4. CARACTERISTICAS
GENERALES
El contacto de
dientes es gradual
Reduce el ruido y
las cargas
dinámicas
Transmite una
mayor potencia
Aumenta la
velocidad
Incrementa la
relación de
transmisión
6. • Diámetro medio: D= ma z
• Diámetro de cabeza: D= ma (z+2)
• Diámetro de fondo: D= ma (z-2,5)
DIMENSIONES:
Valores Caracteristicos:
Número de dientes, z
Módulo, m en mm
Paso= m
a, ángulo de hélice.
Valores habituales de 15º
20º
RUEDAS HELICOIDALES
Módulo aparente:
ma = m / cos a
12. ADDENDUM, DEDENDUM Y SEPARACION
Parameter Symbol Coarse Pitch
(pd<20in-1
)
Fine pitch
(pd •20in-1
)
Metric module
system
Addendum a 1/ pd 1/ pd 1.00 m
Dedendum b 1.25/ pd 1.200/ pd+0.002 1.25 m
Clearance c 0.25/ pd 0.200/ pd+0.002 0.25 m
Table 14.2 Formulas for addendum, dedendum, and clearance
(pressure angle 20°, full-depth involute.)
Text Reference: Table 14.2, page 623
15. ESFUERZO DE FLEXION VS DUREZA BRINELL
Figure 14.18 Effect of Brinell hardness on allowable bending stress for
two grades of through-hardened steel [ANSI/AGMA Standard 1012-
F90, Gear Nomenclature, Definition of Terms with Symbols, American
Gear Manufacturing Association, 1990.]
Text Reference: Figure 14.18, page 638
16. CONTACT STRESS VS. BRINELL HARDNESS
Figure 14.19 Effect of Brinell Hardness on allowable contact stress for two grades of
through-hardened steel. [ANSI/AGMA Standard 1012-F90, Gear Nomenclature,
Definition of Terms with Symbols, American Gear Manufacturing Association, 1990.]
Text Reference: Figure 14.19, page 639
17. FACTOR GEOMETRICO
Figure 14.22 Spur gear geometry factors for pressure angle of 20° and full-
depth involute. [ANSI/AGMA Standard 1012-F90, Gear Nomenclature,
Definition of Terms with Symbols, American Gear Manufacturing
Association, 1990.]
Text Reference: Figure 14.21, page 643
18. FACTOR DE APLICACION
Driven Machines
Power Source Uniform Light shock Moderate shock Heavy shock
Application factor, Ka
Uniform
Light shock
Moderate shock
1.00
1.20
1.30
1.25
1.40
1.70
1.50
1.75
2.00
1.75
2.25
2.75
Table 14.5 Application factor as a function of driving power source and driven
machine.
Text Reference: Table 14.5, page 643
19. FACTOR DE TAMAÑO
Diametral pitch pd,
in.-1
Module, m,
mm
Size factor, Ks
5
4
3
3
1.25
5
6
8
12
20
1.00
1.05
1.15
1.25
1.40
Table 14.6 Size factor as a function of diametral pitch or module.
Text Reference: Table 14.6, page 644
20. LOAD DISTRIBUTION FACTOR
Figure 14.23 Load distribution factor as function of face width
and ratio of face width to pitch diameters. Commercial quality
gears assumed. [From Mott (1992).]
Text Reference: Figure 14.23, page 645
21. DYNAMIC FACTOR
Text Reference: Figure 14.24, page 645
Figure 14.24 Dynamic factor as function of pitch-line velocity and
transmission accuracy level number.
22. RUEDAS CONICAS
Valores Caracteristicos:
Número de dientes, z
Módulo, m medio en mm
Paso= m
1 - 2, ángulos de paso.
Ejes perpendiculares:
1 + 2 = 90º
• Diámetro medio: D= m z
• Diámetro de cabeza: D= m (z+2)
• Diámetro de fondo: D= m (z-2,5)
DIMENSIONES:
24. En la figura se
muestra una batidora
industrial, en la que
podemos ver los
diferentes tipos de
engranajes.
APLICACIÓN DE LOS DIFERENTES TIPOS DE
RUEDAS