WO2017101578A1 - 连续可变气门升程系统及汽车 - Google Patents

连续可变气门升程系统及汽车 Download PDF

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Publication number
WO2017101578A1
WO2017101578A1 PCT/CN2016/102104 CN2016102104W WO2017101578A1 WO 2017101578 A1 WO2017101578 A1 WO 2017101578A1 CN 2016102104 W CN2016102104 W CN 2016102104W WO 2017101578 A1 WO2017101578 A1 WO 2017101578A1
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WO
WIPO (PCT)
Prior art keywords
swing arm
continuously variable
valve lift
lift system
variable valve
Prior art date
Application number
PCT/CN2016/102104
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English (en)
French (fr)
Inventor
练海年
刘巨江
陈良
李钰怀
张宗澜
鲁震
Original Assignee
广州汽车集团股份有限公司
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.)
Filing date
Publication date
Application filed by 广州汽车集团股份有限公司 filed Critical 广州汽车集团股份有限公司
Priority to EP16874636.0A priority Critical patent/EP3392476B1/en
Priority to US15/752,551 priority patent/US10415440B2/en
Publication of WO2017101578A1 publication Critical patent/WO2017101578A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L2013/0084—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by radially displacing the camshaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the present invention relates to the field of vehicle engine technology, and in particular to a continuously variable valve lift system and a vehicle having the valve lift system.
  • the reciprocating internal combustion engine can periodically open and close the valve through the valve driving mechanism, so that the engine can effectively inhale fresh air or combustible mixture and eliminate exhaust gas burning in the cylinder.
  • the valve movement law is solidified, and the valve lift and valve opening duration cannot be adjusted according to the actual operation of the engine.
  • the engine of the vehicle is operated under full working conditions, and it is necessary to balance high-load dynamics and low-load economy in design.
  • the fixed law of valve movement makes the engine only in an optimal state under a certain working condition, and it is impossible to balance the power and economy in most cases.
  • variable valve lift system In order to overcome such defects of the engine, a variable valve lift system is increasingly being applied to the engine.
  • the existing variable valve lift system is complicated in mechanism, the manufacturing process is difficult, and the valve opening duration cannot be adjusted.
  • the present invention provides a continuously variable valve lift system and a vehicle having the valve lift system, which has a simple structure and can adjust the valve lift and the duration of the valve opening.
  • the present invention provides a continuously variable valve lift system including a drive swing arm, a camshaft and a valve mechanism, the valve mechanism including a roller rocker arm and a valve connected to the roller rocker arm, the drive pendulum
  • the arm has a driving curved surface that is in contact with the roller rocker arm to drive the valve to reciprocate
  • the continuously variable valve lift system further includes a control shaft and an adjustment swing arm, the driving swing arm sleeve Provided on the control shaft and swingable around the control shaft, the control shaft is provided with a fixing portion, the fixing portion is fixed on the control shaft, and the adjusting swing arm is connected to the fixing portion And swinging relative to the fixing portion, the adjusting swing arm is disposed between the cam shaft and the driving swing arm, Two sides of the adjusting swing arm are respectively in contact with the cam shaft and the driving swing arm.
  • the continuously variable valve lift system further includes a torsion spring having one end fixed to the engine body and the other end fixed to the driving swing arm.
  • a rotating shaft is mounted on the fixing portion, and the adjusting swing arm is coupled to the rotating shaft to swing the adjusting swing arm about the rotating shaft.
  • the driving curved surface is formed with an idle stroke segment and a driving segment, and the idle stroke segment is a circular arc segment centered on the center of the control shaft.
  • a top of the driving swing arm is provided with a ring, and the ring is sleeved on the control shaft.
  • a escaping port is formed on the ring, and the fixing portion is disposed corresponding to the escaping port and protrudes outward from the escaping port.
  • a first contact surface is formed on a side of the driving swing arm facing the adjusting swing arm
  • a second contact surface is formed on a side of the adjusting swing arm facing the driving swing arm The first contact surface is in contact with the second contact surface.
  • the adjusting swing arm is provided with a roller
  • the cam shaft is provided with a cam
  • the roller forms rolling frictional contact with the cam.
