Course detail
Hydraulic and Mechnaical Gears
FSI-FHM Acad. year: 2022/2023 Winter semester
The course deals with the following topics: Hydrostatic transmissions: elements of hydrostatic mechanisms – converters, elements for pressure regulation, elements for flow regulation, elements for flow direction regulation, auxiliary elements, proportional elements. Calculation of hydrostatic circuits, starting and braking, thermal balance. Hydrostatic circuits of working machines. Hydrodynamic transmissions: hydrodynamic couplings and hydraulic torque converters.
Language of instruction
Czech
Number of ECTS credits
4
Supervisor
Department
Learning outcomes of the course unit
Students will be acquire knowledge of designing and construction especially of mobile machines from the study program. They will widen and deepen their knowledge of design of regulative hydrostatic circuit, with respect to the latest development trends.
Prerequisites
Successful completion of the course is conditional on the basic knowledge of technical mechanics, physics, machine parts and their mechanisms.
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline. Exercises are focused on practical topics presented in lectures. Teaching is suplemented by practical laboratory work. Part of the course can be excursions to the companies, which manufacture or operate the equipments from the thematic area of education.
Assesment methods and criteria linked to learning outcomes
The exam is written. It consists of an example and theoretical questions. Preparation time is 100 minutes.
Aims
The aim of the course is to widen and deepen students’ knowledge of machine parts and mechanisms and hydraulic machines with respect to the transport technology.
Specification of controlled education, way of implementation and compensation for absences
Course-unit credit is awarded on condition of having attended the seminars actively and completed all tasks and fulfillment of credit of exercise test conditions. Presence in the exercises is obligatory.
The study programmes with the given course
Programme B-STR-P: Engineering, Bachelor's
specialization SSZ: Machine and Equipment Construction, compulsory
Type of course unit
Lecture
39 hours, optionally
Teacher / Lecturer
Syllabus
1. Theory of hydrostatic mechanisms, continuity equation, Bernoullis relation.
2. Hydraulic resistances in the hydrostatic mechanisms.
3. Transmission of pressure energy in the hydrostatic mechanisms, resistances H, R, D.
4. Switching-in resistances of the same and different type, resistance network.
5. Starting and braking hydrostatic mechanisms, heat calculation of hydrostatic circuits.
6. Components of hydrostatic mechanism: converters and their parameters.
7. Hydraulic generators: construction, characteristic curves, circuits.
8. Rotary and rectilinear hydraulic motors: construction, characteristic curves, connection in circuit.
9. Elements for pressure, direction and rate of flow control.
10. Proportional elements, auxiliary elements.
11. The ground of hydrostatic mechanisms design.
12. Hydrostatic propulsive circuits of mobile working machines.
13. Hydrodynamic couplings and hydraulic torque converters.
Laboratory exercise
6 hours, compulsory
Teacher / Lecturer
Syllabus
6. Construction and maintenance of main elements of hydrostatic circuits.
7. Drawing up a hydraulic generator characteristic curve.
8. Control of hydraulic motors speed in open hydraulic circuits.
Exercise
7 hours, compulsory
Syllabus
1. Fluids of hydrostatic circuits and their properties.
2. Hydraulic loss in hydrostatic mechanisms.
3. Calculation of resistances across movement, acceleration, deformation.
4. Calculation of starting and braking hydrostatic mechanisms.
5. Heat calculation of hydrostatic mechanisms.