Vacuum Pump Stepped-Bore Mounting for Crash Load Transmission
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Solution Overview
Problem
Small vacuum pumps with multi-part housings face space constraints for threaded openings, making it difficult to securely attach them to a fastening structure and reliably transmit crash moments.
Innovation Solution
The vacuum pump design incorporates stepped bores in the first housing part with an internal thread in the larger bore section to accommodate fastening screws, allowing for secure attachment to a fastening structure without additional threaded openings, using existing bores for both screw reception and fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of mounting screws and/or their diameter is reduced to accommodate space constraints, then the space requirement for threaded openings is reduced, but the reliability of transmitting crash moments to the fastening structure deteriorates
Solution Approach 1:
The stepped bores serve dual functions: they accommodate the mounting screws that attach the first housing part to the second housing part, and simultaneously provide threaded openings for receiving fastening screws that secure the vacuum pump to a fastening structure. This multi-functionality eliminates the need for separate threaded openings, resolving the space constraint while maintaining sufficient fastening capability for crash moment transmission.
2Reliability
If threaded openings are provided for receiving fastening screws, then the vacuum pump can be securely attached to a fastening structure, but the space available on the underside of the housing is reduced
Solution Approach 1:
The stepped bores are designed to fulfill multiple purposes: they provide the structural connection between housing parts via mounting screws, and simultaneously create the necessary threaded openings for fastening screws. This eliminates the need for additional separate openings, thereby preserving space on the underside of the housing while ensuring secure attachment capability.
Solution Approach 2:
The invention merges the function of mounting screw accommodation with the function of fastening screw reception into a single structural feature (the stepped bores). By combining these two functions that were previously requiring separate features, the design optimizes space utilization on the housing underside while maintaining both structural integrity and secure fastening capability.
Data Source
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AI summary
The present invention relates to a vacuum pump with a housing for receiving at least one pumping mechanism rotatable about an axis of rotation. The housing comprises a first housing part and a second housing part, wherein at least one stepped bore extends through the first housing part, having a first bore section, a second bore section with a smaller diameter than the first bore section, and an annular shoulder between the two bore sections. The stepped bore receives a screw with a screw head and a screw shank, the screw shank of which extends through the second bore section and is partially screwed into a threaded bore of the second housing part, and the screw head of which is supported on the annular shoulder. The first bore section contains an internal thread for screwing in a threaded shank for attaching the first housing part to a mounting structure.