CA1227666A - High torque drive means for two very close shafts which are also subjected to strong axial thrusts and application thereof of a double screw extruder - Google Patents
High torque drive means for two very close shafts which are also subjected to strong axial thrusts and application thereof of a double screw extruderInfo
- Publication number
- CA1227666A CA1227666A CA000457276A CA457276A CA1227666A CA 1227666 A CA1227666 A CA 1227666A CA 000457276 A CA000457276 A CA 000457276A CA 457276 A CA457276 A CA 457276A CA 1227666 A CA1227666 A CA 1227666A
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- gear
- drive
- shafts
- driving
- driven
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Abstract
_ STRICT OF THE DISCLOSURE
It is provided, according to the present invention, that two very close parallel shafts rotating in the same or opposite direction, each fitted with a gear, are rotated each of them by means of at least one or more drive members which act on the periphery zone of each of said gears.
In an application to a double screw extrude, the housing containing the extruding screws is directly connected with the support of the thrust bearings, without urging the drive box. Said connection is obtained by means of tie rods passing through said drive box and preferably within the shafts on which the final gears of the drive element are mounted
It is provided, according to the present invention, that two very close parallel shafts rotating in the same or opposite direction, each fitted with a gear, are rotated each of them by means of at least one or more drive members which act on the periphery zone of each of said gears.
In an application to a double screw extrude, the housing containing the extruding screws is directly connected with the support of the thrust bearings, without urging the drive box. Said connection is obtained by means of tie rods passing through said drive box and preferably within the shafts on which the final gears of the drive element are mounted
Description
iffy "HIGH TORQUE DRIVE MEANS FOR TWO VERY COO E SHAFTS WHICH ARE Also SUBJECTED TO STRONG AXIAL THRUSTS AND APPLICATION THEREOF TO A
_ _ _ DOUBLE SCREW EXTRUDE"
This invention relates to drive means capable ox moving a set of two shafts arranged at a close distance iron each other, either parallel or with converting axes, being said shafts subjected to strong axial thrusts. These shafts are used, for example, in a double screw extrude for plastic materials.
In the case of two adjacent shafts moving in opposite 10. direction to each other, the simplest way for rotating them is to transmit the entire torque of the motor only to one of the two shafts, and then impart a rotation to the second shaft by a pair of identical gears, each one keyed to each of the two shafts, such as to mesh with the other gear. On the other hand, when the shafts rotate in a same direction, the rotation imparted to the first shaft, always by a single motor, is transmitted to the second shaft by means of an intermediate gear.
However, in these embodin~nts, the high speed of rotation of the shafts leads to a severe wear and to a very short 20- life of the plasticizing screws. On the other hand a low speed would cause high torques and accordingly occasional breakage. Moreover, being the shaft distance very small, the gears must have very small pitch diameters.
In the late few years, two ways have been followed to overcome this drawback.
The first way consists in mixing shafts carrying conical extruding screws, so that at Skye distance run the cone lZ2~6~i~
apex the gears may have larger dimensions. However, this complicates the whole construction.
A second approach was to separate the shaft actuation providing a reduction unit with two outlets each of which imparts the movement to the free end of each shaft, that is to the end opposite to the one carrying the screw. The disadvantage of this system is that the two very close shafts, subjected to a strong torsion become very long in order to leave along their axis the necessary space for the housing of the thrust bearings. These are usually positioned in such a way that each thrust bearing of a shaft is offset with respect to thrust bearing of the other. Therefore this solution is still not acceptable, because the shafts, for resisting the torsional stress, must greatly increase their diameters.
Attempts were also made to increase the gear sturdiness by lengthening the latter or increasing their number. However, this also considerably adds to costs.
Therefore, it is the object of an aspect of the present invention to provide a structurally economical solution to the problem of driving two close parallel or converging shafts arranged at a close distance from each other which are also subjected to strong axial thrusts.
Various aspects of the invention are as follows:
An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear; and synchronizing means, secured on each respective shaft, for constraining each of said two closely spaced shafts to rotate at the same speed.
An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
B
i227666 two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear;
synchronizing means for constraining each of said two closely spaced shafts to rotate at the same speed;
and said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear.
