Multi-part Crankcase Assembly with Threaded Sleeves
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Solution Overview
Problem
Multi-part crankcases require significant assembly effort due to the need for screwing together components made from different materials, increasing production time and complexity.
Innovation Solution
A method involving a cylinder block with threaded holes and a bearing tunnel upper part with coaxial through-holes and internal threads, along with threaded sleeves having different thread directions and driver profiles, allows for simultaneous screwing of the components together using a screwdriver tool, reducing assembly complexity and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multi-part crankcases are assembled by screwing together components made from different materials, then structural integrity and material optimization are improved, but assembly effort and production complexity increase
Solution Approach 1:
The patent combines multiple fastening operations into a single integrated process. The threaded sleeve with opposing threads allows simultaneous engagement with both the stud screw and the through-hole, merging two separate screwing operations (one for the stud screw, one for the through-hole) into a single assembly action. This reduces assembly complexity while maintaining the multi-material construction benefits.
Solution Approach 2:
The threaded sleeve acts as an intermediary component that mediates between the stud screw and the through-hole. It has opposing threads on its two ends, allowing it to engage with both elements simultaneously. This intermediary component simplifies the assembly process by providing a single fastening element that accomplishes what would otherwise require multiple separate fastening operations.
2Reliability
If multiple components are screwed together using conventional methods, then reliable connections are achieved, but assembly time and production efficiency decrease
Solution Approach 1:
The invention merges multiple fastening operations into a single integrated fastening element. The threaded sleeve simultaneously engages with both the stud screw and the through-hole, allowing both connections to be established in one assembly action. This maintains reliable connections while significantly improving assembly efficiency and reducing production time.
Solution Approach 2:
The threaded sleeve is designed with pre-configured opposing threads that are ready to engage with both the stud screw and the through-hole simultaneously. This preliminary configuration of the fastening element enables the simultaneous establishment of both connections, eliminating the need for sequential fastening operations and thereby improving productivity.
3Adaptability or versatility
If threaded connections are made from different directions, then compatibility with different components is improved, but assembly difficulty and tool access requirements increase
Solution Approach 1:
The threaded sleeve serves as an intermediary that bridges the need for different thread directions. By having opposing threads on its two ends, it can engage with components that require different threading directions simultaneously. This eliminates the need for separate fastening operations for each direction, thereby simplifying the assembly process and improving ease of operation while maintaining versatility.
Solution Approach 2:
The invention combines the functionality of multiple fastening elements with different thread directions into a single threaded sleeve. This integrated approach allows the sleeve to engage with both the stud screw and the through-hole in one operation, reducing assembly difficulty while maintaining compatibility with different component configurations.
Data Source
AI summary
Described is a crankcase and a method for assembling a multi-part crankcase. The method can include providing a cylinder block and a bearing tunnel upper part. The cylinder block has a plurality of threaded holes into each of which a stud screw is screwed, where the stud screws protrude from the cylinder block. The bearing tunnel upper part has a plurality of through-holes, where each of the through-holes is arranged coaxially to a corresponding stud screw. On a side facing the cylinder head, each of the through-holes has an internal thread having a first direction of rotation. A plurality of threaded sleeves, each threaded sleeve has an internal thread that has a second direction of rotation, an external thread that has a first direction of rotation, and a driver profile for inserting a screwdriver tool in a positive-locking manner, are provided.