Justification techniques for the structure, configuration and parameters of a drivegear with roller drive of increased accuracy and operational reliability selection
Machine-building Engineering and Machine Science
Machine science, drive systems and machinery
Center for exploitation of space ground-based infrastructure - Design Bureau «Motor», 7, Sergey Makeev str., Moscow, 123100, Russia
At present, the requirements placed on power actuators include increase of load capacity, positioning accuracy, reliability, durability, efficiency, impact resistance, and a number of other parameters. The required speeds and accelerations of the output element of the drives are increasing as well. Drives should be easily mounted on the object, replaceable and adjustable. Their servicing should be simple, and their control should be reliable and easily programmable. For most products, especially of the space industry, it is necessary to reduce the weight of the drives and maintenance facilities. The environmental requirements placed on the drives are constantly toughening.
The analysis of the requirements placed on the drives for special aggregates reveals that they should provide:
· Fast response and playback accuracy of a desired motion law;
· High precision of moving;
· Synchronous operation of two or more drives;
· Greater amount (range) of the output element speed control;
· Higher soft ride of large mass products at low (micro) speeds;
· Minimal and stable energy losses values.
In addition to the abovementioned, a power actuator should have a simple technological design, low weight and size, and high operating reliability. Recently, the demand for the planetary roller-type actuators (PRTA) as the actuating mechanism (AM), especially for the military and aviation equipment, increased significantly in our country. A number of companies are trying to master serial production of PRTA, which requires to address the issues of PRTA analysis validation and design, production technology of the actuator parts and their assembly, as well as high-precision metrological control of PRTA parts critical dimensions, using the appropriate equipment.
PRTA has a number of advantages:
· High load capacity;
· The possibility to provide light feed at high load;
· High reliability;
· Low sensitivity to temperature variations;
· Ease of mantling and dismantling of the transmission;
· Ability to work with high rotation speeds;
· High efficiency;
· Low metal consumption.
Based on the conducted studies of mathematical models and well-known techniques [3, 4], a technique for a prospective PRTA AM structure and parameters justification was developed.
To solve such problems, the experts of FSUE «CENKI» — «DB «Motor», MADI and N. E. Bauman MSTU proposed to use the planetary roller-type transmission as the actuating mechanism.
Theoretical and experimental studies under the scientific supervision of Professor A.N. Sova and candidate of technical sciences A.V. Sizanov are conducted on the manufactured friction planetary roller-type transmission 48×12, and the control system on a specialized workbench for transmission running test is prepared.
Research is conducted at the branch office of FSUE «Center for exploitation of space ground-based infrastructure», — «Design Bureau «Motor» using the CNC milling machine Hardinge Bridgeport GX1000. A measuring device is sel ected based on the desired accuracy of transmission. Digital measuring head Mahr Extramess 2000 with permissible error G = 0.6 μ m was used in the study.
Thus, implementation of scientific and methodological approach and the conducted research allow us:
· Take into account the longevity reserves of contact fatigue damage, in-service wear, and quality of the lubricating layer;
· Determine the optimal value of the actuator mass to ensure a pre-set speed without overshoot;
· Reduce deviation of the experimental results fr om theoretical results;
· Develop scientific and methodological support of the results of the machine-aided design of the actuator with high dynamic performance, reliability and durability implemented with CAD/CAM/CAE system.
At present, planetary roller-type transmission is the most promising device that converts rotational motion into linear.
Keywords:drive, roller drive, accuracy increase, design technique, frictional losses, efficiency
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