Distinguished with some basic theory and approaches of traditional tooth surface design, the spiral bevel gear with new tooth surface, namely spherical involute tooth surface, is investigated. Firstly, it improved its formational principle based on the spherical involute theory. As a key part, the parametric equation of the generating line was made a detailed derivation. To this end, fast and a...

Throughout the years, various classifications have evolved for the diagnosis of vascular anomalies. However, it remains difficult to classify a number of such lesions. Because all hemangiomas were previously considered to involute, if a lesion with imaging and clinical characteristics of hemangioma does not involute, then there is no subclass in which to classify such a lesion, as reported in o...

Main Outcome Measures: Investigators documented the location, extent, and severity of ROP during serial retinal examinations. The onset of the ROP’s involution was determined from a review of these data, applying a set of predetermined criteria. Results: Acute-phase ROP began to involute at a mean of 38.6 weeks postmenstrual age. In 90% of patients, the ROP began to involute before 44 weeks of ...

In this paper, novel non-involute cylindrical gears are designed based on a curved path of contact. Firstly, parabolic curve is predesigned as the contact gears. Then, tooth profiles calculated using differential geometry and spatial meshing theory. Secondly, three-dimensional models established according to machining simulation. Thirdly, simulation model (including misalignment error longitudi...

Abstract Current challenges for today’s industry are an increase in gear ratio one stage, load capacity as well efficiency compared to standard gears. The tooth profile cylindrical gears is involute. This has certain limits external gearings regarding its geometry, e.g., undercutting and a small radius of curvature near the base circle. Special overcome these offer enormous potential design thr...