Denna rapport behandlar utvecklingen av en lämplig beräkningsmetodik för att dimensionera snäckväxlar anpassade för företaget SMP Parts AB:s tiltrotatorer. Syftet med examensarbetet var att underlätta för SMP att dimensionera nya snäckväxlar för kommande produkter samt att genom en utformad metodik bistå med underlag för deras standardiseringsprocess. Utformningen av beräkningsmetodiken har skett iterativt mellan faktainsamling, beräkning och verifieringsfaser för att uppnå tillräcklig precision för applikationen. Majoriteten av de formler som använts härstammar från ISO standarden 10828 som behandlar geometriska förhållanden för snäckväxlar samt standarden 14521 som behandlar hållfasthetsmässiga egenskaper. Beräkningsmetodiken verifierades gentemot ritningsunderlag för företagets existerande tiltrotatormodeller vilket medför att den kan användas för att ta fram underlag för nya modeller. De hållfasthetsmässiga beräkningarna har inte kunnat verifieras då fullständigt underlag saknas. Trots detta ges en god approximation av hållfastheten då jämförelser av säkerhetsfaktorer mellan de existerande modellerna har utförts. Dessutom har geometrin hos de existerande modellerna verifierats. Arbetet resulterade i en Excelfil som baseras på beräkningsmetodiken vilken täcker in de uppsatta målen för examensarbetet samt tar hänsyn till företagets kravspecifikation. Slutligen tas en diskussion upp angående de approximationer och antaganden som har behövts för att utföra examensarbetet. Detta har ansetts vara viktigt eftersom all nuvarande litteratur om snäckväxlar bygger på en jämn och kontinuerlig drift, vilket inte överensstämmer med användningen av tiltrotatorer som används intermittent. Rapporten innehåller även förslag gällande fortsatt arbete för att uppnå bättre träffsäkerhet i beräkningarna samt utvecklingsmöjligheter för beräkningsmetodiken. / This report covers the development of a calculation methodology for dimensioning of worm gear drives adapted for SMP Parts AB's tiltrotators. The purpose of the thesis was to facilitate SMP in dimensioning new worm gears for future products and to provide support for their standardization process through a designed methodology. The design of the calculation methodology has been done iteratively between data collection, calculation, and verification phases to achieve sufficient precision for the application. The majority of the formulas used originate from ISO standard 10828, which addresses the geometric calculations of worm gears, and standard 14521, which addresses strength properties. The calculation methodology was verified against drawings for the company's existing tiltrotator models, which allows the calculation methodology to be used to provide information for new models. The strength calculations have not been possible to verify due to the lack of complete documentation. However, a good approximation of strength is provided as comparisons of safety factors between the existing models have been performed. Additionally, the geometry of the existing models has been verified. The thesis resulted in an Excel file based on the calculation methodology, which covers the set objectives of the work and considers the company's specification requirements. Finally, a discussion is presented regarding the approximations and assumptions that were necessary to carry out the thesis. This has been considered important because all current literature on worm gears is based on smooth and continuous operation, which does not align with the intermittent use of tiltrotators. The report also includes suggestions for further work to achieve better accuracy in the calculations and development opportunities for the calculation methodology.

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The sideband phenomenon is a common but obscure characteristic of the Rotary Dynamics field. In the automotive industry these sidebands have been found to produce a poor sound quality, resulting in customer dissatisfaction and warranty returns. In the interest of continued product improvement, research and development must resolve uncertainties in the current design methods. Qualitative relationships between the sideband characteristics and design parameters have developed in recent years, but the quantitative goal hasn't been achieved. A Synchronous Sampling (SS) data acquisition system is applied to a helical planetary gear set to improve the understanding of the sideband characteristics and enhance the design process. An optical encoder, a component of the SS system, mechanically locked to the rotating system controls the A/D converter to sample at constant shaft angle increments. The phase-locked nature of SS allows the use of vector averaging to significantly lower the noise floor and improve the representation of the order domain. In this work, the advantages of using a SS system with vector averaging capabilities are compared to the disadvantages of using a fixed sampling (FS) system. Utilizing the SS tool, this work also illustrates the influences of loading styles and values and speed on a gearmesh and its dominant sideband orders. Inspection of these influences suggests an opportunity for future work. / Master of Science