Camshaft Adjuster Blocking Pin Hydraulic Pressure Relief
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Solution Overview
Problem
Existing camshaft adjusters face high flow resistance due to complex switching valves, leading to slow switching times between blocking and unblocking positions, especially when the engine starts or stops, requiring a faster and safer hydraulic channel closure or opening towards the recovery tank.
Innovation Solution
A simplified design where the blocking pin and locking cover act as direct sealing elements, with the blocking pin being displaceable between two end positions based on hydraulic pressure, allowing for a compact and rapid switching mechanism, and including a pressure relief valve to manage hydraulic pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex switching valves are used to control the hydraulic channel, then the hydraulic channel can be reliably controlled, but the flow resistance increases and switching time becomes excessively long
Solution Approach 1:
The patent extracts and eliminates the complex switching valve from the hydraulic control system. Instead of using a separate switching valve component, the invention uses the blocking pin directly positioned within the hydraulic channel to control fluid flow. This extraction of the unnecessary intermediate component reduces flow resistance and eliminates the time delay associated with complex valve mechanisms, while maintaining reliable hydraulic channel control through the simplified blocking pin design.
Solution Approach 2:
The blocking pin serves multiple functions simultaneously: it acts as both a sealing element and a switching mechanism. By integrating these functions into a single component rather than using separate switching valves and sealing elements, the system achieves reliable hydraulic control with reduced complexity, lower flow resistance, and faster switching response time.
2Reliability
If complex switching valves are used to control the hydraulic channel, then the hydraulic channel can be controlled, but the device complexity increases
Solution Approach 1:
The patent removes the complex switching valve from the system and replaces it with a simple blocking pin mechanism. This extraction eliminates unnecessary components and simplifies the overall device structure while maintaining the essential function of hydraulic channel control through the blocking pin's direct intervention in the fluid path.
Solution Approach 2:
The blocking pin is designed to perform multiple functions within a single component: it seals the hydraulic channel, controls fluid flow direction, and acts as the switching mechanism. This multi-functionality consolidates what would traditionally require multiple separate components (switching valve, sealing elements, control mechanisms), thereby reducing device complexity while maintaining reliable hydraulic control.
3Quantity of substance
If long flow paths are used in the hydraulic channel, then the hydraulic medium can be distributed throughout the system, but the flow resistance becomes excessively high
Solution Approach 1:
The blocking pin acts as an intermediary element that strategically controls the hydraulic medium flow path. By positioning the blocking pin at critical locations within the hydraulic channel, the system enables effective hydraulic medium distribution to where it is needed while avoiding unnecessarily long flow paths. The blocking pin mediates between the need for hydraulic medium distribution and the need to minimize flow resistance by controlling when and where the medium flows.
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 significantly reduces switching times and ensures fast, safe closure or opening of the hydraulic channel, enhancing the camshaft adjuster's responsiveness and efficiency by leveraging the blocking pin's dual-end-position functionality and pressure management.
Implementation Method 1
within a first pressure range prevailing in the hydraulic channel by way of contact with the locking cover
Implementation Method 2
the blocking pin seals the hydraulic channel from the recovery tank
Implementation Method 3
displaceable between the first end position, in which it is situated up to a predetermined, first hydraulic pressure value, and a second end position, in which it is situated upon reaching a second hydraulic pressure value
Implementation Method 4
pushing the locking pin back into the receptacle by the application of pressure medium
Data Source
AI summary
A camshaft adjuster for an internal combustion engine, having a stator, a rotor mounted rotatably in the interior of the stator, and a locking cover connected to the stator. A hydraulically actuatable locking element is received in the rotor and engages into the locking cover in at least one blocking position, so as to block a rotation of the rotor relative to the stator, and is arranged in at least one unlocking position so that the rotor can be rotated relative to the stator. A blocking pin acts in at least one hydraulic channel connected hydraulically to the locking element so that the hydraulic channel is connected to a recovery tank or is disconnected from the recovery tank depending on the position of the blocking pin, wherein the hydraulic channel has a first channel section in the locking cover, and the first channel section and the blocking pin are arranged so that the blocking pin seals the hydraulic channel from the recovery tank in at least one first end position, in a first pressure range which prevails in the hydraulic channel by way of contact with the locking cover.