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气门

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Results The anterior spiracle, posterior spiracle and cephalopharyngeal skeleton regularly changed with daily larval growth. The three indexes including the sclerotizes area of pharyngeal sclerite, the average optical density of pharyngeal sclerite and the posterior spiracle could be used as the ideal indexes of larvae age.

结果 丝光绿蝇幼虫前气门、后气门、头咽骨均随着时间的延长发生规律性变化,幼虫后气门平均光密度、咽骨骨化面积及其平均光密度这3项指标是推断幼虫日龄较理想的指标。

While the Fiat, Volkswagen, Renault and Peugeot still employ single cam 2-valve engine of roughly the same size, Toyota has twin cam, 4-valve head, individual coil on spark plug and the VVT-i variable valve timing.

当 菲亚特、大众、雷诺和标致仍然在使用与它大小相当的 2气门单点电喷发动机时,Toyota 已经采用了双点火的、4 气门的、独立点火线圈的和 VVT-i 可变气门技术的发动机。

Although the valve-in-Block arrangement is a simple design. Most automotive engines are the valve-in-head type. The valve-in-head engine has certain advantages.

"虽然侧置气门发动机结构设计简单,大多数汽车发动机却都是顶置式气门,因为顶置式气门发动机确有优点。"

A transient thermal coupling model of certain internal combustion engine exhaust valve train was built, transient thermal-field distribution of the valve was simulated, and the effect of the thermal conductivity to the thermal-field was discussed.

通过建立某发动机排气门组瞬态热分析藕合模型,对排气门进行瞬态温度场有限元模拟,并探讨导热系数对气门温度场的影响。

The calculation results show that the temperature of the valve cone changes periodically, leading to thermal stress changes periodically, which is the main reason of the valve cone pit corrosion; the operating temperature of the valve can be reduced by using the higher thermal conductivity materials; at the Same time, 3-D FEM provides a good theoretical basis in the process of the design and improvement for the parts of ICE.

计算结果表明:气门锥面处周期性的温度变化,会导致周期性变化的热应力,是导致气门锥面疲劳点蚀的主要原因;采用较高导热系数的材料可降低气门的工作温度;同时,三维有限元法能为内燃机零部件的进一步设计改进提供很好的理论依据。

Combined with new tendency and practice in internal combustion engine industry at home and abroad in recent years,this paper suggests that machining cone of intake and exhaust valve seat insert and guide tube hole is the key technique in machining complicated cylider-head.

结合近年来国内外内燃机行业发展的新趋势和工作实践,对结构复杂的气缸盖机械加工提出了进、排气门座圈锥面与导管孔的加工是其工艺技术关键,从定位方式、基准选择、气门座底孔与导管孔底孔的加工,气门座圈锥面加工方式和导管孔的加工方式等方面进行了探讨和分析。

Volute spring series win outstanding new products special awards in 2002 China General Machine Components Industry Association. Steyr valve inside and outside spring of engine, automobile suspension spring, die spring series won the excellent new products prizes. GW2.4S (4G6) valve spring of engine series won outstanding new products special awards in 2003 China General Machine Components Industry Association. Geely MR479Q valve spring of engine, power tool spring, high stress piston pin-spring flange series won excellent prizes meanwhile. Valve spring series won the excellent new products prizes in 2004 China General Machine Components Industry Association. Hydraulic pressure spring won excellent prizes meanwhile.

涡卷弹簧系列荣获2002年中国机械通用零部件行业优秀新产品特等奖;斯太尔发动机气门内、外弹簧、汽车用悬架弹簧、模具强力弹簧系列同时荣获新产品优秀奖;GW2.4S(4G6)气门弹簧系列荣获2003年中国机械通用零部件行业优秀新产品特等奖;吉利MR479Q气门弹簧、电动工具冲击弹簧、高应力活塞销档圈系列同时荣获优秀奖;阀门弹簧和液压弹簧分获2004年中国机械通用零部件工业协会优秀新产品特等奖和优秀奖。

On most engines, this mechanism, called the valve train, includes a cam on the camshaft, a valve lifter, a push rod, and a rocker arm.

在大多数发动机中,这套装置叫做气门机构。这套装置中包括凸轮轴上的一个凸轮、一个气门挺杆、一个气门推杆和一个摇臂。

Through the analysis of intake valve exit three dimensional flow field and its angular momentum flux of four valve diesel engine under different plans, the law of in cylinder air angular momentum flux by the influence of disturbance between two intake ports was discovered.

利用测得的四气门柴油机气门口三维流场,分析了进气门出口流场产生的缸内空气动量矩流率,揭示了四气门柴油机两进气道的相互干扰对缸内空气动量矩流率影响的变化规律。

A spring on the valve stem tends to hold the valve on its seat.

气门杆上的弹簧使气门保持在气门座上。

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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

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。