Pedal Bearing Alignment Assembly for Smooth Rotation
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Solution Overview
Problem
Existing pedal devices face challenges in ensuring smooth rotation due to potential deviations in the radial positioning of the central axes of the rotatable shaft projections, which can be exacerbated by dimensional tolerance issues.
Innovation Solution
The pedal device incorporates a rotatable shaft with first and second projections that are supported by bearings on the pedal and cover, respectively. The housing and cover are adjusted to coincide the radial positions of the central axes of the bearings, ensuring proper alignment and smooth rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dimensional tolerance of components is strictly controlled to ensure proper alignment of bearing central axes, then rotation smoothness is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces an intermediary adjustment mechanism between the housing and cover that allows for post-assembly alignment correction. The cover can be adjusted relative to the housing to compensate for dimensional tolerances in bearing positions, thereby ensuring proper alignment of the central axes without requiring extremely tight manufacturing tolerances on all components.
Solution Approach 2:
The patent enables adjustment of the radial position parameter of the cover relative to the housing. By allowing the cover to be positioned at different radial offsets, the system can compensate for variations in bearing alignment, maintaining rotation smoothness while accommodating normal manufacturing tolerances.
2Manufacturing precision
If high dimensional accuracy is required for bearing positioning, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs alignment adjustment after the main assembly is constructed, rather than requiring perfect alignment during component fabrication. The cover is initially assembled in a convenient position, and then adjusted to the correct radial position to align the bearing central axes, separating the assembly process from the alignment process.
Solution Approach 2:
The patent transforms the static, fixed-position housing-cover connection into a dynamic, adjustable connection. The cover can be moved radially relative to the housing during assembly and then fixed in the adjusted position, allowing alignment to be achieved through movement rather than precise initial positioning.
3Ease of manufacture
If the radial position of bearing central axes is not adjusted, then assembly is simpler, but rotation smoothness deteriorates
Solution Approach 1:
The patent introduces adjustability into the housing-cover connection, allowing the cover to be positioned at different radial locations. This dynamic positioning capability enables the assembler to correct misalignment issues that would otherwise require complex precision manufacturing, maintaining both assembly simplicity and rotation smoothness.
Solution Approach 2:
The adjustable cover acts as an intermediary element that absorbs the misalignment between the housing-mounted first bearing and the pedal-mounted second bearing. By adjusting the cover's radial position, the alignment of both bearings can be optimized without requiring high-precision manufacturing of either the housing or pedal components.
Data Source
AI summary
A pedal device includes a pedal, a rotatable shaft, a cover and a housing main body. The rotatable shaft includes a first projection and a second projection. A first bearing rotatably supports the first projection. A second bearing rotatably supports the second projection. The pedal is supported by the rotatable shaft to enable rotation of the pedal relative to a housing. The cover and the housing main body are fixed relative to each other in an adjusted state where a position of the cover and a position of the housing main body are adjusted such that a radial position of a central axis of the first bearing and a radial position of a central axis of the second bearing coincide with each other.