WO2011129509A1 - Electrical power-steering apparatus - Google Patents

Electrical power-steering apparatus Download PDF

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Publication number
WO2011129509A1
WO2011129509A1 PCT/KR2010/008288 KR2010008288W WO2011129509A1 WO 2011129509 A1 WO2011129509 A1 WO 2011129509A1 KR 2010008288 W KR2010008288 W KR 2010008288W WO 2011129509 A1 WO2011129509 A1 WO 2011129509A1
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WO
WIPO (PCT)
Prior art keywords
shaft
output
bearing
input
electric power
Prior art date
Application number
PCT/KR2010/008288
Other languages
French (fr)
Korean (ko)
Inventor
홍성종
송강석
박병선
Original Assignee
남양공업㈜
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 남양공업㈜ filed Critical 남양공업㈜
Priority to CN201080061563.1A priority Critical patent/CN102712335B/en
Publication of WO2011129509A1 publication Critical patent/WO2011129509A1/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
    • B62D5/04—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
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel

Definitions

  • the present invention relates to an electric power steering apparatus having a worm gear preload mechanism. More particularly, the present invention relates to an electric power steering system capable of reducing assembly lattices resulting from the worm gear portion and the lattices of the worm gear, and improving assembly performance. It is related to the steering device.
  • the power steering system is applied to the vehicle to ensure the stability of the steering state.
  • a hydraulic power steering system HPS
  • HPS hydraulic power steering system
  • EPS environmentally friendly electric power steering system
  • the electric power steering system drives the motor in the ECU according to the vehicle's driving conditions detected by the vehicle speed sensor and the steering torque sensor to give a light and comfortable steering feeling at low speeds, and provides a good steering stability at high speeds. In the emergency situation, the steering is performed quickly to provide the driver with optimal steering conditions.
  • C-EPS column type
  • P-EPS pinion type
  • R-EPS rack type
  • the rack-type (R-EPS) steering system of the electric power steering system has an obtuse or acute inclination at one side of the rack housing, and the pinion gear of the electric motor installed is engaged with the driven gear of the ball nut supporting the outer peripheral part of the rack bar.
  • the ball nut is rotated by the driving force of the electric motor, and the rack bar is slid left and right by this rotational force, so that an assist force due to steering of the handle is generated.
  • the axial distance between the gear accommodating side of the housing and the output shaft of the drive motor is set to the same distance with respect to the axial distance including the engagement radius of each of the worm and the worm gear.
  • Such additional backlash acts as a major factor that impairs reliability and technical level, such as imparting discomfort to the driver due to the rattle sound when the vehicle travels in a bad lane.
  • the present invention has been made to solve the above problems, the object of the present invention is to solve the above-mentioned disadvantages of the prior art, to suppress the backlash, and without impairing the transmission performance of the auxiliary steering force, at the spline joint
  • the main technical problem is to provide an electric power steering apparatus having a simple configuration that can reduce the generated rattle sound.
  • a torque sensor for detecting the torque of the input torque shaft and the output torque shaft constituting the output shaft;
  • the sliding structure between the input torque shaft and the output torque shaft and the simple structure make it possible to significantly improve the assembly and torque sensing capability, and to help improve overall reliability.
  • the bearing on the side opposite to the drive motor is surrounded by a bearing support member surrounding the outer circumferential surface of the bearing,
  • the elastic ring member is coupled to the annular groove formed on the outer circumferential surface of the bearing support member,
  • the spherical body is configured to be in contact.
  • the spherical body is preferably selected from the rubber, urethane, carbon glass fiber, engineering plastics having damping properties are employed.
  • the through hole may be a slot formed long in the outer circumferential direction so that the spherical body can move the set distance along the outer circumferential surface.
  • the drive motor is mounted to the housing and generates an auxiliary steering drive force
  • the rotary shaft is supported by the motor side outer bearing installed in the housing, splined to the shaft of the drive motor, and the predetermined position of the housing It includes an output shaft for supporting shaft and transmitting steering force, and a reduction gear composed of a worm and a worm gear that are integrally coupled to the worm, which is integrally formed on the rotating shaft, to transmit the auxiliary steering force of the driving motor to the output shaft by using the worm gear.
  • the output shaft is composed of an input torque shaft and an output torque shaft coaxially integrated integrally with a torque sensor in the center, and on one outer peripheral surface facing the input torque shaft and the output torque shaft, Input the torque of the input and output torque shafts connected to the input and output rotors of the torque sensor to be measured and transmitted to the ECU. And an input engagement hole and an output engagement hole respectively engaged with the input engagement protrusion on the rotor side and the output engagement protrusion on the rotor side, respectively.
  • a spherical body and elasticity capable of one-way pressing the outer circumferential surface of a bearing as a part of a clearance compensation means on a worm side rotation shaft By providing the ring member, it is possible to compensate for the play caused by the wear of the worm shaft, and to have a very excellent effect of reducing noise such as rattle sound.
  • FIG. 1 is a perspective structural diagram showing an electric power steering apparatus according to an embodiment of the present invention.
  • FIG. 2 is a front structural diagram of the electric power steering apparatus of FIG. 1;
  • FIG. 3 is a longitudinal cross-sectional view taken along the line A-A of FIG.
  • FIG. 4 is a cross-sectional structural view partially cut along the line A-A of FIG.
  • FIG. 5 is an exploded perspective structural view showing only a rotating shaft excluding an output shaft and supporting elements supporting the rotating shaft in FIG. 4;
  • FIG. 6 is a longitudinal cross-sectional view taken along the line B-B of FIG.
  • FIG. 7 is an enlarged cross-sectional structural view showing an enlarged portion C of FIG.
  • FIGS. 1 and 6 are exploded perspective views illustrating an exploded view of the internal components of FIGS. 1 and 6;
  • FIG. 9 is a perspective illustration of the coalescing perspective of the components in FIG.
  • FIG. 10 is a longitudinal cross-sectional view taken along the line D-D of FIG. 9;
  • FIG. 11 is a vertical cross-sectional view illustrating only the output torque member and the input torque member of the coil shaft in FIG. 10;
  • FIG. 12 is an assembled perspective view showing only the coil shaft output torque member and the input torque member in FIG.
  • the drive motor (M) is mounted to the housing 10 and generates an auxiliary steering drive force, and the motor side and outer side bearings 20 and 30 installed in the housing 10
  • Rotation shaft 40 which is supported by the drive shaft, and is splined to the motor shaft of the drive motor M, an output shaft 50 for being axially supported at a predetermined position of the housing 10, and transmitting a steering force, and the rotation shaft 40
  • the rotation shaft 40 Including a reduction gear consisting of a worm 41 and a worm gear 43 to be engaged with the worm 41 and integrally formed on the), the auxiliary steering force of the drive motor (M) using the worm gear 43
  • FIG. 1 is a perspective structural diagram showing the overall configuration of an electric power steering apparatus according to an embodiment of the present invention.
  • the outer bearing 30 facing the drive motor M is configured to be surrounded by a bearing support member 60 surrounding the outer circumferential surface of the outer bearing 30.
  • the elastic ring member 70 having one side open is coupled to the annular groove 61 formed on the outer circumferential surface of the bearing support member 60.
