheel for a speed sensor, characterized in that it comprises a; a magnetic material coating portion 210 applied at a predetermined interval around the body 220.

상기와 같이 본 발명인 톤휠(200)은 플라스틱 몸체에 자성체 도료를 도색하는 형태로서 중량절감과 원가절감의 효과가 있고, 금형비 절감 및 생산성이 향상되며, 톤휠 둘레에 이물질이 유입되지 않아 센싱 불량이 발생되지 않는 효과가 있다.As described above, the present invention, the tone wheel 200 has a form of the magnetic material paint on the plastic body, and has the effect of weight reduction and cost reduction, reduced mold cost and productivity, and foreign substances do not flow around the ton wheel, resulting in poor sensing. There is no effect.

스피드, 센서, 톤휠, 자성체, 이물질 Speed, Sensor, Tone Wheel, Magnetic Material, Foreign Material

Description

스피드 센서용 톤휠 및 그 제작방법{Tone Wheel For Speed Sensor And Manufacturing Method Thereof}Tone wheel for speed sensor and manufacturing method {Tone Wheel For Speed Sensor And Manufacturing Method Thereof}

본 발명은 스피드 센서용 톤휠 및 그 제작방법에 관한 것이다.The present invention relates to a tone wheel for a speed sensor and a method of manufacturing the same.

일반적으로 제동장치(break system)는 주행하는 자동차를 감속 또는 정지시킴과 동시에 주차 상태를 유지하기 위해 사용되는 중요한 장치이며, 마찰력을 이용하여 자동차의 운동에너지를 열에너지로 바꾸는 마찰식 브레이크가 사용되고 있다.In general, a brake system is an important device used to maintain a parking state at the same time as decelerating or stopping a driving vehicle, and a friction brake is used to convert kinetic energy of a vehicle into thermal energy using frictional force.

그리고 최근의 자동차는 고속화 경향으로 드럼식 보다 방열과 열변형에 의한 제동력 저하가 적은 디스크 브레이크가 많이 사용되고 있으며, 특히 앞쪽 브레이크는 거의 디스크 브레이크가 사용되고 있다.In recent automobiles, disc brakes having less braking force due to heat dissipation and thermal deformation are used more frequently than drum type, and in particular, the front brakes are almost used.

한편, 상기 디스크 브레이크를 포함하는 제동장치는 브레이크 폐달과, 상기 브레이크 폐달에 연결되는 부스터와, 상기 부스터와 연결되는 마스터 실린더와, 상기 마스터 실린더와 연결되는 전후륜 브레이크로 구성된다.Meanwhile, the braking device including the disc brake includes a brake pedal, a booster connected to the brake pedal, a master cylinder connected to the booster, and a front and rear wheel brake connected to the master cylinder.

특히, 상기 제동장치의 제동시 슬립을 방지하기 위해, 안티록 브레이크 장치(ABS : Antilock Brake System)가 개발되었는데, 이는 휠 스피드 센서로 휠의 회전 속도를 체크하면서 록킹되지 않도록 브레이크 유압을 제어하는 장치이다.In particular, in order to prevent slip during braking of the braking device, an antilock brake system (ABS) has been developed, which is a device for controlling brake oil pressure so that it is not locked while checking the rotational speed of the wheel with a wheel speed sensor. to be.

도 1은 종래 스피드 센서와 톤휠을 나타내는 사시도이다.1 is a perspective view illustrating a conventional speed sensor and a tone wheel.

도시된 바와 같이, 스피드 센서(10)는 마그네트(12) 및 이와 연결된 풀핀(14)으로 구성되며, 브레이크 디스크(미도시)에 연동되도록 설치된 톤휠(20)은 그 외주면에 돌출 형성된 다수의 치(22)로 구성된다.As shown, the speed sensor 10 is composed of a magnet 12 and a pull pin 14 connected thereto, and the tone wheel 20 installed to interlock with a brake disc (not shown) includes a plurality of teeth protruding from the outer circumferential surface thereof. 22).

그리고 톤휠(20)의 치(22)와 일정간격 이격되어 위치된 상기 스피드 센서(10)는 회전하는 상기 치(22)의 개수를 감지함으로써 휠의 회전속도를 연산할 수 있게 된다.In addition, the speed sensor 10, which is spaced apart from the teeth 22 of the tone wheel 20 by a predetermined distance, may calculate the rotation speed of the wheel by detecting the number of the teeth 22 that rotate.

도 2는 종래의 톤휠을 나타내는 사시도이고, 이 중 도 2의 (a)는 분말소결합금으로 만든 톤휠이고, 도 2의 (b)는 프레스 가공을 통하여 만든 톤휠이다.Figure 2 is a perspective view showing a conventional tone wheel, of which Figure 2 (a) is a tone wheel made of powdered alloy, Figure 2 (b) is a tone wheel made through the press working.

