Search for dissertations about: "TRANSMISSION gears"

Showing result 16 - 20 of 26 swedish dissertations containing the words TRANSMISSION gears.

  2. 16. Continuously Variable Split-Power Transmissions with Several Modes

    Author : Per Mattsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; continuously variable transmission; variator; speed ratio range; ratio coverage; traction drive; mode shift; CVT; planetary gear; power split; IVT; infinitely variable transmission; epicyclic gear train; hydrostatic variator;

    Abstract : A continuously variable transmission (CVT) of split-power design consists of a variator and an arrangement of planetary gears. A black box model describing such transmissions is presented. The model can be used for synthesis as well as loss-free analysis of split-power CVT concepts in general. READ MORE

  4. 17. Efficiency and wear properties of spur gears made of powder metallurgy materials

    Author : Li Xinmin; Ulf Olofsson; Giovanni Straffelini; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Powder Metallurgy Gears; Efficiency; Wear; Friction; Porosity Structure; FZG gear test rig; Machine Design; Maskinkonstruktion;

    Abstract : Powder metallurgy (PM) is usually used in manufacturing parts with complex geometries, such as gears and structural parts. The main attractions of PM are the high rate of material utilization, environmental friendliness of production, economic advantages (especially for complex geometries), and possibility of obtaining lighter components. READ MORE

  5. 18. Influence of running-in on gear efficiency

    Author : Sören Sjöberg; Ulf Olofsson; Björklund Stefan; Lehtovaara Arto; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gears; gear manufacturing; running-in; efficiency; friction; surface topography; Machine Design; Maskinkonstruktion;

    Abstract : The general trend in gear industry is an increased focus on gear transmission efficiency. This thesis focuses on the understanding of how different gear manufacturing methods – particularly the contribution of the running-in process – affect the surface characteristics and friction response, with the purpose of increasing gearbox efficiency. READ MORE

  6. 19. Fuel Optimal Powertrain Control for Heavy Trucks Utilizing Look Ahead

    Author : Maria Ivarsson; Lars Nielsen; Jan Åslund; Jan Wikander; Linköpings universitet; []
    Keywords : TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : The road topography in highways affects the powertrain control of a heavy truck substantially since the engine power is low in relation to the vehicle weight. In large road gradients constant speed is not possible to keep, which would have been beneficial otherwise, and in some uphills shifting gears becomes inevitable. READ MORE

  7. 20. A Comparative Investigation of Gear Performance BetweenWrought and Sintered Powder Metallurgical Steel : Utilizing In-situ Surface Profile Measurements to Investigate theInitiation and Evolution of Micropitting and Pitting Damage

    Author : Edwin Bergstedt; Ulf Olofsson; Bengt-Göran Rosén; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gear testing; Micropitting; Pitting; Efficiency; Surface transformation; Kugghjulstestning; Micropitting; Pitting; Effektivitetsmätning; Yttransformationer; Machine Design; Maskinkonstruktion;

    Abstract : Vehicle electrification is a strong trend that introduces new challenges, such as increased input speed of the transmission and increased power density. Alsothe noise emittance of the gearbox is of increasing importance, as the sound of the gearbox is no longer masked by the internal combustion engine. READ MORE