Saddle-riding Vehicle Shift Motor Rearward Displacement
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Solution Overview
Problem
Conventional electric power transmission apparatuses in saddle-riding vehicles face challenges in achieving compactness while maintaining clearance between the front wheel and shift motor, particularly due to internal combustion engine and transmission layout constraints.
Innovation Solution
The electric power transmission apparatus is designed with the shift motor positioned rearwardly of the front wheel, overlapping with the transmission compartment, and the speed reducer gear mechanism displaced to one side, allowing for compact clustering of components without projecting forward, thus maintaining clearance and eliminating the need for a separate cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the shift motor and change mechanism are clustered in the forward direction of the power unit to render the electric power transmission apparatus compact, then the compactness is improved, but the clearance between the front wheel and the shift motor cannot be defined
Solution Approach 1:
The shift motor is repositioned from a purely forward-directional layout to a multi-dimensional arrangement where it is disposed rearwardly of the front wheel and laterally adjacent to the power unit. This spatial reconfiguration in multiple dimensions allows the electric power transmission apparatus to maintain compactness while ensuring adequate clearance between the shift motor and the front wheel, preventing harmful contact during braking operations.
2Volume of moving object
If the shift motor is positioned forward to achieve compactness, then the volume is reduced, but the shift motor becomes vulnerable to pebbles flying from the front wheel
Solution Approach 1:
The shift motor is pre-positioned in a location rearwardly of the front wheel and laterally adjacent to the power unit, which is upwind relative to the direction of pebble ejection during wheel rotation. This preliminary spatial arrangement prevents pebbles from reaching the shift motor, eliminating the need for additional protective structures while maintaining apparatus compactness.
3Stability of the object's composition
If the internal combustion engine and transmission layout is conventional, then the engine operation is stable, but it is difficult to provide cavity in front face of power unit for shift motor placement
Solution Approach 1:
The power unit layout is segmented into distinct functional zones: the internal combustion engine occupies the upper portion with its traditional stable configuration, while the transmission is positioned in the lower portion. This segmentation creates available lateral space adjacent to the power unit where the shift motor can be installed without disrupting the stable engine operation, thereby facilitating easier manufacturing and assembly.
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 configuration enables a more compact and efficient electric power transmission apparatus, protecting the shift motor from debris and maintaining desired bank angles during turns, while ensuring the apparatus remains compact along the vehicle's longitudinal direction.
Implementation Method 1
a speed reducer gear mechanism for reducing the speed of rotational power from the shift motor being disposed in a forward direction of the transmission compartment
Data Source
AI summary
A saddle-riding type vehicle wherein an electric power transmission apparatus is rendered compact and a clearance is kept between a front wheel and a shift motor in a structure wherein a change mechanism and the shift motor are disposed in a forward direction of a power unit. A change mechanism for selectively establishing a gear stage of a transmission and a shift motor for supplying rotational power to the change mechanism are disposed in a forward direction of a power unit. A speed reducer gear mechanism for reducing the speed of the rotational power from the shift motor is disposed in a forward direction of a transmission compartment. The shift motor is disposed such that a main motor body thereof is positioned rearwardly of the speed reducer gear mechanism.