KR20090092446A - Variable friction system for steering lack of a car - Google Patents

Variable friction system for steering lack of a car

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Publication number
KR20090092446A
KR20090092446A KR1020080017691A KR20080017691A KR20090092446A KR 20090092446 A KR20090092446 A KR 20090092446A KR 1020080017691 A KR1020080017691 A KR 1020080017691A KR 20080017691 A KR20080017691 A KR 20080017691A KR 20090092446 A KR20090092446 A KR 20090092446A
Authority
KR
South Korea
Prior art keywords
rack
steering
steering wheel
support yoke
high friction
Prior art date
Application number
KR1020080017691A
Other languages
Korean (ko)
Other versions
KR100921071B1 (en
Inventor
우승훈
Original Assignee
현대자동차주식회사
기아자동차주식회사
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Application filed by 현대자동차주식회사, 기아자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020080017691A priority Critical patent/KR100921071B1/en
Publication of KR20090092446A publication Critical patent/KR20090092446A/en
Application granted granted Critical
Publication of KR100921071B1 publication Critical patent/KR100921071B1/en

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Classifications

    • 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
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/123—Steering gears mechanical of rack-and-pinion type characterised by pressure yokes
    • 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
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/22—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for rack-and-pinion 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
    • F16H55/26—Racks
    • F16H55/28—Special devices for taking up backlash
    • F16H55/283—Special devices for taking up backlash using pressure yokes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Steering Mechanism (AREA)

Abstract

A frictional force adjusting device for a steering rack of a vehicle is provided to reduce the steering pedal effort of a steering wheel by reducing frictional force when the steering wheel is positioned expect a neutral section to perform the left and right movement of the rack smoothly. A frictional force adjusting device for a steering rack of a vehicle comprises a gear-box(1), a rack(2), and a rack support yoke(11) and a high friction part(C). The rack is built in the gear-box. The rack engages with the pinion gear connected to a steering shaft. The rack is inserted from the outside of the gear-box. The rack support yoke is supported on the yoke spring and supports the back side of a gear forming part of the rack. The rack support yoke comprises a bushing installed at the contact surface with the rack. The high friction part is formed on a part of the rack contacted with the rack support yoke when the steering wheel is in neutral position. The high friction part comprises a separate friction member(15) having the frictional coefficient which is greater than the rack surface.

Description

자동차의 스티어링 랙 마찰력 가변장치{variable friction system for steering lack of a car}Variable friction system for steering lack of a car}

본 발명은 자동차의 스티어링 기어박스에 관한 것으로, 특히 조향 정도에 따라 랙에 작용하는 마찰력의 크기가 적절히 가변됨으로써 직진주행시의 스티어링휠 조작 안정성 및 선회주행시의 조작 편의성을 동시에 향상시킬 수 있도록 된 자동차의 스티어링 랙 마찰력 가변장치에 관한 것이다.The present invention relates to a steering gear box of a vehicle, and in particular, the amount of friction force acting on the rack according to the degree of steering is appropriately changed to improve the steering wheel operation stability when driving straight and the operation convenience when turning driving at the same time A steering rack friction force variable device.

근래 자동차의 스티어링 시스템은 유압에 의해 보타력이 발생하도록 된 유압식 파워 스티어링 시스템이 주를 이루고 있다.In recent years, the steering system of automobiles is mainly composed of hydraulic power steering system in which steering force is generated by hydraulic pressure.

상기 유압식 파워 스티어링 시스템은 도 1과 도 2에 도시된 바와 같이, 파워실린더 역할을 하는 기어박스(1)의 내부에 랙(2)이 내장되고, 상기 랙(2)의 양단에 타이로드(3)가 연결되며, 상기 랙(2)에 스티어링샤프트(4)의 단부에 설치된 피니언기어(5)가 치합되는 한편, 상기 랙(2)에 설치된 피스톤(2a)에 의해 기어박스(1)의 내부 공간이 2분할되고, 그 각 분할 공간에 연결관(6)들을 매개로 오일펌프(7) 및 오일리저버(8)가 연결되어 있다.As shown in FIGS. 1 and 2, the hydraulic power steering system has a rack 2 built into the gearbox 1 serving as a power cylinder, and tie rods 3 at both ends of the rack 2. ) Is connected to the rack (2) and the pinion gear (5) installed at the end of the steering shaft (4) is engaged, while the inside of the gearbox (1) by the piston (2a) installed in the rack (2) The space is divided into two, and the oil pump 7 and the oil reservoir 8 are connected to the respective divided spaces via the connecting pipes 6.

