Rotor Shaft Oil Cooling Nozzle Mounting for Precise Alignment

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Solution Overview

Problem

Existing coolant connection modules for electrical machines are costly and complex to produce, requiring additional stability and precise alignment of the fluid outlet nozzle within the hollow rotor shaft.

Innovation Solution

The coolant connection line module features a unique outlet mounting section that allows for reliable fixation and alignment of the fluid outlet nozzle, utilizing a latching connection and separate mounting sections for inlet and outlet nozzles, enabling the use of less expensive and less stable materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the coolant connection line module is designed with integrated mounting and nozzle functions, then the structure is simpler, but the alignment precision and reliability of the fluid outlet nozzle deteriorate

Engineering Contradiction:

Improvestructure simplicityVSAvoidalignment precision of fluid outlet nozzle

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The coolant connection line module is divided into separate functional components: the mounting section that attaches to the machine housing and the nozzle section that extends into the rotor shaft. This segmentation allows each component to be optimized independently - the mounting section provides stable attachment while the nozzle section ensures precise alignment and fluid delivery, resolving the contradiction between structural simplicity and alignment precision.

Inventive Principle:

Principle #1Segmentation

2Reliability

If stable and expensive materials are used for the coolant connection line module, then the reliability and stability improve, but the manufacturing cost increases

Engineering Contradiction:

Improvestability of coolant connection line moduleVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By segmenting the module into mounting and nozzle sections with distinct functions, the design allows the use of cost-effective materials for the mounting section while concentrating reliability requirements on the nozzle section. This reduces overall material costs while maintaining necessary stability and reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mounting section is designed to provide inherent stability and support for the nozzle section through its attachment structure. This self-supporting design reduces the need for expensive stabilizing materials throughout the entire module, as the mounting section effectively serves the nozzle section structurally.

Inventive Principle:

Principle #25Self-service

3Reliability

If the fluid outlet nozzle projects deeper into the rotor shaft, then the cooling effectiveness improves, but the alignment difficulty and manufacturing complexity increase

Engineering Contradiction:

Improvecooling effectivenessVSAvoidalignment difficulty

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Separating the mounting function from the nozzle function allows the nozzle to be designed as a distinct component that can be precisely aligned and attached after the mounting section is secured. This reduces alignment difficulty during assembly while maintaining the necessary projection depth for effective cooling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mounting section is attached to the machine housing first, establishing a stable reference framework. The nozzle section is then aligned and attached to this pre-positioned mounting section, making the alignment process simpler and more accurate compared to attempting to align and attach the entire integrated module simultaneously.

Inventive Principle:

Principle #10Preliminary action

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 design reduces production costs and complexity, allows for precise alignment of the fluid outlet nozzle, and enables the use of less expensive materials while ensuring reliable fixation and operation of the coolant connection module.

Implementation Method 1

a coolant channel (8) is provided in the coolant connection line module (5) between the fluid inlet nozzle (6) and the fluid outlet nozzle (7)

Methodology Applied

Scientific EffectFluid flow through channels:

Implementation Method 2

The outlet mounting section (10) has at least one latching element (10a) for establishing a latching connection

Methodology Applied

Scientific EffectMechanical latching connection: Mechanical Fastener

Implementation Method 3

The electrical machine has a rotor, wherein the rotor comprises a rotor shaft that is hollow at least in sections... for introducing coolant into the shaft

Methodology Applied

Scientific EffectConvection cooling: Convection

Data Source

PatentUS20250202317A1Electrical machine with oil cooling

Publication Date: 2025.06.19 ROBERT BOSCH GMBH

AI summary

An electrical machine includes a rotor with a rotor shaft that is hollow at least in sections, which is mounted on a machine housing and extends along an axial direction. A coolant connection line module has a fluid inlet nozzle and a fluid outlet nozzle, with the fluid inlet nozzle fluidically connected to a coolant channel of the machine housing. The fluid outlet nozzle projects in the axial direction into the hollow rotor shaft. The coolant connection line module has an outlet mounting section that is different from the fluid inlet nozzle and the fluid outlet nozzle and is arranged closer to the fluid outlet nozzle than to the fluid inlet nozzle, and is attached to the machine housing via the outlet mounting section at least in the axial direction.