Coaxial Drive Transmission Layout for Balanced Rotary Actuator Loads
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Solution Overview
Problem
Construction machines face challenges with unbalanced radial and moment loads when using rotary actuators, leading to increased size and reduced service life of speed reducers due to heavy loads.
Innovation Solution
A drive transmission device with a shaft portion, reduction unit, and housing portion configured to be rotatable about a rotation axis, featuring a coaxial arrangement with a labyrinth seal and bearing system to evenly distribute loads, reducing the need for two reduction units and inhibiting size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rotary actuator is used, then efficiency is improved, but radial and moment loads become unbalanced
Solution Approach 1:
The patent applies asymmetry by positioning the single reduction unit and speed reducer at specific asymmetric locations on the rotary actuator. The reduction unit is arranged on one side while the speed reducer is positioned on the opposite side, creating an asymmetric configuration that balances radial and moment loads while maintaining rotational efficiency.
2Strength
If the size of the actuator is increased to achieve required strength, then strength is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the reduction unit and speed reducer into a single integrated assembly. By combining these two functional components and positioning them at opposite sides of the rotary actuator, the design achieves required strength without proportionally increasing overall size, as the components share the load distribution.
Solution Approach 2:
The patent distributes components along the rotational dimension of the actuator rather than concentrating them in one location. By arranging the reduction unit and speed reducer at opposite sides around the rotation axis, the design optimizes strength distribution without increasing the actuator's radial footprint.
3Stability of the object's composition
If two reduction units are used to balance loads, then load balance is improved, but device complexity and size increase
Solution Approach 1:
The patent uses asymmetric positioning of a single reduction unit combined with a speed reducer to achieve load balance without duplicating the reduction unit. The asymmetric arrangement allows one reduction unit to effectively balance loads by strategic placement rather than requiring two identical units.
Data Source
AI summary
A drive transmission device of the present disclosure includes a first member and a second member, a drive source, two bracket portions, a shaft portion, a reduction unit having an output portion, and a housing portion. The first member and the second member are coupled to each other so as to be rotatable about a rotation axis. The two bracket portions are provided on the second member and are spaced apart from and opposed to each other. The shaft portion is connected to the first member and positioned between the bracket portions. The output portion is attached to the shaft portion and attached to an opposed surface of a first bracket portion. The housing portion is coupled to the shaft portion so as to be rotatable about the rotation axis, the housing portion being attached to an opposed surface of a second bracket portion.