Arm Drive Transmission Bush for Compact Impact Load Absorption
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Solution Overview
Problem
Conventional drive transmission devices struggle to minimize size while effectively mitigating external impact loads, as incorporating elastic members and stoppers within the gear mechanism is challenging, leading to increased device size due to the need for separate installation.
Innovation Solution
Incorporating a buffer member with lower mechanical strength than the gear mechanism components between the fixing member and the second member, allowing absorption of external impact loads without requiring additional space, thus enabling size reduction while maintaining effective load mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member and stopper pin are installed in separate locations from the gear mechanism to mitigate external impact loads, then the impact load transmission is reduced, but the overall device size increases
Solution Approach 1:
The buffer member is integrated into the gear mechanism by being fitted between the outer surface of the fixing member and the inner surface of the through hole in the second member. This merging of the buffer function into the existing gear mechanism structure eliminates the need for separate installation locations, thereby reducing overall device size while maintaining impact load mitigation capability
Solution Approach 2:
The buffer member is nested within the through hole of the second member, utilizing the existing spatial structure. The buffer member fits concentrically within the through hole space, effectively using unused internal volume to accommodate the impact-mitigating component without increasing external dimensions
2Reliability
If the buffer member is made with lower mechanical strength to absorb impact loads, then impact absorption capability is improved, but the structural strength is reduced
Solution Approach 1:
The buffer member is made of resin material with specifically lower mechanical strength compared to the metal components (second member and fixing member). This local quality difference is intentional and functional: the weaker buffer member deforms preferentially to absorb impact energy, while the stronger surrounding structural components maintain overall structural integrity
Solution Approach 2:
The buffer member acts as an intermediary element between the fixing member and the second member. It mediates the force transmission by absorbing impact loads through its lower strength material properties, protecting the stronger structural components from direct impact damage while maintaining the functional connection
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 effectively reduces the size of the drive transmission device by integrating the buffer member within the gear mechanism, absorbing external impact loads and extending the product life by preventing exposure to foreign matter, while maintaining high output and resistance to overloads and impact loads.
Implementation Method 1
a buffer member provided between an external lateral surface of a fixing member and an internal surface of a through hole... A mechanical strength of the buffer member is lower than a mechanical strength of the second member and a mechanical strength of the fixing member
Data Source
AI summary
A drive transmission device according to one embodiment of the disclosure includes: an arm having a motor that generates a rotational force; a speed reducer that is provided in the arm and has a carrier for decelerating rotation of the motor and outputting the decelerated rotation; a bucket fixed to the carrier by a reamer bolt, the reamer bolt being inserted in a bracket through hole formed in the bucket; and a resin bush provided between an internal surface of the bracket through hole and an external lateral surface of the reamer bolt. The mechanical strength of the resin bush is lower than the mechanical strength of the bucket and the mechanical strength of the reamer bolt.