Robot Wrist Rotation Support Mechanism for Compact Design
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Solution Overview
Problem
Existing robots face a challenge in reducing their size while maintaining operational efficiency, leading to increased size and slower operating speeds due to the conventional disposition of rotation mechanisms along the rotation axis.
Innovation Solution
A robot design featuring a rotation support mechanism with a shaft section, bearing, and ring-shaped oil seal concentrically disposed around the center axis, where the oil seal has a concave section open to one arm, preventing dust and dirt ingress and allowing for reduced size and improved airtightness, with the option of using different materials for the shaft and ring members to enhance durability and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bearing, ring member and oil seal are disposed along the direction of the rotation axis, then the rotation support mechanism can be assembled, but the size of the robot is increased
Solution Approach 1:
The patent transitions from a linear arrangement (along the rotation axis) to a radial arrangement (concentric around the rotation axis). The bearing, ring member, and oil seal are disposed concentrically in the radial direction, allowing the rotation support mechanism to be compact in the axial direction while maintaining ease of assembly through standardized radial mounting structures.
2Reliability
If the shaft section, bearing, ring member and oil seal are disposed along the center axis direction, then the rotation support mechanism functions properly, but the operating speed is reduced due to increased size
Solution Approach 1:
By reorganizing the components from an axial linear sequence to a radial concentric arrangement, the patent reduces the axial length of the rotation support mechanism. This dimensional change allows the robot to maintain proper rotation support function while decreasing the overall size, thereby improving operating speed.
3Object-affected harmful factors
If the oil seal has a concave section open to the arm, then dust and dirt are prevented from invading, but the structure becomes more complex
Solution Approach 1:
The concave section of the oil seal is designed to receive and nest the arm portion, creating a protective enclosure. This nesting arrangement allows the arm to be positioned within the concave section, effectively blocking dust and dirt from invading the oil seal interface while maintaining a compact integrated structure.
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
This configuration effectively reduces the robot's size along the center axis, enhancing its operating speed and maintaining airtightness, while preventing abrasion and dust ingress, thus improving overall performance and cost-effectiveness.
Implementation Method 1
a bearing which is disposed on an outer periphery section of the shaft section and rotatably supports the shaft section around a center axis of the shaft section
Implementation Method 2
the concave section is blocked by a portion of the other side arm. Accordingly, dust or dirt can be prevented from invading the concave section
Implementation Method 3
a ring-shaped oil seal which is provided in the other side arm and slides with respect to the ring member by abutting the outer periphery section of the ring member according to the rotation of the shaft section
Data Source
AI summary
A robot includes an arm, a wrist and a rotation support mechanism The rotation support mechanism has a shaft section provided in the wrist and an outer shape of which is a column shape; a bearing which is disposed on an outer periphery section of the shaft section and rotatably supports the shaft section around a center axis thereof; an annular-shaped ring member provided in the wrist and is concentrically disposed with the bearing by separating on the outer periphery side of the bearing; and an annular-shaped oil seal provided in the arm and slides with respect to the ring member by abutting the outer periphery section of the ring member and holding airtightness with the ring member according to the rotation of the center shaft of the shaft section.