KR100579242B1 - Hydraulic control system of continuously variable transmission for vehicle - Google Patents

Hydraulic control system of continuously variable transmission for vehicle Download PDF

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KR100579242B1
KR100579242B1 KR1020030077697A KR20030077697A KR100579242B1 KR 100579242 B1 KR100579242 B1 KR 100579242B1 KR 1020030077697 A KR1020030077697 A KR 1020030077697A KR 20030077697 A KR20030077697 A KR 20030077697A KR 100579242 B1 KR100579242 B1 KR 100579242B1
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continuously variable
variable transmission
valve
control system
hydraulic pressure
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KR1020030077697A
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Korean (ko)
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KR20050042650A (en
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이진희
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현대자동차주식회사
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    • 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
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/065—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means
    • F16H61/067—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means using an accumulator
    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H2061/0034—Accumulators for fluid pressure supply; Control thereof
    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
    • 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
    • F16H61/66—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 specially adapted for continuously variable gearings
    • F16H61/662—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 specially adapted for continuously variable gearings with endless flexible members
    • F16H2061/66204—Control for modifying the ratio control characteristic
    • F16H2061/66222—Control for modifying the ratio control characteristic the ratio is varied in order to reduce surface wear of belt or pulley
    • 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
    • F16H61/66—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 specially adapted for continuously variable gearings
    • F16H61/662—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 specially adapted for continuously variable gearings with endless flexible members
    • F16H2061/66286—Control for optimising pump efficiency
    • 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
    • F16H61/66—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 specially adapted for continuously variable gearings
    • F16H61/662—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 specially adapted for continuously variable gearings with endless flexible members
    • F16H2061/66295—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 specially adapted for continuously variable gearings with endless flexible members characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis

Abstract

마찰부재로 공급되는 유압의 맥동을 완화시켜 변속감 향상 및 변속충격을 최소화할 수 있도록 함으로써, 무단 변속기에 대한 신뢰성과 안정성을 확보할 목적으로;By relieving the pulsation of the hydraulic pressure supplied to the friction member to improve the shift feeling and to minimize the shift shock, for the purpose of ensuring the reliability and stability for the continuously variable transmission;

다수의 스풀 밸브를 보유하면서 오일펌프로부터 압송되는 유압을 프라이머리 풀리와 세컨들리 풀리에 공급하여 직경 변위에 따라 무단으로 변속이 이루어지도록 함과 동시에 전진시 작동하는 포워드 클러치와 후진시 작동하는 리버스 브레이크에 공급되는 유압을 제어할 수 있도록 구성되는 차량용 무단 변속기의 유압 제어시스템에 있어서, It has a large number of spool valves and supplies hydraulic pressure pumped from the oil pump to the primary pulley and the secondary pulley so that the shifting can be carried out steplessly according to the displacement of the diameter, while the forward clutch operates in the forward direction and the reverse brake operates in the reverse direction. In the hydraulic control system of a continuously variable transmission for a vehicle configured to control the hydraulic pressure supplied to,

상기 포워드 클러치와 리버스 브레이크의 작동압 관로 사이에 양 관로를 통해 공급되는 유압을 안정화시킬 수 있도록 양방향 어큐믈레이터를 배치하여 이루어짐을 특징으로 하는 차량용 무단 변속기의 유압 제어시스템을 제공한다.Provides a hydraulic control system of a continuously variable transmission for a vehicle, characterized in that the bidirectional accumulator is arranged between the forward clutch and the operating pressure pipeline of the reverse brake to stabilize the hydraulic pressure supplied through both pipelines.

포워드 클러치. 립스 브레이크. 어큐믈레이터. Forward clutch. Brakes for lip. Accumulator.

Description

자동차용 무단변속기의 유압 제어시스템{HYDRAULIC CONTROL SYSTEM OF CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE}HYDRAULIC CONTROL SYSTEM OF CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE}

도 1은 본 발명에 의한 유압 제어시스템의 유압 회로도.1 is a hydraulic circuit diagram of a hydraulic control system according to the present invention.

도 2의 (a)(b)는 본 발명의 작동상태를 보인 요부 확대도. Figure 2 (a) (b) is an enlarged view of the main portion showing the operating state of the present invention.