그러나, 상기 도 2의 (a)에 도시된 톤휠(20)은 치(22) 뿐만 아니라, 상기 치(22)와 치(22) 사이의 본체홈부분(24) 주위도 분말소결합금으로 이루어져 있어 재료비가 비싸고 무게가 무거우며, 상기 본체홈부분(24)에 이물질이 유입되어 톤휠(20) 회전을 감지하는 스피드 센서(10)의 기능을 방해하는 문제가 있다.However, the tone wheel 20 shown in (a) of FIG. 2 is made of powdered sintered alloy as well as the teeth 22 and also around the body groove 24 between the teeth 22 and the teeth 22. The material cost is high and the weight is heavy, there is a problem that the foreign matter is introduced into the main body groove portion 24 to interfere with the function of the speed sensor 10 for detecting the rotation of the tone wheel (20).

그리고 상기 도 2의 (b)에 도시된 톤휠(20)은 360도 방사형으로 형성되는 홀(26)을 만들기 위해 펀칭 작업을 한 번에 해야 하기 때문에 성형하기가 힘들고, 금형비가 많이 드는 문제가 있다.In addition, the tone wheel 20 shown in FIG. 2 (b) has a problem in that it is difficult to mold because the punching operation must be performed at one time to make the hole 26 formed in a 360 degree radial shape, and the mold cost is high. .

본 발명은 중량, 원가 및 금형비가 절감되고, 생산성이 우수하며, 톤휠의 홈에 이물질이 유입되지 않는 구조를 가진 센서용 톤휠 및 그 제작방법을 제공하는 것을 목적으로 한다.It is an object of the present invention to provide a sensor tone wheel and a manufacturing method thereof having a structure in which weight, cost and mold cost are reduced, productivity is excellent, and foreign substances do not flow into the groove of the tone wheel.

본 발명인 스피드 센서용 톤휠은 비자성체인 몸체(220)와;Tone wheel for the speed sensor of the present invention is a non-magnetic body 220 and;

상기 몸체(220)의 둘레에 일정간격으로 도포된 자성체도료부(210);Magnetic body coating portion 210 is applied to the circumference of the body 220 at a predetermined interval;

를 포함하여 구성되는 것을 특징으로 하는 스피드 센서용 톤휠을 제공한다.It provides a tone wheel for a speed sensor, characterized in that configured to include.

그리고 상기 몸체(220)는 플라스틱으로 이루어질 수 있다.The body 220 may be made of plastic.

또한, 본 발명은 원통(232)의 둘레에 일정간격으로 자성체도료부(210)를 형성하여 원통톤휠(240)을 만드는 과정을 포함하는 것을 특징으로 하는 스피드 센서용 톤휠의 제작방법도 제공한다.In addition, the present invention also provides a manufacturing method of the tone wheel for a speed sensor, comprising the step of forming a cylindrical tone wheel 240 by forming a magnetic coating portion 210 at a predetermined interval around the cylinder 232.

상기 스피드 센서용 톤휠의 제작방법은 사출을 통하여 상기 원통(232)을 만드는 과정을 포함할 수 있고, 상기 원통톤휠(240)을 복수개의 톤휠(200)로 절단하는 과정을 포함할 수 있다.The method of manufacturing the speed sensor tone wheel may include a process of making the cylinder 232 through injection, and may include cutting the cylindrical tone wheel 240 into a plurality of tone wheels 200.

상기와 같이 본 발명인 톤휠은 플라스틱 몸체에 자성체 도료를 도색하는 형 태로서 중량절감과 원가절감의 효과가 있고, 금형비 절감 및 생산성이 향상되며, 톤휠 둘레에 이물질이 유입되지 않아 센싱 불량이 발생되지 않는 효과가 있다.As described above, the present invention is a tone wheel in the form of coating the magnetic paint on the plastic body has the effect of weight reduction and cost reduction, reducing mold cost and productivity, and foreign matter does not flow around the tone wheel does not cause a bad sensing It works.

이하, 본 발명의 바람직한 실시예를 첨부된 도면들을 참조하여 상세히 설명한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

도 3은 본 발명인 스피드 센서용 톤휠이 장착된 사시도이고, 도 4는 도 3 중 톤휠의 사시도이다.Figure 3 is a perspective view of the present invention is equipped with a tone wheel for the speed sensor, Figure 4 is a perspective view of the tone wheel in Figure 3.

