Fixed Competitive Price Mg 5 Spare Parts - Saic Motor Awesome Sales For MG 350 Front Wiper Blade – Zhuomeng

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Product Knowledge

How does the wiper work?

The power source of the wiper comes from the motor, which is the core of the whole wiper system. The quality requirements of wiper motor are quite high. It adopts DC permanent magnet motor, and the wiper motor installed on the front windshield is generally integrated with the mechanical part of worm gear. The function of worm gear and worm mechanism is to reduce speed and increase torque. Its output shaft drives the four-bar linkage, which changes the continuous rotation motion into the left-right swing motion.

The wiper motor adopts 3-brush structure to facilitate speed change. The intermittent time is controlled by the intermittent relay. The charge and discharge function of the return switch contact of the motor and the resistance capacitor of the relay is used to make the wiper sweep according to a certain period. The blade rubber strip of the wiper is a tool to directly remove rain and dirt on the glass. The blade rubber strip is pressed to the glass surface through the spring strip, and its lip must match the angle of the glass in order to achieve the required performance.

Generally, there is a wiper control knob on the handle of the automobile combination switch, which is equipped with three gears: low speed, high speed and intermittent. At the top of the handle is the key switch of the washer. When the switch is pressed, washing water is ejected to wash the windshield with the wiper. Scrubber system is a very common device in automobile. It is composed of water storage tank, water pump, water delivery pipe and water spray nozzle.

The water storage tank is generally a 1.5L ~ 2L plastic tank. The water pump is a micro electric centrifugal pump, which transmits the washing water of the water storage tank to the water spray nozzle, and sprays the washing water into a small jet to the windshield through the extrusion of 2 ~ 4 water spray nozzles, which plays the role of cleaning the windshield with the wiper.

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Causes of deterioration

1. Abrasion of knife edge caused by rain and air (sand, mud, dust and foreign matters);

2. Corrosion of support coating soaked in rainwater and cleaning solution (including acid or alkali);

3. Corrosion of adhesive strips caused by rain and immersion in cleaning solution (including acid or alkali);

4. Paraffin or automobile exhaust gas (oil); (vibration and pollution)

5. Cold and low temperature (snow, ice); (make the adhesive strip hard and brittle)

6. High temperature (windshield, sunlight), resulting in rubber cracking and hardening;

7. Adhesive strip damage (UV, ozone);

8. The pressure of rocker arm makes the rubber strip under pressure for a long time;

9. The ultraviolet ray of UV spectrum in sunlight, temperature and humidity cause discoloration, brightness / strength reduction, cracking, peeling, pulverization and oxidation to the support coating.

10. Countless times of back and forth cycle work, the normal wear and fatigue of the rubber strip.

Correct use

Improper use of automobile wiper blades (wiper, wiper blade and wiper) will lead to early scrapping or unclean scraping of wiper blades. No matter what kind of wiper, the reasonable use should be:

1. It must be used when there is rain. The wiper blade is used to clean the rainwater on the front windshield. You can’t use it without rain. You can’t scrape dry without water. Due to the increase of friction resistance due to lack of water, the rubber wiper blade and wiper motor will be damaged! Even if there is rain, it should not be wiped if the rain is not enough to start the wiper blade. Be sure to wait until there is enough rain on the glass surface.  The “enough” here will not block the driving line of sight.

2. It is not recommended to use the wiper blade to remove the dust on the windshield surface. Even if you want to do this, you must spray glass water at the same time! Never dry scrape without water. If there are solid things on the windshield, such as the dried up feces of birds such as pigeons, you must not use the wiper directly! Please clean the bird droppings manually first. These hard things (such as other large particles of gravel) are very easy to cause local injury to the wiper blade, resulting in unclean rain.

3. The premature scrapping of some wiper blades is directly related to improper car washing. There is a thin oily film on the glass surface before the car leaves the factory. When washing the car, the front windshield is not wiped lightly, and the oil film on the surface is washed off, which is not conducive to the downflow of rain, resulting in rain easy to stop on the glass surface. Second, it will increase the friction resistance between the rubber sheet and the glass surface. This is also the reason for the instantaneous pause of the wiper blade due to immobility. If the wiper blade does not move and the motor continues to run, it is very easy to burn the motor.

4. If you can use slow gear, you don’t need fast gear. When using the wiper, there are fast and slow gears. If you scrape fast, you will use it more frequently and have more friction times, and the service life of the wiper blade will be reduced accordingly. The wiper blades can be replaced half by half. The wiper in front of the driver’s seat has the highest utilization rate. It has been used more times, has a large range, and has large friction loss. Moreover, the driver’s line of sight is also very important, so this wiper is often replaced. The replacement times of the wiper corresponding to the front passenger seat can be relatively less.

5. Pay attention not to physically damage the wiper blade at ordinary times.  When the wiper blade needs to be lifted during car washing and daily dusting, try to move the heel spine of the wiper blade and return it gently when it is placed. Do not snap the wiper blade back.

