PROBLEM TO BE SOLVED: To provide a bolt fastening part structure and a cross member fastening part structure, capable of obtaining stable fastening power by eliminating deviation of a contact surface pressure in bolt fastening.SOLUTION: A bolt fastening part structure is equipped with bolt mounting long holes 25A, 25B, 25C at an end part 23 of a transmission cross member 20, and nut parts 32A, 32B, 32C to a vehicle body member. Besides, perfect circle-like recesses 26A, 26B, 26C surrounding the bolt mounting holes 25A, 25B, 25C are provided on a contact surface of the end part 23 so that mounting bolts 31A, 31B, 31C penetrate the bolt mounting holes 25A, 25B, 25C and are screwed in the nut parts 32A, 32B, 32C to be fastened. The recesses 26A, 26B, 26C respectively have center points Oa, Ob, Oc displaced from bolt shanks a, b, c to a centroid C side on the straight line connecting the bolt shanks a, b, c of the mounting bolts 31A, 31B, 31C screwed in the nut parts, and the centroid C set by the bolt shanks a, b, c.SELECTED DRAWING: Figure 7

    【課題】ボルト締結時の接触面圧の偏りをなくし、安定した締結力が得られるボルト締結部構造およびクロスメンバ締結部構造を提供する。【解決手段】トランスミッションクロスメンバ20の端部23に長孔からなるボルト取付孔25A、25B、25Cを備え、車体部材にナット部32A、32B,32Cを備え、取付ボルト31A、31B、31Cがそれぞれ各ボルト取付孔25A、25B、25Cを貫通しかつ各ナット部32A、32B、32Cに螺合して締結するにあたり、前記端部23の接触面に各ボルト取付孔25A,25B,25Cの囲みかつ当該ナット部に螺合する取付ボルト31A、31B、31Cのボルト軸a、b、cと、ボルト軸a、b、cによって設定される重心Cとを結ぶ直線上でボルト軸a、b、cから重心C側に変位した中心点Oa、Ob、Ocを有する真円状の凹部26A、26B、26Cを設ける。【選択図】図7


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    Title :

    BOLT FASTENING PART STRUCTURE AND CROSS MEMBER FASTENING PART STRUCTURE


    Additional title:

    ボルト締結部構造およびクロスメンバ締結部構造


    Contributors:

    Publication date :

    2017-03-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / F16B DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES , Vorrichtungen zum Befestigen oder Sichern von Konstruktionselementen oder Maschinenteilen, z.B. Nägel, Bolzen, Schrauben, Sprengringe, Klemmen, Klammern oder Keile



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