Neutral State Lock Release Device for Transmission Parking
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Solution Overview
Problem
Conventional shift-by-wire transmission systems in vehicles suddenly shift to a parking stage when the engine is off while driving, leading to potential transmission damage and inability to change transmission conditions when the engine is intentionally stopped.
Innovation Solution
A neutral state maintaining lock and release device is introduced, utilizing a parking release cable, solenoid body, and sliding cam to maintain a gear neutral state until vehicle speed is reduced, and then release it, replacing the conventional hydraulic pressure cylinder to prevent transmission damage and vehicle overthrow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic pressure cylinder is used to control parking stage engagement, then the transmission can be shifted to parking stage when engine is off, but the transmission may be damaged when engine is unexpectedly off while vehicle is being driven
Solution Approach 1:
The patent removes the hydraulic pressure cylinder from the system and replaces it with a cable-driven mechanism. The parking release cable directly connects the control lever to the parking lever, eliminating the need for hydraulic components while maintaining the ability to engage and release the parking stage.
Solution Approach 2:
The patent introduces a neutral state maintaining lock and release device as an intermediary mechanism between the control lever and parking lever. This device includes a lock pin that can engage with a lock hole to maintain the neutral state, preventing sudden transmission damage while allowing controlled parking engagement when needed.
2Reliability
If hydraulic pressure cylinder is used for parking control, then parking stage can be engaged, but vehicle cost and weight increase
Solution Approach 1:
The patent eliminates the hydraulic pressure cylinder, which is a heavy component, from the parking control system. The replacement cable-driven mechanism with lock pin significantly reduces the weight of moving parts while maintaining reliable parking control functionality.
Solution Approach 2:
The patent replaces expensive hydraulic components with simpler, cheaper mechanical elements such as cables, springs, and lock pins. These simpler components achieve the same functional outcome at lower cost and weight.
3Reliability
If hydraulic pressure cylinder is used for parking control, then parking stage can be engaged, but device complexity and cost increase
Solution Approach 1:
The patent removes the complex hydraulic pressure cylinder system including solenoid apparatus and hydraulic fluid pathways, replacing it with a simple cable-driven mechanical system that is easier to manufacture, maintain, and understand.
Solution Approach 2:
The patent replaces the hydraulic-mechanical system with a purely mechanical cable-driven system. The parking release cable provides direct mechanical connection, and the spring-loaded lock pin mechanism provides automatic neutral state maintenance without requiring hydraulic pressure or electrical solenoids.
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
Prevents transmission damage and vehicle overthrow by maintaining a neutral state until vehicle speed is sufficiently reduced, reducing vehicle cost and weight by eliminating the need for hydraulic pressure cylinders.
Implementation Method 1
a detent return spring wound around an exterior circumference of the control shaft, supporting the parking lever, and providing elastic force to rotate the parking lever and return to an original position
Implementation Method 2
a solenoid body in which power is on or off and configured to move in a vertical direction with respect to the eye end
Data Source
AI summary
A transmission parking system is provided. The system includes a parking gear and a parking rod that is connected with the parking gear. Additionally, a parking lever has a first end that is connected with the parking rod and the parking lever is installed rotatably around a control shaft. A detent return spring is wound around an exterior circumference of the control shaft, supports the parking lever, and provides elastic force to rotate the parking lever and return to an original position. A control lever is installed rotatably around the control shaft and is installed at an exterior side of the parking lever to allow user operation. A neutral state maintaining lock and release device is connected with the control lever and is changed to a neutral state lock or a neutral state release based on operation of the control lever.