Arc tooth Timing tooth

Slot type	Pitch pb	Deep slot hg	Slot radius R	Addendum angle r1	Space width s	Two pitch pitch 2δ	Tooth 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	MXL		XXL		XL		L		H		XH		XXH
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
Deep slot 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
Slot width Φ+1.5°	20		25		25		20		20		20		20
Fillet radius rb	0.35		0.35		0.41		1.19		1.60		1.98		3.96
Tip 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
Two pitch pitch 2β	0.508		0.508		0.508		0.762		1.372		2.794		3.048

Material selection and product characteristics

The belt body used Japanese imports of high-quality synthetic chloroprene rubber, and mixed with a variety of different uses of rubber materials; skeleton materials for high quality glass fiber cord imported from Japan; with tooth surface with high elastic nylon cloth 66 protection. The product is similar to the general synchronous belt transmission, and can be widely used in the textile, light industry, chemical industry, machine tools and other general machinery to transfer power. Customers can flexibly according to the actual needs of the length of cutting.

Related matters needing attention

1) circular arc gear is divided into single circular arc gear and double circular arc gear, the contact line strength of the single circular arc gear is higher than that of the involute gear under the same condition, but the bending strength is lower than the involute. 2) single arc gear transmission: convex teeth of the pinion tooth profile in pitch, tooth profile center at the pitch circle; gear tooth profile concave tooth in pitch, tooth profile of the center tends to pitch outside. The P1 radius of tooth profile P2 gear tooth profile radius slightly larger than the small gear tooth profile, so when the two to K, the normal line through the C node, then the tooth contact, immediately separated, but tooth profile and another end adjacent to it immediately contact, namely two K1, K gear '1, K2, K, K3, K' 2 '3...... Each point in turn along the meshing line contact. Therefore, the concave and convex tooth profile of the arc gear at any end is only used for instantaneous meshing. A new type of circular arc gear in theory is instantaneous point meshing, so the arc gear drive is often referred to as the arc point meshing gear transmission. After running gear, the actual tooth profile of high gear along with a long line of contact. Arc gear transmission characteristics are: (1) the radius of curvature is much larger than that of involute gear transmission, the contact strength ratio of involute gear transmission is about 0.5 ~ 1.5 times; (2) the rolling speed of two teeth along the meshing line direction, between the tooth surface is easy to form oil film, high transmission efficiency, can reach 0.99 to 0.995; (3) circular gear along the direction of tooth wear uniform, and easy running; (4) circular arc gear without undercut phenomenon, it is the smallest number of teeth is less. But the arc gear center distance, cutting depth and helix angle error sensitivity, the influence of three errors on the carrying capacity is large, so the arc gear high requirements on manufacturing and installation precision. In addition, the single circular arc gear tooth bending strength is weak; cutting the same modulus of large and small gear, need to use two different hob. 3) double arc gear transmission: work, to see from one end, first concave convex gear tooth drive, driven gear left, with its concave convex part to promote each other, so the double arc gear at the same time there are two contact points in theory, after running this kind of drive, there are actually two contact lines, multi tooth and multiple point meshing. In addition, because of its tooth root thickness, double arc gear, not only carrying capacity than a single arc gear transmission is about 30%, and drive more stable, less vibration and noise, the two gear and can be used in the same match on the hob processing. Therefore. In the case of high speed and heavy load, the double circular arc gear drive has the trend of replacing single circular arc gear drive. 2) arc gear using a soft tooth surface or hardened, hardened by general with the dwarf tooth. 4 (ARC) gear transmission design steps: (1) simplified design: according to the transmission power, input speed, transmission ratio and other conditions, to determine the main parameters of the center distance, modulus. If the center distance and modulus are known, skip this step. (2) geometric design calculation: design and calculation of the basic parameters of the gear, and the geometric size calculation. (3) strength check: in the basic parameters, accurate tooth surface contact strength and bending strength check. (4) if the check does not meet the strength requirements, can return. 5) procurement tips 1 the production of the company with the domestic equipment is equipped with synchronous belt, but also to replace the use of imported pulleys. 2 custom timing belt pulleys, please provide pulley drawings (figure may not have to draw the pulley tooth size), the company also can provide users with specifications, with round hole, groove, width and size for the user to draw the pulley drawings; also can provide services for surveying and mapping pulley user. 3 with the outer diameter of the wheel, the end face runout, radial runout in line with the following table 1, table 2, table 3. 4 various specifications of the timing belt selection with the tooth surface width must comply with the requirements of Table 4 below. 5 the outer diameter of the pulley and the size of the retaining wall shall be selected according to the schedule. 6 list of specifications not included in the schedule, the company can also produce.
Outer diameter tolerance of timing belt pulley(mm) Table1

Pulley diameter	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

Can also produce。
Synchronous pulley（mm）表2

Pulley diameter	Allowable jitter
≤ 101.60 > 101.60 ~ 254.00 > 254.00	0.10 带轮外径 × 0.001 0.25 +[(带轮外径-254.00) × 0.005]

Can also produce。
Radial runout of synchronous belt wheel（mm） table 3

Pulley diameter	Hop value
≤ 101.60 > 101.60 ~ 254.00	0.13 0.13 +[(Pulley diameter-203.20) × 0.005]

Can also produce。
Various types of synchronous belt tooth surface width size(mm) table 4

Model	Timing belt width		Minimum actual width of synchronous belt pulley
	Code	tape width	Two side pulley	Single side band pulley	Non stop 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

1、Synchronous pulley type
2、Dimensions, tolerances and technical parameters
3、Various types of synchronous belt tooth surface width size table