Gear adjustment should be "stable", mirror adjustment should be "accurate", coasting should not be too "aggressive". Randomly adjusting the rearview mirrors, coasting in neutral, and driving in D gear all the time... how many of these common driving habits do you have? In fact, many people do not handle many small details properly while driving, and some of these habits can be damaging to the car. For this reason, we specially consulted with industry experts to select three common driving misconceptions and solve your problems.
Mistakenly stepping on the brake, being overly eager. Driving an automatic should have a "stable" gear. Using the "D gear all the way" method while driving an automatic vehicle is an extremely incorrect driving habit. Although it's an automatic vehicle, there are different types of functional gears set for different conditions, requiring gear adjustments for "stable" driving. Kang Cheng, Technical Director of the Tianjin Command Department Automotive Repair Center, stated that some drivers, for convenience, when stopping briefly at intersections, step on the brake but do not shift the gear to N. Such prolonged misuse greatly increases wear on the brake disc and brake oil. Kang Cheng suggests regarding gear changes in automatic vehicles: "When the vehicle speed is reduced to 0 by the braking system, the gear must be shifted to N. Secondly, choose the correct functional gear for stable driving. To steadily drive uphill or downhill, shift the gear to L or 2, which are marked as climbing or descending gears. These gears will better assist with road conditions, reducing unnecessary consumption during engine power output."
Adjusting the rearview mirror accurately: Rearview mirrors are looked at by the driver hundreds of times a day. However, how do you adjust them "accurately" so they are both comfortable to look at and conducive to driving safety? Han Jianwei, a national first-class racing referee of the China Automobile Federation, introduced: "For center rearview mirror adjustment, when adjusting the left and right mirror positions, the left edge should just cut to the right ear in your image in the mirror. This means that under normal driving conditions, you should not see yourself in the center rearview mirror. As for up and down positions, place the distant horizon line in the center of the mirror. For adjusting the left rearview mirror up and down, place the distant horizon line in the middle. The left-right vision position should be adjusted so the left side of the car image occupies 1/4 of the mirror area. Since the driving seat is on the left, controlling the situation on the right side is not as easy, plus the need for occasional roadside parking, the right rearview mirror should show more ground area, occupying 2/3 of the mirror area. As for the left-right position, adjust so the car image occupies 1/4 of the mirror area."
Coasting to save fuel "aggressively" ruins the car: Many drivers believe that coasting without pressing the gas pedal will "aggressively" save fuel. In reality, this driving method not only doesn't save much fuel but also "aggressively" ruins the car. Here, we specifically interpret the sliding wear of front-wheel-drive automatic cars. When coasting in N gear in a front-wheel-drive automatic car, the engine starts after the torque converter begins working, but the hydraulic coupling is very weak. The transmission oil pump also starts working, and the transmission oil begins entering the lubrication and preparation state. At this point, the transmission oil circulates idly waiting for gear instructions, allowing the drive wheels to rotate freely. This means that when the driver switches to neutral while driving, the transmission does not supply oil, accelerating wear on the transmission and transmission gears under such no-oil conditions. This driving method "aggressively" ruins the car. According to simple calculations, at a coasting speed of 80 kilometers per hour, coasting in neutral travels a bit further than coasting in gear, but the wear on the transmission is higher than the normal gear-engaged driving state, with a simple calculated wear rate exceeding 16%. Such a fuel-saving method is not recommended for car owners to use.
(1) Phenomenon: A Dongfeng self-loading truck broke its entire leaf spring group twice due to overloading and poor road conditions. When replacing with new leaf springs, it was found that the mounting plane of the drive axle housing had cracks between the two threaded holes on the upper left of the main reducer, and three bolts on the top were broken.
(2) Cause and Analysis: Due to the vehicle being heavily overloaded and driven on uneven roads, with the vehicle bouncing and the leaf springs deforming up and down, shocks easily cause the U-bolts securing the leaf springs to loosen. If not tightened in time, when the car moves forward, due to vehicle stability and braking, the leaf springs shift position. With the U-bolts continuously loosening, the leaf springs wear against their seats and become loose, tilting the drive axle housing backward by an angle. The axial force transmitted from the driveshaft to the pinion shaft acts on the upper end of the housing body. Poor road conditions, large leaf spring deformation, and changing driveshaft torque cause the force on the upper end of the housing plane to vary, making it prone to microscopic cracks in weak areas. Over time, this leads to cracking. Additionally, under alternating torque, the upper end bolts of the housing plane loosen. If not tightened in time, the bolts experience impact and shear forces, causing them to break one by one.
If the gap between the main reducer housing and the drive axle housing at the positioning stop mouth is too large, and the sliding fork of the driveshaft cannot extend and contract freely, it will accelerate the cracking of the housing plane.
(3) Prevention and Control Measures:
1) The vehicle should avoid overloading or minimize overloading.
2) Regularly check if the U-bolts securing the leaf springs are loose and tighten them according to the specified torque (when fully loaded), preventing the "false tightening" phenomenon caused by rusted nuts.
3) On bumpy muddy roads, reduce speed to prevent the vehicle from slipping.
The above content is jointly released by the Sanitation Garbage Truck Official Website (http://www.clwlu.com/) | www_clwlu_com and Garbage Truck Manufacturer (http://www.clwwcw.com/) | www_clwwcw_com. For more exciting content: Small Sanitation Garbage Trucks.
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