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Specializes in automotive/motorcycle/industrial belts, 20+ years in belt manufacturing, Two ISO9001/IATF16949 certified factories, R&D department, premium materials and precision engineering, efficient warehousing management with a FIFO system.

22/05/2026

Synchronous belts (also known as timing belts) are widely used in conveying, indexing, and positioning applications requiring high torque, high force transmission, and high acceleration.
Unlike V-belts, which transmit power via friction between the belt and pulleys, synchronous belts use positive meshing between belt teeth and pulley grooves, eliminating slip. This delivers extremely high power transmission efficiency and excellent positioning accuracy.

In addition, synchronous belts perform exceptionally well in highspeed applications, especially under high torque or thrust loads.
One major factor enabling high-speed operation is the belt tooth profile, which affects tooth strength, meshing characteristics, and the tendency for ratcheting (tooth jumping).
Synchronous belt tooth profiles fall into three main categories: trapezoidal, curvilinear, and modified curvilinear. Manufacturers also offer proprietary variations (especially modified curvilinear) for low noise, high speed, or higher precision.
Trapezoidal Tooth Profile
The original synchronous belt profile, still widely used today. It offers higher efficiency than V-belts but creates high stress at the tooth root, leading to rapid wear in high-speed applications.

Imperial trapezoidal belts:MXL (0.08″), XL (0.2″), L (0.375″), H (0.5″), XH (0.875″), XXH (1.125″), LT (0.0816″)
Metric Tseries:T2.5 (2.5 mm), T5 (5 mm), T10 (10 mm)Standard trapezoidal profile for general driving and conveying.
Metric ATseries:AT5 (5 mm), AT3 (3 mm), AT10 (10 mm)Improved Tprofile with larger tooth capacity and stronger cord. Higher load capacity, better for high-torque, highprecision applications.
L, H, XH, XXH: Neoprene with fiberglass reinforcement
T2.5, T5, T10, AT3, AT5, AT10: Polyurethane with steel cord reinforcement
AT profiles provide better load distribution and less backlash than T profiles, ideal for linear actuators and packaging equipment.

Curvilinear Tooth Profile
Rounder shape with deeper grooves, reducing stress at the meshing zone. Enables higher force transmission and higher speeds.Deeper grooves also lower the risk of ratcheting. However, curvilinear profiles require larger clearances, resulting in greater backlash than trapezoidal profiles.

Originally developed by Gates as HTD (High Torque Drive).
Metric HTD pitches: 3 mm, 5 mm, 8 mm, 14 mm
Material: Neoprene with fiberglass reinforcement

Superior to trapezoidal profiles for high torque and high speed, with better tracking

Modified Curvilinear Tooth Profile
Proprietary designs with shallower tooth depth and larger flank angles than standard curvilinear profiles.
Key advantages:
Less backlash
Higher torque/load capacity
Better flank contact
Lower tooth stress
Minimal tooth deformation
Lowest ratcheting tendency even under heavy loads
The best choice for highspeed, highacceleration, heavyload drive systems.

Common pitches: 2 mm, 3 mm, 5 mm, 8 mm, 14 mm
Materials: Neoprene + fiberglass; polyurethane + Kevlar/carbon fiber (high torque)
Noise Considerations
Noise is common in highspeed synchronous drives, caused by:
1.Meshing impact
2.Air trapping and expulsion between teeth
Modified curvilinear belts generate the lowest noise due to smoother meshing and larger contact area. Noise is also affected by pre-tension and material selection.

27/04/2026

Technical Troubleshooting for Synchronous Belts
Common Failures, Root Causes & Solutions
1. Abnormal Wear
Symptoms: Worn/flattened teeth, side wear, fabric peeling; premature wear on tooth surface/back
Causes: Model mismatch; too small pulley diameter; shaft misalignment; excessive tension; foreign particles
Solutions: Use matched model; ensure pulley diameter meets standard; align shafts/pulleys; set proper tension; clean and protect
2. Tooth Jumping / Loss of Position
Symptoms: Position error; clicking noise under load; motor idling
Causes: Insufficient tension; overload; too few meshing teeth; poor system rigidity/bearing wear
Solutions: Adjust tension; recalculate torque (safety factor ≥1.5); increase meshing teeth; replace worn bearings
3. Excessive Noise & Vibration
Symptoms: High-pitched noise/humming at high speed; belt flapping; machine vibration
Causes: Heavy meshing impact; poor pulley balance; misalignment/tension issues; foreign matter in grooves
Solutions: Use curved teeth; balance pulleys; correct alignment/tension; keep grooves clean
4. Cracking & Breakage
Symptoms: Transverse breakage, back cracking, layer separation; core wire exposure, hardened rubber
Causes: Shock loads/sudden stops; pulley burrs; high temperature/oil/chemicals; forced installation; bending fatigue
Solutions: Reduce shocks; remove burrs; use resistant belts; install properly; follow pulley diameter requirement
Key Tips for Long Service Life
Use correct model; ensure alignment; set proper tension; replace worn pulleys with belts; protect from oil, dust and high temperature

