Dual Clutch Transmission Shift Device Actuator Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual clutch transmission systems in hybrid vehicles face increased costs and noise issues due to the need for multiple actuators, particularly solenoids, which are inefficient and noisy during shifting operations.
Innovation Solution
A shift device configuration that shares odd-stage and even-stage select mechanisms, using a single select motor and pair of shift motors to reduce the number of actuators required, replacing solenoid-driven actuators with motor-driven mechanisms to minimize noise and simplify the shift control mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If solenoid actuators are used for shift control in dual clutch transmission, then shifting automation is achieved, but noise is generated during solenoid operation
Solution Approach 1:
The patent replaces the solenoid actuator (electromagnetic system) with a motor actuator (mechanical system) for shift control. This substitution eliminates the impact noise generated by solenoid operation while maintaining automated shifting functionality. The motor-driven mechanism provides smooth, controlled movement without the sudden engagement characteristics of solenoids.
2Ease of operation
If four actuators (two solenoids and two motors) are configured for each combination of odd-stage and even-stage select and shift operations, then complete shift control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the select mechanisms for odd-stage and even-stage into a single shared mechanism. The select actuator simultaneously controls the select shaft to position both odd-stage and even-stage synchronizer forks, reducing the total actuator count from four to three while maintaining complete shift control capability.
Solution Approach 2:
The shared select mechanism is designed to perform multiple functions: it controls both odd-stage and even-stage synchronizer selection, and works in conjunction with individual shift mechanisms for each stage. This multi-functionality reduces redundancy while ensuring complete shift control.
3Ease of operation
If four actuators are used for shift control, then complete control coverage is achieved, but manufacturing cost increases
Solution Approach 1:
By combining the select mechanisms for odd and even stages into a single shared mechanism, the patent reduces the number of actuators from four to three. This merging directly reduces manufacturing costs while maintaining complete control coverage through the coordinated operation of the shared select mechanism and individual shift mechanisms.
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
The solution reduces noise and costs by using a single select motor and two shift motors to control shaft movements, simplifying the configuration and reducing the number of actuators from four to three, making it suitable for hybrid vehicles sensitive to noise and contributing to cost savings.
Implementation Method 1
a lead screw rotating by the select motor to provide a straight moving force to the select guide block
Implementation Method 2
The select finger may have an idle roller provided with an outer circumferential surface thereof to reduce a friction resistance with the guide groove
Data Source
AI summary
Disclosed herein is a shift device of a dual clutch transmission capable of simplifying a configuration of a shift control mechanism of the transmission and contributing to saving costs by sharing odd-stage and even-stage select mechanisms and individually including an odd-stage shift mechanism and an even-stage shift mechanism. The shift device of a dual clutch transmission includes: a select guide block (20) moving in a straight direction by a driving of the select motor (10); a pair of control shafts (50) and (60) each shaft moving in a select direction by the straight movement of the select guide block; and a pair of odd-stage and even-stage shift motors (30) and (40) each providing a shaft rotating force to the pair of control shafts (50) and (60) in a shift direction.