Elektrim Brake Service Manual
3
The brake disk (11) has two
friction
linings
situated
between the mounting disk (9)
and the armature (5). In brakes
envisaged for direct mounting
onto the motor bearing shield,
the role of the mounting disk
is performed by the motor
bearing shield. Acting on the
armature (5) is the force of
spring (4) which, transferred
onto the brake disk (11)
friction linings, causes their
friction against the surface of
the mounting disk (9) and the
armature (5) and generation of
braking torque transferred onto the gear wheel (12) mounted on the motor shaft on a key and
secured against axial shift by the circlip (13) - Fig. 2.
Current fed to the brake electromagnetic
coil (2) winding through a rectifier causes
excitation of the electromagnet and
attraction of the armature (5) along with
simultaneous elimination of the air gap “a”
(a=0) and spring pressure on the friction
linings of the brake disk (11), and at the same
time, releasing of the brake - Fig. 3.
The regulating bolts (8) screwed into the
electromagnetic body (1) set the distance of
the body from the face of the mounting disk
(9) (or motor bearing shield), and at the same
time set the value of the gap “a” - Fig. 4.
The brakes are secured to the motor bearing
shield or the mounting disk (9) by means
of the mounting bolts (6) spaced along the
brake circumference. Before securing the
brake to the mounting disk, first secure
the disk (9) to the motor or the device
cooperating with the brake, by means of
bolts (14) - Fig. 4.
The brakes are provided with a casing (7) -
Fig. 1. - enabling sealing of the brake, and
with a V-Ring (10) - Fig. 1. - sealing the motor
shaft passing through the brake. In this
way, protection category IP 55 is assured. In
the new brakes, the air gap “a” is factory set
to the nominal value - see Table 1. As the
friction linings wear, the gap may attain its
highest value. Exceeding the value “a max.”
- see Table 1, causes reduction in braking
torque and deterioration of effective braking