Segment Rolling Bearing Cage Integration for Axial Pumps

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Solution Overview

Problem

Segment rolling bearings for axial hydraulic pumps face challenges in secure mounting due to the potential unsecured separation of outer and inner raceway carriers and the cage during operation, leading to uneven distribution and placement of rolling bodies.

Innovation Solution

A segment rolling bearing design where the cage is directly connected to both raceway carriers without intermediate elements, forming a mechanical coupling and ensuring captive attachment, with a synchronizing unit using a radially oriented control pin to maintain relative positioning and prevent unwanted movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cage is not directly connected to the raceway carriers, then the structure is simpler and easier to manufacture, but the components may separate uncontrollably during operation

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The cage is directly connected to both the inner and outer raceway carriers, merging the cage into the structural assembly of the bearing. This direct connection ensures that the cage remains securely positioned during operation, preventing uncontrolled separation of components while maintaining structural integrity throughout the pivoting movement range.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If intermediate elements are used to connect the cage to raceway carriers, then the mounting is more flexible, but the structural integrity is reduced

Engineering Contradiction:

Improvemounting flexibilityVSAvoidstructural integrity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

Intermediate connection elements are eliminated from the design. The cage is directly integrated with the raceway carriers through direct connection, removing the need for separate intermediate components. This extraction of intermediate elements simplifies the structure while ensuring direct, reliable connection that maintains structural integrity during operation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If the rolling bodies are not evenly distributed, then the pivoting movement is smoother, but the bearing performance deteriorates

Engineering Contradiction:

Improvepivoting smoothnessVSAvoidbearing performance

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The direct connection between the cage and raceway carriers enables the cage to dynamically follow the pivoting movement of the carriers throughout the entire angular range. This dynamic connection ensures that rolling bodies remain evenly distributed and properly guided during oscillating movement, maintaining both smooth pivoting operation and reliable bearing performance under varying load conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8998489B2Segment rolling bearing, and axial hydraulic pump having the segment rolling bearing

Publication Date: 2015.04.07 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

A segment rolling bearing for an axial hydraulic pump, which can be integrated in a simple way. The segment rolling bearing has an outer raceway carrier, an inner raceway carrier, a plurality of rolling bodies, and a cage. The rolling bodies are arranged in the cage such that they roll between the outer raceway carrier and the inner raceway carrier in such a way that the outer raceway carrier can be pivoted about a common pivot axis with respect to the inner raceway carrier. The cage is connected to the inner and/or to the outer raceway carrier directly and captively in at least one connecting region, at least in the radial direction with respect to the common pivot axis.