  • the number of the cam, the adjusting swing arm, the driving swing arm and the valve mechanism are two, and each cam, the adjusting swing arm, the driving swing arm and the valve mechanism are correspondingly arranged and constitute a valve adjusting system.
  • the present invention also provides an automobile having the continuously variable valve lift system provided by the present invention.
  • the continuously variable valve lift system provided by the embodiment of the present invention has a simple structure, and the fixing arm is disposed on the control shaft, and the adjusting swing arm is connected with the fixed portion, and the adjustment can be adjusted by rotating the control shaft.
  • the swing arm moves up and down, so that the adjusting swing arm pushes the driving arm to a certain degree of rotation to change the contact point of the roller rocker arm and the driving curved surface, and then changes the valve lift and the valve opening duration, so that the engine is high.
  • Load and low load areas can be used with different valve lifts, taking into account power and fuel economy.
  • FIG. 1 is a schematic perspective structural view of a continuously variable valve lift system according to an embodiment of the present invention.
  • FIG. 2 is a side elevational view showing the continuously variable valve lift system of FIG. 1.
  • FIG. 3 is a schematic view showing the comparison of the continuously variable valve lift system of FIG. 1 when adjusting the valve lift.
  • FIG. 4 is a schematic diagram showing the relationship between the valve lift and the valve timing of the continuously variable valve lift system shown in FIG. 1.
  • the present invention provides a continuously variable valve lift system.
  • 1 is a schematic perspective view of a continuously variable valve lift system according to an embodiment of the present invention
  • FIG. 2 is a side view of the continuously variable valve lift system of FIG. 1 , as shown in FIG. 1 to FIG. 2 .
  • the continuously variable valve lift system provided by the present invention includes a control shaft 10, a drive swing arm 20, an adjustment swing arm 30, a torsion spring 40, a cam shaft 50, and a valve mechanism 60.
  • the valve mechanism 60 includes a roller rocker arm 61 and a valve 62 connected to the roller rocker arm 61.
  • the driving swing arm 20 is sleeved on the control shaft 10 and swings around the control shaft 10.
  • the top of the driving swing arm 20 is a ring 22 for mounting on the control shaft 10 and driving the pendulum
  • the arm 20 is rotatable about the control shaft 10; the intermediate position of the driving swing arm 20 is provided with a first contact surface 25 on a side facing the adjusting swing arm 30, and the first contact surface 25 can be a circular arc surface;
  • the bottom of the 20 is provided with a driving curved surface 21 for driving the valve mechanism 60.
  • the left side of the driving curved surface 21 is a circular arc segment, and the left circular arc segment is formed as an empty stroke section 211 with the center of the control shaft 10 as a center, and the right side of the driving curved surface 21 is driven. It is a drive section 212 for driving the roller rocker arm 61.
  • the drive curved surface 21 is in contact with the roller rocker arm 61.
  • the control shaft 10 is provided with a fixing portion 11 which is fixed to the control shaft 10. Adjusting the swing arm 30 is coupled to the fixed portion 11 and swingable relative to the fixed portion 11.
  • the fixed portion 11 is mounted with a rotating shaft 12, and the top of the adjusting swing arm 30 is coupled to the rotating shaft 12 so that the adjusting swing arm 30 can be wound around the rotating shaft 12 swings.
  • the adjusting swing arm 30 is disposed between the cam shaft 50 and the driving swing arm 20, and the two sides of the adjusting swing arm 30 are in contact with the cam shaft 50 and the driving swing arm 20, respectively.
  • the bottom position of the adjusting swing arm 30 is disposed on a side of the driving swing arm 20, and the second contact surface 31 is a sloped surface.
  • the adjusting swing arm 30 passes through the second contact surface 31 and the driving pendulum.
  • the first contact surface 25 of the arm 20 is in contact.
  • the bottom of the adjustment swing arm 30 is also mounted with a roller 32 for making contact with the camshaft 50.
  • the cam shaft 50 is disposed in parallel with the control shaft 10, and the cam shaft 50 is provided with a cam 51 which forms rolling frictional contact with the roller 32 of the adjusting swing arm 30.
  • the cam shaft 50 can drive the swing arm 20 to swing about the control shaft 10 by adjusting the swing arm 30.
