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Automotive Bellows Dust Cover Fatigue Testing Machine

Automotive Bellows Dust Cover Fatigue Testing Machine

ModeL: UT1021B

UT1021B Automotive bellows dust cover fatigue testing machine is specifically designed for automotive steering dust covers, CV joint bellows, shock absorber dust boots, telescopic rubber bellows, and other elastic rubber and plastic expansion parts. It simulates the real-life conditions of the product's back-and-forth stretching, compression, and deformation during vehicle operation to conduct long-cycle fatigue durability tests. 


The main testing purpose are:

1. Lifespan Verification: To check the maximum service life of the bellows under specified stroke, speed, and number of cycles, determining whether the product meets overall vehicle durability standards.

2. Failure Assessment: To detect fatigue issues such as cracking, tearing, delamination, whitening, hardening, permanent deformation, and seal failure after long-term repeated motion.

3. Performance Comparison: To compare the durability of bellows made from different materials, structures, and processes, providing data for product iteration, formula optimization, and structural improvements.

4. Quality Control: For batch sample testing to ensure consistent factory quality standards and prevent widespread fatigue failures.

5. Condition Simulation: Can simulate axial extension and angular deflection in complex conditions, recreating the real stress environment under steering and bumping to produce test results that better match actual vehicle use.

General introduction

UT1021B Automotive Bellows Dust Cover Fatigue Testing Machine | UnitedTest

UnitedTest develops and manufactures the UT1021B Automotive Bellows Dust Cover Fatigue Testing Machine, a specialized durability test solution dedicated to fatigue performance testing of automotive rubber and plastic expansion components. This professional fatigue tester is widely applicable for automotive steering dust covers, CV joint bellows, shock absorber dust boots, telescopic rubber bellows, and other elastic automotive protective parts.


Designed to replicate real-world vehicle operating conditions, the UT1021B automotive bellows fatigue tester

Core Testing Purposes & Key Functions:

1. Automotive Bellows Service Lifespan Verification

This machine evaluates the maximum service life of automotive bellows under customized test strokes, operating speeds, and cycle counts. It validates whether dust covers and rubber bellows comply with official vehicle durability standards, ensuring long-term operational stability for automotive chassis and steering systems.

2. Fatigue Failure Detection & Assessment

After long-cycle repeated mechanical motion testing, the equipment effectively identifies common fatigue defects, including surface cracking, material tearing, layer delamination, whitening, hardening, permanent deformation, and sealing failure. It enables comprehensive failure analysis for defective automotive bellows components.

3. Material & Structural Performance Comparison

Manufacturers can utilize this tester to compare the fatigue durability of bellows produced with different raw materials, structural designs, and manufacturing processes. The standardized test data supports product iteration, rubber formula optimization, and structural improvement for automotive dust cover components.

4. Batch Production Quality Control

Ideal for batch sampling inspection in mass production, the UT1021B fatigue tester ensures consistent factory quality standards. It effectively prevents batch-level fatigue failure risks and guarantees uniform durability performance of finished automotive bellows and dust covers.

5. Complex Working Condition Simulation

Beyond basic stretching and compression testing, the machine simulates complex axial extension and angular deflection conditions. It perfectly recreates real stress environments generated by vehicle steering and road bumping, producing highly accurate test results that match actual on-vehicle usage scenarios.

Automotive Bellows Dust Cover Fatigue Testing Machine

Key Features

  • Test principle
  • Standard
  • Complete Machine Configuration
  • Optional angle test feature (eccentric/deflection condition simulation)
  • Sample installation
  • Test Procedure
  • Keywords

The equipment uses a servo motor with a precision ball screw closed-loop drive structure, converting the motor's rotational motion into vertical linear reciprocating movement of the worktable. By fixing the bellows sample with upper and lower fixtures, it completes fully automated reciprocating fatigue testing according to the set compression limit, tension limit, operating speed, and number of cycles.


Core Testing Principles:

1. Compression Condition: The upper fixture moves downward, compressing the bellows to the set minimum length, simulating vehicle suspension compression and steering rebound;

2. Tension Condition: The upper fixture moves upward, stretching the bellows to the set maximum length, simulating vehicle suspension extension and outward steering;

3. Closed-loop Monitoring: The system collects deformation stroke, number of cycles, and force load changes in real-time. When the sample cracks, loosens, or shows abnormal load decay, the equipment can automatically stop and record the failure data;

4. Angle Simulation Principle (Optional): The lower fixture can be preset at an angle to simulate eccentrically stressed and twisted deformation of the bellows during vehicle steering, achieving a more accurate real-world scenario replication.

Automotive Bellows Dust Cover Fatigue Testing Machine

1. ISO 13775-1:2021

Thermoplastic tubing and hoses for automotive use — Part 1: Non-fuel applications (GB/T 20462.1-2025) 

2. QC/T 1067-2024 'Technical Requirements for Automotive Wiring Harness Protective Sleeves'  

3. JT/T 1031-2016 'Technical Requirements for Corrugated Tubes for Bus Wiring Harnesses' (General Reference for Passenger Cars)  

4. QC/T 930-2013 'Clamps for Corrugated Tubes'


The machine uses a vertical dual-column gantry structure, which is strong, low in vibration, and runs smoothly, making it suitable for long-term continuous fatigue testing. The core configurations are as follows:

1. Servo Drive System

Equipped with high-precision AC servo motors and dedicated servo drivers, featuring triple closed-loop control of position, speed, and load. It starts and stops without impact, maintains stable speed, and has high repeat positioning accuracy, supporting long-term continuous operation without heat degradation.

2. Precision Ball Screw Transmission Mechanism

Uses ground-level ball screws with low friction, high transmission efficiency, and minimal backlash, ensuring uniform and linear reciprocating motion, preventing stalling and deviation, and maintaining stable accuracy for hundreds of thousands of long-cycle tests.

