Special Issue; Products for Industrial Machinery - NTN

NTN TECHNICAL REVIEW No.742006
Torque mNm
40
35
30
25
20
15
10
5
Test conditions
Operation cycle: 1.1 sec. on, 0.2 sec. off
Operation period: 300 hrs.
Running speed: 220 min -1
0
0 50 100 150 200 250 300
1.5 Standard shape and materials used and
torque setting
The standard shape of the NTB14 is illustrated in
Fig. 4, and the materials used are listed in Table 1.
Note NTN will supply non-standard shaped variants
upon request.
Allowable torque setting rage: 24.5–39.2 mN-m
{250–400 gf-cm}
2-2.5
9
6
Time h
Fig. 3 Results of endurance test
1 2 3 4
14
Old design
NTB14
2-3.2
2. Introduction of the TDL16 Compact,
Lightweight Torque Diode
2.1 Overview
To realize full-color capability, photocopying
machines and printers are incorporating increasing
numbers of components and movable parts. However,
the floor space requirements of this equipment need
to be roughly the same as with conventional
monochromatic machines. Therefore, the need for
more compact components is great. At the same time,
demands are mounting for compliance with energy
conservation and environmental regulations, as well
as for satisfaction of requirements to acquire Blue
Angel Mark certification. For these reasons,
photocopying machine and printer manufacturers are
making efforts to decrease power consumption for this
type of equipment.
The lock-type torque diode can hold the drives for
trays and other components in position with its
reverse-input prevention function even when the
equipment is powered off. For this reason, this type of
torque diode is advantageous for saving energy
compared to arrangements in which the drive is held
in position by supplying power to the motor.
NTN has developed and continues to provide the
TDL28 lock-type torque diode for office automation
equipment. However, since its components are made
of steel, it is heavy and structural limitations make
development of a compact variant of this torque diode
difficult. To address this challenge, NTN has
developed the TDL16, a new torque diode that
features both compact size and light weight.
2-2.5
12
12.4
3.9
Fig. 4 Design of NTB14
Table 1 Composition and material of NTB14
Code Component
description
Outer resin
1
component
2 Lid
3 Coil spring
4 Inner ring
Lubricant
Material used
Polyacetal resin (hue: black)
Polyacetal resin (hue: white)
Spring steel
Iron-based sintered material
Chemical attack-free oil
(impregnated into the inner ring)
Photo. 2 New type Torque Diode
-70-