Vehicle Door Unlocking Assembly with Cam Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional door unlocking assemblies for vehicles require significant force and lack versatility, leading to impractical use and a high risk of damage due to concentrated stresses on locking components, especially under varying operating conditions.
Innovation Solution
A controlled unlocking assembly featuring a base coupled to the door, a rotatable handle with anchoring means, and a locking button that can be actuated through direct pressure or indirect traction via an additional actuation element, allowing multiple release methods and reducing the force required for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a button or end portion mechanism is used to prevent accidental release, then door security is improved, but the force required to operate the handle becomes considerable
Solution Approach 1:
A cam mechanism acts as an intermediary between the handle and the locking mechanism. The cam's inclined surface converts a small pulling force on the handle into a large force that moves the locking element, reducing the direct force requirement while maintaining secure locking
Solution Approach 2:
The system changes the mechanical advantage parameter through the cam profile design. By varying the cam angle and radius, the force transformation ratio can be optimized to provide sufficient locking force while requiring minimal operating force from the user
2Reliability
If conventional locking mechanisms are used, then door security is maintained, but the assembly lacks versatility for different operating conditions
Solution Approach 1:
The handle assembly is designed with multiple functional elements: a primary handle for normal operation, an integrated key cylinder for locked access, and a panic release mechanism. This multi-functionality allows the same assembly to serve different security needs and operating conditions without requiring separate mechanisms
Solution Approach 2:
The system transitions from a static locking mechanism to a dynamic one where the cam can be actuated in multiple ways (manual pulling, key operation, or panic release). This dynamic capability allows adaptation to different operating scenarios while maintaining a unified structural design
3Device complexity
If stress is concentrated at the contact point between locking components, then the locking mechanism remains simple, but damage and breakage occur after prolonged use
Solution Approach 1:
The locking force is segmented and distributed through the cam profile across a broader area of the locking element rather than concentrated at a single point. This segmentation of stress distribution reduces wear and prevents breakage while maintaining the simplicity of the overall mechanism
Solution Approach 2:
The cam profile is designed with rounded transitions and adequate material thickness to cushion and absorb repeated stress cycles before they can cause damage. This preemptive design approach prevents fatigue failure and breakage during prolonged use
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An assembly for the controlled unlocking of doors (A) of vehicles, of the type of vans, trucks, lorries, semi-trailer trucks, trailers and the like, which comprises a base (2) that can be stably coupled to the door (A) and a handle (3) that can be fixed to at least one bar (B). The bar (B) can in turn be rotatably coupled to the door (A) and supports respective means of anchoring to the frame of the vehicle. The handle (3) is rotatable with respect to the base (2) between at least one locked configuration, in which the anchoring means can be engaged with the frame of the vehicle, for the locking of the door (A), and at least one released configuration, in which the anchoring means are disengaged from the frame of the vehicle, in order to permit the free rotation and opening of the door (A). The base (2) is rotatably coupled to a locking button (4), which can move reversibly, in a first release method determined by a direct pressure exerted on the locking button (4), from a first angular position, in which it is kept in interference with the rotation of the handle (3), in order to prevent the opening of the door (A), to a second angular position, in which it is disengaged from the handle (3). The assembly comprises an additional actuation element (5) for the locking button (4), which can be selectively activated for the reversible actuation of the transition of the locking button (4) from the first angular position to the second angular position, so as to define a second release method of the handle (3) and obtain as a consequence an increase in the versatility of the assembly (1).