Rotary Shaft Brush Holder Structure for Stable Conductive Assembly
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Solution Overview
Problem
Existing brush units fail to provide a simple configuration for improving assemblability while ensuring conductivity between a rotary shaft and a conductor, leading to potential electronic corrosion in bearings due to current flow.
Innovation Solution
A brush unit with a holder, brush, and biasing part that includes a projecting part to secure conductivity and prevent the brush from jumping out, allowing easy assembly by directly connecting the holder to the conductor and the shaft conductive part of the rotary shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush unit is brought to abut on an end portion of a rotary shaft to cause a flow of an electric charge charged on the rotary shaft to a conductor such as a housing via the brush unit, then electronic corrosion in the bearing can be prevented, but the configuration becomes complex and assemblability to the conductor is poor
Solution Approach 1:
The holder is designed to perform multiple functions simultaneously: it holds the brush, provides electrical connection to the conductor, and includes a retaining structure to prevent brush dislodgement. This merging of functions into a single integrated component reduces the overall number of parts and simplifies the configuration while maintaining reliability.
Solution Approach 2:
The holder serves as a multi-functional component that combines mechanical support, electrical conduction, and retention features. By making the holder universal in its functions, the design eliminates the need for separate components for each function, thereby reducing complexity while ensuring reliable electrical connection and brush retention.
2Reliability
If a brush unit is brought to abut on an end portion of a rotary shaft to cause a flow of an electric charge charged on the rotary shaft to a conductor such as a housing via the brush unit, then electronic corrosion in the bearing can be prevented, but assemblability to the conductor deteriorates
Solution Approach 1:
The holder integrates the retention structure directly into the component that attaches to the conductor. This merging means the brush, holder, and retention mechanism can be assembled as a single unit or in fewer steps, significantly improving assemblability while maintaining the electrical connection function for corrosion prevention.
Solution Approach 2:
The holder is pre-configured with the retaining structure and brush positioning features during manufacturing. This preliminary preparation of the holder allows for quick and easy assembly to the conductor without requiring complex alignment or additional retention components, thereby improving ease of manufacture and installation.
3Reliability
If the brush is made conductive and connected to the conductor via a holder, then electrical connection is achieved, but the brush may jump out from the holder opening part causing connection failure
Solution Approach 1:
The retention structure is integrated directly into the holder body as an inherent feature rather than a separate component. This merging of retention and support functions into a single structure prevents brush dislodgement while avoiding the complexity of additional separate retention mechanisms.
Solution Approach 2:
The holder includes an asymmetric retaining structure with a projecting part that creates a one-way mechanical constraint. This asymmetric design allows the brush to be easily inserted while preventing it from jumping out, providing reliable electrical connection stability without requiring complex symmetric retention 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 brush unit enhances assemblability and conductivity with a simple configuration, preventing electronic corrosion by ensuring a stable electrical connection between the rotary shaft and the conductor.
Implementation Method 1
a biasing part having conductivity, arranged between a bottom in the holder and the brush, and biasing the brush toward a side of the opening part
Implementation Method 2
a brush accommodated in the holder, abutting on the shaft conductive part via the opening part, and having conductivity
Data Source
AI summary
A brush unit is attached to a conductor, and abuts on a shaft conductive part provided on a rotary shaft to electrically connect the conductor and the shaft conductive part. The brush unit includes a concave-shaped holder, a brush abutting on the shaft conductive part via an opening part of the holder, and a biasing part that biases the brush. The brush has a first brush part and a second brush part having a larger outer shape than the first brush part. A projecting part of the holder is opposed to a surface of the second brush part to which the first brush part is connected in a biasing direction of the biasing part.