KR102251325B1 - Power take-off unit for 4 wheel driving vehicle - Google Patents

Power take-off unit for 4 wheel driving vehicle Download PDF

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Publication number
KR102251325B1
KR102251325B1 KR1020160079173A KR20160079173A KR102251325B1 KR 102251325 B1 KR102251325 B1 KR 102251325B1 KR 1020160079173 A KR1020160079173 A KR 1020160079173A KR 20160079173 A KR20160079173 A KR 20160079173A KR 102251325 B1 KR102251325 B1 KR 102251325B1
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South Korea
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coil spring
wheel drive
lead screw
transmission
removing means
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KR1020160079173A
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Korean (ko)
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KR20180000905A (en
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정연석
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현대위아(주)
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/344—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
    • F16F3/04—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction composed only of wound springs
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/82—Four wheel drive systems
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H2061/0474—Smoothing ratio shift by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches
    • 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
    • F16H2300/00—Determining of new ratio
    • F16H2300/14—Selecting a state of operation, e.g. depending on two wheel or four wheel drive mode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

2륜구동에서 4륜구동으로의 절환시, 엔진 및 변속기로부터 전달되는 동력을 추진축을 통해 후륜으로 전달하는 4륜구동 차량의 부변속기에 있어서, 변속기의 동력이 입력되는 입력축; 상기 입력축으로부터 동력을 전달받는 출력축; 및 상기 입력축과 출력축 사이에 구비되어, 상기 입력축의 동력을 상기 출력축으로 전달하되, 입출력 속도 차이에서 발생되는 충격을 제거하기 위한 충격제거수단이 구비된 절환수단;을 포함하는 4륜구동 차량용 부변속기가 소개된다.A secondary transmission of a four-wheel drive vehicle that transmits power transmitted from an engine and a transmission to a rear wheel through a propulsion shaft when switching from two-wheel drive to four-wheel drive, comprising: an input shaft to which the power of the transmission is input; An output shaft receiving power from the input shaft; And a switching means provided between the input shaft and the output shaft to transmit the power of the input shaft to the output shaft, and having a shock removing means for removing an impact generated from a difference in input/output speed; Is introduced.

Description

4륜구동 차량용 부변속기 {POWER TAKE-OFF UNIT FOR 4 WHEEL DRIVING VEHICLE}Auxiliary transmission for 4 wheel drive vehicles {POWER TAKE-OFF UNIT FOR 4 WHEEL DRIVING VEHICLE}

본 발명은 2륜구동모드에서 4륜구동모드로의 절환시, 입출력 속도차에 의한 충격 발생으로 절환장치 액추에이터의 손상을 방지하기 위한 4륜구동 차량용 부변속기에 관한 것이다.The present invention relates to an auxiliary transmission for a four-wheel drive vehicle for preventing damage to a switching device actuator due to an impact caused by an input/output speed difference when switching from a two-wheel drive mode to a four-wheel drive mode.

통상적으로, 2륜 구동차량은 엔진, 변속기의 장착위치와 실제 구동륜의 위치에 따라 FR(Front engine Rear drive) 형식 또는 FF(Front engine Front drive) 형식으로 구분된다.Typically, a two-wheel drive vehicle is classified into a front engine rear drive (FR) type or a front engine front drive (FF) type according to an engine and transmission mounting position and an actual driving wheel position.

2륜 구동차량이 주행을 하는 경우에 필요로 하게 되는 구동력은 승객과 화물을 실은 상태에서 도로상황 및 주행속도 등에 의해 크게 변화하므로 이에 대응하기 위해서 엔진과 구동바퀴 사이에서 토크를 변화시키는 장치를 필요로 하는데, 이와 같이 토크를 변화시키는 장치를 변속기라고 하며, 상기한 변속기는 수동변속기(manual transmission)와 자동변속기(automatic transmission)로 나눌 수 있다.Since the driving force required when a two-wheel drive vehicle is running varies greatly depending on road conditions and driving speed, etc. in the state where passengers and cargo are loaded, a device that changes the torque between the engine and the driving wheel is required to cope with this. In this way, a device for changing torque is called a transmission, and the transmission can be divided into a manual transmission and an automatic transmission.

상기한 수동변속기와 자동변속기를 포함하는 변속기는 일반적으로 1단, 2단, 3단, 4단, 5단, 후진단의 6개단의 변속을 할 수 있도록 구성되는데, 4륜구동(4 Wheel Drive, 4WD) 차량에서는 이와 같은 6개단의 변속을 위한 구성이외에 4륜 구동을 위한 부변속기가 추가로 설치되는 구조로 이루어진다.The transmission including the above-described manual transmission and automatic transmission is generally configured to be capable of shifting in 6 gears of 1st, 2nd, 3rd, 4th, 5th, and reverse gear. In the 4WD) vehicle, in addition to the configuration for shifting in six stages, a secondary transmission for four-wheel drive is additionally installed.

