Vehicular Door Lock Rotary Member Overshooting Control
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Solution Overview
Problem
Existing vehicular door lock devices face difficulties in accurately switching between locked, unlocked, and unlatched states due to overshooting issues caused by the inertia of the motor's rotation shaft, making it challenging to suitably manage the three states by reversing the electric motor's rotation direction.
Innovation Solution
A vehicular door lock device incorporating a mechanical opening mechanism, an electric motor, a rotary member, a first urging member, an active lever, a release lever, and a block lever, where the rotary member is elastically urged to a neutral position, and the active and block levers engage to prevent overshooting by blocking the rotary member's rotation at specific positions, allowing precise switching between states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotary member rotates from the unlocking correspondent position toward the locking correspondent position to switch from unlocked state to locked state, then the locking function is achieved, but the rotary member may overshoot the locking correspondent position due to inertia and reach the releasing position, causing unintended state switching
Solution Approach 1:
The block lever is positioned in advance at the locking correspondent position to block the rotary member's rotation path before the rotary member reaches that position. This preliminary blocking action prevents the rotary member from overshooting the locking correspondent position and inadvertently reaching the releasing position, thereby ensuring accurate state switching without requiring complex control systems
Solution Approach 2:
The block lever acts as an intermediary mechanical element between the rotary member and the releasing position. It intercepts the rotary member's rotation at the locking correspondent position, preventing direct continuation to the releasing position. This intermediary mechanism provides reliable state switching by physically blocking the erroneous path
2Ease of operation
If the electric motor switches rotation direction to control the rotary member position, then the three states can be managed, but the inertia of the rotation shaft makes precise stopping at correspondent positions difficult
Solution Approach 1:
The block lever automatically engages with the rotary member when the rotary member reaches the locking correspondent position during rotation. This self-engaging mechanism eliminates the need for precise external control to stop the rotary member at the exact correspondent position, as the block lever itself provides the stopping function through its geometric arrangement
Solution Approach 2:
The block lever is pre-positioned at the locking correspondent position to create a physical barrier. When the rotary member rotates toward this position, the block lever intercepts it before overshooting can occur, providing automatic position control without requiring precise motor control
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 accurate and reliable switching between locked, unlocked, and unlatched states by preventing the rotary member from overshooting the locking position, ensuring the latch mechanism is not inadvertently switched to the unlatched state when transitioning from the unlocked to the locked state.
Implementation Method 1
a first urging member configured to elastically urge the rotary member to a neutral position between the first rotation position and the second rotation position
Implementation Method 2
a second urging member configured to elastically urge the block lever in a direction toward the retraction position
Data Source
AI summary
A vehicular door lock device includes a rotary member being movable between a releasing position and an unlocking correspondent position by rotation of an electric motor and being elastically urged to a neutral position, a release lever switching a latch mechanism to an unlatched state by rotation of the rotary member from the neutral position to the releasing position, an active lever switching the vehicular door lock device to an unlocked state by rotational movement of the rotary member from the neutral position to the unlocking correspondent position and switching the vehicular door lock device to a locked state by rotational movement of the rotary member to a locking correspondent position, and a block lever blocking rotational movement of the rotary member from the locking correspondent position to the releasing position when switching from the unlocked state to the locked state is made.