Gearbox Parking Gear Axial Nesting Between Bearing and Reverse Wheel

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing gear change devices for motor vehicles lack flexibility in component positioning, making them less adaptable to varying available spaces and potentially complicating the design from a construction standpoint.

Innovation Solution

The parking gear wheel is mounted adjacent to a roller bearing that supports the first secondary shaft, axially positioned between the parking gear wheel and the first reverse gear wheel, allowing for greater flexibility in arranging gearbox components and the lock device according to available spaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the parking gear wheel is mounted in a conventional position, then the gear change device structure is fixed and less adaptable, but the design complexity increases due to limited positioning options

Engineering Contradiction:

Improveflexibility of component positioningVSAvoiddesign complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The parking gear wheel is positioned in the axial direction between the first reverse gear wheel and the roller bearing, utilizing the axial dimension of the first secondary shaft. This dimensional approach allows flexible positioning along the shaft's length, adapting to available spaces without increasing radial or longitudinal complexity of the gear train arrangement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The roller bearing serving the first secondary shaft is given a dual function: it continues to support the shaft rotationally while also serving as an axial positioning reference for the parking gear wheel. This multi-functionality reduces the need for additional positioning structures, simplifying the overall design while enhancing positioning flexibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Area of stationary object

If the parking gear wheel is positioned away from the roller bearing, then component arrangement flexibility is reduced, but the available space for lock device positioning is limited

Engineering Contradiction:

Improveavailable space for lock deviceVSAvoidarrangement flexibility

Core Design Contradiction:

Area of stationary objectVSAdaptability or versatility

Solution Approach 1:

The parking gear wheel is nested axially within the space defined by the first reverse gear wheel and the roller bearing on the first secondary shaft. This nesting arrangement efficiently utilizes the axial length of the shaft, creating compact positioning that maximizes available space for the lock device while maintaining flexibility in the overall gear change device layout.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS8978499B2Gear change device for a motor vehicle

Publication Date: 2015.03.17 CENTRO RICERCHE FIAT SCPA

AI summary

A gear change device includes a first and a second primary shaft, selectively connectable to the driving shaft of a motor vehicle, and first second secondary shafts, The device includes pairs of gear wheels, corresponding to forward gear ratios and to at least one reverse gear ratio. The reverse gear ratio is defined by a first reverse gear wheel mounted freely rotatable on the first secondary shaft and connectable in rotation with the latter by one of the selector devices. A parking gear wheel is rigidly mounted on the first secondary shaft The parking gear wheel is mounted adjacent to a roller bearing which rotatably supports the first secondary shaft within the casing and which is axially interposed between the parking gear wheel and the first reverse gear wheel.