따라서, 스티어링휠(9) 조작에 따라 상기 피니언기어(5) 상부의 로터리밸브(10)에 의해 유로가 전환되면서 기어박스(1)내 일측 공간에 오일이 공급됨과 동시에 타측 공간의 오일이 리턴됨으로써 스티어링휠(9) 조작 방향으로 보타력이 발생하도록 되어 있었다.Accordingly, as the flow path is switched by the rotary valve 10 above the pinion gear 5 as the steering wheel 9 is operated, oil is supplied to one space in the gearbox 1 and oil in the other space is returned. The steering force was generated in the steering wheel 9 operation direction.

또한, 상기 랙(2)의 기어 형성부 후면은 기어박스(1)의 외부로부터 삽입된 랙서포트요크(11)에 의해 지지되어 상기 랙(2)과 피니언기어(5)의 치합 상태가 안정적으로 유지되도록 되어 있다.In addition, the rear of the gear forming portion of the rack (2) is supported by the rack support yoke (11) inserted from the outside of the gear box (1) so that the engagement state of the rack (2) and the pinion gear (5) stably It is supposed to be maintained.

상기 랙서포트요크(11)는 요크스프링(12)에 의해 지지되고, 요크스프링(12)은 요크플러그(13)에 의해 지지되며, 이들의 고정은 록너트(14)에 의해 이루어진다.The rack support yoke 11 is supported by the yoke spring 12, the yoke spring 12 is supported by the yoke plug 13, and the fixing thereof is made by the lock nut 14.

또한, 상기 랙서포트요크(11)의 앞쪽 단부에는 랙(2)과의 마찰에 의한 마모 방지를 위해 원주면 형상의 부싱(11a)이 구비되어 있다.In addition, the front end of the rack support yoke (11) is provided with a bushing (11a) of the circumferential surface in order to prevent abrasion by friction with the rack (2).

한편, 상기와 같은 구성의 스티어링 시스템에 있어서, 시미(shimmy), 킥백(kick back), 토크스티어(torque steer), 쏠림 등의 스티어링휠 특성과, 또한 스티어링휠(9)의 조작 성능 즉, 조향 답력과 선회 후 복원 성능은 상기 랙서포트요크(11)와 랙(2)의 마찰력에 크게 영향 받게 된다.(여기서, 상기 시미는 노면으로부터의 진동이 랙(2)을 좌우방향(화살표 A)으로 가진하여 스티어링휠(9)이 원주방향(화살표 B)으로 진동하는 것이고, 상기 킥백은 시미와 동일한 방향으로 충격이 전달되는 것이며, 상기 토크스티어는 양쪽 휠의 구동력 차이로 인해 차량 가속시 차량이 한쪽으로 조향되는 것이고, 상기 쏠림은 그 외 다양한 원인에 의해 차량이 주행 중 일측 방향으로 조향되는 것이다.)On the other hand, in the steering system of the above configuration, the steering wheel characteristics such as shimmy, kick back, torque steer, pull, and the steering performance of the steering wheel 9, that is, steering The stepping force and the recovery performance after turning are greatly influenced by the frictional force between the rack support yoke 11 and the rack 2. (In this case, the vibration from the road surface causes the rack 2 to move left and right (arrow A). Excitation of the steering wheel 9 vibrates in the circumferential direction (arrow B), the kickback is a shock is transmitted in the same direction as the shimi, and the torque steering is one side of the vehicle during the acceleration of the vehicle due to the difference in driving force between the two wheels Steering is to be steered in one direction while driving the vehicle for a variety of other reasons.)

한편, 상기 시미와 킥백, 토크스티어 및 쏠림 현상을 개선하기 위해서는 상기 마찰력이 큰 것이 유리하고, 이에 반해 스티어링휠의 조향 답력을 감소시키고 선회 후 복원성을 향상시키기 위해서는 상기 마찰력이 작은 것이 유리하다.On the other hand, the friction force is advantageous in order to improve the shimmy, kickback, torque steering, and pull phenomenon, while the friction force is advantageous in order to reduce steering effort of the steering wheel and improve resilience after turning.