  • the torsion spring 40 is mounted on the control shaft 10, one end of the torsion spring 40 is fixed on the body of the engine, and the other end is fixed on the driving swing arm 20, and the torsion spring 40 is used to assist the driving of the swing arm 20 to return to ensure the driving swing arm 20 and the adjustment swing arm 30 are always in contact.
  • the cam 51 on the cam shaft 50 drives the roller 32 of the adjusting swing arm 30 to fix the adjusting swing arm 30 around the control shaft 10.
  • the portion 11 reciprocates and swings, and the swing arm 30 is driven to drive the swing arm 20 through the contact of the second contact surface 31 with the first contact surface 25 of the driving swing arm 20, so that the driving swing arm 20 reciprocates around the control shaft 10 to drive the swing arm.
  • the valve 62 is driven to reciprocate up and down by the contact of the driving curved surface 21 with the roller rocker arm 61.
  • the valve 62 passes the idle stroke section 211 of the drive curved surface 21, the valve 62 is closed; when the roller rocker arm 61 passes the drive section 212 of the drive curved surface 21, the valve is opened.
  • the torsion spring 40 is mounted on the control shaft 10, one end of the torsion spring 40 is fixed on the body of the engine, and the other end is fixed on the driving swing arm 20 for ensuring that the driving swing arm 20 and the adjusting swing arm 30 are always in contact during the movement. .
  • the continuously variable valve lift system provided by the embodiment of the present invention drives the control shaft 10 to rotate by a motor (not shown) during the adjustment of the valve lift and the valve opening duration, since the adjusting swing arm 30 passes through the rotating shaft 12 and
  • the fixing portion 11 is connected to the control shaft 10, and the fixing portion 11 is fixed on the control shaft 10 and rotates following the control shaft 10.
  • the rotation of the control shaft 10 will drive the adjusting swing arm 30 to move up and down, and when the swing arm 30 is adjusted to move up and down, Will push the swing arm 20 to a certain degree of rotation, Then, the position of the contact point of the driving curved surface 21 and the roller rocker arm 61 is changed, and when the position of the contact point of the driving curved surface 21 and the roller rocker arm 61 is changed, the roller is shaken during the period in which the cam shaft 50 rotates one revolution.
  • the contact position of the arm 61 with the drive section 212 of the drive curved surface 21 and the duration of contact with the idle travel section 211 are both varied, which in turn enables adjustment of the valve lift and valve opening duration.
  • FIG. 4 is a schematic diagram showing the relationship between the valve lift and the valve timing of the continuously variable valve lift system shown in FIG. 1.
  • the abscissa indicates the valve timing
  • the ordinate indicates the valve lift, when the ordinate When it is zero, the difference between the time values represented by the two abscissas is the duration of the valve opening.
  • the duration of the valve opening is also increased.
  • the valve lift is adjusted to reduce the valve lift, the duration of the valve opening is also reduced.
  • the continuously variable valve lift system provided by the embodiment of the present invention can realize continuous adjustment of the valve lift, the valve opening duration, and the valve maximum lift corresponding phase by adjusting the position of the adjusting swing arm 30, which can be balanced.
  • Engine power and economy using the atmospheric door lift in high load areas can increase the maximum torque and maximum power of the engine, and use small valve lift to control the air entering the combustion chamber in the low load area, improve the in-cylinder tumble and optimize combustion. Reduce pumping losses and improve fuel economy.
  • a relief opening 24 is further provided on the ring 22 of the driving swing arm 20, and the fixing portion 11 on the control shaft 10 is disposed corresponding to the avoiding opening 24 and The escape opening 24 protrudes outward.
  • valve mechanism 60 further includes a hydraulic tappet 63 on each side of the roller rocker arm 61, and a hydraulic tappet 63 for automatically adjusting the clearance of the valve 62.
  • the number of the cam 51, the adjusting swing arm 30, the driving swing arm 20 and the valve mechanism 60 on the camshaft 50 are two, each cam 51, the adjusting swing arm 30, the driving swing arm 20 and Gas
  • the door mechanism 60 is correspondingly disposed and constitutes a set of valve adjustment systems.
  • the present invention also provides an automobile having the above-described continuously variable valve lift system.
  • the automobile please refer to the prior art, and details are not described herein again.
