Double Clutch Gearbox Component Sharing

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Solution Overview

Problem

Existing gearbox designs for double clutch and single clutch transmissions require significant modifications and have complex structures, leading to increased component diversity and production costs, as well as larger axial sizes.

Innovation Solution

A gearbox design that maximizes common components between double clutch and single clutch transmissions by sharing gear wheels and secondary shafts, allowing for minimal modifications to convert between the two configurations, including the sharing of gears like first and reverse, and third and fifth gears, which reduces the number of distinct components and assembly costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional separate designs are used for double clutch and single clutch transmissions, then each transmission can be optimized for its specific function, but the number of different components increases and production costs increase

Engineering Contradiction:
Improvetransmission function optimizationVSAvoidcomponent diversity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a common gearbox base structure that can serve both double clutch and single clutch transmission configurations. The gearbox includes shared components such as the input shaft, output shaft, gear wheels (including first, third, fourth, fifth, and reverse gear), and clutch units that can function in both transmission types. This multi-functional design allows the same physical hardware to be used across different transmission variants, reducing component diversity while maintaining optimized performance for each specific transmission type through configuration rather than structural modification.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Quantity of substance

If traditional gearbox designs are used, then sufficient space is available for all gear components, but the axial size of the gearbox becomes large

Engineering Contradiction:
Improvenumber of gear componentsVSAvoidaxial size
Core Design Contradiction:
Quantity of substanceVSLength of stationary object

Solution Approach 1:

The patent applies merging by combining the gear trains for odd gears (first, third, fifth, reverse) and even gears (second, fourth, sixth) onto shared input and output shafts within a common gearbox housing. Specifically, the first input shaft carries gear wheels for first, third, fourth, fifth, and reverse gears, while the second input shaft carries gear wheels for second, fourth, and sixth gears. The output shafts similarly share final reduction pinions and driven gear wheels. This merged configuration allows multiple gear components to occupy the same axial space efficiently, reducing the overall axial size of the gearbox while accommodating all necessary gear components for both double clutch and single clutch transmissions.

Inventive Principle:
Principle #5Merging (Combining)

3Adaptability or versatility

If conversion between double clutch and single clutch versions is performed traditionally, then the transmission can be adapted to different configurations, but significant modifications and additional burdens are required

Engineering Contradiction:
Improvetransmission configuration flexibilityVSAvoidconversion complexity
Core Design Contradiction:
Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent applies dynamics by designing a flexible configuration system where the same physical gearbox can be dynamically reconfigured between double clutch and single clutch modes through selective engagement and control logic rather than physical modification. The gearbox includes clutch units (first and second friction clutches) that can be selectively activated or deactivated, and control systems that can route power flow differently depending on the desired transmission type. This dynamic reconfiguration capability allows the transmission to adapt between different configurations without requiring physical modifications, additional components, or complex conversion processes, thereby maintaining ease of manufacture while achieving high adaptability.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS7426880B2Gearbox for a double clutch transmission of a motor vehicle
Publication Date: 2008.09.23 CENTRO RICERCHE FIAT SCPA
  • US7426880B2 patent drawing
  • US7426880B2 patent drawing
  • US7426880B2 patent drawing

AI summary

The gearbox comprises: a first, inner input shaft which carries a first and a second driving gear wheel associated with odd gears and with a reverse gear; a second, outer input shaft which is disposed coaxially with the first and carries a third and a fourth driving gear wheel associated with even gears; a first output shaft which carries a first driven gear wheel meshing with the first driving gear wheel to form a first gear, a second driven gear wheel meshing with the second driving gear wheel to form a fifth gear and a third driven gear wheel meshing with the fourth driving gear wheel to form a sixth gear; and a second output shaft which carries a fourth driven gear wheel meshing with the first driven gear wheel to form the reverse gear, a fifth driven gear wheel meshing with the second driving gear wheel to form a third gear, a sixth driven gear wheel meshing with the third driving gear wheel to form a second gear and a seventh driven gear wheel meshing with the fourth driving gear wheel to form a fourth gear.