  • the spherical body 80 is formed between the elastic ring member 70 and the outer circumferential surface of the outer bearing 30 through a through hole 61a formed on the outer circumferential side of the annular groove 61 of the bearing support member 60. Is configured to contact.
  • the spherical body 80 is selected from rubber, urethane, carbon glass fiber, and engineering plastic having damping properties.
  • the through hole 61a may adopt a structure in which the spherical body 80 is formed as a slot elongated in the direction along the outer circumferential surface such that the spherical body 80 can move a set distance along the outer circumferential surface.
  • the output shaft 50 is composed of an input torque shaft 51 and an output torque shaft 53 coupled coaxially integrally with a torque sensor 100 in the center.
  • the input engagement port 51a is formed continuously to the position corresponding to half of the input torque shaft 51. Because of this, it is possible to solve the assembly disadvantage that must be mounted inside the housing 10 in the state in which the torque sensor 100 and the output torque shaft 53 is combined. That is, since the input engagement hole 51a is recessed over the entire thick portion, which is half of the input torque shaft 51, the input engagement port 51a is pushed at once even if it is assembled after the fact, instead of being assembled integrally with the torque sensor 100. It will be possible to achieve a configuration that can be put into assembly.
  • the torque sensor 100 can be easily assembled by injecting the torque sensor 100 from one side of the input torque shaft 51.
  • the low risk of inflow of foreign substances and the assemblability can be further improved.
  • an output fastening protrusion 103 is formed in the center of the output rotor, and the output engagement hole 53a of the output torque shaft 53 is press-fitted to the output fastening protrusion 103 on the output rotor side.
  • an input fastening protrusion 101 on the input rotor side is formed at the center of the input rotor to insert and fix the input engaging holes 51a of the input torque shaft 51 to the input fastening protrusion 101 on the input rotor side. It is.
  • One side of the worm gear 43 is equipped with a torque sensor 100 connected to the worm gear 43 and the output torque shaft 53.
  • the torque sensor 100 measures the torque of the input torque shaft 51 and the output torque shaft 53 and transmits the torque to the ECU, thereby operating the driving motor in the ECU to provide steering assistance.
  • the torque sensor 100 includes an output rotor (not shown), an input rotor (not shown), and a cover 100a, and an output fastener 103 on the output rotor side is formed at the center of the output rotor.
  • the output torque shaft 53 is press-fitted to the output fastening protrusion 103 on the output rotor side.
  • the input fastening protrusion 101 is connected to the input torque shaft 51 at the center of the input rotor to connect the input torque shaft 51 to the input torque shaft 51 and the input fastening protrusion 101. It is structured.
  • the cover 100a encloses the output rotor and the input rotor, and the cover protects the output rotor and the input rotor while connecting the output rotor and the input rotor to an electronic control unit (aka, 'ECU'). do.
  • the flange 46a, 47a-equipped bush-type damping members 46, 47 having a cross-sectional shape of ' ⁇ ' shape so as to surround the inner ring and the both end surfaces of the motor side bearing 20 at the same time. ) Is assembled.
  • reference numerals 48 and 49 are steel rings for supporting the outermost sides of the bushing damping members 46 and 47, and the damping members 46 having vibration and shock absorbing functions on both sides of the motor side bearing 20 are provided. 47) is fixed to both sides for fixing base.
  • the flanges 46a and 47a-the damping members 46 and 47 are compressed at the inner ring and both outer end portions of the motor-side bearing 20, so that the flanges 46a and 47a-the damping members 46 and 47 are all around the radial displacement of the rotating shaft 40. Generates uniform repulsive force. For this reason, when there is no load, it floats with respect to the inner ring of the motor side bearing 20 of the rotating shaft in which the worm 41 was formed, and the inner ring of the rotating shaft 40 and the motor side bearing 20 do not contact each other. It will remain in a state that does not.
  • damping members 46 and 47 which have vibration and shock absorption functions on both sides of the motor side bearing 20 are made of rubber or urethane.
  • the input torque shaft 51 and the output torque shaft 53 are formed by the sleeve 90 of the plastic material so that the sleeve 90 of the input torque shaft 51 can reduce the initial friction torque and achieve the desired rotational performance.
  • the sleeve 90 of the engineering plastic material that can be assembled without the use of lubricating oil to reduce the initial friction torque during rotation and ensure a smooth rotational performance, Stable output performance of the torque sensor can be achieved.
  • the resilient ring member 70 while wrapping the outer peripheral portion of the outer bearing 30 for supporting the shaft end of the worm 41, at the same time spherical to the outer peripheral surface of the bearing 30
  • the sieve 80 is always brought into contact so that the axial and radial play of the worm 41 can be flexibly absorbed or compensated.
  • the electric motor driving command is calculated by the ECU according to the driving conditions of the vehicle detected by the vehicle speed sensor and the steering torque sensor 100 to drive the electric motor at an appropriate rotational speed.
  • the rotational force of the electric motor is transmitted to the steering shaft while being decelerated at an appropriate rotational speed while passing through a reduction gear including a worm 41 and a worm gear 43 to assist the steering wheel steering force of the driver.
  • the elastic ring member 70 and the spherical body 80 is positioned to surround the outer circumferential surface of the outer bearing 30 supporting the worm 41, which is a reduction gear, thereby providing a reduction gear due to frequent friction.
  • this makes it possible to regulate the maximum of the noise (rattle noise) including the rattle sound due to irregular contact between the gear teeth.
  • the preload is applied to the outer bearing 30 on the side supporting the outer portion of the rotating shaft 40, whereby the worm 41 and the worm gear 43 are always By coming into contact with each other, the play of this part is severely regulated.
  • the torque sensor 100 for detecting the torque of the input torque shaft 51 and the output torque shaft 53 constituting the output shaft 50 and the input torque shaft 51 and the output torque shaft 53 of a simple configuration Through the connection structure, it is possible to greatly improve the assemblability and the sense of torque sensing, which can help to improve the overall reliability.

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

Abstract

The present invention relates to an electrical power-steering apparatus, and particularly, to an electrical power-steering apparatus that uses a worm gear to transfer assistive steering force from a drive motor to an output shaft, wherein: a bearing at the side opposite the drive motor is surrounded at the outer periphery thereof by a bearing-supporting member; a resilient ring member is coupled to an annular slot defined in the outer periphery of the bearing-supporting member; spherical bodies are configured to contact each other in between the outer peripheries of the resilient ring member and the bearing, through a through-hole defined in one side of the outer periphery of the bearing-supporting member; and a worm gear preloading mechanism is provided so as to reduce the gap generated at the portion of the worm gear and reduce rattling noises caused by the gap while improving assemblability at the same time.

Description

전동 파워스티어링 장치Electric power steering system
본 발명은 웜기어 예압기구를 갖는 전동 파워 스티어링 장치에 관한 것으로, 더욱 상세하게는, 웜기어 부분에 발생하는 유격 및 이 유격 등에 기인한 래틀음을 저감함과 동시에 조립성을 개선할 수 있도록 한 전동 파워스티어링 장치에 관련한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power steering apparatus having a worm gear preload mechanism. More particularly, the present invention relates to an electric power steering system capable of reducing assembly lattices resulting from the worm gear portion and the lattices of the worm gear, and improving assembly performance. It is related to the steering device.