따라서, 상기 랙서포트요크(11)와 랙(2) 사이의 마찰력을 조절하기 위해서 상기 요크스프링(12)의 스프링력을 조절할 수 있는데, 이 경우 스프링력을 감소시키면 랙(2)에 작용하는 마찰력이 감소하여 랙(2)의 이동 저항이 감소하므로 시미, 킥백, 토크스티어, 쏠림 현상이 악화되고, 반대로 스프링력을 증대시키면 랙(2)에 작용하는 마찰력이 증가하여 랙(2)의 이동이 억제됨으로써 스티어링휠의 복원성과 조향 답력이 악화되는 상반되는 특성이 나타나므로 최적의 마찰 조건을 형성하기가 매우 곤란하다는 문제점이 있었다.Therefore, the spring force of the yoke spring 12 can be adjusted to adjust the friction force between the rack support yoke 11 and the rack 2, in which case reducing the spring force causes friction force acting on the rack 2. This decreases the movement resistance of the rack (2), so that the taste, kickback, torque steer, pull phenomenon is worsened, on the contrary, if the spring force is increased, the friction force acting on the rack (2) is increased and the movement of the rack (2) is increased. By suppressing the opposite characteristics of deterioration of the steering wheel's stability and steering effort appeared, there was a problem that it is very difficult to form the optimum friction conditions.

이에 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 시미, 킥백, 토크스티어, 쏠림 현상 또한 스티어링휠의 선회 후 복원성과 조향 답력 등 서로 상반되는 조건에서 최적화되는 특성들을 간단한 구성으로써 모두 개선하여 스티어링휠의 조작 안정성과 편의성을 동시에 향상시킬 수 있도록 된 자동차의 스티어링 랙 마찰력 가변장치를 제공함에 그 목적이 있다.Accordingly, the present invention was devised to solve the above problems, and the simi, kickback, torquesteer, and pulling phenomenon are also improved by a simple configuration of characteristics optimized in mutually opposite conditions such as stability and steering power after turning of the steering wheel. The purpose of the present invention is to provide a steering rack friction force variable device of a vehicle that can improve the steering stability and convenience at the same time.

상기와 같은 목적을 달성하기 위한 본 발명은, The present invention for achieving the above object,

기어박스와,With the gearbox,

상기 기어박스에 내장되고 스티어링샤프트에 연동되는 피니언기어에 치합된 랙과,A rack fitted to the pinion gear built in the gearbox and interlocked to the steering shaft;

상기 기어박스의 외부로부터 삽입되고 요크스프링에 지지되어 상기 랙의 기어 형성부 후면을 지지하고 랙과의 접촉면에 부싱을 구비한 랙서포트요크 및,A rack support yoke inserted from the outside of the gear box and supported by the yoke spring to support the rear of the gear forming part of the rack and having a bushing on a contact surface with the rack;

상기 스티어링휠이 중립위치에 있을 때 상기 랙서포트요크에 맞닿는 랙의 부분에 형성된 고마찰부High friction portion formed in the portion of the rack that abuts the rack support yoke when the steering wheel is in the neutral position

를 포함하여 이루어진다.It is made, including.

상기 고마찰부는 스티어링휠이 중립 위치에 있을 때 상기 랙서포트요크가 맞닿는 부분을 중심으로 그 좌우 양측으로 차량의 차선변경시 행해지는 스티어링휠 조작에 의한 상기 랙의 좌우 이동거리만큼 형성된다.The high friction portion is formed by a left and right movement distance of the rack by steering wheel manipulation performed when the lane of the vehicle is changed to both left and right sides of the rack support yoke when the steering wheel is in a neutral position.

상기 고마찰부는 랙의 표면보다 마찰계수가 큰 것을 특징으로 한다.The high friction portion is characterized in that the friction coefficient is greater than the surface of the rack.

한편, 상기 고마찰부는 상기 랙에 안착홈이 형성되고, 그 안착홈에 마찰부재가 접착되어 형성될 수 있다.On the other hand, the high friction portion may be formed in the mounting groove is formed in the rack, the friction member is bonded to the mounting groove.

