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The paper describes the results of design and production of new generation valve drives for oil and gas machinery. The drives are based on the use of pan precess gear. The gear has a high performance coefficient (88…90%), smooth operation, low starting torque and ability to remain functioning even under severe conditions of operation. Basic dependencies for geometric calculation of the gear are showed. The problem of synthesizing geometric parameters of the gear as well as calculating parameters and settings of tools (circular cutting heads) and gear-cutting machines has been solved. The results of synthesizing the gear geometric parameters according to the size and shape of the contact pattern are showed. Methods of calculating pan precess gear loading have been developed considering multiple contact of teeth in meshing. The manufactured drives for valves and reduction valves used in progressive cavity pumps for heavy oil production are presented.

Abstract. The aim of this paper is to analyse the semi-rolling bevel precessional gear with straight teeth. The given method of cutting pinion and gear teeth significantly simplifies its manufacture technology. Authors have given a system of equations to study the analysis of generating pinion tooth surfaces and geometry of meshing for semi-rolling bevel precessional gear with straight teeth. A computer program was developed to enable implement formulas provided in the paper. By using this program authors obtained contact lines on the pinion tooth surface and number of tooth pairs in gears mesh. IntroductionThe process of generation of a bevel gear [1,2,3] in comparison with cylindrical and worm (spiroid [4]) gears is more difficult. During the last decades, many papers [5, 6,7] have been directed to the determination the optimal geometry of bevel gears which provide the required loading capacity for operating conditions. So we propose to use gearboxes based on bevel precessional gear (figure 1). Bevel precessional gears are applied in compact gearboxes for oil-and-gas equipment for transmitting rotation and torque [8,9]. The most important characteristics for the quality of bevel precessional gearboxes are efficiency (about 0.9), wide range of gear ratios, low staring torque which is crucial for wide range of operating temperatures [8,9]. Currently, the most fully researched bevel precessional gears are those with double-concave and double-convex teeth [8,9]. The process of gear cutting in not only labor-intensive technology, but also is incredibly complex. It requires four re-settings of the cutting machine, as each tooth surface is cut separately. In this article we study semi-rolling bevel precessional gears with straight teeth. Despite the absence of localized contact in the studied gear, as a result of multiple teeth contact, it is rival product while manufacturing high-loaded gearboxes which operating under low angular velocity and short term duty.

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