도 3은 종래 무단 변속기 유압 제어시스템의 일 실시예도이다.Figure 3 is an embodiment of a conventional continuously variable transmission hydraulic control system.

본 발명은 차량용 무단 변속기의 유압 제어시스템에 관한 것으로서, 보다 상세하게는 매뉴얼 변속시 변속감을 향상시키고, 유압 맥동에 의한 변속 충격을 완화하여 무단 변속기에 대한 신뢰성과 안정성을 확보할 수 있도록 한 무단 변속기의 유압 제어시스템에 관한 것이다.The present invention relates to a hydraulic control system of a continuously variable transmission for a vehicle, and more particularly, a continuously variable transmission to improve the transmission feeling during manual shifting and to mitigate shifting shock caused by hydraulic pulsation to secure reliability and stability for the continuously variable transmission. Of the hydraulic control system.

예컨대, 차량의 변속기에는 엔진의 회전력을 구동륜에 전달하는 기능을 갖고 있는데, 이러한 변속기에는 운전자의 의지대로 운전자가 직접 변속단을 선택하는 수동 변속기와, 차량의 주행조건에 따라 자동적으로 변속이 이루어지는 자동 변속기와, 각 변속단 사이에 특정한 변속 영역이 없이 무단으로 연속적인 변속이 이루어지는 무단 변속기로 대별된다.For example, the transmission of the vehicle has a function of transmitting the rotational force of the engine to the drive wheels, and such a transmission includes a manual transmission in which the driver directly selects a shift stage at the driver's will, and automatic transmission in which the shift is automatically performed according to the driving conditions of the vehicle. It is roughly classified into a transmission and a continuously variable transmission in which continuously shifting is performed without a specific shift range between each shift stage.

상기와 같은 변속기에 있어서, 본 발명은 유압을 이용하는 자동 변속기의 단점을 보완하여 연비 및 동력 전달성능, 그리고 중량면에서 큰 장점을 갖는 무단 변속기에 관계하며, 이의 무단 변속기는 입력축과 출력축에 장착되는 풀리의 직경변위를 이용하는 방식이 주로 사용되고 있다.In the transmission as described above, the present invention relates to a continuously variable transmission having a great advantage in terms of fuel economy, power transmission performance, and weight by complementing the disadvantages of the automatic transmission using hydraulic pressure, the continuously variable transmission thereof is mounted on the input shaft and the output shaft The method using the diameter displacement of a pulley is mainly used.

이러한 무단 변속기에 있어서, 구동 및 피동축 풀리는 고정측 풀리와 이동측 풀리로 이루어져 가변측 풀리의 후측에 형성된 유압 쳄버에 작용하는 유압에 의해 구동 토크에 알맞는 수준으로 가변측 풀리가 금속벨트 측면에 추력을 가하게 되며, 이들 풀리의 직경 변환에 따라 무단 변속이 이루어지게 되는 것이다.In such a continuously variable transmission, the driving and driven shaft pulleys consist of the fixed side pulley and the moving side pulley, and the variable side pulley is provided on the side of the metal belt at a level suitable for the driving torque by the hydraulic pressure acting on the hydraulic chamber formed on the rear side of the variable side pulley. Thrust is applied, and the speed change is made according to the diameter change of these pulleys.

이와같이 벨트 풀리의 직경 가변에 동력원으로 사용되는 유압을 제어하는 유압 제어시스템의 구성을 살펴보면, 도 3에서와 같이, 오일펌프(202)로부터 압송되는 유압은 라인 레귤레어터 밸브(204)를 통해 라인압이 1차적으로 조절되어 세컨드 레귤레이터 밸브(206)와 무단 변속기구의 세컨들리 풀리(208)로 공급된다.Looking at the configuration of the hydraulic control system for controlling the hydraulic pressure used as the power source for the variable diameter of the belt pulley, as shown in Figure 3, the hydraulic pressure pumped from the oil pump 202 is line through the line regulator valve 204 Pressure is primarily regulated and supplied to the second regulator valve 206 and the secondary pulley 208 of the continuously variable transmission.

