KR20130092859A - Mdps worm wheel and manufacturing method - Google Patents

Mdps worm wheel and manufacturing method Download PDF

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Publication number
KR20130092859A
KR20130092859A KR1020120014423A KR20120014423A KR20130092859A KR 20130092859 A KR20130092859 A KR 20130092859A KR 1020120014423 A KR1020120014423 A KR 1020120014423A KR 20120014423 A KR20120014423 A KR 20120014423A KR 20130092859 A KR20130092859 A KR 20130092859A
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KR
South Korea
Prior art keywords
boss
mdps
plastic hub
worm wheel
gear
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KR1020120014423A
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Korean (ko)
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KR101346347B1 (en
Inventor
홍성종
박병선
김동민
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남양공업주식회사
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Priority to KR1020120014423A priority Critical patent/KR101346347B1/en
Priority to CN201280069193.5A priority patent/CN104093622A/en
Priority to PCT/KR2012/002195 priority patent/WO2013122282A1/en
Publication of KR20130092859A publication Critical patent/KR20130092859A/en
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Publication of KR101346347B1 publication Critical patent/KR101346347B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409—Electric motor acting on the steering column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467—Joining articles or parts of a single article
    • B29C45/14491—Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D15/00—Producing gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/04—Steering gears mechanical of worm type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • F16H2055/065—Moulded gears, e.g. inserts therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Gears, Cams (AREA)

Abstract

PURPOSE: A motor driven power steering (MDPS) worm wheel and a manufacturing method thereof are provided to prevent a gear unit, a plastic hub, and a steel boss from being slipped in a rotary direction or being separated in an axial direction and a radial direction. CONSTITUTION: An MDPS worm wheel (A) comprises a boss (100), a gear unit (200), and a plastic hub (300). The boss is manufactured by a hollow pipe-shaped steel material. The gear unit includes a plurality of inner protruding units and an extension unit (210) on the inner circumference. The extension unit is formed in order to increase contact areas with the plastic hub. The inner protruding unit is formed in order to control the axial direction separation and the radial direction separation of the plastic hub. The plastic hub is formed by injecting resins into between the boss and the gear unit.

Description

ＭＤＰＳ 웜휠 및 제조방법{ＭＤＰＳ worm wheel and manufacturing method}Mdps worm wheel and manufacturing method

본 발명은 MDPS 웜휠 및 제조방법에 관한 것이다.
The present invention relates to an MDPS worm wheel and a manufacturing method.

일반적으로 전동 조향장치인 MDPS(Motor Driven Power Steering)는 유압을 이용하지 않고, 모터동력으로 조향 파워를 어시스트(assist)하는 방식이다.In general, MDPS (Motor Driven Power Steering), which is an electric steering device, is a method of assisting steering power by motor power without using hydraulic pressure.

이를 위해, MDPS는 ECU 제어로 동력을 발생하는 모터와, 모터를 통해 회전하는 웜축(Worm-Shaft)과, 상기 웜축과 치합된 웜휠(Worm Wheel)을 구비함으로써, 웜휠(Worm Wheel)의 회전력으로 조타력을 어시스트(assist)한다. To this end, MDPS is equipped with a motor that generates power under ECU control, a worm shaft that rotates through the motor, and a worm wheel that is engaged with the worm shaft, thereby providing a rotational force of the worm wheel. Assists in steering power.

또한, 모터의 구동력을 전달하기 위해서 웜축과 웜휠을 이용하는데, 이러한 웜축과 웜휠을 금속 재질로 만들 경우에 서로 접촉되는 부위에서 소음 또는 진동이 발생하여 사용상 제한을 받아왔다.In addition, a worm shaft and a worm wheel are used to transmit the driving force of the motor. When the worm shaft and the worm wheel are made of a metal material, noise or vibration occurs in contact with each other.

이에 따라, 웜축은 강(鋼)과 같은 금속 재질로 만들어지고, 웜휠은 예컨대 강과 같은 금속으로 이루어진 보스에다 합성수지재(플라스틱 재질)로 형성되며 치형을 갖는 기어부를 일체로 성형하여 만들어진다.Accordingly, the worm shaft is made of a metal material such as steel, and the worm wheel is formed of a boss made of a metal such as steel and made of a synthetic resin material (plastic material), and is formed by integrally molding a gear having a tooth shape.

이와 같은 종래의 윔휠 제조방법으로는 압입 방식과 사출방식이 주로 이용되고, 이 중, 압입 방식은 소정 두께로 절단된 보스를 동일한 두께로 절단된 기어부의 중심에 압입하여 그 접합부를 고주파로 융착한다. 이후, 기어부의 외주면에 치형을 후 가공하여 윔힐의 제조가 완료된다.As a conventional method for manufacturing a wheel wheel, a press-fitting method and an injection method are mainly used. Among them, the press-fitting method presses a boss cut to a predetermined thickness into the center of a gear part cut to the same thickness and fuses the joint at high frequency. . Thereafter, the tooth is post-processed on the outer circumferential surface of the gear portion to complete the manufacture of the toehill.

