Eccentric Crankshaft Flange Alignment for Even Thrust Load in Speed Reducers
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Solution Overview
Problem
Existing speed reducers with a crankshaft and planetary gear mechanism experience uneven thrust loads due to the offset axial center of the flange part with respect to the eccentric part bearing, leading to potential deformation and reduced efficiency.
Innovation Solution
The speed reducer design ensures that the center of the flange part in a direction orthogonal to the axial direction coincides with the center of the eccentric part, allowing the engagement part to abut the flange part in a concentric state, thereby distributing the thrust load evenly across the flange part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the flange part is designed with an annular shape concentric with the rotation support part, then the structure is simple and easy to manufacture, but the axial center of the flange part is offset from the axial center of the eccentric part bearing, causing uneven thrust load distribution
Solution Approach 1:
The flange part is designed with an annular shape that is concentric with the eccentric part rather than the rotation support part. This asymmetric positioning relative to the rotation support part ensures that the axial center of the flange part coincides with the axial center of the eccentric part bearing, enabling uniform thrust load distribution across the bearing surface and improving reliability.
2Reliability
If the flange part is made larger to increase the bearing area, then the thrust load is distributed more evenly, but the overall size of the crankshaft increases
Solution Approach 1:
The flange part is designed with a localized annular shape that is strategically positioned to be concentric with the eccentric part. This local geometric feature concentrates the thrust load bearing function at the optimal location, achieving even load distribution across the bearing surface without unnecessarily increasing the overall size of the crankshaft.
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
This design effectively reduces the likelihood of biased deformation loads on the flange part and crankshaft, enhancing the speed reducer's operational efficiency and durability by evenly distributing the thrust load.
Implementation Method 1
the center of the flange part in a direction orthogonal to the axial direction coincides with the center of the eccentric part in a direction orthogonal to the axial direction
Implementation Method 2
The end surface of the flange part facing the eccentric part side abuts an end surface of the engagement part... allowing the engagement part to abut the flange part in a concentric state, thereby distributing the thrust load evenly across the flange part
Data Source
AI summary
A speed reducer includes a casing, a crankshaft, and a speed reducer main body. The crankshaft has a rotation support part rotatably supported by the casing and an eccentric part eccentric with respect to the rotation support part. The speed reducer main body has an engagement part engaged with an outer circumferential surface of the eccentric part, decelerates rocking rotation of the eccentric part received by the engagement part, and outputs the decelerated rotation to outside. The crankshaft is provided with a flange part protruding to an outward side in a radial direction from an end part of the rotation support part on the eccentric part side and abutting an end surface of the engagement part in an axial direction. The flange part is formed such that a center thereof coincides with a center of the eccentric part in a direction orthogonal to the axial direction.