SUPPORTING STRUCTURE OF PISTON AND CONNECTION ROD

• Main Author: SUZUKI YU
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2020
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BEARINGS; BLASTING; COMBUSTION ENGINES; CYLINDERS; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; PISTONS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SEALINGS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

To provide an improved supporting structure of a piston and a connection rod capable of smoothly fitting a connection rod to a crank pin while preventing the connection rod from riding on a crank arm in descent assembling, by further improving a trapezoid fitting structure of the piston and the connection rod.SOLUTION: In a supporting structure of a piston and a connection rod in which a small end portion 3 of a connection rod B is disposed between a pair of piston pin bosses 1, 2 of a piston A, and a piston pin 4 is fitted, a clearance w in a direction of a pin shaft center p between the piston pin bosses 1, 2 is determined to be gradually narrowed toward a piston head side, a width in the direction of the pin shaft center p of the small end portion 3 is determined to be gradually widened toward a connection rod large end portion side, and inner end faces 1T, 2T on a small end portion side of the piston pin bosses 1, 2 are provided with projecting portions 8, 9 capable of keeping clearances in the direction of the pin shaft center p between outer end faces 3A, 3B on a piston pin boss side of the small end portion 3 and the inner end faces 1T, 2T at a prescribed value x.SELECTED DRAWING: Figure 1 【課題】ピストンとコンロッドとが台形嵌合構造を採る場合でのさらなる工夫により、下降組付け時におけるコンロッドのクランクアームへの乗り上げおそれがなく、円滑にクランクピンに嵌合されるように、改善されたピストンとコンロッドの支承構造を提供する。【解決手段】ピストンＡの一対のピストンピンボス１，２間にコンロッドＢの小端部３が配置され、ピストンピン４が嵌合されピストンとコンロッドの支承構造において、ピストンピンボス１，２どうしのピン軸心ｐの方向での間隔ｗがピストンヘッド側ほど狭くなるように設定され、かつ、小端部３のピン軸心ｐの方向での幅がコンロッド大端部側ほど広くなるように設定され、ピストンピンボス１，２の小端部側となる内端面１Ｔ，２Ｔに、小端部３のピストンピンボス側となる外端面３Ａ，３Ｂと内端面１Ｔ，２Ｔとのピン軸心ｐの方向での間隔を所定値ｘに維持可能な突出部８，９が設けられている。【選択図】図１