Bearing Holder Plate Spring Preload Axial Length
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Solution Overview
Problem
Conventional bearing preload structures, such as those using screws or coil springs, require significant axial space and multiple components, leading to increased device length and complexity.
Innovation Solution
A bearing holder with an integrally formed flange, holder body, and plate spring part that applies preload through the plate spring's elastic properties, eliminating the need for separate preload components and reducing axial installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a fixed-position preload structure incorporating a screw or the like is used, then a preload can be applied to the bearing, but the device requires screw-tightening clearance and has greater axial length
Solution Approach 1:
The bearing holder integrates multiple functions into a single component: the holder body part holds the bearing, the flange part provides mounting attachment, and the plate spring part applies preload. This merging eliminates the need for separate preload components and reduces axial length while maintaining effective preload functionality.
2Force
If a constant-pressure preload structure incorporating a coil spring is used, then a preload can be applied to the bearing, but the device requires space for installing preload-applying components and has greater axial length
Solution Approach 1:
The bearing holder combines the bearing holding function and preload application function into one integrally formed component. The plate spring part is directly formed as part of the bearing holder, eliminating the need for separate coil springs, wave washers, or disc springs, thereby reducing device complexity and component count.
Solution Approach 2:
The bearing holder serves multiple functions simultaneously: it holds the bearing through the holder body part, provides mounting attachment through the flange part, and applies preload through the plate spring part. This multi-functionality reduces the overall component count and simplifies the device structure.
3Force
If a constant-pressure preload structure incorporating a wave washer or disc spring is used, then a preload can be applied to the bearing, but the device requires installation space for these components and has greater axial length
Solution Approach 1:
The bearing holder integrates the preload application function directly into its structure through the plate spring part, eliminating the need for separate wave washers or disc springs. This integration significantly reduces the axial length required for preload application while maintaining effective preload force.
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 allows for a compact bearing mechanism with reduced axial length and fewer components, simplifying assembly and reducing manufacturing costs while maintaining effective preload functionality.
Implementation Method 1
the plate spring part has spring properties that enable the holder body part to be urged in a direction of a center axis thereof
Data Source
AI summary
In this hollow strain wave gearing unit, a shaft end part of a hollow rotary shaft of a wave generator is located inside a cup-shaped flexible external gear. The shaft end part is supported by a bearing attached to a bearing holder that is fixed to a boss of the flexible external gear. In the bearing holder, an elastic leaf spring part that is displaceable in the axial direction constitutes a part that supports a holder body part that holds the bearing. A preload is applied by the leaf spring part to the bearing in the axial direction. Thus, there is no need to separately arrange a preload application member inside the flexible external gear, and the axial length of the hollow strain wave gearing unit can be shortened.