Motor Device Bolt Looseness Detection Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Looseness of bolts in motor devices used in industrial settings, such as machine tools and robots, leads to vibration and reduced efficiency in transmitting rotation torque, as existing technologies do not effectively detect or prevent bolt looseness.
Innovation Solution
A motor device equipped with a looseness detection sensor, such as a microswitch, pressure sensor, vibration sensor, or strain gauge, adjacent to the bolt, which detects variations in the bolt's position, axial force, or strain, and outputs a signal to a control unit to alert operators of looseness, allowing for timely adjustments to prevent torque transmission issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt is coated with an anti-loose agent, then the looseness prevention is improved, but it is difficult to completely prevent the looseness due to variation in applied amount
Solution Approach 1:
The patent applies anti-loose agent to the bolt before installation, performing the protective action in advance. This preliminary application ensures the bolt has initial protection against loosening, though the effectiveness varies due to manual application inconsistencies.
Solution Approach 2:
The patent introduces a sensor that detects bolt looseness in real-time and provides feedback to the control unit. This feedback mechanism allows the system to monitor the bolt's tightness status and trigger alerts or corrective actions when loosening is detected, compensating for the imperfect initial protection.
2Difficulty of detecting and measuring
If looseness detection sensor is added to detect bolt looseness, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical monitoring systems with simpler sensor-based detection. Instead of using elaborate mechanical linkages or manual inspection mechanisms, the invention uses electronic sensors (such as displacement sensors or strain gauges) to detect bolt looseness, simplifying the overall system while improving detection capability.
Solution Approach 2:
The sensor system automatically monitors the bolt's tightness status without requiring external intervention or complex mechanical assistance. The system serves itself by using the bolt's own physical state (position, strain, or vibration characteristics) as the detection target, eliminating the need for additional complex monitoring infrastructure.
3Stability of the object's composition
If the motor is fixed securely with a bolt, then the stability is improved, but the bolt may occur looseness due to repeated torque and vibration
Solution Approach 1:
The anti-loose agent is applied to the bolt before installation to provide preliminary protection against loosening. This pre-treatment creates an initial barrier that helps maintain bolt tightness under the expected torque and vibration conditions during motor operation.
Solution Approach 2:
The sensor continuously monitors the bolt's tightness status and provides real-time feedback to the control unit. When the sensor detects changes indicating loosening (such as displacement or vibration pattern changes), the system can alert operators or trigger corrective actions, ensuring the stability is maintained throughout the motor's operational life despite repeated torque and vibration.
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
Enables early detection and prevention of bolt looseness, ensuring efficient torque transmission by alerting operators to take corrective actions like tightening or replacing the bolt, thereby maintaining stable motor attachment and preventing large displacements or rattles.
Implementation Method 1
the looseness detection sensor is formed with a microswitch (for example, a microswitch 31 which will be described later), and detects that the fixing portion is separated from the fixing surface by the occurrence of looseness of at least one of the bolts so as to output the signal
Implementation Method 2
the looseness detection sensor is formed with a pressure sensor (for example, a pressure sensor 32 which will be described later), and detects a variation in the axial force of the bolt caused by the occurrence of looseness of at least one of the bolts so as to output the signal
Implementation Method 3
the looseness detection sensor is formed with a vibration sensor (for example, a vibration sensor 33 which will be described later), and detects a vibration of the fixing portion caused by the occurrence of looseness of at least one of the bolts so as to output the signal
Implementation Method 4
the looseness detection sensor is formed with a strain gauge (for example, a strain gauge 34 which will be described later), and detects a variation in the strain of the fixing portion caused by the occurrence of looseness of at least one of the bolts so as to output the signal
Data Source
AI summary
A motor device includes: a motor which includes a fixing portion for fixing to a fixing surface with a bolt; a looseness detection sensor which is provided in the fixing portion so as to be adjacent to at least one of the bolts; and a control unit which detects the occurrence of looseness of at least one of the bolts based on a signal output from the looseness detection sensor, and the looseness detection sensor may be formed with any one of a microswitch, a pressure sensor, a vibration sensor and a strain gauge.