气门

With the map for example, we can obtained following conclusions: the cam turning speed has the most direct influence to the dynamics of valve rain; the cam profilers has also a very important influence, the cam profiler as the kind of compound pendulum dose not suit to high speed engine's valve train and the polydyne cam's characteristics is very different from compound pendulum cam's.

论文还首次利用多质量模型的特点对气门落座速度、气门落座冲击力及落座反跳等气门落座特性参数随凸轮轴转速和结构参数的变化规律进行了研究，考察了不同凸轮型线对上述特性参数的影响。对气门落座特性参数进行这样详细和全面的研究，是本论文的开创性工作之一，在其他的文献中尚未见相同报导。

"That is to say, each cylinder has two valves, an intake valve and exhaust valve."

也就是说，每个气缸有两个气门，即进气门和排气门。

"That is to say, each cylinder has two valve s, an intake valve and exhaust valve ."

也就是说，每个气缸有两个气门，即进气门和排气门。

The results show that the exhaust valve lift has greater effect on IMEP than the intake valve lift.

结果表明，排气门升程对平均指示压力的影响比进气门升程要大，较大的排气门升程有利于大负荷工况，在大进气门升程时，由于进气回流导致负荷减少。

Supplies the engine pure part: The piston unit, the connecting rod, the crank module, the piston curl, the connecting rod tile, the host axle bush, stop push around the piece, the crank the oil seal, the cylinder bed, the oil sump filling piece, the gear room filling piece, the water pump filling piece, to enter the exhaust gate, the valve-seat ring, the air valve guide, the tire valve oil seal, the fuel pump unit, the plunger matching part, the bean matching part, the turbosupercharger, the cylinder cover unit, the crank case body, filters, Chai Lv, the generator, the generator, the water pump, the water pipe spatially and so on.

供应发动机纯正部件：活塞总成、连杆、曲轴组件、活塞环、连杆瓦、主轴瓦、止推片、曲轴前后油封、缸床、油底壳垫片、齿轮室垫片、水泵垫片、进排气门、气门座圈、气门导管、气门油封、燃油泵总成、柱塞偶件、喷油嘴偶件、涡轮增压器，气缸盖总成，曲轴箱体，空滤、柴滤、发电机、起动机、水泵、水管等。

Camshaftless valve actuation includes electromagnetic,electrohydraulic,electropneumatic and electromechanical types.it could vary valve timing agilely,simplify the engine's structure,deactivate some of the engine's cylinders selectively and vary the effective compression ratio flexibly to adapt different fuels.So it could offer more advantages than general variable valve timing.

阐述了在发动机上以电磁、电液、电气或其他方式驱动气门，实现无凸轮轴气门驱动，可以灵活改变气门正时，简化发动机结构，能有选择地闭缸，灵活改变发动机有效压缩比以适应多种燃料要求，使发动机获得比采用一般可变气门驱动更多的好处。

In order to study the intake air flow characteristics in four-valve diesel engines, in this dissertation hot-wire anemometer and PIV twodimension instantaneous measuring technique are used. Extensive experimental study on two intake valve exit flow fields and longitudinal section flow field in cylinder are performed for different type of diesel engines. Great researching progress have been made on the interaction between two intake ports, and the formation process of in-cylinder swirl and flow field structure of cross and longitudinal section for four valve diesel engines. These results are presented in China for the first time and without such kind of research work reported abroad as detailed and deepgoing as this dissertation. The author designs and makes a set of hot wire measuring velocity device to measure the velocity distribution around the intake valve annulus and the cross section flow field in cylinder.

为了研究四气门柴油机进气过程中气体流动的变化规律，本文利用热线测速和PIV二维瞬态测速技术，对四气门柴油机两进气门出口全圆周流速场和缸内横、纵剖面的气体流动流场进行了大量的试验研究，在四气门柴油机两进气道之间相互影响的变化规律，缸内涡流的形成过程及缸内横、纵剖面流场结构等方面取得了重大的研究进展，这一研究工作在国内尚属首次，在国外也未见有如此全面、深入的研究报道。

The machining of valve guider and valve set is one of the key process in production of engine cylinder-head.Arming at the precision finishing of valve guider and valve set,a special compound deep-hole cutting tool was designed and made out.

发动机气门导管孔和气门座圈的加工是发动机缸盖加工的关键工艺之一，针对气门导管孔与气门座圈的精密加工，设计制造了专用的复合深孔加工刀具，介绍了该刀具的结构与加工原理，并在试验的基础上优选了加工刀片材料，设计了加工刀片的结构参数。

A lot of variable valve systemshave been developed to adjust valve timing, lift, opening duration and velocity.

根据对气门正时、气门升程、气门开启持续期及气门动作速度等参数进行调节的方式，对发动机各种可变气门系统进行了分类，介绍了不同系统的组成、工作原理及其特点。

I plant's main products are machine-139 F, 142F, 152F, 154F, 168F, 173F, 182F, 188F, E40, E43, C62, C63, C64, C65, 1P60, 1P61, 1P64, 1P65, 1P68, 1P70, 2V77, 2V90, T02-aircraft piston pin, valve spring, with valve tappet, throttle governor stalk, the throttle lever, the exhaust valve adjustment cap, the combination valve putt; And motorcycle engine camshaft CG125-core, under the rocker shaft, the pressure of sales, output shaft, the putt.

我厂的主要产品有通机139F、142F、152F、154F、168F、173F、182F、188F、E40、E43、C62、C63、C64、C65、1P60、1P61、1P64、1P65、1P68、1P70、2V77、2V90、T02通机活塞销、气门弹簧座、气门挺柱、油门调速柄、油门操纵杆、排气门调节帽、气门推杆组合；及摩托车发动机CG125型凸轮轴芯、下摇臂轴、压销体、输出轴、推杆。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