越野汽车差速器同步锁止机构套合器齿形加工设计

在充分研究越野汽车差速器同步锁止机构套合器的工作特性及工艺特点的基础上 ,提出了一种新的齿廓结构 ,并根据工件和刀具的运动几何关系 ,给出了刀具的刃形方程及套合器的齿面方程。经验证 ,该齿形完全可以满足系统的工作特性要求 。

越野汽车差速器锁止机构套合器的强度校核

车辆差速器锁止机构自动控制系统(Vehicle Differential Lock System,VDLS)提高了越野汽车在坏路及无路情况下的地面通过性,笔者阐述了VDLS关键部件套合器(Dog clutch)的工作原理、结构特点和设计方法;并利用ANSYS软件建立了套合器的三维有限元模型,根据套合器轮齿可能接触的各个部位,分别进行应力分析,计算得到套合器的应力及应变,对比分析确定最大应力发生部位及其原因,为套合器齿形设计和强度计算提供了可靠的依据。

差速器锁止机构套合器的强度分析

车辆差速器锁止机构自动控制系统(Vehicle Differential Lock System,VDLS)提高了越野汽车在坏路及无路情况下的地面通过性,阐述了VDLS关键部件套合器(Dogclutch)的工作原理、结构特点和设计方法;并运用Pro/E和ANSYS联合建模技术,建立了套合器的三维有限元模型,对套合器进行应力分析,计算得到套合器的应力及应变,并能够准确地揭示受力状态和最大应力发生部位,为套合器齿形设计和强度计算提供了可靠的依据。

汉带流甗形套合器鉴赏与研究

铜甗(yǎn)作为青铜时代的重要礼器,考古发掘出土及传世品很多。滁州市博物馆馆藏一级文物、镇馆之宝汉带流甗形套合器,由于形制比较特殊,吸引了不少文物爱好者的目光。对其铸造工艺、形制、功用等多方面进行分析研究,既可以深入、全面地掌握文物的基本信息,揭示汉代丰富的历史文化内涵,也可以与同时代同类型的典型文物进行对比分析研究,为大众更好地鉴赏文物提供参考,让文物真正地“活”起来。

Treponema pallidum and Haemophilus ducreyi DNA detection by A Multi-Nested Polymerase Chain Reaction

Objectives: To develop a multi-nested polymerase chain reaction in an assay to detect early Treponema pallidum and Haemophilius ducreyi DNA in the swabs of genital ulcers. Methods: Four pairs of outer and inner primers, specific to the basic membrane protein gene of Treponema pallidum and to the 16s rRNA gene of H ducreyi were synthesized. The multi-nested PCR was developed and applied to detect Treponema pallidum and Haemophilus dicreyi in clinical swabs. Result: The two samples of standard strains of Haemophilus ducreyi and one Treponema pallidum were amplified and showed 309-bp rRNA gene of Haemophilus ducreyi and 506-bp DNA of Treponema palidum, respectively. Out of 51 samples of genital ulcer detected, 29 showed Treponema pallidum positive product and no Haemophilus ducreyi DNA was found. Conclusion: The multi-nested PCR for Treponema pallidum and Haemophilus ducreyi could be useful for early detection and distinguishing diagnosis between syphilis and chancroid.