Straddle Vehicle Engine Mounting for Assembly Efficiency
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Solution Overview
Problem
Conventional straddle-type rough-road running vehicles face complex and labor-intensive assembly processes due to the intricate layout of intake and outlet ducts for the belt-cooling device, which compromises the vehicle body's assembling performance and production efficiency.
Innovation Solution
The vehicle design features an engine unit mounted centrally with an offset arrangement of the engine body, power transmission case, intake control unit, and air-cleaner case, along with a gas/liquid separation induction box, allowing for easier assembly and integration of main components, and a divided exhaust pipe for improved mounting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake port and outlet port are arranged at the central portion or outside portion of the vehicle body frame, then the belt-cooling device can be effectively provided, but the layout of intake duct and outlet duct becomes very complicated, deteriorating the assembling performance of the vehicle body
Solution Approach 1:
The patent applies dimensionality change by arranging the intake port and outlet port in the longitudinal direction of the vehicle body frame rather than in the width direction or at the central portion. This spatial reconfiguration in a different dimension (longitudinal vs. lateral positioning) allows the ducts to be connected in a simpler, more straightforward manner, improving assembling performance while maintaining the belt-cooling function.
2Reliability
If the intake duct and outlet duct are connected in a complicated manner to reach the intake port and outlet port, then the belt-cooling device can be provided, but the working labor increases and production efficiency decreases
Solution Approach 1:
By repositioning the intake port and outlet port along the longitudinal direction of the vehicle body frame, the patent creates a more favorable spatial arrangement for duct connection. This dimensional change in port positioning reduces the complexity of duct routing, thereby decreasing working labor and improving production efficiency while preserving the belt-cooling function.
3Ease of operation
If the engine unit and related components are arranged in a conventional layout, then the vehicle can operate, but the assembling performance of the vehicle body is poor and assembly process is labor-intensive
Solution Approach 1:
The patent applies dimensionality change to the overall arrangement of engine components by positioning the intake port and outlet port in the longitudinal direction. This spatial reconfiguration creates a more assembly-friendly layout that reduces working complexity and improves assembling performance, while the vehicle maintains its operational functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the assembling performance of the vehicle body, improves standing stability and steering, reduces power loss, and simplifies the manufacturing process by concentrating main components at the central portion, thus increasing production efficiency and reducing the complexity of wiring and connections.
Implementation Method 1
a liquid/gas separating member having a box-shape is provided to an air intake duct at the most upstream side thereof
Implementation Method 2
an induction box for separating a gas and a liquid from a fresh air is connected to a most upstream side end portion of the intake duct
Data Source
AI summary
A straddle-type rough-road running vehicle includes a vehicle body frame supporting front and rear wheels, an engine unit mounted to the vehicle body frame and including an engine body and a power transmission case, a straddle type driver's seat, an intake control unit for controlling an air/fuel ratio, and an air-cleaner case for supplying a clean air to the intake control unit. The intake control unit and the air-cleaner case are connected to each other, and the air-cleaner case is disposed above the power transmission case. An engine mounting portion is formed in a frame shape opened such that the engine unit is surrounded from a vertical direction and a longitudinal direction. The engine body, the power transmission case, the intake control unit, and the air-cleaner case are disposed in an arrangement offset from the engine mounting portion in a side view.