Seven-Speed Dual-Clutch Transmission With Simplified Reverse Gear Path

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Solution Overview

Problem

The existing seven-speed double clutch transmission has a complicated reverse gear transmission path and a large number of engaging gears, which hinders compactness and noise performance, increasing weight and cost, and affecting the miniaturization and driving comfort of vehicles.

Innovation Solution

The transmission design includes an outer and inner input shaft with specific gear arrangements, eliminating the need for a dedicated reverse gear shaft, using the 3-speed driving and driven gears, 2-speed driving gear, and first output shaft as transmission components for reverse gear transmission, simplifying the reverse gear path and reducing gear engagements, while maintaining smooth power delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a dedicated reverse gear shaft is arranged in existing seven-speed double clutch transmission, then reverse gear function is achieved, but transmission weight and cost increase

Engineering Contradiction:

Improvereverse gear functionVSAvoidtransmission weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent merges the reverse gear function with existing transmission components (3-speed driving gear, 2-speed driving gear, and first output shaft) to eliminate the dedicated reverse gear shaft. The reverse gear is integrated into the existing gear arrangement, combining multiple functions into fewer components, thereby reducing transmission weight while maintaining reverse gear capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The existing 3-speed driving gear, 2-speed driving gear, and first output shaft are designed to serve multiple purposes: forward gear transmission and reverse gear transmission. This multi-functionality eliminates the need for dedicated reverse gear components, reducing overall transmission weight and component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a dedicated reverse gear shaft is arranged in existing seven-speed double clutch transmission, then reverse gear function is achieved, but transmission cost increases

Engineering Contradiction:

Improvereverse gear functionVSAvoidtransmission cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines the reverse gear function with existing gear components, eliminating the need for a separate reverse gear shaft and associated supporting structures. This merging reduces the total number of parts that need to be manufactured, assembled, and quality-checked, thereby lowering production costs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the reverse gear shaft from the transmission system and replaces it with a simplified gear arrangement using existing components. This extraction removes unnecessary complexity and reduces manufacturing steps, leading to cost savings.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If low-speed gears are placed near the rear end of transmission, then gear arrangement is achieved, but transmission housing space requirement increases

Engineering Contradiction:

Improvegear arrangementVSAvoidtransmission housing space

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent reorganizes the gear arrangement by distributing gears across two parallel output shafts instead of concentrating all gears on a single shaft or location. This spatial redistribution optimizes the use of transmission housing space, reducing the required housing area while accommodating all necessary gears including low-speed gears.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent segments the gear arrangement into two parallel output shafts, with different gears distributed on each shaft. This segmentation allows for more efficient space utilization within the transmission housing, reducing the overall footprint required for the transmission system.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11293525B2Seven-speed double clutch transmission and vehicle

Publication Date: 2022.04.05 GUANGZHOU AUTOMOBILE GROUP CO LTD

AI summary

Provided are a seven-speed double clutch transmission and a vehicle. The seven-speed double clutch transmission includes: an outer input shaft and an inner input shaft, a 4/6-speed driving gear and a 2-speed driving gear are sequentially fixed on the outer input shaft, and a 1-speed driving gear, a 3-speed driving gear and a 5/7-speed driving gear are sequentially fixed on the inner input shaft; a first output shaft and a second output shaft, a 4-speed driven gear, a 2-speed driven gear, a 1-speed driven gear and a 5-speed driven gear, are sequentially fixed on the first output shaft, and a 6-speed driven gear, a reverse gear, a reverse gear synchronizer, a 3-speed driven gear and a 7-speed driven gear are sequentially fixed on the second output shaft.