High-Pressure Pump Roller Skate Spring Integration
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Solution Overview
Problem
Existing high-pressure pumps for fuel injection systems in internal combustion engines require a strong restoring spring that occupies significant space, limiting design flexibility and efficiency.
Innovation Solution
The design incorporates a roller skate with a groove-shaped recess for a band-shaped spring element that prevents twisting and ensures coaxial alignment, eliminating the need for a separate return spring, allowing for a more compact and efficient pump configuration with annular spring elements providing preload to the pistons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strong restoring spring is used to ensure pump piston engagement, then reliability is improved, but the spring occupies significant space limiting design freedom
Solution Approach 1:
The invention merges the restoring spring function with the roller skate component by integrating a groove-shaped recess directly into the roller skate. The band-shaped spring element is inserted into this recess, combining two previously separate functions (restoring force and roller support) into a single integrated component, thereby eliminating the need for separate restoring springs in the pump assemblies.
Solution Approach 2:
The roller skate is designed with multi-functionality: it provides roller support for the cam drive shaft, serves as a mounting structure for the spring element through its groove-shaped recess, and prevents twisting of the spring element. This universal component performs multiple functions that previously required separate parts, optimizing space utilization.
2Reliability
If a band-shaped spring element is inserted into a groove-shaped recess of the roller skate, then the roller skate is prevented from twisting and coaxial alignment is improved, but device complexity increases
Solution Approach 1:
The roller skate is segmented into functional zones: the main body structure, the groove-shaped recess for spring element insertion, and the roller mounting area. This segmentation allows the groove-shaped recess to be integrated without requiring a completely new roller skate design, merely adding a specific geometric feature to an existing component structure.
Solution Approach 2:
Instead of adding external constraints or separate alignment mechanisms to prevent roller skate twisting, the invention inverts the approach by designing the groove-shaped recess itself to provide the anti-twisting function. The recess geometry inherently prevents rotation, eliminating the need for additional alignment devices.
3Volume of stationary object
If separate return springs are omitted from pump assemblies, then design freedom and compactness are improved, but ensuring reliable piston reset at high engine speeds becomes more difficult
Solution Approach 1:
The invention merges the return spring function with the roller skate structure. The band-shaped spring element inserted into the groove-shaped recess of the roller skate provides the necessary restoring force for piston reset, eliminating the need for separate return springs while maintaining functionality even at high engine speeds.
Solution Approach 2:
The annular spring element and groove-shaped recess utilize curved geometries that provide uniform force distribution and stable elastic deformation characteristics. This curved design ensures reliable piston reset forces are maintained across varying engine speeds, replacing traditional linear spring configurations.
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 configuration enables higher pressure capabilities, increased efficiency, and reliability by reducing elastic deformations and allowing for a more favorable design, ensuring reliable operation even at high engine speeds.
Implementation Method 1
The roller skate has a groove-shaped recess in which a spring element is at least partially arranged. The spring element has a band-shaped section and the band-shaped section of the spring element is inserted into the groove-shaped recess of the roller skate.
Implementation Method 2
The roller skate has a groove-shaped recess in which a spring element is at least partially arranged, wherein the spring element has a band-shaped section and the band-shaped section of the spring element is inserted into the groove-shaped recess of the roller skate.
Data Source
Figure 1
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AI summary
A high-pressure pump (1) is used especially as a fuel pump for fuel injection systems in air-compressing, self-igniting internal combustion engines. Said high-pressure pump (1) comprises a first pump subassembly (17), a second pump subassembly (18), and a drive shaft (3). The first pump subassembly (17) is located at least approximately across from the second pump subassembly (18) in relation to the drive shaft (3). At least one cam (9) for driving both the first pump subassembly (17) and the second pump subassembly (18) is provided on the drive shaft (3). Furthermore, spring elements (40, 41) are provided which are connected to a piston (23) of the first pump subassembly (17) by means of a retaining brace (45) and are connected to a piston (23) of the second pump subassembly (18). The spring elements (40, 41) are mounted in a biased manner such that the two pistons (23, 23) return without separate return springs or retracting springs during operation of the high-pressure pump (1).