Cam Phase Adjuster Locking Pin Integration
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Solution Overview
Problem
Existing cam phase adjusters for engine timing systems face challenges in reliably locking the rotor at specific positions due to insufficient hydraulic fluid supply and centrifugal forces causing accidental unlocking.
Innovation Solution
A cam phase adjuster design featuring a stator, rotor, front cover, and locking pins with unlocking flow channels, where the rotor is divided into advance and retard cavities by blades, and locking pins are inserted into matching grooves on the front cover, with hydraulic fluid used to unlock the pins, allowing reliable locking and positioning without altering the oil control valve structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking pins are mounted on the rotor to lock at specific rotation positions, then the rotor can be locked reliably, but the structure becomes more complex and the pins may move outward under centrifugal force causing accidental unlocking
Solution Approach 1:
The locking pin is integrated directly into the rotor body as a fixed structural component rather than a separate movable part. The pin is formed as an integral part of the rotor through machining or molding, eliminating the need for separate mounting mechanisms and reducing structural complexity while maintaining locking reliability.
Solution Approach 2:
The locking pin is pre-positioned and fixed in the rotor at the design stage, ensuring it remains in the correct position during operation. This preliminary positioning prevents the pin from moving outward under centrifugal force, thereby preventing accidental unlocking while maintaining the locking function.
2Reliability
If locking pins are pushed by springs to insert into locking grooves, then the locking mechanism can function, but the structure becomes more complex and requires additional spring components
Solution Approach 1:
The spring component is completely removed from the locking mechanism. Instead of using springs to push the locking pin, the design relies on the geometric shape of the locking groove and the rigid structure of the integrated pin to achieve automatic engagement and locking without any elastic elements.
Solution Approach 2:
The mechanical spring-based pushing mechanism is replaced with a geometry-based locking system. The locking groove is designed with specific angular and radial dimensions that guide the integrated locking pin into the correct position and maintain engagement through geometric constraint rather than elastic force.
3Ease of operation
If the oil control valve structure is changed to supply hydraulic fluid to unlock the rotor, then the rotor can be unlocked, but the device complexity increases
Solution Approach 1:
The existing oil control valve is designed to perform multiple functions: controlling hydraulic fluid flow for both locking and unlocking operations, and regulating pressure in the hydraulic cavities. This multi-functionality eliminates the need for separate unlocking mechanisms or modified valve structures, maintaining simplicity while enabling reliable rotor unlocking.
Solution Approach 2:
The hydraulic system uses its own existing fluid supply and control capabilities to achieve unlocking. The oil control valve directs hydraulic fluid to the appropriate cavities to create pressure that automatically pushes the rotor and integrated locking pin out of the locking groove, using the system's own resources without external intervention or structural modifications.
4Reliability
If multiple locking pins are used to lock the rotor at multiple positions, then the locking reliability improves, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The locking function is segmented into multiple discrete locking pins positioned at different angular locations on the rotor. Each pin independently engages with its corresponding locking groove to secure the rotor at specific positions. This segmentation allows for modular manufacturing where each pin can be independently formed and positioned, simplifying the overall manufacturing process while achieving multi-position locking capability.
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
The solution provides a simple and reliable locking mechanism for the cam phase adjuster, ensuring the rotor is securely positioned at advance, retard, or intermediate positions, enhancing the engine timing system's reliability and efficiency.
Implementation Method 1
the end portion of each locking pin that faces away from the front cover abuts against the bottom of the corresponding mounting hole by means of a corresponding elastic reset member
Implementation Method 2
the locking pin in the corresponding lock groove can be pushed to axially move away from the front cover by a hydraulic fluid from the corresponding advance cavity or retard cavity
Implementation Method 3
the locking pins may move toward the radial outer side under the action of a centrifugal force, thus likely causing accidental unlocking
Data Source
AI summary
The present disclosure relates to a cam phase adjuster that includes a stator, a rotor, a front cover and at least one locking pin. The cam phase adjuster is provided with a plurality of compartments formed between the rotor and the stator, and each compartment is divided into advance cavities and retard cavities in a circumferential direction; each locking pin is mounted in a corresponding mounting hole of the rotor; an end portion of each locking pin that faces away from the front cover abuts against the bottom of the corresponding mounting hole by means of a corresponding elastic reset member; an end face of the front cover that faces the rotor is provided with at least one locking groove which matches the at least one locking pin; the end portion of each locking pin that faces the front cover can be axially inserted into the corresponding locking groove; and the front cover is provided with an unlocking flow channel which fluidly connects the corresponding locking groove to one advance cavity or retard cavity.