도 6은 통상적인 4륜구동 차량용 부변속기가 장착된 차량을 간략하게 도시한 블록도이다. 상기 도면을 통해 동력의 흐름을 살펴보면, 동력을 발생시키기 위한 엔진(100)과 상기 엔진(100)의 동력을 전륜(800)과 후륜(400)으로 전달하는 변속기(200)가 마련된다. 상기 변속기(200)에는 입력축(500), 절환수단(900) 및 출력축(600)으로 구성된 부변속기(1000)가 구비되어, 상기 변속기(200) 통해 입력된 동력을 상기 부변속기(1000)의 입력축(500)을 통해 상기 출력축(600)으로 전달하고, 상기 출력축(600)으로 전달된 동력은 출력축(600)과 90도로 결합된 피니언기어(700)를 통해 추진축(300)을 거쳐 후륜(400)으로 전달되는 것이다.6 is a block diagram schematically showing a vehicle equipped with an auxiliary transmission for a conventional four-wheel drive vehicle. Looking at the flow of power through the drawing, an engine 100 for generating power and a transmission 200 for transmitting the power of the engine 100 to the front wheels 800 and the rear wheels 400 are provided. The transmission 200 is provided with a sub transmission 1000 consisting of an input shaft 500, a switching means 900, and an output shaft 600, so that the power input through the transmission 200 is transferred to the input shaft of the auxiliary transmission 1000. The power is transmitted to the output shaft 600 through 500, and the power transmitted to the output shaft 600 passes through the propulsion shaft 300 through the pinion gear 700 coupled to the output shaft 600 at 90 degrees, and the rear wheel 400 is It is delivered as.

그러나 종래의 경우, 2륜구동모드에서 4륜구동모드로의 절환시 상기 부변속기(1000)를 통해 동력이 후륜(400)으로 전달되게 하는데, 입출력 속도의 차이에 의해 충격이 발생(블로킹, Blocking)되어 절환수단(900)내 액추에이터(950)의 손상이 발생되는 문제가 발생되었다.However, in the conventional case, when switching from the two-wheel drive mode to the four-wheel drive mode, the power is transmitted to the rear wheel 400 through the auxiliary transmission 1000, and an impact is generated (blocking, blocking) due to the difference in input/output speed. There has been a problem that damage to the actuator 950 in the switching means 900 occurs.

상기의 배경기술로서 설명된 사항들은 본 발명의 배경에 대한 이해 증진을 위한 것일 뿐, 이 기술분야에서 통상의 지식을 가진자에게 이미 알려진 종래기술에 해당함을 인정하는 것으로 받아들여져서는 안 될 것이다.The matters described as the background art are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KRKR 20-028704220-0287042 Y1Y1

본 발명은 이러한 문제점을 해결하기 위하여 제안된 것으로, 2륜구동모드에서 4륜구동모드로의 절환시 입출력 속도차에 의한 충격이 발생되지 않도록 하면서도, 충분한 절환력을 확보할 수 있는 4륜구동 차량용 부변속기를 제공하는데 그 목적이 있다.The present invention has been proposed to solve this problem, and a sub transmission for a four-wheel drive vehicle capable of securing sufficient switching power while preventing an impact due to an input/output speed difference when switching from a two-wheel drive mode to a four-wheel drive mode is generated. It has its purpose to provide.

상기의 목적을 달성하기 위한 본 발명에 따른 4륜구동 차량용 부변속기는 2륜구동에서 4륜구동으로의 절환시, 엔진 및 변속기로부터 전달되는 동력을 추진축을 통해 후륜으로 전달하는 4륜구동 차량의 부변속기에 있어서, 변속기의 동력이 입력되는 입력축; 상기 입력축으로부터 동력을 전달받는 출력축; 및 상기 입력축과 출력축 사이에 구비되어, 상기 입력축의 동력을 상기 출력축으로 전달하되, 입출력 속도 차이에서 발생되는 충격을 제거하기 위한 충격제거수단이 구비된 절환수단;을 포함한다.The auxiliary transmission for a four-wheel drive vehicle according to the present invention for achieving the above object is a sub transmission of a four-wheel drive vehicle that transmits power transmitted from the engine and transmission to the rear wheel through a propulsion shaft when switching from two-wheel drive to four-wheel drive. , An input shaft into which power of the transmission is input; An output shaft receiving power from the input shaft; And a switching means provided between the input shaft and the output shaft, transmitting the power of the input shaft to the output shaft, and having a shock removing means for removing an impact generated from a difference in input/output speed.

