Linear Roller Bearing Raceplate Thickness Optimization
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Solution Overview
Problem
Existing linear roller bearings face limitations in load-bearing capacity and rigidity due to the large cross-section of the raceplate, which restricts the size of the complementary groove and compromises rolling precision and alignment compensation.
Innovation Solution
The raceplate thickness is optimized to a range of 0.8 to 1.2 times the roller body diameter, and the length to diameter ratio is adjusted between 7.0 to 15.0, allowing for a smaller complementary groove and improved rigidity, while the contact face and clearance space ratios are tuned to enhance load-bearing capacity and reduce frictional fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the raceplate has a large cross section to ensure sufficient thickness, then the load-bearing capacity is improved, but the complementary groove size increases which reduces the rigidity of the linear bearing
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the raceplate to a specific range (0.8 to 1.2 times the roller body diameter) and adjusting the length to diameter ratio (7.0 to 15.0). This allows the raceplate to have sufficient load-bearing capacity while maintaining a reduced cross-section that enables a smaller complementary groove, thereby preserving the rigidity of the linear bearing.
2Strength
If the raceplate thickness is increased to improve load-bearing capacity, then strength is improved, but the complementary groove must be larger which compromises rolling precision
Solution Approach 1:
The patent resolves this contradiction by precisely defining the raceplate thickness parameter as 0.8 to 1.2 times the roller body diameter. This optimized parameter range ensures that the raceplate is thick enough to bear loads effectively while remaining thin enough to allow a compact complementary groove design, thereby maintaining high rolling precision without compromising strength.
3Manufacturing precision
If the raceplate cross section is reduced to improve rigidity, then manufacturing precision is improved, but the load-bearing capacity decreases
Solution Approach 1:
The patent applies parameter changes by setting the raceplate thickness to 0.8 to 1.2 times the roller body diameter and the length to diameter ratio between 7.0 and 15.0. These optimized parameters enable the raceplate to achieve a reduced cross-section that improves rigidity and allows a smaller complementary groove, while simultaneously maintaining sufficient load-bearing capacity through the optimized dimensional relationships.
4Strength
If the contact face ratio is increased to improve load-bearing capacity, then strength is improved, but the clearance space ratio must be adjusted which affects frictional fluctuations
Solution Approach 1:
The patent applies parameter changes by optimizing the contact face ratio and clearance space ratio as coordinated parameters. The contact face ratio is set between 0.8 and 2.7 times the roller body diameter for load-bearing capacity, while the clearance space ratio is adjusted to 2.2 to 3.7 times the roller body diameter. This coordinated parameter optimization ensures sufficient load-bearing capacity while maintaining appropriate clearance to minimize frictional fluctuations and improve reliability.
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 optimized design increases the rigidity and load-bearing capacity of the linear roller bearing, improves rolling precision, and reduces frictional fluctuations, enabling better alignment compensation without compromising load-bearing performance.
Implementation Method 1
the raceplate is curved in convex fashion in the middle portion of its back side, and as a result the raceplate can execute a rocking motion in the complementary groove of the primary bearing body, about an axis that is perpendicular to the longitudinal direction of the rail
Implementation Method 2
a guide carriage braced longitudinally movably on a guide rail in the axial direction thereof via roller bodies
Data Source
AI summary
A linear roller bearing includes a guide carriage braced longitudinally movably on a guide rail in the axial direction thereof via roller bodies; the guide rail has one bottom face, one top face, and two side faces, which join the bottom face and the top face and on each of which side faces at least one track for roller bodies is located; the guide carriage has two leg parts and one crosspiece joining the two leg parts, so as to embrace the guide rail in essentially a U shape, and at least one roller body race is located in each of the leg parts; and furthermore a roller body race has a load-accepting track, a return track, and curved tracks that join the two tracks, and the load-accepting track of the guide carriage is formed by a raceplate that is parallel to the axial direction of the guide rail and that rests partially on the guide carriage and is braced in rocking fashion about an axis that is approximately perpendicular to the axial direction of the guide rail. The ratio of the thickness of the raceplate to the diameter of the roller body is in a range of from 0.8 to 1.2, and preferably in a range of from 0.8 to 1.1.