Course detail

Hydraulic and Mechnaical Gears

FSI-FHMAcad. year: 2023/2024

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


Number of ECTS credits


Mode of study

Not applicable.

Entry knowledge

Successful completion of the course is conditional on the basic knowledge of technical mechanics, physics, machine parts and their mechanisms.

Rules for evaluation and completion of the course

The exam is written. It consists of an example and theoretical questions. Preparation time is 100 minutes.
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 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.
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.

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

MÁLIK, Ladislav. Konštruovanie. III, Mechanické, hydraulické a hydromechanické prenosy. 2. preprac. vyd. V Žiline: Žilinská univerzita, 2012, 514 s. ISBN 978-80-554-0476-9.
BAROŠKA, Ján. Hydrostatické mechanizmy. Žilina: Hydropneutech, 2012, 388 s. ISBN 978-80-970-89726.
Majmudar, R.S.: Oil Hydraulics Systems, McGraw-Hill 2003, ISBN 0-07-140669-7

Recommended reading

ŠKOPÁN, M.: Hydraulické převody strojů. Elektronická verze, VUT Brno 2009
PAVLOK, Bohuslav. Hydraulické prvky a systémy. Díl 1., Kapaliny v hydraulických mechanismech, hydrostatické převodníky. 3. vyd. Ostrava: VŠB - Technická univerzita Ostrava, 2013. ISBN 978-80-248-2983-8. (CS)
PAVLOK, Bohuslav. Hydraulické prvky a systémy. Díl 2., Řídicí prvky hydrostatických systémů, příslušenství hydraulických obvodů. 2. vydání. Ostrava: VŠB - Technická univerzita Ostrava, 2015. ISBN 978-80-248-3777-2.
SUBRAMANYA, K. 1000 solved problems in fluid mechanics (includes hydraulic machines). New Delhi: Tata McGraw-Hill, 2005, ix, 456 s. : il. ISBN 978-0-07-014476-7.


Classification of course in study plans

  • Programme B-STR-P Bachelor's

    specialization SSZ , 3. year of study, winter semester, compulsory

Type of course unit



39 hours, optionally

Teacher / Lecturer


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


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. 


7 hours, compulsory

Teacher / Lecturer


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.