CVT Mounting Assembly With Motion Decoupler For Snowmobiles
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Solution Overview
Problem
Snowmobiles with continuously variable transmissions (CVTs) face issues due to engine movement relative to the frame, causing vibration transfer and misalignment of pulleys, which affects torque transfer and leads to premature belt wear.
Innovation Solution
A CVT mounting assembly that includes a bracket with a motion decoupler, such as a self-aligning ball bearing, to support the countershaft, allowing for axial deviation and inclination, thereby reducing vibration transfer and maintaining pulley alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber mounts are used to mount the engine to the engine compartment, then vibration transfer from the engine to the frame is reduced, but the engine moves relative to the frame causing misalignment of pulleys and belt wear
Solution Approach 1:
A motion decoupler is introduced as an intermediary component between the engine and the CVT assembly. This motion decoupler allows relative movement between the engine and CVT while maintaining proper pulley alignment, thus resolving the contradiction between vibration isolation and alignment stability
Solution Approach 2:
The mounting system is segmented into separate functional components: rubber mounts for vibration isolation and a motion decoupler for alignment maintenance. This segmentation allows each component to specialize in its primary function without compromising the other
2Reliability
If stiffer engine mounts are used to reduce engine movement, then pulley alignment is maintained, but more vibrations are transferred from the engine to the frame
Solution Approach 1:
The mounting system is divided into separate functional elements: compliant rubber mounts that allow engine movement for vibration isolation, and a motion decoupler that maintains pulley alignment. This segmentation enables both vibration reduction and alignment stability simultaneously
Solution Approach 2:
The motion decoupler acts as a mediator between the flexible rubber mounts and the CVT assembly, compensating for the movement allowed by the rubber mounts while maintaining proper alignment of the pulleys
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
The solution effectively reduces vibration transfer to the frame and maintains consistent pulley alignment, improving torque transfer efficiency and extending belt life.
Implementation Method 1
A CVT mounting assembly that includes a bracket with a motion decoupler, such as a self-aligning ball bearing, to support the countershaft
Implementation Method 2
effectively reduces vibration transfer to the frame
Implementation Method 3
allowing for axial deviation and inclination, thereby reducing vibration transfer and maintaining pulley alignment
Data Source
AI summary
A snowmobile has a frame with an engine compartment and a tunnel, a front suspension, at least one ski, an engine, a bracket having a first portion joined to the engine and a second portion having an aperture defined therein, an output shaft, a countershaft passing through the aperture, a motion decoupler disposed around the countershaft and being supported by the second portion of the bracket, the countershaft being rotationally supported in the motion decoupler, a driving pulley disposed on the output shaft, a driven pulley disposed on the countershaft, a drive belt looped around the driving and driven pulleys, and an endless drive track. The driving pulley, the driven pulley and the drive belt together form a continuously variable transmission.