Bonnet Latch Antirattle Mechanism for Stability
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Solution Overview
Problem
Conventional bonnet latch devices face design issues such as rattling and disengagement between the latch and ratchet, which affect the stability and reliability of the bonnet closure mechanism.
Innovation Solution
A bonnet latch device featuring a main latch, ratchet, and antirattle latch mechanism, where the antirattle latch is energized by springs to push the striker in the unlatching direction and includes a U-shaped wall configuration to engage and reinforce the striker, preventing rattling and displacement, and is axially supported on the same shaft as the main latch to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the engaging groove of the latch is formed slightly wider than the diameter of the striker to ensure smooth engagement, then the ease of operation is improved, but the stability of the engaged state deteriorates due to increased gap and rattling
Solution Approach 1:
A pressing lever is introduced as an intermediary component between the striker and the latch. This lever presses the striker against the latch to eliminate gaps and prevent rattling, while still allowing smooth engagement through the wider groove design
2Reliability
If the ratchet is placed between a base plate and a cover plate to prevent shifting, then the reliability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The base plate and cover plate are merged into a single integrated base plate structure. The pressing lever is axially supported on the same shaft as the latch, combining multiple functions into fewer components while maintaining reliability
3Stability of the object's composition
If a pressing lever is added to push the striker against the latch to eliminate gaps, then the stability of the engaged state is improved, but the device complexity increases
Solution Approach 1:
The pressing lever is designed to perform multiple functions: it presses the striker against the latch to eliminate gaps, prevents rattling, and is axially supported on the same shaft as the latch, combining several functions into a single component
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
The solution effectively suppresses rattling and deformation, ensuring a strong and balanced bonnet latch mechanism that maintains the engaged state securely, enhancing the overall reliability and stability of the bonnet closure.
Implementation Method 1
an antirattle latch 22 that is energized by spring 23, 24 to push striker 12 engaged main latch 21 in an unlatching direction
Data Source
Figure 1
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AI summary
[The Technical Field] The present invention relates to a latch device of a bonnet (engine cover), that is, to a bonnet latch device. In particular, the invention relates to a bonnet latch device having improved strength. [The Summary of the Disclosure] A bonnet latch device that engages a striker attached to a bonnet and closes the bonnet, the bonnet latch device including: a main latch that is attached to a vehicle body, rotates from an unlatched position to a latched position around a latch shaft, and engages the striker; a ratchet that is axially supported on a ratchet shaft, engages the main latch rotated from the unlatched position to the latched position, and holds the main latch to the latched position; and an antirattle latch that is energized by a spring to push the striker that engages the main latch in an unlatching direction, in which a ratchet retainer that overlaps the ratchet in a direction of a shaft center of the ratchet shaft is provided in the antirattle latch.