Camshaft Adjusting Device Spring Torque Compensation
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Solution Overview
Problem
Camshaft adjusting devices face challenges in efficiently driving auxiliary units without significantly increasing the torque backed up by the camshaft, leading to increased power consumption and brake losses, especially when auxiliary units are driven by the camshaft.
Innovation Solution
Incorporating a spring element between the camshaft and crankshaft to compensate for part of the mean load torque of auxiliary units, allowing the camshaft adjusting device to drive auxiliary units independently of adjusting direction without a substantial increase in backed-up torque, with the spring element's configuration ensuring it does not cancel out the entire camshaft drive torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auxiliary units are driven by the camshaft, then the camshaft can power additional components, but the torque to be backed up by the positioning actuator increases significantly
Solution Approach 1:
A spring element is introduced as an intermediary between the camshaft and the positioning actuator. This spring element stores and releases energy to compensate for the mean load torque of auxiliary units, thereby reducing the continuous torque burden on the positioning actuator while still allowing the camshaft to drive both the auxiliary units and the valve train.
2Reliability
If the positioning actuator constantly applies torque to back up camshaft drive torque, then the camshaft can maintain stable operation, but power consumption increases
Solution Approach 1:
The spring element operates periodically, storing energy during phases when auxiliary unit torque requirements are low and releasing energy when they are high. This periodic energy compensation reduces the need for continuous actuator engagement, thereby lowering power consumption while maintaining stable camshaft operation.
3Ease of operation
If a passive camshaft adjusting device with brake is used, then the camshaft position can be controlled, but brake losses increase
Solution Approach 1:
The spring element acts as a counterweight to the mean load torque generated by auxiliary units. By providing this counterbalancing torque, the spring reduces the workload on the brake system, thereby maintaining camshaft position control capability while significantly reducing brake losses and improving overall system efficiency.
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 configuration reduces power consumption and brake losses by allowing the positioning actuator to solely manage torque adjustments, optimizing fuel efficiency and maintaining the camshaft adjusting device's performance.
Implementation Method 1
a spring element is arranged between the camshaft and the crankshaft and has a spring torque selected so as to compensate for at least part of a mean load torque of a load unit connected to the camshaft
Data Source
AI summary
In a camshaft adjusting device including a positioning actuator for adjusting a phase position of a camshaft with respect to a crankshaft of an internal combustion engine, wherein the camshaft is driven by the crankshaft via a drive input, and a base drive torque of the camshaft is provided by a positioning actuator, a spring element is arranged between the camshaft and the crankshaft and has a spring torque selected so as to compensate for at least part of a mean load torque of a load unit connected to the camshaft to be driven thereby and at most only a part of the base drive torque.