Rotatable Axle Damper Mounting for Orthopaedic Joints
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Solution Overview
Problem
Hydraulic damper devices in orthopaedic joint devices face issues with transverse forces and torsional moments due to pivoting and manufacturing inaccuracies, leading to reduced durability and functionality.
Innovation Solution
The orthopaedic joint device features a rotatable axle mounted in radial bearings, such as sliding or needle bearings, which provides precise guidance and decouples transverse forces, preventing torsional moments from being introduced into the damper device, and uses a self-aligning ball or roller bearing in the head to compensate for any misalignment or deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a ball joint bearing is used in the head to compensate torsional moments, then torsional moment compensation is improved, but guidance precision deteriorates due to lack of precision in the guidance of the damper device on the bearing and axle
Solution Approach 1:
The invention divides the bearing system into two separate functional components: a ball joint bearing (9) mounted in the head (8) for compensating torsional moments, and a separate axle (10) with radial bearings for precise guidance. This segmentation allows each component to specialize in its function without compromising the other, resolving the contradiction between torsional moment compensation and guidance precision.
Solution Approach 2:
The axle (10) acts as an intermediary element between the ball joint bearing (9) and the damper device housing. It provides precise guidance while allowing the ball joint bearing to compensate for torsional moments, thereby mediating between the conflicting requirements of precision guidance and torsional moment compensation.
2Stability of the object's composition
If a rigid axle is used fixedly in the upper or lower part, then structural stability is improved, but transverse force tolerance and torsional moment reduction are compromised
Solution Approach 1:
The invention transitions from a fixed rigid axle to a dynamically mounted axle that can rotate independently within radial bearings. This dynamic mounting allows the axle to adapt to transverse forces and torsional moments while maintaining structural stability, resolving the contradiction between stability and force tolerance.
3Ease of manufacture
If a fixed axle mounting is used, then ease of manufacture is improved, but movement precision and resistance to transverse forces are reduced
Solution Approach 1:
The invention segments the mounting system into separate radial bearings that can be independently installed and adjusted. This segmentation maintains ease of manufacture while enabling precise movement control, as each bearing can be optimized for its specific function without compromising the other.
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
This configuration ensures minimal resistance and play-free movement, preventing tilting and twisting of the damper device components, thereby enhancing the durability and functionality of the joint device by eliminating transverse forces and torsional moments, allowing for smooth and long-term operation.
Implementation Method 1
a bearing (9), which is supported on an axle (10)... designed as a ball head bearing... compensate torsional moments around the longitudinal extent of the piston rod and, moreover, to reduce the transmission of transverse forces to the damper device
Implementation Method 2
The axle (10) is mounted rotatably in the upper part (2) or lower part (3)... convert the rotary movement about the joint axis into a linear movement for retracting and extending the piston rod
Implementation Method 3
The axle (10) is mounted in radial bearings, in particular sliding bearings or needle bearings... provide precise guidance with low levels of resistance to movement
Data Source
AI summary
The invention relates to an orthopaedic joint device, comprising an upper part (2) and a lower part (3), which are mounted on one another so as to be pivotable about a joint pin (4) and between which a damper device (5) is situated in order to provide resistance against pivoting of the upper part (2) relative to the lower part (3), and the damper device (5) is mounted on the upper part (2) and the lower part (3) via fastening devices (6, 7), a fastening device (6) comprising a head (8) in which a bearing (9) is situated which is supported on a pin (10) that is mounted in the upper part (2) or lower part (3), characterised in that the pin (10) is mounted so as to be rotatable in the upper part (2) or lower part (3).