Fuel Injection Roller Wear Reduction via Curved Bracing
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Solution Overview
Problem
High-pressure pumps for fuel injection systems experience wear and increased friction between the roller and adjacent components due to forces acting along the rotational axis, leading to slip and further wear, which hinders the rotary motion of the roller.
Innovation Solution
The design incorporates a bracing means with a convex curvature and materials or coatings with high wear resistance to minimize tribological stress, and a support element with a roller that is optimized for minimal pressure per unit surface area, ensuring reduced wear and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a roller is used to reduce friction between the pump piston and cam, then the rotary motion is improved, but wear occurs on the roller and adjacent components due to forces acting along the rotational axis
Solution Approach 1:
A bracing means is introduced as an intermediary component between the roller and the support element. This bracing means absorbs the forces acting along the rotational axis of the roller, preventing these forces from acting directly on the roller. The bracing means includes a bracing surface that is engaged by the roller, providing structural support while allowing the roller to maintain its low-friction rotary motion capability.
Solution Approach 2:
The bracing means is designed with specific geometric parameters including a bracing surface with optimized curvature radius and orientation angle. The curvature radius of the bracing surface is selected to be between 0.5mm and 5mm, and the orientation angle between the bracing surface normal and the roller rotational axis is between 10° and 30°. These parameter optimizations minimize tribological stress on the roller while effectively bearing axial forces.
2Stability of the object's composition
If the roller is constrained to prevent axial movement, then the roller position is stabilized, but friction increases due to wear between the roller and bracing means
Solution Approach 1:
The bracing surface is designed with optimized geometric parameters including curvature radius (0.5mm-5mm) and orientation angle (10°-30° relative to the roller rotational axis). These parameter changes create an optimal balance between constraining the roller axially and minimizing contact friction. The curved bracing surface allows smooth roller movement while maintaining positional stability.
Solution Approach 2:
The bracing surface is designed with a curved geometry rather than a flat surface. This curvature allows the roller to maintain stable contact while reducing stress concentration and friction. The spherical or cylindrical curvature of the bracing surface complements the roller geometry, enabling smooth relative motion while preventing axial displacement of the roller.
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 solution effectively reduces wear on the roller and bracing means, minimizing friction and maintaining smooth rotary motion, thereby preventing slip and extending the lifespan of the components.
Implementation Method 1
a roller that rolls on the cam or eccentric element of the drive shaft is rotatably supported in the support element
Implementation Method 2
coatings or inserts with high wear resistance, to reduce wear and friction between the roller and adjacent components
Implementation Method 3
optimized geometry and materials for minimal tribological stress
Data Source
AI summary
The high pressure pump includes a drive shaft with at least one cam or eccentric and at least one pump element with a pump piston driven in the reciprocating direction by the cam or eccentric on the driveshaft in a reciprocating motion. A support element is arranged between the pump piston and the cam or eccentric on the driveshaft and also a roller running on the cam or eccentric is mounted to rotate therein. A support for the roller in the direction of rotation is arranged adjacent to the same in the direction of the rotational axis of the roller. The roller and/or the support include a surface with high wear resistance at least in the contact region between the roller and the support.