This master thesis was conducted at Volvo Construction Equipment at the cabs department in Eskilstuna, Sweden. The work comprises 30 credits and was carried out by Dennis Björnberg from Mälardalen University during the fall 2015. Volvo Construction Equipment is one of the largest manufacturers of construction equipment and among their products are wheel loaders. The assignment involves an investigation and evaluation of today’s windshield and wiper system for large wheel loader which is in need of improvements as today’s solution has reliability issues. As a result the cab department wants new concepts and solution for next generation of wheel loader that considers the current solution issues. This project aims to develop new concepts which answer the research questions developed to guide the project. The executed development process consists of three phases; problem formulation, concept development and finally product development. The first phase, problem formulation involves literature studies, project definition and demand specifications to formulate and guide the project in the right direction. The second phase develops primary concepts and comparisons with competitors and other solutions in a benchmarking leading to a development of the final concept in phase three. The development process resulted in a wide concept solution consisting of a new shaped windshield, a wiper system adjusted to the new windshield and with new frameless wiper blades, a conceptual pneumatic air system to investigate if an air barrier can keep the windshield clean and a recommendation regarding hydrophobic coatings for windshield´s. The development process resulted in a concept proposing a new shaped windshield system where the side sections is curved for a smooth transition between the sections and a modified wiper system with a wider wiping angle and more square The conclusion drawn from the project it that it is possible to improve today’s solution to develop new conceptual solutions but almost all the performance originates from the windshield´s shape and curvature. The recommendations include among others to further investigate the windshield´s shape and it effects in the wiper system, develop prototypes to further investigates the efficiency of a pneumatic system in dry environments as a replacement for wiping without fluids and to watch the development of new hydrophobic materials and coatings with better durability and lifetime.

Diplomová práca, ktorá vznikla v spolupráci so spoločnosťou AUFEER DESIGN (AFD), sa zaoberá analýzou konkrétneho stieračového mechanizmu automobilu. Najprv je uvedená stručná história stieračov. Stieracie sústavy sú potom rozdelené podľa ich usporiadania a spôsobu pohonu. V nasledujúcej kapitole je formulovaná problémová situácia, problém a systém podstatných veličín. Kinematické veličiny kľúčových bodov mechanizmu sú určené analytickým aj numerickým prístupom. Výpočtový model pre kinematickú analýzu je vyvinutý v Matlabe a SimMechanics. Ďalšia časť je venovaná vytváraniu konečno-prvkového modelu v programe ANSA. Všetky deformačne-napäťové analýzy sú vykonané v programe Abaqus. Prvá z nich je parametrická štúdia, ktorá odhaľuje kritické polohy mechanizmu z hľadiska tlakového namáhania určitých súčastí. Mechanizmus v kritických polohách je potom zaťažovaný so zablokovanými ramenami stieračov. Nakoniec sú urobené lineárne analýzy straty vzpernej stability súčastí, u ktorých môže nastať, nasledované nelineárnymi analýzami so zahrnutými imperfekciami.

Direct current motors and stepping motors are very often used for electric drives in cars. The most frequent representatives of direct current motors are electric starter and wind- screen wiper motor. Stepping motors are very often used for electric regulating of outsides driving mirrors and seats. This study is focused on innovation and DC permanent magnet motor. The disadvanage of direct current motors is so called „sliding contact“. A possible compensation of direct current motor are EC (electronically commutator) motors that do not need sliding contact for their work.

Electric drives used in automotive industry are often based on standard DC motor as it is widely recognised as mature and reliable technology. The most common applications of DC motors in automotive industry are starters and wind screen wiper motors. Aim of this thesis is to provide design overview of typical automotive DC motor therefore main parts and features of the machine will be described in detail. Main disadvantage of DC motor is „sliding contact“ between commutator and carbon brushes which introduces source of electromagnetic disturbance and requires regular maintenance. Within this project different aspects of DC motor design and innovation are expected to be tackled including examples of loss calculation.

In this thesis analysis and inovation of electric machines for cars is discused. There are described principles of basics DC and AC electric machines. In detail this thesis deals with small electric machines used in cars. At least, electro motor for wiper is investigated and possibilities of its inovation in different ways are also mantioned.