Concentric Camshaft Phaser Radial Runout Control
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Solution Overview
Problem
Concentric camshaft phasers in diesel engines face challenges with precise radial runout control and reliable radial load transfer due to tolerance variations introduced by intermediate components, affecting gear durability and timing.
Innovation Solution
A concentric camshaft phaser design where the control gear is directly fixed to the camshaft using a weld, press fit, or shrink fit, eliminating intermediate components and incorporating a rotor and stator with fluid-filled chambers to control the circumferential position and directly transmit torque and radial loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If intermediate components (fasteners) are used to secure the control gear to the camshafts, then the assembly is easier to manufacture, but the radial runout precision deteriorates due to tolerance variations
Solution Approach 1:
The patent removes intermediate fastening components from the assembly, directly connecting the control gear to the camshaft through a unified structure. This eliminates the tolerance accumulation that would occur with multiple fastening interfaces, thereby resolving the contradiction between ease of manufacture and radial runout precision.
Solution Approach 2:
The control gear and camshaft are merged into a single integrated component structure, eliminating the need for separate fasteners. This consolidation removes the additional tolerance layers introduced by intermediate components, achieving both manufacturing simplicity and high precision radial runout control.
2Device complexity
If intermediate components are used to connect the control gear to the camshafts, then the device complexity is reduced, but the gear durability deteriorates due to less precise circumferential location
Solution Approach 1:
Intermediate fastening components are extracted from the system, resulting in a simpler overall structure while simultaneously improving gear durability through more precise circumferential positioning of the control gear on the camshaft.
Solution Approach 2:
By merging the control gear and camshaft into a directly connected unified structure, the patent reduces component count while enhancing reliability through eliminated tolerance variations that would otherwise compromise gear durability.
3Ease of manufacture
If intermediate components are used to transfer gear loads to the camshafts, then the manufacturing process is simplified, but the radial load transfer reliability deteriorates
Solution Approach 1:
Intermediate load transfer components are removed from the design, creating a direct load path from the gear to the camshaft. This simplification actually improves radial load transfer reliability by eliminating potential failure points and tolerance-related load distribution issues.
Solution Approach 2:
The direct merging of the control gear with the camshaft structure creates an integrated load transfer path, improving reliability by ensuring consistent and predictable radial load transmission without the interference of intermediate components.
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 precision of radial runout control and ensures reliable, durable, and repeatable operation by eliminating tolerance variations and indirect load transfer, improving the overall performance of the camshaft phaser.
Implementation Method 1
a control gear in contact with the first camshaft and fixedly connected to the first camshaft by a weld, a press fit, or a shrink fit
Implementation Method 2
a control gear in contact with the first camshaft and fixedly connected to the first camshaft by a weld, a press fit, or a shrink fit
Implementation Method 3
a control gear in contact with the first camshaft and fixedly connected to the first camshaft by a weld, a press fit, or a shrink fit
Implementation Method 4
a plurality of chambers at least partially formed by the rotor and the stator and arranged to receive fluid at different pressures to circumferentially displace the rotor with respect to the stator
Data Source
AI summary
A concentric cam shaft phaser, including: a first camshaft; a second camshaft located radially inside of the first camshaft; a control gear in contact with the first camshaft and fixedly connected to the first camshaft by a weld, a press fit, or a shrink fit; a rotor non-rotatably connected to the second camshaft; and a stator non-rotatably connected to the control gear.