Jarosław Stryczek

A Gear Micropump without Bearings Production

Progress in the field of microelectronics and micromechanics has created new opportunities for the development of fluid power microsystems and microhydraulics. Miniaturization of hydraulic elements allows replacing the classical hydraulics with microhydraulics, where due to size or weight the former cannot be applied. Gear pumps are common use due to their reliability, resistance to working medium impurities, high efficiency, small size in comparison with other pumps and simple and compact design. Therefore micropumps often associate with a gear pump type. A micropump entails microbearings production. This requirement leads to cost increasing due to requirements to high accuracy of manufacturing. The paper focuses on a method for micropumps production without bearings. The idea based on application of materials with satisfactory friction coefficient in pairs. Friction pairs analysis made from different polymer and composite materials was carried out. As a result a gear micropump was designed and produced.

Construction and Experimental Research on Plastic Cycloidal Gears Used in Gerotor Pumps

Paper presents the construction and results of experimental research of gerotor pump with gears made of POM and PPS. Research program included verification of design factors (axial and radial clearance), operational factors (impact of speed, pressure and temperature on the pump characteristics) and definition of durability characteristics. Results of research proves that the pump with gears made of plastics can operate at high speeds (up to 4000 rpm), at temperature of the working fluid in the range 25°C – 50°C, with the working pressure at the outlet of the pump 4 MPa. Presented results of long-term tests, shows that the pump with gears made of plastics worked for 40 hours maintaining a constant level of efficiency Q = 12.5 dm3, which represents 80% of the theoretical volumetric efficiency.Copyright

Designing a Pumping System of Gear Pumps Featuring the Involute Internal Gearing

On the basis of the analysed references it has been shown that an important problem in designing hydraulic machines is to develop a method of designing a pumping system of pumps with the internal gearing, which would integrate designing gears and compenstion elements. The authors of the paper has defined a design algorithm that consists of three basic stages: designing a concept of the system, designing the gear subsystem, and designing the compensation subsystem. The design process at particular stages have been described, and the results have been presented in engineering drawings. An original computer program Internal Pumping Set which enhances the process of designing the pumping system has been created. An application of the program has been presented, and a design of an exemplary pumping system made.

Role of the Machine Design Courses in the Mechatronic Faculty

General assumptions of educational faculties at universities are specified by the instructions of the Polish Ministry of Science and Higher Education. In this paper, educational standards with the focus on the design subjects for the Mechatronic Faculty have been presented. Taking the instructions of the Ministry into account, the Mechanical Faculty of Wroclaw University of Technology has started the faculty. The studies general timetable has been created and discussed, indicating the position and scope of the design subjects in it. A curriculum of the subject concerning mechanical systems design for the studies has been suggested.