일반적으로, 차량에는 조향상태의 안정성을 보장하기 위해 파워 스티어링 시스템이 적용되는바, 이와 같은 파워 스티어링 장치는 기존에는 유압을 이용한 유압식 파워 스티어링 장치(HPS; Hydraulic Power Steering System)가 차량에 널리 이용되었으나, 최근에는 유압을 사용하던 기존의 방식과는 달리 모터의 회전력을 이용하여 운전자의 조향력을 쉽게 해주며, 환경친화적인 전동식 파워 스티어링 장치(EPS, Electrical Power Steering System)의 설치가 증가되는 추세이다.In general, the power steering system is applied to the vehicle to ensure the stability of the steering state. Such a power steering device has been widely used in the vehicle, a hydraulic power steering system (HPS) using hydraulic pressure. In recent years, unlike the conventional method of using hydraulic pressure, the steering power of the driver is easily made by using the rotational force of the motor, and the installation of an environmentally friendly electric power steering system (EPS) is increasing.
전동식 파워 스티어링 장치는, 차속센서 및 조향토크센서 등에서 감지한 차량의 운행조건에 따라 ECU에서 모터를 구동시켜 저속 운행시에는 가볍고 편안한 조향감을 부여하고, 고속 운행시에는 무거운 조향감과 더불어 양호한 방향 안정성을 부여하며, 비상 상황에서는 급속한 조향이 이루어지도록 하여 운전자에게 최적의 조향 조건을 제공하게 된다.The electric power steering system drives the motor in the ECU according to the vehicle's driving conditions detected by the vehicle speed sensor and the steering torque sensor to give a light and comfortable steering feeling at low speeds, and provides a good steering stability at high speeds. In the emergency situation, the steering is performed quickly to provide the driver with optimal steering conditions.
한편, 이와 같은 전동식 파워 스티어링 장치는 그 설치상태에 따라 칼럼타입(C-EPS)과, 피니언 타입(P-EPS) 및 랙 타입(R-EPS)으로 세분된다.On the other hand, such electric power steering device is subdivided into column type (C-EPS), pinion type (P-EPS) and rack type (R-EPS) according to the installation state.
전동식 파워 스티어링 장치 중 랙 타입(R-EPS) 스티어링 장치는, 랙 하우징 일측에 둔각 또는 예각의 기울기를 지니며 설치된 전동 모터의 피니언 기어가 랙바 일측 외주부를 지지하고 있는 볼 너트의 종동기어와 치합된 상태에서 전동모터의 구동력에 의해 볼 너트를 회전시키게 되고, 이 회전력에 의해 랙바를 좌우 슬라이딩시킴으로써, 핸들 조타에 따른 조력(助力)이 발생되도록 하는 것이다.The rack-type (R-EPS) steering system of the electric power steering system has an obtuse or acute inclination at one side of the rack housing, and the pinion gear of the electric motor installed is engaged with the driven gear of the ball nut supporting the outer peripheral part of the rack bar. In this state, the ball nut is rotated by the driving force of the electric motor, and the rack bar is slid left and right by this rotational force, so that an assist force due to steering of the handle is generated.
통상, 전동 파워 스티어링 장치의 웜기어 감속기구에서는, 웜과 웜기어의 각각의 맞물림 반경을 포함한 축거리에 대하여, 하우징의 기어 수납측과 구동모터의 출력축과의 축거리가 동거리로 설정되어 있다.Usually, in the worm gear reduction mechanism of the electric power steering apparatus, the axial distance between the gear accommodating side of the housing and the output shaft of the drive motor is set to the same distance with respect to the axial distance including the engagement radius of each of the worm and the worm gear.
이 때문에, 설정 백래시에 더하여 각각의 가공상 불균일 등에 기인하는 추가 백래시가 종종 발생하게 된다.For this reason, in addition to setting backlash, the additional backlash often arises due to each processing nonuniformity.
이러한 추가적인 백래시는, 차량이 악로를 주행하는 때, 이로인한 래틀음에 의한 불쾌감을 운전자에게 부여하는 등 신뢰성이나 기술적 레벨을 손상시키는 주요인으로 작용하고 있다.Such additional backlash acts as a major factor that impairs reliability and technical level, such as imparting discomfort to the driver due to the rattle sound when the vehicle travels in a bad lane.
이에 대한 대책으로서, 기어의 정밀도를 높여, 백래시를 아주 작게 설정하거나, 또는 웜과 그 축받침용 베어링 사이에 탄성체 등을 설치하여 진동을 흡수하는 등의 방법이 채용되고 있는 실정이다.As a countermeasure against this, a method of increasing the precision of the gear, setting the backlash to a very small size, or providing an elastic body or the like between the worm and the bearing for supporting the bearing to absorb vibration is employed.
이처럼 종래에는, 기어의 마모 등에 의하여 웜과 웜기어의 축심 사이 거리가 변동할 경우, 웜의 미소 변위에 의하여 예압력이 변화되어, 안정적인 예압력을 확보하는 것이 곤란하게 되는 등의 단점을 내포하고 있었다.As described above, when the distance between the worm and the shaft center of the worm gear fluctuates due to the wear of the gear, the preload is changed due to the micro displacement of the worm, and it is difficult to ensure stable preload. .
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 상술한 종래 기술 상의 단점을 해소하고, 백래시를 억제하고, 또 보조 조타력의 전달 성능을 훼손시키지 않고, 스플라인 접합부에서 발생하는 래틀음을 저감할 수 있는 간단 구성의 전동 파워스티어링 장치를 제공함을 주된 기술적 해결과제로 하고 있다.The present invention has been made to solve the above problems, the object of the present invention is to solve the above-mentioned disadvantages of the prior art, to suppress the backlash, and without impairing the transmission performance of the auxiliary steering force, at the spline joint The main technical problem is to provide an electric power steering apparatus having a simple configuration that can reduce the generated rattle sound.
또한, 부가적으로, 종래의 복잡한 구성의 토크 센서와 입출력토크축 사이의 결합구조에 따른 신뢰성 저하를 방지하고자, 본 발명에서는, 출력축을 이루는 입력토크축과 출력토크축의 토크를 감지하는 토크 센서와 입력토크축과 출력토크축 사이의 슬라이딩 및 심플한 구성의 연결구조를 통해, 조립성과 토크 감지에 대한 감지능을 대폭적으로 향상시킬 수 있게 되어, 전체적인 신뢰성 향상에 조력함을 해결과제로 하고 있다.In addition, in order to prevent reliability deterioration due to the coupling structure between the conventional torque sensor and the input / output torque shaft, in the present invention, a torque sensor for detecting the torque of the input torque shaft and the output torque shaft constituting the output shaft; The sliding structure between the input torque shaft and the output torque shaft and the simple structure make it possible to significantly improve the assembly and torque sensing capability, and to help improve overall reliability.
