Coffee Grinder Bearing Layout for Consistent Disc Spacing
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Solution Overview
Problem
Conventional grinding mechanisms experience bending loads and fluctuations in grinding disc distance due to central bearing arrangements, leading to uneven grinding and potential mechanical stress, while also facing issues with material blockages and overheating due to inefficient discharge channels.
Innovation Solution
The introduction of angular bearings positioned radially outside the grinding discs, supported by a ring-shaped angular ball bearing and a plain bearing with a spring washer, along with a sealing ring to prevent material ingress, and driver lugs for efficient material removal, ensures stable operation and consistent grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If central bearing arrangement is used to support the grinding disc holder, then the structure is simple and easy to manufacture, but bending loads cause fluctuations in grinding disc distance and uneven grinding
Solution Approach 1:
The patent transitions from a central axial bearing arrangement to a radial bearing arrangement located at the periphery of the grinding disc holder. This dimensional change in bearing placement eliminates the long lever arm that caused bending moments, allowing the grinding discs to maintain consistent spacing without requiring complex compensation mechanisms.
2Strength
If high-strength materials are used for grinding discs to withstand bending loads, then mechanical strength is improved, but manufacturing cost increases and machining difficulty increases
Solution Approach 1:
The patent applies bearings in advance at the radial periphery of the grinding disc holder to prevent bending loads from occurring during operation. By eliminating the source of bending moments through proper bearing placement, ordinary materials can be used instead of expensive high-strength materials, significantly reducing manufacturing costs and machining complexity.
3Reliability
If large volume regrind channel is designed to prevent blockages, then material flow reliability is improved, but the channel volume increases and ground material remains too long causing aroma loss and overheating
Solution Approach 1:
The patent changes the geometric parameters of the regrind channel by adding driver lugs that actively transport ground material along the channel. This allows for a smaller channel volume while maintaining reliable material flow, as the driven transport mechanism prevents blockages without requiring excessive channel capacity.
4Device complexity
If conventional central bearing arrangement is used, then device complexity is low, but grinding disc holder experiences severe bending stress leading to potential disc breaking
Solution Approach 1:
The patent introduces radial bearings as intermediary support elements at the periphery of the grinding disc holder. These bearings act as mediators that directly support the grinding disc assembly, eliminating the transmission of bending loads through the holder structure and preventing disc breaking without significantly increasing overall device 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
This design minimizes bending loads, maintains a consistent grinding degree, extends the service life of the grinder, and allows for a smaller, lighter, and potentially cheaper construction while ensuring continuous material discharge and preventing overheating.
Implementation Method 1
a spring washer (16) is provided as a plain bearing
Implementation Method 2
a felt sealing ring (12) is provided in the housing (2)
Implementation Method 3
The material to be ground, which is fed in from the middle, is crushed by the grinding discs
Implementation Method 4
conveyed outwards into a surrounding grinding channel by centrifugal force
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Grinder (1) for ground material, in particular coffee beans, with a housing (2), a grinding disk holder (4) which is rotatably mounted in the housing (2) and on which a first annular grinding disk (5) is fixed, and which is held non-rotatably in the housing (2). second annular grinding disk (6), an overhead housing opening (3) for filling in ground material, a discharge opening (19) formed on the side of the housing for ground flour, and an electric drive (9) for rotating the grinding disk holder (4). so that bending loads on the grinding disks are largely avoided and a constant degree of grinding of the material to be ground is achieved, it is proposed that an angular contact bearing (11) is arranged between the grinding disk holder (4) and a housing part (10), namely vertically or axially below the annular grinding disks ( 5.6).