Displacement Pump One-Piece Housing Synchromesh Gear
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Solution Overview
Problem
Rotating displacement pumps, especially screw pumps, face issues with severe wear of displacement bodies and product stress due to abrasion, which reduces service life and complicates cooling and lubrication of bearings, particularly in hygienic applications like the food and cosmetics industry, and the two-piece housing construction increases manufacturing and assembly costs.
Innovation Solution
A rotating displacement pump with a one-piece housing and a synchromesh gear arranged between the bearing points, where the pinions have a ring gear fastened on a support body, allowing for reduced overall length and improved lubrication and cooling through an oil sump, and the support bodies are fastened to the shafts with a non-positive connection enabling rotational alignment of displacement bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the synchromesh gear is arranged outside the bearing points, then the shafts can be supported by bearings, but the overall length of the pump increases
Solution Approach 1:
The synchromesh gear is repositioned from the conventional location outside the bearing points to the space between the bearing points along the axial dimension. This dimensional repositioning allows the gear to utilize the existing space between bearings, eliminating the need for additional length while maintaining all functional requirements.
2Reliability
If the pinions have a large diameter larger than the center distance of the shafts, then the gear meshing is improved, but the pinions cannot be inserted through the bearing bores into the housing from either side
Solution Approach 1:
The housing is divided into two separate parts: a first housing part containing the bearing bores for radial bearings, and a second housing part containing the bearing bores for thrust bearings. This segmentation allows the large-diameter pinions to be assembled by inserting shafts through the first housing part while the pinions remain accessible from the second housing part, enabling proper gear meshing without assembly conflicts.
3Ease of operation
If a two-piece housing construction is used to accommodate the synchromesh gear between bearing points, then the gear can be positioned, but the manufacturing and assembly costs increase due to low permissible positional tolerances
Solution Approach 1:
The housing is designed as a single integrated piece rather than two separate parts. The synchromesh gear is positioned between the bearing points within this unified housing structure, eliminating the need for precision mating surfaces between multiple housing parts. This merging approach maintains proper gear positioning while significantly reducing manufacturing and assembly costs by eliminating complex tolerance requirements.
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 simplifies manufacturing and assembly, reduces the overall length of the pump, and ensures effective lubrication and cooling of bearings, enhancing the pump's durability and performance while maintaining non-contact operation to prevent wear.
Implementation Method 1
The synchromesh gear can also contribute to sufficient lubrication and cooling of the bearings, in that the pinions of the synchromesh gear are immersed in an oil sump and discharge the oil in the direction of the bearings as oil mist.
Implementation Method 2
The pinions of the synchromesh gear are immersed in an oil sump and discharge the oil in the direction of the bearings as oil mist
Data Source
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AI summary
A rotating externally mounted positive displacement pump with at least two displacement bodies (7, 8) driven synchronously to each other, which are mounted at their ends on associated shafts (9, 10), wherein the shafts (9, 10) are each supported by a first radially acting bearing (13, 14) and a second radially and axially acting bearing (15, 16), and wherein the shafts (9, 10) are coupled to each other by a synchronous gear (17), is further developed in that the bearings are fitted into receiving bores of a one-piece manufactured housing and that the synchronous gear is arranged between the respective bearings.