Pump Thrust Bearing Structure Without Fixed-Shaft D-Cut
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Solution Overview
Problem
Conventional pump devices with D-cut processing on fixed shafts are costly and prone to improper assembly, requiring additional components to prevent thrust bearing corotation, which complicates the design and increases expenses.
Innovation Solution
The pump device employs a thrust bearing with protrusions and a connection portion that prevents rotation without D-cut processing on the fixed shaft, reducing costs and simplifying the configuration by integrating rotation prevention within the case body, allowing for a simpler elongated cylindrical fixed shaft design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D-cut processing is performed on both ends of the fixed shaft to prevent thrust bearing rotation, then the thrust bearing is prevented from corotating with the rotor, but the manufacturing cost of the fixed shaft increases
Solution Approach 1:
The invention extracts the rotation prevention function from the fixed shaft by providing a plain surface on the inner circumference of the fixed-shaft insertion hole in the thrust bearing. This separates the rotation prevention function from the shaft itself, allowing the shaft to be manufactured without costly D-cut processing while the thrust bearing handles the rotation prevention through its plain surface design.
2Stability of the object's composition
If D-cut processing is performed on the fixed shaft to prevent thrust bearing rotation, then the thrust bearing remains stationary, but the fixed shaft design becomes more complex and expensive
Solution Approach 1:
The rotation prevention function is extracted from the fixed shaft structure and transferred to the thrust bearing's fixed-shaft insertion hole. The plain surface on the inner circumference of the insertion hole provides the necessary friction to prevent thrust bearing rotation without requiring any asymmetric features or complex processing on the fixed shaft itself.
3Reliability
If additional components are added to prevent thrust bearing corotation, then rotation prevention is achieved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The invention merges the rotation prevention function into the existing thrust bearing structure by providing a plain surface on the inner circumference of the fixed-shaft insertion hole. This eliminates the need for separate rotation prevention components while maintaining the thrust bearing's primary function of supporting axial loads.
Solution Approach 2:
The thrust bearing's fixed-shaft insertion hole with its plain surface automatically provides rotation prevention through friction between the plain surface and the fixed shaft. This self-service mechanism eliminates the need for additional components or complex assembly procedures.
Data Source
AI summary
A pump device is provided. In the pump device, a bottom portion of a case body with a suction port formed therein is provided with a through-hole through which a fluid sucked through the suction port passes, and the case body is provided with a shaft holding portion holding the lower end of the fixed shaft and a plurality of connection portions disposed with a space interposed therebetween in the circumferential direction of the rotor so as to surround the through-hole and connecting the shaft holding portion and the bottom portion. The upper end side of the connection portion is provided with a protrusion protruding upward beyond the upper end surface of the shaft holding portion, and at least one of the protrusions is a rotation preventing portion that prevents rotation of the thrust bearing in the circumferential direction of the rotor.