排序方式： 共有13条查询结果，搜索用时 31 毫秒
1.
2.
3.
椭圆形刀顶对齿根弯曲应力的影响 总被引：3，自引：0，他引：3
着重研究了椭圆形刀顶曲线的形状对齿根弯曲应力的影响，并以减小最大齿根弯曲应力为目标，对椭圆形刀顶曲线的形状参数进行了优化设计。应用边界单元法，分别计算了普通圆弧形刀顶及椭圆形刀顶加工出的齿轮的齿根弯曲应力，应力分析结果表明：使用具有最优参数的椭圆形刀顶的刀具加工出的齿轮，其最大齿根弯曲应力比普通齿轮的最大齿根弯曲应力降低了１０．１％ 相似文献
4.
随着我国工业制造业稳健发展,零部件生产、制造、设计、优化等能力不断提高,其中小模数齿轮轴作为较为重要的齿轮类零部件之一,其加工制造精度关乎该零件所在机械设备的稳定、安全运行成效,目前小模数齿轮轴已经广泛应用在轮船、飞机、汽车等精密仪器中,未来该零部件精度还需不断提高,为此技术人员需在明晰该零部件加工精度提升必要性基础上,分析小模数齿轮轴齿根台阶问题,以期提高该零部件加工制造质量。 相似文献
5.
Zhi-liang Zhang Guo-dong Liu Fu-cang Zhang Cai-xia Zheng Fu-quan Ni Yin-hong Kang Yun Zeng 《林业研究》2014,25(2):365-375
A pot experiment was conducted to investigate the effects of nitrogen content [N1(no fertilizer), N2(0.15 g?kg–1), and N3(0.3 g?kg–1)] on the growth and the hydraulic characteristics of peach seedlings under different soil moisture conditions(W1, W2 and W3, in which the soil water content was 45% to 55%, 60% to 70%, and 75% to 80% of the field water capacity, respectively) by using a specialized high pressure flow meter with a root chamber and a coupling, which was connected to plant organs. Leaf area and leaf hydraulic conductivity(KL) increased significantly in the seedlings because of increased soil moisture and N content. KL increased with leaf area. A linear correlation was documented between KL and leaf area. KL was higher in the morning and began to decline sharply after 16:00, at which KL declined after an initial increase. Soil moisture and N content enhanced shoot(Ks) and root(Kr) hydraulic conductivities, thereby improving the low soil moisture condition to a large extent. Ks and Kr of the seedlings were reduced by 32% and 27% respectively in N1, and by 14.7% and 9.4%, respectively in N2, and both in W1, compared with the control treatment. N3 had no significant effect on Ks and Kr under similar conditions. Linear negative correlations were observed between Kr and the excised root diameter as well as between Ks and the shoot stem diameter. The shoot-to-root ratio increased with increase in N content. The shoot-to-root ratio in N3 was increased by 14.37%, compared with N1 in W1 as well as by 12% and 4.39% in W2 and W3, respectively. Knowledge of the effects of soil moisture and N fertilizer on hydraulic characteristics and growth is important. Our results provide basic guidelines for the implementation of water-saving irrigation and fertilization management of nursery stock. 相似文献
6.
由于容积式的泵和马达原理相同，因此齿轮泵和齿轮马达的结构基本相同。当压力油从马达的入口输入时，油马达就把液压能转化为机械能，输出扭矩。图2-19是齿轮马达产生转矩的原理图，图中P点为两齿轮的啮合点，假设齿轮的齿高为h，啮合点P到齿根的距离分别为a和b，由于a和b都小于h，所以当压力油作用在齿面上时(如图中箭头所示， 相似文献
7.
犬上颌臼齿瘘管是指上颌臼齿齿周和根尖周脓肿,造成齿根、内眼角下方的脸颊部或鼻窦部出现瘘管。本院接诊的数例病例中,有1例较为典型,由于及时确诊,治疗合理,病犬较快康复。1临床检查患犬,8岁、雌性、西施犬,体重6.6kg,体形适中,右眼内眼角下方皮肤破损,有创液渗出,触诊皮下组织损伤范围较大。口腔流涎,食欲减退。口腔检查,发现右上臼齿表面中间线至牙龈有一层黄灰色牙垢,牙龈色泽无异,臼齿略有松动。麻醉后用探针检查脸部创伤,发现创口宽10mm,较深,形成一个瘘管。2 X光检查将泛影葡胺造影剂注入瘘管,X光摄片显示,瘘管直达上颌臼齿,确诊为… 相似文献
8.
9.
分别采用KISSsoft和有限元软件计算一对渐开线直齿轮副在不同轮缘厚度情况下的齿根应力并进行对比,两者计算结果相差较大,且后者计算的轮缘内侧应力随轮缘厚度的减小而增大。但前者不考虑轮缘厚度系数、齿间载荷分配系数和齿向载荷分布系数换算后的齿根应力与后者计算结果接近。计算结果表明,KISSsoft中轮缘厚度系数就是有限元计算轮缘内侧应力的等效反应,将后者轮缘的失效通过前者齿根应力过大反应出来。该研究提醒设计者优化齿轮轮缘设计,达到提高齿轮强度、寿命的目的。 相似文献
10.
以农用拖拉机为研究对象,基于计算机仿真软件建立了农用拖拉机实际工况的分析模型,为解决拖拉机重载、大功率等使用要求,分析了齿轮承载能力、齿根受力分布等。分析结果表明,农用拖拉机工况复杂,但是拖拉机实际使用过程中安全系数均满足要求,仍能实现安全服役的目的;随着齿轮运转,轮齿齿面受力呈先增大后减小的趋势,且在齿面中间前后达到最大值;齿轮齿根应力分布随着轮齿啮合先增大后减小,最大值出现在齿轮齿宽中间前后。 相似文献