Timing Pulley

Model type

Available models can refer to synchronous belt single tooth

Supply characteristics

1. Generally, it must be produced according to drawings, but also can be mass produced according to standard parts.
2. It can be used for different materials such as 45# steel, aluminum alloy, cast iron, nylon, etc.

Model Specifications
Material Selection And Characteristics
Selection Chart
Related Precautions
Volon timing belt supply table

Arc tooth Timing tooth

Groove	Pitch pb	Tooth depth hg	Cogging arc radius R	Addendum half angle r1	Tooth width s	Double pitch top distance 2δ	Tooth profile angle
3M	3	1.28	0.91	0.26~0.35	1.90	0.762	≈14°
5M	5	2.16	1.56	0.48~0.52	3.25	1.144	≈14°
8M	8	3.54	2.57	0.78~0.84	5.35	1.372	≈14°
14M	14	6.20	4.65	1.36~1.50	9.80	2.794	≈14°
20M	20	8.60	6.84	1.95~2.25	14.80	4.320	≈14°

Dimension of linear type pulley

Model number	MXL		XXL		XL		THE		H		J.		XXH
Alveolar bottom width bw	0.84±0.05		1.14±0.05		1.32±0.05		3.05±0.10		4.19±0.13		7.90±0.15		12.17±0.18
Tooth depth hg	0.69	0	0.84	0	1.65	0	2.67	0	3.05	0	7.14	0	10.31	0
		-0.05		-0.05		-0.08		-0.10		-0.13		-0.13		-0.13
Alveolar half angle Φ + 1.5 °	20		25		25		20		20		20		20
Tooth root fillet radius rb	0.35		0.35		0.41		1.19		1.60		1.98		3.96
Addendum fillet radius rt	0.13	+0.05	0.30	+0.05	0.64	+0.05	1.17	+0.13	1.60	+0.13	2.39	+0.13	3.18	+0.13
		0		0		0		0		0		0		0
Double pitch 2β	0.508		0.508		0.508		0.762		1.372		2.794		3.048

Specification and model mark

1. Synchronous belt wheel type
2. Tooth shape size, tolerance and technical parameters
3. Various types of synchronous belt wheel tooth surface width dimension table

The material selection is generally based on carbon steel, but also can be processed with aluminum alloy, copper, nylon and other materials according to customer's requirements; if the outer diameter of the pulley is greater than 250mm, generally use cast iron. The characteristics of arc gear transmission:

1) The arc gear transmission trial meshing transmission, the value is suitable for helical gears, but not for spur gears.
2) The relative radius of curvature is larger than the involute, and the contact strength is higher than the involute.
3) The sensitivity to center distance changes is greater than the involute curve. During processing, the cutting depth is required to be high, radial displacement cutting is not allowed, and assembly errors are strictly controlled.

1) The arc cylindrical gears are divided into single arc gears and double arc gears. The contact line strength of single arc gears is higher than that of involute gears under the same conditions, but the bending strength is lower than that of involutes.
2) Single arc gear transmission: The working tooth profile of the convex tooth of the pinion is outside the pitch circle, and the center of the tooth profile is on the pitch circle; the working tooth profile of the concave tooth of the large gear is inside the pitch circle, and the center of the tooth profile is slightly off the pitch circle outside. Since the tooth profile arc radius p2 of the large gear is slightly larger than the tooth profile radius p1 of the pinion gear, when the two tooth profiles turn to point K and their common normal passes through node c, the teeth touch and separate immediately, but are adjacent to it The tooth profile of the other end face of the gear immediately touches, that is, the two gear teeth K1, Kˊ1, K2, Kˊ2, K3, Kˊ3 ... each point in turn touches along the meshing line. Therefore, the concave and convex tooth profiles on either end of the arc gear are only used for instantaneous meshing. A pair of new arc gears is in theory instantaneous point meshing, so arc gear transmission is also often called arc point meshing gear transmission. After the gear teeth are run-in, the tooth profile can actually be in contact with a relatively long line along the tooth height. The characteristics of arc gear transmission are: (1) The comprehensive radius of curvature is much larger than that of involute gear transmission, and its contact strength is about 0.5 to 1.5 times higher than that of involute gear transmission; (2) The two teeth are along the direction of the meshing line. The rolling speed is very high, the oil film is easy to form between the tooth surfaces, the transmission efficiency is high, generally up to 0.99～0.995; (3) The arc gear wears evenly along the tooth height direction, and it is easy to run in; (4) The arc gear has no root Cut phenomenon, so the minimum number of teeth can be less. However, arc gears are very sensitive to errors in center distance, tooth cutting depth, and helix angle. These three errors have a greater impact on the load-bearing capacity. Therefore, arc gears require higher manufacturing and installation accuracy. In addition, the bending strength of the teeth of the single arc gear is weak; cutting the large and small gears of the same module requires two different hobs.
3) Double arc gear transmission: When working, from one end, first the concave part of the driving gear tooth pushes the convex part of the driven gear tooth, and after leaving, the convex part pushes the concave part of the other party, so the double circular arc gear transmission In theory, there are two contact points at the same time. After running-in, this transmission actually has two contact lines, so multiple pairs of teeth and multi-point meshing can be realized. In addition, due to the large tooth root thickness, the double-arc gear transmission not only has a load capacity of about 30% higher than that of the single-arc gear transmission, but also has a smoother transmission, less vibration and noise, and can be matched with the same hob. Two gears. therefore. At high speed and heavy load, double circular arc gear transmission tends to replace single circular arc gear transmission.
2) The arc gear mainly adopts soft tooth surface or medium-hard tooth surface, and low profile teeth are generally used when hard tooth surface is adopted.
4) Design steps of arc gear transmission:
(1) Simplified design: According to the transmission power, input speed, transmission ratio and other conditions of the gear transmission, determine the main parameters such as center distance and modulus. If the center distance and modulus are known, you can skip this step.
(2) Geometric design calculation: design and calculate the basic parameters of the gear, and calculate the geometric size.
(3) Strength check: After the basic parameters are determined, accurate check of tooth surface contact strength and tooth root bending strength.
(4) If the check does not meet the strength requirements, it can be returned.

