Saddle-ride Vehicle Engine Intake System Layout
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Solution Overview
Problem
Existing saddle-ride type vehicles face challenges in enhancing the output of internal combustion engines and compacting the engine mass, with a need for more efficient arrangement of intake and exhaust systems.
Innovation Solution
The design includes a single-cylinder engine main unit with a crankcase, cylinder body, and cylinder head, where the joining surface of the cylinder head to the head cover is inclined downward, allowing for a compact and concentrated intake system with a butterfly throttle valve and camshafts, and a curved cover to house driven sprockets, along with a drum housing box for the throttle drum, facilitating a greatly inclined downdraft type intake system and improved engine output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the intake system is arranged in a conventional configuration, then the engine structure is simpler, but the engine output is lower and the engine mass cannot be concentrated
Solution Approach 1:
The intake system is arranged in a greatly inclined downdraft type configuration, changing the traditional horizontal or vertical intake arrangement to a diagonally inclined configuration. This dimensional change allows the intake system to be compacted while improving engine output by optimizing the intake path and enhancing combustion efficiency.
Solution Approach 2:
The throttle device is integrated directly into the cylinder head structure, with the throttle drum housed in a drum housing box that is annexed to the throttle device and arranged close to the curve cover. This merging of components concentrates the engine mass and reduces the overall footprint while maintaining functionality.
2Device complexity
If the throttle valve is positioned farther from the engine main unit, then the intake system has more space for arrangement, but the engine mass cannot be concentrated and the intake system cannot be compacted
Solution Approach 1:
The throttle drum is housed within the drum housing box, which is nested into the space close to the curve cover and head cover. This nesting arrangement consolidates multiple components into a compact configuration, concentrating the engine mass and reducing the intake system length while ensuring proper spatial arrangement.
3Ease of manufacture
If the joining surface of the cylinder head to the head cover is formed on a plane perpendicular to the cylinder axis, then the manufacturing is simpler, but the rotation axes of camshafts and valve stems cannot be arranged on the same plane, leading to increased device complexity
Solution Approach 1:
The joining surface of the cylinder head to the head cover is formed on a plane that is inclined downward toward the front at a specific angle, rather than being perpendicular to the cylinder axis. This parameter change in the joining surface orientation enables the rotation axes of the camshafts and the valve stem axis to be arranged on the same plane, simplifying the overall device arrangement while maintaining manufacturing feasibility.
Data Source
AI summary
In a saddle-ride type vehicle in which a cylinder head of a single-cylinder engine main unit has a front wall and a rear wall, an exhaust system being connected to the front wall and an intake system being connected to the rear wall, a joining surface of the cylinder head to a head cover is formed on a plane crossing a cylinder axis, the plane being inclined downward toward a front. Rotation axes of camshafts are arranged on the plane. An axis of a valve stem of a throttle valve is arranged on the plane. A curve cover curved so as to cover driven sprockets fixed to the camshafts is formed on one side in a vehicle width direction of the head cover. A drum housing box housing a throttle drum fixed to one end of the valve stem is arranged close to the curve cover.