Dynamic Assessment of Vibration of Tooth Modification Gearbox Using Grey Bootstrap Method

Table 1

Parameters of the gearbox.

Parameter	Input shaft	Middle shaft		Output shaft
	Driving gear 1	Driven gear 2	Driving gear 3	Driven gear 4
Tooth number	23	26	25	75
Modulus/mm	5	5	3	3
Pressure angle/deg.	20	20	20	20
Helix angle/deg.	11.478	11.478	12.102	12.102
Rotation	Right-hand	Left-hand	Left-hand	Right-hand
Tooth width/mm	53	53		80
Modification coefficient	0.032	−0.032	0	0
Transmission ratio	1.13		3