TECHICAL Series MATHEMATICS  INFORMATICS  PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
About the Determination of the Direct Contact Ratio of the Spur-Gears
(Unele aspecte privind calculul gradului de acoperire frontal la angrenajele cilindrice)
Vol LXIV • No. 2/2012
Niculae Grigore
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucuresti 39, Ploieşti
e-mail: ngrigore@upg-ploiesti.ro

 Keywords   gear, gear wheel, contact ratio, pitch diameter, head or foot diameter, distance between the axes.

 Abstract
Determining the direct contact ratio is an important step in establishing and constructing the spur gears. This paper aims to present the manner in which the direct contact ratio for the spur gears is being determined. We shall refer here in a general and unitary manner to the spur gears with straight and helical teeth, modified or unmodified toothing.

 Rezumat
Definit ca raportul dintre lungimea arcului de angrenare si pasul pe cercul de rostogolire (de divizare), gradul de acoperire constituie un concept fundamental in calculul si constructia angrenajului. Concepută intr-o concepţie unitară si in acelasi timp generală, lucrarea prezintă intr-un mod riguros şi clar calculul gradului de acoperire frontal in cazul angrenajului cilindric cu dinţi drepţi, dantura nemodificată şi modificată. Lucrarea extinde calculul gradului de acoperire frontal şi pentru angrenajele cilindrice cu dinţi inclinaţi, dantura nemodificată şi dantura modificată.



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