Abstract
The parameters of the involute and cycloidal gearing which influence on fluid volume at the tooth space are analysed. It is established that to a greater extent on the flow rate of the pump with involute gearing is influenced by the radial clearance coefficient and the profile shift coefficient. The radii ratio of the auxiliary and pitch circles, as well as the radial clearance coefficient, mainly affect the flow rate of the pump with cycloidal gearing. Since the gear module is determined for reasons of pump flow rate, the teeth has a significant safety factor for contact stress and especially bending stress. This allows a wide variation of the gearing parameters in greater limits than in transmissions. The dependences of the fluid volume at the tooth space in the cycloidal gearing on the radial clearance coefficient, on the radii ratio of the auxiliary and pitch circles, on the fillet radius coefficient, is found. The boundaries of the variation of the gearing parameters were established taking into account the bending strength of the teeth. The analysis is carried out using the finite element method. Recommendations for the use of cycloidal gearing in external gear pumps have been developed.
Highlights
Invented more than a century ago, gear pumps are today the most preferred type of pump for working with viscous fluids
The use of cycloidal gearing gear pumps external gearing provides an increase in their performance at a sufficient structural strength
A method for estimating the area of the tooth space was developed to assess the effect of the radial clearance coefficient on the pump flow rate with an involute gearing
Summary
Invented more than a century ago, gear pumps are today the most preferred type of pump for working with viscous fluids (petroleum products, oils, chocolate, etc.). In the case when the pump is used to lubricate viscous fluids, rotation takes place at a low speed and the issue of flow fluctuations is not so important. This makes it possible to use gear pumps with parameters that are not commonly used. The technological limitations that have led to the general use of the involute tooth system vanish [3]. In this regard, the topic of using epicycloids and hypocycloids for tooth profiling is brought forth. The use of cycloidal gearing gear pumps external gearing provides an increase in their performance at a sufficient structural strength
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