도 3과 같이 본 발명인 스피드 센서용 톤휠(200)은 스피드 센서(100)에 인접하게 마련되는데, 브레이크 디스크와 연동되도록 설치된 상기 톤휠(200)의 구조는 상기 스피드 센서(100)에서 감지되는 외주면이 요철이 없는 매끄러운 곡면이며 비자성체인 플라스틱으로 이루어진 몸체(220)와, 상기 몸체(220)의 외주면에 일정간격으로 도포된 자성체도료부(210)를 포함하여 구성된다.As shown in FIG. 3, the present invention provides a speed sensor tone wheel 200 adjacent to a speed sensor 100. The structure of the tone wheel 200 installed to interlock with a brake disc has an outer circumferential surface detected by the speed sensor 100. It comprises a body 220 made of a plastic, which is a smooth curved surface having no irregularities and a nonmagnetic material, and a magnetic body coating portion 210 applied to the outer circumferential surface of the body 220 at a predetermined interval.

따라서, 상기 몸체(220)의 외주면은 몸체(220)의 일부인 비자성체와 상기 자성체도료부(210)가 번갈아 형성되는 구조이다.Therefore, the outer circumferential surface of the body 220 is a structure in which the non-magnetic material and the magnetic paint portion 210 which are part of the body 220 are alternately formed.

상기 톤휠(200)의 제작공정을 통하여 톤휠(200)의 구조를 좀더 명확히 설명 하면 다음과 같다.The structure of the tone wheel 200 through the manufacturing process of the tone wheel 200 more clearly described as follows.

도 5는 본 발명인 스피드 센서용 톤휠의 제작공정을 나타내는 공정도이고, 도 6은 도 5의 순서도이다.FIG. 5 is a process chart showing a manufacturing process of a speed sensor tone wheel of the present invention, and FIG. 6 is a flowchart of FIG.

톤휠(200)의 제작공정은 제 1 단계(S100)인 사출과정과, 제 2 단계(S200)인 도색과정 및 제 3 단계(S300)인 절단과정을 포함하여 구성된다.The manufacturing process of the tone wheel 200 includes an injection process of the first step S100, a painting process of the second step S200, and a cutting process of the third step S300.

상기 제 1 단계(S100)인 사출과정은 도 5의 (a)와 같이 비자성체인 플라스틱을 사출하여 원통(232)을 만드는 과정이다.
상기 원통(232)은 스피드 센서(100)에서 감지되는 외주면이 요철이 없는 매끄러운 곡면인 형태이다.The injection process of the first step (S100) is a process of making a cylinder 232 by injecting a non-magnetic plastic, as shown in Figure 5 (a).
The cylinder 232 has a shape in which the outer circumferential surface detected by the speed sensor 100 is a smooth curved surface without irregularities.

제 1 단계(S100)를 거친 후에 진행되는 제 2 단계(S200)인 도색과정은 도 5의 (b)와 같이 상기 원통(232)의 외주면에 일정간격으로 자성체 도료를 도색하여 자성체도료부(210)를 형성하는 과정이다.In the painting process, which is the second step (S200), which is performed after the first step (S100), the magnetic material coating part 210 is painted on the outer circumferential surface of the cylinder 232 at a predetermined interval as shown in FIG. ) Is the process of forming.

상기 자성체도료부(210)는 원통(232)의 외주면에 직선형상으로 마련되며, 상기와 같이 원통(232)에 자성체도료부(210)가 형성된 형태를 원통톤휠(240)이라 한다.The magnetic paint portion 210 is provided in a linear shape on the outer peripheral surface of the cylinder 232, the shape of the magnetic coating portion 210 is formed in the cylinder 232 as described above is called the cylindrical tone wheel 240.

제 2 단계(S200)를 거친 후에 진행되는 제 3 단계(S300)인 절단과정은 도 5의 (c)와 같이 상기 제 2 단계(S200)를 거친 원통톤휠(240)을 필요한 톤휠(200)의 크기에 맞게 복수개의 톤휠(200)로 절단하는 과정이다.The cutting process, which is the third step S300 which is performed after the second step S200, is performed by the cylindrical tone wheel 240 which has undergone the second step S200 as shown in FIG. The process of cutting with a plurality of tone wheels 200 to fit the size.

상기 제 1 단계(S100) 내지 제 3 단계(S300)를 거친 후에 완성된 톤휠(200)은 몸체(220)의 외주면에 자성체도료부(210)가 일정간격으로 형성된 구조이다.The tone wheel 200 completed after the first step S100 to the third step S300 has a structure in which the magnetic coating part 210 is formed at a predetermined interval on the outer circumferential surface of the body 220.

그리고 필요한 경우에는 제 1 단계(S100)에서 상기 플라스틱원통(232)을 완성품인 톤휠(200)과 같은 크기로 사출하여 제 3 단계(S300)를 생략할 수도 있다.If necessary, in the first step S100, the plastic cylinder 232 may be injected to the same size as the finished tone wheel 200, and the third step S300 may be omitted.

