1993 Fiscal Year Final Research Report Summary
Studies on Precision Grinding of Internal Gears and Internal Speed Changers
| Project/Area Number |
04650136
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Saga University |
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Principal Investigator |
ISHIBASHI Akira Saga Univ.Mech.Engg.Professor, 理工学部, 教授 (80037720)
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| Co-Investigator(Kenkyū-buntansha) |
SONODA Keiji Saga Univ.Mech.Engg.Researcher, 理工学部, 助手 (50163142)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Machine element / Gear / Internal gear / Planetary gear / Gear grinder / Gear noise / Traction drive / Efficiency |
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| Research Abstract |
An internal gear grinder was produced by improving the mechanism of a CNC (computer numerically controlled) external gear grinder which was previously designed and made by the present investigators. The form grinding wheel for internal gears was trued automatically on the gear grinder using the servo-motors and a dresser with a single diamond grain. Internal gears with a module of 4, 60 teeth and a face-width of 50 mm were finished on the trial internal gear grinder. Moreover, the external gears to be used for the sun and planetary gears were finished by the trial gear grinder. Power transmission efficiency of the internal gear drive with these gears is higher than 98% because the speed reduction ratio is not high and contains no differential mechanism.
Two kinds of differential gear drives were designed and made to increase the reduction ratio, and running tests were conducted. Moreover some gears in the internal gear train of an automatic transmission of a passenger car were ground an
… More
d the effects of grinding on the running noise and power transmission efficiency were examined.
The trial internal gear drives was high in the efficiency, but running noise was not low as expected. As hopeful high performance internal gear drives, internal hybrid reducer were designed and made, in which one of the two internal gears was replaced by a ring roller and the sun and planetary rollers were used instead of the gears. These hybrid reducers produced appreciably lower running noise than the internal gear drives because the shock loading between teeth is modified by the oil film between the rollers.
However, it should be noted that the power transmission capacity of the hybrid reducers is lower than the internal gear drives when the sizes of the gear boxes are assumed to be constant. Therefore, further systematic investigation is required to reduce the running noise of internal gear drives in the field of the design and manufacturing method in gear systems together with gear grinding technology. Less
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