  • the continuously variable valve lift system provided by the embodiment of the invention has a simple structure, and the fixed swing portion is arranged on the control shaft, and the adjusting swing arm is connected with the fixed portion, and the swinging control shaft can be used to drive the swing arm to move up and down.
  • the adjustment swing arm pushes the driving swing arm to a certain degree of rotation to change the contact point position between the roller rocker arm and the driving curved surface, and then changes the valve lift and the valve opening duration, so that the engine is in a high load region and a low load. Zones can use different valve lifts, taking into account power and fuel economy.
  • the continuously variable valve lift system provided by the embodiment of the invention has a simple structure, and the fixed swing portion is arranged on the control shaft, and the adjusting swing arm is connected with the fixed portion, and the swinging control shaft can be used to drive the swing arm to move up and down.
  • the adjustment swing arm pushes the driving swing arm to a certain degree of rotation to change the contact point position between the roller rocker arm and the driving curved surface, and then changes the valve lift and the valve opening duration, so that the engine is in a high load region and a low load. Zones can use different valve lifts, taking into account power and fuel economy.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

公开了一种连续可变气门升程系统和包括所述连续可变气门升程系统的汽车。所述连续可变气门升程系统包括驱动摆臂（20）、凸轮轴（50）及气门机构（60），气门机构（60）包括滚子摇臂（61）及与滚子摇臂（61）相连的气门（62），驱动摆臂（20）具有驱动曲面（21），驱动曲面（21）与滚子摇臂（61）接触以驱动气门（62）做往复运动。连续可变气门升程系统还包括控制轴（10）和调节摆臂（30），驱动摆臂（20）套设在控制轴（10）上并可绕控制轴（10）摆动，控制轴（10）上设有固定部（11），固定部（11）固定在控制轴（10）上，调节摆臂（30）连接在固定部（11）上并可相对于固定部（11）摆动，调节摆臂（30）设于凸轮轴（50）与驱动摆臂（20）之间，调节摆臂（30）的两侧分别与凸轮轴（50）和驱动摆臂（20）接触。

Description

连续可变气门升程系统及汽车 技术领域
本发明涉及车辆发动机技术领域，特别是涉及一种连续可变气门升程系统及具有该气门升程系统的汽车。