상기와 같은 목적을 달성하기 위하여, 본 발명은In order to achieve the above object, the present invention
구동모터의 보조 조타력을 웜기어를 이용하여 출력축에 전달하는 전동 파워스티어링 장치에 있어서,In the electric power steering device for transmitting the auxiliary steering force of the drive motor to the output shaft using a worm gear,
구동모터와 대향하는 측의 베어링은 이 베어링의 외주면을 감싸는 베어링 지지부재에 의해 둘러싸이며,The bearing on the side opposite to the drive motor is surrounded by a bearing support member surrounding the outer circumferential surface of the bearing,
베어링 지지부재의 외주면에 형성된 환상홈에 탄력성 링부재가 결합되고,The elastic ring member is coupled to the annular groove formed on the outer circumferential surface of the bearing support member,
탄력성 링부재와 베어링의 외주면 사이에는, 베어링 지지부재의 외주면 일측에 형성된 관통공을 통해, 구형체가 맞접촉하도록 구성된 것을 특징으로 한다.Between the elastic ring member and the outer circumferential surface of the bearing, through the through-hole formed on one side of the outer circumferential surface of the bearing support member, characterized in that the spherical body is configured to be in contact.
또한, 본 발명에서, 구형체는 댐퍼링 특성을 갖는 고무, 우레탄, 탄소유리섬유, 엔지니어링 플라스틱으로부터 선택되어 채용됨이 바람직하다.In addition, in the present invention, the spherical body is preferably selected from the rubber, urethane, carbon glass fiber, engineering plastics having damping properties are employed.
또, 관통공은 구형체가 외주면을 따라 설정거리 이동 가능하도록 외주방향으로 길게 형성된 슬롯이 채용되어도 좋다.Further, the through hole may be a slot formed long in the outer circumferential direction so that the spherical body can move the set distance along the outer circumferential surface.
또한, 본 발명은, 하우징에 장착되고 보조 조타 구동력을 발생하는 구동모터와, 하우징에 설치되는 모터측 외곽측베어링에 의해 지지되고, 구동모터의 축에 스플라인 결합되는 회전축과, 하우징의 소정위치에 축지지되고 조타력을 전달하기 위한 출력축과, 회전축에 일체로 형성되는 웜과 웜과 상호 맞물림 결합되도록 웜기어로 이루어진 감속기구를 포함하여, 구동모터의 보조 조타력을 웜기어를 이용하여 출력축에 전달하는 전동 파워스티어링 장치에 있어서, 출력축은 중앙에 토크 센서를 사이에 두고, 동축적으로 일체로 결합된 입력토크축과 출력토크축으로 이루어지고, 입력토크축과 출력토크축에 마주하는 일측 외주면에는, 토크 센서의 입력 로터와 출력 로터에 각각 연결된 입력토크축과 출력토크축의 토크를 측정하여 ECU로 전송하도록, 입력 로터측의 입력체결돌기와 출력 로터측의 출력체결돌기에 각각 계합되는, 입력계합구와 출력계합구가 각각 오목 형성된 것을 특징으로 한다.In addition, the present invention, the drive motor is mounted to the housing and generates an auxiliary steering drive force, the rotary shaft is supported by the motor side outer bearing installed in the housing, splined to the shaft of the drive motor, and the predetermined position of the housing It includes an output shaft for supporting shaft and transmitting steering force, and a reduction gear composed of a worm and a worm gear that are integrally coupled to the worm, which is integrally formed on the rotating shaft, to transmit the auxiliary steering force of the driving motor to the output shaft by using the worm gear. In the electric power steering apparatus, the output shaft is composed of an input torque shaft and an output torque shaft coaxially integrated integrally with a torque sensor in the center, and on one outer peripheral surface facing the input torque shaft and the output torque shaft, Input the torque of the input and output torque shafts connected to the input and output rotors of the torque sensor to be measured and transmitted to the ECU. And an input engagement hole and an output engagement hole respectively engaged with the input engagement protrusion on the rotor side and the output engagement protrusion on the rotor side, respectively.
본 발명에 따르면, 전동모터의 구동에 의해 차량의 조향력을 조력하여 운전자의 조타동작을 보조하는 전동 파워스티어링 장치에서, 웜측 회전축에 유격보상수단의 일환으로서 베어링의 외주면을 일방향 가압 가능한 구형체와 탄력성 링부재를 마련함으로써, 웜축 마모로 인해 유발되는 유격을 보상하며, 래틀음 등 소음을 저감시킬 수 있는 등의 매우 뛰어난 효과가 있는 것이다.According to the present invention, in an electric power steering apparatus that assists a driver's steering operation by assisting a steering force of a vehicle by driving an electric motor, a spherical body and elasticity capable of one-way pressing the outer circumferential surface of a bearing as a part of a clearance compensation means on a worm side rotation shaft By providing the ring member, it is possible to compensate for the play caused by the wear of the worm shaft, and to have a very excellent effect of reducing noise such as rattle sound.
도 1은 본 발명의 일 실시예에 따른 전동 파워스티어링 장치를 나타내는 사시 구조도,1 is a perspective structural diagram showing an electric power steering apparatus according to an embodiment of the present invention;
도 2는 도 1의 전동 파워스티어링 장치의 정면 구조도,2 is a front structural diagram of the electric power steering apparatus of FIG. 1;
도 3은 도 1의 선 A-A에 따른 종단면 구조도,3 is a longitudinal cross-sectional view taken along the line A-A of FIG.
도 4는 도 1의 선 A-A에 따라 일부 절취하여 나타낸 단면 구조도,4 is a cross-sectional structural view partially cut along the line A-A of FIG.
도 5는 도 4에서 출력축을 제외한 회전축과 이 회전축을 지지하는 지지요소들만 나타낸 분해사시 구조도,FIG. 5 is an exploded perspective structural view showing only a rotating shaft excluding an output shaft and supporting elements supporting the rotating shaft in FIG. 4;
도 6은 도 1의 선 B-B에 따른 종단면 구조도,6 is a longitudinal cross-sectional view taken along the line B-B of FIG.
도 7은 도 6의 C 부분을 확대하여 도시한 확대 단면 구조도,7 is an enlarged cross-sectional structural view showing an enlarged portion C of FIG.
도 8은 도 1 및 도 6에서의 내부 구성요소들을 분해하여 도시한 분해조립 사시도,8 is an exploded perspective view illustrating an exploded view of the internal components of FIGS. 1 and 6;
도 9는 도 8에서 구성요소들을 합체하여 도시한 합체 사시 구조도,FIG. 9 is a perspective illustration of the coalescing perspective of the components in FIG.
도 10은 도 9의 선 D-D에 따른 종단면 구조도,10 is a longitudinal cross-sectional view taken along the line D-D of FIG. 9;
도 11은 도 10에서 쿠일 샤트프의 출력토크부재와 입력토크부재 만을 나타낸 종단면 구조도,FIG. 11 is a vertical cross-sectional view illustrating only the output torque member and the input torque member of the coil shaft in FIG. 10;
도 12는 도 9에서 쿠일 샤프트 출력토크부재와 입력토크부재 만을 나타낸 조립 사시도.12 is an assembled perspective view showing only the coil shaft output torque member and the input torque member in FIG.
이하, 본 발명인 전동 파워스티어링 장치의 구성을 구체적으로 살펴보면 다음과 같다. 그리고, 본 발명을 설명함에 있어, 관련된 공지기능 혹은 구성에 대한 구체적인 설명은 본 발명의 요지를 모호하지 않게 하기 위하여 생략한다.Hereinafter, the configuration of the electric power steering apparatus of the present invention will be described in detail. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.
