Longitudinal Cylinder Engine Layout for Leisure Vehicles
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Solution Overview
Problem
Transverse-mounted in-line engines in leisure vehicles face issues with increased frontal-projected area, air resistance, exhaust efficiency, and vertical vibration, which affect performance and handling due to their vertical cylinder orientation, limiting the ability to change the engine position without altering the vehicle's center of gravity.
Innovation Solution
The engine is designed with cylinders oriented in a substantially longitudinal direction, reducing the vertical dimension and frontal-projected area, and positioning the crankshaft above the transmission chamber, allowing for a more compact and efficient layout that minimizes air resistance and exhaust pressure loss while maintaining a stable center of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cylinders are arranged vertically in a transverse-mounted in-line engine, then mechanical loss is reduced due to simple valve system construction, but frontal-projected area increases leading to increased air resistance
Solution Approach 1:
The patent reorients the cylinder arrangement from vertical to substantially horizontal, changing the spatial dimension of the engine components. This dimensional change reduces the frontal-projected area of the engine, thereby decreasing air resistance while maintaining the transverse-mounted in-line configuration that provides simple valve system construction and low mechanical loss
2Length of moving object
If exhaust pipe is curved with small curvature radiuses to extend from engine opening, then exhaust pipe length is reduced, but pressure loss and fluid resistance increase decreasing exhaust efficiency
Solution Approach 1:
The patent employs smooth curved transitions with optimized curvature radii in the exhaust pipe design. By carefully selecting larger curvature radii at critical bends, the exhaust pipe maintains reasonable length while minimizing pressure loss and fluid resistance, thereby improving exhaust efficiency
3Length of moving object
If radiator is positioned forward of engine with small space between them, then vehicle length is reduced, but cooling efficiency decreases due to heat radiation from exhaust pipe and reduced cooling air flow
Solution Approach 1:
The patent introduces thermal insulation materials as intermediaries between the exhaust pipe and radiator, and between the exhaust pipe and engine. These intermediary insulation layers block heat radiation from the exhaust pipe, preventing it from interfering with radiator cooling efficiency while maintaining compact vehicle length
4Device complexity
If cylinders are arranged vertically, then transverse-mounted in-line configuration is achieved with simple valve system, but vertical dimension of engine increases limiting vertical space
Solution Approach 1:
The patent rotates the cylinder arrangement from vertical to substantially horizontal orientation. This dimensional transformation maintains the transverse-mounted in-line engine configuration with its simple valve system while dramatically reducing the vertical dimension of the engine, thereby freeing up vertical space in the vehicle
5Object-affected harmful factors
If counterweight is mounted to counteract piston reciprocation, then vertical vibration is reduced, but weight of movable components increases causing slow acceleration and deceleration
Solution Approach 1:
The patent changes the cylinder orientation from vertical to substantially horizontal, which fundamentally alters the direction of piston reciprocation from vertical to horizontal. This dimensional change causes the vibration to occur in the horizontal direction along the vehicle's longitudinal axis, where the rider is less sensitive to vibration, thereby eliminating or reducing the need for counterweights and maintaining low movable component weight for high-speed response
Data Source
AI summary
An engine for a leisure vehicle including a crank chamber in which a crankshaft is disposed, a transmission chamber in which a transmission unit of the vehicle is disposed, the transmission unit having an input shaft that is coupled to the crankshaft and configured to be driven by the crankshaft, a cylinder extending from the crank chamber, and a cylinder head attached to the cylinder. The crank chamber is located above the transmission chamber, and the cylinder is disposed in such a manner that an axial direction thereof is oriented in a substantially longitudinal direction of a vehicle body of the leisure vehicle.