Universal Joint Cup Bearing Staking With Preformed Notches
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Solution Overview
Problem
The existing methods for assembling universal joints are complicated and time-consuming due to the need for precise staking operations to prevent cup bearings from falling out, which can lead to axial position displacement and variations in the staking portion formation.
Innovation Solution
A method involving the formation of notches on the outer surface of the coupling arm portion, allowing for the inward deformation of thin-walled portions to create staking portions, reducing the staking load and preventing cup bearing displacement, thereby simplifying the assembly process and shortening the assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a staking punch is pressed vigorously to form staking portions, then the staking portions can be formed effectively, but the coupling arm portion may be flexibly deformed and the axial position may be displaced
Solution Approach 1:
A groove is formed in advance at the position where the staking portion is to be formed. This preliminary action prepares the structure for staking, allowing the staking punch to form the staking portion without requiring vigorous pressing, thereby preventing flexible deformation of the coupling arm portion and axial position displacement while simplifying the staking operation
2Ease of operation
If the staking punch is pressed slowly, then the coupling arm portion is less likely to be deformed, but the cross-sectional area increases and plastic deformation becomes difficult
Solution Approach 1:
A groove is formed in advance at the position where the staking portion is to be formed. This preliminary groove reduces the cross-sectional area that needs to be deformed, enabling plastic deformation to occur easily even when the staking punch is pressed slowly, thus maintaining both operational stability and staking formation effectiveness
3Manufacturing precision
If multiple staking operations are performed one by one, then each staking portion can be formed carefully, but the assembling time becomes longer
Solution Approach 1:
Multiple grooves are formed in advance at different positions where staking portions are to be formed. This allows multiple staking operations to be performed simultaneously or in sequence without repeated groove formation, improving assembly speed while maintaining staking portion quality through the pre-prepared groove structure
4Reliability
If the staking portion formation position varies, then the cup bearing preload load becomes inconsistent, but achieving consistent positioning requires complex measures
Solution Approach 1:
A groove is formed in advance at the precise position where the staking portion is to be formed. This pre-defined groove position ensures consistent positioning of the staking portion, thereby maintaining consistent cup bearing preload load without requiring complex positioning measures or suppression mechanisms
Solution Approach 2:
The groove is formed locally at the specific position where the staking portion needs to be formed. This localized preparation ensures that the staking portion forms at the correct position with consistent geometry, maintaining reliable cup bearing preload without affecting other areas or requiring complex overall positioning systems
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 approach allows for the formation of staking portions that prevent cup bearing displacement without complicating the staking operation, reducing the assembly time and minimizing variations in the staking portion, thus enhancing the efficiency of the universal joint assembly.
Implementation Method 1
a thin-walled portion formed in a radially inner portion of the notch in the opening edge portion of the circular hole is plastically deformed inward in a radial direction to form a staking portion
Data Source
AI summary
After a cup bearing (13a) is incorporated into a circular hole (11c) of a coupling arm portion (10c) forming a yoke, a notch (25) having a V-shaped cross section is formed in a portion near the periphery of the circular hole (11c) on an outer side surface of the coupling arm portion (10c). Thereafter, a thin-walled portion (27) having a substantially trapezoidal cross section formed in a radially inner portion of the notch (25) in an opening edge portion of the circular hole (11c) is plastically deformed inward in a radial direction to form a staking portion (14a). Therefore, it is possible to achieve a method of assembling a joint cross type universal joint and a joint cross type universal joint which can form the staking portion for preventing the cup bearing from falling off without complicating the staking work.