Single S-cam Brake Chamber Supplier

How to judge the actuation efficiency of Single S-cam Brake Chamber through stroke test?

In the commercial vehicle braking system, the actuation efficiency of Single S-cam Brake Chamber is directly related to the vehicle braking performance and driving safety. As the core transmission component of the braking force, the accuracy, response speed and stability of its push rod stroke are the key indicators for evaluating its performance.
1. The scientific principle of stroke test
The core of the stroke test is to verify the consistency of its action under different air pressures by measuring the displacement of the brake chamber push rod. The brake chamber of the Single S-cam structure pushes the diaphragm through compressed air, drives the push rod to drive the S cam to rotate, and finally realizes the clamping or release of the brake shoe. Ideally, the push rod stroke should be linearly related to the air pressure input and must comply with the stroke range specified by SAE J1812 or ISO 1728 standards (usually 1.25 inches to 2.5 inches). If the stroke deviates from the threshold, it may cause insufficient braking force, drag wear or delayed response.
2. Standardized test process
Static reference calibration
Use a laser rangefinder or digital stroke sensor to record the initial position of the push rod under zero air pressure in the air chamber to eliminate the influence of assembly errors.
Dynamic pressure loading
Input standard air pressure in stages (such as 20 psi, 60 psi, 100 psi) and monitor the push rod displacement curve in real time. Focus on two points:
Critical pressure point response (such as whether the 5 psi starting pressure meets the standard);
Full pressure stroke compliance rate (the stroke under 100 psi must reach more than 90% of the design value).
Return hysteresis detection
After the air pressure is quickly released, the push rod should be completely reset to the initial position. If the residual stroke exceeds 0.1 inches, it is judged that the seal is aged or the spring has failed.
3. Data interpretation and efficiency optimization
Through the measured data of the T1ZC laboratory, it is found that the brake air chamber with an actuation efficiency of less than 85% generally has the following problems:
Diaphragm elastic attenuation (common in high temperature and high humidity conditions);
S cam sleeve wear (causing push rod sway friction);
Reset spring fatigue (extending brake release time).
In this regard, T1ZC uses double-coated diaphragm technology and hardened alloy camshaft sleeves to control the push rod stroke fluctuation rate within ±3%, and ensures batch consistency through automated assembly processes. The actual test data of its customers in the South African mining area shows that the optimized brake air chamber still maintains an actuation efficiency of 92% after 50,000 cycle tests, which is 15% higher than the industry average.
4. T1ZC's innovative practice
As a professional manufacturer in the field of brake air chambers, Zhejiang T1ZC relies on four major production bases (T01 R&D headquarters, F02/M03/Y04 customized production lines) to build a full-chain quality control system from material research and development to terminal testing. The company's original intelligent stroke test bench can simulate extreme environments from -40℃ to 120℃, and combined with AI algorithms to predict component life, it provides customized solutions for scenarios such as African mining vehicles and South American long-distance heavy trucks.