Honda CB160 Shop Manual page 110

106
5. ELECTRICAL PARTS
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fig. 5. 89 Ports of main safety units
fig. 5. 90 Spiral horn
Fig. 5. 9 I Horn construction
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Fig. 5. 92 Relation between voltage and current
d. In case of improper contact (described in section.
Bl, confirmation of 0-ring damage should be made.
It is advisable to employ liquid sealer together
with the 0-ring after cleaning the interior.
5.
6 Safety parts
A.
Circuit
For the circuit, refer to the section on electric
distribution. (Fig.
5.
89)
B. Horn
There are three types of electrical diaphragm horns,
flat, spiral, and long pipe types. The principle is the
same in each horn. In Model CB 125 and CB 160,
the spiral type horn is employed. (Refer to Fig.
5. 91)
Construction and principle of horn
As shown in the figure, if the horn button switch·
(SJ is closed, current is fed from terminal A to con-
tact point B which excites electromagnet C and
D and comes out at terminal E. Thus,
it
draws
armature G and depresses insulator H by tripping
contact point B and disconnecting at current C and
D. Then, axis rod F to which G is installed is pushed·
up by plate spring P. and S closes again ; current is.
fed ...... the operation mentioned above is then re-
peated. As the result, diaphram P and resonator
Q,
which support F vibrate and generate sound. Screw
I adjusts volume. By turning the screw I the position.
of .J supporting the contact points is vertically changed
and the distance in which G moves is chanaed prior
to the opening of contact point B. The amplitude
of P and Q is changed and the sound volume is cont-
rolled (Refer to Fig. 5. 91}
The spark suppressor at contact point B is not em-
ployed in the small type horns of two-wheel vehicles.
The volume of sound (sound pressure) does not
change corresponding to current, shown in the figure
on the left. Hence, even if the adjustment is per-
formed in the direction in which the current is in-
creased, at a certain point, only current is increased
and sound quality is lessened. However, the volume
of sound does not increase. Hence, it is desirable,
to limit the volume and maintain a small current;
When sufficient sound is generated, proper adjustment
has been performed. When horn volume is natural.
the current will match the standard value. (Refer to
Fig. 5. 92)