Camshaft Phaser Bushing for Check Valve Plate Orientation
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Solution Overview
Problem
The assembly of camshaft phasers is complex and costly due to the lack of features that maintain the desired orientation of the check valve plate with respect to the locking plate, requiring extra steps that are not always successful.
Innovation Solution
A camshaft phaser design that includes a bushing disposed in the bore of the locking plate and through-bore of the check valve plate, which extends past the locking plate to block movement of the check valve plate in radial and circumferential directions, ensuring correct positioning during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the check valve plate overlaps the bushing without positioning features, then the assembly structure is simpler, but the manufacturing precision and reliability of plate orientation deteriorate
Solution Approach 1:
The bushing serves as an intermediary component between the locking plate and check valve plate. By extending past the locking plate in the axial direction, it provides a positioning surface that maintains the desired orientation of the check valve plate relative to the locking plate during assembly, eliminating the need for additional positioning features while ensuring manufacturing precision.
2Manufacturing precision
If extra assembly steps are added to maintain plate orientation, then the manufacturing precision improves, but the device complexity and assembly time increase
Solution Approach 1:
The bushing is pre-positioned and extends past the locking plate before the check valve plate is installed. This preliminary positioning action ensures that when the check valve plate is placed, it automatically achieves the correct orientation relative to the locking plate without requiring additional alignment steps or procedures during assembly.
3Manufacturing precision
If the bushing extends past the locking plate, then the check valve plate positioning is improved, but the use of energy and material consumption increase
Solution Approach 1:
The bushing extends past the locking plate only in the specific axial direction where positioning is needed, rather than uniformly in all directions. This localized extension provides the necessary positioning function while minimizing material consumption compared to a fully extended or symmetric design.
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 bushing effectively maintains the correct orientation of the check valve plate with respect to the locking plate, simplifying the assembly process and reducing the need for additional measures that increase complexity and cost.
Implementation Method 1
The bushing blocks movement of the check valve plate, with respect to the locking plate, in a radial direction with respect to the longitudinal axis or in a circumferential direction with respect to the longitudinal axis
Implementation Method 2
For fluid pressure in space 218 greater than fluid pressure in chamber 216, fluid in space 218 is arranged to displace flap 220 of plate 210 in axial direction AD1
Implementation Method 3
fluid from space 218 flows to chamber 216 through through-bore 222
Data Source
AI summary
A camshaft phaser, including: an axis of rotation; a stator including a radially outermost surface with a plurality of teeth; a locking plate including a first side facing in a first axial direction, a bore in the first side, and a through-bore; a check valve plate axially located between the locking plate and the stator and including a through-bore and a displaceable valve flap aligned, in the first axial direction, with the through-bore for the locking plate; and a bushing disposed in the bore in the first side and in the through-bore for the check valve plate. The bushing extends past the locking plate in the first axial direction.