齿形

A simple and practical method to reequip the hobbing machine by using CNC system to machine the crown gears is introduced. It has advantages of high machining quality and efficiency, high stability and reliability, simple operation, good adaptability to different lots, easy to realize, low cost and high benefit. It is an economical and efficient technique to machine crown gear. It is of particular extending value, meeting the domestic needs of crown gear coupling manufacturing.

介绍了一种新开发出的简单实用的数控化改造普通滚齿机加工鼓形齿轮的方法，它具有加工质量好、生产效率高、系统稳定可靠、操作简单、产品批量适应性强、改造容易实现、改造成本低、效益高等优点，是一项经济有效的鼓形齿轮加工技术，适合现阶段国内鼓形齿联轴器制造的要求，具有较高的推广应用价值。

The diagnostic features for the species include deep excavation on the posteroventral margin of the premaxilla, a diastema between the premaxillary and maxillary teeth, a a number of many pits and ridges on the anterolateral surface of the antorbital fossa, the posterolateral process of the parietal being long and sharply posteriorly directed, the column ar -like margin of the pterygoid process of the quadrate, the bifurcated posterior margin of the dentary, a distinctive groove posterior to the anterior carina on the medial surface of the premaxillary tooth crowns, absence of ventrolateral processes on intercentrum of t he atlas, T-shaped centrum of the first caudal in ventral view, transverse process on anterior caudals with rounded , and strongly anteroposteriorly expanded distal end, presence of two fossae separated by an oblique ridge on the lateral side of the anterior chevrons near the articular end, and pubis strongly curved psoteriorly.

这一属种的主要鉴定特征包括：前上颌骨后腹缘有一深凹、前上颌齿和上颌齿之间有一齿缺、眶前窝外表面前部有许多坑窝和脊、顶骨侧后突伸向后方、方骨的翼骨支边缘柱状、靠近前上颌齿齿冠舌面前缘有槽、环椎间椎体外腹突缺失、第一尾椎椎体腹视 T 形、前部尾椎横突远端前后向强烈扩展呈圆形、前部脉弧近端外侧面有两个被一斜脊分离的窝以及耻骨强烈向后弯曲。通过分析千禧中国鸟龙的96个骨骼学特征，发现其中21个特征支持奔龙类与鸟类的亲缘关系最近，9个特征支持奔龙类与伤齿龙类亲缘关系最近，25个特征支持奔龙类、伤齿龙类和鸟类亲缘关系较为接近。

Theoretical verification of generating method for grinding of gear involute helicoid;2. This paper proposes a new machining method of dram gear generating method in numerical control chine,which is simple and convenient and can pledge accurate engage gears.

针对鼓形齿常用切削方法中存在的不足，提出了一种在数控机床上用展成法加工鼓形齿的新方法，并对加工过程进行了啮合分析，得出结论：用数控机床只要改变程序便可加工任意齿数的齿轮，并可达到预期精度。

This paper develops a mathematical model for the solution to the longitudinal tooth curve of an internal gear shaver based on the simplified principle for space transmission of a helical gear pair without flank clearance,and proposes a calculating approach of the profile modification of the grinding wheel to be used for grinding the longitudinal tooth curve of the shaver.

用简化的空间螺旋齿轮作无侧隙啮合传动的原理，建立了求解内剃齿刀齿向曲线的数学模型，并给出了修磨这种齿向曲线的盘形砂轮的廓形计算方法。

Repass and other 5 kinds the configuration of frontal flea larva is compared, discovery belongs to frontal flea subgenus number of 5 kinds of larval big gnathic tine are 5 tine commonly, one age larval broken egg implement the larval big jaw that the front belongs to subspecies of otter of ash of flea of forehead of subgenus of bird forehead flea for shoe form; ages number amounts to 9, one age larval broken egg implement the front is bat form.

再通过与其它 5种额蚤幼虫的形态比较，发现属于额蚤亚属 5种幼虫的大颚齿数一般为 5个齿，一龄幼虫的破卵器正面为鞋形；而属于鸟额蚤亚属前额蚤灰獭亚种的幼虫的大颚齿数达 9个，一龄幼虫的破卵器正面为球拍形。

Calyx ovoid to campanulate, declined in fruit, glandular outside, glabrous or occasionally villous at throat inside, limb 2-lipped; upper lip 3-toothed, middle tooth circular to obovate, margin winged, decurrent, lateral teeth shorter; lower lip 2 toothed, teeth narrower, apex acuminate to spinescent, sometimes approximate.

卵球形的花萼到钟状，在果期下弯，在外面具腺，或偶有具长柔毛在喉部在里面，二唇形的瓣片；上唇具3齿，中间齿圆到倒卵形，具翅的边缘，，侧齿短；狭窄下唇2齿，齿，对具刺，有时紧靠的先端渐尖。

Middle tooth of upper lip of calyx wider than lateral teeth, circular-ovate; lateral teeth broadly lanceolate to narrowly triangular.

中间齿的上唇的花萼宽比侧齿，圆卵形；侧的齿宽披针形的到狭三角形。

In order to keep rational radial clearance and decrease the part fit gap, the combined method of positive equidistance plus positive move distance is proposed to modify the cycloid disk tooth profile, so that the processing tooth profile and the rotate angle reparing shape are almost consisitent, and the transmission precision is enhanced.

为了保证合理的径向间隙，减少零件配合的侧隙，通过对摆线轮齿廓采用正等距加正移距的组合方式修形，以保证加工齿廓与转角修形齿廓基本吻合，提高传动精度。

Using the resultant motion of turning motion of rotary table and indexing motion of index head combined with gear contour machining principle.

根据鼓形齿的切削原理，利用回转工作台的回转运动和分度头分齿运动的合成，在立式铣床上加工出齿轮联轴上的鼓形齿，收到了

Stems 18-100(-160) cm tall, well-branched above, densely gray villous on lower part, mixed above with short glandular hairs, often with raised lines decurrent from margins of petioles. Leaves subsessile or lower ones with petioles 1-3 mm; cauline blade lanceolate-elliptic to narrowly lanceolate or oblong-lanceolate, 3-12 × 0.5-2.5 cm, both surfaces villous, base usually rounded, margin denticulate with 15-60 teeth per side, apex subacute.

茎18-100(-160)厘米高，在上面的多分枝，叶近无柄或下部的具叶柄1-3毫米；茎生叶披针形椭圆的到狭披针形或者长圆状披针形， 3-12 * 0.5-2.5 两面，厘米具长柔毛，基部通常圆形，边缘具小齿具齿每边，近尖的先端。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。