Camshaft Adjustment Device Vacuum Locking Prevention
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Solution Overview
Problem
Camshaft adjusting apparatuses face issues with inadvertent locking due to vacuum generation in pressure chambers during phase angle adjustment, particularly at low pressure medium temperatures and high viscosity, leading to malfunction.
Innovation Solution
Incorporating a shut-off device in the pressure medium connection between the pressure space, locking device, and regulating device to prevent vacuum propagation, ensuring reliable locking and preventing inadvertent locking by allowing pressure medium flow only in the direction of the locking device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure medium is supplied to the pressure space and locking device through a common pressure medium connection, then the device complexity is reduced, but vacuum propagation can occur causing inadvertent locking
Solution Approach 1:
The patent divides the common pressure medium connection into separate supply lines: one for the pressure space and another for the locking device. This segmentation prevents vacuum propagation from the pressure space from affecting the locking device, thereby maintaining locking reliability while managing device complexity through structured separation.
Solution Approach 2:
The patent introduces a check valve as an intermediary element in the pressure medium connection. This check valve allows pressure medium to flow freely to both the pressure space and locking device during normal operation, but prevents vacuum propagation from the pressure space from reaching the locking device, thus protecting against inadvertent locking.
2Productivity
If a large pressure medium volume flow is required for adjustment, then the adjustment speed is improved, but vacuum generation in the pressure space increases
Solution Approach 1:
The check valve acts as a mediator that decouples the pressure space from the locking device's pressure medium supply. This allows large pressure medium volume flows to be supplied to the pressure space for rapid adjustment without creating vacuum conditions that would propagate to the locking device and cause inadvertent locking.
Solution Approach 2:
By segmenting the pressure medium supply into independent lines with a check valve, the system enables high flow rates to the pressure space while isolating the locking device from vacuum effects, thus maintaining both adjustment speed and locking reliability.
3Strength
If pressure medium temperature is low and viscosity is high, then the lubrication effect is improved, but vacuum propagation to the locking device is promoted
Solution Approach 1:
The check valve serves as a protective intermediary that allows the benefits of cold, high-viscosity pressure medium (good lubrication) to be maintained in the pressure space while simultaneously preventing vacuum propagation to the locking device, thus preserving both lubrication quality and locking reliability.
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
Prevents inadvertent locking and maintains adjustment speed by blocking pressure medium flow into the pressure space, ensuring reliable mechanical coupling and phase angle adjustment without impairment.
Implementation Method 1
a vacuum may be generated in the pressure chambers to be filled, which vacuum can propagate via the pressure medium connection into the locking mechanism
Implementation Method 2
low pressure medium temperatures prevailing in the pressure medium system with high viscosity of the pressure medium
Implementation Method 3
at least one pressure space which can be charged with pressure medium, and also having at least one locking device which can be actuated using pressure medium
Data Source
AI summary
A camshaft adjustment device which has a pinion and a drive part that is disposed in a pivoting manner relative thereto. The pinion and the drive part are operatively connected to each other via a pressure chamber that can be pressurized using pressure means. At least one locking device can mechanically couple the pinion and the drive part. The locking device is actuated by of a pressure medium. The pressure chamber and the locking device are in a pressure medium connection to one another for regulating the pressure medium supply to the locking device and the pressure medium discharge therefrom by at least one regulating unit. The passage of the pressure medium can be blocked in a pressure-tight manner in the direction of the pressure chamber by at least one locking device disposed in the pressure medium connection.