Robot Arm Bearing Case With Segmented Adjustment Mechanism
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Solution Overview
Problem
In vertical articulated robots, the bearing supporting the input bevel gear can be displaced or damaged during tooth contact adjustment with the output bevel gear, leading to mechanical failures.
Innovation Solution
A robot arm design featuring a bearing case with preloaded angular ball bearings and a tapered guide section, allowing the input bevel gear unit to be easily inserted and removed, and a separate adjustment mechanism for tooth contact and backlash, preventing direct collision with other arm components during adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the input bevel gear is moved along the fifth rotation axis to perform tooth contact adjustment with the output bevel gear, then the tooth contact adjustment is achieved, but the bearing may be displaced or damaged
Solution Approach 1:
The wrist section is divided into functionally independent modules: the bearing housing module (containing bearings and input bevel gear) and the adjustment mechanism module (containing adjustment screw and locking mechanism). This segmentation allows tooth contact adjustment to be performed independently without moving the entire bearing assembly, thus preventing bearing displacement or damage while achieving proper gear meshing
Solution Approach 2:
An adjustment screw acts as an intermediary mechanism between the operator and the input bevel gear. Instead of directly moving the gear along the rotation axis (which would displace bearings), the adjustment screw translates rotational motion into precise linear displacement of the gear, enabling controlled tooth contact adjustment without bearing displacement
2Ease of operation
If the input bevel gear is moved along the fifth rotation axis for tooth contact adjustment, then the gear meshing is adjusted, but the bearing may come into contact with the input bevel gear or second upper arm and be broken
Solution Approach 1:
The wrist section is divided into functionally independent modules: the bearing housing module (containing bearings and input bevel gear) and the adjustment mechanism module (containing adjustment screw and locking mechanism). This segmentation allows tooth contact adjustment to be performed independently without moving the entire bearing assembly, thus preventing bearing displacement or damage while achieving proper gear meshing
Solution Approach 2:
An adjustment screw acts as an intermediary mechanism between the operator and the input bevel gear. Instead of directly moving the gear along the rotation axis (which would displace bearings), the adjustment screw translates rotational motion into precise linear displacement of the gear, enabling controlled tooth contact adjustment without bearing displacement
3Device complexity
If the bearing case is designed to house both bearings and input bevel gear, then the structure is compact, but the bearing may be damaged during adjustment operations
Solution Approach 1:
The wrist section is divided into functionally independent modules: the bearing housing module (containing bearings and input bevel gear) and the adjustment mechanism module (containing adjustment screw and locking mechanism). This segmentation allows tooth contact adjustment to be performed independently without moving the entire bearing assembly, thus preventing bearing displacement or damage while achieving proper gear meshing
Solution Approach 2:
An adjustment screw acts as an intermediary mechanism between the operator and the input bevel gear. Instead of directly moving the gear along the rotation axis (which would displace bearings), the adjustment screw translates rotational motion into precise linear displacement of the gear, enabling controlled tooth contact adjustment without bearing displacement
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 design enhances the rotational accuracy and rigidity of the robot arm, reduces the risk of bearing damage, and facilitates easy adjustment of tooth contact and backlash without affecting preload, thereby improving the reliability and longevity of the robot system.
Implementation Method 1
a first bearing and a second bearing that are disposed inside the bearing case, that support so that the first gear rotates around a first rotation axis with respect to the first arm
Data Source
AI summary
A robot arm includes a first arm having a first insertion hole and a second insertion hole that communicate with each other inside, a bearing case inserted into the first insertion hole, a first gear passed through the bearing case and inserted into the first insertion hole, a first bearing and a second bearing located apart from each other along the first rotation axis in the bearing case, as the first bearing and the second bearing rotatably supports the first gear about the first rotation axis so as to the first arm, and a second gear that is inserted into the second insertion hole and meshes with the first gear in the first arm.