Flange Sleeve Lubricant Flow Path for Diesel Injection Pump
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Solution Overview
Problem
Existing collar bushings for supporting drive shafts in diesel injection pumps face challenges in achieving efficient lubrication and mechanical stability while being cost-effective, particularly due to difficulties in forming a hydrodynamically closed lubricating film and maintaining tribologically advantageous conditions.
Innovation Solution
A collar bushing design featuring a cylindrical radial bearing part and an annular disk-shaped axial bearing part, where the axial bearing part has a continuous opening in the circumferential direction with enlarged sections for improved lubricant flow, produced using a stamping process, and a cohesive connection between the radial and axial bearing parts for enhanced mechanical stability and lubricant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the axial bearing part is made from two half parts with radial parting lines, then it is easier to manufacture and assemble, but it becomes difficult to form a hydrodynamically closed lubricating film and tribologically advantageous conditions are lost
Solution Approach 1:
The collar bushing is divided into two functional segments: a radially acting bearing portion and an axially acting bearing portion, both integrated into a single piece. This segmentation allows each portion to be optimized for its specific function while maintaining a continuous circumferential structure that enables hydrodynamically closed lubricating film formation.
Solution Approach 2:
The radial and axial bearing portions are merged into a single integrally formed collar bushing component. This merging eliminates the need for separate half-parts with radial parting lines, while the integrated design incorporates opening enlargements that provide lubricant access to both bearing surfaces simultaneously.
2Reliability
If three axial bearing parts with resilient function and gradations in overlay are provided, then lubrication is improved, but the device complexity increases
Solution Approach 1:
Instead of providing three separate axial bearing parts with gradations in overlay, the invention uses a single axial bearing portion with strategically positioned opening enlargements. These enlargements provide sufficient lubricant access to achieve the desired lubrication effect without the complexity of multiple overlapping bearing parts.
3Strength
If tongue-like projections are bent over and clipped into recesses to mechanically attach axial bearing part to radial bearing part, then mechanical stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The radial and axial bearing portions are merged into a single integrally formed component through a stamping process. This eliminates the need for separate mechanical attachment mechanisms such as tongue-like projections and recesses, while maintaining the structural integrity and mechanical stability of the collar bushing.
4Reliability
If an opening enlargement with large cross section is provided for improved lubricant flow, then lubrication and cooling are improved, but manufacturing cost increases
Solution Approach 1:
The opening enlargements are designed with specific geometric parameters optimized for both lubrication performance and manufacturability. The cross-sectional shape and dimensions are carefully selected to provide sufficient lubricant flow area while being compatible with standard stamping processes, thereby controlling manufacturing costs.
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 design ensures effective lubrication and cooling through continuous lubricant supply and discharge, maintaining a tribologically advantageous lubricating film, while being cost-effective and providing adequate mechanical stability for the drive shaft components.
Implementation Method 1
it has proven to be advantageous for the opening enlargement to have a cross section which is in the form of a rectangle with rounded corners or a segment of a circle. Such a form of widening the opening offers the advantage that the collar bushing according to the invention can be produced inexpensively by means of a stamping process.
Implementation Method 2
Cooling of the bearing point is also realized by the preferably continuous supply and discharge of lubricant through the widening of the opening.
Data Source
AI summary
The invention relates to a constructed flanged bushing (10) for supporting a drive shaft (38) in a diesel injection pump, comprising a cylindrical radial bearing part (12) and an annular thrust bearing part (14), which is integrally formed in a circumferential direction (18) and is integrally and permanently joined to the radial bearing part (12) and has a shaft passage opening (16). It is proposed that at least one radially outwardly directed opening extension (24) extending from the shaft passage opening (16) and encompassing the entire material thickness (21) of the thrust bearing part (14) is provided, which extends in a radial direction (22) beyond an outer circumference (23) of the radial bearing part (12). The flanged bushing (10) according to the invention offers advantageous sliding properties due to improved lubrication of the sliding surfaces.