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1

The operational conditions and wear of elements in selfstarter of new generation for combustion engine

Siczek K.

Silniki Spalinowe

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2007

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R. 46, nr SC1

212-226

EN

The selfstarters of new generation are applicable in combustion engines more commonly. They differ from classical selfstarters which are simply the range electrical engines. The greatest producers of the selfstarters are Bosch, Valeo, Delco and Hitachi. The first characteristic feature of the selfstarters is using of magnetic field from sintered magnets forto selfstarter excitation. The second characteristic feature is using planetary gear, built in the selfstarter. It is difficult to find the technical characteristics of selfstarters in available literature. Because of it, it is necessary to measure such characteristics experimentally or to calculate it by, for example, Finite Element Method. The examplary characteristic of selfstarter, manufactured by Bosch, has been calculated and presented in the article. The wear of selfstarter bearing appears during a work of selfstarter. The wear depends on operational conditions of moving elements of selfstarter. The wear especially depends on loading, relative velocity and temperature. Knowing geometrical parameters and material parameters, for example from literature, and having calculated characteristic of selfstarter it is possible to value the loading, relative velocity and temperature of co-working elements in the selfstarter. It can be done, with earlier processed model. The model have been done with using of Finite Element Method. The subsidiary mathematical models have been used for calculation, as well. The results of computation have been placed in the article. The pictures of wear of chosen elements of selfstarter has been presented in the article either. The most loaded bearing of selfstarter is the front one. The value of bearing reaction can be equal 500 N and more. The area stress in the bearing can be equal 50 MPa, when the axis of shaft and the axis of bearing bush are parallel. The area stress in bearing can be equal near 120 MPa, when the axis of shaft and the axis of bearing bush are non parallel. The area stress in bearing of rotor can be equal 10 MPa. The relative velocity in front bearing can be equal 1.8 m/s. The relative velocity in rotor bearing can be 10 m/s. The temperature of selfstarter bearings can equal the temperature of environment. The temperature of rotor coils can be equal 325 K and more. Because of wear of bearing it is possible that the rotor can impact sintered magnets of selfstarter.

2

Osobennosti formirovanija koehrcitivnojj sily v processe termicheskojj obrabotki spechennykh magnitov tipa Nd-Fe-B

Lukin A.A., Szymura S.

Archiwum Nauki o Materiałach

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2000

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T. 21, nr 1

21-30

PL

Badano zmiany siły koercji w wyniku obróbki cieplnej w zakresie temperatur 325-1175 K spiekanych magnesów (Nd, RE)-(Fe, M1, M2)-B (RE-Dy, Tb; M1-Al, Ga, Cu; M2-Ti, Nb). Przedyskutowano obserwowane zmiany siły koercji, uwzględniając rozdział boru między fazy stopu, niskotemperaturową eutektykę i dyspersyjne fazy typu: M1-Nd, M1-Fe-Nd, M2-B i M2-Fe-B.

EN

Coercive force changes due to heat treatment processes in the temperature range 325-1175 K of sintered (Nd, RE)-(Fe, M1, M2)-B (RE-Dy, Tb; M1-Al, Ga, Cu; M2-Ti, Nb) have been studied.

3

Budowa warstwy wierzchniej spiekanych magnesów Nd-Fe-B i jej wpływ na właściwości materiału.

Kaszuwara W., Leonowicz M., Wojciechowski S., Pawłowska G.

Inżynieria Materiałowa

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1998

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R. XIX, nr 4

942-945

PL

Warstwa wierzchnia spiekanych magnesów Nd-Fe-B składa się z dwóch stref: strefy zawierającej małe ziarna fazy Nd2Fe14B z wtrąceniami tlenków wewnątrz ziaren i strefy zawierającej duże wtrącenia Nd2O3. Stwierdzono, że jest ona wzbogacona w tlen i neodym, a zubożona w żelazo. Warstwa wierzchnia ma duży wpływ na odporność korozyjną magnesów. Badania dowiodły, że usunięcie warstwy wierzchniej zmniejsza o rząd wielkości szybkość utleniania materiału. Badane procesy korozyjne nie miały zauważalnego wpływu na właściwości magnetyczne magnesu zarówno dla próbek szlifowanych jak i badanych bezpośrednio po procesie technologicznym.

EN

Surface layer in sintered Nd-Fe-B magnets consist of two zones; first zone is formed of small grains of Nd2O3. The latter zone is rich in oxygen and neodymium and poor in iron. The surface layer has strong influence on corrosion resistance of magnets. It has been found that corrosion rate is reduced at order of magnitude when the surface layer is removed by grinding. The magnetic properties do not differ when measured for as-sintered and grinded magnets.