본 발명에서 사용되는 전동 파워스티어링 장치란 용어는, 하우징(10)에 장착되고 보조 조타 구동력을 발생하는 구동모터(M)와, 하우징(10)에 설치되는 모터측 및 외곽측 베어링(20, 30)에 의해 지지되고, 구동모터(M)의 모터축에 스플라인 결합되는 회전축(40)과, 하우징(10)의 소정위치에 축지지되고 조타력을 전달하기 위한 출력축(50)과, 회전축(40)에 일체로 형성되는 웜(41)과 웜(41)과 상호 맞물림 결합되도록 웜기어(43)로 이루어진 감속기구를 포함하여, 구동모터(M)의 보조 조타력을 웜기어(43)를 이용하여 출력축(50)에 전달하도록 구성된 하나의 모듈을 의미한다.The term electric power steering apparatus used in the present invention, the drive motor (M) is mounted to the housing 10 and generates an auxiliary steering drive force, and the motor side and outer side bearings 20 and 30 installed in the housing 10 Rotation shaft 40, which is supported by the drive shaft, and is splined to the motor shaft of the drive motor M, an output shaft 50 for being axially supported at a predetermined position of the housing 10, and transmitting a steering force, and the rotation shaft 40 Including a reduction gear consisting of a worm 41 and a worm gear 43 to be engaged with the worm 41 and integrally formed on the), the auxiliary steering force of the drive motor (M) using the worm gear 43 Means one module configured to pass on 50.
도 1은 본 발명의 일 실시예에 따른 전동 파워스티어링 장치의 전체 구성을 나타낸 사시 구조도이다.1 is a perspective structural diagram showing the overall configuration of an electric power steering apparatus according to an embodiment of the present invention.
전동 파워스티어링 장치는, 구동모터(M)와 대향하는 외곽측의 베어링(30)은 이 외곽측 베어링(30)의 외주면을 감싸는 베어링 지지부재(60)에 의해 둘러싸인 구성으로 되어 있다.In the electric power steering apparatus, the outer bearing 30 facing the drive motor M is configured to be surrounded by a bearing support member 60 surrounding the outer circumferential surface of the outer bearing 30.
또, 베어링 지지부재(60)의 외주면에 형성된 환상홈(61)에 일측이 개방된 탄력성 링부재(70)가 결합되어 있다.In addition, the elastic ring member 70 having one side open is coupled to the annular groove 61 formed on the outer circumferential surface of the bearing support member 60.
또한, 탄력성 링부재(70)와 외곽측 베어링(30)의 외주면 사이에는, 베어링 지지부재(60)의 환상홈(61)의 외주 일측에 형성된 관통공(61a)을 통해, 구형체(80)가 맞접촉하도록 구성되어 있다.In addition, the spherical body 80 is formed between the elastic ring member 70 and the outer circumferential surface of the outer bearing 30 through a through hole 61a formed on the outer circumferential side of the annular groove 61 of the bearing support member 60. Is configured to contact.
또한, 구형체(80)는 댐퍼링 특성을 갖는 고무, 우레탄, 탄소유리섬유, 엔지니어링 플라스틱으로부터 선택된다.Further, the spherical body 80 is selected from rubber, urethane, carbon glass fiber, and engineering plastic having damping properties.
또, 관통공(61a)은 구형체(80)가 외주면을 따라 설정거리 이동 가능하도록 외주면을 따르는 방향으로 길게 형성된 슬롯으로 형성되는 구조를 채택해도 좋다.In addition, the through hole 61a may adopt a structure in which the spherical body 80 is formed as a slot elongated in the direction along the outer circumferential surface such that the spherical body 80 can move a set distance along the outer circumferential surface.
한편, 출력축(50)은 중앙에 토크 센서(100)를 사이에 두고, 동축적으로 일체로 결합된 입력토크축(51)과 출력토크축(53)으로 이루어져 있다.On the other hand, the output shaft 50 is composed of an input torque shaft 51 and an output torque shaft 53 coupled coaxially integrally with a torque sensor 100 in the center.
입력토크축(51)과 출력토크축(53)에 마주하는 일측 외주면에는, 토크 센서(100)의 입력 로터와 출력 로터에 각각 연결된 입력토크축(51)과 출력토크축(53)의 토크를 측정하여 ECU로 전송하도록, 입력 로터측의 입력체결돌기(101)와 출력 로터측의 출력체결돌기(103)에 각각 계합되는, 입력계합구(51a)와 출력계합구(53a)가 각각 오목 형성되어 있다.On one outer circumferential surface facing the input torque shaft 51 and the output torque shaft 53, torque of the input torque shaft 51 and the output torque shaft 53 connected to the input rotor and the output rotor of the torque sensor 100, respectively, is applied. The input engagement hole 51a and the output engagement hole 53a respectively engaged with the input fastening protrusion 101 on the input rotor side and the output fastening protrusion 103 on the output rotor side are respectively formed to measure and transmit to the ECU. It is.
또한, 입력계합구(51a)는 입력토크축(51)의 절반부에 대응하는 위치까지 연속하여 형성되어 있다. 이 때문에, 기존에 토크센서(100)와 출력토크축(53)을 합체한 상태에서 하우징(10) 내부에 장착해야만 하는 조립 상의 단점을 해소할 수 있게 된다. 즉, 입력계합구(51a)가 입력토크축(51)의 절반부인 후육부 전체에 걸쳐 오목형성되어 있기 때문에, 토크센서(100)에 대하여 일체로 조립된 상태가 아닌, 사후에 조립하더라도 단번에 밀어넣어 조립시킬 수 있는 구성을 달성할 수 있게 되는 것이다.In addition, the input engagement port 51a is formed continuously to the position corresponding to half of the input torque shaft 51. Because of this, it is possible to solve the assembly disadvantage that must be mounted inside the housing 10 in the state in which the torque sensor 100 and the output torque shaft 53 is combined. That is, since the input engagement hole 51a is recessed over the entire thick portion, which is half of the input torque shaft 51, the input engagement port 51a is pushed at once even if it is assembled after the fact, instead of being assembled integrally with the torque sensor 100. It will be possible to achieve a configuration that can be put into assembly.
다시 말해서, 기존 방법에서는 토크센서(100)가 조립된 상태에서 쿠일 샤프트 고정을 위한 핀용 홀 가공을 위한 드릴링으로 인해 토크센서(100)의 손상이나 절삭유, 절삭칩 등의 이물질이 유입될 위험이 있으나, 본원 발명에서는, 쿠일 샤프트의 조립 후 (핀 압입까지 완료된 모든 가공공정이 끝난 상태에서), 토크센서(100)를 입력토크축(51) 한쪽 측면에서 투입시키는 것으로 간이하게 조립 완료할 수 있게 됨으로써, 이물질 유입상의 저위험도 및 조립성을 가 한층 복합적으로 개선시킬 수 있게 되는 것이다.In other words, in the conventional method, there is a risk of damage to the torque sensor 100 or foreign substances such as cutting oil and cutting chips due to drilling for pin holes for fixing the coil shaft while the torque sensor 100 is assembled. In the present invention, after assembling the coil shaft (in the state in which all the processing steps completed until the pin press-in is finished), the torque sensor 100 can be easily assembled by injecting the torque sensor 100 from one side of the input torque shaft 51. In addition, the low risk of inflow of foreign substances and the assemblability can be further improved.
