Extruder Transmission Gear Layout for Radial Load Distribution
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Solution Overview
Problem
The existing transmission gear systems for multi-screw extruders and kneaders face challenges in miniaturization due to increased bearing capacity and thrust loads, which complicate the system configuration and hinder the reduction of rotational play, leading to increased size and complexity.
Innovation Solution
A transmission gear system that includes a load distribution shaft opposite to the driving shaft, which distributes radial loads via a load distribution gear, allowing for reduced bearing capacity and increased shaft diameter without complicating the system configuration, thereby enhancing torque and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the tooth widths of the driving gear and driven gear are enlarged to increase transmission capacity, then the transmission load capacity is improved, but the distance between bearing parts increases and the load on bearing parts increases complexly
Solution Approach 1:
The patent introduces a load distribution shaft arranged radially opposite to the driving shaft, creating a new spatial dimension for load transmission. This allows radial loads to be distributed through a different geometric path, reducing the complexity of bearing arrangements on the driven shaft while maintaining transmission capacity.
Solution Approach 2:
The patent segments the load transmission path by introducing an intermediate load distribution shaft. Instead of transmitting all radial loads directly through the driven shaft's bearing parts, the load is divided and transmitted through separate paths: one through the driven shaft's bearing parts and another through the load distribution shaft's bearing parts, simplifying the overall bearing arrangement.
2Strength
If bearing capacity is increased to handle higher loads, then the load-bearing capability is improved, but the system configuration becomes complicated and miniaturization is hindered
Solution Approach 1:
The patent divides the bearing capacity requirement between two separate shafts: the driven shaft and the load distribution shaft. Each shaft has its own bearing parts that share the total load, allowing each bearing set to be smaller and simpler while collectively handling the same total load as a single high-capacity bearing system would require.
Solution Approach 2:
By arranging the load distribution shaft radially opposite to the driving shaft and using radial load transmission through gears, the patent creates an additional spatial dimension for load support. This distributes the bearing capacity requirement across different spatial locations, simplifying the configuration compared to increasing bearing capacity on a single shaft.
3Strength
If the driven shaft diameter is increased to handle thrust loads, then the thrust load capacity is improved, but the system size increases and miniaturization is impeded
Solution Approach 1:
The patent segments the thrust load handling function by introducing a load distribution shaft with its own bearing parts. The thrust load is distributed between the driven shaft and the load distribution shaft, allowing each shaft to have a smaller diameter while collectively handling the same total thrust load as a single larger shaft would require.
4Strength
If the number of gear meshing stages is increased to distribute radial load, then the load distribution is improved, but the system length increases and rotational play increases due to cumulative backlash
Solution Approach 1:
Instead of distributing radial load through multiple axial gear meshing stages that increase system length, the patent uses a radial arrangement with the load distribution shaft positioned opposite to the driving shaft. This creates a direct radial load transmission path that distributes load without requiring additional axial length, avoiding cumulative backlash issues.
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 configuration effectively distributes loads without increasing system complexity, allowing for increased shaft diameter and torque, while maintaining compactness and reducing rotational play, thus enhancing the performance and miniaturization potential of multi-screw extruder or kneader systems.
Implementation Method 1
A driving gear 104 is formed on the driving shaft 102, while a driven gear 105 engaged with the driving gear 104 is formed on the driven shaft 103, whereupon the rotational driving force of the driving shaft 102 is transmitted via the driving gear 104 and the driven gear 105
Implementation Method 2
The driving shaft 102 is rotatably supported by bearing parts 106 arranged in the vicinity before and after the driving gear 104, while the driven shaft 103 is rotatably supported by bearing parts 107 arranged in the vicinity before and after the driven gear 105
Implementation Method 3
The driven gear 103 is rotatably supported by a thrust bearing 117 at a right-hand end of Fig. 10
Data Source
Figure 1
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AI summary
It is possible to provide a transmission gear system of a multi-screw extruder or kneader, distributedly receiving loads applied on driven shafts without complicating the device configuration. The transmission gear system of a multi-screw extruder or kneader having a plurality of screw shafts, includes a driving shaft to which a driving gear is fixed, rotationally driven by a driving device; a driven shaft to which a driven gear engaged with the driving gear is fixed, the driven shaft being coupled to the screw shaft so as to allow the screw shaft to be rotationally driven; and a load distribution shaft disposed in a region opposite to the driving shaft with respect to the driven shaft. A radial load generated on the driven shaft is transmitted via the driven gear and the load distribution gear to the load distribution shaft to distribute the load.