Movable Seal Assembly for Top Drive Oil Flow Path
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Solution Overview
Problem
Existing top drive systems face challenges with metal-to-metal seals wearing quickly at high gear speeds, leading to ineffective prevention of lubricating oil flow from the gear system to the motor shaft, especially when the system is non-vertically positioned.
Innovation Solution
A movable seal assembly with a rod piston and sealing arm, featuring one or more O-ring seals, is used to selectively prevent lubricating oil flow from the gear system to the motor shaft, with the seals being movable by a spring to close off the flow path and easily replaceable when worn or broken.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal-to-metal seals are used to prevent gear lubricating oil flow, then the seal structure is simple and durable, but the seals wear quickly at high gear speeds and fail to prevent oil leakage
Solution Approach 1:
The patent introduces non-metallic seal elements (such as polymeric or elastomeric materials) as intermediaries between the metal sealing surfaces. These intermediary materials provide better wear characteristics and sealing effectiveness at high speeds compared to direct metal-to-metal contact, resolving the contradiction between seal effectiveness and service life.
Solution Approach 2:
The patent employs composite seal structures combining metal and non-metallic materials. The metal components provide structural strength and durability, while the non-metallic components provide low-friction sealing surfaces that resist wear at high speeds, thereby extending seal service life while maintaining reliability.
2Ease of manufacture
If metal-to-metal seals require flat surface contact to effect a good seal, then the sealing mechanism is simple, but the seals wear quickly and become ineffective at high gear speeds
Solution Approach 1:
The patent utilizes flexible non-metallic seal rings or lips that can deform to conform to the sealing surface. This flexibility allows the seals to maintain effective contact without requiring perfectly flat surfaces, improving reliability at high speeds while remaining relatively simple to install.
3Device complexity
If a fixed seal assembly is used to prevent oil flow, then the structure is simple, but the seal cannot adapt to non-vertical positioning or tilting of the top drive system
Solution Approach 1:
The patent employs a movable or adjustable seal assembly that can dynamically adapt its position or orientation in response to changes in system positioning. This may include spring-loaded seals, hydraulically actuated seals, or mechanically articulated seal components that maintain sealing effectiveness whether the top drive is vertical or tilted, thereby improving adaptability without excessive complexity.
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 movable seal assembly effectively inhibits lubricating oil flow into a cavity below the motor, maintaining a reliable seal even at high gear speeds and during non-vertical orientations, with the ability to replace worn seals ensuring continuous operation.
Implementation Method 1
the seal is movable by a spring to close off a gear lubricating oil flow path
Implementation Method 2
the movable seal assembly has a sealing arm extending therefrom to which is secured an O-ring seal (or two or more O-ring seals)... When the O-ring(s) of the member movable seal abuts the gear seal member, the flow of lubricating oil from the gear system to the cavity below the motor is inhibited or prevented
Data Source
AI summary
A top drive system including, in certain aspects, a motor, a gear system below, and driven by the motor, a space between the top drive motor and the gear system, a seal assembly for inhibiting oil for lubricating parts of the gear system from flowing into the space, the seal assembly having a movable rod piston, a sealing arm projecting from the rod piston, at least one removable seal secured to the sealing arm, a seal member releasably secured to the gear system, and the movable rod piston movable to move the sealing arm to bring the at least one removable seal into sealingly contact with the seal member to inhibit oil from flowing into the space.