Pivot Cradle Bearing Rivet Retention for Removable Inner Shells
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Solution Overview
Problem
Existing pivot cradle bearings face challenges in securely attaching the inner bearing shell to the pivoting element while allowing for easy removal without damage, especially under high force applications, and require improvements in production methods.
Innovation Solution
A pivot cradle bearing design that uses rivets to form-fittingly secure the inner bearing shell to the pivoting element, allowing for secure retention and easy removal, with the rivets being preferably steel or other alloys, and a method involving bores in the inner bearing shell for rivet insertion, enabling elastic deformation for secure positioning and rotation prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner bearing shell is securely attached to the pivoting element under high force applications, then the retention stability is improved, but the ease of removal deteriorates
Solution Approach 1:
The connection system is segmented into removable rivets that can be individually detached. The inner bearing shell is divided into segments connected by rivets, allowing selective removal of individual rivets to enable disassembly while maintaining secure connection during operation.
Solution Approach 2:
Rivets are pre-installed in a disassembled state, and the inner bearing shell is elastically deformed in advance to accommodate the rivets. This preliminary elastic deformation allows for easy assembly and disassembly while ensuring secure retention during operation.
2Strength
If the inner bearing shell is securely attached to prevent rotation and displacement, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into the rivet component: it provides rotational prevention, displacement prevention, and secure retention all through a single simple element. The rivet combines the functions of a fastener, a positional constraint, and a retention mechanism.
Solution Approach 2:
The elastic deformation of the inner bearing shell serves the dual purpose of both securing the rivets in place and providing a self-aligning mechanism that ensures proper positioning without additional alignment features or complex adjustment mechanisms.
3Reliability
If rivets are used to form-fittingly secure the inner bearing shell, then the retention stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The manufacturing process utilizes parameter changes in the elastic properties of the inner bearing shell material. The shell is designed to undergo controlled elastic deformation during assembly, allowing rivets to be inserted and secured without complex forming operations or specialized manufacturing equipment.
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 solution provides a permanently stable retention of the inner bearing shell, preventing rotation and displacement, while allowing for easy assembly and disassembly without damage, even under high force conditions, and can be applied in hydraulic axial piston machines.
Implementation Method 1
The rivets are inserted into bores in the inner bearing shell, causing elastic deformation of the bearing shell material to secure the rivets in place
Data Source
AI summary
A pivot cradle bearing (1) having a pivoting element (2) which is mounted to pivot in a housing (3) is provided in which an inner bearing shell (7), on which rolling bodies (4) are rolling, is held on the pivoting element (2). The inner bearing shell (7) is held by rivets (10) in a form-fitting manner on the pivoting element (2) in the circumferential direction of the bearing shell (7).