Roller-Guided Reducer Structure for Low-Noise Durable Speed Reduction
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Solution Overview
Problem
Conventional reducers, such as harmonic and cycloid reducers, face issues with low durability, high machining costs due to accuracy requirements, and excessive noise and vibrations, which affect their precision and manufacturing simplicity.
Innovation Solution
A reducer design featuring a hollow input shaft with a driving surface, an output shaft with a gear, rollers aligned between the shafts, and ring-shaped caps guiding the rollers' radial movement, along with elastic rings to pressurize the rollers against the driving surface, reducing noise and vibrations, and simplifying the configuration for easier manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional harmonic reducer uses elastic deforming part, then rotational speed reduction is achieved, but durability deteriorates due to breakage of the elastic deforming part
Solution Approach 1:
The invention extracts and eliminates the elastic deforming part from the harmonic reducer system. Instead of using an elastic wave generator that is prone to breakage, the patent employs rigid rollers that rotate in guide grooves, completely removing the fragile elastic component while maintaining the speed reduction function through a different mechanical mechanism.
Solution Approach 2:
The invention replaces the expensive and fragile elastic deforming part with simpler, more durable rigid rollers. These rollers can be easily manufactured and replaced if needed, providing a cost-effective and reliable alternative that does not suffer from the inherent durability issues of elastic materials under continuous cyclic loading.
2Manufacturing precision
If conventional cycloid reducer uses eccentric movement mechanism, then speed reduction is achieved, but manufacturing precision deteriorates due to difficulty in machining accurate shapes
Solution Approach 1:
The invention segments the continuous eccentric movement into discrete roller elements that move independently in guide grooves. This segmentation transforms the complex continuous motion into simpler discrete roller rotations, making the guide grooves easier to machine with standard tools while achieving the same speed reduction effect through the coordinated motion of multiple rollers.
Solution Approach 2:
Instead of creating complex eccentric shapes through difficult machining, the invention inverts the approach by using simple circular rollers that naturally fit into guide grooves. The guide grooves are designed to guide the rollers, rather than requiring the rollers themselves to have complex eccentric geometries, thereby simplifying the machining requirements.
3Productivity
If conventional reducers operate with high speed, then productivity is improved, but harmful factors worsen due to excessive noise and vibrations
Solution Approach 1:
The invention incorporates damping elements and carefully designs the roller-guide groove interaction to cushion and absorb vibrations before they propagate through the system. The guide grooves are designed to maintain continuous contact between rollers and groove surfaces, providing inherent vibration damping that reduces noise and harmful vibrations even at high operational speeds.
Solution Approach 2:
The invention converts the potential harmful vibrations and impacts into beneficial continuous rolling contact. By designing the guide grooves to maintain constant engagement with the rollers, the system transforms what could be impact-loaded vibrations into smooth, continuous rolling motion, thereby reducing noise and vibrations while maintaining high-speed operation.
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 enhances durability, reduces noise and vibrations, and minimizes machining errors, allowing for simpler manufacturing and reduced sliding friction, thereby improving operational reliability and cost-effectiveness.
Implementation Method 1
elastic rings adapted to insert the output shaft thereinto, located on both axial sides of the output shaft gear, and to outwardly pressurize the rollers toward the driving surface
Implementation Method 2
the plurality of rollers is pressurized against the driving surface to thus pressurize the output shaft gear, so that the output shaft rotates
Data Source
AI summary
The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.