상기 절환수단은, 상기 입력축에 마련된 슬리브; 상기 슬리브를 시프팅시키는 시프트포크; 상기 시프트포크에 구동력을 제공하는 액추에이터; 상기 액추에이터에 연결되어 회전운동을 직선운동으로 변환시키는 리드스크류; 및 상기 리드스크류의 외측에 이중으로 권취된 충격제거수단;으로 구성될 수 있다.The switching means may include a sleeve provided on the input shaft; A shift fork for shifting the sleeve; An actuator providing a driving force to the shift fork; A lead screw connected to the actuator to convert rotational motion into linear motion; And an impact removing means double wound on the outside of the lead screw.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 구비된 내측 코일스프링 및 상기 내측 코일스프링과 반경방향으로 소정의 거리만큼 이격되어 구비된 외측 코일스프링으로 구성되어, 코일스프링이 겹을 형성하도록 구비될 수 있다.The impact removing means is composed of a plurality of coil springs, an inner coil spring provided along an outer circumferential surface of the lead screw, and an outer coil spring provided radially spaced apart from the inner coil spring by a predetermined distance, and the coil spring is It may be provided to form a ply.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 길이방향으로 양측으로 더 돌출될 수 있다.The impact removing means is a plurality of coil springs, provided by forming plies along the outer circumferential surface of the lead screw, and the inner coil spring may protrude further to both sides in the longitudinal direction than the outer coil spring.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 권취수가 더 적을 수 있다.The impact removing means is a plurality of coil springs, provided by forming a ply along the outer circumferential surface of the lead screw, and the inner coil spring may have a smaller number of turns than the outer coil spring.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 피치가 더 작을 수 있다.The impact removing means is a plurality of coil springs, provided by forming plies along the outer circumferential surface of the lead screw, but the inner coil spring may have a smaller pitch than the outer coil spring.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 외측의 코일스프링이 내측의 코일스프링 보다 상기 액추에이터측으로 더 돌출되도록 설치되어, 상기 액추에이터의 회전에 의한 상기 리드스크류의 이동시 외측의 코일스프링이 내측의 코일스프링 보다 먼저 가압될 수 있다.The impact removing means is a plurality of coil springs, provided by forming a ply along the outer circumferential surface of the lead screw, and the outer coil spring is installed to protrude further toward the actuator side than the inner coil spring, and the rotation of the actuator causes the When the leadscrew moves, the outer coil spring may be pressed before the inner coil spring.

상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되고, 상기 코일스프링의 단부에는 상기 코일스프링의 단부가 지지되는 지지부재가 구비되어, 상기 리드스크류의 이동시 상기 지지부재가 가압되어 상기 코일스프링이 압축될 수 있다.The impact removing means is a plurality of coil springs, formed by forming a ply along the outer circumferential surface of the lead screw, and a support member for supporting the end of the coil spring is provided at the end of the coil spring, so that when the lead screw moves, the The support member is pressed so that the coil spring can be compressed.

상기 리드스크류와 시프트포크 사이에는 포크샤프트가 마련되어, 상기 시프트포크의 이동을 보조할 수 있다.A fork shaft is provided between the lead screw and the shift fork to assist the movement of the shift fork.

상술한 바와 같은 구조로 이루어진 4륜구동 차량용 부변속기에 따르면, 2륜구동모드에서 4륜구동모드로의 절환시 입력축과 출력축의 체결 충격을 제거할 수 있는 효과가 있다. 더구나, 구조를 단순화함으로써, 중량 및 원가를 절감하는 효과가 있다. 또한, 절환수단의 액추에이터 해제 작동 중 입력축과 슬리브의 도그클러치 백테이퍼에 의한 추력발생시 그 충격을 완화할 수 있는 장점이 있다.According to the auxiliary transmission for a four-wheel drive vehicle having the structure as described above, there is an effect of removing the coupling impact between the input shaft and the output shaft when switching from the two-wheel drive mode to the four-wheel drive mode. Moreover, by simplifying the structure, there is an effect of reducing weight and cost. In addition, there is an advantage in that the impact can be alleviated when thrust is generated by the dog clutch back taper of the input shaft and the sleeve during the actuator release operation of the switching means.

또한, 전자식 부변속기가 적용될 경우, 절환수단은 액추에이터에 의해 입력축과 출력축의 체결 및 해제 기능 수행으로 추진축의 회전 손실을 차단하여 차량의 연비 개선에 기여할 수 있게 된다.In addition, when the electronic auxiliary transmission is applied, the switching means can contribute to the improvement of fuel economy of the vehicle by blocking the rotational loss of the propulsion shaft by performing the function of engaging and releasing the input shaft and the output shaft by the actuator.

도 1은 본 발명의 일 실시예에 따른 4륜구동 차량용 부변속기를 도시한 도면.
도 2는 도 1의 A-A선 단면도로서, 2륜구동모드에서 4륜구동모드로의 절환 시작을 도시한 도면.
도 3은 도 2의 B를 상세히 도시한 도면.
도 4는 도 1의 A-A선 단면도로서, 2륜구동모드에서 4륜구동모드로의 절환 완료를 도시한 도면.
도 5는 도 4의 C를 상세히 도시한 도면.
도 6은 4륜구동 차량용 부변속기가 장착된 차량을 간략하게 도시한 블록도.
도 7은 종래 단일스프링이 장착된 경우 충격력 감소를 나타내는 그래프.
도 8은 본 발명의 충격제거수단이 장착된 경우 충격력 감소를 나타내는 그래프.1 is a view showing an auxiliary transmission for a four-wheel drive vehicle according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, illustrating the start of switching from a two-wheel drive mode to a four-wheel drive mode.
Figure 3 is a view showing in detail B of Figure 2;
FIG. 4 is a cross-sectional view taken along line AA of FIG. 1, showing the completion of switching from a two-wheel drive mode to a four-wheel drive mode.
Figure 5 is a view showing the detail C of Figure 4;
6 is a block diagram schematically showing a vehicle equipped with an auxiliary transmission for a four-wheel drive vehicle.
7 is a graph showing a reduction in impact force when a conventional single spring is mounted.
8 is a graph showing a reduction in impact force when the impact removing means of the present invention is mounted.