또, 출력 로터의 중앙에는 출력체결돌기(103)가 형성되어 있어서 출력로터측의 출력체결돌기(103)에 출력토크축(53)의 출력계합구(53a)가 압입 고정되는 구조로 되어 있다.In addition, an output fastening protrusion 103 is formed in the center of the output rotor, and the output engagement hole 53a of the output torque shaft 53 is press-fitted to the output fastening protrusion 103 on the output rotor side.
또한, 입력 로터의 중앙에는 입력로터측의 입력체결돌기(101)가 형성되어 있어서 입력로터측의 입력체결돌기(101)에 입력토크축(51)의 입력계합구(51a)를 삽입 고정시키는 구조로 되어 있다.In addition, an input fastening protrusion 101 on the input rotor side is formed at the center of the input rotor to insert and fix the input engaging holes 51a of the input torque shaft 51 to the input fastening protrusion 101 on the input rotor side. It is.
웜기어(43)의 일측에는 이 웜기어(43)와 출력토크축(53)으로 연결되는 토크 센서(100)가 장착되어 있다.One side of the worm gear 43 is equipped with a torque sensor 100 connected to the worm gear 43 and the output torque shaft 53.
토크 센서(100)는 입력토크축(51)과 출력토크축(53)의 토크를 측정하여 ECU로 전송하고 이에 따라 ECU에서 구동 모터를 작동시켜 조향 보조력을 제공하게 된다.The torque sensor 100 measures the torque of the input torque shaft 51 and the output torque shaft 53 and transmits the torque to the ECU, thereby operating the driving motor in the ECU to provide steering assistance.
토크 센서(100)는 출력 로터(도시하지 않음), 입력 로터(도시하지 않음) 및, 커버(100a)를 포함하여 구성되고, 출력 로터의 중앙에는 출력로터측의 출력체결돌기(103)가 형성되어 있어서 출력로터측의 출력체결돌기(103)에 출력토크축(53)이 압입 고정된다.The torque sensor 100 includes an output rotor (not shown), an input rotor (not shown), and a cover 100a, and an output fastener 103 on the output rotor side is formed at the center of the output rotor. The output torque shaft 53 is press-fitted to the output fastening protrusion 103 on the output rotor side.
또한, 입력 로터의 중앙에는 입력토크축(51)에 결합되도록 입력체결돌기(101)가 연결형성되어 있어서 입력토크축(51) 입력체결돌기(101)에 입력토크축(51)을 삽입 고정시키는 구조로 되어 있다.In addition, the input fastening protrusion 101 is connected to the input torque shaft 51 at the center of the input rotor to connect the input torque shaft 51 to the input torque shaft 51 and the input fastening protrusion 101. It is structured.
커버(100a)는 출력 로터와 입력 로터를 감싸게 되는데, 커버는 출력 로터와 입력 로터를 보호하면서 출력 로터와 입력 로터를 전자 제어 유닛(Electronic Control Unit, 일명, 'ECU')에 연결해 주는 역할을 하게 된다.The cover 100a encloses the output rotor and the input rotor, and the cover protects the output rotor and the input rotor while connecting the output rotor and the input rotor to an electronic control unit (aka, 'ECU'). do.
또한, 웜기어(43)의 기어면 사이에는, 백래시(backlash)가 생길 것이므로, 맞물림부(meshing portion)에서 연속적인 기어 타격음(gear slapping sound)이 발생될 수 있다.In addition, since the backlash will occur between the gear surfaces of the worm gear 43, continuous gear slapping sound may be generated in the meshing portion.
또, 모터측 베어링(20)의 양단에는 모터측 베어링(20)의 내륜과 양단면부를 동시에 감싸도록 단면이 'ㅏ' 자 형상의 플랜지(46a, 47a)-구비 부시형 댐핑부재(46, 47)가 조립되어 있다.Further, at both ends of the motor side bearing 20, the flange 46a, 47a-equipped bush- type damping members 46, 47 having a cross-sectional shape of 'ㅏ' shape so as to surround the inner ring and the both end surfaces of the motor side bearing 20 at the same time. ) Is assembled.
한편, 미설명 부호(48, 49)는 부시형 댐핑부재(46, 47)의 최외측을 지지하는 스틸링으로서, 모터측 베어링(20) 양측에서 진동, 충격흡수 기능을 하는 댐핑부재(46, 47)의 양측에 고정 받침용으로 각각 착접되어 있다.On the other hand, reference numerals 48 and 49 are steel rings for supporting the outermost sides of the bushing damping members 46 and 47, and the damping members 46 having vibration and shock absorbing functions on both sides of the motor side bearing 20 are provided. 47) is fixed to both sides for fixing base.
또, 플랜지(46a, 47a)-구비 댐핑부재(46, 47)는 모터측 베어링(20)의 내륜과 양 외단면부에서 압축되어, 회전축(40)의 반경 방향의 변위에 대하여 전체 주위에 있어서 균일한 반발력을 발생한다. 이 때문에, 무 부하시에, 웜(41)이 형성된 회전축의 모터측 베어링(20)의 내륜에 대하여 플로팅(floating) 배열되고, 회전축(40)과 모터측 베어링(20)의 내륜은 서로 접촉하지 않는 상태를 유지하게 되는 것이다.In addition, the flanges 46a and 47a-the damping members 46 and 47 are compressed at the inner ring and both outer end portions of the motor-side bearing 20, so that the flanges 46a and 47a-the damping members 46 and 47 are all around the radial displacement of the rotating shaft 40. Generates uniform repulsive force. For this reason, when there is no load, it floats with respect to the inner ring of the motor side bearing 20 of the rotating shaft in which the worm 41 was formed, and the inner ring of the rotating shaft 40 and the motor side bearing 20 do not contact each other. It will remain in a state that does not.
또한, 웜 축 및 웜기어(43)를 조립할 때, 웜, 이를 지지하는 복수의 베어링(20, 30), 웜기어(43) 및 이를 지지하는 출력축 등의 치수 오차에 의해, 조립 후에 비교적 큰 비율로 백래시가 생기게 된다.In addition, when assembling the worm shaft and the worm gear 43, backlash is relatively large after assembly due to dimensional errors such as the worm, the plurality of bearings 20 and 30 supporting the worm gear, the worm gear 43 and the output shaft supporting the same. Will be generated.
이 때문에, 각 부품을 정밀도에 따라서 조립할 필요가 있어서, 조립이 매우 번잡하게 되는 것을 방지하도록, 하우징(10)에 설치되는 모터측 베어링(20)의 양단에 공통 구조의 플랜지-구비 댐핑부재(46, 47)를 각각 구비함으로써, 모터측 베어링(20)의 양단에 댐핑부재(46, 47)를 설치하고, 웜(41) 및 회전축(40)을 축방향 이동 가능하게 하고, 이로써 맞물림부의 충격을 완화하고, 기어 타격음을 방지하도록 구성되게 되는 것이다.For this reason, it is necessary to assemble each component according to the precision, and the flange-equipped damping member 46 of a common structure is provided at both ends of the motor side bearing 20 provided in the housing 10 so as to prevent the assembly from becoming very complicated. And 47, respectively, providing damping members 46 and 47 at both ends of the motor-side bearing 20, enabling the worm 41 and the rotational shaft 40 to be moved in the axial direction, thereby reducing the impact of the engaging portion. To mitigate and prevent gear strikes.
