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2025
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08
Answers to questions about automatic adjustment arms (1) The working principle is revealed
● What is the main role of the automatic adjustment arm in a truck?
Most cardholders know about the adjustment arm, but some cardholders don't know how it works and how important it is. A few years ago, I met a construction vehicle user who had been complaining that the brakes were not working, and when I asked carefully, I found out that the vehicle had been running for several years and had never adjusted the brakes. So if you want to understand the adjustment arm, you must first start with its role.
During the driving of the truck, frequent braking will cause the brake shoes and brake drums to wear continuously, resulting in the gap between the two gradually widening. Eventually, the brake chamber pusher stroke becomes longer and the thrust drops, causing brake lag and reduced braking force.
In order to ensure driving safety, it is necessary to ensure that there is a suitable fit gap between the brake shoes and the brake drum, and the adjustment arm is the device used to adjust and control the gap between the two. Whether manual or automatic, their ultimate goal is the same, except that the automatic adjustment arm does not need to be manually intervened in the adjustment, and the control gap is more precise. ● How does the auto-adjust arm work?
At present, most card friends are familiar with the manual adjustment arm, but most of the time they adjust the brakes themselves, and they are not very clear about the working principle. I don't understand the more complex working principle of the automatic adjustment arm, so how does it realize the automatic adjustment function?
The automatic adjustment arm is designed to preset different brake clearance values according to different axle models. If the clearance exceeds the limit during normal use, the brake adjustment arm will drive the internal one-way clutch mechanism to reduce the clearance value by one gear when the braking action is returned to the position, so that the brake clearance can be kept within the correct range. In fact, its working principle is very similar to our common rope tightener, rotating more than a certain angle, the deadbolt of the rope tightener will jam the gear to prevent it from loosening, I believe everyone can understand this analogy in seconds.
● What are the benefits of the automatic adjustment arm?
Many cardholders are still unclear about what benefits the automatic adjustment arm can bring to everyone, and one-sidedly think that it is not reliable, and even think that it is more reliable to adjust the gap by their own hand. In fact, this is not the case, and the automatic adjustment arm is still very good for most users.
First, the automatic adjustment arm can keep the gap between the friction plate and the brake drum constant, which can ensure the reliability of braking to the greatest extent.
Second, the whole vehicle uses an automatic adjustment arm, which can make the braking effect consistent in all wheel positions and prevent the side slip of the tow tire caused by uneven braking force.
Third, there is no need to manually adjust the brake gap, reduce the number of maintenance and repairs, improve the attendance rate of the vehicle, and say goodbye to the embarrassment of the bottom brake of the drilling truck forever.
● Editor's postscript
In fact, everyone's doubts about the automatic adjustment arm are not limited to these, and I will continue to answer some common questions about the automatic adjustment arm in the next episode. I hope that these can give everyone a deep understanding of the automatic adjustment arm, so as to make driving life safer and more efficient.
Focus on the research and development of automotive brake systems and pneumatic brake valves to promote the development of the auto parts industry!
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