Adjustable Eccentric Pump Rotor for Engine Mounting Flexibility
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Solution Overview
Problem
Existing motor vehicle internal combustion engine pumps face limitations in installation space flexibility and manufacturing complexity due to fixed positioning relative to the camshaft, with limited options for radial inlet or outlet orientation.
Innovation Solution
The pump rotor axis position is made adjustable relative to the camshaft axis by changing the rotational position of the pump housing, allowing for flexible adaptation to various space conditions, with fastening points arranged below the rotor axis for precise positioning and reduced manufacturing effort, and incorporating a radial outlet design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pump rotor axis is positioned at the center of the cross-sectional plane of the second pump housing area, then the pump structure is simplified and manufacturing is easier, but the installation space flexibility is severely limited
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the pump rotor axis from the center of the cross-sectional plane of the second pump housing area. This asymmetric positioning (with offset s/5 to 4s/5, particularly approximately s/3) enables the pump to adapt to different installation space situations and engine types while maintaining a relatively simple overall structure.
2Manufacturing precision
If the pump position is dependent on the camshaft position for precise positioning, then the positioning precision is improved, but the installation space flexibility is reduced
Solution Approach 1:
The patent resolves this contradiction by introducing fastening points arranged essentially below the axis of the pump rotor, adding a vertical dimension to positioning. This allows precise positioning through fastening points while maintaining flexibility in horizontal installation positions, enabling adaptation to different engine types and space conditions.
3Manufacturing precision
If the pump housing is designed with precise entry geometry to position the pump, then the positioning precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the positioning function into two independent parts: (1) the fastening points arranged essentially below the rotor axis for precise vertical positioning, and (2) the entry geometry of the pump housing into the engine housing for horizontal alignment. This segmentation allows each part to be simpler while achieving overall precise positioning.
4Ease of manufacture
If the pump is designed with fixed inlet/outlet orientation, then the manufacturing effort is reduced, but the adaptability to different engine types is limited
Solution Approach 1:
The patent applies dynamics by making the pump housing rotatable about the pump rotor axis. This allows the radial inlet or outlet orientation to be adjusted dynamically to suit different engine types and space conditions, while the pump itself maintains a relatively simple fixed internal structure, balancing manufacturing ease with adaptability.
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
The invention relates to a pump for a motor vehicle internal combustion engine, comprising a rotor that can be connected to a camshaft of the internal combustion engine and a pump housing that can be connected to a housing of the internal combustion engine, having a first pump housing area and a second pump housing area, wherein the second pump housing area is provided for inlet through an opening area of the internal combustion engine housing into the internal combustion engine housing, and the axis of the pump rotor is disposed eccentric to the cross-sectional plane of the second pump housing area, and a motor vehicle internal combustion engine having such a pump.