Straddle Vehicle Throttle Cable Horizontal Arrangement
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Solution Overview
Problem
The conventional straddle type vehicle with a swingable unit engine faces challenges in minimizing the space occupied by throttle cables, which interferes with the engine's swinging motion and increases the volume of the container box.
Innovation Solution
The throttle cables are arranged horizontally side by side above the intake passage and below the container box, with one cable connected to the upper surface and the other to the lower surface of the throttle drum, allowing them to be spaced apart and positioned without crossing, thus reducing the vertical space they occupy and allowing the container box to be closer to the intake passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two throttle cables (pull side and return side) are provided to control the throttle valve, then the throttle control reliability is improved, but the number of cables increases and the wiring complexity increases
Solution Approach 1:
The patent combines both the pull-side throttle cable and return-side throttle cable into a single integrated cable assembly. The cable housing contains both cables, and the throttle drum integrates both cable attachments, merging what would traditionally be separate wiring paths into a unified structure that controls the throttle valve bidirectionally.
Solution Approach 2:
The single cable assembly serves multiple functions: it provides both the pull-side tension to open the throttle valve and the return-side tension to close it. The throttle drum acts as a universal component that converts linear cable motion in both directions into rotational motion of the throttle valve, eliminating the need for separate wiring arrangements.
2Reliability
If throttle cables are arranged to prevent interference with the swinging engine, then the engine operation reliability is improved, but the space required for cable arrangement increases
Solution Approach 1:
The patent transitions from a traditional lateral or vertical cable arrangement to a horizontal arrangement above the intake passage. By positioning the cables in the horizontal dimension (fore-aft direction) rather than vertical or lateral dimensions, the design exploits unused spatial volume above the intake passage, keeping cables clear of the engine's swinging path while minimizing overall space requirements.
Solution Approach 2:
The cable routing is specifically optimized for the local region above the intake passage. The cables are positioned to pass through or above this specific area where space is available, rather than using generic routing paths. This localized arrangement ensures clearance from the engine while utilizing the specific geometric characteristics of the intake passage region.
3Volume of stationary object
If throttle cables are arranged horizontally side by side above the intake passage, then the vertical space is reduced allowing larger container box volume, but the cable arrangement complexity increases
Solution Approach 1:
Both throttle cables are nested within a single cable housing or sheath that runs horizontally above the intake passage. This nesting approach consolidates two separate cables into one organized assembly, reducing vertical space requirements while maintaining the horizontal side-by-side arrangement that maximizes container box volume.
Data Source
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AI summary
To provide a wiring structure of a throttle cable in a straddle type vehicle in which it is hard to exert the influence upon the volume of a container box. A wiring structure of a throttle cable 58 comprises a vehicle body frame 11, a unit swing engine 50 being supported on the vehicle body frame 11 in a swingable fashion, a container box 71 being arranged above the engine 50, an intake passage 55 extending from a cylinder section 50a of the engine 50 rearwardly along an engine main body 50B in such a way as to pass through between the container box 71 and the engine main body 50B, a throttle valve 56 being provided in the intake passage 55 so as to open and close the intake passage 55, a throttle cable 58a on the opening side and a throttle cable 58b on the closing side being fitted to a throttle drum 57 for operating the throttle valve 56. The throttle cable 58a on the opening side and the throttle cable 58b on the closing side are arranged side by side in the forward and backward direction of the vehicle substantially horizontally above the intake passage 55.