Vehicle Joint Device with Rotation-Impeding Means
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Solution Overview
Problem
Comfort-oriented joint devices with elastically deformable layers experience premature slipping and noise emission during torsion due to low pre-stressing, leading to increased wear and reduced durability.
Innovation Solution
Incorporation of rotation-impeding means, such as serrations or adhesives, to prevent twisting between the joint body and housing, ensuring high resistance to failure and comfort even under load, with options for frictional or interlocking mechanisms to inhibit movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the joint device is designed with low axial pre-stressing for comfort, then comfort and acoustic properties are improved, but resistance to twisting and durability deteriorate
Solution Approach 1:
The joint device is segmented into distinct functional zones: an elastically deformable layer for comfort absorption and rotation-impeding means (such as locking features or friction elements) for twisting resistance. This segmentation allows each component to specialize in its function without compromising the other.
Solution Approach 2:
The joint employs composite construction combining materials with different properties: elastic materials for deformability and comfort, paired with harder, more rigid materials for the rotation-impeding means. This composite approach enables simultaneous achievement of comfort and twisting resistance.
2Ease of operation
If the elastically deformable layer is pressed into a recess with low pre-stress, then comfort is improved, but premature slipping and noise emission occur during torsion
Solution Approach 1:
Rotation-impeding means act as an intermediary mechanism between the elastically deformable layer and the housing. These means prevent direct slipping contact that causes noise, while allowing the elastic layer to maintain its comfort-providing deformation capability.
Solution Approach 2:
The rotation-impeding means are pre-configured to counteract twisting forces before slipping can occur. By providing preliminary resistance to rotation, the system prevents the harmful slipping and noise generation that would otherwise occur during torsional loading.
3Ease of operation
If relative movement occurs between the elastomer layer and housing during operation, then comfort is maintained, but wear increases and pre-stressing is reduced
Solution Approach 1:
The joint device applies local quality by allowing relative movement only in specific zones where it benefits comfort, while restricting movement in other zones through rotation-impeding means to prevent wear. This localized control of movement enables simultaneous achievement of comfort and durability.
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 solution effectively prevents slipping and rattling, maintaining high comfort and reducing wear by enhancing the joint's resistance to twisting, even at small rotation angles, and ensuring durability through frictional or interlocking retention.
Implementation Method 1
an elastically deformable layer that radially surrounds this either fully or partially, which layer on its radially outer side is in contact at least in some areas with an outer housing
Implementation Method 2
the ability of the joint body to twist about its longitudinal axis is impeded by rotation-impeding means provided in addition to the contact between the outside of the elastically deformable layer and the housing
Implementation Method 3
radially outward-facing serrations in the manner of knurling can be formed on at least one shell connected to the elastic layer
Data Source
AI summary
A joint device (1) having an axially extending pivot pin (3), in particular a so-termed claw, and an elastically deformable layer (5) that wholly or partially surrounds the pivot pin radially. The deformable layer is at least partially in contact on its radially outer side (6) with a housing (2) and is connected, such as by vulcanization at least at one axial end, with an annular body (7). The pivot pin (3) with the elastically deformable layer (5) and the at least one annular body (7) form a joint body (8) which can move relative to the housing (2) and is designed, in such a manner, that the ability of the joint body (8) to rotate about its longitudinal axis (9) is inhibited by a rotation-impeding device (10) and by the contact of the outside (6) of the elastically deformable layer (5) against the housing.