Retractable Crankshaft Simulation for Eccentric Trajectory Detection
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Solution Overview
Problem
The challenge is to design a retractable crankshaft simulation device that can be easily inserted into a moving component and switched to a working mode to facilitate the manual detection of the eccentric movement trajectory, as existing crankshafts face difficulties in being extended or positioned due to limited space in tooling.
Innovation Solution
A crankshaft simulation device comprising a cylindrical fixed shaft, a wedge-shaped rod, a support rod, and a movable shaft with a spring mechanism, allowing the device to transition between a straight shaft and a crankshaft form for eccentric movement, enabling easy insertion and removal within tooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional crankshaft is used for manual detection, then the moving component can be powered, but it cannot be inserted into the moving component when the assembly of the tooling and the moving component is finished due to limited space
Solution Approach 1:
The crankshaft is designed with a movable shaft that can dynamically change its configuration between a retracted straight shaft state for insertion and an extended crankshaft state for operation. The movable shaft can shift radially relative to the fixed shaft, transforming the overall shape from a simple cylindrical form to a crankshaft form with eccentric movement capability.
Solution Approach 2:
The movable shaft is nested within or alongside the fixed shaft, with the movable shaft capable of radial shifting while remaining associated with the fixed shaft structure. This nested arrangement allows the crankshaft components to be compact during insertion and expand into the functional crankshaft configuration during operation.
2Power
If the crankshaft is extended into the moving component to transmit power, then the moving component can be driven, but it is difficult to extend due to limited space in the tooling
Solution Approach 1:
The crankshaft transitions from a static extended form to a dynamic configuration where the movable shaft can shift radially. This allows the power transmission function to be achieved in a compact manner during insertion, then transformed into the extended crankshaft configuration for power transmission after insertion is complete.
Solution Approach 2:
The crankshaft is inserted in a retracted straight shaft configuration before the moving component is fully assembled or positioned. Once inserted, the movable shaft shifts radially to form the crankshaft configuration, establishing the power transmission capability in advance for subsequent operation.
3Ease of operation
If a retractable crankshaft design is implemented, then easy insertion and removal is achieved, but the device complexity increases
Solution Approach 1:
The retractable functionality is achieved through a dynamic mechanism where the movable shaft can shift radially relative to the fixed shaft. This single degree of freedom movement allows the crankshaft to transform between retracted and extended states without requiring complex multi-stage mechanisms.
Solution Approach 2:
The crankshaft is segmented into a fixed shaft and a movable shaft that can shift radially. This segmentation allows independent functionality of each component while enabling the overall retractable transformation through the relative movement between the two segments.
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
The device allows for effective insertion and removal within tooling, enabling easy detection of eccentric movement trajectories with a simple structure and practical application in engineering contexts.
Implementation Method 1
a spring, one end of which abutting on the support rod and the other end of which abutting on the inner wall of the flat through hole of the movable shaft, so as to push the movable shaft outwards in the radial direction of the movable shaft
Implementation Method 2
a wedge-shaped rod inserted into the through hole, which is movable in the axial direction of the fixed shaft under an external force, and the first end of the wedge-shaped rod is extendable from the first axial end of the fixed shaft... the first end of the wedge-shaped rod is provided with an inclined surface so that the first end of the wedge-shaped rod is wedge-shaped
Data Source
AI summary
A crankshaft simulation device includes: a fixed shaft in which a through hole extending in the axial direction of the fixed shaft is provided; a wedge-shaped rod which is movable in the through hole under an external force, and the first end of the wedge-shaped rod is extendable from the first axial end of the fixed shaft, the second end of the wedge-shaped rod is extendable from the second axial end of the fixed shaft, and the first end of the wedge-shaped rod is provided with an inclined surface so that the first end of the wedge-shaped rod is wedge-shaped; a support rod extending from the first axial end of the fixed shaft in the axial direction of the fixed shaft; a movable shaft in which a flat through hole is provided, and the support rod is inserted into the flat through hole, and the size of the flat through hole in the radial direction of the movable shaft is configured to allow the movable shaft to be shifted in the radial direction of the movable shaft, and the flat through hole is configured to allow the first end of the wedge-shaped rod to be inserted into the flat through hole before the movable shaft is shifted in the radial direction of the movable shaft; and a spring pushing the movable shaft outwards in the radial direction of the movable shaft.