Bucket Drive Transmission with Integrated Resin Bush Impact Buffer
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Solution Overview
Problem
Conventional drive transmission devices and construction machinery face challenges in reducing size while effectively mitigating external impact loads, as the incorporation of elastic members and stopper pins requires separate locations from the gear mechanism, making it difficult to minimize overall dimensions.
Innovation Solution
A drive transmission device with a buffer member, such as a resin bush, is integrated between the fixing member and the second member, absorbing external impact loads and reducing the need for additional space, allowing for a compact design by incorporating the buffer member as part of the speed changer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member and stopper pin are installed separately from the gear mechanism to mitigate external impact loads, then the impact load transmission is reduced, but the overall device size increases due to additional installation spaces
Solution Approach 1:
The buffer member is integrated directly into the gear mechanism structure, specifically positioned between the pin and the through hole in the gear device. This merging eliminates the need for separate installation spaces while maintaining the impact mitigation function, thereby resolving the contradiction between reliability improvement and device size increase
Solution Approach 2:
The buffer member is nested within the existing structural components of the gear mechanism, fitting into the space between the pin and the through hole. This nesting approach allows the buffer member to be accommodated without adding external dimensions, thus mitigating impact loads while keeping the device compact
2Reliability
If the buffer member is made of resin with lower mechanical strength, then impact absorption is improved, but the structural strength at the connection point is reduced
Solution Approach 1:
The buffer member is made of resin with lower mechanical strength specifically at the location where impact absorption is needed, while the rest of the gear mechanism maintains its original high-strength materials. This local quality change allows impact absorption without compromising the overall structural strength of the connection
Solution Approach 2:
The connection structure uses a composite arrangement where the resin buffer member is combined with the metal pin and gear components. The resin layer absorbs impact energy while the metal components provide structural strength, creating a composite system that achieves both impact absorption and structural integrity
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 integration of the buffer member within the speed changer reduces the device's size while effectively mitigating impact loads, enhancing mechanical strength and durability without the need for separate installation spaces.
Implementation Method 1
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
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AI summary
A drive transmission device (1) according to one embodiment of the invention includes: an arm (109) having a motor that generates a rotational force; a speed reducer (3) that is provided in the arm (109) and has a carrier (14) for decelerating rotation of the motor and outputting the decelerated rotation; a bucket (110) fixed to the carrier (14) by a reamer bolt (80), the reamer bolt (80) being inserted in a bracket through hole (115) formed in the bucket; and a resin bush (82) provided between an internal surface of the bracket through hole (115) and an external lateral surface of the reamer bolt (80). The mechanical strength of the resin bush (82) is lower than the mechanical strength of the bucket (110) and the mechanical strength of the reamer bolt (80).