FRAME STRUCTURE OF MOTORCYCLE

• Main Authors: HIRAYAMA SEIJI, HAMADA NOBUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 28.12.2016
• Subjects: CYCLE AXLE SUSPENSIONS; CYCLE FRAMES; CYCLE SIDE-CARS, FORECARS, OR THE LIKE; CYCLE STEERING DEVICES; CYCLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; PERFORMING OPERATIONS; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FORCYCLES; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a frame structure of a motorcycle, which can inhibit bypassing of load transmission from a link mechanism and improve torsional rigidity of a vehicle body.SOLUTION: A lower frame 3 of a motorcycle is extended downward from the lower part of a head pipe 4, is then curvedly extended rearward and is connected to a lower cross member 8. The lower frame 3 has a pair of right and left lower frame pieces 12L, 12R at the rear part. Pull rods 46, which form a link mechanism LM of a rear suspension 25, are connected to the lower cross member 8. Swing arm brackets 6L, 6R and the lower frame pieces 12L, 12R are joined at first joining regions R1, respectively, and the swing arm brackets 6L, 6R and the cross member 8 are joined at second joining regions R2, respectively. The first joining region R1 and the second joining region R2 are connected to each other by a connection piece 69.SELECTED DRAWING: Figure 6 【課題】リンク機構からの荷重伝達の迂回を抑えるとともに、車体のねじり剛性を向上させることができる自動二輪車のフレーム構造を提供する。【解決手段】自動二輪車のロワフレーム３は、ヘッドパイプ４の下部から下方に延びたのち、後方に湾曲して延びてロワクロス部材８に接続されている。ロワフレーム３は、後部に左右一対のロワフレーム片１２Ｌ，１２Ｒを有している。ロワクロス部材８に、リヤサスペンション２５のリンク機構ＬＭを構成するプルロッド４６が連結されている。スイングアームブラケット６Ｌ，６Ｒとロワフレーム片１２Ｌ，１２Ｒとが第１接合領域Ｒ１でそれぞれ接合され、スイングアームブラケット６Ｌ，６Ｒとロワクロス部材８が、第２接合領域Ｒ２でそれぞれ接合されている。第１接合領域Ｒ１と第２接合領域Ｒ２とが連結片６９により連結されている。【選択図】図６