Inner Pin Holder Structure for Compact Speed Reducers
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Solution Overview
Problem
Conventional speed reducers face challenges in size reduction due to the need for fixing bolts in the shafts of inner pins, limiting the compactness of the device.
Innovation Solution
A speed reducer design featuring a ring-shaped external gear with through holes and inner pins held by an inner pin holder with separate holder portions and pillars, allowing fixing members to be inserted into the pillars instead of the shafts, reducing the size of the inner pins and enhancing design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fixing bolts are inserted into the shafts of inner pins, then the inner pins can be securely fixed, but the size of the inner pins increases and size reduction of the speed reducer becomes difficult
Solution Approach 1:
The patent extracts the fixing function from the inner pin shaft itself and relocates it to the inner pin holder. The fixing members are inserted into holding portions of the holder rather than into the inner pin shaft, thereby separating the fixing mechanism from the load-bearing shaft and enabling size reduction of the inner pin while maintaining secure fixation.
Solution Approach 2:
The inner pin holder acts as an intermediary component between the inner pin and the fixing members. The holder provides dedicated holding portions that receive the fixing members, serving as a mediator that enables secure fixation without requiring holes or features in the inner pin shaft itself.
2Adaptability or versatility
If holes are formed in the end portion of the inner pin shaft for fixing bolts, then the inner pin can be fixed, but the design flexibility is reduced and size reduction becomes difficult
Solution Approach 1:
The patent segments the fixing function from the inner pin assembly by introducing a separate inner pin holder component. The holder contains the fixing members in its holding portions, separating the fixation mechanism from the inner pin shaft and thereby improving design flexibility while enabling size reduction of the pin itself.
Solution Approach 2:
The fixing mechanism is extracted from the inner pin shaft and relocated to the inner pin holder. This extraction eliminates the need for holes in the pin shaft and allows independent optimization of the pin size and the holder structure, enhancing design flexibility.
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 design enables a more compact speed reducer with reduced friction and torque loss, facilitating size reduction and improved flexibility in design.
Implementation Method 1
a bearing disposed between the external gear and the input shaft and holding the input shaft such that the input shaft is rotatable relative to the external gear in the circumferential directions
Implementation Method 2
A plurality of inner pins penetrate the through holes in the axial directions; and an inner pin holder holding both ends of each of the inner pins
Data Source
AI summary
A speed reducer includes: ring-shaped external gear including outer teeth and through holes arranged circumferentially; input shaft penetrating space surrounded by an external gear inner circumferential surface; bearing between the external gear and input shaft; ring-shaped internal gear surrounding an external gear outer circumferential surface; inner pins penetrating the through holes axially; and inner pin holder holding both ends of each inner pin. The inner pin holder includes: first holder portion including a ring-shaped holding portion holding a first end of each inner pin; second holder portion including a ring-shaped holding portion holding a second end of each inner pin; and pillars connecting the first and second holder portion and penetrating the through holes. The speed reducer further includes fixing members that fix pillar end surfaces to the first holder portion or the second holder portion and are inserted in the pillars from the end surfaces of the pillars.