3. Dual Guide Column Structure

High-strength chrome-plated guide columns with precision linear bearings limit lateral movement of the worktable, ensure vertical reciprocating alignment, and prevent eccentric forces on samples that could cause test data errors.

4. High-Precision Force Measurement Module

Built-in high-resolution load sensor for real-time monitoring of tensile and compressive forces on samples, capable of detecting small fatigue degradation changes and supporting load anomaly alarm shutdown.

5. Interchangeable Upper and Lower Fixtures

Upper fixture with floating connection and lower fixture with fixed support, supporting quick replacement of bellows of different diameters and lengths, ensuring firm clamping and easy installation/removal.

6. Industrial Touch Control System

PLC industrial controller with high-definition touchscreen, fully Chinese/English interface, intuitive parameter settings, built-in data storage, curve display, and fault alarm functionality.

7. Heavy-Duty Anti-Rust Machine Base

Thickened steel plate welded frame with overall stress relief treatment, paired with leveled adjustable feet, ensuring no shaking during operation and extremely high stability.

For products like automotive steering gear dust covers that require oscillating and twisting composite fatigue tests, the equipment can be optionally equipped with an angle deflection testing module. This simulates the eccentric, twisting, and tilting forces experienced during vehicle steering. Unlike standard purely axial tests, the results better reflect the real vehicle failure modes. 

Automotive Bellows Dust Cover Fatigue Testing Machine

1. Function Principle

The lower fixture base uses an adjustable-angle structure, allowing the sample to tilt as a whole. While performing reciprocating stretching, it continuously withstands twisting and eccentric shear forces, replicating the real composite fatigue conditions of steering dust covers.

2. Angle Adjustment Range

Standard adjustable angles: 0°–30°, lockable at any position. Common standard working angles: 10°, 20°, 30°.

3. Two Configurations

(1) Manual angle adjustment: Adjust the angle as needed and mechanically lock it. Stable structure and cost-effective.

(2) Automatic swinging angle (high-end option): Dynamically swings back and forth during testing to simulate continuous steering conditions.

4. Applicable Testing Scenarios

Durability testing of steering gear covers, fatigue testing of eccentrically installed bellows, and composite durability verification under torsional deformation.


To ensure test consistency and data accuracy, the uniform installation guidelines are as follows:
1. Installation reference: Fix the large end of the corrugated tube to the lower fixture and clamp the small end in the upper movable fixture, fully simulating the actual vehicle installation structure.
2. Centering requirement: The sample must be installed vertically centered, without left or right offset, tilt, or twist, to avoid abnormal fatigue damage caused by uneven forces.
3. Clamping force: The clamping should be moderate, ensuring no slipping or loosening during the test, while avoiding excessive pressure from the fixture that could cause local pre-damage to the sample.
4. Initial state: The initial test position should be the sample’s natural relaxed state, without pre-stretching or compression, to ensure that the initial test data is true and valid.
5. Condition matching: Set the maximum compression and maximum extension according to the product drawing and test standards, strictly matching the product’s actual working limit travel.


This equipment operates with a standardized, fully automated testing process, requiring no manual supervision. The full process is as follows:

Step 1: Pre-test Check

Check the equipment power, wiring, and fixture tightness, clean up the workbench, ensure the screw and guide columns are well lubricated, and check that there is no sticking or unusual noise.

Step 2: Sample Installation and Fixing

Fix the bellows according to the sample installation standard, ensuring it is centered, not shifted, not over-compressed, and leaving the standard expansion and contraction travel.

Step 3: Parameter Setting

Set the compression lower limit, tensile upper limit, test speed, target number of cycles, load alarm threshold, sample ID, and other information on the touchscreen.

Step 4: Device Zero Calibration

Perform an origin reset, confirm that displacement and load values return to zero, and the device enters standby test mode.

Step 5: Start Fatigue Test

Click start, and the equipment automatically performs reciprocating stretching and compression cycles, displaying the number of cycles, travel, load curve, and operating status in real time.

Step 6: Automatic Monitoring and Protection

The test monitors the sample status in real time. If there is a sudden load change, sample tearing, over-travel, or other anomalies, the equipment stops immediately and saves the fault data.


UnitedTest UT1021B fatigue testing machine, automotive bellows dust cover fatigue tester, CV joint bellows durability test machine, automotive rubber plastic parts fatigue tester;

Automotive steering dust cover long cycle fatigue test, shock absorber dust boot deformation durability testing, axial extension angular deflection bellows fatigue test, automotive rubber bellows cracking and failure assessment machine, vehicle component batch quality control fatigue tester

Main Technical Specification

Drive typeServo motor with ball screw closed-loop drive
Effective test stroke0–150mm (crank-rocker mechanism)
Sample initial length range50–500mm, freely adjustable
Test frequency5–60 cycles/min, continuously adjustable
Cycle count range1–9,999,999 cycles (infinite standby available)
Load test range0–500N (customizable for larger ranges)
Force measurement accuracy±1% FS
Displacement accuracy±0.1mm
Control systemPLC with 7-inch industrial touchscreen
Stop modesstop when count reached, stop on load anomaly, manual stop, over-travel protection stop
Data featuresreal-time curves, data storage, history query, report exportable
Power supplyAC 220V 50Hz
Total power≤1.5KW
Machine dimensionsapprox. 700×600×1600mm
Machine weightapprox. 160kg



Main Accessories

ItemQuantity
Frame1 set
Servo drive/motor1 set
Screw transmission System1 set
Control system1 set
Universal bellows upper and lower clamps1 set
Leveling foot pads, fixing screws1 set
Documents (Manual, packing list, certificate)


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Beijing United Test Co., Ltd.