Swivel Axle Bracket Assembly for Precise, Quiet Skateboard Turning
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Solution Overview
Problem
Conventional four-wheel skateboards suffer from imprecise movements during small-angle turns and generate friction noise due to inadequate assembly of the spring with the housing and axle bracket.
Innovation Solution
A truck assembly with a swivel axle bracket incorporating a coil spring disposed in annular grooves, a mounting pin, and bearings to allow precise movement and reduce noise, featuring a simple structure and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coil spring is inadequately assembled with the housing and axle bracket, then the structure is simpler, but friction noise is generated and movement precision deteriorates
Solution Approach 1:
The patent introduces groove members as intermediary components between the coil spring and the housing/axle bracket. These groove members provide proper positioning and support for the coil spring, preventing direct friction and noise generation while maintaining assembly simplicity. The groove members act as mediators that enable smooth relative movement between components.
2Ease of operation
If the coil spring is inadequately assembled with the housing and axle bracket, then the assembly is easier, but movement precision during small-angle turns deteriorates
Solution Approach 1:
The groove members serve as intermediary components that provide precise positioning for the coil spring during assembly. By guiding the coil spring into proper alignment within the grooves, the assembly process becomes easier while simultaneously ensuring precise movement characteristics during small-angle turns.
3Device complexity
If the grooves are not designed to securely fasten the coil spring, then the structure is simpler, but the skateboard movement becomes imprecise and noisy during use
Solution Approach 1:
The patent applies local quality by designing grooves with specific geometric characteristics at critical locations. The grooves have optimized dimensions and shapes that provide secure fastening of the coil spring exactly where needed, while other portions of the structure remain simple. This localized enhancement of groove design ensures reliable movement stability without overall 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
The swivel axle bracket enhances precision and reduces noise during use by securely fastening the coil spring in grooves, ensuring stable and flexible steering.
Implementation Method 1
the coil spring includes a smaller first end fastened in the annular groove member, and a smaller second end fastened in the upper annular groove; the axle bracket is configured to swivel to twist the coil spring, the twisting of the coil spring stores energy, and in response to the twisting is stopped, the energized coil spring releases energy to turn the axle bracket
Data Source
AI summary
A truck assembly includes a housing including an annular groove member in an underside; an axle bracket including an upper annular groove at an intermediate portion; a coil spring disposed in both the annular groove member and the upper annular groove and including a smaller first end fastened in the annular groove member, and a smaller second end fastened in the upper annular groove; a mounting pin; a first bearing; a second bearing; and a hollow spacer. The mounting pin is driven through the housing, the first bearing, the axle bracket, the second bearing, and the hollow spacer to be secured to a nut so that the axle bracket is configured to swivel to twist the coil spring, and in response to the twisting is stopped, the energized coil spring releases energy to turn the axle bracket to an inoperative position.