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Development of Variable Hydraulic Pump
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Since today’s industry is constantly striving to achieve higher efficiency to save both money and the environment, a better solution for rapid flow change in hydraulic systems is investigated. To find inspiration and limitations a thorough study of today’s existing and new advancing pumps is conducted. The two dominating variable piston pumps as well as a new prototype pump is studied in detailed and compared to each other. The focus in this pre-study is the efficiency i.e. to find what is causing the power losses. It is also of highest interest for Bosch Rexroth Mellansel, since they use variable pumps in their drives. There might be room for improvement in their drives, where the efficiency of the pump is a limitation in today’s systems, especially when operating at partial displacement. Bosch Rexroth has found a potential solution to the problem by the idea of using a pump with two cams which can be rapidly phase shifted. A basic concept existed which has been evaluated to reassure the function of the pump. The results of the master thesis are simulations that can be used to further develop the pump. The simulations are a good basis for future work, i.e. designing a prototype. A solid model has been made of a proposed pump design, which can be an inspiration and basis for the prototype. The most important result of the thesis is the discovery of the many problems that may occur in the pump, from a detailed and a functional point of view. This is of the highest interest when designing a prototype pump, for example does a servo motor with the required performance exist today?

Place, publisher, year, edition, pages
2015. , 47 p.
Keyword [en]
Technology, Hydraulik, pump, variabel
Keyword [sv]
URN: urn:nbn:se:ltu:diva-44410Local ID: 23193eaf-eefb-4431-890f-0a858dcfe62dOAI: diva2:1017688
External cooperation
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20150610 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Berglund, JonasHedman, Jon

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