그러나, 종래의 압입 방식은 그 제조 공정이 복잡하여 제조시간이 많이 소요되고 치형을 형성하기 위한 후 가공을 거쳐야 함에 따라 생산성이 저하되는 문제점이 있었다.However, the conventional indentation method has a problem in that the manufacturing process is complicated, so that a large amount of manufacturing time is required and a post processing is required to form a tooth, thereby decreasing productivity.

이러한 종래의 압입 방식의 문제점을 해결하기 위해 하기 [문헌 1]의 보스를 사출 금형 내에 위치시킨 후 수지 용융액을 사출 금형에 토출시켜 웜휠을 제조하는 '사출 성형을 이용한 조향장치의 감속기어용 웜휠 제조방법'이 제안되었다.In order to solve the problems of the conventional indentation method, the boss of [Document 1] is placed in an injection mold, and then a resin melt is discharged to the injection mold to manufacture a worm wheel. 'Was proposed.

그러나, 문헌 1의 사출 방식 또한 사출에 의해 형성된 기어부에 추가적인 치형을 후 가공하는 문제점이 있었다.However, the injection method of Document 1 also has a problem of post-processing additional teeth on the gear portion formed by injection.

또한, 이형 재질로 형성된 보스와 기어부로 이루어진 웜휠은 구동시에 보스와 기어부가 축 방향 및 경 방향 이탈 또는 회전방향으로 분리되어 슬립이 발생하는 문제점이 있었다. In addition, a worm wheel made of a boss and a gear part formed of a release material has a problem in that the boss and the gear part are separated in an axial direction and a radial deviation or a rotation direction during driving, thereby causing slip.

따라서, 보스와 기어부의 축 방향 및 경 방향 이탈 및 회전방향의 슬립을 방지하는 개선된 MDPS 웜휠의 개발이 요구되고 있는 실정이다.
Therefore, there is a need for the development of an improved MDPS worm wheel that prevents slipping in the axial and radial deviations and rotational directions of the boss and the gear portion.

[문헌 1] 한국공개특허 제2009-0016130호(2009.02.13)
[Document 1] Korean Patent Publication No. 2009-0016130 (2009.02.13)

본 발명은 전술한 종래의 제반 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 기어부와 플라스틱 허브 및 스틸 보스의 축 방향 및 경 방향 이탈 및 회전 방향의 슬립을 방지하는 MDPS 웜휠 및 제조방법을 제공하는 데 있다.The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is an MDPS worm wheel and a manufacturing method for preventing slipping in the axial and radial deviation and rotational direction of the gear portion, plastic hub and steel boss To provide.

또한, 본 발명의 다른 목적은 제조공정이 단순하고 생산성이 증대되는 MDPS 웜휠 및 제조방법을 제공하는 데 있다.
Another object of the present invention is to provide an MDPS worm wheel and a manufacturing method of which the manufacturing process is simple and productivity is increased.

상기와 같은 목적을 달성하기 위한 본 발명의 MDPS 웜휠은, 중공 파이프 형상의 스틸 소재로 형성된 보스; 치형이 형성된 기어부; 및 상기 보스와 기어부 사이로 수지를 사출하여 형성되는 플라스틱 허브;를 포함하되, 상기 기어부의 내주면에는 플라스틱 허브와의 접촉면적을 증가시키도록 연장부가 형성되며, 상기 플라스틱 허브를 정면에서 바라볼 때, 상기 상기 연장부와 연접하는 상기 기어부의 내주면에는 다수의 내향돌부가 돌출형성되어, 상기 플라스틱 허브(300)의 축 및 경방향 이탈을 규제 가능하게 구성되는 것을 특징으로 한다.MDPS worm wheel of the present invention for achieving the above object, the boss formed of a steel material of the hollow pipe shape; Toothed gear unit; And a plastic hub formed by injecting resin between the boss and the gear part, wherein the inner circumferential surface of the gear part is formed with an extension part to increase a contact area with the plastic hub, and when viewed from the front of the plastic hub, A plurality of inward protrusions protrude from the inner circumferential surface of the gear part which is in contact with the extension, characterized in that the plastic hub 300 is configured to regulate the axial and radial deviation.

본 발명의 MDPS 웜휠은, 중공 파이프 형상의 스틸 소재로 형성된 보스; 치형이 형성된 기어부; 및 상기 보스와 기어부 사이로 수지를 사출하여 형성되는 플라스틱 허브;를 포함하되, 상기 보스의 양측 단부에는 측 단면에서 볼 때 직선형으로 함몰 또는 경사형으로 일부 은닉되는 홈 측면을 갖는 결합홈이 오목형성되어, 보스의 축 및 경방향 이탈을 규제 가능하게 구성되는 것을 특징으로 한다.MDPS worm wheel of the present invention, the boss formed of a steel material of the hollow pipe shape; Toothed gear unit; And a plastic hub formed by injecting resin between the boss and the gear part, wherein both sides of the boss have a recessed groove having a groove side portion partially hidden in a straight line recessed or inclined when viewed from a side cross section. It is characterized in that the configuration of the boss axis and radial deviation can be regulated.

