Bearing Device Locking Part Radial Bulge Design
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Solution Overview
Problem
Existing bearing devices, such as roller lifters for internal combustion engines, suffer from uneven load distribution leading to accelerated fatigue and reduced service life, along with potential deformation of supporting parts due to swaging forces.
Innovation Solution
A bearing device featuring a shaft member with a locking part that bulges radially outward to lock onto the bearing hole's peripheral surface, allowing for rotatable support and preventing deformation, while the manufacturing method involves forming this locking part through an upsetting process to adjust the bulge amount and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pivot pin is swaged to be firmly fixed in the supporting parts, then the pivot pin is securely retained in position, but the supporting parts may deform due to the swaging force and the load distribution becomes uneven
Solution Approach 1:
The locking part is divided into a shaft portion (inserted into bearing hole) and a protruding end portion (extending axially). This segmentation allows the shaft portion to provide stable positioning while the protruding end can be deformed independently for locking without transmitting excessive force to the supporting parts, thus preventing deformation while maintaining position stability.
Solution Approach 2:
The locking part transitions from a rigid fixed structure to a dynamically deformable structure. The protruding end portion is designed to be deformable, allowing it to be pressed radially inward during assembly and then spring back to lock against the inner peripheral surface of the bearing hole, providing secure retention without requiring high swaging forces that could deform the supporting parts.
2Stability of the object's composition
If the pivot pin is firmly fixed to the supporting parts, then positioning is secure, but the load area becomes unevenly distributed accelerating fatigue
Solution Approach 1:
The locking part is segmented into a shaft portion for load bearing and a protruding end portion for locking. This allows the shaft portion to rotate freely within the bearing hole with uniform load distribution, while the protruding end provides positional stability through radial locking, separating the functions to prevent fatigue acceleration.
Solution Approach 2:
Different portions of the locking part have different mechanical properties. The shaft portion maintains a cylindrical shape for uniform rotational contact and load distribution, while the protruding end portion is designed to be deformable for locking. This local differentiation ensures reliable positioning without concentrating stress that would accelerate fatigue.
3Stability of the object's composition
If a traditional swaging process is used to fix the pivot pin, then the pin is retained securely, but the manufacturing process is complex and may cause deformation
Solution Approach 1:
The locking part is designed with dynamic deformability, allowing it to be easily deformed during a simple pressing operation rather than requiring complex swaging. The protruding end portion can be radially compressed and then springs back to lock, achieving secure retention through a simpler, more controllable manufacturing process that reduces the risk of deformation.
Solution Approach 2:
The locking part's cross-sectional area is changed during assembly by radially compressing the protruding end portion. This parameter change (reducing cross-section during pressing, then recovering) enables the locking function through a simple area-change deformation rather than complex swaging, simplifying the manufacturing process while ensuring secure retention.
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 design enhances the service life of the bearing device by distributing load more evenly and preventing deformation of the supporting parts, while simplifying the manufacturing process and ensuring secure locking.
Implementation Method 1
The locking part is deformed by force applied to an axial protruding end in the axial direction of the shaft member so as to bulge outward in a radial direction intersecting the axial direction
Data Source
AI summary
A bearing device includes a support having a bearing hole, a shaft member slidably inserted into the bearing hole thereby to be rotatably supported by the support, the shaft member having an axial end surface and a locking part located on the axial end surface of the shaft member to protrude in an axial direction of the shaft member from an outer periphery of the axial end surface of the shaft member. The locking part is deformed by force applied to its axial protruding end so as to bulge outward in a radial direction intersecting the axial direction, so that the bulging part is capable of being locked to a peripheral part of the bearing hole on an outer surface of the support.