Electric Cylinder Rotation Support Structure With Assembly Error Gaps
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Solution Overview
Problem
Existing rotation support structures for electric cylinders face issues with assembly accuracy, size constraints due to hollow sleeve structures, and potential interference between components, leading to unnecessary resistance and increased size.
Innovation Solution
A rotation support structure with a cylindrical housing, a motor, and a speed reduction mechanism that includes a gear unit with a first gear and a shaft support portion, featuring gaps between components to accommodate assembly errors and prevent interference, allowing for a compact and reliable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer ring of the bearing serves as a wall portion of the housing with high assembly accuracy, then the rotating shaft extending direction is accurately defined and parallel to the housing, but the processing accuracy requirement increases and assembly complexity increases
Solution Approach 1:
The housing is divided into a stationary housing body and a separate rotating shaft support structure. The bearing outer ring is detached from the housing wall, allowing independent positioning and assembly of the shaft support portion relative to the housing, thereby reducing assembly complexity while maintaining accuracy
Solution Approach 2:
A shaft support portion is introduced as an intermediary component between the bearing and the housing. This intermediate structure simplifies the assembly process by providing a dedicated mounting interface for the bearing, separating the positioning function from the housing structure itself
2Volume of moving object
If the sleeve has a hollow structure to reduce size, then the component size decreases, but the position for attaching the rotation shaft is limited and member size increases
Solution Approach 1:
The shaft support portion extends in the axial direction (another dimension) rather than requiring radial space. By utilizing the axial dimension for shaft attachment, the design overcomes the radial space constraints imposed by the hollow sleeve structure, maintaining compactness while providing adequate shaft support
3Device complexity
If the bearing outer ring is integrated with the housing wall, then the structure is simplified, but unnecessary resistance is generated in piston reciprocating movement
Solution Approach 1:
The shaft support function is segmented from the housing wall structure. The bearing is mounted on a separate shaft support portion that can be independently positioned, preventing the housing wall from directly constraining the piston's reciprocating motion and thereby reducing unnecessary resistance
Solution Approach 2:
The shaft support function is extracted from the housing wall and placed in a separate shaft support portion. This extraction allows the housing wall to focus solely on containing the mechanism while the dedicated shaft support handles rotational support, eliminating the source of unnecessary resistance
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 solution enables stable operation and reduced component count by accommodating assembly errors and preventing interference, resulting in a compact and reliable rotation support structure for electric cylinders.
Implementation Method 1
a ball (1) interposed between the outer member (4) and the shaft support portion (2)
Data Source
AI summary
A rotation support structure for an electric cylinder includes a motor attached to a housing and including an output shaft; and a speed reduction mechanism connected to the output shaft. The speed reduction mechanism includes a gear unit including a first gear and a shaft support portion and has an outer member facing an inner surface of the housing and a ball, and an annular second gear fixed to the housing and meshing with the first gear, one side end portion of the outer member faces the inner surface of the housing or a spacer attached to the housing, and the other side end portion faces the second gear. A gap is formed between the outer member and the second gear, and between the outer member and at least either the housing or the spacer. A gap is formed between the outer member and the inner surface of the housing.