Valve Timing Control Device Torsion Spring Posture Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve opening and closing timing control devices face issues with torsion spring posture stabilization, leading to potential inclination and reduced device performance due to complex processing and increased size, as well as the need for strong hooks and increased device size to prevent torsion spring movement.
Innovation Solution
A valve opening and closing timing control device with a torsion spring disposed outside the lid member, where a restricting projection portion corrects the torsion spring's movement along the rotational axis, ensuring stable posture and preventing relative inclination between the driving-side and driven-side rotating bodies, and utilizing a lock mechanism with a lock recessed portion and lock member for phase control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spiral groove is formed on the front plate to stabilize the torsion spring posture, then the torsion spring posture is stabilized, but the processing becomes complicated
Solution Approach 1:
The patent extracts the torsion spring stabilization function from the front plate by providing a dedicated stabilizing member (cylindrical stabilizer) that separates the stabilization function from the structural function of the front plate. This allows the front plate to focus on its primary structural role while the stabilizing member handles posture stabilization, simplifying the front plate design and processing.
Solution Approach 2:
The patent introduces a stabilizing member as an intermediary element between the torsion spring and the front plate. This stabilizing member acts as a mediator that provides the necessary frictional engagement to stabilize the torsion spring posture without requiring complex processing of the front plate itself.
2Stability of the object's composition
If multiple ribs are provided radially inside the bush to correct torsion spring posture, then the torsion spring posture is corrected, but the device size increases and strength requirements increase
Solution Approach 1:
The patent extracts the posture stabilization function from the bush structure by providing a dedicated stabilizing member. This eliminates the need for multiple radial ribs inside the bush, allowing the bush to maintain its original compact size while the stabilizing member provides the necessary posture correction functionality.
Solution Approach 2:
The stabilizing member serves multiple functions: it stabilizes the torsion spring posture, provides frictional engagement to prevent inclination, and maintains a compact profile. This multi-functional element replaces the need for multiple ribs, achieving posture stabilization without increasing device volume.
3Reliability
If the torsion spring is housed in the bush with pin-like hook engagement, then the torsion spring is retained, but the hook and front plate require increased strength and device size increases
Solution Approach 1:
The patent introduces a stabilizing member as an intermediary that provides frictional engagement with the torsion spring. This distributed frictional contact replaces the concentrated load on the pin-like hook, reducing the strength requirements for the hook and front plate while maintaining reliable torsion spring retention.
Solution Approach 2:
The patent changes the engagement mechanism from concentrated mechanical hook engagement to distributed frictional engagement through the stabilizing member. This parameter change in the engagement mechanism reduces peak stresses and strength requirements while maintaining retention 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
The solution stabilizes the torsion spring posture, prevents relative inclination, and reduces device size while maintaining performance, allowing for easier assembly and increased durability through thermal hardening and efficient use of components.
Implementation Method 1
a torsion spring that is disposed outside the lid member and exerts a biasing force to the driving-side rotating body and the driven-side rotating body
Implementation Method 2
a restricting projection portion for restricting a movement of the torsion spring in the direction of the rotational axis is formed to protrude from a side opposite to the lock recessed portion in the lid member
Data Source
AI summary
A valve opening and closing timing control device includes: a driving-side rotating body synchronously rotated with a crankshaft of an engine and having a lid member fixed in a direction of the rotational axis; a driven-side rotating body integrally rotated with a camshaft for opening and closing a valve on the same rotational axis; a lock mechanism having a lock member moving in the direction and a lock recessed portion formed inside the lid member and into which the lock member is able to be fitted; and a torsion spring disposed outside the lid member and exerting a biasing force to the driving-side and driven-side rotating bodies, wherein a restricting projection portion for restricting a movement of the torsion spring in the direction is formed in the lid member.