TH45922B - Motorcycle engine with main frame - Google Patents

Abstract

DC60 (02/11/55) In a main frame motorcycle, the space between the cylinder head and the main frame is enlarged to minimize intake system flex as much as possible, with the purpose of reducing intake air resistance. In a motorcycle where the main assembly of engine 20 of engine E, which is suspended from the main frame 2 extending downward towards the rear from the head tube 1, is assembled with crankcase 21 to support crankshaft 28, cylinder 22 is arranged in such a way that the axis Ab of the cylinder bore 22a is tilted upwards towards the front with a small slope, alpha, and cylinder head 23 connected to the front end of cylinder 22, and where in the space 66 between cylinder head 23 and main frame 2, the intake system 70 is arranged. Cylinder 22 is arranged in such a way that the axis Ab of the cylinder bore 22a is offset a distance S downward relative to the axis Ac of the crankshaft 28 in a main frame motorcycle. The space between the cylinder head and the main frame is enlarged to minimize intake air bending as much as possible, with the aim of reducing intake air resistance. In the motorcycle, where the main assembly of engine 20 of engine E, which is suspended from main frame 2 extending downward towards the rear from header pipe 1, is assembled with crankcase 21 to support crankshaft 28, cylinder block 22, which is arranged so that the axis Ab of cylinder bore 22a is tilted upward toward the front with a small gradient Alpha, and cylinder head 23 connected to the front end of cylinder block 22, and where in the space 66 between cylinder head 23 and main frame 2, the intake air system 70 is arranged. Cylinder block 22 is arranged so that the axis Ab of cylinder bore 22a is offset a distance S downward relative to the axis Ac of crankshaft 28.

Claims (4)

1. Engine in a framed motorcycle. In a framed motorcycle, where the engine body (20) of the engine (E) is suspended from the main frame (2) which extends diagonally downwards. At the rear end of the head tube (1) of the vehicle chassis (F) is assembled the crankcase (21), which supports the crankshaft (28), the cylinder block (22), which extends forward from the crankcase (21) and is positioned with the axis (Ab) of the cylinder bore (22a) tilted upward toward the front, and the cylinder head (23), which is connected to the front end of the cylinder block (22) to support the camshaft (38) of the valve system, and the intake system (70) of the engine (E) is positioned in the space (66) between the cylinder head (23) and the main chassis (2), where the cylinder block (22) is positioned with the axis (Ab) of the cylinder bore (22a) offset (S) toward the axis (Ac) of the crankshaft (28), and further on the cylinder head (23) is positioned with the axis (Am) of the camshaft (38) for the valve system. which is offset (S,) downward relative to the axis (Ab) of the cylinder bore (22a). 2. The engine in the main frame motorcycle according to claim 1 is characterized in that the cylinder head (23) is arranged in such a way that the axis (Am) of the camshaft (38) for the valve supported by the cylinder head (23) is offset (S') downward relative to the axis (Ab) of the cylinder bore (22a). 3. The engine in the main frame motorcycle under claim 1 or 2 is characterized in that the starting motor (80) is mounted on the lower upper part of the crankcase (21) in front of the crankshaft (28), and in the area directly behind the starting motor (80) and significantly above the crankcase (28), the suspension bushing (24) which is to be suspended from the main frame (2) is formed on the upper surface of the crankcase (21). 4. The engine in the main frame motorcycle under claim 3 is characterized in that the input shaft (86) and output shaft (87) of the transmission unit (85) mounted in the said crankcase (21) are arranged parallel to the said crankshaft (28), respectively, and the said input shaft (86) is positioned higher than the said crankshaft (28) and the said output shaft (87).