그리고 상기 세컨드 레귤레이터 밸브(206)에서는 1차로 조절된 유압을 다시 2차로 조절하여 전,후진 제어수단인 프레셔 레귤레이터 밸브(210)와, 페일 세이프 밸브(212)와, 변속비 컨트롤 밸브(214)를 제어하는 제1 솔레노이드 밸브(S1) 및 라인 레귤레이터 밸브(204)를 제어하는 제2 솔레노이드 밸브(S2)와, 감압수단인 리듀싱 밸브(216) 그리고 라인 릴리이프 밸브(218)로 공급된다.In addition, the second regulator valve 206 controls the primary hydraulic pressure again to the second to control the pressure regulator valve 210, the fail safe valve 212, and the speed ratio control valve 214, which are forward and backward control means. The first solenoid valve S1 and the second solenoid valve S2 for controlling the line regulator valve 204 are supplied to the reducing valve 216 and the line relief valve 218 which are pressure reducing means.

또한, 상기 리듀싱 밸브(216)에 의해 감압된 유압은 전,후진 제어수단의 프레셔 컨트롤 밸브(210)을 제어하는 제3 솔레노이드 밸브(S3)와, 댐퍼 클러치 제어수단의 댐퍼 클러치 컨트롤 밸브(220)를 제어하는 제4 솔레노이드 밸브(S4)로 공급 된다.In addition, the hydraulic pressure reduced by the reducing valve 216 is the third solenoid valve (S3) for controlling the pressure control valve 210 of the forward, backward control means, and the damper clutch control valve 220 of the damper clutch control means. ) Is supplied to the fourth solenoid valve S4.

상기 프레셔 컨트롤 밸브(210)에서 제어되는 유압은 매뉴얼 밸브(222)를 통해 레인지 변환에 따라 선택적으로 포워드 클러치(C) 또는 리버스 브레이크(B)로 공급되며, 상기 라인 레귤레이터 밸브(204)의 리턴 라인상에 배치되는 토크 컨버터 피드 밸브(224)는 댐퍼 클러치 컨트롤 밸브(220)의 토크 컨버터 릴리이즈 압과 페일 세이프 밸브(212)의 릴리이즈 압을 제어하면서 리턴시키게 된다.The hydraulic pressure controlled by the pressure control valve 210 is selectively supplied to the forward clutch C or the reverse brake B according to the range change through the manual valve 222, and the return line of the line regulator valve 204 is provided. The torque converter feed valve 224 disposed thereon is returned while controlling the torque converter release pressure of the damper clutch control valve 220 and the release pressure of the fail safe valve 212.

그리고 상기 변속비 컨트롤 밸브(214)는 프라이머리 풀리(226)의 작동압과 상기 페일 세이프 밸브(212)의 제어압을 공급할 수 있도록 연통되고, 이그져스트 밸브(228)와도 연통되어 프라이머리 풀리(226)의 릴리이즈 압이 제어되도록 구성되어 있다.In addition, the speed ratio control valve 214 is in communication with each other to supply the operating pressure of the primary pulley 226 and the control pressure of the fail-safe valve 212, and is also in communication with the exhaust valve 228 to the primary pulley 226. ) Is configured to control the release pressure.

또한, 상기 포워드 클러치(C)와 리버스 브레이크(B)의 관로(230)(232)는 바이패스 관로(234)에 의하여 상호 연결되도록 하되, 상기 바이패스 관로(234)상에는 셔틀밸브(236)을 배치하고, 이의 셔틀밸브(236)의 일측 출구에는 매뉴얼 변속시의 변속감과 유압 맥동을 완화시킬 수 있는 어큐믈레이터(238)를 배치하고 있다.In addition, the pipelines 230 and 232 of the forward clutch C and the reverse brake B are connected to each other by a bypass pipeline 234, but a shuttle valve 236 is provided on the bypass pipeline 234. At one outlet of the shuttle valve 236, an accumulator 238 capable of alleviating shifting feeling and hydraulic pulsation during manual shifting is disposed.

상기에서 제1,2 솔레노이드 밸브(S1)(S2)는 3웨이 밸브이고, 제3,4 솔레노이드 밸브(S3)(S4)는 온/오프 밸브이다.In the above description, the first and second solenoid valves S1 and S2 are three-way valves, and the third and fourth solenoid valves S3 and S4 are on / off valves.

