Steering Column Lock Push Release Mechanism
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Solution Overview
Problem
Conventional steering column locking devices with smart key systems fail to prevent the key knob from locking when the solenoid malfunctions, leading to unsafe conditions, especially at high speeds, and cannot function in manual vehicles without a parking range detecting mechanism.
Innovation Solution
A steering column locking device incorporating a mechanical key interlock function using a push release mechanism, which prevents the key knob from moving to the lock position during solenoid malfunctions, ensuring the steering column remains operational even when the electromagnetic key interlock fails, and allows operation in manual vehicles by using a plunger, cam shaft, and return springs to mechanically restrict key knob rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnetic key interlock function using a solenoid is used to prevent the key knob from moving to the lock position, then the key interlock function can be implemented, but the system becomes vulnerable to solenoid malfunctions which can cause the steering column to lock undesirably
Solution Approach 1:
A mechanical interlock mechanism is introduced as an intermediary between the key knob and the lock position. This mechanical system includes a plunger that can be pushed to engage with a cam shaft, physically preventing the key knob from rotating to the lock position. The mechanical intermediary provides a fail-safe backup that operates independently of the electromagnetic solenoid system.
Solution Approach 2:
The mechanical interlock mechanism is designed to provide beforehand protection against solenoid failures. By having a pre-configured mechanical blocking system that can be manually activated, the patent ensures that even if the electromagnetic system fails, there is a pre-prepared protective measure in place to prevent undesired locking.
2Reliability
If a mechanical key interlock function is added to provide fail-safe protection, then reliability against solenoid failure improves, but the device complexity increases
Solution Approach 1:
The mechanical interlock components (plunger, cam shaft, return spring) are integrated into the existing steering column locking device housing and key knob assembly. The mechanical interlock shares space and structural elements with the electromagnetic system, merging two safety mechanisms into a unified compact structure rather than adding completely separate systems.
Solution Approach 2:
The plunger serves multiple functions: it acts as both a mechanical block to prevent locking and a component that can be pushed by the user to manually disengage the lock. The cam shaft serves dual purposes in the key rotation mechanism and as a mechanical interlock element. This multi-functionality reduces the need for additional dedicated components.
3Adaptability or versatility
If the key interlock function relies on detecting the gear shift lever position, then the key interlock can prevent locking when the vehicle is moving, but the function cannot be implemented in manual vehicles without a parking range detecting switch
Solution Approach 1:
The mechanical interlock system is designed to be manually operated by the user without requiring any external detection systems. The user can directly push the plunger to engage or disengage the mechanical block, making the system self-sufficient and adaptable to any vehicle type regardless of whether automated detection systems are present.
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 mechanical key interlock function effectively prevents the steering column from locking undesirably during solenoid malfunctions, ensuring safe vehicle operation and enabling the system to function in manual transmission vehicles, thereby preventing accidents and enhancing safety.
Implementation Method 1
A return spring is provided between the plunger and the cam shaft to elastically support the plunger such that the plunger is biased towards the key knob
Data Source
AI summary
A steering column locking device has an electromagnetic key interlock function that operates a solenoid to prevents a key knob from being undesirably moved to a lock position, as well as a mechanical key interlock function to conduct the key interlock function even when the solenoid malfunctions. The device includes the key knob and a plunger coupled to the key knob, so that when a user manipulates the key knob to start the vehicle, the plunger both moves axially and rotates. A cam shaft is coupled to the plunger, and a return spring is provided between the plunger and the cam shaft to bias the plunger towards the key knob. A stroke restrictor restricts a stroke of the plunger in the axial direction, and a push release functioning mechanism mechanically prevents the plunger from rotating from an accessory position to a lock position when the key interlock function fails.