Cross-Roller Rotary Table Layout for Low-Height Drive Transmission
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Solution Overview
Problem
Conventional rotary table devices are hindered by increased height, size, and weight due to the placement of motors between the rotary table and base, and the need for multiple bearings to support the rotary shaft.
Innovation Solution
A rotary table device design featuring a cross-roller bearing with an annular inner ring fixedly installed on the base, a hollow cylindrical outer ring, and a pinion gear engaging with a rack gear to transmit rotary drive force, reducing the number of components and height while allowing for stable rotation and load support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor is disposed between the rotary table and the base, then the rotary table can be rotated by a rotary drive force, but the height of the device increases
Solution Approach 1:
The patent combines the motor, transmission mechanism, and bearing support structure into an integrated assembly. The motor is positioned on the base with its output shaft extending upward, directly engaging the cross-roller bearing's outer ring, eliminating the need for separate height-consuming components between the motor and rotary table.
Solution Approach 2:
The patent transitions from a vertical stacking arrangement (motor above base, then rotary table) to a horizontal integration approach where the motor and transmission components are arranged in the radial plane, reducing the vertical dimension while maintaining functional separation.
2Stability of the object's composition
If a plurality of bearings are used to support the rotary shaft, then the rotary table can be stably supported, but the number of parts and device size increase
Solution Approach 1:
The cross-roller bearing's outer ring simultaneously performs multiple functions: it acts as the bearing raceway for radial load support, the rotary table mounting surface, and the gear component (rack gear or helical gear) for power transmission. This multi-functionality eliminates the need for separate bearings, mounting flanges, and gear components.
Solution Approach 2:
The patent merges the bearing support function with the power transmission function by integrating the gear teeth directly onto the bearing outer ring. This combination reduces the total number of parts while maintaining both rotational stability and efficient power transmission from the motor to the rotary table.
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 results in a reduced height, size, and weight of the rotary table device while maintaining stability and high durability through the use of a hypoid gear structure and sealing mechanisms, enabling efficient power transmission and preventing foreign substance intrusion.
Implementation Method 1
engagement of a pinion gear formed at a shaft end of the rotary drive shaft with a rack gear formed on the outer ring and transmission of a rotary drive force from the rotary drive shaft to the outer ring
Implementation Method 2
a cross-roller bearing including an annular inner ring fixedly installed on the base, an outer ring disposed on an outer peripheral side of the inner ring, and a plurality of rolling elements rollably disposed in a track space created between the inner ring and the outer ring
Data Source
AI summary
The rotary table device includes a base, a motor, a rotary drive shaft and a cross-roller bearing. An outer ring is rotationally driven through engagement of a pinion gear formed at a shaft end of the rotary rive shaft with a rack gear formed on the outer ring and transmission of a rotary drive force from the rotary drive shaft to the outer ring. The outer ring is formed in a hollow cylindrical shape covering a side of an inner ring, includes a table capable of mounting an external member on one side of the hollow cylindrical shape, and is integrated with the rack gear formed over an entire circumference of the other side thereof. With such a configuration, a rotary table device that can realize reduction in height, size and weight can be provided.