Damper device
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Solution Overview
Problem
The existing damper device for refrigerators generates abnormal noise due to interference between the sector gear and the partially toothless gear when the turning center axial line of the sector gear is inclined, which occurs during the engagement process.
Innovation Solution
The damper device incorporates a partially toothless gear with an outer peripheral part having a curved outer peripheral face along the tooth tip circle and a second tooth that abuts with the outer peripheral face of the sector gear, preventing the sector gear from turning and thus avoiding interference and noise generation, even when the turning center axial line is inclined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sector gear is designed with standard straight teeth, then the gear structure is simple and easy to manufacture, but interference and abnormal noise occur when the turning center axial line is inclined during engagement
Solution Approach 1:
The patent applies curvature principle by designing the outer peripheral face of the partially toothless gear with a curved surface that follows the tooth tip circle arc. This curved outer peripheral face ensures that when the second tooth of the sector gear abuts against it, the contact point remains consistently on the outer peripheral side even when the turning center axial line is inclined, preventing interference with the tooth tip circle and eliminating abnormal noise during engagement
2Stability of the object's composition
If the outer peripheral part length is made longer, then the abutting surface area increases improving stability, but the end face position moves beyond the midway point interfering with gear engagement
Solution Approach 1:
The patent applies parameter optimization by precisely controlling the length of the outer peripheral part so that its end face is positioned exactly at the midway point of the teeth part in the axial line direction. This parameter setting ensures sufficient abutting stability while preventing the end face from extending beyond the midway point, thereby avoiding interference with the engagement between the first tooth and the tooth tip circle
Data Source
AI summary
A damper device may include a baffle to open/close an opening part; a motor; and a gear train connecting the motor and the baffle and including a partially toothless gear and a sector gear. The partially toothless gear may include an outer peripheral part so as to have an outer peripheral face curved along a tooth tip circle of the teeth part. The outer peripheral part may include an end face at a midway position of the teeth part in the axial line direction where a length in the axial line direction is shorter than a tooth width of the teeth part. The sector gear may include a first tooth cut out facing the outer peripheral face and configured to enter in to an inner peripheral side of the tooth tip circle. A second tooth disposed adjacent to the first tooth and configured to abut the outer peripheral face.