KR20020052267A - variable steering system of vehicle - Google Patents

variable steering system of vehicle Download PDF

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Publication number
KR20020052267A
KR20020052267A KR1020000081506A KR20000081506A KR20020052267A KR 20020052267 A KR20020052267 A KR 20020052267A KR 1020000081506 A KR1020000081506 A KR 1020000081506A KR 20000081506 A KR20000081506 A KR 20000081506A KR 20020052267 A KR20020052267 A KR 20020052267A
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KR
South Korea
Prior art keywords
vehicle
steering
gear
gears
gear part
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KR1020000081506A
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Korean (ko)
Inventor
김남영
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이계안
현대자동차주식회사
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Priority to KR1020000081506A priority Critical patent/KR20020052267A/en
Publication of KR20020052267A publication Critical patent/KR20020052267A/en

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    • 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
    • B62D5/008—Changing the transfer ratio between the steering wheel and the steering gear by variable supply of energy, e.g. by using a superposition gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/02—Control of vehicle driving stability
    • B60W30/045—Improving turning performance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/166—Means changing the transfer ratio between steering wheel and steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00—Purposes or special features of road vehicle drive control systems
    • B60Y2300/02—Control of vehicle driving stability
    • B60Y2300/045—Improving turning performance, e.g. agility of a vehicle in a curve

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automation & Control Theory (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

PURPOSE: A variable steering system of a vehicle is provided to improve responsiveness and convenience in steering by adjusting the steering gear ratio according to the traveling state of the vehicle. CONSTITUTION: A variable steering system for a vehicle is composed of a lower steering shaft(300) transmitting motion of a steering wheel; a middle gear part(400) including first, second and third gears(410,420,430) having the different rpm by engaging with the lower steering shaft selectively; a pinion gear part(500) connected to the lower part of the middle gear part to transmit rotational steering force to a rack gear part(600); a vehicle speed sensor(110) detecting travel speed of the vehicle and outputting the signal; a control unit(100) outputting the control signal corresponding to the signal from the vehicle speed sensor; and a motor(200) engaging the lower steering shaft with the first, second or third gear according to the control signal from the control unit. Responsiveness and convenience are improved with adjusting the steering gear ratio automatically according to the traveling state of the vehicle.

Description

차량의 가변조향시스템{variable steering system of vehicle}Variable steering system of a vehicle

본 발명은 차량용 가변조향시스템에 관한 것으로, 특히 주행중인 차량의 속도에 따라 조향핸들의 조작력을 증감시켜 운전자의 조향 조작성을 향상시킬 수 있도록 한 차량의 가변조향시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable steering system for a vehicle, and more particularly, to a variable steering system of a vehicle that can increase or decrease the steering force of a steering wheel according to a speed of a vehicle that is being driven to improve a driver's steering operability.

일반적으로 차량의 조향장치는 자동차의 주행중 이를 운전하는 운전자가 자동차의 진행방향을 임의로 바꾸기 위한 장치로서, 크게 조작기구, 기어기구, 링크기구로 대별된다.In general, a steering device of a vehicle is a device for arbitrarily changing the driving direction of a vehicle by a driver who drives the vehicle while driving. The steering device of the vehicle is roughly classified into an operation mechanism, a gear mechanism, and a link mechanism.

조작기구는 운전자가 직접 조향조작을 하여 그 조작력을 후술되는 기어기구와 링크기구의 각 기구로 전달하는 부분이며, 조향 휠, 조향 샤프트 및 조향 칼럼등으로 이루어진다.The operating mechanism is a part which the driver directly steers and transmits the operating force to each mechanism of the gear mechanism and link mechanism which will be described later, and comprises a steering wheel, a steering shaft and a steering column.

그리고, 기어기구는 조향 샤프트의 회전을 감속함으로써, 조작력을 증대시킴과 동시에 조작기구의 운동방향을 변환시켜 링크기구에 전달하는 부분이며, 링크기구는 움직임을 차륜에 전달함과 동시에 좌우 바퀴의 관계위치를 올바르게 유지하는 부분으로, 피트먼 암, 드레그 링크, 너클암 및 타이로드등으로 구성되어 있다.In addition, the gear mechanism reduces the rotation of the steering shaft, thereby increasing the operating force and at the same time converting the movement direction of the operating mechanism to the link mechanism. The link mechanism transmits the movement to the wheel, and at the same time the relationship between the left and right wheels. It is a part that correctly maintains a position, and is composed of a pitman arm, a drag link, a knuckle arm and a tie rod.