또한, 상기 보스의 결함홈은, 측 단면에서 바라볼 때, 내외향 중 어느 하나 이상의 방향으로 경사지게 형성되는 것을 특징으로 한다.In addition, the defect groove of the boss, when viewed from the side cross-section, characterized in that formed inclined in any one or more directions of inward and outward.

또한, 상기 기어부의 내주면에는 플라스틱 허브와의 접촉면적을 증가시키도록 연장부가 형성되며, 상기 연장부의 양 측면 둘레를 따라 걸림홈이 복수개 형성된 것을 특징으로 한다.In addition, the inner peripheral surface of the gear portion is formed with an extension to increase the contact area with the plastic hub, characterized in that a plurality of engaging grooves are formed along the circumference of both sides of the extension.

또한, 상기 보스의 외주면 둘레를 따라 회전방지 외향돌부를 복수개 형성되는 것을 특징으로 한다.
In addition, a plurality of anti-rotation outward protrusions are formed along the outer circumference of the boss.

본 발명의 MDPS 웜휠 제조방법은, 중공 파이프 형상의 스틸 소재로 형성되는 보스를 준비하여, 상기 보스와 외주면에 치형이 형성되는 기어부의 사이에 개재되는 플라스틱 허브를 일체로 사출 성형하는 단계를 포함하고, 상기 보스의 양측 단부에는 측 단면에서 볼 때 일부 은닉되는 홈 측면을 갖는 결합홈을 오목형성하여, 보스의 축 및 경방향 이탈을 규제 가능하게 하는 것을 특징으로 한다.
MDPS worm wheel manufacturing method of the present invention comprises the steps of preparing a boss formed of a steel material of the hollow pipe shape, integrally injection molding the plastic hub interposed between the boss and the gear portion is formed on the outer peripheral surface; In both ends of the boss, it is concave to form a coupling groove having a groove side is partially hidden when viewed from the side cross-section, it characterized in that the axial and radial deviation of the boss can be regulated.

본 발명에 따른 MDPS 웜휠 및 제조방법에 따르면, 보스에 형성되는 회전방지돌기와 한 쌍의 결합홈과, 기어부에 형성되는 연장부와 상기 연장부에 형성되는 걸림홈에 의해 기어부와 플라스틱 허브 및 플라스틱 허브와 보스의 축 방향 및 경 방향 이탈 및 회전 방향의 슬립을 방지하는 효과가 있다.According to the MDPS worm wheel and the manufacturing method according to the present invention, the gear portion and the plastic hub by the anti-rotation protrusion formed in the boss and a pair of coupling groove, the extension portion formed in the gear portion and the engaging groove formed in the extension portion; The plastic hub and the boss have an effect of preventing the slip in the axial and radial direction deviation and rotational direction.

즉, 외측에서 가하여지는 축 방향의 힘 및 회전 방향의 힘을 유효하게 견딘다.That is, it effectively withstands the force in the axial direction and the force in the rotational direction applied from the outside.

또한, 치형사출공법에 의해 치형이 형성된 기어부와 보스 사이로 수지를 사출하여 플라스틱 허브를 형성함에 따라 종래와 달리 치형 후 가공 공정을 삭제함에 따라 공정수가 감소하여 제조공정이 단순하고 생산성이 증대된다.
In addition, by injecting the resin between the gear and the boss formed by the tooth injection method to form a plastic hub, the number of steps is reduced by eliminating the post-tooth teeth machining process, unlike the conventional method, the manufacturing process is simple and productivity is increased.

도 1은 본 발명에 따른 MDPS 웜휠을 도시한 사시도이다.
도 2는 도 1의 측단면도이다.
도 3은 도 1의 보스를 도시한 정면도이다.
도 4는 도 3의 측단면도이다.
도 5는 도 3의 다른 실시예에 따른 측단면도로서, 복수의 변형례를 함께 도시한 도면이다.
도 6은 도 1의 기어부를 도시한 정면도이다.
도 7은 도 6의 측단면도이다.
도 8은 도 6의 다른 실시예에 따른 측단면도이다.
도 9는 도 6의 또 다른 실시예에 따른 측단면도이다.
도 10은 본 발명의 제1 핵심 실시예에 따른 MDPS 웜휠을 도시한 사시도 및 그의 측단면도, 그리고 정면도이다.
도 11은 제2 핵심 실시예에 따른 MDPS 웜휠을 도시한 사시도 및 그의 측단면도, 그리고 정면도이다
도 12는 도 6에 대응하는 도 10 및 도 11에서의 실시예에 따른 측단면도이다.1 is a perspective view showing an MDPS worm wheel according to the present invention.
2 is a side cross-sectional view of FIG. 1.
3 is a front view illustrating the boss of FIG. 1.
Fig. 4 is a side sectional view of Fig. 3; Fig.
FIG. 5 is a side cross-sectional view according to another exemplary embodiment of FIG. 3, illustrating a plurality of modified examples.
6 is a front view illustrating the gear unit of FIG. 1.
7 is a side sectional view of Fig.
8 is a side cross-sectional view according to another embodiment of FIG. 6.
9 is a side cross-sectional view according to another embodiment of FIG. 6.
10 is a perspective view, a side cross-sectional view, and a front view of an MDPS worm wheel according to a first core embodiment of the present invention.
11 is a perspective view, a side cross-sectional view, and a front view of an MDPS worm wheel according to a second core embodiment;
12 is a side cross-sectional view according to the embodiment in FIGS. 10 and 11 corresponding to FIG. 6.

