Cam Phaser Compensation Elements for Tolerance Management
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Solution Overview
Problem
Double cam shaft systems require improved tolerance compensation to prevent increased friction and binding due to imprecisions during production and assembly, which can impair the function of cam shaft arrangements.
Innovation Solution
A cam phaser with plural compensation elements evenly distributed in the circumferential direction, configured torsion stiff for smooth torque transfer and flexible in other directions, attached between the stator and drive gear, allowing for axial and angular tolerance compensation, and made from spring steel for enhanced flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double cam shaft system is used with an inner and outer cam shaft, then the valve timing can be adjusted by rotating the outer cam shaft relative to the inner cam shaft, but tolerance deviations during production and assembly cause increased friction and binding between the stator and rotor
Solution Approach 1:
The compensation element changes its physical state between compressed and relaxed conditions to adapt to tolerance deviations. When compressed, it accommodates axial and radial clearance; when relaxed, it maintains precise torque transmission. This parameter change enables the system to handle varying operational conditions without binding.
Solution Approach 2:
The compensation element acts as an intermediary between the stator and rotor, absorbing tolerance deviations and preventing direct contact between mismatched surfaces. This mediator component decouples the rigid stator-rotor connection, allowing relative movement while maintaining torque transmission.
2Reliability
If compensation elements are added to compensate for tolerance deviations, then friction and binding are reduced, but the device complexity increases
Solution Approach 1:
The compensation element is designed as a flexible, disc-shaped component that can be implemented as a thin elastic element. This flexible shell approach provides effective tolerance compensation while minimizing added complexity and space requirements compared to rigid mechanical compensators.
Solution Approach 2:
The compensation function is segmented into a separate, dedicated element rather than being integrated into the stator or rotor. This segmentation allows the compensation mechanism to be optimized independently while maintaining a relatively simple overall structure.
3Device complexity
If the drive gear is integrated with the stator, then the structure is simplified, but tolerance deviations cannot be compensated effectively
Solution Approach 1:
The compensation element serves as an intermediary between the drive gear and stator, allowing the drive gear to be separately attachable while maintaining precise torque transfer. This mediator enables the drive gear to be positioned optimally for torque transmission while accommodating manufacturing tolerances.
Solution Approach 2:
The connection between the drive gear and stator is made dynamic through the compensation element, allowing relative movement and adjustment during operation. This dynamic connection adapts to tolerance deviations while maintaining effective torque transfer, unlike a fixed rigid integration.
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 enables smooth torque transfer without clearance, decouples components, and provides a variable interface that adapts easily, maintaining cam phaser identity and ensuring functional integrity by compensating for tolerance deviations.
Implementation Method 1
at least one compensation element (5) configured to compensate axial and angular tolerances
Implementation Method 2
the compensation elements are configured torsion stiff in the circumferential direction and arranged and attached between the stator and the drive gear that is axially offset from the stator
Data Source
AI summary
A cam phaser for a cam shaft arrangement including an inner cam shaft and an outer cam shaft arranged concentrical relative to the inner cam shaft, the cam phaser including at least one rotor; at least one stator; and at least one compensation element configured to compensate axial and/or radial and/or angular tolerances, wherein the stator is connectable torque proof at least indirectly through a drive gear with the outer cam shaft and the rotor is connectable torque proof with the inner cam shaft, wherein the drive gear is separate from the stator and attachable torque proof at the outer cam shaft, wherein the stator is rotatably supportable on the inner cam shaft, wherein plural compensation elements are provided which are arranged evenly distributed in a circumferential direction, wherein the compensation elements are configured torsion stiff in the circumferential direction and attached between the stator and the drive gear.