Speed Reducer Carrier Bolt Structure for Easier Thread Repair
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Solution Overview
Problem
Conventional speed reducers for industrial robots require costly and time-consuming repairs when tapped holes are damaged due to excessive torque, as the entire carrier needs to be replaced.
Innovation Solution
A speed reducer design where a separate bolt with a male threaded portion is provided in the transmission portion, allowing for easy replacement when damaged, reducing repair time and cost by avoiding direct formation of female threaded portions in the carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If female threaded portions are directly formed in the carrier (transmission portion), then the connection strength between the carrier and connection member is improved, but the ease of repair deteriorates when the threaded portions are damaged
Solution Approach 1:
The patent divides the threaded connection system into two separate components: the carrier (transmission portion) and the bolt. The female threaded portion is formed in the bolt rather than directly in the carrier, allowing the bolt to be replaced independently when damaged, while the carrier remains intact. This segmentation enables easy repair by simply replacing the bolt without replacing the entire carrier.
2Reliability
If the carrier is replaced when the tapped hole is damaged, then the reliability of the transmission portion is restored, but the loss of time and cost for repair increases
Solution Approach 1:
By making the bolt a replaceable component with the female threaded portion, the patent enables independent replacement of the bolt from the carrier. When the threaded portion is damaged, only the bolt needs to be replaced rather than the entire carrier, significantly reducing repair time and cost while restoring reliability.
Solution Approach 2:
The bolt is designed as a replaceable, relatively simple component compared to the carrier. When the bolt's threaded portion is damaged, it can be replaced with a new, inexpensive bolt rather than replacing the entire carrier, reducing the loss of time and cost for repair.
3Duration of action of stationary object
If the bolt is made of harder material than the transmission portion, then the durability of the male threaded portion is improved, but the difficulty of manufacture increases
Solution Approach 1:
The patent applies different material properties to different components based on their functional requirements. The bolt is made of harder material specifically at the male threaded portion to improve durability and resistance to damage during fastening operations, while other parts of the bolt and the carrier can use more easily manufactured materials. This local differentiation of material quality optimizes both durability and manufacturability.
Data Source
AI summary
A speed reducer according to one embodiment of the disclosure includes: a casing; a carrier disposed rotatably relative to the casing; a speed reduction mechanism that is disposed in the casing and reduces rotation inputted from a motor and outputs reduced rotation; and a bolt protruding from the carrier toward the outside of the casing. The bolt has a male threaded portion that is configured to engage with a female threaded portion provided in a second arm.