Course detail

Hydraulic Gears of Machines

FSI-FHP-KAcad. year: 2019/2020

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.

Learning outcomes of the course unit

Students will be acquire knowledge of designing and construction especially of mobile machines from the selected field. They will widen and deepen their knowledge of design of regulative hydrostatic circuit – with respect to the latest development trends.


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


Not applicable.

Recommended optional programme components

Not applicable.

Recommended or required reading

kolektiv: Grundlagen und Komponenten der Fluidtechnik Hydraulik, Band 1. Mannesmann Rexroth GmbH 1991, ISBN 3-8023-0619-8
ŠKOPÁN, M.: Hydraulické převody strojů. Elektronická verze, VUT Brno 2004
PEŇÁZ, V. - BENŽA, D..: Tekutinové mechanismy. Skriptum VUT Brno, 1990. ISBN 80-214-0082-X
kolektiv: Příručka hydrauliky, Svazek 2. Mannesmann Rexroth GmbH 1991, ISBN 3-8023-0898-0
SVOBODA, J.: Hydraulické převody pro vozidla. Skriptum ČVUT Praha, 1999
KOPÁČEK, J.: Mechanické a hydraulické převody. Hydraulické převody. Skriptum VŠB TU Ostrava 1996. ISBN 80-7078-413-X

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 examination consists of a written and an oral part. Written part of examination is evaluated by 50 points and it is necessary to get at least 20 points to continue in the oral part. Oral examination is marked independently and it is the same weight at the written part.

Language of instruction


Work placements

Not applicable.


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.

Classification of course in study plans

  • Programme B3S-K Bachelor's

    branch B-SSZ , 3. year of study, summer semester, 6 credits, compulsory

Type of course unit


Guided consultation

15 hours, optionally

Teacher / Lecturer


1. Theory of hydrostatic mechanisms, continuity equation, Bernoulli’s 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

2 hours, compulsory

Teacher / Lecturer


8. – 9. Construction and maintenance of main elements of hydrostatic circuits
10. – 11. Drawing up a hydraulic generator characteristic curve
12. – 13. Control of hydraulic motors speed in open hydraulic circuits

Controlled Self-study

35 hours, compulsory

Teacher / Lecturer


1. Fluids of hydrostatic circuits and their properties
2. – 3. Hydraulic loss in hydrostatic mechanisms
4. Calculation of resistances across movement, acceleration, deformation
5. – 6. Calculation of starting and braking hydrostatic mechanisms
7. Heat calculation of hydrostatic mechanisms