Pump Drive Shaft Radial Support via Common Inner Race
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Solution Overview
Problem
Existing liquid pressure generating apparatuses face challenges in securing the supporting accuracy of the pump drive shaft while restraining the upsizing of the apparatus, with inadequate descriptions in prior art on how to achieve this.
Innovation Solution
A configuration featuring a pump case with a projecting portion radially supporting the pump drive shaft, integrated inner races forming a common inner race, and independently formed outer races driven by different pump members, which reduces the axial space required and enhances radial support, thereby improving the supporting accuracy and reducing the risk of capsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two one-way clutches are arranged coaxially with the pump drive shaft and both inner races are coupled to the pump drive shaft, then the pump can be driven by either power source independently, but the supporting accuracy of the pump drive shaft deteriorates and the apparatus size increases
Solution Approach 1:
The patent divides the support function into two separate support portions instead of relying on a single support point. The first support portion supports the pump drive shaft at a first position, and the second support portion supports it at a second position different from the first position. This segmentation of the support function allows the pump drive shaft to be supported at multiple locations, improving supporting accuracy while maintaining the capability to be driven by either power source independently.
2Adaptability or versatility
If two one-way clutches are arranged coaxially with the pump drive shaft and both inner races are coupled to the pump drive shaft, then the pump can be driven by either power source independently, but the apparatus size increases
Solution Approach 1:
The patent transitions from a single-axial-line arrangement to a multi-dimensional support structure. While the one-way clutches remain arranged coaxially along the axial direction, the support portions are positioned at different positions that may include radial and axial offsets. This dimensional change allows the support function to be distributed in multiple spatial dimensions, improving support accuracy without necessarily increasing the overall apparatus size in any single dimension.
3Length of stationary object
If the pump drive shaft is supported at a single position, then the apparatus size is restrained, but the supporting accuracy deteriorates and the risk of inclination or displacement increases
Solution Approach 1:
The support function is segmented into multiple support portions positioned at different locations along the pump drive shaft. This segmentation allows the shaft to be supported at multiple points, improving supporting accuracy and reducing the risk of inclination or displacement, while the overall apparatus size remains restrained through efficient spatial arrangement.
4Ease of manufacture
If the axial offset between the supporting point and load points is large, then the apparatus can accommodate the components, but the pump drive shaft experiences increased inclination or displacement reducing durability
Solution Approach 1:
The patent optimizes the local quality of the support structure by positioning support portions at specific locations that minimize the axial offset between supporting points and load points. This local optimization ensures that the pump drive shaft experiences reduced inclination or displacement, improving durability, while still accommodating all necessary components through careful spatial arrangement.
Data Source
AI summary
A liquid pressure generating apparatus including a pump, and two one-way clutches arranged coaxially with the pump drive shaft in a line in the axial direction on the side of a first axial direction. The pump case includes a projecting portion projecting from the corresponding pump case. Inner races of the respective two one-way clutches are integrated with each other and form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other, and directions of restricted relative rotation with respect to the common inner race are identical to each other. The common inner race includes a coupling portion to be coupled to the pump driving shaft on the side of the first axial direction with respect to the projecting portion.