An apparatus rotationally driving two closely spaced shafts comprising:
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shaft;
a third drive gear and a fourth drive gear, said third drive gear and said fourth drive gear being for directly driving said second driven gear; and a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear, whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second driven gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to be reduced in magnitude.
An apparatus for rotationally driving two closely spaced shafts, comprising:
a first driven gear on a first of said shafts;
B
2b ~2~:7666 a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shafts;
a third drive gear and a fourth drive gear, said drive gear and said fourth drive gear being for directly driving said second driven gear;
a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear;
a synchronizing means for constraining each of said closely spaced shafts to rotate at the same speed; and said drive means each include a terminating gear for driving said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear;
whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second drive gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to minimize stresses.
A preferred solution provides that the drive members B
~ZZ76 are carried out by units completely independent from one another, that is having fully distinct motors.
In this case, preferably the use is contemplated of epicyclical reduction units which are readily commercially available.
In the proposed drive application to a double screw extrude for plastic materials, it is preferably provided that the housing containing the extruding screws is directly connected with 10- the support of the thrust bearings, without over stressing the drive box. Preferably, said connection is obtained by means of tie rods passing through said drive box.
For the rotation of two shafts rotating in a same direction, it is provided that the two gears mounted on such shafts are slightly spaced apart from each other, while the drive members are synchronized by an idle gear meshing therewith.
If the shafts are convergent it is possible to carry out all the drive members with conical gears which mesh with the respective conical gears of each shaft. It is also possible to 20- provide on each shaft two cylindrical gears which do not mesh with one another; they will be moved by at least two drive members terminating with a cylindrical gear meshing with the said respective cylindrical gear.
The invention will now be explained by an exemplary embodiment as shown in the accompanying drawings, in which:
Fig. 1 is a schematic perspective view of a drive means according to the present invention, in which the two shafts rotate in opposite direction;
Fig. 2 is a schematic side view of the same drive _ 4 _ ~Z~7666 means, in which also one of the two extruding screws is shown; and Fig. 3 is a schematic perspective view of another embodiment, in which the two shafts are caused to rotate in a same direction.
Figs. 4 and 5 are views of two further embodiments obtained on the converging shafts.
Referring first to Fig. 1, it will be seen that reference numerals 1 and 2 denote the two synchronized parallel 10. counter-rotating shafts, which are arranged at a very close distance from each other. Meshing gears 3 and 4, are mounted on each of the shafts. According to the present invention, rotation is imparted to each of such gears 3 and 4 at least by means of two drive members.
Two torques act upon gear 3 by means of gears 6 and 7, which are located in suitable zones on the circumference of gear 3, to limit the resulting thrust on said gear 3. Gear 4 is driven by two further drive members terminating with gears 8 and 9, respectively. In the particular em w dominate of Fig. 1, the drive members are gears driven 20- by other gears 10, 11, 12 and 13, respectively, which in turn are driven by independent motors This solution allows a reduced dimensioning of the length of gears 3 and 4 since the latter, serving only for synchronization of the two shafts, do not transmit the full power.
Moreover, a good power division is obtained for the power supplied to each of the gears, as each torque is applied to the respective gear 3 or 4 at spaced apart peripheral zones such as to minimize stresses.
Referring new to Fig. 2, in which an extrude has been schematically shown, it will be seen that the screws 15 have 30 been wormed on the shafts 1 and 2, although only one screw is shown 1~2~6~i in Fig. 2. The four gears 10, 11, 12 and 13 (of which only two are shown in Fig. 2) are connected to~çpicyclical reduction units 23 and 24~ which are driven by motors 25 and 26, respectively.
The shafts 1 and 2 must be supported by a series of axial thrust bearings 16, the strain of which has to be supported by the support 17. The axial strain caused by the extrusion pressure of the plastic material has to be supported by the housing 18 containing the extrude screws 15. According to the invention, it is provided that said housing 18 and support 17 are directly connected 10- to each other, for example by tie rods 19 and 20 which conveniently are caused to pass through hollow shafts 21 carrying the gears 6, 7, 8-and 9. Thus, the drive box 22, containing the gears 3 to 13, is released of any stress due to these considerable strains.
