Hybrid Manual Transmission One-Way Clutch to Prevent Engine Dragging
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Solution Overview
Problem
The complexity and increased manufacturing cost of hybrid vehicles due to the use of a hydraulic clutch releasing mechanism to prevent engine dragging in EV running states, as described in JP 2009-292314 A, necessitate a simpler structure to manage engine and motor transitions efficiently.
Innovation Solution
A hybrid vehicle design incorporating a driver-operated clutch connected to a manual transmission with a one-way clutch in a specific gear pair, allowing power transmission between the engine and motor generator, enabling seamless switching between engine and motor operation without the need for a hydraulic clutch actuator, thus simplifying the structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic clutch releasing mechanism is provided to prevent engine dragging in EV running state, then engine dragging is prevented, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex hydraulic clutch releasing mechanism from the system. Instead of using a hydraulic device with multiple components (oil reservoir, oil pump, pressure regulating valve, linear solenoid valve), the patent achieves the same function of preventing engine dragging through a simpler mechanical arrangement where the clutch remains engaged during EV running state while the one-way clutch selectively transmits or blocks power flow.
Solution Approach 2:
The one-way clutch automatically performs the function of preventing engine dragging without requiring an active control system. When the motor generator operates in EV running state, the one-way clutch automatically blocks reverse power flow from the motor generator to the engine through its inherent mechanical design, eliminating the need for external control mechanisms.
2Reliability
If a hydraulic clutch releasing mechanism is provided to prevent engine dragging in EV running state, then engine dragging is prevented, but manufacturing cost increases
Solution Approach 1:
The invention removes the expensive hydraulic clutch releasing mechanism from the system. By eliminating components such as the oil reservoir, oil pump, pressure regulating valve, and linear solenoid valve, the patent significantly reduces manufacturing costs while maintaining the essential function of preventing engine dragging during EV operation.
Solution Approach 2:
The patent replaces the expensive hydraulic control system with a simple, inexpensive one-way clutch mechanism. The one-way clutch is a passive mechanical component that can be manufactured at low cost and requires no complex control systems, sensors, or actuators, thereby dramatically reducing the overall manufacturing cost of the hybrid vehicle.
3Device complexity
If a one-way clutch is provided in a specific gear pair, then structure is simplified, but power transmission control flexibility is reduced
Solution Approach 1:
The one-way clutch acts as an intermediary element in the power transmission path between the motor generator and the engine. It selectively mediates power flow based on operating conditions: allowing power transmission in one direction while blocking it in the reverse direction. This passive mediation achieves the necessary power flow control without requiring complex active control systems.
Solution Approach 2:
The one-way clutch changes the power transmission parameter (directionality) automatically based on the operating state. During EV running state, it blocks reverse power flow; during engine running state, it allows forward power transmission. This automatic parameter change based on operational conditions maintains control flexibility without adding system complexity.
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 design effectively prevents engine dragging in EV running states without complicating the vehicle's structure, allows easy switching between engine and motor modes, and enhances fuel efficiency by utilizing the motor generator for low-load operations, promoting quiet and efficient cruising.
Implementation Method 1
a one-way clutch transmitting power in one direction from the input shaft to the counter shaft is provided in one gear of a specific gear pair of the plurality of gear pairs
Data Source
Figure 1
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AI summary
[Object] Provided is a hybrid vehicle capable of preventing an engine from dragging in an EV running state without complicating a structure of a hybrid vehicle in which an engine and a manual transmission are connected through a clutch operated by a driver. [Solution] In a hybrid vehicle 1, a manual transmission 10 includes an input shaft 11 receiving power of an engine 2, a counter shaft 12 disposed in parallel to the input shaft 11, and a plurality of gear pairs 10A to 10F changing a rotation speed of the input shaft 11 and transmitting the rotation speed to the counter shaft 12. A motor generator 8 is connected to a power transmission path between the counter shaft 12 and a drive wheel 7 so that driving power is able to be transmitted and a one-way clutch 18 transmitting power in one direction from the input shaft 11 to the counter shaft 12 is provided in an input gear 11E which is one gear of a specific gear pair 10E of the plurality of gear pairs 10A to 10F. The input gear 11E is provided in the input shaft 11.