Swivel Cap Actuator for Hydraulic Cylinder Misalignment
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Solution Overview
Problem
Hydraulic cylinders face rod failure due to misalignment-induced bending moments and side loading, which existing solutions have not adequately addressed, leading to premature failure and increased costs.
Innovation Solution
A swivel cap design with a raised domed portion and a base portion that tilts relative to the rod to minimize contact and distribute loads centrally, reducing bending moments and providing visual indicators for maximum tilt angles to prevent overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional rigid cap design is used, then manufacturing is simple, but bending moments cause stress on the rod leading to failure
Solution Approach 1:
The cap design incorporates a raised domed portion that allows dynamic tilting relative to the rod axis, enabling the cap to adapt to misalignment conditions. This dynamic adjustment reduces bending moments on the rod while maintaining structural integrity, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The raised domed portion of the cap features a curved spherical surface that contacts the rod. This curvature allows the cap to pivot and tilt smoothly, accommodating angular misalignment without creating stress concentration points, thereby preventing rod failure while keeping the design relatively simple.
2Reliability
If the swivel cap tilts to accommodate misalignment, then bending moments are reduced, but side movement increases
Solution Approach 1:
The cap design concentrates the tilting function specifically at the raised domed portion while keeping the base cap structure stable. This localized movement allows the cap to accommodate misalignment through controlled tilting at the dome interface, minimizing overall side movement of the entire cap assembly.
3Ease of operation
If visual indicators for maximum tilt are added, then operational safety improves, but manufacturing complexity increases
Solution Approach 1:
The cap incorporates visual indicators (such as colored rings or markings) that indicate the maximum tilt angle. These indicators provide clear visual feedback to operators about safe operating limits, improving ease of operation while adding minimal complexity to the manufacturing process through simple additive features.
Data Source
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AI summary
An actuator is provided. The actuator includes a rod having a socket portion at one distal end of the rod and a swivel cap. The swivel cap includes a base portion having an inner surface and an outer surface and a raised domed portion disposed on the inner surface of the base portion. The outer surface has an origin of the radius at the center of the plane that defines the outer surface of the base portion. The raised domed portion is mounted on the socket portion of the rod and has an origin of the radius on the plane that defines the outer surface of the base portion. A raised region is located on at least one of the raised domed portion or the socket portion. The swivel cap tilts relative to the rod in response to angular misalignment with a load to a tilt angle.