Swashplate Pump Drive Shaft Stator Mounting
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Solution Overview
Problem
Existing wobble pumps face challenges in reducing overall length and minimizing friction losses, leading to inefficiencies in fluid delivery and increased heat buildup due to radial forces and friction.
Innovation Solution
The wobble pump design features a sloping end face for the pump shaft, a two-part drive shaft with separate bearings, and a spring mechanism to reduce tilting and friction, allowing for a more efficient fluid delivery system with reduced heat generation and improved sealing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the pump shaft is supported in the middle with a single bearing, then the structure is simpler, but the overall length cannot be shortened and friction losses increase
Solution Approach 1:
The drive shaft is divided into two separate bearings positioned at opposite ends of the pump rotor, segmenting the support function. This allows the drive shaft to be supported at its ends rather than in the middle, reducing tilting and enabling a more compact overall length while distributing mechanical loads more effectively.
Solution Approach 2:
The bearing arrangement transitions from a single central support point to two distributed support points at the ends of the drive shaft. This dimensional redistribution of support locations reduces the tilting moment and allows for a shorter overall pump length while maintaining structural integrity.
2Stability of the object's composition
If the pump shaft diameter is increased to reduce tilting, then tilting is reduced, but friction losses and heat buildup increase
Solution Approach 1:
The support function is segmented into two separate bearings at opposite ends of the drive shaft, distributing the radial forces and reducing the tilting moment. This allows the use of a smaller pump shaft diameter while maintaining stability, thereby reducing friction losses and heat buildup in the sealing area.
Solution Approach 2:
The support points are relocated from a central position to the ends of the drive shaft, changing the dimensional distribution of support forces. This reduces the tilting moment arm and allows for a smaller shaft diameter with acceptable stability, reducing friction and energy losses.
3Reliability
If a metal sleeve is used in the housing for the pump shaft, then particle penetration resistance is improved, but friction losses increase
Solution Approach 1:
The pump shaft is extracted from direct contact with the housing by introducing a non-contact arrangement. The drive shaft is supported by bearings mounted in the housing, allowing the pump shaft to rotate without contacting the housing, thus eliminating friction losses while maintaining particle penetration resistance through the bearing-supported structure.
Solution Approach 2:
The bearing acts as an intermediary between the drive shaft and the housing, providing support and radial force absorption without direct metal-to-metal contact between the pump shaft and housing. This intermediary arrangement reduces friction losses while maintaining structural integrity and particle resistance.
4Reliability
If the plain bearing length is increased to improve sealing, then sealing is improved, but friction losses and heat buildup increase
Solution Approach 1:
The sealing function is extracted from the bearing by using a non-contact arrangement where the pump shaft does not contact the housing. The bearing supports the drive shaft and handles radial forces, while sealing is achieved through the non-contact geometry, eliminating the need for long plain bearings and reducing friction losses and heat buildup.
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 results in a shorter overall length, reduced friction losses, and enhanced resistance to particle penetration, improving the efficiency and reliability of the wobble pump in fluid delivery applications.
Implementation Method 1
a spring (51) for urging the drive shaft (34) towards the pump stator (28)
Implementation Method 2
a sloping end face (46) for the pump shaft (44), which is driven by a drive shaft (34) by means of a sloping end face in such a way that it wobbles with its rotor axis about a drive axis
Implementation Method 3
pump chambers, which are formed between the pump stator and the pump rotor by gearing, are enlarged and reduced in such a way that a fluid is conveyed through the wobble pump
Data Source
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AI summary
The invention relates to a swashplate pump (10) comprising a pump stator (28) secured to a housing (12) of the swashplate pump and a pump rotor (48) guided in the pump stator (28), said pump rotor being driven by a drive shaft (34) by means of an oblique end face (46) such that its rotor axis wobbles about a drive axis of the drive shaft (34). The drive shaft (34) penetrates the pump rotor (48) through a passage (49) and is mounted in a bearing of the pump stator (28).