Torque Limiting Adjuster with Reaction Force Gear Mechanism
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Solution Overview
Problem
Conventional torque limiting adjusters for automotive parts like headlamps often require multiple components, leading to complex designs and higher manufacturing and maintenance costs, as they rely on threaded sleeves to manage torque beyond a predetermined limit position.
Innovation Solution
A torque limiting adjuster with a housing, output shaft, driving gear, and driven gear, where a biasing element engages the gears to transmit rotation, and a second threaded portion allows linear movement, eliminating the need for a threaded sleeve by using a reaction force to overcome the biasing force when the limit position is reached, thus simplifying the design and enhancing robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded sleeve is used to manage torque beyond the limit position, then torque limiting function is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the torque limiting function with the existing gear mechanism by integrating a reaction force generation system into the driven gear assembly. The reaction force member is coupled to the driven gear, allowing the same mechanical components to serve dual purposes: transmitting torque during normal operation and limiting torque when the output shaft reaches its rotational limit, thereby eliminating the need for a separate threaded sleeve component.
Solution Approach 2:
The driven gear assembly is designed to perform multiple functions: it transmits rotational motion from the driving gear to the output shaft during normal operation, and simultaneously generates a reaction force to limit torque when the output shaft reaches its predetermined rotational position. This multi-functionality eliminates the need for dedicated torque-limiting components like threaded sleeves, reducing overall device complexity.
2Manufacturing precision
If multiple components are used to achieve torque limiting, then torque control is precise, but manufacturing and maintenance costs increase
Solution Approach 1:
The patent merges the torque limiting mechanism with the existing gear-driven adjustment system. The reaction force member is integrated into the driven gear assembly, allowing the same components to achieve both precise torque control and cost-effective manufacturing by reducing the total number of parts that need to be manufactured, assembled, and maintained.
3Device complexity
If a threaded sleeve is eliminated, then device simplicity increases, but torque limiting capability may be compromised
Solution Approach 1:
The patent employs a reaction force member that generates a counteracting force to the applied torque. When the output shaft reaches its predetermined rotational position, the reaction force member creates a reaction force that opposes further rotation, effectively limiting the torque without requiring a threaded sleeve. This counterforce mechanism maintains torque limiting capability while simplifying the overall device structure.
Solution Approach 2:
The torque limiting mechanism operates dynamically through the interaction between the driven gear and the reaction force member. As the output shaft rotates, the reaction force member engages at the appropriate moment to generate the limiting reaction force, providing adaptive torque control that maintains reliability while reducing structural complexity.
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 configuration reduces the number of parts, simplifies the device, and prolongs its life cycle by effectively managing torque without a threaded sleeve, providing a robust and cost-effective solution for torque limiting adjustments.
Implementation Method 1
a biasing element arranged to exert a biasing force onto the driving gear against the driven gear so as to engage the driving gear and the driven gear
Implementation Method 2
a second threaded portion located between the first end of the output shaft and the first linear guiding portion and coupled with the first threaded portion of the housing
Implementation Method 3
when the driven gear is forced to rotate beyond the predetermined limit position, the driven gear exerts a reaction force on the driving gear that overcomes the biasing force
Data Source
AI summary
A torque limiting adjuster for adjusting the position of an adjustable part of a lighting device includes a housing, an output shaft, a driving gear, a driven gear, and a biasing element. The housing includes a main opening and a first threaded portion. The driven gear includes a gearing portion adapted to be engaged with the driving gear. The driving and driven gears are engaged by the biasing element. The output shaft has a first linear guiding portion oriented in a main direction and a second threaded portion coupled with the first threaded portion. The driven gear has a second linear guiding portion slidably coupled with the first linear guiding portion. The second linear guiding portion is configured to transmit the rotation of the driven gear to the first linear guiding portion when the driven gear rotates driven by the driven gear. The driven gear exerts a reaction force on the driving gear that overcomes the biasing element when the driven gear is forced to rotate beyond the predetermined limit position.