Automotive Transmission Linear Drive Motor Shifting Feel
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Solution Overview
Problem
Conventional automotive transmissions require complex mechanical structures for shift manipulation feel, leading to potential shifting failures and safety concerns, especially when shifting between gear ranges like D, P, and R, and they often lack efficient weight and size optimization.
Innovation Solution
The design incorporates a linear drive motor with a unique configuration of magnets and coils, along with an asymmetric magnetization distribution, to provide a consistent propulsive force for improved shifting feel and safety, while reducing the transmission's weight and size by optimizing the thickness ratio of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical shifter detent device is used to provide shift manipulation feel, then the driver can recognize gear position changes, but the structure becomes complicated
Solution Approach 1:
The patent replaces the conventional mechanical shifter detent device with a linear drive motor that uses electromagnetic forces to provide shift manipulation feel. The linear drive motor generates propulsive force through electromagnetic interaction between coils and magnets, eliminating the need for complex mechanical detent mechanisms while still providing tactile feedback to the driver during gear shifting operations.
2Reliability
If conventional mechanical structures are used for shift blocking, then gear shifting safety is ensured, but the transmission weight and size increase
Solution Approach 1:
The linear drive motor serves multiple functions: it provides shift manipulation feel, enables gear position selection, and acts as a shift blocking device. By integrating these functions into a single electromagnetic actuator rather than using separate mechanical devices, the transmission achieves improved safety while reducing overall weight and size.
3Reliability
If the linear drive motor provides strong propulsive force, then shifting reliability improves, but the motor size increases
Solution Approach 1:
The patent optimizes the physical parameters of the linear drive motor components, specifically the thickness ratios of the head component and rear component. By carefully selecting and adjusting these dimensional parameters, the motor achieves the required propulsive force for reliable shifting while maintaining a compact size that fits within the transmission housing.
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 solution enhances the driver's tactile control during gear shifting, reduces shifting failures, and provides a constant propulsive force for safe gear position selection, while achieving a more compact and lightweight transmission.
Implementation Method 1
a linear drive motor configured to provide a reaction force against a force required to move the knob or a force required for the driver to manipulate the knob. The linear drive motor may include a rear component fixedly disposed within the housing and a head component that is movably disposed with respect to the rear component. Further a magnet may be disposed within one of the head component or the rear component. A coil may be disposed within the other of the head component and the rear component.
Data Source
AI summary
An automotive transmission, having a reduced weight and size improves a driver's manipulating feel in gear shifting, prevents shifting failure, and improves durability. The automotive transmission includes a housing, a knob manipulated by a driver, a lever that moves in linkage with the operation of the knob, and a linear drive motor that provides a reaction force. The linear drive motor includes a rear component disposed in the housing, a head component movably installed with respect to the rear component, a magnet disposed in the head component or the rear component and a coil disposed in the other component. The head component includes a sidewall having a portion that overlaps the rear component, and a cover that extends from one end of the sidewall to an interior side of the head component and a thickness greater than the thickness of the sidewall.