5) Purchasing instructions
1. The pulleys produced by our company are not only matched with the synchronous belts of domestically produced equipment, but also can be used in place of imported pulleys.
2. For customized timing pulleys, please provide pulley drawings (it is not necessary to draw the tooth profile size of the pulley in the figure). The company can also draw belts for users according to the specifications and models provided by the user, the inner hole of the pulley, the keyway, and the width. Wheel drawings; can also provide users with services such as surveying and mapping wheels.
3. The outer diameter tolerance, end face runout, and radial runout of the pulley conform to the requirements of Table 1 , Table 2 , and Table 3 below .
4. The width of the tooth surface of the pulleys selected for various specifications and models of synchronous belts must meet the requirements of Table 4 below .
5. The outer diameter and rib size of the pulley are selected according to the attached table.
6. The pulley specifications not listed in the attached table can also be produced by our company.

Tolerance of outside diameter of synchronous belt pulley (mm) Table 1

Outer diameter of pulley	Tolerance
<25.4	+ 0.050
> 25.4 ~50.80	+ 0.080
> 50.80 ~ 101.60	+ 0.100
> 101.60 ~ 177.80	+ 0.130
> 177.80 ~ 304.80	+ 0.150
> 304.80 ~508.00	+ 0.180
> 508.00	+ 0.200

The allowable runout of the end face of the synchronous belt wheel (mm) Table 2

Outer diameter of pulley	Allowable runout
≤ 101.60 > 101.60 ~ 254.00 > 254.00	0.10 Outer diameter of pulley × 0.001 0.25 +[(Outer diameter of pulley -254.00) × 0.005]

Allowable radial runout of synchronous belt wheel (mm) Table 3

Outer diameter of pulley	Allowable jump value
≤ 101.60 > 101.60 ~ 254.00	0.13 0.13 +[(outer diameter of pulley -203.20) × 0.005]

Tooth surface width dimensions of various types of synchronous belt wheels (mm) Table 4

Model number	Timing belt width		Minimum actual width of synchronous pulley
Model number	Codename	Bandwidth	Pulleys on both sides	Single side wall pulley	No ribs pulley
MXL	012	3.0	4	5	6
	019	4.8	5.8	6.8	7.8
	025	6.4	7.5	8.5	9.5
XL	025	6.4	7.5	8.5	9.5
	031	7.9	9	10	11
	037	9.5	11	12	13
L	050	12.7	14	15.5	17
	075	19.1	21	22	24
	100	25.4	27	28.5	30
H	075	19.1	21	23	25
	100	25.4	27	29	31
	150	38.1	40	42	44
	200	50.8	53	55	58
XH	200	50.8	57	60	63
	300	76.2	84	87	90
	400	101.6	111	114	117
XXH	200	50.8	57	61	64
	300	76.2	84	88	92
	400	101.6	111	115	118
	500	127.0	138	142	145
T2.5	4	4	6	7	8
	6	6	8	9	10
	10	10	12	13	14
T5 AT5	6	6	8	9	11
	10	10	12	13	15
	16	16	18	20	22
	25	25	27	29	31
T10 AT10	16	16	18	22	24
	25	25	27	30	33
	32	32	34	37	40
	50	50	53	56	59
T20 AT20	32	32	35	38	40
	50	50	53	56	60
	75	75	78	81	85
	100	100	105	108	112
3M S3M	6	6	9	10	11
	9	9	12	13	14
	15	15	18	19	20
5M S4.5M S5M	9	9	12	13	14
	15	15	18	19	20
	25	25	28	29	30
	30	30	34	36	38
8M S8M	30	30	34	36	38
	40	40	44	46	48
	50	50	54	56	58
	85	85	90	92	94
14M S14M	55	55	65	68	70
	85	85	95	99	102
	115	115	126	130	133
	170	170	180	183	187
20M	70	70	80	84	89
	85	85	96	100	104
	115	115	127	131	134
	170	170	182	185	190
	230	230	245	248	254
	290	290	295	300	310
	340	340	355	360	370

About fulong

Ningbo Fulong Synchronous Belt Co., Ltd. is famous China Linear Type Pulley suppliers and OEM/ODM Linear Type Pulley factory, located in Longshan Town, Cixi City, Zhejiang Province. It was founded in 1984. It is the earliest enterprise engaged in the research and development, production and sales of rubber synchronous belts in China.

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About fulong

Honor

2021 antistatic timing belt

2021 acid and benzene resistant special timing belt

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New Application Patent -1

Click Out Our Latest News

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Excellent quality and
Attractive price

menu

search

language

Custom Linear Type Pulley

Products

Contact Us

Timing Pulley

Related Products

About fulong

Honor

2021 antistatic timing belt

2021 acid and benzene resistant special timing belt

Wipe glass robot timing belt

New Application Patent -1

Click Out Our Latest News

Excellent quality and Attractive price

Excellent quality and
Attractive price