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Using of cycloidal gear in car selfstarter

Siczek K., Warda B.

Journal of KONES

2008

Vol. 15, No. 4

509-516

Nowadays the car selfstarters of new generation differ from those used so far, which are serial electromotors. The biggest manufacturers of these selfstarters are: Bosch, Valeo, Delco and Hitachi. Their main characteristic property is using of magnetic field from sintered magnets for excitation of selfstarter. The other characteristic property is using of planetary gear. During initial researches, the rub off teeth of ring gear has been often met in investigated selfstarters. This observation motivated the authors of the paper to investigate possibility of replacing of planetary gear by cycloidal gear in selfstarter. The influence of replacement of planetary gear by cycloidal gear upon operating conditions, such as loading and relative velocity in selfstarter bearing and for teeth of pinion - flying wheel gear, is considered in this paper. Also, the loading of elements of cycloidal gear has been calculated. It is difficult to find characteristics of such selfstarters in known literature - so it is necessary to obtain such characteristic by measurement or calculation approximated characteristic, for example, with FEM method. In the paper the approximated characteristic has been obtained for sample Bosch selfstarter. The knowledge of geometry of selfstarter, material properties and of approximated characteristic of selfstarter allows obtaining value of loading and relative velocities of mating parts with use of elaborated FEM model. For calculation the helping mathematical models have been used. The results of computation and the picture of wear of any selfstarter parts are presented in the paper.

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

Siczek K.

Silniki Spalinowe

2007

R. 46, nr SC1

212-226

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.