project maker
08-08-2014, 12:43 PM
Stress Analysis of Gearbox
[attachment=66748]
Abstract—
This technical paper is on stress analysis of
gearbox used in sugar industry. ANSYS is used for stress
analysis. The main objective for carrying out this analysis was
to improve the life of the gear. After the analysis of gears from
existing gearbox the reason for failure was found. The reason
for failure of the gear was due to wear of gear teeth edges.
This is caused due to high stress concentration along the gear
teeth edges. To relieve these stress concentration three
modifications in the design of gears were done and after that
again stress analysis of the modified gears carried out. It is
observed that the stress relieved from edges and got
concentrated to the edges of the holes provided at the roots of
the teeth. The three design modifications were done as first,
the edges of the gear teeth were tapered by an angle of 20,
second, making groove in the gear wheel and third, making
holes at the roots of the gear teeth. The expected increase in
life of the gears of the gearbox would be three years.
Definition of the Problem
Leading manufacturers of gearbox, which are used in various
utensil and sugar mill machinery, faced the following
problems
Interference
Surface Fatigue
Fracture
The gears fail when tooth stress exceeds the safe limit.
Therefore, it is essential to determine the maximum stress that
a gear tooth is subjected to, under a specified loading.
Analysis of gears is carried out so that these can be prevented
from failure. When failure occurs, they are expensive not only
in terms of the cost of replacement or repair but also the cost
associated with the downtime of the system of which they are
a part
Conclusions
This paper discussed stresses induced in gears of existing
gearbox which were not within permissible/safe limit After
modifying the design of the existing gearbox, again the stress
analysis was carried out and the results were found to be well
within allowable/safe limit. It was further observed that the
stresses induced on the gear tooth were reduced considerably
by making hole at the root of the gear tooth.
[attachment=66748]
Abstract—
This technical paper is on stress analysis of
gearbox used in sugar industry. ANSYS is used for stress
analysis. The main objective for carrying out this analysis was
to improve the life of the gear. After the analysis of gears from
existing gearbox the reason for failure was found. The reason
for failure of the gear was due to wear of gear teeth edges.
This is caused due to high stress concentration along the gear
teeth edges. To relieve these stress concentration three
modifications in the design of gears were done and after that
again stress analysis of the modified gears carried out. It is
observed that the stress relieved from edges and got
concentrated to the edges of the holes provided at the roots of
the teeth. The three design modifications were done as first,
the edges of the gear teeth were tapered by an angle of 20,
second, making groove in the gear wheel and third, making
holes at the roots of the gear teeth. The expected increase in
life of the gears of the gearbox would be three years.
Definition of the Problem
Leading manufacturers of gearbox, which are used in various
utensil and sugar mill machinery, faced the following
problems
Interference
Surface Fatigue
Fracture
The gears fail when tooth stress exceeds the safe limit.
Therefore, it is essential to determine the maximum stress that
a gear tooth is subjected to, under a specified loading.
Analysis of gears is carried out so that these can be prevented
from failure. When failure occurs, they are expensive not only
in terms of the cost of replacement or repair but also the cost
associated with the downtime of the system of which they are
a part
Conclusions
This paper discussed stresses induced in gears of existing
gearbox which were not within permissible/safe limit After
modifying the design of the existing gearbox, again the stress
analysis was carried out and the results were found to be well
within allowable/safe limit. It was further observed that the
stresses induced on the gear tooth were reduced considerably
by making hole at the root of the gear tooth.