이에따라 라인 레귤레이터 밸브(204)에서 공급되는 유압이 프레셔 레귤레이터 밸브(210)에서 제어되어 매뉴얼 밸브(222)로 공급되면, 매뉴얼 밸브(222)의 레인지 변환에 따라 포워드 클러치(C) 또는 리버스 브레이크(B)로 공급되어 전,후진이 선택되고, 제1 솔레노이드 밸브(S1)의 제어에 의하여 변속비 컨트롤 밸브(214) 가 제어되면서 유압이 프라이머리 풀리(226)로 공급되면서 무단 변속이 이루어지게 되는 것이다.Accordingly, when the hydraulic pressure supplied from the line regulator valve 204 is controlled by the pressure regulator valve 210 and supplied to the manual valve 222, the forward clutch C or the reverse brake B according to the range change of the manual valve 222. ) Is supplied to the forward and reverse, and the speed ratio control valve 214 is controlled by the control of the first solenoid valve (S1) while the hydraulic pressure is supplied to the primary pulley 226 is to perform a stepless shift.

상기와 같은 무단 변속기의 유압 제어시스템에 있어서는 매뉴얼 변속시의 변속감 향상과 유압 맥동 완화를 위한 목적으로 유로 변환용 셔틀밸브와 유입되는 유압을 제어하기 위한 어큐믈레이터를 적용하여 포워드 클러치 작동압 또는 리버스 브레이크 작동압에 따라 셔틀밸브 케이스(240)내에서 스틸 볼(242)이 좌우 이동하면서 포워드 클러치 작동압이 리버스 브레이크측으로 유입되지 못하도록 하거나, 반대로 리버스 브레이크 작동압이 포워드 클러치측으로 공급되지 않고 어큐믈레이터(238)로만 유압되어 어큐믈레이터의 고유 기능을 수행할 수 있도록 하고 있다.In the hydraulic control system of the continuously variable transmission as described above, a forward clutch operating pressure or reverse is applied by applying a shut-off valve for converting the flow path and an accumulator for controlling the flow of hydraulic pressure for the purpose of improving the feeling of shifting and reducing hydraulic pulsation during manual shifting. The steel ball 242 moves left and right within the shuttle valve case 240 according to the brake operating pressure so that the forward clutch operating pressure does not flow to the reverse brake side, or conversely, the reverse brake operating pressure is not supplied to the forward clutch side and the accumulator Only hydraulic pressure (238) allows the accumulator to perform its own function.

그러나 상기와 같이 셔틀밸브를 적용하는 경우에 있어서는 셔틀밸브내의 스틸볼이 빈번하게 이동되면서 밸브 케이스와 부딪치게 되는 바, 장기간 사용시 마모가 이루어지면서 시일링 효과를 점차로 떨어뜨릴 수 밖에 없다.However, in the case of applying the shuttle valve as described above, the steel ball in the shuttle valve is frequently moved and collides with the valve case, so that the sealing effect is gradually reduced as the wear occurs for a long time.

이와같이 스틸볼과 이의 스틸볼과 접촉되는 부분이 마모되어 시일링 효과가 떨어지게 되는 경우에는 변속감 및 변속충격에 직접적인 원인이 되어 변속감 및 변속충격의 발생으로 무단 변속기에 대한 신뢰성 저하는 물론 안정성에도 많은 악영향을 미친다는 문제점을 내포하고 있다.In this case, when the steel ball and its contact with the steel ball are worn down and the sealing effect is reduced, it is a direct cause of the shifting feeling and the shifting shock, which causes the shifting feeling and the shifting shock, thereby deteriorating the reliability of the continuously variable transmission and adversely affecting the stability. There is a problem of going crazy.

따라서 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명된 것으로서, 본 발명의 목적은 하나의 양방향 어큘레이터에 의하여 유압 맥동을 완화시킬 수 있도록 하여 변속감 향상 및 변속충격을 최소화할 수 있도록 함으로써, 무단 변속기 에 대한 신뢰성과 안정성을 확보할 수 있는 무단 변속기의 유압 제어시스템을 제공함에 있다.Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to enable to reduce the hydraulic pulsation by one bidirectional accumulator to improve the transmission feeling and minimize the transmission shock, continuously variable transmission It is to provide a hydraulic control system of a continuously variable transmission that can secure reliability and stability.