이하에서는 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예에 따른 4륜구동 차량용 부변속기에 대하여 살펴본다.Hereinafter, an auxiliary transmission for a four-wheel drive vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 4륜구동 차량용 부변속기를 도시한 도면이다. 도 2는 도 1의 A-A선 단면도로서, 2륜구동모드에서 4륜구동모드로의 절환 시작을 도시한 도면이며, 도 3은 도 2의 B를 상세히 도시한 도면이다. 도 4는 도 1의 A-A선 단면도로서, 2륜구동모드에서 4륜구동모드로의 절환 완료를 도시한 도면이고, 도 5는 도 4의 C를 상세히 도시한 도면이다. 또한, 도 6은 4륜구동 차량용 부변속기가 장착된 차량을 간략하게 도시한 블록도이고, 도 7은 종래 단일스프링이 장착된 경우 충격력 감소를 나타내는 그래프이며, 도 8은 본 발명의 충격제거수단(910,920)이 장착된 경우 충격력 감소를 나타내는 그래프이다.1 is a view showing an auxiliary transmission for a four-wheel drive vehicle according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, showing a start of switching from a two-wheel drive mode to a four-wheel drive mode, and FIG. 3 is a view showing B of FIG. 2 in detail. FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1, illustrating completion of switching from a two-wheel drive mode to a four-wheel drive mode, and FIG. 5 is a view showing C in detail. In addition, FIG. 6 is a block diagram schematically showing a vehicle equipped with a sub transmission for a four-wheel drive vehicle, FIG. 7 is a graph showing a reduction in impact force when a conventional single spring is mounted, and FIG. 8 is a shock removing means of the present invention ( 910,920) is a graph showing the reduction in impact force when installed.

2륜구동모드와 4륜구동모드를 모두 구현할 수 있는 차량의 경우에는 통상적으로 도 6에 도시한 것과 같이, 엔진(100), 변속기(200), 부변속기(1000), 추진축(300), 전륜(800) 및 후륜(400)의 구성을 갖는다. 본 발명은 상기 부변속기(1000) 중에서도 특히 부변속기(1000)에 마련된 절환수단(900)에 관한 것으로서, 상기 절환수단(900)의 동작시 상기 입력축(500)과 출력축(600)의 체결시 상기 입력축(500)과 출력축(600)의 회전속도 차이에서 발생되는 충격을 제거하기 위한 충격제거수단(910,920)에 관한 것으로서, 2륜구동모드에서 4륜구동모드로의 절환 시 입출력 속도 차이에 의해 발생되는 충격으로 절환수단(900)의 액추에이터(950)가 파손되는 것을 방지하고, 절환력을 확보할 수 있는 구성에 관한 것이다.In the case of a vehicle capable of implementing both the two-wheel drive mode and the four-wheel drive mode, the engine 100, the transmission 200, the auxiliary transmission 1000, the propulsion shaft 300, the front wheel 800, as shown in FIG. ) And a rear wheel 400. The present invention relates to a switching means 900 provided in the auxiliary transmission 1000 among the auxiliary transmissions 1000, and when the input shaft 500 and the output shaft 600 are fastened when the switching means 900 is operated, the It relates to a shock removing means (910,920) for removing the shock generated from the difference in rotational speed between the input shaft 500 and the output shaft 600, and the shock generated by the difference in input/output speed when switching from the two-wheel drive mode to the four-wheel drive mode It relates to a configuration capable of preventing damage to the actuator 950 of the switching means 900 and securing a switching force.