이에 따라, 노면으로의 입력 등에 의한 경부하가 웜(41)-구비 회전축(40)에 걸리면, 반경 방향의 하중이 발생하고, 회전축(40)이 변위되더라고, 댐핑부재(46, 47)에 의해 인가된 하중을 받기 때문에, 회전축(40)과 모터측 베어링(20)의 내륜(20a)이 직접 접촉하지 않고, 미소 간극에 따른 금속 타격음을 완전히 규제할 수 있게 되는 것이다.Accordingly, when the light load due to the input to the road surface is applied to the worm 41-the rotary shaft 40, a radial load is generated, and the rotary shaft 40 is displaced, but the damping members 46 and 47 are not affected. Because of the load applied, the rotating shaft 40 and the inner ring 20a of the motor-side bearing 20 do not directly contact each other, and the metal impact sound according to the micro clearance can be completely regulated.
또, 부가적으로 모터측 베어링(20) 양측에서 진동, 충격흡수 기능을 하는 댐핑부재(46, 47)는, 고무 또는 우레탄 재질로 이루어져 있다.In addition, the damping members 46 and 47 which have vibration and shock absorption functions on both sides of the motor side bearing 20 are made of rubber or urethane.
입력토크축(51)과 출력토크축(53)은 플라스틱재의 슬리브(90)에 의해 회전시 초기 마찰토크를 감소시키고 원할한 회전성능을 달성하도록, 슬리브(90)가 입력토크축(51)의 선단 외주부와 출력토크축(53)의 내주부 사이에 접속 결합됨으로써, 윤활유 사용없이 조립이 가능한 엔지니어링 플라스틱재질의 슬리브(90) 적용으로 회전 시 초기 마찰토크를 감소시키고 원할한 회전성능을 확보하여, 토크센서의 안정적인 출력성능을 달성할 수 있게 되는 것이다.The input torque shaft 51 and the output torque shaft 53 are formed by the sleeve 90 of the plastic material so that the sleeve 90 of the input torque shaft 51 can reduce the initial friction torque and achieve the desired rotational performance. By connecting and connecting between the outer circumference of the tip and the inner circumference of the output torque shaft 53, by applying the sleeve 90 of the engineering plastic material that can be assembled without the use of lubricating oil to reduce the initial friction torque during rotation and ensure a smooth rotational performance, Stable output performance of the torque sensor can be achieved.
이와 같이 구성됨에 따라, 본 발명에 따른 탄력성 링부재(70)는 웜(41)의 축 단부를 지지하는 외곽측 베어링(30)의 외주부를 감쌈과 동시에, 내적으로 베어링(30)의 외주면에 구형체(80)를 항시 착접시켜, 웜(41)의 축방향 및 반경방향 유격을 유연하게 흡수 또는 보상할 수 있게 되는 것이다.As such, the resilient ring member 70 according to the present invention while wrapping the outer peripheral portion of the outer bearing 30 for supporting the shaft end of the worm 41, at the same time spherical to the outer peripheral surface of the bearing 30 The sieve 80 is always brought into contact so that the axial and radial play of the worm 41 can be flexibly absorbed or compensated.
따라서, 상기와 같은 구성으로 이루어진 본 발명은, 차속센서 및 조향 토크센서(100) 등에서 감지한 차량의 운행조건에 따라 ECU에서 전동모터 구동명령을 산출하여 전동모터를 적정 회전수로 구동시키고, 이러한 전동모터의 회전력은 웜(41)과 웜기어(43)로 이루어진 감속기어를 거치면서 적정회전수로 감속된 상태로 스티어링 샤프트에 전달되어 운전자의 스티어링 휠 조타력을 어시스트(assist)하게 된다.Therefore, according to the present invention having the above configuration, the electric motor driving command is calculated by the ECU according to the driving conditions of the vehicle detected by the vehicle speed sensor and the steering torque sensor 100 to drive the electric motor at an appropriate rotational speed. The rotational force of the electric motor is transmitted to the steering shaft while being decelerated at an appropriate rotational speed while passing through a reduction gear including a worm 41 and a worm gear 43 to assist the steering wheel steering force of the driver.
이때, 본 발명에서는 감속기어인 웜(41)을 지지하는 외곽측 베어링(30)의 외주면을 감싸도록 위치고정된 탄력성 링부재(70) 및 구형체(80)가 제공됨으로써, 감속기어가 잦은 마찰로 인해 마모되었을 때, 유격이 발생하는 것을 극력 규제함으로써, 이로인해 기어치간에 불규칙한 접촉에 의한 래틀음을 포함한 소음(Lattle noise)을 극력 규제할 수 있게 되는 것이다.At this time, in the present invention, the elastic ring member 70 and the spherical body 80 is positioned to surround the outer circumferential surface of the outer bearing 30 supporting the worm 41, which is a reduction gear, thereby providing a reduction gear due to frequent friction. When worn out, by regulating the occurrence of play as much as possible, this makes it possible to regulate the maximum of the noise (rattle noise) including the rattle sound due to irregular contact between the gear teeth.
또한, 탄력성 링부재(70)와 구형체의 부가로 인해, 회전축(40)의 외곽부를 지지하는 측의 외곽측 베어링(30)에 예압을 부여함으로써, 항시 웜(41)과 웜기어(43)가 상호 접촉하게 됨으로써, 이 부분의 유격이 극력 규제되는 것이다.Further, due to the addition of the elastic ring member 70 and the spherical body, the preload is applied to the outer bearing 30 on the side supporting the outer portion of the rotating shaft 40, whereby the worm 41 and the worm gear 43 are always By coming into contact with each other, the play of this part is severely regulated.
또한, 출력축(50)을 이루는 입력토크축(51)과 출력토크축(53)의 토크를 감지하는 토크 센서(100)와 입력토크축(51)과 출력토크축(53) 사이의 간단한 구성의 연결구조를 통해, 조립성과 토크 감지에 대한 감지능을 대폭적으로 향상시킬 수 있게 되어, 전체적인 신뢰성 향상에 도움을 줄 수 있게 되었다.In addition, the torque sensor 100 for detecting the torque of the input torque shaft 51 and the output torque shaft 53 constituting the output shaft 50 and the input torque shaft 51 and the output torque shaft 53 of a simple configuration Through the connection structure, it is possible to greatly improve the assemblability and the sense of torque sensing, which can help to improve the overall reliability.
한편, 본 발명의 상세한 설명에서는 구체적인 실시 예에 관해서 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함을 당해 분야에서 통상의 지식을 가진 자에게 있어서 자명하다 할 것이다.Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.
