Atlas Copco Air Motors

LZB Vane motors
Introduction
LZB vane motors are designed to provide high performance
and high standards of reliability. Typically, they are characterized
by a high power output and small physical size, Figure
14.
The design of the motor is chosen to be long and slim. This
gives a number of advantages like a high power to volume
ratio, a low air consumption and long vane life. All motors
utilise five vanes, which are supplied with vane air, to ensure
excellent starting and low speed performance. Multi-step
planetary gears are used to meet the torque and speed
requirements of the application, offering high efficiency with
compact dimensions.
Shaft loading
Figure 14
The maximum allowable loads on a given motor´s output
shaft are illustrated in Figure 15. The relevant load curve
code for a motor is stated in the data tables for each specific
motor designation, under the ”Shaft load code” column.
These values have been calculated for shaft and bearing working
lives of 10 million turns. To achieve a working life of 100
million turns, the loading factor must be halved.
Fr (max 400 N)
Threaded
Fa Fa
shaft
Fr
(N)
450
400
350
300
250
200
150
100
50
0
Curve a
Curve b
Curve c
500 1000
1500 2000
2500
1 2 AT L A S C O P C O A I R M O T O R S
Fa
(N)
Fr
(N)
3500
3000
2500
2000
1500
1000
Fr
(N)
4000
3000
2000
1000
500
500
Curve e
Curve g
1000 1500 2000 2500 3000 3500 4000 4500
Curve h
Curve g
Curve f
Curve e
Cylindric
shaft
Fr
(N)
2000
1500
1000
500
Curve d
Curve c
Curve b
Curve a
1000 2000
A = 20 mm
A = 15 mm
A = 20 mm
A = 15 mm
500
Coversion factor
1N = 0.225 lbf
1000
A = 20 mm
A = 15 mm
A = 9 mm
A = 8 mm
3000
Fr
1500
4000
A
2000
5000
Fa
(N)
6000
Fa
5000
Fa
(N)
Figure 15
7000
Fa
(N)
Threa
shaft