본 발명의 바람직한 일 실시예에 따른 4륜구동 차량용 부변속기는 2륜구동에서 4륜구동으로의 절환시, 엔진(100) 및 변속기(200)로부터 전달되는 동력을 추진축(300)을 통해 후륜(400)으로 전달하는 4륜구동 차량의 부변속기에 있어서, 변속기(200)의 동력이 입력되는 입력축(500); 상기 입력축(500)으로부터 동력을 전달받는 출력축(600); 및 상기 입력축(500)과 출력축(600) 사이에 구비되어, 상기 입력축(500)의 동력을 상기 출력축(600)으로 전달하되, 입출력 속도 차이에서 발생되는 충격을 제거하기 위한 충격제거수단(910,920)이 구비된 절환수단(900);을 포함한다. 상기 출력축(600)은 링기어일 수 있다. 상기 리드스크류(960)와 시프트포크(940) 사이에는 포크샤프트(980)가 마련되어, 상기 시프트포크(940)의 이동을 보조할 수 있다.In the auxiliary transmission for a four-wheel drive vehicle according to a preferred embodiment of the present invention, when switching from two-wheel drive to four-wheel drive, the power transmitted from the engine 100 and the transmission 200 is transferred to the rear wheel 400 through the propulsion shaft 300. In the auxiliary transmission of a four-wheel drive vehicle that transmits, the input shaft 500 to which the power of the transmission 200 is input; An output shaft 600 receiving power from the input shaft 500; And a shock removing means (910,920) provided between the input shaft 500 and the output shaft 600 to transmit the power of the input shaft 500 to the output shaft 600, but to remove an impact generated from a difference in input/output speed. It includes; switching means 900 provided. The output shaft 600 may be a ring gear. A fork shaft 980 is provided between the leadscrew 960 and the shift fork 940 to assist the movement of the shift fork 940.

또한, 상기 절환수단(900)은, 상기 입력축(500)에 마련된 슬리브(930); 상기 슬리브(930)를 시프팅시키는 시프트포크(940); 상기 시프트포크(940)에 구동력을 제공하는 액추에이터(950); 상기 액추에이터(950)에 연결되어 회전운동을 직선운동으로 변환시키는 리드스크류(960); 및 상기 리드스크류(960)의 외측에 이중으로 권취된 충격제거수단(910,920);으로 구성된다. 상기 액추에이터(950)는 모터일 수 있다.In addition, the switching means 900, a sleeve 930 provided on the input shaft 500; A shift fork 940 for shifting the sleeve 930; An actuator 950 providing a driving force to the shift fork 940; A lead screw 960 connected to the actuator 950 to convert a rotational motion into a linear motion; And impact removing means (910,920) double wound on the outside of the leadscrew (960). The actuator 950 may be a motor.

도 2 내지 도 5를 통해 상세하게 살펴보도로 한다. It will be described in detail through FIGS. 2 to 5.

2륜구동모드에서는 상기 변속기(200)의 동력이 상기 후륜(400)으로는 전달되지 않도록 상기 입력축(500)과 출력축(600)은 연결되지 않은 상태이다. 그러나 4륜구동모드로의 구동이 필요한 경우, 상기 입력축(500)과 출력축(600)이 연결되어 상기 엔진(100)의 동력이 입력축(500)을 통해 상기 출력축(600)으로 동력이 전달되고, 상기 출력축(600)으로 전달된 동력은 상기 출력축(600)과 연결된 피니언기어(700)에 의해 추진축(300)을 통해 후륜(400)으로 전달된다.In the two-wheel drive mode, the input shaft 500 and the output shaft 600 are not connected so that the power of the transmission 200 is not transmitted to the rear wheel 400. However, when driving in the four-wheel drive mode is required, the input shaft 500 and the output shaft 600 are connected so that the power of the engine 100 is transmitted to the output shaft 600 through the input shaft 500, and the The power transmitted to the output shaft 600 is transmitted to the rear wheels 400 through the propulsion shaft 300 by the pinion gear 700 connected to the output shaft 600.

따라서, 상기와 같은 2륜구동모드에서 4륜구동모드로의 절환시 후륜(400)에 동력을 전달하기 위하여, 상기 입력축(500)과 출력축(600)을 상기 슬리브(930)가 연결하게 된다. 상기 슬리브(930)는 상기 액추에이터(950)의 구동에 의해 이동되는 상기 리드스크류(960)에 의해 가압되는 상기 시프트포크(940)에 의해 상기 입력축(500)과 출력축(600)이 동기화되도록 시프팅되는 것이다.Accordingly, in order to transmit power to the rear wheels 400 when switching from the two-wheel drive mode to the four-wheel drive mode as described above, the sleeve 930 is connected to the input shaft 500 and the output shaft 600. The sleeve 930 is shifted so that the input shaft 500 and the output shaft 600 are synchronized by the shift fork 940 pressed by the leadscrew 960 moved by the drive of the actuator 950. It becomes.

또한, 상기와 같은 동작시, 상기 입력축(500)과 출력축(600) 간의 속도 차에 의한 충격을 방지하기 위하여 상기 충격제거수단(910,920)이 마련된다. 상기 충격제거수단(910,920)은 상기 리드스크류(960)의 외측에 이중으로 권취된다. 상기 충격제거수단(910,920)의 양단에는 상기 충격제거수단(910,920)이 지지되는 지지부재(970)가 마련될 수 있다. 도 1 내지 도 5를 통하여 상기 충격제거수단(910,920)에 대해 상세하게 설명하도록 한다.In addition, during the above operation, the shock removal means 910 and 920 are provided to prevent an impact due to a difference in speed between the input shaft 500 and the output shaft 600. The impact removing means 910 and 920 are double wound on the outside of the leadscrew 960. Support members 970 on which the impact removing means 910 and 920 are supported may be provided at both ends of the impact removing means 910 and 920. The impact removal means 910 and 920 will be described in detail through FIGS. 1 to 5.