그런데, 최근에는 운전자의 조향에 따른 피로도를 경감시키기 위해 동력조향시스템이 대다수의 자동차에 적용되고 있다.In recent years, however, a power steering system has been applied to most automobiles in order to reduce fatigue caused by driver's steering.

동력조향시스템은 그 기어방식에 따라 여러 타입이 있으나, 여기서는 랙과 피니언타입에 한정하여 설명하기로 한다.There are several types of power steering systems, depending on the gearing method, but here, only the rack and pinion types will be described.

종래 차량의 조향시스템은, 도 1에 도시된 바와 같이, 조향기어박스(10)와, 조향기어박스(10)내에 설치되고 조향핸들의 회전력에 의해 회전되는 조향샤프트(20)와, 그 조향샤프트(20)에 연결되어 연동 회전되는 피니언기어(40)와, 그 피니언기어(40)에 치합되어 그 회전력에 의해 직각으로 왕복운동되는 랙기어(50)등으로 구성된다.As shown in FIG. 1, a conventional vehicle steering system includes a steering gear box 10, a steering shaft 20 installed in the steering gear box 10 and rotated by the rotational force of the steering wheel, and a steering shaft thereof. It is composed of a pinion gear 40 connected to the rotation 20 and the rack gear 50 is engaged with the pinion gear 40 and reciprocated at right angles by the rotational force.

미설명부호 "30"은 플렉시블 조인트를 나타낸 것이다.Unexplained reference numeral 30 denotes a flexible joint.

이러한 구성의 조향시스템은 조향 기어비가 피니언과 랙의 기어비와 모듈에의해 고정되어 있다.In this configuration, the steering gear ratio is fixed by the gear ratio of the pinion and rack and the module.

또한, 종래의 동력조향시스템은 유량을 제어함에 있어 압력을 고정시킨 상태에서 유량을 제어하는 것과, 압력의 변화와 무관하게 유속을 제어시키는 형태의 두가지 방식으로 유량을 제어하여 왔는데, 위 기술들은 펌프의 회전수에 따른 유량제어로서 차속과는 무관하게 유량이 제어되는 것이다.In addition, the conventional power steering system has been used to control the flow rate in the form of controlling the flow rate at a fixed pressure and the flow rate regardless of the pressure change in controlling the flow rate. The flow rate is controlled according to the number of revolutions, and the flow rate is controlled regardless of the vehicle speed.

따라서, 기존에는 조향 기어비가 저속에 고정되어 있다면, 고속 주행에서 운전자가 조향 조작할 때 너무 민감하게 응답하는 단점과, 조향 기어비가 고속에 고정되어 있을 경우에는 고속 주행시 조작력이 많이 요구되는 단점이 있었다.Therefore, in the past, if the steering gear ratio is fixed at low speed, there is a disadvantage in that the driver responds too sensitively when steering is operated at high speed, and when the steering gear ratio is fixed at high speed, much manipulation force is required at high speed. .

본 발명은 상기한 제반문제점을 감안하여 안출된 것으로, 그 목적은 차량의 주행상태에 따라 조향 기어비가 자동적으로 가변 조정되어 운전자의 조향 편의성을 증대시킬 수 있도록 한 차량의 가변조향시스템을 제공하는 데 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a variable steering system of a vehicle, in which a steering gear ratio is automatically adjusted according to a driving state of a vehicle to increase a driver's steering convenience. have.

도 1은 종래 차량의 랙과 피니언타입의 조향시스템을 나타낸 도면.1 is a view showing a rack and pinion type steering system of a conventional vehicle.

도 2는 본 발명에 따른 차량의 가변조향시스템을 나타낸 구성도.2 is a block diagram showing a variable steering system of a vehicle according to the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

100 : 제어부110 : 차속센서100: control unit 110: vehicle speed sensor

200 : 모터300 : 하부조향축200: motor 300: lower steering shaft

310,320,330 : (하부조향축의)기어들310,320,330: Gears (lower steering shaft)

400 : 중간기어부400: middle gear part

410,420,430 : (중간기어부의)제 1,2,3기어410,420,430: First, second and third gears

500 : 피니언 기어부600 : 랙기어부500: pinion gear portion 600: rack gear portion

상기한 목적을 달성하기 위한 본 발명은 주행중인 차량의 주행속도를 검출하고 검출된 값을 신호로 출력하는 차속센서와,The present invention for achieving the above object is a vehicle speed sensor for detecting the traveling speed of the vehicle being driven and outputs the detected value as a signal;

상기 차속센서로부터 출력된 신호에 따라 대응되는 제어신호를 출력하는 제어부와,A control unit for outputting a control signal corresponding to the signal output from the vehicle speed sensor;