또한, 상기 고마찰부는 상기 랙의 표면가공을 통하여 형성될 수 있다.In addition, the high friction portion may be formed through the surface processing of the rack.

이상 설명한 바와 같은 구성으로 이루어진 본 발명에 따르면, 스티어링휠이 중립구간에 있을 때 랙과 랙서포트요크 사이의 마찰력이 크게 작용하므로 랙의 좌우 이동이 억제되어 시미, 킥백, 토크스티어, 쏠림 현상이 개선됨으로써 미소 조타 구간에서의 스티어링휠 조작 안정성이 향상된다.According to the present invention having the above-described configuration, since the friction force between the rack and the rack support yoke acts greatly when the steering wheel is in the neutral section, the left and right movements of the rack are suppressed, thereby improving the taste, kickback, torque steering, and pulling phenomenon. This improves the steering wheel operation stability in the micro steering section.

또한, 스티어링휠이 중립구간 이외의 구간에 있을 때 상기 마찰력이 감소되어 랙의 좌우 이동이 상대적으로 원활히 이루어짐으로써 스티어링휠의 조향 답력이 감소하고 선회 후 복원성이 향상되어 선회 주행 및 주차시에 스티어링휠 조작 편의성이 향상되는 효과가 있다.In addition, when the steering wheel is in a section other than the neutral section, the friction force is reduced, so that the left and right movements of the rack are relatively smooth, so that steering steering force of the steering wheel is reduced, and resilience is improved after turning, and the steering wheel is used during turning and parking. There is an effect that the operation convenience is improved.

상기와 같이 본 발명은 미소 조타 구간에서의 안정성과 선회 및 주차 조타 구간에서의 편의성을 동시에 향상시킬 수 있을 뿐만 아니라, 이와 같은 효과를 창출하는 발명의 구성이 매우 단순하고 전자제어장치가 필요 없으므로 장치 구성 비용이 적게 들고, 오작동이나 고장의 우려가 없는 장점이 있다.As described above, the present invention can not only improve the stability in the small steering section and the convenience in the turning and parking steering section at the same time, but also the configuration of the invention which creates such an effect is very simple and does not require an electronic control device. It is advantageous in that the configuration cost is low and there is no risk of malfunction or failure.

도 1은 일반적인 파워 스티어링 시스템의 외부 구성도,1 is an external configuration diagram of a general power steering system,

도 2는 기어박스의 내부 단면도 및 랙 지지구조를 도시한 사시도,Figure 2 is a perspective view showing the internal cross-sectional view and the rack support structure of the gearbox,

도 3은 본 발명이 적용된 기어박스의 단면도,3 is a cross-sectional view of the gearbox to which the present invention is applied;

도 4는 본 발명의 작동 상태도로서, (a)는 스티어링휠 중립 구간(미소 조타구간)에서의 작동상태이고, (b)는 그 외 구간(선회 및 주차 조타구간)에서의 작동상태를 도시한 것이다.Figure 4 is an operating state diagram of the present invention, (a) is the operating state in the steering wheel neutral section (smile steering section), (b) shows the operating state in other sections (turning and parking steering section). will be.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1 : 기어박스 2 : 랙1: gearbox 2: rack

3 : 타이로드 4 : 스티어링샤프트3: tie rod 4: steering shaft

5 : 피니언기어 6 : 연결관5: pinion gear 6: connector

7 : 오일펌프 8 : 오일리저버7: oil pump 8: oil reservoir

9 : 스티어링휠 10 : 로터리밸브9: steering wheel 10: rotary valve

11 : 랙서포트요크 12 : 요크스프링11: rack support yoke 12: yoke spring

13 : 요크플러그 14 : 록너트13: York Plug 14: Lock Nut

15 : 마찰부재 C : 고마찰부15: friction member C: high friction portion

이하, 본 발명을 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings the present invention will be described in detail.

도 3에 도시된 바와 같이, 유압식 파워스티어링 시스템은 실린더형 기어박스(1)의 내부에 랙(2)이 내장되고, 상기 랙(2)의 양단에 너클에 연결되는 타이로드(3)가 연결되며, 상기 랙(2)에는 스티어링샤프트에 연동되는 피니언기어(5)가 치합되고, 상기 랙(2)의 기어 형성부 후면은 기어박스(1)의 외부로부터 삽입된 랙서포트요크(11)에 의해 지지되는 구성을 포함한다.As shown in FIG. 3, in the hydraulic power steering system, a rack 2 is built into the cylindrical gearbox 1, and tie rods 3 connected to knuckles are connected to both ends of the rack 2. The rack 2 is engaged with the pinion gear 5 interlocked with the steering shaft, and the rear of the gear forming part of the rack 2 is connected to the rack support yoke 11 inserted from the outside of the gear box 1. It includes a configuration supported by.