상기 충격제거수단(910,920)은 복수의 코일스프링일 수 있다. 상기 충격제거수단(910,920)은 상기 리드스크류(960)의 외주면을 따라 구비된 내측 코일스프링(910) 및 상기 내측 코일스프링(910)과 반경방향으로 소정의 거리만큼 이격되어 구비된 외측 코일스프링(920)으로 구성되어, 코일스프링이 길이방향이 아닌 반경방향으로 겹(이중)을 형성하도록 구비된다. 따라서, 종래에 상기 충격제거수단(910,920)이 단일 코일스프링으로 구성되던 것에 대비하여 충격흡수량을 증대시킬 수 있는 장점이 있다. The impact removing means 910 and 920 may be a plurality of coil springs. The impact removing means (910,920) is an inner coil spring 910 provided along the outer circumferential surface of the lead screw 960 and an outer coil spring provided spaced apart from the inner coil spring 910 by a predetermined distance in the radial direction ( Consisting of 920), the coil spring is provided to form a ply (double) in a radial direction rather than a longitudinal direction. Accordingly, there is an advantage in that the amount of shock absorption can be increased compared to the conventional shock removing means 910 and 920 being composed of a single coil spring.

또한, 상기 외측 코일스프링(920)은 상기 내측 코일스프링(910) 보다 길이방향으로 양측으로 더 돌출되도록 설치될 수 있다 . 그러므로 상기 리드스크류(960)의 이동으로 인한 상기 지지부재(970)의 가압시, 상기 외측 코일스프링(920)이 먼저 압축되고, 어느 정도 압축이 진행된 후에는 상기 내측 코일스프링(910)도 함께 압축됨으로써, 상기 내측 코일스프링(910)과 외측 코일스프링(920)에 흡수된 압축에너지에 의해 체결력이 증대되어 상기 시프트포크(940)가 상기 슬리브(930)를 보다 잘 시프팅할 수 있게 되어, 상기 입력축(500)과 출력축(600)의 속도차이에 의한 충격을 제거함과 동시에 상기 입력축(500)과 출력축(600)을 빠르고 안정적으로 체결할 수 있게 된다.In addition, the outer coil spring 920 may be installed to protrude further to both sides in the longitudinal direction than the inner coil spring 910 . Therefore, when the support member 970 is pressed due to the movement of the lead screw 960, the outer coil spring 920 is compressed first, and after a certain amount of compression is performed, the inner coil spring 910 is also compressed. As a result, the fastening force is increased by the compressive energy absorbed by the inner coil spring 910 and the outer coil spring 920 so that the shift fork 940 can better shift the sleeve 930, so that the It is possible to quickly and stably fasten the input shaft 500 and the output shaft 600 while removing the impact caused by the difference in speed between the input shaft 500 and the output shaft 600.

또한, 상기 충격제거수단(910,920)은 상기 내측의 코일스프링이 외측의 코일스프링 보다 권취수가 더 적게 구성할 수도 있고, 상기 내측 코일스프링(910)이 외측 코일스프링(920) 보다 피치가 더 작도록 구성할 수도 있다.In addition, the impact removing means (910,920) may be configured to have a smaller number of turns than the outer coil spring in the inner coil spring, and the inner coil spring 910 has a smaller pitch than the outer coil spring (920). It can also be configured.

특히, 상기한 바와 같이, 상기 외측 코일스프링(920)이 상기 내측 코일스프링(910) 보다 먼저 압축되게 하기 위하여, 상기 외측 코일스프링(920)은 상기 내측 코일스프링(910) 보다 상기 액추에이터(950)측으로 더 돌출되도록 설치된다. 따라서, 상기 액추에이터(950)의 회전에 의한 상기 리드스크류(960)의 이동시 외측의 코일스프링이 내측의 코일스프링 보다 먼저 가압됨으로써, 상기 입력축(500)과 출력축(600)의 체결시 상기 입력축(500)과 출력축(600)의 속도 차에 의한 충격을 제거하고, 상기 입력축(500)과 출력축(600)의 체결력을 증대시키는 효과가 있다.In particular, as described above, in order to cause the outer coil spring 920 to be compressed earlier than the inner coil spring 910, the outer coil spring 920 is the actuator 950 than the inner coil spring 910. It is installed so as to protrude further to the side. Therefore, when the lead screw 960 is moved by the rotation of the actuator 950, the outer coil spring is pressed before the inner coil spring, so that when the input shaft 500 and the output shaft 600 are fastened, the input shaft 500 ) And the output shaft 600 to remove the impact due to the speed difference, there is an effect of increasing the fastening force between the input shaft 500 and the output shaft 600.