상기 제어부의 제어신호에 따라 상하 직선 운동하는 모터와,A motor for linearly moving up and down according to the control signal of the controller;

상기 모터의 운동에 따라 상하 이동되며 상단부에 각기 다른 회전수를 갖는 제 1,2,3기어들이 형성된 중간기어부와,An intermediate gear part which is moved up and down according to the movement of the motor and has first, second and third gears having different rotational speeds at upper ends thereof;

하단부에 상기 중간기어부의 제 1,2,3기어들중 하나가 선택적으로 치합되도록 기어들이 형성된 하부조향축과,A lower steering shaft in which gears are formed such that one of the first, second and third gears of the intermediate gear part is selectively engaged at a lower end thereof;

상기 중간기어부의 하단부에 연결되어 랙기어부에 회전 조향력을 전달하는 피니언 기어부로 구성된 것을 특징으로 한다.It is characterized in that the pinion gear portion is connected to the lower end of the intermediate gear portion and transmits a rotational steering force to the rack gear.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 차량의 가변조향시스템은, 도 2 참조, 조향휠(미도시)의 움직임을 전달하는 하부조향축(300)과, 상단부에 하부조향축(300)과 선택적으로 치합되어 서로 다른 회전수를 갖는 제 1,2,3기어(410,420,430)가 형성되는 중간기어부(400)와, 중간기어부(400)의 하단부에 연결되어 랙기어부(600)에 회전 조향력을 전달하는 피니언 기어부(500)와, 주행중인 차량의 주행속도를 검출하고 검출된 값을 신호로 출력하는 차속센서(110)와, 차속센서(110)로부터 출력된 신호에 따라 대응되는 제어신호를 출력하는 제어부(100)와, 제어부(100)의 제어신호에 따라 중간기어부(400)의 제 1,2,3기어(410,420,430)중 하나를 택일하여 하부조향축(300)에 치합시키기 위한 모터(200)를 구비하여 된 것이다.In the variable steering system of the vehicle according to the present invention, see Figure 2, the lower steering shaft 300 for transmitting the movement of the steering wheel (not shown), and the upper end is selectively engaged with the lower steering shaft 300 to rotate different from each other Intermediate gear part 400 having the first, second, third gears 410, 420, 430 having a number formed therein, and pinion gear part 500 connected to the lower end of the intermediate gear part 400 to transmit rotational steering force to the rack gear part 600. ), A vehicle speed sensor 110 that detects the traveling speed of the vehicle being driven and outputs the detected value as a signal, and a controller 100 that outputs a corresponding control signal according to the signal output from the vehicle speed sensor 110; In accordance with the control signal of the controller 100, one of the first, second, third and third gears (410, 420, 430) of the intermediate gear unit 400 is provided with a motor 200 for engaging with the lower steering shaft 300. .

더 상세히 설명하면, 중간기어부(400)는 저속주행에 사용되는 제 1기어와, 중속주행시 사용되는 제 2기어와, 고속주행시 사용되는 제 3기어가 상단부에 형성되어 그 기어들중 하나가 하부조향축(300)의 기어들(310,320,330)에 선택적으로 치합되는 구조를 갖는다.In more detail, the intermediate gear part 400 includes a first gear used for low speed driving, a second gear used for medium speed driving, and a third gear used for high speed driving, formed at an upper end thereof, and one of the gears is steered. It has a structure that is selectively engaged with the gears (310, 320, 330) of the shaft (300).

또한, 중간기어부(400)는 하부조향축(300)의 조향력을 랙기어부(600)에 전달하도록 하단부가 피니언 기어부(500)와 연결되는 구조를 갖는다.In addition, the intermediate gear part 400 has a structure in which the lower end part is connected to the pinion gear part 500 so as to transmit steering force of the lower steering shaft 300 to the rack gear part 600.

모터(200)는 제어부(100)의 제어신호에 따라 중간기어부(400)를 상하 이동시키기 위하여 스텝모터(200)를 채용함이 바람직하다.The motor 200 preferably employs the step motor 200 to move the intermediate gear 400 up and down according to the control signal of the controller 100.

이러한 구성을 갖는 본 발명의 작용은 다음과 같다.The operation of the present invention having such a configuration is as follows.