이하, 본 발명의 바람직한 실시 예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 MDPS 웜휠을 도시한 사시도이고, 도 2는 도 1의 측단면도이며, 도 3은 도 1의 보스를 도시한 정면도이고, 도 4는 도 3의 측단면도이며, 도 5는 도 3의 다른 실시예에 따른 측단면도로서, 복수의 변형례를 함께 도시한 도면이며, 도 6은 도 1의 기어부를 도시한 정면도이고, 도 7은 도 6의 측단면도이며, 도 8은 도 6의 다른 실시예에 따른 측단면도이며, 도 9는 도 6의 또 다른 실시예에 따른 측단면도이다.1 is a perspective view showing an MDPS worm wheel according to the invention, Figure 2 is a side cross-sectional view of Figure 1, Figure 3 is a front view showing the boss of Figure 1, Figure 4 is a side cross-sectional view of Figure 3, Figure 5 3 is a side cross-sectional view according to another embodiment of FIG. 3, illustrating a plurality of modification examples, FIG. 6 is a front view illustrating the gear unit of FIG. 1, FIG. 7 is a side cross-sectional view of FIG. 6, and FIG. 8 is 6 is a side cross-sectional view according to another embodiment of FIG. 6, and FIG. 9 is a side cross-sectional view according to another embodiment of FIG. 6.

한편, 도 10은 본 발명의 제1 핵심 실시예에 따른 MDPS 웜휠을 도시한 사시도 및 그의 측단면도, 그리고 정면도이고, 도 11은 제2 핵심 실시예에 따른 MDPS 웜휠을 도시한 사시도 및 그의 측단면도, 그리고 정면도이며, 도 12는 도 6에 대응하는 도 10 및 도 11에서의 실시예에 따른 측단면도이다.On the other hand, Figure 10 is a perspective view and a side cross-sectional view, and a front view showing an MDPS worm wheel according to the first core embodiment of the present invention, Figure 11 is a perspective view and a side cross-sectional view showing an MDPS worm wheel according to a second core embodiment And FIG. 12 is a side cross-sectional view according to the embodiment in FIGS. 10 and 11 corresponding to FIG. 6.

도 1 내지 도 12에 도시한 바와 같이, 본 발명에 따른 MDPS 웜휠(A)은, 중공 파이프 형상의 스틸 소재로 형성된 보스(100)와, 치형(201)이 형성된 기어부(200) 및 상기 보스(100)와 기어부(200) 사이로 수지를 사출하여 형성되는 플라스틱 허브(300)로 구성된다.As shown in Figures 1 to 12, MDPS worm wheel (A) according to the present invention, the boss 100 formed of a hollow pipe-shaped steel material, the gear portion 200 is formed with a tooth 201 and the boss It consists of a plastic hub 300 formed by injecting resin between the 100 and the gear portion 200.

또, 본 발명의 핵심 실시예로서의 도 10에 예시된 바와 같이, 상기 기어부(200)의 내주면에는 플라스틱 허브(300)와의 접촉면적을 증가시키도록 연장부(210)가 형성되며, 상기 플라스틱 허브(300)을 정면에서 바라볼 때, 상기 상기 연장부(210)와 연접하는 상기 기어부(200)의 내주면에는 다수의 내향돌부(223)가 방사상으로 내향돌출 형성되어, 상기 플라스틱 허브(300)의 축 및 경방향 이탈을 규제 가능하게 구성되어 있다.In addition, as illustrated in FIG. 10 as a core embodiment of the present invention, an extension portion 210 is formed on an inner circumferential surface of the gear part 200 to increase a contact area with the plastic hub 300. When looking at 300 from the front, a plurality of inward projections 223 are radially inwardly formed on the inner circumferential surface of the gear portion 200 in contact with the extension portion 210, the plastic hub 300 of the Axial and radial deviation can be regulated.

또, 상기 기어부(200)는 도 10에 예시된 바와 같이, 기어부(201)의 연장부(210) 내주면에 오목구(211)가 걸림구의 기능을 수행하도록 구성되어 있다.In addition, as illustrated in FIG. 10, the gear part 200 is configured such that the recessed hole 211 is provided on the inner circumferential surface of the extension part 210 of the gear part 201 to perform the function of the locking hole.

