Table 9.5

Single-row tapered-roller bearings (GOST 333-79). Lightweight series, a=12¸18°

dc = 0.5∙(D+d) dp = 0.25∙(D-d) lp = 0.68∙ B	Type designation	d	D	T	B	C	d 1	d 2	D 1	Load rating, kN	e
Cr	C 0
			11.75							6.1	0.45
			13.25						14.0	9.0	0.31
			15.25						21.0	13.0	0.36
			16.25						24.0	17.5	0.36
			17.25						31.5	22.0	0.36
			18.25						38.5	26.0	0.37
			19.25						46.5	32.5	0.38
			20.75						50.0	33.0	0.41
			21.75						56.0	40.0	0.37
			22.75						65.0	46.0	0.41
			23.75						78.0	58.0	0.35
			25.25						96.0	82.0	0.37
			27.25						107.0	84.0	0.39
			28.25						112.0	95.2	0.42
			30.50						130.0	109.0	0.43
			32.50						158.0	125.0	0.38
			34.50						168.0	131.0	0.41
			37.00						185.0	146.0	0.41

9.3.5. Lip seal.

Dimensions of lip seals are given in table 9.6.

Table 9.6

Standard lip seals (GOST 8752-79)

	d	D	h 1	d	D	h 1
20;21;22			55;56;58
		63;65
		70;71
30;32
35;36;38
		90;95
48;50

9.3.6. Sprocket (Fig 9.6)

- diameter of the hub d _hub = (1.5…1.7)· d _shaft;

- length of the hub l _hub=(1.2…1.5)· d _shaft;

- thickness of the web C = 0.93· B _bush,

where B_bush is the bush width (table 8.2).

9.3.7. Pulley (Fig. 9.7)

- diameter of the hub d _hub=(1.8…2.2)· d _shaft;

- length of the hub l _hub=(1.5…2.2)· d _shaft ≤ B, where B is the pulley width;

- thickness of the rim δ=0.005· d +3 mm;

- thickness of the web C =(1.0…1.2) ·δ (for pulleys of d ≤ 300 mm);

- number of arms z (for pulleys of d ≥ 300 mm)

if 300 < d ≤ 500 mm than z =4

if d > 500 mm than z =6

- design thickness of the arm

,

where F_t is turning force obtained in p.7.8; d is diameter of the pulley; z is number of arms; [ σ_b ] is allowable bending stress (for cast irons [ σ_b ]=30 MPa)

9.3.8. Coupling.

In mechanical drives with single stage speed reducers we use a coupling with rubber-bushed studs. Dimensions of this coupling are given in table 9.7.

Table 9.7