Compensating Axle Distance in Valve Timing Gears
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Solution Overview
Problem
During repairs or overhauls of internal combustion engines, changes in center distances between the crankshaft and camshaft can disrupt the precise meshing conditions of spur gears, leading to issues with smooth operation and valve timing control.
Innovation Solution
The use of a modified intermediate gear with different toothing configurations, such as a single-track or multi-track replacement gear, allows for precise compensation of center distance changes, ensuring exact tooth meshing conditions and maintaining robust construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing surface of the cylinder head is reworked during repairs, then the smooth-running and sealing performance are improved, but the center distance between crankshaft and camshaft changes adversely, disrupting gear meshing conditions
Solution Approach 1:
The patent applies parameter changes by modifying the toothing configuration of the intermediate gear (changing the number of teeth, tooth profile, or gear ratio) to compensate for the changed center distance. When the sealing surface is reworked and the center distance changes, a replacement intermediate gear with adjusted parameters restores the correct meshing conditions between the crankshaft spur gear and camshaft spur gear.
Solution Approach 2:
The patent introduces dynamics by making the intermediate gear replaceable and adaptable. Instead of a fixed, single-configuratio gear, the system allows dynamic adjustment by selecting different intermediate gears with varying toothing configurations to match different center distance conditions arising from repair work.
2Adaptability or versatility
If a portable bearing journal with rockers is used to compensate for center distance changes, then the adaptability to center distance changes is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the complexity by removing the portable bearing journal, rockers, and pivotable mechanisms from the system. Instead of using a complex mechanical adjustment mechanism, the solution simplifies the approach by directly replacing the intermediate gear with different toothing configurations to achieve center distance compensation.
Solution Approach 2:
The patent applies this principle by using simple, replaceable intermediate gears with different toothing configurations rather than complex, expensive adjustment mechanisms. The intermediate gear acts as a simple, swapable component that can be replaced based on repair needs without requiring elaborate adjustment systems.
3Manufacturing precision
If the intermediate gear toothing is modified to compensate for center distance changes, then the gear meshing conditions are restored, but the manufacturing complexity of the intermediate gear increases
Solution Approach 1:
The patent applies segmentation by dividing the gear system into modular components: the crankshaft spur gear, the intermediate gear, and the camshaft spur gear. The intermediate gear is segmented into different toothing configurations that can be selected based on repair needs, allowing standard manufacturing processes to produce multiple variants without requiring complex custom manufacturing.
Data Source
AI summary
The method involves using a single-track or multi-track exchange intermediate gear (7) in place of an original intermediate gear (6) or in place of an original gear wheel forming a component of the original intermediate gear in case of repair during a preset axle base modification (a) between a crankshaft (10) and a cam shaft (3). The exchange intermediate gear is modified relative to an original gearing such that the axle base modification is balanced in a defined mass. The cam shaft is driven by front gear wheels in a cylinder head (2). An independent claim is also included for a control assembly.