상기 랙서포트요크(11)의 단부에는 내마모성 향상을 위한 부싱(11a)이 구비되며, 요크스프링에 의한 지지구조 및 요크플러그와 록너트에 의한 고정구조는 종래와 동일하다.The end of the rack support yoke 11 is provided with a bushing (11a) for improving wear resistance, the support structure by the yoke spring and the fixing structure by the yoke plug and the lock nut is the same.

상기와 같은 구성에 있어서, 본 발명은 스티어링휠 중립시 상기 랙서포트요크(11)의 부싱(11a)에 맞닿는 랙(2)의 부분에 그 외 부분보다 마찰계수가 큰 고마찰부(C)가 형성된 것을 특징으로 한다.In the configuration as described above, the present invention is a high friction portion (C) having a larger coefficient of friction than the rest of the portion of the rack (2) abuts the bushing (11a) of the rack support yoke 11 when the steering wheel is neutral Characterized in that formed.

상기 고마찰부(C)는 그 외 부분의 랙(2) 표면보다 큰 마찰계수를 갖는 별도의 마찰부재(15)를 랙(2)의 표면에 부착하거나, 표면가공을 통하여 형성된다.The high friction portion C is formed by attaching a separate friction member 15 having a larger coefficient of friction than the surface of the rack 2 of the other part to the surface of the rack 2 or by surface processing.

마찰부재(15)를 사용하는 경우에는 랙(2)의 표면에 안착홈을 형성하여 그 안착홈에 마찰부재(15)를 접착하는 방식으로 고마찰부(C)를 형성할 수 있다.When the friction member 15 is used, the high friction portion C may be formed by forming a mounting groove on the surface of the rack 2 and adhering the friction member 15 to the mounting groove.

또한, 표면가공방법으로서는 랙(2)의 표면에 미세한 스크래치를 형성하거나, 약품을 사용하여 표면을 부식시키거나, 내마모성이 우수한 재질의 미세 분말을 용제에 섞어 표면에 코팅하는 등의 방법을 통해 조도(표면 거칠기)를 증가시켜 고마찰부(C)를 형성할 수 있다.In addition, as a surface processing method, roughness may be formed by forming a fine scratch on the surface of the rack 2, corroding the surface with chemicals, or mixing a fine powder of a material having excellent abrasion resistance with a solvent to coat the surface. The high friction part C can be formed by increasing (surface roughness).

한편, 상기 고마찰부(C)는 스티어링휠이 중립 위치에 있을 때 상기 랙서포트요크(11)의 부싱(11a)에 맞닿는 부분뿐만 아니라 그 부분을 중심으로 하여 좌우 양측으로 소정의 추가구간을 포함한 범위로 확장 성형될 수 있다.On the other hand, the high friction portion (C) includes not only a portion of the rack support yoke 11 abutting the bushing (11a) when the steering wheel is in a neutral position, but includes a predetermined additional section on both the left and right sides of the portion. It can be expanded into a range.

여기서, 상기 추가구간은 차량이 직진로 주행 중 차선 변경을 위한 스티어링휠 조작시 상기 랙(2)이 좌우 이동하는 거리를 의미한다.Here, the additional section means a distance that the rack 2 moves left and right when the steering wheel is operated to change the lane while the vehicle is driving straight.

차량 직진 주행중 차선 변경시, 스티어링휠 조작은 대부분의 경우 중립위치로부터 좌우 30°이내에서 이루어지게 되므로 상기 고마찰부(C)는 스티어링휠이 중립위치에 있을 때 랙서포트요크(11)의 부싱(11a)이 맞닿는 부분을 중심으로 스티어링휠이 좌우로 30°조작되었을 때 상기 랙서포트요크(11)의 부싱(11a)이 맞닿는 부분까지의 영역에 형성되는 것이 바람직하다.When the lane is changed while driving straight, the steering wheel operation is generally made within 30 ° of the left and right from the neutral position, so that the high friction portion C is a bushing of the rack support yoke 11 when the steering wheel is in the neutral position. The steering wheel is preferably formed in the area up to the portion where the bushing 11a of the rack support yoke 11 abuts when the steering wheel is operated 30 ° to the left and right about the portion where 11a) abuts.

