Vehicle Power Transmission Device Using Screw Mechanism for Dual Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle power transmission devices require multiple sensors to achieve accurate control of torque adjustment and high-low switching mechanisms, leading to increased dimension and cost due to complex conversion mechanisms and separate systems for each operation.
Innovation Solution
A power transmission device utilizing a screw mechanism to convert rotational motion into linear motion, allowing for simultaneous control of the high-low switching mechanism and torque adjustment via a single motor and electronic control unit, reducing the need for multiple sensors and simplifying the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a drum cam system and ball-cam+lever system are used for switching operation and torque adjustment, then the conversion mechanism can convert motor rotation into linear motion, but the system complexity increases and requires multiple sensors for accurate control
Solution Approach 1:
The patent combines the high-low switching mechanism and torque adjustment mechanism into a single integrated system. Both functions share common components including the motor, screw mechanism, and rotation angle sensor, eliminating the need for separate sensor systems and reducing overall system complexity while maintaining control accuracy
Solution Approach 2:
The motor and rotation angle sensor serve dual purposes: controlling both the high-low switching operation and the torque adjustment operation. This multi-functionality reduces the number of required sensors and simplifies the control system architecture
2Measurement precision
If multiple sensors are used for detecting rotation angles of motor and actuator shaft, then accurate control of switching and torque adjustment is achieved, but system cost and dimension increase
Solution Approach 1:
The rotation angle sensor on the motor shaft serves both switching control and torque adjustment control functions. By using the motor's rotation angle for both purposes, the patent eliminates the need for a separate actuator shaft rotation angle sensor, reducing sensor count while maintaining measurement precision for both operations
Solution Approach 2:
The screw mechanism acts as an intermediary that translates motor rotation into linear motion for both the switching fork and clutch piston. This single transmission path allows one sensor to adequately control both functions through the common motion transfer mechanism
3Adaptability or versatility
If separate control systems are used for switching operation and torque adjustment, then each operation can be controlled independently, but the system dimension and cost increase
Solution Approach 1:
The patent merges the control systems by using a single motor and rotation angle sensor to control both switching and torque adjustment operations. The electronic control unit integrates both control functions, reducing system dimension while maintaining the ability to independently control each operation through coordinated motor rotation
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 configuration provides accurate and efficient switching operation and torque adjustment with reduced complexity and cost, avoiding the need for multiple sensors and minimizing system dimensions.
Implementation Method 1
a screw mechanism configured to convert a rotational motion of the motor into a linear motion
Data Source
AI summary
In a transfer, a high thrust can be given to a front-wheel driving clutch by a high magnification function of a screw mechanism. Further, a necessary stroke for an operation of a high-low switching mechanism can be obtained by the screw mechanism. Accordingly, with the use of one motor, the screw mechanism, and a transmission mechanism, it is possible to perform a switching operation of the high-low switching mechanism and a torque adjustment of the front-wheel driving clutch by the same system. Hereby, it is possible to perform, with accuracy, the switching operation of the high-low switching mechanism and the torque adjustment of the front-wheel driving clutch, based on a motor rotation angle Am of one motor.