이를 실현하기 위하여 본 발명은, 다수의 스풀 밸브를 보유하면서 오일펌프로부터 압송되는 유압을 프라이머리 풀리와 세컨들리 풀리에 공급하여 직경 변위에 따라 무단으로 변속이 이루어지도록 함과 동시에 전진시 작동하는 포워드 클러치와 후진시 작동하는 리버스 브레이크에 공급되는 유압을 제어할 수 있도록 구성되는 차량용 무단 변속기의 유압 제어시스템에 있어서, In order to realize this, the present invention, while having a plurality of spool valves to supply hydraulic pressure pumped from the oil pump to the primary pulley and the secondary pulley so that the shift is performed steplessly in accordance with the diameter displacement and at the same time forward operation In the hydraulic control system of a continuously variable transmission for a vehicle configured to control the hydraulic pressure supplied to the clutch and the reverse brake operating when reversing,

상기 포워드 클러치와 리버스 브레이크의 작동압 관로 사이에 양 관로를 통해 공급되는 유압을 안정화시킬 수 있도록 양방향 어큐믈레이터를 배치하여 이루어짐을 특징으로 하는 차량용 무단 변속기의 유압 제어시스템을 제공한다.Provides a hydraulic control system of a continuously variable transmission for a vehicle, characterized in that the bidirectional accumulator is arranged between the forward clutch and the operating pressure pipeline of the reverse brake to stabilize the hydraulic pressure supplied through both pipelines.

이하, 상기의 목적을 구체적으로 실현할 수 있는 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

도 1은 본 발명에 의한 유압 제어시스템의 구성도로서, 벨트식 무단변속기를 운용하기 위한 유압제어시스템은, 오일펌프(2)로부터 압송되는 유압은 라인 레귤레어터 밸브(4)를 통해 라인압이 1차적으로 조절되어 세컨드 레귤레이터 밸브(6)와 무단 변속기구의 세컨들리 풀리(8)로 공급된다.1 is a configuration diagram of a hydraulic control system according to the present invention, in which a hydraulic control system for operating a belt type continuously variable transmission includes: a hydraulic pressure fed from an oil pump 2 is a line pressure through a line regulator valve 4; This primary adjustment is supplied to the second regulator valve 6 and the secondary pulley 8 of the continuously variable transmission.

그리고 상기 세컨드 레귤레이터 밸브(6)에서는 1차로 조절된 유압을 다시 2차로 조절하여 전,후진 제어수단인 압력 제어밸브(10)와, 페일 세이프 밸브(12)와, 변속비 컨트롤 밸브(14)를 제어하는 제1 솔레노이드 밸브(S1) 및 라인 레귤레이터 밸브(4)를 제어하는 제2 솔레노이드 밸브(S2)와, 감압수단인 리듀싱 밸브(16) 그리고 라인 릴리이프 밸브(18)로 공급된다.In the second regulator valve 6, the hydraulic pressure firstly controlled is adjusted again to control the pressure control valve 10, the fail-safe valve 12, and the speed ratio control valve 14, which are forward and backward control means. The first solenoid valve S1 and the second solenoid valve S2 for controlling the line regulator valve 4, the reducing valve 16 serving as the pressure reducing means, and the line relief valve 18 are supplied.

또한, 상기 리듀싱 밸브(16)에 의해 감압된 유압은 전,후진 제어수단의 압력제어밸브(10)를 제어하는 제3 솔레노이드 밸브(S3)와, 댐퍼 클러치 제어수단의 댐퍼 클러치 컨트롤 밸브(20)를 제어하는 제4 솔레노이드 밸브(S4)로 공급된다.In addition, the hydraulic pressure reduced by the reducing valve 16 is the third solenoid valve (S3) for controlling the pressure control valve 10 of the forward and backward control means, and the damper clutch control valve 20 of the damper clutch control means. Is supplied to the fourth solenoid valve S4.

상기 프레셔 컨트롤 밸브(10)에서 제어되는 유압은 매뉴얼 밸브(22)를 통해 레인지 변환에 따라 선택적으로 포워드 클러치(C) 또는 리버스 브레이크(B)로 공급되며, 상기 라인 레귤레이터 밸브(4)의 리턴 라인상에 배치되는 토크 컨버터 피드 밸브(24)는 댐퍼 클러치 컨트롤 밸브(20)의 토크 컨버터 릴리이즈 압과 페일 세이프 밸브(12)의 릴리이즈 압을 제어하면서 리턴시키게 된다.The hydraulic pressure controlled by the pressure control valve 10 is selectively supplied to the forward clutch C or the reverse brake B according to the range change through the manual valve 22, and the return line of the line regulator valve 4 is provided. The torque converter feed valve 24 disposed thereon is returned while controlling the torque converter release pressure of the damper clutch control valve 20 and the release pressure of the fail safe valve 12.