이상에서 첨부된 도면을 참조하여 본 발명을 설명함에 있어 특정형상 및 방향을 위주로 설명하였으나, 본 발명은 당업자에 의하여 다양한 변형 및 변경이 가능하고, 이러한 변형 및 변경은 본 발명의 권리범위에 포함되는 것으로 해석되어야 한다.In the above description with reference to the accompanying drawings, the present invention has been described with reference to specific shapes and directions, but the present invention may be variously modified and changed by those skilled in the art, and such modifications and changes are included in the scope of the present invention. Should be interpreted as

Claims (7)

  1. 하우징에 장착되고 보조 조타 구동력을 발생하는 구동모터의 축에 스플라인 결합되는 회전축을 포함하여, 상기 구동모터의 보조 조타력을 상기 웜기어를 이용하여 출력축에 전달하는 전동 파워스티어링 장치에 있어서,In the electric power steering apparatus for transmitting the auxiliary steering force of the drive motor to the output shaft using the worm gear, including a rotating shaft mounted to the housing and splined to the shaft of the drive motor for generating an auxiliary steering drive force,
    상기 구동모터와 대향하는 측의 베어링은 이 베어링의 외주면을 감싸는 베어링 지지부재에 의해 둘러싸이며,The bearing on the side opposite to the drive motor is surrounded by a bearing support member surrounding the outer circumferential surface of the bearing,
    상기 베어링 지지부재의 외주면에 형성된 환상홈에 탄력성 링부재가 결합되고,The elastic ring member is coupled to the annular groove formed on the outer circumferential surface of the bearing support member,
    상기 탄력성 링부재와 상기 베어링의 외주면 사이에는, 상기 베어링 지지부재의 외주면 일측에 형성된 관통공을 통해, 구형체가 맞접촉하도록 구성된 것을 특징으로 하는 전동 파워스티어링 장치.An electric power steering apparatus between the elastic ring member and the outer circumferential surface of the bearing, the spherical body is in contact with the through hole formed on one side of the outer circumferential surface of the bearing support member.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 구형체는 스틸 볼 또는 댐퍼링 특성을 갖는 고무, 우레탄, 탄소유리섬유, 엔지니어링 플라스틱으로부터 선택되는 것을 특징으로 하는 전동 파워스티어링 장치.The spherical body is an electric power steering device, characterized in that selected from the steel ball or rubber having a damping property, urethane, carbon glass fiber, engineering plastics.
  3. 청구항 1 또는 청구항 2에 있어서,The method according to claim 1 or 2,
    상기 관통공은 상기 구형체가 외주면을 따라 설정거리 이동 가능하도록 외주방향으로 길게 형성된 슬롯인 것을 특징으로 하는 전동 파워스티어링 장치.The through hole is an electric power steering apparatus, characterized in that the slot is formed long in the circumferential direction so that the spherical body can move the set distance along the outer circumferential surface.
  4. 하우징에 장착되고 보조 조타 구동력을 발생하는 구동모터와,A drive motor mounted to the housing and generating auxiliary steering drive force;
    상기 하우징에 설치되는 모터 내외곽측 베어링에 의해 지지되고, 상기 구동모터의 축에 스플라인 결합되는 회전축과,A rotating shaft supported by the inner and outer bearings installed in the housing and splined to the shaft of the driving motor;
    상기 하우징의 소정위치에 축지지되고 조타력을 전달하기 위한 출력축과,An output shaft for being axially supported at a predetermined position of the housing and transmitting a steering force;
    상기 회전축에 일체로 형성되는 웜과 상기 웜과 상호 맞물림 결합되도록 상기 웜기어로 이루어진 감속기구를 포함하여, 상기 구동모터의 보조 조타력을 상기 웜기어를 이용하여 상기 출력축에 전달하는 전동 파워스티어링 장치에 있어서,In the electric power steering apparatus including a worm integrally formed on the rotary shaft and a reduction mechanism consisting of the worm gear to be engaged with the worm, and transmits the auxiliary steering force of the drive motor to the output shaft using the worm gear. ,
    상기 출력축은 중앙에 토크 센서를 사이에 두고, 동축적으로 일체로 결합된 입력토크축과 출력토크축으로 이루어지고,The output shaft is composed of an input torque shaft and an output torque shaft coupled coaxially integrally with a torque sensor in the center,
    상기 입력토크축과 출력토크축에 마주하는 일측 외주면에는, 상기 토크 센서의 입력 로터와 출력 로터에 각각 연결된 상기 입력토크축과 출력토크축의 토크를 측정하여 ECU로 전송하도록, 상기 입력 로터측의 입력체결돌기와 출력 로터측의 출력체결돌기에 각각 계합되는, 입력계합구와 출력계합구가 각각 오목 형성된 것을 특징으로 하는 전동 파워스티어링 장치.On one side outer circumferential surface facing the input torque shaft and output torque shaft, the input of the input rotor side to measure and transmit the torque of the input torque shaft and output torque shaft connected to the input rotor and output rotor of the torque sensor, respectively, to the ECU. An electric power steering apparatus characterized in that the input engaging holes and the output engaging holes are respectively concave, which are respectively engaged with the fastening protrusions and the output fastening protrusions on the output rotor side.
  5. 청구항 4에 있어서,The method according to claim 4,
    상기 입력토크축과 출력토크축은 플라스틱재의 슬리브에 의해 회전시 초기 마찰토크를 감소시키고 원할한 회전성능을 달성하도록, 상기 슬리브가 상기 입력토크축의 선단 외주부와 상기 출력토크축의 내주부 사이에 접속 결합된 것을 특지으로 하는 전동 파워 스티어링 장치.The input torque shaft and the output torque shaft are connected and coupled between the tip outer circumference of the input torque shaft and the inner circumference of the output torque shaft so as to reduce initial friction torque when rotating by the sleeve made of plastic and achieve a desired rotational performance. The electric power steering apparatus which features a thing.
  6. 청구항 1에 있어서,The method according to claim 1,
    상기 모터측 베어링의 양측에는, 상기 웜이 형성된 회전축의 모터측 베어링의 내륜에 대하여 플로팅(floating) 배열되고, 상기 회전축과 상기 모터측 베어링의 내륜이 서로 접촉하지 않는 상태를 유지하도록, 공통 구조의 플랜지-구비 댐핑부재가 끼움 결합된 것을 특징으로 하는 전동 파워스티어링 장치.Both sides of the motor-side bearing are arranged floating with respect to the inner ring of the motor-side bearing of the rotating shaft on which the worm is formed, so that the rotating shaft and the inner ring of the motor-side bearing are kept in contact with each other. An electric power steering apparatus, characterized in that the flange-equipped damping member is fitted.
  7. 청구항 6에 있어서,The method according to claim 6,
    상기 모터측 베어링 양측에서 진동, 충격흡수 기능을 하는 댐핑부재의 양측에는 고정 받침용 스틸링이 각각 착접된 것을 특징으로 하는 전동 파워스티어링 장치.Both sides of the damping member for the vibration and shock absorbing function on both sides of the motor-side bearing, the fixed bearing steel ring is characterized in that each of the electric power steering device.
PCT/KR2010/008288 2010-04-12 2010-11-23 Electrical power-steering apparatus WO2011129509A1 (en)

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KR20100033238A KR101204306B1 (en) 2010-04-12 2010-04-12 Electric power steering device
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