Working Machine Bevel Gear Support for Uniform Planetary Contact
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Solution Overview
Problem
In working machines, the application of force to the bevel gear due to a reaction from a workpiece causes the shaft portion to tilt, leading to uneven contact between the first planetary gear and the sun gear or internal gear, disrupting the gear mechanism's functionality.
Innovation Solution
The implementation of a second bearing that supports the first carrier to prevent its displacement orthogonal to the rotation axis, thereby maintaining the stability of the bevel gear's shaft portion and preventing uneven contact between the planetary gear and sun/internal gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the first bearing supports the shaft portion, then the device complexity is reduced, but the shaft portion tilts under load causing uneven gear contact
Solution Approach 1:
The second bearing acts as an intermediary support element that prevents the shaft portion from tilting under load. By introducing this intermediate bearing support, the system maintains shaft alignment and prevents uneven contact between the planetary gear and sun gear, resolving the reliability issue without significantly increasing overall complexity.
Solution Approach 2:
The bearing support function is segmented into two separate bearings: the first bearing supports the shaft portion while the second bearing specifically supports the carrier. This segmentation allows each bearing to handle specific loads and prevents tilting, ensuring uniform gear contact while maintaining structural simplicity.
2Stability of the object's composition
If the shaft portion is supported by bearings, then the gear mechanism stability is improved, but the device complexity increases
Solution Approach 1:
The support function is divided between two bearings with distinct roles: the first bearing supports the shaft portion for rotational movement, while the second bearing supports the carrier to prevent tilting. This segmentation provides comprehensive stability without requiring a single complex bearing system.
Solution Approach 2:
The second bearing serves as an intermediary that specifically addresses the tilting issue of the shaft portion. By introducing this intermediate support, the system achieves enhanced stability while keeping the bearing configuration relatively simple and modular.
3Ease of operation
If the first carrier is free to move, then the ease of operation is improved, but the planetary gear contacts unevenly with sun gear and internal gear
Solution Approach 1:
The second bearing acts as an intermediary constraint that prevents the carrier from moving in the orthogonal direction while allowing it to rotate. This intermediate support maintains precise gear contact between the planetary gear, sun gear, and internal gear, ensuring manufacturing precision is maintained during operation.
Solution Approach 2:
The carrier is designed to be dynamically supported by the second bearing, allowing rotational movement while constraining orthogonal displacement. This dynamic support ensures the carrier maintains the correct position for precise gear engagement throughout its rotation, balancing ease of operation with contact precision.
Data Source
AI summary
A working machine may include a prime mover, a power transmission, a working part, and a housing. The power transmission may include a first planetary gear mechanism, a bevel gear, a first bearing, and a second bearing. The bevel gear may include a gear portion and a shaft portion. The first planetary gear mechanism may include a first carrier integrally rotatable with the shaft portion, a first planetary gear rotatably supported by the first carrier, a first internal gear arranged outward of the first planetary gear, and a first sun gear arranged inward of the first planetary gear. The first bearing may be directly or indirectly supported by the housing and support the shaft portion such that the shaft portion is rotatable. The second bearing may be directly or indirectly supported by the housing and support the first carrier such that the first carrier is rotatable.