Orbital Forging Bearing Layout for Large Swing-Angle Hub Crimping
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Solution Overview
Problem
Conventional orbital forging devices are large and costly due to the need for a thrust sliding bearing with a partially spherical sliding surface, and the size and cost increase when setting the swing angle of the molding die to 15 degrees or more, which is required to suppress deformation and machining load in forming crimped portions for hub unit bearings.
Innovation Solution
The orbital forging device uses a rolling bearing with axial and radial load support, preventing movement toward the frame, allowing a larger swing angle of 15 to 30 degrees without the need for a thrust sliding bearing, and includes a detachable bearing holder to adjust the inclination angle, reducing device size and manufacturing cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thrust sliding bearing with a partially spherical sliding surface is used to support the swinging shaft, then the device can maintain stability during orbital forging, but the device size and manufacturing cost increase significantly
Solution Approach 1:
The invention extracts and removes the thrust sliding bearing from the system. Instead of using a thrust sliding bearing with a partially spherical sliding surface to support the swinging shaft, the patent uses a simpler structure where the swinging shaft is supported by a bearing that only needs to support radial loads, thereby reducing device complexity and manufacturing cost while maintaining the necessary stability through the spherical seat mechanism
Solution Approach 2:
The invention applies spheroidality by introducing a spherical seat (convex spherical surface) that engages with a corresponding concave spherical surface on the frame. This spherical engagement provides the necessary stability and guidance for the swinging shaft during orbital forging operations, replacing the need for a complex thrust sliding bearing while maintaining reliability
2Manufacturing precision
If the swing angle of the molding die is set to 15 degrees or more to suppress deformation and machining load, then the manufacturing precision of crimped portions improves, but the device size increases due to the thrust sliding bearing requirements
Solution Approach 1:
By removing the thrust sliding bearing from the system, the invention eliminates the size constraint that previously limited the swing angle. This allows the molding die to be set at a swing angle of 15 degrees or more, which suppresses deformation of the inner ring and improves manufacturing precision of crimped portions without increasing device size
Solution Approach 2:
The spherical seat mechanism provides stable support for larger swing angles. The convex spherical surface on the swinging shaft engages with the concave spherical surface on the frame, allowing the molding die to swing at 15 degrees or more while maintaining stability and precision, thereby achieving better deformation suppression without requiring a larger device
3Stability of the object's composition
If a thrust sliding bearing is assembled to prevent movement of the swinging shaft, then axial position stability is maintained, but the device becomes more complex and expensive
Solution Approach 1:
The invention extracts and eliminates the thrust sliding bearing from the system. The axial position stability previously provided by the thrust sliding bearing is achieved through alternative means, specifically through the bearing arrangement that supports the swinging shaft and the spherical seat mechanism, thereby reducing manufacturing cost and device complexity while maintaining stability
Solution Approach 2:
The invention introduces a bearing as an intermediary element to support the swinging shaft. This bearing, combined with the spherical seat mechanism, provides the necessary axial position stability without requiring a thrust sliding bearing, thereby simplifying the device structure and reducing manufacturing cost
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 enables the formation of crimped portions with suppressed inner ring deformation and reduced machining load, resulting in a compact and cost-effective orbital forging device capable of manufacturing hub unit bearings efficiently.
Implementation Method 1
a rolling bearing (28) which supports, between an outer ring (29) and an inner ring (30), an axial load acting on the end section on the other side in the axial direction of the swinging shaft (13)
Implementation Method 2
the molding die (15) rotates around its center axis (β) based on the friction force that acts on the contact portion thereof with the inner end section in the axial direction of the cylindrical section (8)
Implementation Method 3
the inner end section in the axial direction of the cylindrical section (8) is plastically deformed outward in the radial direction so as to form a crimped portion (9)
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is construction which is able to downsize an orbital forging device comprising a spherical seat with shaft that swings and rotates with a molding die. The end section on the other side in the axial direction of the swinging shaft 13 is supported with respect to the driving mechanism 17 in a state where the movement toward one side in the axial direction (lower side) is prevented, and a member for preventing the swinging shaft 13 from moving toward the one side in the axial direction with respect to the frame 10 is not assembled in a section which is located between the convex spherical seat 14 and the driving mechanism 17 in the axial direction of the swinging shaft 13.