Bearing Arrangement for Pinion Shaft Load Absorption
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Solution Overview
Problem
Conventional bearing arrangements for pinion shafts in transmission housings, such as those using tapered roller bearings, face challenges in effectively absorbing axial and transverse forces, bending forces, and temperature expansions, leading to increased shaft deflection and bearing friction.
Innovation Solution
A bearing arrangement featuring two axial needle bearings and a radial needle bearing, with compensation elements like spring elements for temperature stability, and a radial/axial needle bearing combination, which provides improved load absorption and reduced deflection while maintaining a compact design and low friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If tapered roller bearings are used to support the pinion shaft, then axial and radial forces can be absorbed, but shaft deflection increases and bearing friction increases
Solution Approach 1:
The bearing arrangement is segmented into three distinct bearing units: two axial needle bearings positioned on opposite sides of the pinion shaft and one radial needle bearing positioned between them. This segmentation allows each bearing to specialize in handling specific force components, optimizing performance while reducing overall deflection and friction compared to using tapered roller bearings as a single unit.
2Reliability
If conventional bearing arrangements are used, then the pinion shaft can be supported, but temperature expansions are not compensated leading to increased friction
Solution Approach 1:
The invention introduces a compensation element in the form of a spring that actively adjusts the preloading force on the radial needle bearing based on temperature changes. As temperature increases, the spring compresses or extends to maintain optimal preloading, compensating for thermal expansion of the pinion shaft and preventing excessive friction and bearing damage.
3Strength
If the bearing arrangement is designed to absorb higher bending moments, then load capacity increases, but device complexity increases
Solution Approach 1:
The invention merges the functions of axial and radial bearing support into a compact arrangement where two axial needle bearings and one radial needle bearing work together in close proximity. This combination allows the bearing arrangement to handle complex loading conditions including high bending moments, axial forces, and radial forces simultaneously, while maintaining a space-efficient design that does not significantly increase overall complexity.
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 proposed bearing arrangement effectively absorbs higher bending moments and axial forces, reduces shaft deflection, and maintains temperature-independent prestress, resulting in a more efficient and compact bearing solution with reduced operational friction.
Implementation Method 1
At least one of the axial bearings has a compensation element which is configured as a spring element, which acts between the bearing and the housing, and which serves to compensate for temperature expansions
Implementation Method 2
The radial bearing is preferably configured as a needle bearing. At least one of the axial bearings is also preferably configured as a needle bearing
Data Source
AI summary
A bearing arrangement for rotatably supporting a pinion shaft in a housing is described. A pinion of the pinion shaft interacting with a ring gear, the pinion shaft being mounted in the housing by way of two axial bearings and a radial bearing which is arranged between the axial bearings.