Timing belt drive consists of an endless belt whose inner surface has equally spaced teeth and belt pulley which have the relative teeth. It is a kind of new type drive which has synthesized all the good points of belt drive, chain drive and gear drive, while working, the teeth of the belt and the teeth of the pulley joggle each other to transmit the motion and the dynamic force.

Timing belt drive has such features as exact transmission ratio, non-sliding, constant velocity ratio which can be gained, smooth motion, absorption of vibration, little noise, the big range of transmission ratio which can normally reach 0.98, compacting structure, suitable to multi-axis transmission, no need lubrication, no pollution and so on. Therefore, the product can normally work well in the places where don't allow the pollution and where the working condition is bad, widely be used in machinery drives, such as textile, machine tool, tobacco, communication cable, printing, packaging, foodstuff, jet-express, sewing, electrical household appliance, petro-chemicals, sporting equipments, carving, etc.

Timing belts we produced have a lot of advantages: wear resistant, low elongation rate and high strength, resistant to wide temperature range, aging resistance, ozone resistant, etc.

Physical Mechanical Property of Industrial Timing Belts

Timing Belts Design Data

Design Procedure
Design Conditions:
a. The type of the driver pulley and the driven pulley				b. Daily working time
c. P: Nominal power P			d. N1: Small pulley's rotating speed	e. N2: Big pulley's rotating speed
f. Projected centre distance			g. Special demand for the drive space
Calculation Item		Code Name	Formula and Data	Unit	Information
Design Power		Pd	Pd=KaP	KW	The factor of working conditions, see Chart 1 Nominal power
The Type of Belt			According to n1 and Pd, choose from drawing 1, drawing 2, drawing 3, drawing 4		n1 the small pulley's rotating speed r/min
Drive Ratio		i	i=n1/n2		n2 the big pulley's rotating speed r/min
Pulley Diameter	Pulley Teeth number	Z1  Z2	Confirm it according to the principle of Z1≥Zmin, it takes the round number after being calculated according to Z2=iZ1		Z1 is small pulley's teeth number, Zmin see chart 2
(mm)	Pulley Pitch Diameter	d1  d2	It has been calculated according to d1=Pb*Z1*3.1416	mm	Pb is pitch, the small pulley's pitch diameter
			It has been calculated according to d2=Pb*Z2*3.1416	mm	The big pulley's pitch diameter
Pitch Line Length		Lp	L0: projected length of the pitch line	mm	Projected centre distance, confirm it with the drive space
			L0=2a0+1.57(d2+d1)+(d2-d1)²/4a0
			Choose Lp according to L0
Actual Center Distance		a	Approximate formula is: a= {M+[M²-8(d2-d1)2]½}/8	mm	M=2Lp-(Z2+Z1)Pb
Gear Mashing Tooth Number Coefficient		Kz	Zm≥6, Kz=1    Zm < 6, Kz=1-0.2 (6-Zm)		Zm is gear meshing tooth number
					Zm=ent [Z1/2-PbZ1(Z2-Z1)/2aπ2]
The Fatcor of Width		Kw	Kw=(bs/bso)1/1.14
Basic Rating Power		P0	It recommends to use the basic rating mini width of various models.	KW
			See Chart 3 ~ Chart 17 for P0
Rating Power		Pr	Pr=Kz*Kw*P0	KW
Belt Width		bs	Confirm it according to the principle of Pd,  Pd≤Pr, bs≥bso(Pd/KzP0)1/1.14	mm	Bso is datum width, see chart 18
Testing the Operational Capability		Pr	Pr=10-3v(kzkwTa-bsmV²/bs)	KW	Ta, m  see chart 19   V=PbZ1n1/60000
			If Pr>Pd the design is good

Design summary: The type of belt, belt length, belt width
                                  The belt's code name
                                  The teeth number, pitch, diameter, width of the small or big pulley
                                  The type of pulley
                                  The pulley's code name
                                  The actual center distance