Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1994 Volume 148 Pages Cover1-
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_Cover1

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[title in Japanese]

Article type: Cover
1994 Volume 148 Pages Cover2-
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_Cover2

JOURNAL FREE ACCESS

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On Accuracy of Arc-Simulations for Involute-, Cycloid-Curve of Gear Tooth Profile

Muneo TOHKOKU

Article type: Article
1994 Volume 148 Pages 1-10
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_1

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Generally, circular arc profile gears are mainly used in wristwatches, because of their very small size and that minimun number of teeth of pinion is 6 sometimes, but we have not been able to standardize the excelent cutter of gears. Recently, involute curve is being used gradually for gear profile of wristwatch and small machine gearing. In this case, its production is formed by milling cutting (shaping) methcds, but not generated in our company, so we have had to simulate involute cueve with circular-arc. We had establised 2 arcs simulation for involute curve according to the past records. However, cycloid profile gear is useful for a few teeth gear. Therefore, if gearing is requsted to be miniaturized in the future, it seems that cycloid is more imporfant than involute. In this case, we must replace cycloid curve by a few circular arc. In this paper, we clarified 3-arcs simulation for cycloid curve with very small error. For example, simulation errors are ±0.3[μm] in case pitch circle radius (c.r.)= 0.6, rolling c.r.= 0.5, outside radius (r.) = 0.8[mm]; ±0.5[μm] in case pitch c.r. = 0.6, rolling c.r.= 0.5, outside r.= 0.9[mm]; and ±1[μm] in case pitch c.r.= 0.6, rolling c.r.= 0.3, outside r.= 0.9[mm].

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A Design of Circular-Arc-Tooth Gear

Hideo TSUCHIYA

Article type: Article
1994 Volume 148 Pages 11-20
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_11

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This paper presents a design method of circular-arc-tooth gear used in a product such as a clock. This design method obtains the tooth shape of a gear to be engaged with the gear (e.g.small gear) whose tooth shape is already known. Basic idea is that it treats a pair of gear as a pair of cam so that when the driving gear rotates by exact one pitch of tooth, the idle gear moves by exact one pitch of tooth. As parameters for design, (κ) and (η_e) are introduced in which (κ) determines the engagement start/end points of the known gear and (η_e) is the transmission ratio at the engagement end point. By properly selecting (κ) and (η_e), a circular-arc-tooth which satisfies various purposes can be designed. Further, by using the special point of a circular-arc-tooth gear, various shapes of tooth besides circular-arc-tooth can be designed unrestrictedly.

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[title in Japanese]

[in Japanese]

Article type: Article
1994 Volume 148 Pages 21-28
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_21

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

Article type: Article
1994 Volume 148 Pages 29-52
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_29

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[title in Japanese]

[in Japanese]

Article type: Article
1994 Volume 148 Pages 53-56
Published: March 20, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.148.0_53

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