Cycloidal Speed Reducer Bearing Preload Without Axial Growth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cycloidal speed reducers face difficulties in easy assembly and axial volume increase due to washer-based preload adjustment methods, which complicate the assembly process and increase the device's size.
Innovation Solution
A cycloidal speed reducer with a preload adjustment device featuring a preloading plate and an adjusting screw, where the adjusting screw is threadedly engaged in the output flange and applies preload to the second bearing, allowing for rapid and easy adjustment without increasing the axial volume, and includes anti-rotation mechanisms to prevent screw loosening and spinning of the preloading plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a washer is used to adjust the preload on the bearing, then the preload can be adjusted to eliminate gaps and increase rigidity, but the assembly difficulty increases and the axial volume increases
Solution Approach 1:
The invention extracts the preload adjustment function from the traditional washer-based system and integrates it directly into the bearing assembly structure. The adjusting screw is built into the bearing housing, allowing preload adjustment without requiring separate washers, thereby simplifying assembly while maintaining transmission accuracy.
Solution Approach 2:
The invention merges the preload adjustment mechanism with the bearing assembly by integrating the adjusting screw directly into the bearing housing structure. This combination eliminates the need for separate washers and reduces the number of components, making assembly easier while achieving the same preload adjustment objective.
2Reliability
If a washer is used to adjust the preload on the bearing, then the preload can be adjusted to eliminate gaps and increase rigidity, but the axial volume increases
Solution Approach 1:
The invention nests the adjusting screw mechanism within the existing bearing housing structure. The adjusting screw is positioned inside the bearing assembly space, utilizing the existing internal volume rather than adding external components. This nesting approach allows preload adjustment functionality without increasing the axial dimensions of the overall assembly.
Solution Approach 2:
The invention transitions from an axial adjustment approach (using washers that increase axial length) to a radial adjustment approach. The adjusting screw operates in a radial direction within the bearing housing, changing the dimension in which adjustment occurs and thereby avoiding axial volume increase while still achieving preload adjustment for transmission accuracy.
3Reliability
If a washer is used to adjust the preload on the bearing, then the preload can be adjusted to eliminate gaps and increase rigidity, but the manufacturing complexity increases
Solution Approach 1:
The invention combines the preload adjustment function with the bearing housing structure, integrating the adjusting screw mechanism into the existing manufacturing process. This merger eliminates the need to manufacture and assemble separate washers, reducing the total number of parts and simplifying the manufacturing process while maintaining the ability to adjust preload for transmission accuracy.
Solution Approach 2:
The bearing housing is designed to serve multiple functions: it houses the bearing, provides structural support, and incorporates the preload adjustment mechanism. This multi-functionality reduces the need for additional specialized components like washers, simplifying manufacturing while enabling precise preload adjustment for transmission accuracy.
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
Enables easy and rapid preload adjustment of the bearings, simplifies the assembly process, and maintains a compact axial structure by eliminating the need for washers, ensuring consistent transmission accuracy and reduced manufacturing complexity.
Implementation Method 1
The adjusting screw is threadedly engaged in the adjusting screw hole of the output flange
Implementation Method 2
By rotating the adjusting screw, the preloading plate is pushed against the second outer ring of the second bearing by the adjusting screw and thus apply a preload to the second bearing
Implementation Method 3
a first bearing having a first inner ring and a first outer ring, wherein the first inner ring is mounted around the input end of the rotating shaft
Implementation Method 4
The first outer ring has an outer peripheral surface abutted against the input flange; the second outer ring has an outer peripheral surface abutting against the output flange
Implementation Method 5
The Oldham's coupling is provided between the cycloidal disc and the input flange or the output flange
Implementation Method 6
The cycloidal disc is mounted eccentrically around and connected to the rotating shaft
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cycloidal speed reducer (10) includes an output flange (60), a rotating shaft (30), a bearing (70), and a preload adjustment device (90). The rotating shaft (30) has an output end (34) inserted into the output flange (60). The bearing (70) has an inner ring (71) provided around the output end (34) of the rotating shaft (30) and an outer ring (72) provided at the output flange (60). The preload adjustment device (90) has a preloading plate (91) and an adjusting screw (92). The preloading plate (91) is adjacent to the output end (34) of the rotating shaft (30) and abuts against the outer ring (72). The adjusting screw (92) is screwed through the output flange (60) and presses against the preloading plate (91). When the adjusting screw (92) is rotated, the preloading plate (91) is pushed against the outer ring (72), thereby applying a preload to the bearing (70).