Coffee Machine Brewing Spindle Bearing for Quiet Rotation
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Solution Overview
Problem
Existing brewing devices for coffee machines experience noise issues due to play between the spindle's bearing journal and bearing rings, caused by manufacturing tolerances, leading to disturbing sounds and imbalances during spindle rotation.
Innovation Solution
Incorporating a support element, such as a sliding body with a compression spring, into the bearing ring to press the bearing journal against the ring, eliminating play and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If injection molding process is used to manufacture bearing components, then manufacturing cost is reduced and production efficiency is improved, but manufacturing precision deteriorates due to inability to maintain exact tolerances
Solution Approach 1:
The bearing system is segmented into multiple components: the bearing ring (injection molded), the support element (separate component), and the spring element (separate component). This segmentation allows the bearing ring to be manufactured using cost-effective injection molding while the support element and spring element are added separately to achieve the required precision and eliminate play, thus resolving the contradiction between manufacturing ease and precision.
2Ease of manufacture
If larger tolerance is used in bearing dimensions, then manufacturing cost is reduced, but noise increases due to play between bearing journal and bearing rings
Solution Approach 1:
The support element acts as an intermediary component between the bearing journal and the bearing ring. It is pressed against the bearing journal by the spring element, thereby eliminating the play that would otherwise cause noise. This intermediary component allows the use of larger tolerances in the bearing ring manufacturing while still achieving quiet operation.
3Ease of manufacture
If larger tolerance is used in bearing dimensions, then manufacturing cost is reduced, but imbalance occurs causing rumbling noise during spindle rotation
Solution Approach 1:
The invention changes the operational parameters of the bearing system by introducing a spring element that applies radial force to press the support element against the bearing journal. This parameter change (applying radial pressure) compensates for dimensional variations and tolerances in the bearing components, eliminating imbalance and rumbling noise while allowing larger manufacturing tolerances.
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 solution effectively eliminates noise and imbalance by ensuring a bearing with minimal play, resulting in a quieter operation of the spindle.
Implementation Method 1
at least one support element (28) is inserted in at least one of the bearing rings (26, 27), which can be pressed essentially radially against the bearing journal (25) by means of a spring element (37, 38)
Implementation Method 2
The support element is advantageously designed as a sliding body with a sliding surface which is inserted into a recess in the bearing ring and the sliding surface of which can be pressed onto the lateral surface of the bearing journal
Data Source
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AI summary
The device has a brewing cylinder (6) and pistons (3, 4) movably held in a frame (2) relative to each other. A coffee powder feeding device is provided for filling a brewing chamber (12) with coffee powder. A stripping unit leads away a coffee-powder cake into a collection container, where the cake is produced from the brewing chamber through the piston (4) after the brewing process. A supporting element (28) is inserted into one of bearing rings (26, 27). The supporting element is radially pressable against a bearing pin (25) by a spring element.