Rotatable Meter Wheel With Plastic Guide Elements
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Solution Overview
Problem
Existing wheels for meters, particularly those with a combination of metal and plastic materials, experience wear issues due to differing material properties, leading to reduced service life and increased production costs, and existing solutions either require additional components or have rigid connections that exacerbate wear.
Innovation Solution
A wheel design featuring a rotatable bearing bush and wheel rim made from different plastics, connected via a continuous guide extending in the direction of rotation, with guide elements that ensure a secure, yet flexible connection, allowing for reduced wear and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal bearing bush is used with a plastic wheel rim, then the bearing bush provides good mechanical strength and wear resistance, but the differing material properties lead to wear phenomena between the bearing bush and wheel rim
Solution Approach 1:
The patent applies homogeneity by using plastic material for both the wheel rim and the bearing bush, eliminating the material interface between dissimilar materials. This ensures uniform material properties throughout the rotating assembly, preventing wear phenomena that occur at the plastic-metal interface while maintaining adequate mechanical strength through proper plastic material selection and design.
2Strength
If the bearing bush is firmly enclosed by the wheel rim during cooling, then the connection between bearing bush and wheel rim is strong, but the rigid connection exacerbates wear phenomena
Solution Approach 1:
The patent applies dynamics by transitioning from a rigid fixed connection to a dynamically adaptable connection. The plastic bearing bush and wheel rim are allowed relative rotational movement while maintaining connection through friction and geometric interlocking. This dynamic capability allows the connection to adapt to operational conditions, reducing stress concentrations and wear while maintaining adequate connection strength.
3Strength
If additional brackets are added to increase the connecting effect, then the holding force of the bearing bush within the wheel rim is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent applies merging by integrating the connection function directly into the basic geometry of the bearing bush and wheel rim. The connection is achieved through the friction fit and geometric interlocking of the bush within the rim cavity, eliminating the need for separate brackets or additional connecting elements. This reduces structural complexity while maintaining adequate holding force.
4Ease of manufacture
If a snap-on connection is used between two plastic parts, then the production cost is reduced, but the precise positioning of parts relative to one another is not ensured
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the bearing bush and wheel rim interface. The friction fit connection relies on precisely controlled dimensional parameters such as the bush outer diameter, rim cavity diameter, and interference fit magnitude. These parameters are optimized to provide both adequate holding force and precise rotational positioning without requiring complex snap-on mechanisms.
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 minimizes wear between the bearing bush and axle, extends the service life of the wheel, and allows for easier production with reduced material costs, while maintaining high precision and mechanical stability.
Implementation Method 1
The guide (13) has guide elements (13a, 13b) which are designed in each case with a polygonal cross-section, in particular with a triangular cross-section. The two guide elements (13a, 13b) are in each case designed with an acute angle towards one another. The bearing bush (3) and the wheel rim (2) are rotatable relative to one another in the direction of rotation via the guide (13)
Data Source
AI summary
A wheel, in particular a counting wheel for a meter, includes a bearing bush and a wheel rim. The bearing bush and the wheel rim are produced from different materials. The bearing bush and the wheel rim can move relative to one another in the rotational direction through a guide having complementarily corresponding guide elements on the bearing bush and the wheel rim extending continuously in the circumferential direction of the counting wheel.