상기와 같이 스티어링휠 중립 위치 근방(=중립구간)에 있을 때, 랙(2)에 랙서포트요크(11)의 부싱(11a)이 맞닿는 고마찰부(C)가 형성됨으로써 요크스프링에 의해 탄지되는 랙서포트요크(11)에 의한 마찰력(정확히는 전술한 바와 같이 부싱(11a)과의 마찰에 의한 것이나, 이하 편의상 랙서포트요크(11)와의 마찰에 의한 것으로 기재한다.)은 상기 고마찰부(C)와 그 외 구간에서 상이하게 나타나게 된다.In the vicinity of the steering wheel neutral position (= neutral section) as described above, the high friction portion (C) in which the bushing (11a) of the rack support yoke 11 abuts on the rack (2) is supported by the yoke spring The frictional force by the rack support yoke 11 (exactly as described above is due to the friction with the bushing 11a, but for convenience, is described as the friction with the rack support yoke 11). ) And other sections.

즉, 도 4의 (a)와 같이 스티어링휠 중립구간에서는 랙서포트요크(11)가 상기 고마찰부(C)내에 위치하므로 랙(2)에 작용하는 마찰력이 크고, (b)와 같이 선회 및 주차 등과 같이 스티어링휠이 중립구간을 벗어난 위치에서는 랙서포트요크(11)가 고마찰부(C)를 벗어나게 되므로 마찰력의 크기가 감소하게 된다.(마찰력(F마찰)은 마찰계수(μ)×수직력(N), 고마찰부(C)의 마찰계수(μ1) ＞ 랙(2)의 마찰계수(μ2), 수직력(N) ＝ 스프링탄성계수(k)×스프링변위(Δx))That is, since the rack support yoke 11 is located in the high friction portion C, the frictional force acting on the rack 2 is large in the steering wheel neutral section as shown in FIG. 4 (a). the position where the steering wheel, such as a parked out of the neutral zone is the size of the frictional force reduction, so the rack support yoke 11 are off the high-friction portion (C). (frictional force (F friction) is the coefficient of friction (μ) × vertical force (N), friction coefficient of high friction portion (C) (μ1)> friction coefficient of rack (μ2), vertical force (N) = spring modulus (k) x spring displacement (Δx))

따라서, 직진 유지 및 직진 주행 중 차선 변경과 같은 미소 조타시에는 상기 도 4(a)와 같이 랙서포트요크(11)가 고마찰부(C)내에서 정지 및 이동하게 되므로 랙(2)에 큰 마찰력이 작용하여 랙(2)의 이동이 억제됨으로써 시미, 킥백, 토크스티어 및 쏠림 현상이 개선되어 스티어링휠의 조작 안정성이 향상된다.Therefore, when the small steering such as lane change during straight maintenance and straight driving, the rack support yoke 11 stops and moves in the high friction part C as shown in FIG. Friction is applied to the movement of the rack (2) is suppressed to improve the taste, kickback, torque steering and pull phenomenon to improve the operating stability of the steering wheel.

또한, 선회 주행 및 주차시와 같이 스티어링휠 조작량이 큰 경우에는 도 4(b)와 같이 랙서포트요크(11)가 고마찰부(C)를 벗어나 그 외측의 랙(2) 표면에 접촉하므로 랙(2)에 작용하는 마찰력이 감소하여 랙(2)의 이동이 원활해짐으로써 조향 답력이 감소하고 선회 주행 후 복원성이 향상되어 스티어링휠의 조작 편의성이 향상된다.In addition, when the steering wheel operation amount is large, such as when turning and parking, the rack support yoke 11 is out of the high friction portion C and contacts the surface of the rack 2 outside as shown in FIG. 4 (b). The frictional force acting on (2) is reduced to facilitate the movement of the rack (2), thereby reducing the steering effort and improving the recovery after turning driving, thereby improving the operation convenience of the steering wheel.

