Parking Lock Device Gap Mechanism Manual Operation
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Solution Overview
Problem
Conventional parking lock devices require a clutch to separate power transmission between the actuator and the mechanism part, leading to an increase in the number of parts.
Innovation Solution
A parking lock device with an electric motor and a mechanism that includes a first mechanism part to switch the parking gear between locked and unlocked states using the electric motor's output, and a second mechanism part to switch states manually, with a gap formed between the electric motor and the second mechanism part to reduce operation force without using a clutch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clutch is used to separate power transmission between the actuator and the mechanism part, then the operation force required for manual switching is reduced, but the number of parts increases
Solution Approach 1:
The patent extracts the clutch component from the system and replaces it with a gap mechanism. By creating a gap between the output member and the movable member, the system achieves automatic power transmission separation without requiring a clutch, thus reducing the number of parts while maintaining ease of operation
Solution Approach 2:
The gap acts as an intermediary mechanism that mediates between the output member and the movable member. When the gap exists, power transmission is automatically separated; when the gap is closed, power transmission is reestablished. This intermediary approach eliminates the need for a clutch while achieving the same functional effect
2Ease of operation
If a clutch is used to separate power transmission, then manual operation force is reduced, but the device structure becomes more complex
Solution Approach 1:
The clutch component is extracted from the system and replaced with a simpler gap mechanism. The gap is formed by the relative positioning of the output member and movable member, eliminating complex clutch structure while maintaining the ability to reduce manual operation force through automatic power transmission separation
Solution Approach 2:
The patent changes the structural parameter by introducing a gap distance between components. This parameter change enables automatic power transmission separation based on the presence or absence of the gap, achieving the same effect as a clutch but with simpler structure
Data Source
AI summary
A parking lock device includes: an electric motor; and a mechanism including a lock member configured to detachably engage with a parking gear and operate based on output from the electric motor. The mechanism includes a first mechanism part configured to switch a state of the parking gear between a locked state and an unlocked state by moving the lock member based on output from the electric motor, and a second mechanism part configured to switch a state of the parking gear from a locked state to an unlocked state by moving the lock member based on an external input generated manually. When the parking gear is in a locked state, in the first mechanism part, a relation between the second mechanism part and the electric motor is switchable between connection and disconnection with the second mechanism part on the basis of an output from the electric motor.