Cross-Roller Speed Reducer Layout for Reduced Axial Thickness
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Solution Overview
Problem
Conventional speed reducers have a large axial thickness, limiting their compactness.
Innovation Solution
A speed reducer design featuring a ring-shaped external gear with outer teeth and through holes, an input shaft, inner pins, and a bearing system that allows for reduced axial thickness by integrating the inner ring and pin holder, enabling a more compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the outer pin holder and inner ring of the cross roller bearing are arranged in the axial direction, then the bearing function is ensured, but the axial thickness becomes large
Solution Approach 1:
The patent merges the outer pin holder and the inner ring of the cross roller bearing into a single integrated component. The outer pin holder is designed with an inner circumferential surface that directly receives the rollers of the cross roller bearing, eliminating the need for a separate inner ring. This integration reduces the axial thickness while maintaining the bearing functionality.
Solution Approach 2:
The outer pin holder is designed to serve multiple functions: it holds the outer pins, supports the cross roller bearing, and provides the inner circumferential surface for roller contact. This multi-functionality eliminates the need for separate components, thereby reducing axial thickness while ensuring proper bearing operation.
2Length of moving object
If the speed reducer is made compact in axial direction, then the axial thickness is reduced, but the bearing support function may be compromised
Solution Approach 1:
The outer pin holder is integrated with the bearing support structure, combining the functions of pin holding and bearing support into a single robust component. This integration ensures that the bearing support reliability is maintained while achieving compact axial dimensions.
Solution Approach 2:
The cross roller bearing uses curved raceway surfaces on the outer pin holder to properly support the rollers. The inner circumferential surface is formed with appropriate curvature to ensure proper roller contact and load distribution, maintaining bearing reliability in the compact design.
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 achieves a more compact axial profile and improved lubrication efficiency, reducing friction and rotation torque, while allowing for flexible design options and weight reduction.
Implementation Method 1
a roller that contacts an inner circumferential surface of the outer ring and an outer circumferential surface of the inner ring
Implementation Method 2
improved lubrication efficiency, reducing friction and rotation torque
Data Source
AI summary
A speed reducer includes: ring-shaped external gear including outer teeth, first through hole and multiple second through holes circumferentially surrounding the first; input shaft penetrating the first through hole; first bearing holding the input shaft rotatable to the external gear circumferentially; multiple inner pins penetrating the second through holes axially; inner pin holder surrounding the input shaft outer circumferential surface; second bearing surrounding the external gear outer circumferential surface; and internal tooth pins meshing with outer teeth. The second bearing includes an inner pin holder outer ring, inner ring inside the outer ring radially and output shaft rotating slower than the input shaft, a roller contacting an outer ring inner circumferential surface and an inner ring outer circumferential surface. The inner ring includes a ring shape pin holding portion surrounding the external gear outer circumferential surface, holding the internal tooth pin, and extending along an inner ring inner circumferential surface.