What are the common faults of gears?
Gears are familiar to everyone, and we often see them in our daily lives. Over time, gears can develop faults during use. Today, let's take a look at the common faults that can occur.
Release time:
2021-12-11 08:51
www.gdmotor.cn
1. Tooth Fracture
1) Fatigue Tooth Fracture: Due to the bending stress generated at the root of the gear under load, which is a pulsating cyclic alternating stress, and the combined effect of stress concentration sources such as the root fillet, machining tool marks, and material defects, fatigue cracks can occur. The cracks gradually propagate and eventually lead to fatigue tooth fracture.
2) Overload Tooth Fracture: For gears made of brittle materials such as cast iron or high-hardness alloy steel, severe overload or impact load can cause the stress at the dangerous section of the tooth root to exceed the limit, resulting in sudden tooth fracture.
3) Localized Tooth Fracture: When the machining accuracy of the tooth surface is low, or the quality of gear maintenance and installation is poor, a load imbalance phenomenon occurs along the tooth surface contact line, where one end is in contact while the other is not. This load imbalance significantly increases the stress at the tooth root of the locally contacting gear, exceeding the limit and resulting in localized tooth fracture. Localized tooth fractures always occur at the ends of the gear.
2. Pitting
1) Initial Pitting (also called Convergent Pitting): Usually occurs only on soft tooth surfaces (HB<350). After pitting occurs, it does not continue to develop and may even disappear. The reason is that the micro-protrusions gradually flatten, thereby expanding the contact area, and the contact stress decreases accordingly.
2) Expansive Pitting: Occurs on hard tooth surfaces (HB>350). After pitting occurs, due to the high brittleness of the tooth surface, the edges of the pits are not flattened but continue to fracture until the tooth surface is completely damaged.
For open gears, when fatigue cracks on the tooth surface have not yet formed or propagated, they are worn away, so there is no pitting. When hard tooth surface gears are improperly heat-treated, the tooth surface may sometimes flake off in pieces at the interface between the hardened layer and the core, which is called flaking.
3. Wear
Wear of the tooth surface is caused by the entry of metal particles, dust, and sand grains into the working surface of the teeth. Uneven tooth surfaces, poor lubrication, etc., are also causes of tooth surface wear. In addition, misalignment, coupling wear, and torsional resonance can cause significant torque variations at the gear meshing point or increase impacts, accelerating wear.
After gear wear, the thickness of the teeth decreases, the tooth profile deforms, and the backlash increases, which can lead to increased dynamic load on the gear, not only increasing vibration and noise but also likely causing tooth fracture.
4. Welding
Tooth surface welding (scratches) occurs when the oil film breaks during the relative sliding of meshing tooth surfaces, causing direct contact between the tooth surfaces. Under the action of friction and pressure, a momentary high temperature is generated in the contact area, resulting in localized fusion welding and adhesive damage to the metal surface.
Welding often occurs under conditions of excessively low oil viscosity, high operating temperatures, excessive unit area load on the tooth surface, excessively high relative sliding speed, too small contact area, and excessively low rotational speed (where the oil cannot be carried up). After welding occurs on the tooth surface, it accelerates the wear of the tooth surface, leading to rapid failure of the gear transmission.
Related News
What is the difference between brushless reduction motors and brushed reduction motors?
Brushless DC Motor (BLDC) and Brushed DC Motor have some significant differences in structure, working principle, performance, and other aspects. Here are their main differences:
How to assess the noise level and vibration characteristics of a screw-type window opener motor?
When selecting a screw-type window opener motor, its noise level and vibration characteristics are two crucial factors that directly affect the user experience and the stability of the equipment. So, how should we evaluate these two aspects?
In the field of construction, screw-type window openers are important devices for achieving automated window opening and closing, and their performance and stability are crucial. Especially in some harsh environmental conditions, such as high humidity and dusty places, the protection level of the motor becomes a key factor in ensuring the normal operation of the window opener.
What are the common faults of screw-type window opener motors?
The screw-type window opener motor may experience some common faults during long-term use. Below are some typical fault phenomena and their possible causes.
Introduction to Micro DC Gear Motors
Introduction to Micro DC Gear Motors Micro DC gear motors are a miniaturized motor system, typically consisting of a DC motor and a gearbox. Here are some related introductions to micro DC gear motors: DC Motor Section: Working Principle: The DC motor generates current by moving a conductive coil in a magnetic field, thus producing electromagnetic force to drive the motor's rotation. Structure: Micro DC motors usually adopt a separate structure, including an armature (rotating part) and an electromagnet (stator part). Types: Common types of DC motors include brushed DC motors and brushless DC motors. Brushed DC motors use brushes to connect to the armature, while brushless DC motors control current through an electronic speed controller, eliminating the need for brushes. Gearbox Section: Function: The gearbox is used to slow down the motor's output speed while increasing torque. This is crucial for applications requiring higher torque and lower speeds, such as robotic arms and camera gimbals. Structure: Gearboxes typically consist of gears that achieve the reduction ratio through different gear combinations. The reduction ratio is the ratio of input speed to output speed. Types: Common types of gearboxes include planetary gears, worm gears, and helical gears. Different types of gearboxes are suitable for different application scenarios. Applications: Micro DC gear motors are widely used in various fields, including consumer electronics (such as cameras and printers), medical devices, robotics, and automotive electronics. In these applications, micro DC gear motors are typically used to control precise movements, provide sufficient torque, and achieve efficient performance in limited spaces. Control and Drive: Micro DC gear motors usually require corresponding electronic speed controllers or controllers to precisely control rotation speed and direction. The control system can adjust the motor's output according to application needs, achieving precise position control and speed regulation. Performance Parameters: The performance parameters of micro DC gear motors include rated voltage, rated speed, rated torque, efficiency, etc. These parameters are crucial for selecting and designing motor systems. In summary, micro DC gear motors have been widely applied under the trends of miniaturization, precision, and efficiency, providing reliable driving force for many electric devices and systems.
Contact Information
Service Hotline:+86 0769-3901 7383
Mobile Phone: +86 180 0260 1103
Email: sunweihong@silentgear.cn
Factory Address: No. 15, Century Road, Baihao Industrial Zone, Houjie Town, Dongguan City, Guangdong Province
Quick Navigation
Online message
Contact Us
COPYRIGHT 2024 Dongguan Silent Industrial Co., Ltd.