또한, 상기 코일스프링의 단부에는 상기 코일스프링의 단부가 지지되는 지지부재(970)가 구비된다. 따라서, 상기 리드스크류(960)의 이동시 상기 지지부재(970)가 가압되어 상기 내측 코일스프링(910) 및 외측 코일스프링(920)이 압축된다. 반대의 경우에는 상기 리드스크류(960)의 이동시 상기 지지부재(970)가 가압 해제되어 상기 내측 코일스프링(910) 및 외측 코일스프링(920)이 압축 해제된다. 상기 지지부재(970)는 상기 시프트포크(940) 내에 마련될 수 있다.In addition, a support member 970 is provided at an end of the coil spring to support the end of the coil spring. Accordingly, when the leadscrew 960 is moved, the support member 970 is pressed to compress the inner coil spring 910 and the outer coil spring 920. In the opposite case, when the lead screw 960 is moved, the support member 970 is depressed and the inner coil spring 910 and the outer coil spring 920 are decompressed. The support member 970 may be provided in the shift fork 940.

도 7은 종래 단일스프링이 장착된 경우 충격력 감소를 나타내는 그래프이고, 도 8은 본 발명의 충격제거수단(910,920)이 장착된 경우 충격력 감소를 나타내는 그래프이다. 도 7 내지 도 8을 살펴보면, 종래 단일스프링이 장착된 경우에는 상기 입력축(500)과 출력축(600)의 체결에 따른 최초 충격력 감소가 나타나는 시점이 D지점(약 8 정도)인 것에 반해, 본 발명의 상기 충격제거수단(910,920)인 이중 코일스프링이 구비된 경우에는 최초 충격력 감소가 나타나는 시점이 E지점(약 4 정도)로서, 체결에 따른 충격력 감소의 효과가 현저한 것을 알 수 있다.7 is a graph showing a reduction in impact force when a conventional single spring is mounted, and FIG. 8 is a graph showing a decrease in impact force when the impact removing means 910 and 920 of the present invention are mounted. Referring to Figures 7 to 8, when a conventional single spring is mounted, the first impact force decrease due to the fastening of the input shaft 500 and the output shaft 600 appears at point D (about 8), whereas the present invention When the double coil spring, which is the impact removing means 910 and 920 of, is provided, the point at which the initial impact force decrease occurs is point E (about 4), and it can be seen that the effect of reducing the impact force according to the fastening is remarkable.

따라서, 상기와 같은 4륜구동 차량용 부변속기는 2륜구동모드에서 4륜구동모드로의 절환시 입력축(500)과 출력축(600)의 체결 충격을 제거하고 구조를 단순화함으로써, 중량 및 원가를 절감하는 효과가 있다. 또한, 절환수단(900)의 액추에이터(950) 해제 작동 중 입력축(500)과 슬리브(930)의 도그클러치 백테이퍼에 의한 추력발생시 그 충격을 완화할 수 있는 장점이 있다.Therefore, the auxiliary transmission for a four-wheel drive vehicle as described above has the effect of reducing weight and cost by removing the impact of the coupling between the input shaft 500 and the output shaft 600 and simplifying the structure when switching from the two-wheel drive mode to the four-wheel drive mode. have. In addition, there is an advantage of mitigating the impact when thrust is generated by the dog clutch back taper of the input shaft 500 and the sleeve 930 during the releasing operation of the actuator 950 of the switching means 900.

또한, 전자식 부변속기(1000)가 적용될 경우, 절환수단(900)은 액추에이터(950)에 의해 입력축(500)과 출력축(600)의 체결 및 해제 기능 수행으로 추진축(300)의 회전 손실을 차단하여 차량의 연비 개선에 기여할 수 있게 된다.In addition, when the electronic auxiliary transmission 1000 is applied, the switching means 900 blocks the rotational loss of the propulsion shaft 300 by performing the fastening and releasing function of the input shaft 500 and the output shaft 600 by the actuator 950. It will be able to contribute to improving the fuel economy of the vehicle.

본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구범위에 의해 제공되는 본 발명의 기술적 사상을 벗어나지 않는 한도 내에서, 본 발명이 다양하게 개량 및 변화될 수 있다는 것은 당 업계에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.Although the present invention has been shown and described in connection with specific embodiments, it is in the art that the present invention can be variously improved and changed within the scope of the technical spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill.

100 : 엔진 200 : 변속기
300 : 추진축 400 : 후륜
500 : 입력축 600 : 출력축
700 : 피니언기어 800 : 전륜
900 : 절환수단 910 : 내측 코일스프링
920 : 외측 코일스프링 930 : 슬리브
940 : 시프트포크 950 : 액추에이터
960 : 리드스크류 970 : 지지부재
980 : 포크샤프트 1000 : 부변속기100: engine 200: transmission
300: propulsion shaft 400: rear wheel
500: input shaft 600: output shaft
700: pinion gear 800: front wheel
900: switching means 910: inner coil spring
920: outer coil spring 930: sleeve
940: shift fork 950: actuator
960: lead screw 970: support member
980: fork shaft 1000: sub transmission

Claims (9)

