Motor Speed Reduction Mechanism Damper Integration
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Solution Overview
Problem
Conventional motors with speed reduction mechanisms for power window applications require high-stress support shafts and fastening members, which increase production costs and do not provide adequate impact resistance and silence.
Innovation Solution
A motor with a speed reduction mechanism that incorporates a damper member elastically deformed between the worm wheel and output member, housed in a bulged portion, eliminating the need for fastening members and reducing support shaft rigidity, while ensuring effective torque transmission and noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper member is provided between the worm wheel and output member to reduce abrupt torque transmission, then impact resistance and silence are improved, but the structure becomes more complex and requires additional fastening members
Solution Approach 1:
The damper member is integrated into the output member as a unified structure. The output member includes a damper portion that directly engages with the worm wheel, eliminating the need for separate fastening members to secure the damper. This merging of functions reduces structural complexity while maintaining impact resistance and noise suppression capabilities.
2Object-generated harmful factors
If a damper member is provided to absorb impact, then noise and vibration are reduced, but production cost increases due to additional components
Solution Approach 1:
The damper function is merged into the output member structure, which is already required for torque transmission. By making the output member include both the torque transmission function and the damping function in a single integrated component, the total part count is reduced, simplifying assembly and lowering production costs while maintaining noise reduction performance.
3Strength
If the support shaft is made of high-rigidity steel material to withstand axial stress, then structural strength is improved, but production cost increases
Solution Approach 1:
The axial stress that would normally be borne by the support shaft is extracted and redirected to the worm wheel structure. The worm wheel is designed with a bottom wall portion that has high rigidity in the axial direction, and this portion directly supports the output member. By transferring the load-bearing function from the support shaft to the worm wheel, the support shaft can use lower-rigidity, less expensive materials while maintaining overall structural strength.
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
The solution enhances impact resistance, silence, and reduces production costs by eliminating the need for high-stress support shafts and fastening members, while maintaining efficient torque transmission and noise suppression.
Implementation Method 1
a damper member provided between the worm wheel and the output member and elastically deformed by a relative rotation of the worm wheel and the output member
Data Source
AI summary
A damper member (80) is provided between the worm wheel (39) and the output member (70), and elastically deformed by a relative rotation of the worm wheel (39) and the output member (70), a gap portion (SP) is provided between the worm wheel (39) and the output member (70), a portion (DP) bulged by elastic deformation of the damper member (80) is housed in the gap portion (SP), the portion (DP) bulged by elastic deformation of the damper member (80) does not push the output member (70) away from the worm wheel (39). Therefore, although it has the damper member (80), it is not necessary to fix the output member (70) so as to prevent the output member (70) from being moved in an axial direction of a support shaft by using a fixing member on the basis of a conventional manner, thereby making it possible to reduce the intensity of the support shaft, and consequently, it is possible to realize excellent shock resistance and silence, and cost reduction.