Clutch Cover Subassembly With Elastic Ring for Wear-Resistant Articulation
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Solution Overview
Problem
Clutch mechanisms in heavy-duty vehicles experience significant wear in the articulation of the diaphragm with the lid, leading to reduced stroke and incomplete disengagement, making it difficult to change gear ratios due to the use of low-wear-resistant steel and assembly challenges with separate annular rings.
Innovation Solution
A sub-assembly featuring a cover with a circular housing and an open elastic ring that can transition between a free and constrained state, using additional retaining means to secure the elastic ring within the cover, made from high-wear-resistant materials, simplifying assembly and ensuring correct positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a toroidal surface is formed directly into the cover by stamping, then the articulation means are made of the same material as the cover (stamping steel with low carbon content), but wear resistance is insufficient leading to peening and wear after large number of clutch disengagements
Solution Approach 1:
The articulation means are divided into two separate components: the cover and the annular ring. The ring is a distinct element that can be made of wear-resistant material while the cover maintains its original material properties, allowing each part to be optimized independently for its specific function and manufacturing process
Solution Approach 2:
The clutch mechanism uses composite construction by combining the cover (made of stamping steel) with an annular ring (made of wear-resistant material such as spheroidal graphite cast iron or steel). This allows the articulation surface to have superior wear resistance while the overall structure maintains its original manufacturing advantages
2Reliability
If a separate annular ring is used for articulation means, then wear resistance is improved, but assembly difficulties arise due to positioning challenges during clutch assembly
Solution Approach 1:
The annular ring is pre-positioned on the cover before the diaphragm is installed. The spacers are also pre-positioned to define the correct location. This preliminary arrangement of components simplifies the final assembly process and ensures proper positioning without requiring complex adjustment procedures
Solution Approach 2:
Spacers are introduced as intermediary elements to facilitate the positioning of the annular ring on the cover. The spacers act as mediators that define the correct location and orientation of the ring, making the assembly process easier and more reliable
3Duration of action of moving object
If the diaphragm joint wears against the cover, then play develops between the joint and diaphragm, but this reduces the stroke of the periphery of the diaphragm and prevents complete disengagement
Solution Approach 1:
The articulation means use composite construction by combining the cover (made of stamping steel) with an annular ring (made of wear-resistant material such as spheroidal graphite cast iron or steel). This allows the articulation surface to have superior wear resistance while the overall structure maintains its original manufacturing advantages
Solution Approach 2:
The wear-resistant annular ring acts as a protective element that prevents wear before it can affect the diaphragm joint. By placing this protective ring in advance at the articulation surface, the design prevents the development of play and maintains complete disengagement capability throughout the service life of the clutch
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 reduces wear and ensures complete disengagement by maintaining the elastic ring in a constrained state, enhancing the reliability and durability of the clutch mechanism while simplifying assembly and maintaining the elastic ring's secure positioning.
Implementation Method 1
an open elastic ring (20) inserted into said circular housing (13) of said cover (12)... The open elastic ring (20) is defined by two operating states: a free state, in which an outer diameter of the ring is greater than a diameter of the housing (13), and a constrained state, in which the outer diameter of the ring is contained within the diameter of the housing (13)
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Subassembly (10) for clutch mechanism (1), comprising: - a cover (12) having a circular housing (13) with axis (O) of revolution, - an open elastic ring (20) inserted in the circular housing (13), the open elastic ring (20) being defined by two operating states: a free state, in which the outside diameter (dA) of the ring (20) is greater than the diameter (dL) of the housing (13), and a constrained state, in which the outside diameter (dA) of the ring (20) is inscribed in the diameter (dL) of the housing (13).