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3 Dyk J.

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Rattle vibrations in models of gears

100%

Dyk J.

tom Vol. 13, No. 3

69-77

In this paper based on a gearbox model a suitable simplified model of the gear was built and analysed. The main focus of interest in this study was to determine the basic parameters affecting the gear rattle generation. The problem of meshing gear wheels with spur teeth which can be in mesh on the second line of action with taking into account random deviations of base pitches were taken into consideration. The deterministic model of the gear for idle running was examined by a given form of viscous damping. The type of vibrations was specified for different parameters and their levels as well as the search for the symptoms of chaotic motion for low levels of damping were also within our scope of interest. For the suitable combination of external forces, backlash, varying meshing stiffness as well as low damping, it appears that the contact of the driving flank of the tooth of the pinion and the opposite flank to the driven one of the tooth of the driven gear takes place.

Recycling of cars in Poland - current problems

100%

Dyk J.

tom Vol. 13, No. 4

9-14

Poland is now in the course of creating the nation-wide recycling system for withdrawn from use vehicles. The paper presents problems concerned with these issues. In the field of the recycling in Poland there are now in operation several information systems. In order to fulfil the requirements of the UE Directive, there is a need of introduction of the new system having more general character and giving possibilities for evaluation the levels of recycling. Such a kind of the system is worked out in the Institute of Machine Design Fundamentals of Warsaw University of Technology. Using this system which is operated via the INTERNET, one can create and collect reports about the recycling. It may make the information flow in the national recycling system more efficient. The paper characterizes the system of disassembly stations and recycling plants, the changes in the building of cars and information systems for evaluation the levels of recycling. The disassembly stations for cars in Poland, financial flow in the recycling system, tendency for the changes of construction materials used in the car manufacture, information flow in the national recycling system are presented.

Gear teeth separation in a model of a spur gear

100%

Dyk J.

2014

tom nr 6

3402--3409

The forced model of an isolated single-stage gear considering backlash and possible instant engagements of teeth on the second line of action is examined. Base pitch errors, various levels of viscous damping and the description of the varying gear meshing stiffness are taken into consideration. Results of calculation for the suitable combination of external forces, backlash, varying meshing stiffness, base pitch errors as well as damping, show that the phenomenon of possible loss of contact between the meshing teeth can be generated at the resonat zones even by the constant external loads.

W pracy zbadano model izolowanej przekładni zębatej z uwzględnieniem luzu międzyzębnego oraz możliwości chwilowego styku zębów na drugiej teoretycznej linii przyporu. Uwzględniono również opis błędów podziałki zasadniczej, różne poziomy tłumienia drgań przekładni oraz zmienną w czasie sztywność międzyzębną. Dla odpowiednich kombinacji sił zewnętrznych, luzu, zmiennej sztywności, błędów podziałki zasadniczej jak też tłumienia, zerwanie styku zębów występuje w strefach rezonansowych nawet przy wymuszeniu stałym obciążeniem zewnętrznym.