Valve Timing Rotor Vane Design for Press-Insertion Stress Management
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Solution Overview
Problem
Conventional valve timing control apparatuses face issues with deformation of the engage hole in the vane rotor due to stress from the press-insertion of the spring plate, leading to misalignment of the camshaft and dimensional tolerance problems, which affect the proper insertion and operation of the valve timing control system.
Innovation Solution
The design incorporates a rotor vane with alternating thick and thin portions, where the bushing vane is press-inserted with a compression margin only relative to the thin portions, reducing stress and deformation, and maintaining the engage hole's dimension by restricting deformation to the vicinity of the press-insertion hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spring plate is press-inserted into the press-insertion hole of the vane rotor, then the vane rotor is integrated with the spring plate, but stress is applied to the vane rotor causing deformation in the engage hole
Solution Approach 1:
The vane rotor is designed with alternating thick portions and thin portions around its circumference. The thick portions are positioned to bear the press-insertion stress from the spring plate, while the thin portions allow localized deformation. This non-uniform thickness distribution concentrates the deformation in specific regions away from the engage hole, maintaining the engage hole's dimensional tolerance while still achieving strong integration of the spring plate.
2Strength
If the thick portion of the vane rotor deforms under stress, then the structural integrity is maintained, but the deformation exerts influence to distant portions such as the engage hole
Solution Approach 1:
By creating localized thin portions in the vane rotor, the design allows stress-induced deformation to occur preferentially in these thin regions rather than propagating through the entire structure. The thick portions maintain structural integrity and bear the load, while the thin portions act as deformation zones that isolate the engage hole from distant deformation influences, preserving positioning accuracy.
Solution Approach 2:
The vane rotor's circumference is segmented into alternating thick and thin portions, creating distinct functional zones. This segmentation allows different parts of the rotor to serve different purposes: thick portions for structural strength and load bearing, thin portions for controlled deformation. This segmentation prevents uniform stress distribution that would otherwise cause widespread deformation affecting the engage hole.
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 design enhances the reliability and productivity of the valve timing control apparatus by preventing excessive deformation of the engage hole, ensuring proper camshaft insertion and maintaining dimensional accuracy, thereby improving the overall operation and manufacturing efficiency.
Implementation Method 1
a torsion coil spring which biases the vane rotor in a specific rotative direction with respect to the housing member
Implementation Method 2
a hydraulic device rotates the vane portion, accommodated in the hydraulic chamber, relative to the housing member
Data Source
AI summary
A valve timing control apparatus includes a driven shaft for actuating an intake valve and/or an exhaust valve of an engine. A housing member rotates together with a driving shaft of the engine. A rotor member is accommodated coaxially in the housing member for rotating together with the driven shaft. The rotor member is rotatable with respect to the housing member. The rotor member includes a rotor vane that circumferentially has a thick portion and a thin portion. The thick portion is greater than the thin portion in radial thickness. The rotor member further includes a bushing vane, in a substantially cylindrical shape, having one end. The one end is connectable to the rotor vane through a press-insertion hole with a compression margin relative to the thin portion. The one end is connectable to the rotor vane through a press-insertion hole without a compression margin relative to the thick portion.