JOURNAL OF JAPAN SOCIETY FOR DESIGN ENGINEERING
Online ISSN : 2188-9023
Print ISSN : 0919-2948
ISSN-L : 0919-2948
Volume 57, Issue 12
Displaying 1-2 of 2 articles from this issue
Paper
  • (2nd Report, Derivation of the Diameter of the Circle Circumscribing the Rattling Area)
    Shinya SUZUKI, Tohru KANADA
    2022 Volume 57 Issue 12 Pages 607-620
    Published: 2022
    Released on J-STAGE: December 05, 2022
    Advance online publication: September 06, 2022
    JOURNAL FREE ACCESS

    This paper discusses the assembly variation that can arise when the positioning between two parts is constrained using two holes that fit over two bosses. Two parts positioned using two holes fitting over two bosses may move relative to each other during assembly because of slight clearances between the boss-hole pairs. In many cases, two boss-hole clearances are toleranced equally, resulting a motion which is more complex than simple translation or rotation. In thispaper, the region where a certain point can move due to rattling is called “rattling area”, and the formula for the diameterof the circle circumscribing the rattling area is derived. Furthermore, a drawing experiment was conducted to verify the calculation of the circumscribed circle.

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  • Reo MIWA, Norifumi MIYANAGA, Atsushi TSUJIMORI, Jun TOMIOKA
    2022 Volume 57 Issue 12 Pages 621-636
    Published: 2022
    Released on J-STAGE: December 05, 2022
    Advance online publication: October 07, 2022
    JOURNAL FREE ACCESS

    The lubrication characteristics of seal-type thrust bearings with dimples on the lubricating surface were experimentally investigated. Circular and two types of fan-shape dimples were etched on the stationary specimen of the bearings. A plane (dimple-free) bearing were also tested for comparisons. In the experiments, the test results obtained by measurements with a fixed fluid film thickness were compared to those by the general measurements with fixed applied load, and their validities were clarified. The fluid film force, frictional torque, and fluid film thickness were measured in both types of test devices. In addition, the lubricating surface were visualized during experiments. As the results, the oil film force of the circular dimple was about three times larger than that of the fan-shaped dimples, and the frictional torque of the circular dimple was also slightly smaller. The measurement results obtained by both types of test devices were in good agreement, including with cavitation phenomena, and the validity of the measurement method with a fixed fluid film thickness was confirmed.

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