2륜구동에서 4륜구동으로의 절환시, 엔진 및 변속기로부터 전달되는 동력을 추진축을 통해 후륜으로 전달하는 4륜구동 차량의 부변속기에 있어서,
변속기의 동력이 입력되는 입력축;
상기 입력축으로부터 동력을 전달받는 출력축; 및
상기 입력축과 출력축 사이에 구비되어, 상기 입력축의 동력을 상기 출력축으로 전달하되, 입출력 속도 차이에서 발생되는 충격을 제거하기 위한 충격제거수단이 구비된 절환수단;을 포함하고,
상기 절환수단은,
상기 입력축에 마련된 슬리브;
상기 슬리브를 시프팅시키는 시프트포크;
상기 시프트포크에 구동력을 제공하는 액추에이터;
상기 액추에이터에 연결되어 회전운동을 직선운동으로 변환시키는 리드스크류; 및
상기 리드스크류의 외측에 이중으로 권취된 충격제거수단;으로 구성되며,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 구비된 내측 코일스프링 및 상기 내측 코일스프링과 반경방향으로 소정의 거리만큼 이격되어 구비된 외측 코일스프링으로 구성되어, 코일스프링이 겹을 형성하도록 구비되는 것을 특징으로 하는 4륜구동 차량용 부변속기.In the secondary transmission of a four-wheel drive vehicle that transmits power transmitted from an engine and a transmission to a rear wheel through a propulsion shaft when switching from two-wheel drive to four-wheel drive,
An input shaft to which power of the transmission is input;
An output shaft receiving power from the input shaft; And
Including; a switching means provided between the input shaft and the output shaft, which transmits the power of the input shaft to the output shaft, and has a shock removing means for removing the shock generated from the input and output speed difference;
The switching means,
A sleeve provided on the input shaft;
A shift fork for shifting the sleeve;
An actuator providing a driving force to the shift fork;
A lead screw connected to the actuator to convert rotational motion into linear motion; And
Consists of; impact removing means double wound on the outside of the leadscrew,
The impact removing means is composed of a plurality of coil springs, an inner coil spring provided along an outer circumferential surface of the lead screw, and an outer coil spring provided radially spaced apart from the inner coil spring by a predetermined distance, and the coil spring is A secondary transmission for a four-wheel drive vehicle, characterized in that provided to form a fold. 삭제delete 삭제delete 청구항 1에 있어서,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 길이방향으로 양측으로 더 돌출되는 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
The impact removing means is a plurality of coil springs, provided by forming a ply along the outer circumferential surface of the lead screw, wherein the inner coil spring protrudes further to both sides in the longitudinal direction than the outer coil spring. Transmission. 청구항 1에 있어서,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 권취수가 더 적은 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
The impact removing means is a plurality of coil springs, provided to form a fold along the outer circumferential surface of the lead screw, wherein the inner coil spring has a smaller number of turns than the outer coil spring. 청구항 1에 있어서,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 내측의 코일스프링이 외측의 코일스프링 보다 피치가 더 작은 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
The shock removing means is a plurality of coil springs, provided to form a fold along the outer circumferential surface of the lead screw, wherein the inner coil spring has a smaller pitch than the outer coil spring. 청구항 1에 있어서,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되되, 외측의 코일스프링이 내측의 코일스프링 보다 상기 액추에이터측으로 더 돌출되도록 설치되어, 상기 액추에이터의 회전에 의한 상기 리드스크류의 이동시 외측의 코일스프링이 내측의 코일스프링 보다 먼저 가압되는 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
The impact removing means is a plurality of coil springs, provided by forming a ply along the outer circumferential surface of the lead screw, and the outer coil spring is installed to protrude further toward the actuator side than the inner coil spring, and the rotation of the actuator causes the An auxiliary transmission for a four-wheel drive vehicle, characterized in that the outer coil spring is pressed before the inner coil spring when the lead screw is moved. 청구항 1에 있어서,
상기 충격제거수단은 복수의 코일스프링으로서, 상기 리드스크류의 외주면을 따라 겹을 형성하여 구비되고, 상기 코일스프링의 단부에는 상기 코일스프링의 단부가 지지되는 지지부재가 구비되어, 상기 리드스크류의 이동시 상기 지지부재가 가압되어 상기 코일스프링이 압축되는 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
The impact removing means is a plurality of coil springs, formed by forming a ply along the outer circumferential surface of the lead screw, and a support member for supporting the end of the coil spring is provided at the end of the coil spring, so that when the lead screw moves, the A secondary transmission for a four-wheel drive vehicle, characterized in that the support member is pressed to compress the coil spring. 청구항 1에 있어서,
상기 리드스크류와 시프트포크 사이에는 포크샤프트가 마련되어, 상기 시프트포크의 이동을 보조하는 것을 특징으로 하는 4륜구동 차량용 부변속기.The method according to claim 1,
A fork shaft is provided between the lead screw and the shift fork to assist the movement of the shift fork.
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KR102701953B1 (en) * 2022-04-27 2024-09-04 주식회사평화발레오 Disconnector apparatus

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