Opposite Thread Clearance Elimination Device for Vibration Control
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Solution Overview
Problem
Existing devices for eliminating clearance between two parts during assembly are inefficient and lack a simple design, leading to potential vibrations and noise issues due to loose connections.
Innovation Solution
A device comprising a cup-shaped body with a cavity and a bush with complementary threads, where a screw with specific thread orientations is used to lock a plate to the dashboard at a predefined distance from the vehicle body plate, ensuring stable assembly by utilizing opposite thread directions to prevent unscrewing of the main part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing devices for eliminating clearance are used, then assembly of two parts can be achieved, but the design becomes complex and assembly efficiency decreases
Solution Approach 1:
The invention merges the bush and the screw into a single integrated component. The bush is formed with an internal thread that directly engages with the screw thread, eliminating the need for separate threading operations and components. This integration simplifies the device design while maintaining the clearance-elimination function, directly resolving the contradiction between assembly stability and device complexity.
Solution Approach 2:
The screw serves multiple functions simultaneously: it acts as both the fastening element and the thread-forming tool. When the screw is inserted and tightened, its external thread automatically engages with the internal thread of the bush, providing both structural support and clearance elimination. This multi-functionality reduces the number of components needed while ensuring reliable assembly.
2Reliability
If existing clearance elimination devices are used, then connection can be achieved, but vibrations and noise occur due to loose connections
Solution Approach 1:
The bush is pre-installed in the first part with its opening facing the second part. This preliminary positioning ensures that when the screw is later inserted and tightened, the thread engagement occurs in a pre-prepared configuration that guarantees full thread contact. This preliminary action prevents any loose connection formation, thereby eliminating vibrations and noise while ensuring stable connection.
3Productivity
If traditional assembly methods are used, then parts can be connected, but clearance between parts causes assembly inefficiency
Solution Approach 1:
The invention replaces complex mechanical adjustment systems with a simple thread engagement mechanism. The screw thread automatically converts rotational motion into linear displacement, precisely positioning the second part at the correct distance from the first part. This mechanical substitution eliminates the need for manual clearance adjustment while maintaining high precision, thereby improving both assembly efficiency and manufacturing precision.
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 device achieves a stable and noise-free assembly of two plates at a precise distance, eliminating clearance and preventing vibrations, thereby ensuring a secure and efficient connection.
Implementation Method 1
a pin 26 protrudes from the outer surface of the bottom wall 14 of the cup-shaped body 12 and has, on its outer side surface, a second thread 28 having a direction opposite to that of the first thread 20
Implementation Method 2
The fourth thread 38 has a direction the same as that of the second thread 28
Data Source
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AI summary
The device comprises: a main part (10) which includes a cup-shaped body (12) formed by a bottom wall (14) and by a side wall (16) which define inside them a cavity (18) which opens outwards, the inner surface of the side wall (16) having a first thread (20) and the outer surface of the bottom wall (15) having, protruding therefrom, a pin (26) having on its outer side surface a second thread (28) with a direction opposite to that of the first thread (20); a bush (32) having a tubular body (34) with a third thread (36) on its outer surface and a fourth thread (38) on its inner surface, the fourth thread (38) having a direction the same as that of the second thread (28) and the third thread (36) complementing the first thread (20) so that the bush (32) can be at least partly screwed into the cavity (18) of the main body (10); and a screw (42) having a head (44) and a shank (46) with a fifth thread (48) complementing the fourth thread (38) so that the shank (46) of the screw (42) can be screwed inside the tubular body (34) of the bush (32).