Vehicle Lock Lever Axial Clearance Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing lock device for vehicles experiences unsmooth rotation of the lock release lever due to potential contact with the cam member during rotation, leading to inefficient lock release operations.
Innovation Solution
The lock device incorporates a straddle portion on the lock release lever that extends over the cam member, with a holding portion for slidable contact, maintaining the cam follower and cam member in a separated state parallel to the rotational support shaft, ensuring smooth rotation and stabilization through double-end support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lock release lever is positioned close to the cam member to reduce space, then the device structure is compact, but the lock release lever may contact the cam member during rotation causing unsmooth operation
Solution Approach 1:
The invention introduces a new spatial dimension by extending the lock release lever in the axial direction (parallel to the rotational axis) to form a straddle portion. This dimensional extension allows the lever to clear the cam member axially, preventing contact during rotation while maintaining compact radial dimensions. The straddle portion creates clearance in the axial direction, resolving the contradiction between compact structure and smooth operation.
2Ease of operation
If the lock release lever rotates freely to achieve smooth operation, then the operation is smooth, but the lever may be affected by external forces causing instability
Solution Approach 1:
The invention segments the support function by introducing multiple support points: the rotational support shaft provides rotational support, while the holding portion provides additional support during rotation. This segmentation of support functions allows the lever to rotate smoothly while being stabilized against external forces, resolving the contradiction between smooth operation and stability.
Solution Approach 2:
The holding portion acts as an intermediary element that mediates between the lock release lever and the support member. It provides slidable contact support that guides the lever during rotation and prevents excessive movement due to external forces, thereby maintaining both smooth rotation and operational stability.
3Reliability
If the cam follower maintains constant contact with the cam surface to ensure force transmission, then the force transmission is reliable, but contact with the cam member body causes friction and unsmooth rotation
Solution Approach 1:
The invention resolves this contradiction by extending the lock release lever axially to create clearance between the cam follower and the cam member body. The cam follower maintains contact with the cam surface for reliable force transmission, while the axial extension prevents contact with the cam member body, eliminating friction and ensuring smooth rotation.
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 design prevents contact between the cam follower and cam member during rotation, ensuring smooth and stable operation of the lock release lever, even under external forces, thus facilitating a seamless lock release process.
Implementation Method 1
a cam member (104) rotatable relative to a support member (81) about a rotational center shaft (102) and having a cam surface (110)
Implementation Method 2
a holding portion (95) formed on one of a portion of the straddle portion (118) that extends over the cam member (104) and the support member (81) to be in slidable contact with the other
Data Source
AI summary
It is an object to obtain a lock device for vehicle which ensures smooth rotation of a lock release lever by preventing the lock release lever from coming in contact with a cam member in a direction substantially parallel to the rotation axis of the lock release lever.The solution therefor is to provide one of a portion of a straddle portion 118 of a lock release lever 115 which is positioned beyond a cam member 104 and a support member 81 with a holding portion 95 which holds a cam follower 119 and a portion of a cam member other than a cam surface 110 thereof in a state of being spaced from each other in a direction parallel to a rotational support shaft 92 by being in slidable contact with the other.