Dynamic Hydraulic Cam Lobe Locking Mechanism
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Solution Overview
Problem
Existing camshaft systems for internal combustion engines lack efficient dynamic phasing and locking mechanisms for cam lobes, limiting the ability to dynamically engage or disengage valves based on specific operational needs.
Innovation Solution
A dynamically locking cam lobe engagement system utilizing a camshaft with key slots and moveable disks, along with a hydraulically actuated pin system, allows for precise angular alignment and locking of cam lobes, enabling timed operation or complete deactivation of valves by controlling pin engagement and hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed camshaft system is used, then the structure is simple and reliable, but the ability to dynamically engage or disengage cam lobes is limited
Solution Approach 1:
The camshaft system is segmented into multiple independent components: the camshaft body, individual cam lobes, moveable disks, and locking pins. Each cam lobe can be independently engaged or disengaged from the camshaft through hydraulic actuation of pins, allowing selective valve control without affecting other lobes. This segmentation enables dynamic adaptability while maintaining a relatively simple overall structure.
Solution Approach 2:
The system transitions from a static fixed camshaft to a dynamic system where cam lobes can be engaged or disengaged during operation. Moveable disks with slots and keys allow cam lobes to be positioned at different angular orientations, and hydraulic pins provide dynamic locking and release capabilities. This dynamic configuration enables real-time adaptation to different operating conditions.
2Adaptability or versatility
If multiple piece rocker arms with locking mechanisms are used, then specific cam lobes can be operated, but the device complexity increases
Solution Approach 1:
The rocker arm system incorporates moveable disks that can dynamically change configuration. The disks contain slots that engage with keys on the camshaft, allowing the rocker arm to lock onto specific cam lobes or disengage entirely. This dynamic capability enables selective operation of different cam lobes without requiring multiple separate rocker arm assemblies.
Solution Approach 2:
Moveable disks with slots and keys act as intermediaries between the camshaft and the rocker arm mechanism. These disks provide the locking and release function that enables cam lobe selection, simplifying the overall system by consolidating the selection mechanism into a single intermediary component rather than requiring complex multi-piece rocker arms with integrated locking mechanisms.
3Adaptability or versatility
If a collapsing follower with rigid dynamic capability is used, then valve actuation can be controlled, but the device complexity increases
Solution Approach 1:
The follower system uses a collapsing mechanism that can transition between a collapsed state (allowing cam lobe disengagement) and an extended rigid state (enabling valve actuation). This dynamic structural change allows the follower to adapt its rigidity based on operational requirements, providing valve actuation control without requiring a completely separate mechanism for each state.
4Adaptability or versatility
If hydraulic actuation systems are added for dynamic locking, then cam lobe engagement flexibility improves, but the device complexity increases
Solution Approach 1:
Hydraulic actuation is used to provide dynamic locking and release of cam lobes. Hydraulic pins can be extended or retracted based on fluid pressure, enabling controlled engagement and disengagement of cam lobes from the camshaft. This hydraulic mechanism provides flexible cam lobe locking with relatively simple actuation, as the hydraulic system can be integrated into the existing moveable disk and pin structure.
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
Enables flexible and efficient dynamic engagement or disengagement of cam lobes, allowing for optimized valve operation based on engine cycles, improving fuel efficiency and reducing mechanical stress.
Implementation Method 1
A hydraulically actuated pin system for dynamic cam lobe fixturing... a spring placed inside the third channel of the second collar enabled to push the second pin toward the fourth channel in the cam lobe when a force exerted by a hydraulic pressure in the first channel and the second channel is less than a force exerted by the spring
Implementation Method 2
a spring placed inside the third channel of the second collar enabled to push the second pin toward the fourth channel in the cam lobe when a force exerted by a hydraulic pressure in the first channel and the second channel is less than a force exerted by the spring
Data Source
AI summary
Poppet valves in an internal combustion engine may be operated intermittently if desired by the selective dynamic locking or unlocking of one or more cam lobes with the shaft that acts as a conventional camshaft when the lobes are locked to it. One or more cam lobes with a small radial clearance ride on a shaft so that an engagement mechanism may be activated as needed to lock the cam lobe to the shaft, thus activating the respective poppet valve. The cam lobe is prevented from moving axially to ensure correct alignment with a follower. A suitable holding device may be used to ensure the non-activated cam lobe(s) is (are) restrained at a suitable orientation relative to the cam follower.