Power Take-Off Gear Biasing for Stable Mesh and Low Rattle
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Solution Overview
Problem
Gear trains experience vibrational disturbances due to meshing teeth, leading to objectionable acoustical issues and structural excitations, which existing technologies fail to adequately address.
Innovation Solution
A control system with a control module that displaces a gear support shaft to reduce looseness between intermeshed gears, using a biasing force to improve gear mesh engagement and attenuate vibrations, particularly through the use of a plunger pin and spring mechanism or fluid pressure to adjust the gear alignment and reduce gear rattle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If looseness is provided between gear teeth to accommodate tolerances, then manufacturing precision is improved, but gear mesh stability deteriorates causing vibrational disturbances
Solution Approach 1:
A control module acts as an intermediary between the housing and the gear support shaft, applying a biasing force to maintain optimal gear mesh engagement. This mediator compensates for the looseness between gear teeth while preventing excessive vibration, resolving the contradiction between manufacturing tolerance accommodation and gear mesh stability.
Solution Approach 2:
The control module dynamically adjusts the position of the gear support shaft by applying variable biasing forces, changing the engagement parameters between gear teeth. This allows the system to maintain stable gear mesh despite manufacturing tolerances, improving both manufacturing precision utilization and gear mesh stability.
2Stability of the object's composition
If gear teeth are tightly engaged to reduce vibration, then gear mesh stability is improved, but manufacturing tolerance accommodation deteriorates causing binding or excessive wear
Solution Approach 1:
The control module provides dynamic adjustment of gear support shaft position, allowing the gear mesh engagement to adapt to operating conditions. This dynamic system maintains tight engagement for vibration reduction while accommodating manufacturing tolerances to prevent binding, resolving the contradiction between gear mesh stability and tolerance accommodation.
Solution Approach 2:
The control module acts as an intermediary that applies controlled biasing forces to the gear support shaft, mediating between the need for tight gear engagement and the need to accommodate manufacturing tolerances. This prevents both excessive looseness and binding conditions.
3Stability of the object's composition
If a control module is added to reduce gear vibrations, then gear mesh stability is improved, but device complexity increases
Solution Approach 1:
The control module is designed to automatically adjust gear support shaft position based on operating conditions without requiring complex external control systems. The biasing mechanism self-regulates to maintain optimal gear mesh engagement, reducing device complexity while improving gear mesh stability.
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 control system effectively reduces or eliminates gear rattle vibrations by enhancing gear mesh engagement, improving power transfer efficiency and reducing noise and structural excitations across various load conditions.
Implementation Method 1
using a biasing force to improve gear mesh engagement and attenuate vibrations, particularly through the use of a plunger pin and spring mechanism
Implementation Method 2
using a biasing force to improve gear mesh engagement and attenuate vibrations, particularly through the use of a plunger pin and spring mechanism or fluid pressure
Data Source
AI summary
A power take off unit includes an input gear, an output gear, and an intermediary gear that cooperate to transfer power from a rotational power source to an operating target. The power take off unit has a control module that biases the intermediary gear relative to the input gear and the output gear to reduce gear rattle vibrations associated with intermeshed tooth looseness.