상기와 같이 본 발명인 톤휠(200)은 플라스틱 몸체에 자성체 도료를 도색하 는 형태로서 중량절감과 원가절감의 효과가 있고, 금형비 절감 및 생산성이 향상되며, 톤휠 둘레에 이물질이 유입되지 않아 센싱 불량이 발생되지 않는 효과가 있다.As described above, the present invention, the tone wheel 200 has a form of the magnetic material paint on the plastic body, and has the effect of weight reduction and cost reduction, reduced mold cost and productivity, and foreign materials do not flow around the ton wheel, resulting in poor sensing. There is an effect that does not occur.

이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정 및 변형이 가능할 것이다. 따라서, 본 발명에 개시된 실시예들은 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시예에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

도 1은 종래 스피드 센서와 톤휠을 나타내는 사시도.1 is a perspective view showing a conventional speed sensor and a tone wheel.

도 2는 종래의 톤휠을 나타내는 사시도.Figure 2 is a perspective view showing a conventional tone wheel.

도 3은 본 발명인 스피드 센서용 톤휠이 장착된 사시도.Figure 3 is a perspective view of the present invention is equipped with a tone wheel for the speed sensor.

도 4는 도 3 중 톤휠의 사시도.4 is a perspective view of the tone wheel of FIG.

도 5는 본 발명인 스피드 센서용 톤휠의 제작공정을 나타내는 공정도.Figure 5 is a process chart showing a manufacturing process of the present invention speed sensor tone wheel.

도 6은 도 5의 순서도.6 is a flow chart of FIG.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

100: 스피드 센서 200: 톤휠100: speed sensor 200: tone wheel

210: 자성체도료부 220: 몸체210: magnetic coating material 220: body

Claims (5)

스피드 센서(100)에서 감지되는 외주면이 요철이 없는 매끄러운 곡면이며 비자성체인 몸체(220)와;An outer circumferential surface detected by the speed sensor 100 is a smooth curved surface having no irregularities and a non-magnetic body 220; 상기 몸체(220)의 외주면에 일정간격으로 도포된 자성체도료부(210);Magnetic body coating portion 210 is applied to the outer peripheral surface of the body 220 at a predetermined interval; 를 포함하여 구성되는 것을 특징으로 하는 스피드 센서용 톤휠.Tone wheel for a speed sensor, characterized in that comprises a. 청구항 1에 있어서,The method according to claim 1, 상기 몸체(220)는 플라스틱으로 이루어진 것을 특징으로 하는 스피드 센서용 톤휠.The body 220 is a tone wheel for a speed sensor, characterized in that made of plastic. 스피드 센서(100)에서 감지되는 외주면이 요철이 없는 매끄러운 곡면인 원통(232)을 형성하는 과정과;Forming an outer circumferential surface detected by the speed sensor 100 having a smooth curved surface without irregularities; 상기 외주면에 일정간격으로 자성체도료부(210)를 형성하여 원통톤휠(240)을 만드는 과정을 포함하는 것을 특징으로 하는 스피드 센서용 톤휠의 제작방법.Forming a magnetic coating portion 210 at a predetermined interval on the outer circumferential surface manufacturing method of the tone wheel for a speed sensor, characterized in that it comprises a process of making a cylindrical tone wheel (240). 청구항 3에 있어서,The method according to claim 3, 사출을 통하여 상기 원통(232)을 만드는 과정을 포함하는 것을 특징으로 하는 스피드 센서용 톤휠의 제작방법.Method of manufacturing a wheel for a speed sensor, characterized in that it comprises a process of making the cylinder 232 through the injection. 청구항 3 또는 청구항 4에 있어서,The method according to claim 3 or 4, 상기 원통톤휠(240)을 복수개의 톤휠(200)로 절단하는 과정을 포함하는 것을 특징으로 하는 스피드 센서용 톤휠의 제작방법.Method for producing a speed wheel tone wheel, comprising the step of cutting the cylindrical tone wheel 240 into a plurality of tone wheels (200).
KR1020080040669A 2008-04-30 2008-04-30 Tone Wheel For Speed Sensor And Manufacturing Method Thereof KR100980971B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980034265U (en) * 1996-12-10 1998-09-15 박병재 Tone wheel of electronic pickup type speed sensor
KR100622483B1 (en) * 2004-06-11 2006-09-19 기아자동차주식회사 A tone wheel for detecting turnning speed in automobile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980034265U (en) * 1996-12-10 1998-09-15 박병재 Tone wheel of electronic pickup type speed sensor
KR100622483B1 (en) * 2004-06-11 2006-09-19 기아자동차주식회사 A tone wheel for detecting turnning speed in automobile

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