그리고 상기 변속비 컨트롤 밸브(14)는 프라이머리 풀리(26)의 작동압과 상기 페일 세이프 밸브(12)의 제어압을 공급할 수 있도록 연통되고, 이그져스트 밸브(28)와도 연통되어 프라이머리 풀리(26)의 릴리이즈 압이 제어되도록 구성되어 있다.In addition, the speed ratio control valve 14 is in communication with each other to supply the operating pressure of the primary pulley 26 and the control pressure of the fail-safe valve 12, and also communicates with the exhaust valve 28 to the primary pulley 26. ) Is configured to control the release pressure.

상기에서 제1,2 솔레노이드 밸브(S1)(S2)는 3웨이 밸브이고, 제3,4 솔레노이드 밸브(S3)(S4)는 온/오프 밸브이다.In the above description, the first and second solenoid valves S1 and S2 are three-way valves, and the third and fourth solenoid valves S3 and S4 are on / off valves.

이에따라 라인 레귤레이터 밸브(4)에서 공급되는 유압이 압력제어밸브(10)에서 제어되어 매뉴얼 밸브(22)로 공급되면, 매뉴얼 밸브(22)의 레인지 변환에 따라 포워드 클러치(C) 또는 리버스 브레이크(B)로 공급되어 전,후진이 선택되고, 제1 솔레노이드 밸브(S1)의 제어에 의하여 변속비 컨트롤 밸브(14)가 제어되면서 유압 이 프라이머리 풀리(26)로 공급되면서 무단 변속이 이루어지게 되는 것이다.Accordingly, when the hydraulic pressure supplied from the line regulator valve 4 is controlled by the pressure control valve 10 and supplied to the manual valve 22, the forward clutch C or the reverse brake B according to the range change of the manual valve 22 is performed. ) Is supplied to the front and the reverse, and the speed ratio control valve 14 is controlled by the control of the first solenoid valve (S1) while the hydraulic pressure is supplied to the primary pulley (26) to make a stepless shift.

이러한 무단 변속기의 유압 제어시스템에 있어서, 본 발명은 상기 포워드 클러치(C)와 리버스 브레이크(B)의 관로(30)(32) 사이에 양방향 어큐믈레이터(34)를 배치하였다.In the hydraulic control system of such a continuously variable transmission, the present invention has arranged a bidirectional accumulator 34 between the forward clutch C and the conduits 30 and 32 of the reverse brake B.

상기에서 양 방향 어큐믈레터(34)는 케이스(36)의 양측단부에 포트(38)(40)를 형성하여 일측 포트(38)는 상기 포워드 클러치(C)의 관로(30)와 연통시키고, 타측 포트(40)는 리버스 브레이크(B)의 관로(32)에 연통시켰다.The two-way accumulator 34 forms ports 38 and 40 at both ends of the case 36 so that one side port 38 communicates with the conduit 30 of the forward clutch C. The other port 40 was connected to the conduit 32 of the reverse brake B.

그리고 상기 케이스(36)의 내부에 내장되는 피스톤(42)은 양측으로 각각 탄성부재(44)(46)를 배치하여 피스톤(38)이 탄성력을 받도록 하였으며, 상기 탄성부재(40)(42)의 탄성력은 상호 동일하게 하거나, 전진압 또는 후진압의 설정압에 따라 달리 설정할 수 있다.In addition, the piston 42 embedded in the case 36 has elastic members 44 and 46 disposed on both sides thereof so that the piston 38 receives an elastic force, and the elastic members 40 and 42 The elastic force may be the same, or may be set differently according to the set pressure of the forward or reverse pressure.

또한, 피스톤(38) 양측 유압 작용면의 면적을 다르게 설정하는 경우에는 제어의 폭을 넓힐 수도 있을 것이다. In addition, if the area of the hydraulic actuation surface on both sides of the piston 38 is set differently, the width of the control may be widened.