6. In addition to the above, pay attention to the cleaning of the wiper blade itself. If it is attached with sand and dust, it will not only scratch the glass, but also cause its own injury. Try not to be exposed to high temperature, frost, dust and other conditions. High temperature and frost will accelerate the aging of the wiper blade, and more dust will cause a bad wiping environment, which is easy to cause damage to the wiper blade. It snows at night in winter. In the morning, do not use the wiper blade to remove the snow on the glass.

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How to choose

First, find out what kind of wiper blade your car uses. You can refer to the accompanying manual to see the wiper model indicated above. Generally speaking, the wiper blade will be sold together with the metal support rod, and it is rare to sell the blade alone. If you don’t know, ask the clerk of the parts store to help identify it. Now there is also a kind of boneless wiper blade. The metal support rod becomes a metal sheet embedded in the wiper blade, and the boneless wiper blade is more evenly stressed.

Second, pay attention to whether the way the support rod is connected to the wiper rocker arm is matched, because some support arms are fixed to the rocker arm with screws. Remember to pay attention when buying.

Third, pull up the wiper and touch the cleaned rubber wiper blade with your fingers to check whether it is damaged and how elastic the rubber blade is. If the blade is aged, hardened and cracked, the wiper blade is unqualified.

Fourth, during the test, place the wiper switch at various speed positions to check whether the wiper at different speeds maintains a certain speed.  Especially in the intermittent working state, pay attention to whether the wiper blade maintains a certain speed when moving.

Fifth, check the wiping state and whether the wiping support rod swings unevenly or misses scraping. If the following three conditions occur, the wiper blade is unqualified. The swing is not smooth, and the wiper does not jump normally. The contact surface of the rubber and the glass surface cannot fully fit, resulting in wiping residue. After wiping, the glass surface presents a water film state, and small stripes, fog and linear residues are generated on the glass.

Sixth, during the test, pay attention to whether the motor has abnormal noise. In particular, when the wiper motor buzzes and does not rotate, it indicates that the mechanical transmission part of the wiper is rusted or stuck. At this time, turn off the wiper switch immediately to prevent burning the motor.

Importance and correct installation

Wiper blade is an important safety part. It must be able to effectively remove rain, snow and dirt; Able to work at high temperature (80 ° C above zero) and low temperature (30 ° C below zero); It can resist the corrosion of acid, alkali, salt and other harmful substances. It is a component to keep the outer surface of the windshield clean and ensure clear vision in rainy and snowy weather. It is one of the important guarantee systems for driving safety and an indispensable component of motor vehicles. The function of the wiper blade is not to scrape off the rainwater on the glass. Its real function is to smooth the rainwater on the glass surface to form a uniform water film layer, allow the light to pass smoothly without refraction, bending and deformation, and improve the driver’s clear visual area. Wiper blades are consumables. It is recommended to check and replace them regularly. It is best to check once every 6 months and replace once a year! Qiqi reminds that when buying wiper blades, you must pay attention to identification and selection. It is best to buy them in a more formal auto parts store or online auto supplies mall.  There are the following steps to correctly install the wiper blade:

A. Pull up the wiper arm and remove the old wiper blade;

B. use foam or cardboard pad to gently roll down the swing arm on the glass.  (remember: prevent the glass from being broken or scratched by the wiper arm!)

C. According to the type of rocker arm on the vehicle, select the appropriate accessories from the parts package. Be sure to hear the “click” sound during installation to ensure that it has been installed on your wiper blade;

D. The wiper blade shall be installed according to the installation instructions provided on the back of the package, and ensure that it has been firmly installed on the wiper rocker arm;

E. If conditions permit, clean the glass surface before loading the wiper blade to remove wax, oil, dust and other foreign matters;

F. For the series of rubber knife edge coated with silver powder, dry brush for 10 ~ 20 cycles before formal wiper, and then spray water to wipe;

G. If the installed wiper blade cannot be wiped clean, please use a clean cloth to clean the rubber blade of the wiper blade.

Replacement judgment method

The above is the replacement cycle of the wiper in normal use. When the wiper blade has the following symptoms, it may have to be replaced in advance:

1. Damages that can be identified by eyes: cracks, cracks, aging, rust, deformation, attachments, discoloration, etc. it is recommended to replace the wiper blade in time.

2. Damage that can be identified by ears: the rubber strip has fallen off from the skeleton, and it will beat the front windshield every time, making abnormal sounds such as jumping and shaking. It is recommended to replace the wiper blade in time.

3. Judge by the wiping effect: when you use the wiper, if scratches will be left on both sides or the middle glass after each scraping, it is recommended to replace the wiper blade.

Modern wipers combine two mechanical technologies

1. The wiper is powered by a motor and a reduction worm gear.

2. The motor drives the wiper through the linkage mechanism.

It takes a lot of power to make the wiper blade move back and forth quickly on the windshield. In order to generate this power, designers used worm gears at the output of small motors.

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