1. A single throw crankshaft for a motor utilizing roller bearings, comprising:
a pair of throws with each throw having a pair of tapered openings with each tapered opening including an annular seating portion and a keyway;
a pair of drive end units with each drive end unit for insertion into and securement to one tapered opening of one throw and each drive end unit having a cylindrical bearing portion, an inner tapered portion, a key projecting laterally from the inner tapered portion and a threaded end projecting from the inner tapered portion;
a main bearing pin having a cylindrical main bearing portion and tapered and opposed cylindrical members with each tapered and each opposed cylindrical member having a key for fitting into the keyways of the throws; and
whereupon the roller bearings bear upon the cylindrical main bearing portion of the main bearing pin to facilitate the rotational movement of the crankshaft during operation of the motor.
2. The single throw crankshaft of claim 1 further comprising a plurality of self-locking nuts with the self locking nuts for locking the drive end units and the main bearing pins to the throws.
3. A multi-throw crankshaft for a mechanical device utilizing roller bearings, comprising:
at least two pairs of throws with each throw for each pair including a straight bore opening and a keyway extending through the straight bore opening;
at least a pair of drive end units with each drive end unit having a flanged inner end portion with the flanged inner end portions being received within at least one straight bore opening of one throw of each pair of throws;
at least a pair of connecting rod pins with each connecting rod pin interconnecting the throws of each pair of throws;
each connecting rod pin including opposed keys that are received in the keyways of the throws and opposed ends that terminate with an annular flanged portion;
a middle bearing pin having a central annular bearing surface, opposed cylindrical portions with each opposed cylindrical portion including a key and each opposed cylindrical portion terminating with an annular flanged portion; and
whereupon the middle bearing pin interconnects the pairs of throws to each other and each connecting rod pin interconnects the throw for each pair of throws to each other and the roller bearings bear against the central annular bearing of the middle bearing pin and the connecting rod pins to facilitate the angular motion of the crankshaft during operation of the mechanical device.
4. The multi-throw crankshaft of claim 3 further comprising a plurality of snap rings with the snap rings fitted onto the flanged inner end portions of the drive end units, the annular flanged portions of the connecting rod pins and the annular flanged portions of the middle bearing pin for locking drive end units, the connecting rod pins, and the middle bearing pin to the throws.
5. A multi-throw crankshaft for a mechanical device utilizing roller bearing, comprising:
at least two pair of throws with each throw including at least one straight bore opening and one splined opening with the splined opening including a plurality of splines;
at least a pair of drive end units with each drive end unit including a middle portion, a cylindrical portion, a key projecting from the cylindrical portion, a cylindrical splined portion located opposite of the cylindrical portion and a flanged portion extending from the cylindrical portion;
a middle bearing pin including a cylindrical central bearing portion, opposed end portions at least one of which includes circumjacent splines and a flanged terminating portion extending from the end portion that includes the circumjacent splines;
a plurality of connecting rod pins with each connecting rod pin including a central bearing portion, opposed splined ends, a neck extending from each splined end and each neck terminating with a flange; and
whereupon the middle bearing pin drivingly interconnects both pairs of throws and wherein the cylindrical splined portion of each drive end unit is inserted into the splined opening of one throw of each pair of throws and the connecting rod pins interconnect the throws for each pair of throws with the roller bearings bearing against the central bearing portions of the connecting rod pins and the cylindrical central bearing portion of the middle bearing pin to facilitate the angular motion of the crankshaft during the operation of the mechanical device.
6. The multi-throw crankshaft of claim 5 wherein the throws can include two splined openings.
7. The multi-throw crankshaft of claim 6 further comprising a plurality of crank pins with each crank pin having opposed tapered ends and each tapered end defining a bore having annular inner threads.
8. The multi-throw crankshaft of claim 7 wherein the annular inner threads of the bores are right-handed.
9. The multi-throw crankshaft of claim 8 wherein the annular inner threads of the bores are left-handed.
10. The multi-throw crankshaft of claim 9 further comprising a plurality of crank pins with each crank pin having opposed straight bore portions and each straight bore portion including internal annular threads.
11. The multi-throw crankshaft of claim 10 wherein the internal annular threads are left-handed.
12. The multi-throw crankshaft of claim 11 wherein the internal annular threads are right-handed.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical transmission system over a given spectral band, the system comprising:
a given length (L0) of an optical transmission fiber having, at a median wavelength (\u03bb0) of the given spectral band, a given chromatic dispersion D0(\u03bb0) and a given slope of the chromatic dispersion S0(\u03bb0); and
at least two chromatic dispersion compensating fibers (DCFi) of respective length (Li), each dispersion compensating fiber having, at the median wavelength (\u03bb0), given values of chromatic dispersion Di(\u03bb0) and of slope of the chromatic dispersion Si(\u03bb0) that substantially satisfy the following equations:
D
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
D
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
S
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
S
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
2
wherein at least two of the dispersion compensating fibers have values for the slope of the slope of the dispersion SSi(\u03bb0) of opposite signs.
