Recessed Rotational Coupling Installation Tool for Anti-Rotation Torqueing
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Solution Overview
Problem
Conventional methods for installing rotational coupling devices on shafts often result in the shaft rotating during fastener tightening, leading to misalignment and the inability to achieve desired torque due to the recessed position of the hub, which makes it difficult for tools to grasp and prevent rotation.
Innovation Solution
A specialized installation tool with a body and arm configuration that complements the hub's shape, allowing engagement with the hub's flange to prevent rotation of the tool and shaft during fastener tightening, ensuring proper alignment and torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional wrenches or tools are used to grasp the hub, then the hub can be held against rotation, but the recessed position of the hub prevents tools from reaching it without interfering with other tools used to rotate the fastener
Solution Approach 1:
The installation tool extends into the axial dimension to reach the recessed hub, with the arm extending axially beyond the pulley face to engage the hub flange from the front, eliminating radial tool interference
Solution Approach 2:
The installation tool acts as an intermediary device that bridges the gap between the operator and the recessed hub, providing a mechanical interface that allows torque application without direct hand manipulation
2Volume of moving object
If the hub is recessed deeply within the pulley, then the rotational coupling device structure is compact, but conventional tools cannot reach the hub to prevent rotation during fastener tightening
Solution Approach 1:
The solution transitions from radial tool access to axial tool access, allowing the installation tool to reach the hub through the axial dimension while maintaining device compactness in the radial direction
3Ease of manufacture
If the shaft is allowed to rotate during fastener tightening, then the fastener can be rotated to tighten, but the shaft and rotational coupling device become misaligned and desired torque cannot be achieved
Solution Approach 1:
The installation tool applies preliminary anti-action by engaging the hub flange and preventing rotation before and during fastener tightening, counteracting the rotational tendency of the shaft and fastener system
Solution Approach 2:
The installation tool is positioned and engaged with the hub in advance of fastener tightening, establishing the anti-rotation constraint before the tightening process begins
Data Source
AI summary
A tool for installing a rotational coupling device on a shaft, a rotational coupling device and installation tool kit, and a method of installing a rotational coupling device are provided. The coupling device includes a hub disposed about an axis of the shaft and spaced from the shaft. A bore in the hub is aligned with a bore in the shaft and receives a fastener extending through the hub bore and into the shaft bore. The tool includes a body defining an aperture having a shape complementary to a shape of the hub and defining at least one flat and an arm extending from the body in a direction perpendicular to, and away from, the axis. At least a portion of the arm is axially spaced from the hub allowing the tool to access deeply recessed hubs and prevent rotation of the device and shaft as the fastener is rotated.