TH42452B - motorcycle - Google Patents

Abstract

DC60 (July 29, 2009) Problem to be solved: To provide a motorcycle with an engine section that has higher fuel combustion efficiency and a larger volume gearbox, while the vehicle's dimensions are virtually zero. Solution: Engine unit 30, positioned beneath gearbox 20, rotates along a pivot point around the connecting rod 31, moving in conjunction with the rear wheel 55, considering the chassis 10. Air intake pipe 36, which defines the boundary of the main air intake P1, is connected to the body 21 of engine unit 30. An auxiliary air intake K1, branching from the main air intake P1 between the first and second throttle valves 40A, 40B, positioned in intake pipe 36, is provided. The auxiliary air intake K1 directs air into the vacant area adjacent to the injectors, at least during idle. The connecting rod 31 is positioned below the cylinder axis L1 of the cylinder block 22 and in front of the crankcase 24. Selected drawing: Figure 9. Problem to be solved. To provide a motorcycle with a more efficient internal combustion engine and a larger volume gearbox, while maintaining virtually no increase in overall size, the solution involves mounting engine unit 30 beneath gearbox 20, rotating around a pivot point 31 in conjunction with the rear wheel 55, considering the chassis 10. An air intake duct 36, defining the boundaries of the main air intake P1, is connected to the engine block 21 of engine unit 30. An auxiliary air intake K1, branching from the main air intake P1 between the first and second throttle valves 40A and 40B, positioned in intake duct 36, is provided. The auxiliary air intake K1 directs air to the vacant space adjacent to the injectors, at least during idle. The pivot point 31 is positioned below the cylinder axis L1 of the cylinder block 22 and in front of the crankcase 24. (Diagram chosen: Figure 9)

Claims (14)

1. A motorcycle consisting of the following components: the frame, the front and rear wheels supported by the frame, the seat supported by the frame, a storage box placed in the space beneath the seat, the footrests placed in front of the seat, and the engine unit placed beneath the storage box in the aforementioned space and supported by the frame so that it can rotate vertically along with the rear wheel. The engine unit consists of the following components: the cylinder block, which includes the crankcase supporting the crankshaft; the cylinder block, connected to the crankcase and supporting the piston, which moves back and forth along the axial length extending forward from the crankcase; and the cylinder head, which works in conjunction with the cylinder block to define the boundaries of the combustion chamber and includes air intake ports that define the boundaries of the main air intake passage connected to the combustion chamber. The air intake duct, extending forward and backward in the overall vehicle structure, connects to the cylinder head and works in conjunction with the cylinder head to define the boundaries of the main air intake passage. The connecting rod is positioned below the axial length of the cylinder block and in front of the crankcase. It serves as a pivot point on which the engine unit rotates, guiding the pivot around that section when considering the vehicle's chassis. The throttle body, containing the first and second throttle valves spaced apart in the direction of airflow into the air intake duct, and the tubular assembly that defines the boundaries of the air intake duct and supports the first and second throttle valves, are positioned above the engine in such a way that when the first direction is defined as parallel to the imaginary line passing through the center of the front and rear wheels when the vehicle is viewed from its side, the first imaginary line extending between the center of rotation of the first throttle valve and the center of rotation of the pivot stem has a greater slope when considering the first direction compared to the second imaginary line extending between the center of rotation of the first throttle valve and the center of rotation of the second throttle valve. The fuel injection device is attached to the cylinder head and has nozzles that inject fuel into the main air intake passage defined within the cylinder head, and the auxiliary air intake passage defining assembly that defines the boundaries of the air intake passage. An auxiliary air intake branches off from the main air intake between the first and second throttle valves to guide air into the empty space adjacent to the nozzle, at least during idle. 2. A motorcycle as described in Claim 1, where the air intake pipe is angled downward forward and one of the first throttle valves is positioned in front of the second throttle valve in a lower position than the second throttle valve. 3. A motorcycle as defined in Representation 2, where the second direction is defined as perpendicular to the first direction in the condition that the vehicle is viewed from the side, and the second imaginary line of the first dimension as measured in the first direction and the second dimension as measured in the second direction, where such first dimension is greater than such second dimension. 4. A motorcycle as specified in Reputation 1, where the first and second throttle valves overlap at least partially as visible in the first direction when the main air intake is closed by the first and second throttle valves. 5. A motorcycle as described in Reputation 2, whereby the engine has a top surface which has an adjacent higher and lower surfaces in one direction, and the second throttle valve and the first throttle valve are positioned in such a manner relative to the aforementioned higher and lower surfaces, respectively, in a condition where the vehicle is viewed from the side. 6. A motorcycle as described in Reputation 1, where the crankcase is located at the rear of the engine and the cylinder head is located at the front of the engine; the crankcase has its top end positioned higher than the top surface of the cylinder head; and the tubular assembly is positioned at least partially below the second imaginary line extending forward from the top end to meet the top surface of the cylinder head as seen from the side of the vehicle. 7. A motorcycle as specified in Claim 1, where the pivot rod is positioned below the lower surface of the engine. 8. The motorcycle as defined in Reputation 1, where the second direction is defined as perpendicular to the first direction in the condition where the vehicle is viewed from the side, and the pivot stem overlaps the front end of the body in the second direction. 9. The motorcycle as specified in Claim 1, where the chassis has a footrest support structure that holds the footrest in place, and a pivot rod is positioned beneath such footrest support structure. 10. The motorcycle as specified in Claim 1, whereby the positional relationship between the pivot rod and the engine unit, considering the first direction, is such that the pivot rod is positioned between the front end of the engine unit and the crankcase. 11. A motorcycle as described in Claim 1, where the piston rod is tilted upwards toward the front and the pivot rod is positioned below the underside of the engine and adjacent to the front end of the engine when the vehicle is viewed from the side. 12. A motorcycle as described in Claim 1, where the cylinder rod is tilted upwards toward the forward and the pivot rod is positioned below the underside of the body and in front of the tubular assembly. 13. The motorcycle as described in Representation 1, where the box has a lower surface which is adjacent to the top opposite the engine unit, and the box has an upward indentation which is positioned opposite its lower surface. 14. The motorcycle as described in Reputation 1, where the front end of the air intake pipe is bent downwards and connected to the upper surface of the cylinder head where the air intake port is open, and the fuel injection device is positioned differently from the air intake port in the cylinder head.