Hub Nut Axial Securing and Sealing in Planetary Transmission

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Solution Overview

Problem

Current planetary transmissions require a large number of complex processing steps due to various rotation seals and additional securing elements, leading to increased costs and potential assembly errors.

Innovation Solution

A hub nut that integrates axial securing, rotation seal reception, and thread coating for sealing, eliminating the need for additional static sealing and securing elements, thus simplifying the assembly process and reducing parts and processing steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional static sealing elements (O-rings) and securing elements (cylindrical pins, adhesives) are used on the annulus, then sealing and securing functions are achieved, but device complexity and processing steps increase

Engineering Contradiction:

Improvesealing and securing functionVSAvoidnumber of parts and processing steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The hub nut combines multiple functions (axial securing of main bearing unit, rotation seal reception, thread coating for securing against unscrewing and sealing) into a single component, eliminating the need for separate O-rings, cylindrical pins, and adhesives that were previously required

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The hub nut serves multiple purposes simultaneously: it axially secures the main bearing unit, receives the rotation seal, and provides thread coating for both securing against unscrewing and sealing, making it a multi-functional component that replaces several separate parts

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If additional design elements (grooves, holes) are added to the annulus for sealing and securing, then sealing and securing functions are achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvesealing and securing functionVSAvoidprocessing steps in annulus

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing and securing functions are extracted from the annulus structure and transferred to the hub nut component. The annulus no longer requires grooves for O-rings or holes for cylindrical pins, as these functions are now performed by the hub nut itself

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The hub nut integrates the sealing and securing functions that were previously distributed across multiple separate elements and annulus modifications, consolidating them into a single component that attaches to the existing annulus without requiring additional design elements

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If adhesive dosing and application are used for securing main bearing, then securing function is achieved, but cleanliness problems and assembly errors occur

Engineering Contradiction:

Improvesecuring functionVSAvoidcleanliness issues and assembly errors

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The chemical adhesive application process is replaced with a mechanical thread coating system on the hub nut. The thread coating provides securing against unscrewing through mechanical engagement rather than chemical bonding, eliminating dosing problems and cleanliness issues associated with adhesive application

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9121488B2Hub nut for a planetary transmission and planetary transmission

Publication Date: 2015.09.01 ROBERT BOSCH GMBH

AI summary

A hub nut for a planetary transmission has a body configured to secure against unscrewing and to seal the planetary transmission.