상기의 구성에 의하여 전진을 위하여 포워드 클러치(C)로 작동압이 공급될 때에는 그 작동압 일부가 도2의 a에서와 같이 전진압 포트(38)를 통해 어큐믈레이터(34)로 공급되면서 안정적으로 제어되고, 후진을 위하여 리버스 브레이크(B)로 작동압이 공급될 때에는 그 작동압 일부가 도2의 b에서와 같이 후진압 포트(40)를 통해 어큐믈레이터(34)로 공급되어 안정적으로 제어되는 것이다.When the operating pressure is supplied to the forward clutch C to move forward by the above configuration, a part of the operating pressure is supplied to the accumulator 34 through the forward pressure port 38 as shown in FIG. When the operating pressure is supplied to the reverse brake (B) for backward movement, a part of the operating pressure is stably supplied to the accumulator 34 through the reverse pressure port 40 as shown in b of FIG. It is controlled.

이상에서와 같이 본 발명에 의하면, 기존의 셔틀밸브를 삭제하고, 양방향 어 큐믈레이터를 적용하여 셔틀밸브의 시일링에 의한 문제 발생을 제거함으로써, 변속감 향상 및 변속충격을 완화하여 무단 변속기에 대한 신뢰성과 안정성을 확보할 수 있는 발명인 것이다.As described above, according to the present invention, by eliminating the existing shuttle valve, by applying the two-way accumulator to eliminate the problem caused by the sealing of the shuttle valve, to improve the transmission feeling and to reduce the shift shock reliability to the continuously variable transmission It is an invention that can secure the stability.

Claims (4)

다수의 스풀 밸브를 보유하면서 오일펌프로부터 압송되는 유압을 프라이머리 풀리와 세컨들리 풀리에 공급하여 직경 변위에 따라 무단으로 변속이 이루어지도록 함과 동시에 전진시 작동하는 포워드 클러치와 후진시 작동하는 리버스 브레이크에 공급되는 유압을 제어할 수 있도록 구성되는 차량용 무단 변속기의 유압 제어시스템에 있어서, It has a large number of spool valves and supplies hydraulic pressure pumped from the oil pump to the primary pulley and the secondary pulley so that the shifting can be carried out steplessly according to the displacement of the diameter, while the forward clutch operates in the forward direction and the reverse brake operates in the reverse direction. In the hydraulic control system of a continuously variable transmission for a vehicle configured to control the hydraulic pressure supplied to, 상기 포워드 클러치와 리버스 브레이크의 작동압 관로 사이에 양 관로를 통해 공급되는 유압을 안정화시킬 수 있도록 양방향 어큐믈레이터를 배치하여 이루어짐을 특징으로 하는 차량용 무단 변속기의 유압 제어시스템.And a two-way accumulator disposed between the forward clutch and the operating pressure pipeline of the reverse brake to stabilize the hydraulic pressure supplied through both pipelines. 제1항에 있어서, 양 방향 어큐믈레터는 양측단부에 포트를 형성하여 일측 포트는 상기 포워드 클러치의 관로와 연통되고, 타측 포트는 리버스 브레이크의 관로와 연통되는 케이스와;2. The apparatus of claim 1, wherein the two-way accumulator has ports formed at both ends thereof so that one port communicates with the forward clutch pipeline and the other port communicates with the reverse brake pipeline; 상기 케이스의 내부에 내장되어 양측으로 각각 탄성부재가 배치되는 피스톤을 포함하여 이루어짐을 특징으로 하는 차량용 무단 변속기의 유압 제어시스템.The hydraulic control system of a continuously variable transmission for a vehicle, characterized in that it comprises a piston which is built in the case and the elastic member is disposed on both sides. 제1항 또는 제2항에 있어서, 양방향 어큐믈레이터의 피스톤 양측으로 배치되는 탄성부재는 탄성력이 서로 다르게 설정된 것을 특징으로 하는 차량용 무단 변속기의 유압 제어시스템.The hydraulic control system of claim 1 or 2, wherein the elastic members disposed on both sides of the piston of the bidirectional accumulator have different elastic forces. 삭제delete
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KR100901579B1 (en) * 2007-05-23 2009-06-08 현대자동차주식회사 Accumulator for line pressure
JP6187914B2 (en) * 2014-04-23 2017-08-30 本田技研工業株式会社 Toroidal continuously variable transmission

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