또한, 도 11 내지 도 12에 예시된 바와 같이, 상기 기어부(201)의 연장부(210)에는 사출 시, 상기 플라스틱 허브(300) 과의 결합력을 배가하도록, 상기 플라스틱 허브(300)가 일부 함입되는 함입구(213)가 다수개 방사상으로 배열되어 있다.In addition, as illustrated in FIGS. 11 to 12, the extension portion 210 of the gear portion 201 may partially include the plastic hub 300 so as to double the bonding force with the plastic hub 300 during injection. A plurality of recesses 213 to be recessed are arranged radially.

물론, 기어부(201)의 연장부(210) 내주면에 오목구(211)가 일체로 형성됨은 물론이다.Of course, the recess 211 is integrally formed on the inner circumferential surface of the extension part 210 of the gear part 201.

그리고, 상기 함입구(213)은 상기 연장부(210) 양측면을 관통해도 좋으며, 중앙이 폐쇄되어 양측 일부만 오목 형성되는 구조로 해도 유사한 작용효과를 나타낸다.In addition, the inlet 213 may penetrate both sides of the extension part 210, and a similar effect may be obtained even when the center is closed and only a part of both sides is concave.

한편, 상기 내향돌부(223)는 상기 웜휠의 정면 상에서 볼 때, 더브테일 홈 형상으로 형성되어, 피연결체 간의 팽창을 방지하거나, 흡습 작용에 영향이 미치지 않도록 함으로써, 보다 견고한 결합이 되도록 구성된다.On the other hand, the inward protrusion 223 is formed in the shape of a dovetail groove when viewed from the front of the worm wheel, it is configured to prevent a swelling between the connected objects, or to prevent the influence of the hygroscopic action, it is configured to be a stronger bond. .

또한, 도 2 내지 도 3에 예시된 바와 같이, 상기 보스(100)의 외주면 둘레에는 회전방지 외향돌부(110)가 복수개 등 간격으로 형성되며, 상기 보스(100)의 양측 단부에는 측 단면에서 볼 때 홈 측벽면이 일부 은닉되어 보이는 둥근 테 형상의 결합홈(120)이 오목형성된다.In addition, as illustrated in FIGS. 2 to 3, around the outer circumferential surface of the boss 100, a plurality of anti-rotation outward protrusions 110 are formed at equal intervals, and both ends of the boss 100 are viewed from side cross sections. When the groove side wall surface is partially concealed, the round te-shaped coupling groove 120 is formed.

즉, 상기 회전방지 외향돌부(110)에 의해 상기 보스(100)와 플라스틱 허브(300)는 서로 간의 접촉면적을 증가시켜 회전 방향의 슬립을 방지하여 견고하게 고정하게 된다.That is, the boss 100 and the plastic hub 300 by the anti-rotation outward protrusion 110 increases the contact area between each other to prevent the slip in the rotation direction to be firmly fixed.

더욱이, 상기 결합홈(120)과 회전방지 외향돌부(110)에 의해 상기 보스(100)와 플라스틱 허브(300)의 축 방향 및 경 방향 이탈이 방지된다.In addition, the axial and radial deviation of the boss 100 and the plastic hub 300 is prevented by the coupling groove 120 and the anti-rotation outward protrusion 110.

그리고, 상기 보스(100)를 도 5와 같이 측 단면에서 바라볼 때, 상기 결합홈(120)은 보스의 축방향으로 경사지게 형성된다. 즉, 축 방향으로 하향 경사진 결합홈(120)과 플라스틱 허브(300)가 결합하여 축 방향 및 경 방향 하중을 견디는 구조적 특성을 가지게 된다.And, when looking at the boss 100 from the side cross section as shown in Figure 5, the coupling groove 120 is formed to be inclined in the axial direction of the boss. That is, the coupling groove 120 and the plastic hub 300 inclined downward in the axial direction is coupled to have a structural characteristic to withstand axial and radial loads.

한편, 상기 보스(100)를 도 4와 같이 측 단면에서 바라볼 때, 상기 회전방지 외향돌부(110)의 폭(a)은 보스의 폭(b)보다 상대적으로 작게 형성되어 축 방향 하중을 지지하도록 형성된다. 이는, 상대적으로 폭이 작은 회전방지 외향돌부(110)의 측면을 플라스틱 허브(300)가 덮기 때문이다.On the other hand, when looking at the boss 100 from the side cross section as shown in Figure 4, the width (a) of the anti-rotation outward protrusion 110 is formed relatively smaller than the width (b) of the boss to support the axial load It is formed to. This is because the plastic hub 300 covers the side surface of the anti-rotation outward protrusion 110 having a relatively small width.

또한, 상기 기어부(200)의 내주면에는 플라스틱 허브(300)와의 접촉면적을 증가시키도록 축 방향으로 돌출된 연장부(210)가 형성되며, 상기 연장부(210)의 양 측면 둘레를 따라 걸림홈(220)이 복수개 형성된다.In addition, an extension portion 210 protruding in the axial direction is formed on the inner circumferential surface of the gear portion 200 to increase the contact area with the plastic hub 300, and is caught along both side circumferences of the extension portion 210. A plurality of grooves 220 are formed.

즉, 상기 연장부(210)에 의해 상기 기어부(200)와 플라스틱 허브(300)의 축 방향 이탈이 방지된다.That is, the axial departure of the gear part 200 and the plastic hub 300 is prevented by the extension part 210.

