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Abstract: The
calculation method of positive and negative transmission mechanical
efficiency of one tooth difference 2K-H cycloid-needle planet
transmission with backlash is studied for the solution to the problem of
self-locking performance instability of adjustable-angle mechanism of
seat on automobile. A perfect mathematical model of instantaneous and
average efficiency of the converted mechanism of the original epicyclic
gear train is proposed based on mechanics analysis of the gear pair
actual meshing transmission process. The mechanical efficiency of 2K-H
epicyclic gear train is obtained through the efficiency of the converted
mechanism calculated by mathe-matical model presented. Computerized
program of the efficiency calculation is developed. The formula is
available with both theoretic calculation and test result of
adjustable-angle product. The relationship between mechanical efficiency
and kinematics parameter are studied by using the program calculation.
The research conclusion is drawn that increasing friction coefficient,
decreasing the offset and the difference between tooth numbers of two
needle gears, increasing the number of pairs of teeth in contact at same
time, changing the distribution of acting force and the initial relative
angle of the centers of two pieces of cycloid gear can improve the
self-locking performance, which is used to guide the improvement of
self-locking performance of adjustable-angle mechanism of seat on
automobile. The presented mathematical model pro-vides a basis for
further researches such as the efficiency with machining tolerance,
optimum design of the mechanism and transmission performance of tooth
profile modified.
Key words: Mathematical modeling
Needle cycloid planetary transmission
Mechanical efficiency
Self locking performance
Angle adustment Backlash
CLC No: TH132.4
Received 20051018, received in revised form 20060518
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