背景技术
往复式内燃机在工作过程中，能够通过气门驱动机构定时开启和关闭气门，以使发动机能够有效吸入新鲜空气或可燃混合气及排除缸内燃烧的废气。传统的气门驱动机构在设计完成后，气门运动规律就固化下来，气门升程和气门开启的持续期不能根据发动机的实际运行情况进行调节。
车辆的发动机是全工况运行，在设计时就需要兼顾高负荷动力性及低负荷经济性。然而固定的气门运动规律使得发动机只能在某一特定的工况下处于最佳的状态，无法在大多的情况下兼顾动力性及经济性。
为了克服发动机的此种缺陷，可变气门升程系统正在越来越多地应用于发动机中，然而现有的可变气门升程系统机构复杂，制造工艺困难且气门开启持续时间不能调节。
发明内容
有鉴于此，本发明提供一种连续可变气门升程系统及具有该气门升程系统的汽车，其结构简单，可对气门升程及气门开启的持续时间进行调节。
本发明提供了一种连续可变气门升程系统，包括驱动摆臂、凸轮轴及气门机构，所述气门机构包括滚子摇臂及与所述滚子摇臂相连的气门，所述驱动摆臂具有驱动曲面，所述驱动曲面与所述滚子摇臂接触以驱动所述气门做往复运动，所述连续可变气门升程系统还包括控制轴和调节摆臂，所述驱动摆臂套设在所述控制轴上并可绕所述控制轴摆动，所述控制轴上设有固定部，所述固定部固定在所述控制轴上，所述调节摆臂连接在所述固定部上并可相对于所述固定部摆动，所述调节摆臂设于所述凸轮轴与所述驱动摆臂之间， 所述调节摆臂的两侧分别与所述凸轮轴和所述驱动摆臂接触。
进一步地，所述连续可变气门升程系统还包括扭转弹簧，所述扭转弹簧的一端固定在发动机的机体上，另一端固定于所述驱动摆臂上。
进一步地，所述固定部上安装有转轴，所述调节摆臂连接在所述转轴上使所述调节摆臂可绕所述转轴摆动。
进一步地，所述驱动曲面上形成有空行程段及驱动段，所述空行程段为以所述控制轴的中心为圆心的圆弧段。
进一步地，所述驱动摆臂的顶部设有圆环，所述圆环套设于所述控制轴上。
进一步地，所述圆环上形成有避让口，所述固定部对应于所述避让口设置并从所述避让口处向外凸伸出。
进一步地，所述驱动摆臂上于靠向所述调节摆臂的一侧形成有第一接触面，所述调节摆臂上于靠向所述驱动摆臂的一侧形成有第二接触面，所述第一接触面与所述第二接触面接触。
进一步地，所述调节摆臂上设有滚轮，所述凸轮轴上设有凸轮，所述滚轮与所述凸轮形成滚动摩擦接触。
进一步地，所述凸轮、调节摆臂、驱动摆臂及气门机构的数量各为两个，每个凸轮、调节摆臂、驱动摆臂及气门机构相对应设置并构成一套气门调节系统。
本发明还提供了一种汽车，该汽车具有本发明所提供的连续可变气门升程系统。
综上所述，本发明实施例所提供的连续可变气门升程系统，结构简单，通过在控制轴上设置固定部，并将调节摆臂与固定部相连，通过旋转控制轴即可带动调节摆臂上下运动，使调节摆臂推动驱动摆臂发生一定程度的转动，以改变滚子摇臂与驱动曲面的接触点位置，继而改变气门的升程及气门开启的持续时间，使发动机在高负荷区域和低负荷区域可以采用不同的气门升程，兼顾动力性及燃油经济性。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技 术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其他目的、特征和优点能够更明显易懂，以下特举较佳实施例，并配合附图，详细说明如下。
附图概述
图1为本发明实施例提供的连续可变气门升程系统的立体结构示意图。
图2为图1所示连续可变气门升程系统的侧视结构示意图。
图3为图1所示连续可变气门升程系统在调节气门升程时的对比示意图。
图4为图1所示连续可变气门升程系统的气门升程与气门正时的关系曲线示意图。
本发明的较佳实施方式
为更进一步阐述本发明为达成预定发明目的所采取的技术手段及功效，以下结合附图及较佳实施例，详细说明如下。
本发明提供了一种连续可变气门升程系统。图1为本发明实施例提供的连续可变气门升程系统的立体结构示意图，图2为图1所示连续可变气门升程系统的侧视结构示意图，如图1至图2所示，本发明提供的连续可变气门升程系统包括控制轴10、驱动摆臂20、调节摆臂30、扭转弹簧40、凸轮轴50及气门机构60。其中气门机构60包括滚子摇臂61及与滚子摇臂61相连的气门62。
驱动摆臂20套设在控制轴10上并可绕控制轴10摆动，在本实施例中，驱动摆臂20的顶部为圆环22，用于套设安装在控制轴10上并使驱动摆臂20可绕控制轴10旋转；驱动摆臂20的中间位置于靠向调节摆臂30的一侧设有第一接触面25，该第一接触面25可以为一段圆弧面；驱动摆臂20的底部设有用于驱动气门机构60的驱动曲面21，驱动曲面21的左边为一圆弧段，左边圆弧段以控制轴10的中心为圆心形成为空行程段211，驱动曲面21的右边为用于驱动滚子摇臂61的驱动段212。驱动曲面21与滚子摇臂61接触。