Choose CHIBOSS Synchronous Belts for stable transmission and long service life.

24/04/2026

🚀 Shipment is on its way!
CHIBOSS automotive drive belts are heading to our customers worldwide.
From production to delivery, every link is under strict quality control.
Consistent quality & on-time delivery are our commitment to you.
Looking forward to building more win-win partnerships together!

15/04/2026

New equipment has arrived at CHIBOSS factory!
We keep investing and upgrading for higher precision and better quality.
Where Power Meets Durability ✨
Take a look inside CHIBOSS factory – advanced production lines, professional team, and uncompromising quality.
We don’t just make drive belts; we deliver stable performance for your business.
CHIBOSS – Global drive belt solution provider.

13/04/2026

Characteristics and Models of Various Transmission Belts

V-Belt

V-belt is the most widely used, wear-resistant and low-cost.
Classification
Standard V-Belt (Most Common)
Models: Y, Z, A, B, C, D, E
Y, Z: Micro and low-power household appliances, small motors
A, B: Machine tools, fans, water pumps (most frequently used)
C, D, E: High-power, heavy-duty machinery
Narrow V-Belt (High-efficiency Narrow Type, Much Stronger Than Standard V-Belt)
Higher load capacity, smaller size, suitable for high-speed and high-power transmission.Models:
Standard Width System (Common in Europe): SPZ, SPA, SPB, SPC (power increases in this order)
Effective Width System (American Standard, Commonly Used): 9N(3V), 15N(5V), 25N(8V) (3V < 5V < 8V)Commonly used in industrial equipment, compressors, machine tools.
Other V-Belt Variants
Banded V-Belt: Multiple belts connected together, anti-vibration, anti-jumping, for high-power fans/pumps
Cogged V-Belt: Cogged side structure, better flexibility, suitable for smaller pulleys, good heat dissipation

Flat Belt (Mainly for Conveying, Also for Transmission)
Features
Thin, good flexibility
For high-speed transmission and light-duty conveying
Obvious slipping, low load capacity
Models: Rubber flat belt, nylon canvas flat belt, canvas flat belt
Applications: Conveyors, textile machines, small transmission devices

Round Belt
Features
Circular cross-section, good elasticity
Ultra-light transmission, allows large center distance and small pulleys
Extremely low load capacity, easy to slip
Models: Classified by diameter: Φ2, Φ3, Φ4, Φ5, Φ6...Applications: Small household appliances, toys, printers, light-duty transmission

Poly-V Belt (Multi-Ribbed Belt)
Features
Combination of flat belt and V-belt, with multiple longitudinal ribs on the back
Good flexibility, low noise, no jumping, stable at high speed
Suitable for compact spaces, high power, multi-pulley transmission
Models: PH,PK, PJ, PL, PM (most common)
PK: Automobiles
PJ: Light-duty (automotive accessories)
PL: Medium-duty (machine tools, compressors)
PM: Heavy-duty
Typical Applications: Automotive engine accessories, air conditioning pumps, steering pumps, high-speed spindles

Timing Belt (Toothed Belt) - Only Non-Slip High-Precision Type
Features
Meshing transmission, no slipping, accurate transmission ratio
High speed, high power, precise positioning
High requirements for center distance and installation accuracy
Fast response, stable transmission
High transmission efficiency (97% - 99%)
Types
Trapezoidal Tooth
Pitch increases gradually from left to right
Imperial Trapezoidal Tooth: MXL, XXL, XL, L, H, XH, XXH
Metric Trapezoidal Tooth: T2.5, T5, T10, T20
Modified Trapezoidal Tooth: AT5, AT10, AT20
Curvilinear Tooth
Circular Arc Tooth (HTD/H): H3M, H5M, H8M
Flat Top Circular Arc Tooth (STPD/S): S3M, S5M, S8M (widely used, also known as high-torque timing belt)
Concave Parabolic Tooth (R): R3M, R5M, R8M
Applications: CNC machine tools, servo transmission, robots, automotive timing belts, precision conveying

10/04/2026

Where Power Meets Durability ✨
Take a look inside CHIBOSS factory – advanced production lines, professional team, and uncompromising quality.

