Gearbox Pitch Diameter Layout for Constant Impeller Speed
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Solution Overview
Problem
In conventional rotating machines, changes in power frequency lead to variations in impeller rotation speed, necessitating adjustments in gear diameters which alter the machine's main body size and increase manufacturing costs due to the need for customized component layouts.
Innovation Solution
A manufacturing method for a gear box that maintains a constant impeller rotation speed by setting reference center-to-center distances and rotation speeds, adjusting pitch circle diameters of bull and pinion gears to match these references, ensuring consistent dimensions regardless of power frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gear diameter of bull gear or pinion gear is changed to maintain constant impeller rotation speed, then rotation speed stability is improved, but main body size changes and manufacturing cost increases
Solution Approach 1:
The patent applies dynamics by making the gear system adaptable to different power frequencies through variable gear ratio configurations. The bull gear and pinion gear can be selectively changed to achieve different transmission ratios, allowing the system to maintain constant impeller rotation speed across different power frequencies without requiring a fixed gear configuration.
Solution Approach 2:
The patent changes the transmission ratio parameter by selecting different combinations of bull gear and pinion gear with different tooth counts. This allows adjustment of the gear ratio to compensate for power frequency variations, maintaining constant impeller speed while avoiding the need to change the physical dimensions of the main body housing.
2Reliability
If gear diameter is adjusted to compensate for power frequency changes, then rotation speed consistency is improved, but center-to-center distance changes requiring layout redesign
Solution Approach 1:
The system dynamically adjusts the gear ratio through selective gear combination rather than physically moving gear centers. This maintains the fixed center-to-center distance of the main body while achieving variable transmission ratios needed for different power frequencies.
Solution Approach 2:
The transmission ratio is changed by selecting gears with different tooth counts rather than changing the spatial arrangement. This allows parameter adjustment of the gear system while keeping the mechanical layout and center distances constant, avoiding redesign of auxiliary component positions.
Data Source
AI summary
A manufacturing method of a gear box for a rotating machine for transmitting power of a motor, the gear box including a bull gear connected to an input shaft of the motor and a pinion gear meshing with the bull gear, forms the bull gear and the pinion gear based on a design result determined using a designing method of a gear box. In the designing method of a gear box, pitch circle diameters of the bull gear and the pinion gear are determined such that a rotation speed of the pinion gear is the same and a center-to-center distance of a bull gear and the pinion gear is the same regardless of a frequency of AC power supplied to the motor.