控制轴10上设有固定部11，固定部11固定在控制轴10上。调节摆臂 30连接在固定部11上并可相对于固定部11摆动，在本实施例中，固定部11上安装有转轴12，调节摆臂30的顶部连接在转轴12上使调节摆臂30可绕转轴12摆动。调节摆臂30设于凸轮轴50与驱动摆臂20之间，调节摆臂30的两侧分别与凸轮轴50和驱动摆臂20接触。具体地，调节摆臂30的底部位置于靠向驱动摆臂20的一侧设有第二接触面31，第二接触面31可以为斜面，调节摆臂30通过第二接触面31与驱动摆臂20的第一接触面25接触。调节摆臂30的底部还安装有滚轮32，滚轮32用于与凸轮轴50形成接触。
凸轮轴50与控制轴10平行间隔设置，凸轮轴50上设有凸轮51，凸轮51与调节摆臂30的滚轮32形成滚动摩擦接触。凸轮轴50通过调节摆臂30可带动驱动摆臂20绕控制轴10摆动。
扭转弹簧40装配在控制轴10上，扭转弹簧40的一端固定在发动机的机体上，另一端固定在驱动摆臂20上，扭转弹簧40用于辅助驱动摆臂20回位，以确保驱动摆臂20和调节摆臂30始终处于接触状态。
本发明实施例所提供的连续可变气门升程系统在控制气门62开闭时，凸轮轴50上的凸轮51驱动调节摆臂30的滚轮32，使调节摆臂30绕控制轴10上的固定部11往复摆动，同时调节摆臂30通过第二接触面31与驱动摆臂20的第一接触面25的接触带动驱动摆臂20，使驱动摆臂20绕控制轴10往复摆动，驱动摆臂20在往复摆动时，通过驱动曲面21与滚子摇臂61的接触带动气门62做上下的往复运动。当滚子摇臂61经过驱动曲面21的空行程段211时，气门62闭合；当滚子摇臂61经过驱动曲面21的驱动段212时，气门开启。
扭转弹簧40装配在控制轴10上，扭转弹簧40的一端固定在发动机的机体上，另一端固定在驱动摆臂20上，用于保证驱动摆臂20和调节摆臂30在运动过程中始终接触。
本发明实施例提供的连续可变气门升程系统在进行气门升程及气门开启持续时间的调整时，通过电机(图未示)驱动控制轴10转动，由于调节摆臂30是通过转轴12及固定部11与控制轴10相连，固定部11固定在控制轴10上并跟随控制轴10旋转，因此，控制轴10的转动将带动调节摆臂30上下运动，调节摆臂30在上下运动时，会推动驱动摆臂20发生一定程度的转动， 继而改变驱动曲面21与滚子摇臂61的接触点的位置，当驱动曲面21与滚子摇臂61的接触点的位置发生改变时，在凸轮轴50转动一圈的周期内，滚子摇臂61与驱动曲面21的驱动段212的接触位置及与空行程段211接触的持续时间均会发生变化，继而实现对气门升程及气门开启持续时间的调整。具体地，当控制轴10顺时钟旋转时，将带动调节摆臂30向下运动，并推动驱动摆臂20向右摆动，使得气门升程减小(如图3的右图所示)；当控制轴10逆时钟旋转时，将带动调节摆臂30向上运动，并推动驱动摆臂20向左摆动，使得气门升程增加(如图3的左图所示)。
图4为图1所示连续可变气门升程系统的气门升程与气门正时的关系曲线示意图，如图4所示，横坐标表示气门正时，纵坐标表示气门升程，当纵坐标为零时，所对应的两个横坐标表示的时间值之差即为气门开启的持续时间。从图4中可知，当调整气门升程使气门升程增加时，气门开启的持续时间也随之增加。当调整气门升程使气门升程减小时，气门开启的持续时间也随之减小。当气门升程减小时，气门升程的最高点所处的时刻会发生前移(如从图4中的T1移至T2处)，使气门最大升程对应相位也同步可调，可以减少发动机的相位调节器的动作幅度。
因此，本发明实施例提供的连续可变气门升程系统，通过对调节摆臂30的位置调整，可以实现对气门升程、气门开启持续时间、气门最大升程对应相位的连续调节，可以兼顾发动机动力性及经济性，在高负荷区域采用大气门升程可以提升发动机最大扭矩和最大功率，在低负荷区域采用小气门升程控制进入燃烧室的空气，提高缸内滚流，优化燃烧，减小泵气损失，提高燃油经济性。
进一步地，为了使驱动摆臂20与调节摆臂30对应设置，在驱动摆臂20的圆环22上还设有避让口24，控制轴10上的固定部11对应于避让口24设置并从避让口24处向外凸伸出。
进一步地，气门机构60还包括液压挺柱63，气门62及液压挺柱63分别位于滚子摇臂61的两侧，液压挺柱63用于自动调节气门62的间隙。
