Cooking Knob Ring Assembly for Shaft Eccentricity Compensation
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Solution Overview
Problem
Cooking appliances with rotary knobs for heat source control often experience shaft restraint due to deformation or eccentricity, particularly when the knob is heavy or misaligned, leading to difficulties in manipulation and potential assembly issues.
Innovation Solution
A cooking appliance design featuring a knob ring holder that aligns the center of the knob ring with the knob, allowing radial movement while preventing separation from the panel, using a leaf spring mechanism for secure attachment and preventing rotational movement, thus compensating for shaft eccentricity and preventing restraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavy knob is used to prevent accidental manipulation, then safety is improved, but the knob becomes difficult to manipulate and may cause shaft restraint
Solution Approach 1:
The knob assembly is segmented into multiple components: the knob body, knob ring, and shaft. The knob ring acts as an intermediate component that can rotate independently, reducing the rotational inertia transmitted to the user's hand while maintaining the safety function of the heavy knob mass.
Solution Approach 2:
The knob ring serves as an intermediary between the heavy knob and the shaft. It allows the heavy knob to remain stationary or move minimally while providing a lightweight rotating interface for user manipulation, thus decoupling the safety function from the manipulation function.
2Manufacturing precision
If the shaft is rigidly fixed to prevent deformation, then manufacturing precision is improved, but the knob may become restrained due to assembly eccentricity
Solution Approach 1:
The connection between the knob ring and shaft is made dynamic rather than rigid. The knob ring can rotate freely on the shaft, accommodating minor misalignments and eccentricities that occur during assembly, while the shaft itself remains rigidly fixed for manufacturing precision.
Solution Approach 2:
The degree of freedom is changed by allowing rotational movement between the knob ring and shaft. This parameter change enables the system to tolerate assembly variations without compromising either manufacturing precision or operational ease.
3Stability of the object's composition
If the knob ring is firmly attached to the panel, then stability is improved, but the knob ring may restrain the knob rotation
Solution Approach 1:
The attachment system is segmented into the knob ring and knob ring holder as separate components. The holder provides stable attachment to the panel while the ring maintains its rotational freedom, separating the stability function from the rotation function.
Solution Approach 2:
The knob ring holder acts as an intermediary that anchors the knob ring assembly to the panel without constraining the rotational movement of the ring itself. It provides stable mounting while preserving operational freedom.
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 design effectively prevents shaft restraint, allows easy manipulation of the knob, and ensures reliable operation even with heavy knobs, enhancing assembly simplicity and durability.
Implementation Method 1
a leaf spring mechanism for secure attachment and preventing rotational movement
Data Source
AI summary
A cooking appliance is disclosed. The cooking appliance includes a cabinet defining the external appearance of the cooking appliance, a cooking unit provided in the cabinet for performing cooking using a heat source, a panel having a through hole, a heat source control unit provided at the rear of the panel, the heat source control unit having a shaft extending to the front of the panel through the through hole, a knob provided at the front of the panel in a state of being connected to the shaft for rotating the shaft according to user's manipulation, a knob ring provided between the knob and the panel for receiving at least a portion of the knob, and a knob ring holder coupled to the knob ring at the rear of the panel for allowing the knob ring to move on a front surface of the panel in a radial direction of the knob ring.