控制进气门关闭角的液压阀 Intake valve closing angle control hydraulic valve
本实用新型涉及一种用于内燃机可变配气机构中控制进气门关闭角的液压阀。 The present invention relates to a variable valve mechanism in an internal combustion engine intake valve closing angle of the hydraulic valve.
目前，大多数内燃机采用传统的固定式配气机构，因而不能兼顾发动机高速和低速的需要，制约了内燃机的动力经济性，为了提高发动机的动力性，要求在所有转速下气缸内充进尽可能多的空气油汽混合气，在低速进、排气延续角应小些；而在高速应该大些，这就要求气阀早开、晚关，不同转速对配气机构的要求是不同的，国外研制应用的四气门(或多气门)发动机一般采用双凸轮轴来满足高、低速对气阀升程及配气相位的要求和控制，而对于国内生产的两气门发动机，进、排气阀共用一个凸轮轴，配气相位较难分别给以控制，因此研究设计一种适用的可变配气机构是我们需要解决的问题。 Currently, most of the traditional internal combustion engine stationary valve means, and therefore can not take into account the need for high and low speed of the engine, the engine restricts the power economy, in order to increase the engine power, as required charge into the cylinder at all rotational speed much air oil vapor mixed gas at a low speed, the exhaust gas continues to be smaller angle; but should be larger in a high speed, which requires the valve to open early, late off, speed requirements for different valve mechanism is different, development of four-valve foreign applications (or valve) of the engine with dual camshafts generally to meet the high, low and on the valve lift and valve timing control requirements, and for the domestic production of two-valve engine, the intake, exhaust valves a common camshaft, the valve timing control is difficult to give, respectively, the study design a suitable variable valve mechanism is that we need to solve the problem.
本实有新型的任务是设计一种用于内燃机可变配气机构中控制进气门关闭角的液压阀，它可方便地实现改变气阀下降速度、升程曲线，使发动机在整个转速范围内充气系数得到改善，而提高内燃机动力，经济综合性能。 This has the real task is to design a new type of internal combustion engine valve mechanism for variably controlling the intake valve closing angle of the hydraulic valve, which can easily achieve the lowering speed changing valve, the lift curve of the engine over the entire speed range within the volumetric efficiency is improved, while improving engine power, overall economic performance.
为解决上述任务，本实用新型采用如下技术方案：对安装在内燃机上配气机构的推杆与凸轮间的液压阀，含有挺柱，它的阀体分为上、下油腔(A、B)，在B腔上设有供油道在上下油腔的隔板上设有一个单向阀、一个节流孔及一个旁通孔来连接控制上、下油腔的工作状态，阀体内的上、下油腔由供油道充满压力油，工作时在凸轮上升段，挺柱上行将下腔油经由单向阀压入上腔，使输出活塞上升，气门开启，即气门程曲线上升段按凸轮型线变化，在凸轮下降段单向阀关闭，推杆在气门弹簧力作用下推动活塞下行，上腔油经由节流孔流入下腔，节流孔可由控制杆转动控制阀改变流通截面积，即可改变上腔油流入下腔的速度从而改变活塞下行的速度，进而达到气门关闭角改变的目的，增设旁通孔以加快活塞下行速度，在凸轮下降段开始时旁通孔不通，上腔油 To solve the above task, the present invention adopts the following technical scheme: the valve between the hydraulic ram and the cam mechanism is mounted on an internal combustion engine, comprising a tappet, which is divided into the valve body, an oil chamber (A, B ), chamber B is provided on the oil supply path is provided with one-way valve on the upper and lower oil chamber of the separator, and an orifice connected to a bypass hole to control the working state of the oil chamber, the valve body upper and lower oil chamber filled with pressurized oil supply path, the rising section of the cam operation, the column line will quite lower chamber into the upper oil chamber via a check valve, the output piston rises, the valve opening, i.e., the valve lift profile rising section by cam profile changes, falling section of the cam check valve is closed, the push rod pushing the piston downward spring force in the valve, the oil flows into the chamber through the chamber orifice, the orifice control valve by the control lever is rotated to change the flow cross sectional area, can change the speed of the oil flows into the lower chamber of the chamber to vary the speed of the piston down, the valve closing angle is changed so as to achieve the purpose, an additional bypass hole to accelerate the speed of the piston down, falling section of the cam at the beginning of the bypass hole nowhere, the oil chamber 能由节流孔流入下腔，因此可将节流孔调得很小，使活塞下行速率很很慢，因而使气门处于大开度的时间延长，在活塞下降一段很小距离后，旁通孔打开，上、下油腔间通道畅通，活塞便迅速下降，加快气门关闭速度，使整条气门升程曲线丰满系数提高，在挺柱即将与凸轮接触，即气门落到离座前很小的距离时，旁通孔关闭，此时上腔油又只能从节流孔流入下腔，流动阻力急剧增加，气门弹簧力又在减小，从而造成活塞速度迅速下降，最后以很低速度平稳地落在凸轮基园上实现后期缓冲，使液压阀结构满足控制进气门关闭角的需要。 Can flow into the lower chamber from the orifice, the orifice may be adjusted so to be small, so that the piston down rate is very slow, and thus a large degree of the valve opening time is prolonged, decrease some small distance of the piston, the bypass hole is opened, on the flow passage between the oil chamber, the piston will fall rapidly accelerate the valve closing speed, so that the entire valve lift curve coefficient increased fullness, coming in contact with the cam tappet, i.e., before the valve is unseated a small fall when the distance, the bypass hole is closed, and at this time the oil flow only into the upper chamber from the lower chamber orifice, a sharp increase in flow resistance, and the valve spring force is reduced, resulting in a decline rapidly piston speed, at a very low speed and finally fall smoothly on the cam post yl Park buffer implemented, the hydraulic control valve structure to meet the needs of the intake valve closing angle.