在本实施例中，凸轮轴50上的凸轮51、调节摆臂30、驱动摆臂20及气门机构60的数量均各为两个，每个凸轮51、调节摆臂30、驱动摆臂20及气 门机构60相对应设置并构成一套气门调节系统。
本发明还提供了一种汽车，该汽车具有上述的连续可变气门升程系统，该汽车的其它技术特征，请参考现有技术，在此不再赘述。
本发明实施例所提供的连续可变气门升程系统，结构简单，通过在控制轴上设置固定部，并将调节摆臂与固定部相连，通过旋转控制轴即可带动调节摆臂上下运动，使调节摆臂推动驱动摆臂发生一定程度的转动，以改变滚子摇臂与驱动曲面的接触点位置，继而改变气门的升程及气门开启的持续时间，使发动机在高负荷区域和低负荷区域可以采用不同的气门升程，兼顾动力性及燃油经济性。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。
工业实用性
本发明实施例所提供的连续可变气门升程系统，结构简单，通过在控制轴上设置固定部，并将调节摆臂与固定部相连，通过旋转控制轴即可带动调节摆臂上下运动，使调节摆臂推动驱动摆臂发生一定程度的转动，以改变滚子摇臂与驱动曲面的接触点位置，继而改变气门的升程及气门开启的持续时间，使发动机在高负荷区域和低负荷区域可以采用不同的气门升程，兼顾动力性及燃油经济性。

Claims (10)

  1. 一种连续可变气门升程系统，包括驱动摆臂(20)、凸轮轴(50)及气门机构(60)，所述气门机构(60)包括滚子摇臂(61)及与所述滚子摇臂(61)相连的气门(62)，所述驱动摆臂(20)具有驱动曲面(21)，所述驱动曲面(21)与所述滚子摇臂(61)接触以驱动所述气门(62)做往复运动，其特征在于：所述连续可变气门升程系统还包括控制轴(10)和调节摆臂(30)，所述驱动摆臂(20)套设在所述控制轴(10)上并可绕所述控制轴(10)摆动，所述控制轴(10)上设有固定部(11)，所述调节摆臂(30)连接在所述固定部(11)上并可相对于所述固定部(11)摆动，所述调节摆臂(30)设于所述凸轮轴(50)与所述驱动摆臂(20)之间，所述调节摆臂(30)的两侧分别与所述凸轮轴(50)和所述驱动摆臂(20)接触。
  2. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述连续可变气门升程系统还包括扭转弹簧(40)，所述扭转弹簧(40)的一端固定在发动机的机体上，另一端固定于所述驱动摆臂(20)上。
  3. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述固定部(11)上安装有转轴(12)，所述调节摆臂(30)连接在所述转轴(12)上使所述调节摆臂(30)可绕所述转轴(12)摆动。
  4. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述驱动曲面(21)上形成有空行程段(211)及驱动段(212)，所述空行程段(211)为以所述控制轴(10)的中心为圆心的圆弧段。
  5. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述驱动摆臂(20)的顶部设有圆环(22)，所述圆环(22)套设于所述控制轴(10)上。
  6. 如权利要求5所述的连续可变气门升程系统，其特征在于：所述圆环(22)上形成有避让口(24)，所述固定部(11)对应于所述避让口(24)设置并从所述避让口(24)处向外凸伸出。
  7. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述驱动摆臂(20)上于靠向所述调节摆臂(30)的一侧形成有第一接触面(25)， 所述调节摆臂(30)上于靠向所述驱动摆臂(20)的一侧形成有第二接触面(31)，所述第一接触面(25)与所述第二接触面(31)接触。
  8. 如权利要求1所述的连续可变气门升程系统，其特征在于：所述调节摆臂(30)上设有滚轮(32)，所述凸轮轴(50)上设有凸轮(51)，所述滚轮(32)与所述凸轮(51)形成滚动摩擦接触。
  9. 如权利要求8所述的连续可变气门升程系统，其特征在于：所述凸轮(51)、调节摆臂(30)、驱动摆臂(20)及气门机构(60)的数量各为两个，每个凸轮(51)、调节摆臂(30)、驱动摆臂(20)及气门机构(60)相对应设置并构成一套气门调节系统。
  10. 一种汽车，其特征在于：包括如权利要求1至9任一项所述的连续可变气门升程系统。
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