Sprockets: Brandau Gelenkketten

Sprockets and Chain Wheel Discs

Sprockets are the complement to an optimal chain drive (drive chains or conveyor chains). The good interaction between sprocket and chain forms the basis for a long service life of these two proven machine elements.

Standard sprockets
- to factory standard -

Sprocket design

We supply steel sprockets in the following designs:

A = Plate wheel (without hub)
B = Hub on one side (welded on)
C = Hub on both sides (welded on)
D = Hub on one side (solid)
E = Hub on both sides (solid)

Other designs, such as wheels with split hubs or cast sprockets, are also available on request.

For chains subject to heavy contamination, we recommend fitting milled dirt-relief grooves. In special cases, an enlarged tooth gap clearance can also be provided by arrangement.

Sprocket materials

The service life of sprockets depends on the forces acting on them and the wear resistance of the selected sprocket material.

The following materials are preferably used:

Steel per DIN EN 10025 – S355J0 (St52-3)
Quenched and tempered steel per DIN EN 10083 – C45
Plastics (e.g., PA 6 or POM)

For heavily loaded sprockets, heat treatment of the teeth (e.g., induction hardening) is recommended.

Other materials can be determined together with us as needed.
Please tell us about your application.
We are happy to advise you.

Sprockets for conveyor chains

When designing conveyor systems, sprockets with Z ≥ 8 should preferably be used. At speeds above 0.6 m/s, only sprockets with Z ≥ 10 should be installed.
Conveyor sprockets are supplied as standard with a pilot bore.
On request, we also supply the wheels with finished bore, keyway, and thread for a set screw.
Fitted seats for ball bearings can also be provided in the hubs.

Drive wheels for roller chains

To achieve as uniform a chain speed as possible, the number of teeth should not be less than 15.
Smaller tooth counts disproportionately increase joint surface wear on the chain.
The maximum number of teeth should not exceed 150.
Larger tooth counts also lead to increased chain wear.
Favorable gear ratios are around 3:1.
From 8:1 upward, the efficiency of the ratio deteriorates and chain wear increases.

Order information

For optimal manufacturing of sprockets, the following information is important:

Number of sprockets required
Number of teeth on the sprockets
Type of associated chain (DIN or ISO designation, pitch, inner width, bushing diameter or roller diameter. For Gall chains, the pin diameter d1 must be specified.)
Sprocket material
Design without or with hub (in which case the hub length NL and hub diameter DN must be specified)
Pilot bore or finished bore (with fit dimension)
Keyway dimensions (e.g., per DIN 6885-1)
Dimensions of the set screw thread

Request offer via Fax ( +49 (0) 6674 / 8440 ) or E-Mail (info@brandau.de).

Standard sprockets
- Calculation of sprocket diameters -

Technische Details

Sprocket calculation factors

p	Pitch
Z	Number of teeth
D₁	Roller, bushing, or pin diameter
D_o	Pitch circle diameter
D_k	Outside (tip) circle diameter
D_f	Root circle diameter
D_N	Hub diameter
N_L	Hub length
Z_b	Tooth width
2α	Pitch angle =	360°			α =		180°
		Z					Z
γ	Tooth flank angle
k	Tooth tip height above the pitch polygon (Diameter of the pitch polygon = p x cot α)
r₁	Tooth root radius
r₂	Tooth flank radius
y	Tooth-count factor		=	1		=	1
				sin α			sin (180° / Z)

Outside (tip) circle diameter Dk

a)	Bushing conveyor chains without rollers: D_k = D_o + 0,8 D₁
b)	Bushing conveyor chains with non-marking rollers: D_k = D_o + 0,6 D₁
c)	Bushing conveyor chains with running rollers: D_k = D_o + 0,4 D₁
d)	Bushing chains: D_k = D_o + 0,8 .. 1,0 D₁
e)	Gall chains: D_k = D_o + D₁

The above calculations yield guideline values. These also apply to the hollow pin and trough conveyor chains listed in the catalog. The exact outside (tip) circle diameter is determined by us, or according to the customer's specifications.

Tooth-count factors "y" for determining the pitch circle diameter from 5 to 129 teeth
	Z	y	Z	y	Z	y	Z	y	Z	y
	5	1,7013	30	9,5668	55	17,5166	80	25,4713	105	33,4275
	6	2,000	31	9,8845	56	17,8347	81	25,7896	106	33,7458
	7	2,3048	32	10,2023	57	18,1529	82	26,1078	107	34,0641
	8	2,6131	33	10,5201	58	18,4710	83	26,4261	108	34,3823
	9	2,9238	34	10,8380	59	18,7892	84	26,7443	109	34,7007
	10	3,2361	35	11,1558	60	19,1073	85	27,0625	110	35,0188
	11	3,5495	36	11,4737	61	19,4255	86	27,3808	111	35,3371
	12	3,8637	37	11,7916	62	19,7437	87	27,6990	112	35,6554
	13	4,1786	38	12,1096	63	20,0619	88	28,0172	113	35,9737
	14	4,4940	39	12,4275	64	20,3800	89	28,3355	114	36,2919
	15	4,8097	40	12,7455	65	20,6982	90	28,6537	115	36,6102
	16	5,1258	41	13,0635	66	21,0164	91	28,9720	116	36,9285
	17	5,4422	42	13,3815	67	21,3346	92	29,2902	117	37,2468
	18	5,7588	43	13,6995	68	21,6528	93	29,6085	118	37,5651
	19	6,0755	44	14,0176	69	21,9710	94	29,9267	119	37,8833
	20	6,3925	45	14,3356	70	22,2893	95	30,2449	120	38,2015
	21	6,7095	46	14,6537	71	22,6074	96	30,5632	121	38,5199
	22	7,0267	47	14,9717	72	22,9256	97	30,8815	122	38,8381
	23	7,3439	48	15,2898	73	23,2437	98	31,1998	123	39,1564
	24	7,6613	49	15,6079	74	23,5620	99	31,5180	124	39,4747
	25	7,9787	50	15,9260	75	23,8802	100	31,8363	125	39,7929
	26	8,2962	51	16,2441	76	24,1984	101	32,1545	126	40,1112
	27	8,6138	52	16,5622	77	24,5167	102	32,4728	127	40,4295
	28	8,9314	53	16,8803	78	24,8349	103	32,7910	128	40,7478
	29	9,2491	54	17,1984	79	25,1531	104	33,1093	129	41,0661