한편, 본 발명은 상기와 같이 간단한 구성으로 이루어지고, 일반적인 가변장치나 조절장치와 같이 별도의 전자제어장치가 필요 없으므로 장치의 구성에 비용이 적게 들고, 오작동이나 고장의 우려가 없는 장점이 있다.On the other hand, the present invention is made of a simple configuration as described above, there is no need for a separate electronic control device, such as a general variable device or control device, the cost of the device is low, there is an advantage that there is no fear of malfunction or failure.

Claims (5)

기어박스와,With the gearbox, 상기 기어박스에 내장되고 스티어링샤프트에 연동되는 피니언기어에 치합된 랙과,A rack fitted to the pinion gear built in the gearbox and interlocked to the steering shaft; 상기 기어박스의 외부로부터 삽입되고 요크스프링에 지지되어 상기 랙의 기어 형성부 후면을 지지하고 랙과의 접촉면에 부싱을 구비한 랙서포트요크 및,A rack support yoke inserted from the outside of the gear box and supported by the yoke spring to support the rear of the gear forming part of the rack and having a bushing on a contact surface with the rack; 상기 스티어링휠이 중립위치에 있을 때 상기 랙서포트요크에 맞닿는 랙의 부분에 형성된 고마찰부High friction portion formed in the portion of the rack that abuts the rack support yoke when the steering wheel is in the neutral position 를 포함하는 자동차의 스티어링 랙 마찰력 가변장치.The steering rack friction force variable device of the vehicle comprising a. 청구항 1에 있어서, 상기 고마찰부는 스티어링휠이 중립 위치에 있을 때 상기 랙서포트요크가 맞닿는 부분을 중심으로 그 좌우 양측으로 차량의 차선변경시 행해지는 스티어링휠 조작에 의한 상기 랙의 좌우 이동거리만큼 형성된 것을 특징으로 하는 The method according to claim 1, wherein the high friction portion as the left and right movement distance of the rack by the steering wheel operation to be performed when the lane of the vehicle to the left and right sides of the center of the contact portion of the rack support yoke when the steering wheel is in a neutral position Characterized in that formed 자동차의 스티어링 랙 마찰력 가변장치.Variable friction force on the steering rack of the car. 청구항 1에 있어서, 상기 고마찰부는 랙의 표면보다 마찰계수가 큰 것을 특징으로 하는 The method of claim 1, wherein the high friction portion is characterized in that the friction coefficient is greater than the surface of the rack 자동차의 스티어링 랙 마찰력 가변장치.Variable friction force on the steering rack of the car. 청구항 3에 있어서, 상기 고마찰부는 상기 랙에 안착홈이 형성되고, 그 안착홈에 마찰부재가 접착되어 형성된 것을 특징으로 하는The method of claim 3, wherein the high friction portion is characterized in that the mounting groove is formed in the rack, the friction member is bonded to the mounting groove 자동차의 스티어링 랙 마찰력 가변장치.Variable friction force on the steering rack of the car. 청구항 3에 있어서, 상기 고마찰부는 상기 랙의 표면가공을 통하여 형성된 것을 특징으로 하는The method of claim 3, wherein the high friction portion is characterized in that formed through the surface processing of the rack 자동차의 스티어링 랙 마찰력 가변장치.Variable friction force on the steering rack of the car.
KR1020080017691A 2008-02-27 2008-02-27 variable friction system for steering lack of a car KR100921071B1 (en)

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US9493182B2 (en) 2013-12-27 2016-11-15 Hyundai Motor Company System and method for compensating friction according to rack bending of MDPS

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JPS5981254A (en) 1982-10-29 1984-05-10 Nissan Motor Co Ltd Support structure of rack-and-pinion type steering gear
KR900002221B1 (en) 1984-07-09 1990-04-06 미쯔비시지도오샤고오교오 가부시기가이샤 Steering gear mechanism
KR20040044290A (en) * 2002-11-21 2004-05-28 현대자동차주식회사 shimmy and shake reducing device for steering system
KR100866539B1 (en) 2003-02-19 2008-11-04 주식회사 만도 An Electric Type Power Steering Apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9493182B2 (en) 2013-12-27 2016-11-15 Hyundai Motor Company System and method for compensating friction according to rack bending of MDPS

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