SPROCKET

• Main Author: KATAYAMA KEISHI
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2023
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To make a roller of a double-pitch chain easy to grip.SOLUTION: With d1 being a roller diameter of a double-pitch chain, Z2 being the number of operation teeth that mesh with rollers per rotation of a sprocket, and P2 being a pitch of the double-pitch chain, (i) a radius R of a tooth bottom circular arc 12a is as R=(1.005d1+0.076)/2, (ii) a radius E of a tooth root circular arc 12b is E=1.3025d1+0.038, (iii) an angle of a direction line ab connecting a center a of the tooth bottom circular arc 12a and a center b of a tooth tip circular arc 16 with respect to a reference direction line RL passing through the center a of the tooth bottom circular arc 12a and orthogonal to a sprocket radius direction line BL passing through the center a is D=90°/Z2, (iv) a distance G from the center a of the tooth bottom circular arc 12a and the center b of the tooth tip circular arc 16 is G=α.d1, (v) a tooth tip outside diameter is da=pitch circle diameter +P2/2×(0.6-tan(90°/Z2), and (vi) α>1.4. Thus, a theoretical intersection point 19 between the pair of tooth tip circular arcs 16, 16 provided in a crest part 14 is set outside an outline circle 18 around an axis c defined by the tooth tip outside diameter OD.SELECTED DRAWING: Figure 1 【課題】ダブルピッチチェーンのローラを掴みやすくする。【解決手段】ダブルピッチチェーンのローラ径ｄ１、スプロケットの１回転当たりにローラと噛み合う作用歯数Ｚ２、ダブルピッチチェーンのピッチＰ２として、（i）歯底円弧１２ａの半径Ｒ＝(1.005ｄ１＋0.076)／２、（ii）歯元円弧１２ｂの半径Ｅ＝1.3025ｄ１＋0.038、（iii）歯底円弧１２ａの中心ａを通り且つその中心ａを通るスプロケット半径方向線ＢＬに直交する基準方向線ＲＬに対する、歯底円弧１２ａの中心ａと歯先円弧１６の中心ｂとを結ぶ方向線ａｂの角度Ｄ＝90°／Ｚ２、（iv）歯底円弧１２ａの中心ａから歯先円弧１６の中心ｂまでの距離Ｇ＝α・ｄ１、（v）歯先外径ｄａ＝ピッチ円直径＋Ｐ２／2×（0.6－tan（90°／Ｚ２）とし、（vi） α＞１．４とすることで、山部１４が備える対の歯先円弧１６，１６同士の理論交点１９を、歯先外径ＯＤで規定される軸心ｃ周りの外形円１８よりも外側に設定した。【選択図】図１