Powertrain Shaft Coupling With Wave Spring for Axial Impact Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The assembly complexity and cost of powertrains are high due to the fastening of motor output shafts, leading to increased wear and noise when the shafts collide during axial impacts.
Innovation Solution
A powertrain design with an elastic component between the output and input shafts, allowing axial movement and using limiting platforms and coupling surfaces for transmission, with a waveform spring providing axial preload and adapting to different operational states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor output shaft is completely fastened to eliminate axial movement, then the transmission connection is stable, but the assembly complexity and manufacturing requirements increase
Solution Approach 1:
The patent applies the dynamics principle by allowing the motor output shaft to have controlled axial movement capability through the elastic component (waveform spring) rather than completely fastening it. The waveform spring enables the output shaft to dynamically adapt to axial impacts while maintaining transmission connection, eliminating the need for complex fastening structures and reducing assembly complexity.
2Reliability
If the motor output shaft is completely fastened, then the transmission connection is stable, but the manufacturing requirements and design complexity of housing increase
Solution Approach 1:
The waveform spring provides dynamic compliance that absorbs axial movements, eliminating the need for high-precision manufacturing of housing and fastening structures. The elastic component compensates for manufacturing tolerances and reduces the stringency of assembly requirements.
3Stability of the object's composition
If the motor output shaft is rigidly fastened, then structural stability is maintained, but wear and noise increase during axial impacts
Solution Approach 1:
The waveform spring acts as a pre-installed cushioning element between the motor output shaft and the load. During axial impacts, the elastic component absorbs the impact energy through deformation, preventing direct collision between rigid components. This beforehand cushioning reduces wear and noise while maintaining structural stability.
Solution Approach 2:
The elastic component serves as an intermediary element between the motor output shaft and the driven load. This mediator absorbs axial movements and impacts, preventing direct contact and friction between rigid surfaces, thereby reducing wear and noise generation.
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
Reduces assembly requirements, minimizes wear and noise, and enhances stability by allowing the elastic component to adapt to axial impacts, thus improving the powertrain's operational efficiency and durability.
Implementation Method 1
an elastic component is disposed between the output shaft and the input shaft, allowing the motor to have an axial movement during running
Implementation Method 2
with a waveform spring providing axial preload and adapting to different operational states
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
A powertrain includes a motor, a reducer, and an elastic component. The reducer includes an input shaft, the motor includes an output shaft, the input shaft is coaxially coupled to the output shaft, a coupling end of the input shaft includes a first limiting platform and a first coupling surface, and a coupling end of the output shaft includes a second limiting platform and a second coupling surface. The first coupling surface and the second coupling surface are disposed opposite to each other along a radial direction of the input shaft, and the first coupling surface is in contact with the second coupling surface, so that the output shaft is in transmission connection with the input shaft. The first limiting platform and the second limiting platform are disposed opposite to each other along an axial direction of the input shaft. The elastic component is fastened between the first limiting platform and the second limiting platform. The first limiting platform and the second limiting platform are disposed opposite to each other along the axial direction of the input shaft, and the elastic component is disposed between the first limiting platform and the second limiting platform. The elastic component allows the motor to move axially in an operation process. Compared with a manner in which inner and outer rings of a bearing of a fixed motor are completely fastened, this reduces an assembly requirement of the motor and a design requirement of a housing