由于本实用新型采用上述技术方案，液压阀合理地设计了单向阀，节流孔及旁通孔连接控制上、下油腔的工作状态，结构简单，易于制造安装，即可方便地实现内燃机配气相的位的改变，控制进气门关闭角达到改善充气系数通过计算机模拟优化计算表明，所选用的BN492QE型汽油机，功率、扭矩可提高5-7％达到预期控制目的。 Since the present invention adopts the above technical solution, the rational design of hydraulic valve check valve, and a bypass orifice hole connection control, the working oil chamber in the state of simple structure, easy to manufacture and installation, the internal combustion engine can be easily achieved changing bit with the gas phase, the intake valve closing angle as to improve volumetric efficiency optimization by computer simulation showed that the chosen BN492QE gasoline engine, power, torque can be increased 5-7% to achieve the desired control purposes.
以下结合附图和实施例进一步说明，附图1为本实用新型---控制进气门关闭角的液压阀结构剖视图，由图1可见一种控制进气门关闭角的液压线由阀体(2)、控制杆(3)、节流孔(4)、控制阀(5)、供油道(6)、输出活塞(8)、泄漏孔(11)组成，这是实施例一种顶置气门、下置凸轮轴的BN492QE型汽油机(ZL94206401.1)上控制进气门关闭角的液压阀，安装在内燃机配气机构的推杆(1)与凸轮(12)之间，含有挺柱(7)，它的阀体(2)分为上、下两个油腔(A、B)，经由供油道(6)充满压力油，设有一个单向阀(10)、一个节流孔(4)，和一个旁通孔(9)连接控制上、下油腔(A、B)的工作状态，节流孔(4)设有控制杆(3)和控制阀(5)，节流孔可由控制杆(3)转动控制阀(5)改变流通截面积，即可改变输出活塞(8)下行速度，在输出活塞(8)下行一段很小距离后，连接上、下油腔(A、B)设有旁通孔(9)被挺柱(7)打开，使 In conjunction with the accompanying drawings and the following examples further illustrate, Figure 1 hydraulic valve arrangement of the present invention controls the intake valve closing angle --- sectional view seen from Figure 1 for controlling the intake valve closing angle of a valve of the hydraulic line (2), the control lever (3), the orifice (4), the control valve (5), supply channel (6), the output piston (8), the leak hole (11) composition, which is an embodiment of a top -valve, control underlying BN492QE gasoline engine camshaft (ZL94206401.1) hydraulic valve intake valve closing angle, mounting rod (1) and the cam (12) between the tappet comprising an internal combustion engine valve mechanism (7), which valve body (2) is divided into two upper and lower oil chambers (a, B), filled with pressure oil through the oil supply passage (6), is provided with a check valve (10), a throttling hole (4), and a bypass hole (9) is connected to the control, the lower oil chamber (a, B) of the operating state of the orifice (4) provided with a control lever (3) and the control valve (5), section orifice by the control lever (3) rotating control valve (5) to change the flow cross sectional area, to change the output piston (8) downstream speed, after the output piston (8) a small distance downstream section, connecting the upper and lower oil chambers ( A, B) a bypass aperture (9) is a tappet (7) open, so that 、下油腔(A、B)间通道畅通，油流阻力减小，输出活塞(8)迅速下降，加速气门关闭速度，在挺柱(7)即将与凸轮(12)接触前，旁通孔(9)关闭，使油流阻力骤增，最后以低速平稳地落在凸轮(12)基圆上，通过合理设计液压阀控制进气门关闭角对发动机整个转速范围内充气系数改善，动力经济性有效提高，对实施例BN492QE型汽油机在液压阀控制下的性能计算与原有配气机构参数时的结果对照如下表： Between the oil chamber (A, B) unobstructed, the oil flow resistance is reduced, the output piston (8) decreased rapidly accelerate the valve closing speed, i.e. the cam (12) prior to contacting the bypass hole tappet (7) (9) is closed, the oil flow resistance surge, smoothly falls at a low speed and finally cams (12) on the base circle, closing angle proper design of hydraulic valve controlling the intake valve of the engine over the entire speed range to improve volumetric efficiency, the power economy effectively improve the properties of the results of Examples BN492QE gasoline engine performance calculation when the hydraulic valve control valve mechanism and the original parameters of the embodiment controls the following table:
通过以上模拟计算，可知通过液压阀控制进气门关闭角可以提高发动机的动力经济性，使纸负荷运行稳定性和排放改善。 By the above simulation, the intake valve closing angle can be found to improve the power economy of the engine, the load operation to improve stability and discharge the paper through a hydraulic valve control.