1、The role of door lock motor worm gear

Its function is to have a relatively large transmission ratio, which can reduce noise and reduce friction. Most of the locking and unlocking mechanisms of the door lock are the internal gears of the door lock machine with the 90-degree cross matching rotation of the worm gear, and the motor realizes the linear movement or rotation of the moving components by meshing the internal gears and worm gears of the locking machine to achieve the purpose of electric locking and unlocking. However, the gear and the rack meshed with it in the transmission process, because it is sliding friction transmission, more heat will be generated during operation, so that the mating surface forms a gap, the lubricating oil fluid becomes thinner due to the increase in temperature, easy to cause leakage, it may also be that the worm gear is worn too seriously for a long time, resulting in the worm gear is no longer completely meshed with the rack, and eventually leads to the loss of door lock function, endangering the safety of passengers.

2、What are the shapes of door lock motor worm gears?

  Most of the common door lock motor worm gears are long helical teeth and round straight teeth.

   Long spiral teeth are divided into left-handed, right-handed and straight teeth。Left and right worm gears are mostly cylindrical and long，The beveled threaded wheel ring wraps around the motor worm one after another，The gear size on the worm includes slender type, short thick type and short round type;

And the straight teeth are vertical striped gears that make a circle like a hob.

 The round straight teeth are round in appearance, with a short flat surface, a large number of teeth, and the teeth on the wheel are straight, and the distance between the tooth points is compact. 

3、Material difference of door lock motor worm gear

   Gear materials commonly used on door lock motor worms are metal and plastic.

   Metal gears are heavy, can withstand high load capacity, high temperature and high pressure resistance, high speed and high torque, low vibration, strong output power, high speed, from the material is also harder and stronger and tensile strength is better, but because of their strength and fatigue, friction and wear ability, loss is also large.

The plastic gear is very light, which can reduce the overall load of the motor, and the worm force point is basically far away from the core power output end of the motor, and the plastic can extend the life of the motor; Secondly, it is quiet, and the plastic worm gear has low noise and basically no sound when meshing the inner gear of the door lock; Finally, the gears maintain inherent lubricity and corrosion resistance。

   Usually each door lock motor worm gear is paired with metal or plastic when leaving the factory, when the speed of the motor, the use part, the use scene and the environment are the same, according to the wear efficiency and service life to match the most suitable worm gear is the most suitable.

4. What are the reasons for the damage of the door lock motor worm gear?

1.1、 Gear breakage, gear fracture is mainly due to unqualified gear meshing clearance and improper gear meshing position.

1.2、The gap between the motor shaft and the worm gear is large, and the gear shaft journal, needle roller bearing and housing bore that are often meshed are worn, and the mating gap between the gear seat hole and the needle roller bearing and the journal should be 0.01-0.08mm, and the bonding gap is too large or too small.

1.3、 There are foreign objects, when the surface of the gear is untidy with foreign objects, it needs to be cleaned up in time, otherwise it will aggravate the difficulty of gear work and bring unnecessary damage.

1.4、 Lack of oil, can not be well lubricated, large impact load caused by work.

1.5、 Material problems, can not support high-intensity work.

5、How to replace door lock motor worm gear?

  The plastic door lock motor worm gear, which is set on the motor shaft, can be directly removed by hand and replaced.

  The metal door lock motor worm gear is directly pressed to the motor worm through the machine, which is relatively difficult to disassemble, and it can be pulled out directly using the tooth puller. If you are not a professional in auto parts, it is difficult to replace the worm gear with the original motor, because the machine is needed to press the wheel to fit the motor shaft. Directly buying a brand new door lock motor is the most suitable choice, and owners who do not know the reason usually choose to change a door lock directly or repair it in a repair shop, which will bear an unnecessary higher cost.