더욱이, 상기 걸림홈(220)과 연장부(210)에 의해 상기 기어부(200)와 플라스틱 허브(300)의 접촉면적을 증가시켜 회전 방향의 슬립을 방지하여 견고하게 고정하게 된다.In addition, the locking groove 220 and the extension part 210 increase the contact area between the gear part 200 and the plastic hub 300 to prevent the slip in the rotational direction to be firmly fixed.

그리고, 상기 걸림홈(220)은 도 7과 같이 축 방향으로 경사지게 형성되어 플라스틱 허브(300)와의 접촉면적을 늘려주게 된다. 이러한 경사 형성은 사출성형 후의 외형 유지를 용이하게 하는 부가 효과도 있음은 물론이다.In addition, the locking groove 220 is formed to be inclined in the axial direction as shown in FIG. 7 to increase the contact area with the plastic hub 300. Of course, the inclined formation also has the added effect of facilitating the appearance retention after injection molding.

한편, 상기 외향돌부(110)는 상기 웜휠의 측단면 상에서 볼 때, 더브테일 홈 형상으로 형성되어, 피연결체 간의 팽창을 방지하거나, 흡습 작용에 영향이 미치지 않도록 함으로써, 보다 견고한 결합이 되도록 구성된다.
On the other hand, the outward protrusion 110 is formed in the shape of a dovetail groove when viewed from the side cross-section of the worm wheel, to prevent expansion between the connected objects, or to prevent the influence on the hygroscopic action, it is configured to be a more rigid coupling do.

한편, 상기 기어부(200)를 도 8과 같이 측 단면에서 바라볼 때, 상기 연장부(210)는 내주면 가장자리(c)부터 기어부(200) 내주면(d)까지 폭이 줄어들도록 형성되어 플라스틱 허브(300)와 접촉면적을 늘려줌과 동시에 기어부가 경 방향 이탈되지 않도록 결합력을 증대시켜 주는 걸림구의 기능을 수행하도록 형성되어 있다.On the other hand, when looking at the gear portion 200 from the side cross-section as shown in Figure 8, the extension portion 210 is formed so as to reduce the width from the inner peripheral surface edge (c) to the gear peripheral portion (200) inner peripheral surface (d) It is formed to increase the contact area with the hub 300 and at the same time perform the function of the locking mechanism to increase the coupling force so that the gear portion does not deviate in the radial direction.

또한, 상기 기어부(200)는 치형사출공법에 의해 치형(201) 및 그 전체적인 외형이 형성된다.In addition, the gear part 200 has a tooth 201 and its overall shape is formed by a tooth injection method.

또, 상기 기어부(200)은 도 9에 예시된 바와 같이, 기어부(201)의 내주면에 오목구(211)이 걸림구의 기능을 수행하도록 구성되어도 좋다. 그리고, 이러한 걸림구의 기능은, 기어부(200)의 연장부(210) 측벽에 다수개 간헐적으로 돌출형성된 돌기부(221) 또는 그 내벽의 톱니부(223)를 이용해도 동일한 걸림구의 기능을 수행하도록 구성되어 있다.In addition, as illustrated in FIG. 9, the gear part 200 may be configured such that a recess 211 is provided on the inner circumferential surface of the gear part 201 to function as a locking hole. And, the function of such a locking mechanism, even if using a plurality of intermittent protrusions 221 formed on the side wall of the extension portion 210 of the gear portion 200 or the teeth 223 of the inner wall to perform the same function of the locking mechanism. Consists of.

즉, 본 발명에 따르면, 상기 보스(100)에 형성되는 회전방지 외향돌부(110)와 한 쌍의 결합홈(120)과, 상기 기어부(200)에 형성되는 연장부(210)와 상기 연장부(210)에 형성되는 걸림홈(220)에 의해 상기 기어부(200)와 플라스틱 허브(300) 및 상기 플라스틱 허브(300)와 보스(100)의 축 방향 및 경 방향 이탈 및 회전 방향의 슬립을 방지하게 된다. 물론, 상기 돌기부(221) 및 톱니부(223)에 의해 상기 기어부(200)와 플라스틱 허브(300) 및 상기 플라스틱 허브(300)와 보스(100)의 축 방향 및 경 방향 이탈 및 회전 방향의 슬립이 방지됨은 물론이다. (도 9 참조)That is, according to the present invention, the anti-rotation outward protrusion 110 and the pair of coupling grooves 120 formed in the boss 100, the extension portion 210 and the extension formed in the gear unit 200 Slip in the axial and radial deviation and rotational direction of the gear unit 200 and the plastic hub 300 and the plastic hub 300 and the boss 100 by the engaging groove 220 formed in the portion 210 Will be prevented. Of course, the protrusions 221 and the teeth 223 of the gear portion 200 and the plastic hub 300 and the plastic hub 300 and the boss 100 of the axial direction and radial direction deviation and rotational direction of Of course, slip is prevented. (See Fig. 9)

즉, 본 발명의 웜휠(A)의 외측에서 가하여지는 축 방향의 힘 및 회전 방향의 힘을 유효하게 견딘다.That is, it effectively withstands the force in the axial direction and the force in the rotational direction applied from the outside of the worm wheel A of the present invention.

