Vehicle Lid Driving Assembly With Nested Rack Speed Multiplication
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Solution Overview
Problem
Existing driving assemblies for vehicle lids, fuel tank lids, and charging ports face challenges with slow opening and closing speeds due to limited rack length and interference with vehicle components, and require increased gear size to enhance speed, which occupies more space.
Innovation Solution
The driving assembly incorporates a fixed gear, a fixed rack, a movable intermediate rack, and a transmission rack, allowing for a shorter rack length and faster movement speed by utilizing a guide rod system and actuator-driven gear rotation to efficiently open and close lids without increasing the assembly's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the rack length is increased to enable the lid to move from closed to open position, then the lid movement function is achieved, but the rack extends out of the lid assembly causing interference with other vehicle components
Solution Approach 1:
The rack is nested within the lid assembly housing, with the rack guide portion providing a constrained path that keeps the rack contained within the assembly boundaries during lid movement, preventing interference with external vehicle components
2Speed
If the gear diameter is increased to achieve faster lid opening or closing speed, then the lid movement speed is improved, but more space inside the lid assembly is occupied
Solution Approach 1:
The actuator input voltage is made variable rather than constant, allowing the rotational speed of the actuator and gear to be dynamically adjusted. By increasing the input voltage, the lid assembly can achieve faster opening or closing speeds without requiring a larger gear diameter, thus maintaining a compact assembly size
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 risk of interference with vehicle components and doubles the opening or closing speed of lids while maintaining a compact assembly size, achieving faster operation without increasing overall dimensions.
Implementation Method 1
an actuator, an output shaft of the actuator rotates to drive the gear to rotate
Implementation Method 2
the gear is coaxially connected to an actuator, an output shaft of the actuator rotates to drive the gear to rotate and in turn drive a rack meshing with a gear to move linearly
Data Source
AI summary
The present disclosure relates to a driving assembly having a fixed gear, a fixed rack, a movable intermediate rack, a movable gear, and a transmission rack. The movable intermediate rack cooperates with the fixed gear such that the movable intermediate rack is capable of being driven to reciprocate when the fixed gear rotates clockwise and counterclockwise; the movable rotary shaft is rotatably fixed to the movable intermediate rack, and the movable gear cooperates with the fixed rack such that the movable gear is capable of reciprocatingly translating along an extension direction of the fixed rack when the movable intermediate rack reciprocates, and the movable gear is capable of rotating about the movable rotary shaft; and the transmission rack is capable of driving a member to be driven. The transmission rack cooperates with the movable gear such that the transmission rack is capable of being driven to reciprocate so as to move the member to be driven when the movable gear rotates clockwise and counterclockwise. In the driving assembly of the present disclosure, the combination of gears and racks enables the transmission rack to have a smaller size and move at a faster speed for the same movement distance.