Hydraulic Locking Pin for Camshaft Rotor Timing Control
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Solution Overview
Problem
Current valve timing control apparatuses for internal combustion engines lack efficient mechanisms for controlling the relative rotation between camshafts and output shafts, particularly in terms of locking and unlocking the rotor to adjust cam phasing, which affects the timing of cylinder valves.
Innovation Solution
A valve timing control apparatus that includes a rotor mechanically coupled with a camshaft, where a locking pin is hydraulically operated to lock or unlock the rotor relative to a rotational member, such as a sprocket, allowing for adjustable cam phasing by controlling the hydraulic pressure in advance and retard regions, enabling fast adjustments in valve timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking pin mechanism is used to lock the rotor to the rotational member, then the reliability of valve timing control is improved, but the device complexity increases due to additional hydraulic control components
Solution Approach 1:
The locking pin mechanism utilizes the existing hydraulic pressure from the cam phasing system to actuate the locking and unlocking functions. The hydraulic system serves dual purposes: controlling cam phasing and controlling the locking pin, thereby eliminating the need for a separate hydraulic control system and reducing overall device complexity while maintaining reliability
2Adaptability or versatility
If the rotor is unlocked to allow relative rotation for cam phasing adjustment, then the adaptability of valve timing is improved, but the mechanical stability deteriorates due to potential relative movement between camshaft and output shaft
Solution Approach 1:
The system dynamically switches between two states: locked state for mechanical stability during normal operation, and unlocked state for cam phasing adjustment when timing changes are required. The locking pin enables this dynamic transition, allowing the system to maintain stability when needed while providing adaptability when required
Solution Approach 2:
The locking pin is positioned and ready to engage or disengage based on the phasing requirement. Before cam phasing adjustment begins, the locking pin is retracted to permit rotation. After adjustment is complete, the locking pin automatically engages to secure the new phase position, ensuring mechanical stability is restored in advance of any potential instability
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 solution provides a compact and efficient mechanism for controlling valve timing, allowing for precise adjustment of cam phasing, thereby optimizing engine performance by enabling quick switching between locked and unlocked positions, reducing mechanical complexity and enhancing operational flexibility.
Implementation Method 1
a locking pin is hydraulically operated to lock or unlock the rotor relative to a rotational member, such as a sprocket, allowing for adjustable cam phasing by controlling the hydraulic pressure in advance and retard regions
Data Source
AI summary
A valve timing control apparatus for a combustion engine according to which a rotational member, such as a sprocket, is driven by said combustion engine, a rotor is mechanically coupled with a camshaft for controlling opening and closing of cylinder valves of said combustion engine, a first configuration is provided in which the rotor is locked to the rotational member; and a second configuration is provided in which the rotor is unlocked from said rotational member. In another aspect an operating method of said valve timing control apparatus for adjusting a valve timing of a combustion engine is provided. The apparatus controls a relative rotation between a camshaft and an output shaft, which can either be prevented or permitted.