Snowmobile Gearbox With Electronic Reverse and High-Low Gearing
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Solution Overview
Problem
Snowmobiles lack a reliable method for controlling speed and torque, especially in reverse operations, as many do not have a reverse function, limiting user control and versatility.
Innovation Solution
A snowmobile design featuring a two-stroke internal combustion engine with an electronic reverse function, a continuously variable transmission (CVT), and a gearbox with selective gear engagement, allowing the engine to operate in forward and reverse directions while providing high and low gear options, along with a neutral gear for user-controlled speed and torque management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a CVT is used for speed and torque control, then transmission ratio variability is improved, but control precision in specific gear ranges deteriorates
Solution Approach 1:
The transmission system is segmented into two distinct components: a CVT for continuous variable ratio control and a gearbox with discrete gear pairings (high, low, neutral). This segmentation allows each component to excel at its specific function - the CVT provides overall adaptability while the gearbox provides precise control in specific operating ranges.
Solution Approach 2:
The system dynamically switches between continuous CVT operation and discrete gearbox engagement based on operational requirements. The shifter mechanism enables dynamic transition between gear states, allowing the system to adapt its control precision level according to the specific driving conditions.
2Adaptability or versatility
If an engine with electronic reverse function is used, then reverse operation capability is improved, but device complexity deteriorates
Solution Approach 1:
The gearbox is designed with universal functionality to handle both forward and reverse operations through its gear pairings. The same gearbox structure that provides high and low gear options in forward motion also enables reverse operation when engaged with the engine's electronic reverse function, eliminating the need for separate reverse-specific components.
3Measurement precision
If a gearbox with multiple gear pairings is added, then control precision is improved, but device complexity deteriorates
Solution Approach 1:
The gearbox provides localized precision control exactly where needed - in specific gear ranges (high and low gears). Rather than attempting continuous precision control throughout the entire transmission range, the system applies discrete gear pairings at specific operational points, optimizing control precision for critical speed and torque ranges while maintaining overall system simplicity.
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
Enhances user control over speed and torque in both forward and reverse operations, improving the snowmobile's performance and versatility by enabling selective gear engagement and reverse functionality.
Implementation Method 1
a transmission belt interconnecting the drive pulley and the driven pulley
Implementation Method 2
a plurality of first transmission gears mounted to the first shaft; a plurality of second transmission gears mounted to the second shaft; Each of the first transmission gears is in constant mesh with a corresponding one of the second transmission gears
Implementation Method 3
a two-stroke internal combustion engine supported by the frame
Data Source
AI summary
A snowmobile has a two-stroke engine having an electronic reverse function so that a crankshaft can be selectively rotated in forward and reverse rotation directions. A gearbox has a first shaft coupled to a countershaft, a second shaft extending parallel to the first shaft, first transmission gears mounted to the first shaft and second transmission gears mounted to the second shaft. The first transmission gears are in constant mesh with the second transmission gears to form high and low gear pairings. A shifter is operable for selectively operating the gearbox in one of a high gear, a low gear and a neutral gear. The engine is selectively operable in the forward and reverse rotation directions while the gearbox is operated in at least one of the high gear, the low gear and the neutral gear.