Angular Contact Roller Bearing Assembly With Integrated Rims
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Solution Overview
Problem
Existing methods for supporting crankshafts in motor-vehicle internal combustion engines, such as deep groove ball bearings and cylindrical roller bearings, face limitations in radial load capacity and production costs, with angular contact roller bearings having issues with rim security and high production costs due to separate rim disks and complex machining.
Innovation Solution
A single-row angular contact roller bearing is assembled using a method where the races are machined conically and the rims are formed in one piece with the bearing rings, allowing for a higher load capacity and lower production costs through an eccentric-pivoting assembly method and the use of a prong-type cage and elastomer sealing washers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If deep groove ball bearings are used to support the crankshaft, then the bearing achieves high rotational speed limits and low friction, but the radial load capacity is limited due to the low maximum number of bearing balls that can be installed
Solution Approach 1:
The patent changes the bearing type from deep groove ball bearing to angular contact roller bearing, altering the fundamental parameters of the bearing system. This includes changing from spherical rolling elements to cylindrical roller elements, and from radial contact to angular contact configuration, thereby simultaneously achieving high speed capability and enhanced radial load capacity
Solution Approach 2:
The patent segments the bearing into separate functional components: the bearing rings with conically machined races, the roller elements, the cage, and the separately produced rim. This segmentation allows each component to be optimized independently and assembled through the eccentric-pivoting method, resolving the contradiction between speed and load capacity
2Force
If cylindrical roller bearings of the NUP type are used to increase load capacity, then the bearing can absorb high radial loads and axial loads, but the production costs become very high due to the high proportion of machining involved in producing the races and machining the rims
Solution Approach 1:
The patent segments the rim from the bearing rings, producing the rim as a separate component that is inserted after bearing assembly. This eliminates the need for complex machining of rims on the bearing rings, significantly reducing production costs while maintaining the structural integrity and load-bearing capacity of the bearing
Solution Approach 2:
The patent performs the bearing assembly (including insertion of roller elements and cage) before inserting the rim. This preliminary assembly approach allows the bearing to be constructed with standard machining operations on the bearing rings, avoiding the need for expensive post-assembly rim machining that would be required in conventional cylindrical roller bearings
3Ease of manufacture
If separate rim disks are used in angular contact roller bearings to delimit the races, then the bearing can be assembled, but the production costs increase due to the additional component and the required precision manufacture of the contact surfaces
Solution Approach 1:
The patent merges the rim insertion step into the bearing assembly process by using the eccentric-pivoting method that creates space for the rim during the same operational sequence used to insert the roller elements and cage. This integration eliminates the need for separate precision manufacturing and assembly operations for the rim, reducing both component complexity and production complexity
4Force
If the number of bearing balls in deep groove ball bearings is increased to improve radial load capacity, then the load capacity increases, but feed openings must be created in the bearing rings which have disadvantages in practice
Solution Approach 1:
Instead of creating feed openings in the bearing rings to insert roller elements (as done in deep groove ball bearings with increased ball counts), the patent inverts the approach by using the eccentric-pivoting assembly method that utilizes the elasticity of the bearing rings to create insertion space dynamically during assembly, then restores the rings to their original concentric configuration, thereby maintaining bearing integrity without permanent openings
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 achieves a higher load capacity than deep groove ball bearings and lower production costs by eliminating the need for separate rim disks and simplifying the assembly process, positioning the angular contact roller bearing between the load capacity of deep groove ball and cylindrical roller bearings.
Implementation Method 1
which is flexible within its elastic limit and can therefore be deformed by the action of deformation forces
Implementation Method 2
causes the inner bearing ring to pivot about a horizontal axis, formed between its impact points on the roller bearing elements
Implementation Method 3
roller bearing elements that are arranged between the bearing rings, roll on the races
Data Source
AI summary
A method and device for fitting an angular contact roller bearing, including an inner bearing ring having an inner race arranged on the outer peripheral surface of the inner bearing ring and inclined with respect to the axis of rotation of the bearing, and a rim delimiting said race at the smallest diameter thereof, an outer bearing ring having an outer race arranged on the inner peripheral surface of the outer bearing ring and inclined with respect to the axis of rotation of the bearing, and a rim delimiting said race at the greatest diameter thereof, and also including a plurality of roller bearing elements arranged between the bearing rings and roll on the races and are held at uniform distances from one another in the circumferential direction by a bearing cage. The outer peripheral surface of the inner bearing ring and the inner peripheral surface of the outer bearing ring are in each case cylindrical and extend outside the races at least in some sections coaxially with respect to the axis of rotation of the bearing, and the races of both bearing rings are in each case integrated conically into the cylindrical peripheral surfaces, such that the rims which are produced and in each case delimit the races on one side are in each case formed in one piece with the bearing rings. The fitting of the angular contact roller bearing takes place according to an eccentric pivot fitting method the deep groove ball bearing eccentric fitting method.