2. An optical transmission system according to claim 1, wherein the values for the slope of the slope of the dispersion (SSi) of the compensation fibers (DCFi) also substantially satisfy the following equation:
\uf603
\u2211
i
\u2062
(
SS
i
\u2061
(
\u03bb
0
)
\xb7
L
i
)
L
0
\uf604
<
0.002
\u2062
\u2062
ps
\u2062
\u2062
nm
3
\u2062
\u2062
km
.
3. An optical transmission system according to claim 1, wherein the given spectral band has a spectral width that is 40 nm or less.
4. An optical transmission system according to claim 1, wherein the given spectral band is chosen from among all or part of the C or C+ band, the L band, or the S band.
5. An optical transmission system according to claim 1, wherein, at the median wavelength (\u03bb0) of the given spectral band, the optical transmission fiber has a DOS value of less than 150 nm.
6. An optical transmission system over a spectral band having a spectral width of about 40 nm or less, the system comprising:
a given length (L0) of an optical transmission fiber having, at a median wavelength (\u03bb0) of the given spectral band, a given chromatic dispersion D0(\u03bb0) and a given slope of the chromatic dispersion S0(\u03bb0); and
at least two chromatic dispersion compensating fibers (DCFi) of respective length (Li), the chromatic dispersion compensating fibers in communication with the optical transmission fiber;
wherein each dispersion compensating fiber has, at the median wavelength (\u03bb0), given values of chromatic dispersion Di(\u03bb0) and of slope of the chromatic dispersion Si(\u03bb0) that substantially satisfy the following equations:
D
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
D
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
S
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
S
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
2
wherein at least two of the dispersion compensating fibers have values for the slope of the slope of the dispersion SSi(\u03bb0) of opposite signs; and
wherein the values for the slope of the slope of the dispersion (SSi) of the compensation fibers (DCFi) also substantially satisfy the following equation:
\uf603
\u2211
i
\u2062
(
SS
i
\u2061
(
\u03bb
0
)
\xb7
L
i
)
L
0
\uf604
<
0.002
\u2062
\u2062
ps
\u2062
\u2062
nm
3
\u2062
\u2062
km
.
7. An optical transmission system according to claim 6, wherein the given spectral band has a spectral width that is 35 nm or less.
8. An optical transmission system according to claim 6, wherein, at the median wavelength (\u03bb0) of the given spectral band, the optical transmission fiber has a DOS value of less than about 100 nm.
9. A method for compensating the chromatic dispersion of a given length (L0) of a transmission fiber over a given spectral band, the method comprising:
selecting at least two chromatic dispersion compensating fibers (DCFi) each having a given value for the slope of the slope of the dispersion (SSi) at a median wavelength (\u03bb0) of the given spectral band, at least two dispersion compensating fibers being chosen with values for the slope of the slope of the dispersion SSi(\u03bb0) of opposite signs; and
assembling given lengths (Li) of each dispersion compensating fiber;
wherein the dispersion compensating fibers are selected and the lengths of each selected fiber are chosen to substantially satisfy the following equation:
\uf603
\u2211
i
\u2062
(
SS
i
\u2061
(
\u03bb
0
)
\xb7
L
i
)
L
0
\uf604
<
0.002
\u2062
\u2062
ps
\u2062
\u2062
nm
3
\u2062
\u2062
km
.
10. The method for compensating the chromatic dispersion of claim 9, wherein the dispersion compensating fibers (DCFi) are selected to substantially satisfy the following equations:
D
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
D
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
S
0
\u2061
(
\u03bb
0
)
\xb7
L
0
+
\u2211
i
\u2062
(
S
i
\u2061
(
\u03bb
0
)
\xb7
Li
)
=
0
\u2062
\u2062
ps
\u2062
\u2062
nm
2
and wherein Di(\u03bb0) and Si(\u03bb0), respectively, are the values of dispersion and dispersion slope of the dispersion compensating fibers at the median wavelength (\u03bb0) of the given spectral band, and the transmission fiber of the length (L0) has, at the median wavelength (\u03bb0) of the given spectral band, a given chromatic dispersion D0(\u03bb0) and a given slope of the chromatic dispersion S0(\u03bb0).