또한, 치형사출공법에 의해 치형(201)이 형성된 기어부(200)와 보스(100)의 사이로 수지를 사출하여 플라스틱 허브(200)를 형성함에 따라 종래와 달리 치형 후 가공 공정을 삭제함에 따라 공정수가 감소하여 제조공정이 단순하고 생산성이 증대된다.
In addition, by injecting the resin between the gear portion 200 and the boss 100 formed with the teeth 201 by the tooth injection method to form a plastic hub 200, unlike the conventional process by removing the post-teeth machining process The number is reduced, the manufacturing process is simple and productivity is increased.

이하, 본 발명에 따른 MDPS 웜휠의 제조방법을 설명한다.Hereinafter, the manufacturing method of the MDPS worm wheel according to the present invention.

먼저, 중공 파이프 형상의 스틸 소재로 형성되는 보스(100)를 준비한다.First, a boss 100 formed of a hollow pipe-shaped steel material is prepared.

이때, 상기 보스(100)의 외주면 둘레를 따라 회전방지 외향돌부(110)를 복수개 형성하고, 상기 보스(100)의 양측 단부에는 둥근 테 형상의 결합홈(120)을 오목형성한다.In this case, a plurality of anti-rotation outward protrusions 110 are formed along the outer circumferential surface of the boss 100, and concave recesses 120 are formed at both ends of the boss 100.

더욱이, 상기 보스(100)를 측 단면에서 바라볼 때, 상기 결합홈(120)은 보스의 축 방향으로 경사지게 형성시킬 수도 있으며, 보스의 내외향 중 어느 하나 이상의 방향으로 경사지게 형성시켜도 좋다.Further, when looking at the boss 100 from the side cross section, the coupling groove 120 may be formed to be inclined in the axial direction of the boss, may be formed to be inclined in any one or more of the direction of the boss.

이에 더해, 상기 보스(100)를 측 단면에서 바라볼 때, 상기 회전방지 외향돌부(110)의 폭은 보스(100)의 폭보다 상대적으로 작게 형성한다.In addition, when the boss 100 is viewed from the side cross section, the width of the anti-rotation outward protrusion 110 is formed to be relatively smaller than the width of the boss 100.

다음, 치형사출공법에 의해 치형(201)이 형성된 둥근 테(Rim) 형상의 기어부(200)를 준비한다. Next, a round rim-shaped gear unit 200 in which the teeth 201 are formed by the tooth injection method is prepared.

이때, 상기 기어부(200)의 내주면에는 플라스틱 허브(300)와 접촉면적을 증가시키도록 연장부(210)를 형성하며, 상기 연장부(210)의 양 측면 둘레를 따라 걸림홈(220)을 복수개 형성한다.At this time, the inner peripheral surface of the gear portion 200 is formed with an extension portion 210 to increase the contact area with the plastic hub 300, the engaging groove 220 along the circumference of both sides of the extension portion 210 A plurality is formed.

더욱이, 상기 걸림홈(220)은 축방향으로 경사지게 형성한다.Moreover, the locking groove 220 is formed to be inclined in the axial direction.

이에 더해, 상기 기어부(200)를 측 단면에서 바라볼 때, 상기 연장부(210)는 가장자리부터 기어부(200)의 내주면까지 폭이 줄어들도록 형성한다.In addition, when the gear portion 200 is viewed from the side cross section, the extension portion 210 is formed to decrease in width from the edge to the inner circumferential surface of the gear portion 200.

그리고, 상기 보스(100)와 기어부(200)의 사이에 수지를 사출하여 플라스틱 허브(300)를 형성하여 본 발명에 따른 MDPS 웜휠(A)의 제조를 완성한다.Then, the resin is injected between the boss 100 and the gear part 200 to form a plastic hub 300 to complete the manufacture of the MDPS worm wheel A according to the present invention.

한편, 전술한 설명에서 상기 보스(100)를 먼저 준비하고 이후 기어부(200)를 준비하는 것으로 기재되었지만, 이는 설명의 편의를 위해서 기재된 것으로 그 순서를 특별히 한정하는 것은 아니다.
Meanwhile, in the above description, the boss 100 is first prepared and then the gear unit 200 is described. However, this is described for convenience of description and the order is not particularly limited.

이상, 본 발명의 바람직한 실시 예에 대하여 상세히 설명하였으나, 본 발명의 기술적 범위는 전술한 실시 예에 한정되지 않고 특허청구범위에 의하여 해석되어야 할 것이다. 이때, 이 기술분야에서 통상의 지식을 습득한 자라면, 본 발명의 범위에서 벗어나지 않으면서도 많은 수정과 변형이 가능함을 고려해야 할 것이다.
Although the preferred embodiments of the present invention have been described in detail, the technical scope of the present invention is not limited to the above-described embodiments, but should be construed according to the claims. It will be understood by those skilled in the art that many modifications and variations are possible without departing from the scope of the present invention.

