Power Take-Off Mounting Seal With O-Ring Tolerance Compensation
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Solution Overview
Problem
Current sealing methods for power take off systems, such as using paper and metal gaskets, are inefficient in maintaining a fluid-tight seal due to tolerance stack-up and require adjustments, which can be costly and time-consuming, and do not meet the improved tolerance and sealing demands of modern transmission systems.
Innovation Solution
An improved sealing structure featuring a groove in the housing of the power take off with an elastomeric O-ring or rectangular sealing member that provides a secure, frictional fit, ensuring a reliable seal between the power take off and the source of rotational energy, allowing for quick installation and adaptation to varying tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper and metal gaskets are used for sealing between power take off housing and source of rotational energy housing, then a fluid-tight seal can be provided, but the sealing structure requires frequent adjustments and is costly and time-consuming due to tolerance stack-up
Solution Approach 1:
The patent changes the sealing approach from rigid gaskets to a flexible elastomeric O-ring that can accommodate tolerance variations through elastic deformation. The O-ring's material properties allow it to seal effectively across a range of dimensional variations, eliminating the need for precise tolerance control and frequent adjustments.
Solution Approach 2:
The patent employs an elastomeric O-ring as a flexible sealing element that can deform to conform to the mating surfaces. This flexibility allows the seal to maintain fluid-tightness despite tolerance stack-up between components, removing the need for precise manufacturing tolerances and reducing adjustment requirements.
2Ease of manufacture
If paper gaskets are used to set desirable backlash between mating gears, then economical means are provided, but the power take off must be removed and re-mounted to adjust backlash, which is time-consuming
Solution Approach 1:
The elastomeric O-ring provides a compliant sealing solution that accommodates dimensional variations without requiring precise thickness control. This allows for economical manufacturing while maintaining assembly efficiency, as the flexible seal adapts to the actual dimensions rather than requiring precise pre-setting.
Solution Approach 2:
The O-ring serves as a simple, economical sealing element that can be easily replaced if needed. Its low cost and simplicity allow for quick installation and removal, improving assembly efficiency compared to rigid gaskets that require precise adjustment and potential surface grinding.
3Reliability
If metal gaskets with molded rubber edges are used for sealing, then a seal can be provided, but additional tolerances must be managed and surface grinding is required, increasing complexity and cost
Solution Approach 1:
The elastomeric O-ring provides a purely flexible sealing solution that eliminates the need for rigid metal components with molded edges. This single-material approach simplifies tolerance management, as the flexible rubber can accommodate dimensional variations without requiring additional machining or complex multi-material assemblies.
Solution Approach 2:
The patent uses a single elastomeric material for the O-ring seal, avoiding the composite construction of metal gaskets with molded rubber edges. This homogeneous material approach simplifies manufacturing and tolerance management while providing effective sealing, eliminating the need for surface grinding and complex assembly procedures.
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 proposed sealing structure ensures a reliable fluid-tight seal with easy installation, reducing the need for frequent adjustments and accommodating improved tolerances, thus enhancing the operational efficiency and compatibility of power take off systems with modern transmission systems.
Implementation Method 1
an elastomeric O-ring or rectangular sealing member that provides a secure, frictional fit
Implementation Method 2
an elastomeric O-ring or rectangular sealing member
Data Source
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AI summary
A power take off adapted to be supported on a source of rotational energy to provide rotational energy to a rotatably driven accessory includes a housing having a mounting surface adapted to be supported on a source of rotational energy. The mounting surface includes an opening and has a groove therein. A sealing member is disposed within the groove and is adapted to engage the source of rotational energy when the housing is supported thereon. An input mechanism is supported within the housing and includes a portion that extends outwardly through the opening from the housing and is adapted to be rotatably driven by the source of rotational energy. An output mechanism is rotatably driven by the input mechanism and is adapted to be connected to a rotatably driven accessory.