We don’t just make drive belts; we deliver stable performance for your business.

CHIBOSS – Global drive belt solution provider.

20/03/2026

Eid Mubarak
🌙 ﷽🌙
🎊السلام عليكم ورحمة الله وبركاته !🎊
🎐Wishing all our Muslim brothers and sisters a joyous Eid al-Fitr, good health, success in all matters, and blessings in both worlds. 🎐
🎉 عيد سعيد ، عيد مبارك !
🎈تقبل الله منا ومنكم صالح الأعمال🎈
أمين🤲

19/03/2026

CHIBOSS: Forging a Quality Benchmark in Transmission Belts
with Hardcore Intelligent Manufacturing Strength

CHIBOSS is a leading manufacturer of automotive and industrial transmission belts, boasting over ten professional production lines and an annual output of millions of units, solidly meeting global bulk procurement demands with large-scale, standardized production. We uphold the principle of prioritizing quality over cost in equipment investment, with core production and testing equipment for rubber mixing, calendering, rubber wrapping, vulcanization, grinding, cutting and more all sourced from top manufacturers in Germany, the US, Japan, and other countries. This world-class hardware builds a solid technological barrier for product quality from the source.
As critical processes for rubber production, mixing and calendering are engineered to the highest precision at CHIBOSS. Our imported mixing equipment features fully automated material weighing and process control, ensuring consistent quality of each rubber compound batch. The German-made calendering equipment enables precise control and real-time inspection of rubber temperature and thickness, with a thickness Cpk index far exceeding the industry standard, guaranteeing stable product performance.

Most of our production lines adopt semi-automated or highly automated systems. The vulcanization process is controlled by an advanced closed-loop system, with valve operations monitored and adjusted automatically by computers. Poka-yoke error-proof functions are applied across key production links, minimizing human error and further enhancing product quality stability while simplifying operations for workers.

Quality is the lifeline of our brand. Rooted in the philosophy of everyone is responsible for quality, CHIBOSS has been committed to building a robust quality management system since its founding. We have successively obtained ISO9001, IATF16949, ISO14001 and OHSAS18001 certifications, which not only ensure international standards in production and product quality, but also safeguard employee health and safety, environmental friendliness, and consistent quality output, laying a solid foundation for sustainable development.

With top-tier equipment, precise process control and a comprehensive quality management system, CHIBOSS has earned long-term trust from global customers with stable, high-quality products. We will continue to deepen our expertise in the transmission belt industry, drive continuous innovation in products and technologies, and strive to be a global quality benchmark for transmission belts with unwavering dedication to excellence.

08/03/2026

Happy Women's Day! May you be brave, brilliant, and always unapologetically yourself. 💐

04/03/2026

Welcome to Zone B, 9.2F09 of the Canton Fair Exhibition Hall
2026/03/04~03/06 Asia Bearing Exhibition

02/03/2026

How to Choose the Correct Automotive Poly V-Belt

1. Confirm the Belt Code (Most Important)
Standard format:Number of Ribs + PK + Effective Length
Example: 6PK1220
6: number of ribs
PK: standard profile for automotive belts
1220: effective length (mm)
The full code must match exactly.

2. Check Engine & Vehicle Model
The same car model may use different engines with different belts.
Always select by engine model, not just vehicle name.

3. Choose Quality by Application
OE / Premium vehicles / High-performance engines
Benefits: high precision, low noise, long life, stable transmission.
Economy cars / Aftermarket / Light-duty use
Benefits: cost-effective, reliable for daily use.

4. Check Tension System
Automatic tensioner: length tolerance ±3mm is usually acceptable.
Manual adjustment: strictly use standard length; better longer than shorter.

5. Common Mistakes to Avoid
Only checking length, ignoring rib count → cannot fit.
Using a shorter belt → damages bearings, causes sudden breakage.
Low-quality belts → slipping, noise, early failure.

Select CHIBOSS Poly VBelts for your vehicle. Backed by our 100,000 km or 200,000 km warranty, we deliver durability and total peace of mind for every journey.

Address

Keying Road
Suzhou
215000

Website

http://www.mychiboss.com/

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