A - MDPS 웜휠 100 - 보스
110 - 회전방지 돌기 120 - 결합홈
200 - 기어부 201 - 치형
210 - 연장부 220 - 걸림홈
300 - 플라스틱 허브A-MDPS Worm Wheel 100-Boss
110-anti-rotation protrusion 120-coupling groove
200-Gear 201-Teeth
210-Extension 220-Hanging Groove
300-plastic hub

Claims (6)

중공 파이프 형상의 스틸 소재로 형성된 보스;
치형이 형성된 기어부; 및
상기 보스와 기어부 사이로 수지를 사출하여 형성되는 플라스틱 허브;를 포함하되,
상기 기어부의 내주면에는 플라스틱 허브와의 접촉면적을 증가시키도록 연장부가 형성되며, 상기 플라스틱 허브를 정면에서 바라볼 때, 상기 상기 연장부와 연접하는 상기 기어부의 내주면에는 다수의 내향돌부가 돌출형성되어, 상기 플라스틱 허브(300)의 축 및 경방향 이탈을 규제 가능하게 구성되는 것을 특징으로 하는 MDPS 웜휠.
A boss formed of a steel material of hollow pipe shape;
Toothed gear unit; And
Includes; plastic hub formed by injecting a resin between the boss and the gear portion;
An extension part is formed on the inner circumferential surface of the gear part to increase a contact area with the plastic hub, and when the plastic hub is viewed from the front, a plurality of inward protrusions are formed on the inner circumferential surface of the gear part which is in contact with the extension part. MDPS worm wheels, characterized in that configured to control the axial and radial deviation of the plastic hub (300).
중공 파이프 형상의 스틸 소재로 형성된 보스;
치형이 형성된 기어부; 및
상기 보스와 기어부 사이로 수지를 사출하여 형성되는 플라스틱 허브;를 포함하되,
상기 보스의 양측 단부에는 측 단면에서 볼 때 직선형으로 함몰 또는 경사형으로 일부 은닉되는 홈 측면을 갖는 결합홈이 오목형성되어, 보스의 축 및 경방향 이탈을 규제 가능하게 구성되는 것을 특징으로 하는 MDPS 웜휠.
A boss formed of a steel material of hollow pipe shape;
Toothed gear unit; And
Includes; plastic hub formed by injecting a resin between the boss and the gear portion;
MDPS, characterized in that the both ends of the boss is formed in the concave engaging groove having a groove side surface partially hidden in a straight depression or inclined when viewed in the side cross-section, to control the axial and radial deviation of the boss Worm wheel.
제 2항에 있어서,
상기 보스의 결함홈은, 측 단면에서 바라볼 때, 내외향 중 어느 하나 이상의 방향으로 경사지게 형성되는 것을 특징으로 하는 MDPS 웜휠.
The method of claim 2,
MDPS worm wheel, characterized in that the defect groove of the boss, when viewed from the side cross-section is inclined in any one or more directions of inward and outward.
제 1항 또는 제 2항에 있어서,
상기 기어부의 내주면에는 플라스틱 허브와의 접촉면적을 증가시키도록 연장부가 형성되며, 상기 연장부의 양 측면 둘레를 따라 걸림홈이 복수개 형성된 것을 특징으로 하는 MDPS 웜휠.
3. The method according to claim 1 or 2,
The inner peripheral surface of the gear portion is formed with an extension to increase the contact area with the plastic hub, MDPS worm wheel, characterized in that a plurality of engaging grooves are formed along the circumference of both sides of the extension.
제 2항에 있어서,
상기 보스의 외주면 둘레를 따라 회전방지 외향돌부를 복수개 형성되는 것을 특징으로 하는 MDPS 웜휠.
The method of claim 2,
MDPS worm wheel, characterized in that a plurality of anti-rotation outward protrusions are formed along the outer circumference of the boss.
중공 파이프 형상의 스틸 소재로 형성되는 보스를 준비하여, 상기 보스와 외주면에 치형이 형성되는 기어부의 사이에 개재되는 플라스틱 허브를 일체로 사출 성형하는 단계를 포함하고,
상기 보스의 양측 단부에는 측 단면에서 볼 때 일부 은닉되는 홈 측면을 갖는 결합홈을 오목형성하여, 보스의 축 및 경방향 이탈을 규제 가능하게 하는 것을 특징으로 하는 MDPS 웜휠 제조방법.
Preparing a boss formed of a hollow pipe-shaped steel material, and integrally injection molding the plastic hub interposed between the boss and a gear part having a tooth formed on an outer circumferential surface thereof,
MDPS worm wheel manufacturing method characterized in that at both ends of the boss to form a concave coupling groove having a groove side is partially hidden when viewed from the side cross-section, to control the axial and radial deviation of the boss.
KR1020120014423A 2012-02-13 2012-02-13 ＭＤＰＳ worm wheel and manufacturing method KR101346347B1 (en)

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