차속센서(110)로부터 차량의 주행상태가 제어부(100)로 입력되면, 제어부(100)에서 그 주행상태에 적합한 제어신호를 모터(200)에 인가하게 되고, 이어서 모터(200)는 중간기어부(400)를 상하 적정위치로 이동시켜 제 1,2,3기어(410,420,430)중 하나를 하부조향축(300)의 기어들(310,320,330)에 치합시킨다.When the driving state of the vehicle is input to the controller 100 from the vehicle speed sensor 110, the control unit 100 applies a control signal suitable for the driving state to the motor 200, and then the motor 200 receives an intermediate gear unit ( By moving 400 to an appropriate position up and down, one of the first, second and third gears 410, 420, 430 is engaged with the gears 310, 320, 330 of the lower steering shaft 300.

이때, 중간기어부(400)는 하부조향축(300)의 조향력을 피니언 기어부(500)측에 전달하게 되고, 이 조향력은 피니언 기어부(500)를 통해 랙기어부(600)로 전달된다.At this time, the intermediate gear unit 400 transmits the steering force of the lower steering shaft 300 to the pinion gear unit 500 side, and the steering force is transmitted to the rack gear unit 600 through the pinion gear unit 500.

이후의 조향력 전달과정은 기존의 것과 동일한 과정을 거쳐 양측 바퀴에 전달된다.The subsequent steering force transmission process is transmitted to both wheels through the same process as the conventional one.

즉, 차량의 주행상태가 저속일 경우, 중간기어부(400)의 제 1기어가 하부조향축(300)에 치합되고, 중속일 때는 제 2기어가, 고속일 때는 제 3기어가 각각 치합되어 차량의 차속에 적합한 회전수의 조향 기어비를 갖게 된다.That is, when the driving state of the vehicle is a low speed, the first gear of the intermediate gear unit 400 is meshed with the lower steering shaft 300, the second gear is engaged at medium speed, and the third gear is engaged at high speed. It will have a steering gear ratio of the rotational speed suitable for the vehicle speed.

이상과 같이 설명한 본 발명은 차량의 주행속도에 대응되는 조향 기어비를 가질 수 있도록 한 것인바, 이에 따르면 본 발명은 조향 기어비가 차량의 주행 속도에 적합하게 가변되므로, 조향 조작시 응답성이 향상되는 효과를 갖는다.The present invention as described above is to have a steering gear ratio corresponding to the traveling speed of the vehicle bar according to the present invention, the steering gear ratio is variable to suit the traveling speed of the vehicle, thereby improving the responsiveness during steering operation Has an effect.

Claims (1)

주행중인 차량의 주행속도를 검출하고 검출된 값을 신호로 출력하는 차속센서(110)와,A vehicle speed sensor 110 which detects a driving speed of a vehicle that is driving and outputs the detected value as a signal; 상기 차속센서(110)로부터 출력된 신호에 따라 대응되는 제어신호를 출력하는 제어부(100)와,A controller 100 for outputting a control signal corresponding to the signal output from the vehicle speed sensor 110; 상기 제어부(100)의 제어신호에 따라 상하 직선 운동하는 모터(200)와,A motor 200 linearly moving up and down according to the control signal of the controller 100, 상기 모터(200)의 운동에 따라 상하 이동되며 상단부에 각기 다른 회전수를 갖는 제 1,2,3기어(410,420,430)들이 형성된 중간기어부(400)와,An intermediate gear part 400 which is moved up and down according to the movement of the motor 200 and has first, second, and third gears 410, 420, and 430 having different rotational speeds; 하단부에 상기 중간기어부(400)의 제 1,2,3기어(410,420,430)들중 하나가 선택적으로 치합되도록 기어(310,320,330)가 형성되는 하부조향축(300)과,A lower steering shaft 300 in which gears 310, 320, 330 are formed to selectively engage one of the first, second, third gears 410, 420, 430 of the intermediate gear part 400 at a lower end thereof; 상기 중간기어부(400)의 하단부에 연결되어 랙기어부(600)에 회전 조향력을 전달하는 피니언 기어부(500)로 구성된 것을 특징으로 하는 차량의 가변조향시스템.The pinion gear unit 500 is connected to the lower end of the intermediate gear unit 400 to transmit a rotational steering force to the rack gear unit 600, characterized in that consisting of a vehicle.
KR1020000081506A 2000-12-26 2000-12-26 variable steering system of vehicle KR20020052267A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100764163B1 (en) * 2003-10-06 2007-10-05 주식회사 만도 Active front steering system
KR100788735B1 (en) * 2006-03-01 2008-01-02 스미도모쥬기가이고교 가부시키가이샤 Series of power transmission apparatus and series of geared motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100764163B1 (en) * 2003-10-06 2007-10-05 주식회사 만도 Active front steering system
KR100788735B1 (en) * 2006-03-01 2008-01-02 스미도모쥬기가이고교 가부시키가이샤 Series of power transmission apparatus and series of geared motor

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