Double Helical Gear Assembly With Passive Axial Bearing Positioning
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Solution Overview
Problem
The existing manufacturing methods for power transmission mechanisms with double helical gears face challenges in accurately determining the axial position of these gears, leading to potential single tooth contact, vibrations, and noise, while also complicating the manufacturing process due to the need for shims of varying thicknesses.
Innovation Solution
A manufacturing method that includes using rolling bearings with a curable resin to passively position double helical gears by allowing axial movement during assembly and rotation, ensuring accurate alignment and fixing the position once the resin cures, thereby simplifying the process and reducing vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a highly efficient bearing is used to restrict axial movement of the rotation shaft, then power transmission efficiency is improved, but axial displacement of the double helical gear is not permitted, making it difficult to achieve accurate axial positioning and prevent single tooth contact
Solution Approach 1:
The method applies preliminary action by allowing axial movement during the assembly and positioning phase, then fixing the gear in its optimal position after alignment is achieved. The bearing initially permits axial displacement to enable the aligning action, and once the gear is properly positioned through rotation, the bearing's restriction function takes over to maintain the position and prevent future axial movement.
Solution Approach 2:
The solution employs dynamics by transitioning the bearing from a static restriction state to a dynamic state during assembly. The bearing allows axial movement when needed for positioning, then restricts movement when the gear is properly aligned. This dynamic behavior enables both accurate positioning and prevention of single tooth contact.
2Manufacturing precision
If shims of different thicknesses are prepared to adjust the axial position of the double helical gear, then axial positioning can be achieved, but the manufacturing process becomes complicated and it is not easy to determine the accurate axial position
Solution Approach 1:
The method applies self-service by allowing the double helical gear to automatically position itself through aligning action during rotation. The gear naturally seeks its optimal position through the mechanical interaction at the meshing portion, eliminating the need for external adjustment mechanisms like shims. The system uses its own operational characteristics to achieve accurate positioning.
Solution Approach 2:
The solution replaces the mechanical shim adjustment system with a rotational positioning system. Instead of using multiple shims of different thicknesses to achieve axial positioning, the method uses the aligning action that occurs during gear rotation to automatically determine and establish the correct axial position. This substitution simplifies the manufacturing process by eliminating the need for multiple shim components and complex selection procedures.
3Loss of energy
If the axial position of the double helical gear is fixed using a bearing that restricts axial movement, then power transmission efficiency is improved, but the aligning action cannot work at the meshing portion, causing single tooth contact and vibration
Solution Approach 1:
The method applies preliminary action by enabling axial movement during the assembly and positioning phase to allow the aligning action to work, then fixing the gear in its optimal position after alignment is achieved. The bearing initially permits axial displacement so that the aligning action can occur during rotation, and once proper alignment is established, the bearing's restriction function prevents further axial movement, eliminating single tooth contact and vibration.
4Object-generated harmful factors
If the axial position of the double helical gear is allowed to move axially to enable aligning action, then double tooth contact is achieved and vibrations are reduced, but the power transmission efficiency is lowered
Solution Approach 1:
The solution employs dynamics by transitioning the bearing from a static restriction state to a dynamic state during assembly. The bearing allows axial movement when needed for positioning, then restricts movement when the gear is properly aligned. This dynamic behavior enables both accurate positioning and prevention of single tooth contact.
Solution Approach 2:
The method applies preliminary action by enabling axial movement during the assembly and positioning phase to allow the aligning action to work, then fixing the gear in its optimal position after alignment is achieved. The bearing initially permits axial displacement so that the aligning action can occur during rotation, and once proper alignment is established, the bearing's restriction function prevents further axial movement, eliminating single tooth contact and vibration.
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 method effectively simplifies the manufacturing process, reduces vibrations and noise, and ensures accurate axial positioning of double helical gears, even with high-efficiency bearings that restrict axial movement, by utilizing the aligning action during meshing to determine the optimal gear position.
Implementation Method 1
a first rolling bearing configured to rotatably support the first shaft with respect to a case and restrict a movement of the first shaft in an axial direction thereof; and a second rolling bearing configured to rotatably support the second shaft with respect to the case and restrict a movement of the second shaft in an axial direction thereof
Data Source
AI summary
A manufacturing method for a power transmission mechanism including: first and second shafts having first and second double helical gears; first and second rolling bearings rotatably supporting the shafts with respect to a case and restrict movement of the shafts in an axial direction thereof, includes an assembling step of assembling an outer ring of the first rolling bearing and an outer ring of the second rolling bearing to the case in a state where the outer rings are movable in the respective axial directions; and a positioning step of determining axial positions of the first rolling bearing and the second rolling bearing while rotating the first shaft and the second shaft in a state where the first double helical gear and the second double helical gear are meshed with each other, after the assembling step.