Referring now to Fig. 3, it will be seen that also therein the same reference numerals 1 and 2 are used to indicate two synchronized parallel shafts which rotate in a same direction and are arranged at a very close distance. Each of the shafts has gears 3 and 4 mounted thereon, but not meshing with each other. As for the embodiment of Fig. 1, it is provided that motion is given to each of 20- said gears 3 and 4 at least by means of two drive members. TWO
torques are caused to act upon gear 3 by means of gear 6 and gear 7, which will be arranged in suitable zones on the circumference of gear 3 to limit the resulting thrust on said gear 3. Gear 4 is driven by two further drive members terminating with gears 8 and 9, respectively. Also in this case, the drive members are gears driven by further gears 10, 11, 12 and 13, respectively, which in turn are driven by independent motors.
In this case, synchronism between said shafts 1 and 2 - 6 _ ~2~76~
is provided by gear 30 meshing with gears 6 and 8 forming part of the drive members operating the two gears 3 and 4, respectively.
Also in this case, the dimensioning of gears 3 and 4 is much reduced, since such gears serve only to transmit the power share assigned thereto.
Fig. 4 shows two converging shafts 31 and 32 on which two conical gears 35 and 34 respectively are mounted meshing with each other. On each of these, two drive members act, by means of gears 36, 37, 38, 39, also conical.
10. In Fig. 5 a further embodiment is shown in which the converging shafts 31 and 32 are each provided with a cylindrical gear 43 and 44, not meshing one with the other, and with meshing synchronization gear 35 and 45. The gears 43 and 44 are each driven by two driving members which act by means of their final gear 46, 47, 48, 40. In this case the driving means can be all carried out with cylindrical gears.
20.
_ _ _ DOUBLE SCREW EXTRUDE"
This invention relates to drive means capable ox moving a set of two shafts arranged at a close distance iron each other, either parallel or with converting axes, being said shafts subjected to strong axial thrusts. These shafts are used, for example, in a double screw extrude for plastic materials.
In the case of two adjacent shafts moving in opposite 10. direction to each other, the simplest way for rotating them is to transmit the entire torque of the motor only to one of the two shafts, and then impart a rotation to the second shaft by a pair of identical gears, each one keyed to each of the two shafts, such as to mesh with the other gear. On the other hand, when the shafts rotate in a same direction, the rotation imparted to the first shaft, always by a single motor, is transmitted to the second shaft by means of an intermediate gear.
However, in these embodin~nts, the high speed of rotation of the shafts leads to a severe wear and to a very short 20- life of the plasticizing screws. On the other hand a low speed would cause high torques and accordingly occasional breakage. Moreover, being the shaft distance very small, the gears must have very small pitch diameters.
In the late few years, two ways have been followed to overcome this drawback.
The first way consists in mixing shafts carrying conical extruding screws, so that at Skye distance run the cone lZ2~6~i~
apex the gears may have larger dimensions. However, this complicates the whole construction.
A second approach was to separate the shaft actuation providing a reduction unit with two outlets each of which imparts the movement to the free end of each shaft, that is to the end opposite to the one carrying the screw. The disadvantage of this system is that the two very close shafts, subjected to a strong torsion become very long in order to leave along their axis the necessary space for the housing of the thrust bearings. These are usually positioned in such a way that each thrust bearing of a shaft is offset with respect to thrust bearing of the other. Therefore this solution is still not acceptable, because the shafts, for resisting the torsional stress, must greatly increase their diameters.
Attempts were also made to increase the gear sturdiness by lengthening the latter or increasing their number. However, this also considerably adds to costs.
Therefore, it is the object of an aspect of the present invention to provide a structurally economical solution to the problem of driving two close parallel or converging shafts arranged at a close distance from each other which are also subjected to strong axial thrusts.
Various aspects of the invention are as follows:
An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear; and synchronizing means, secured on each respective shaft, for constraining each of said two closely spaced shafts to rotate at the same speed.
An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
B
i227666 two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear;
synchronizing means for constraining each of said two closely spaced shafts to rotate at the same speed;
and said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear.
An apparatus rotationally driving two closely spaced shafts comprising:
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shaft;
a third drive gear and a fourth drive gear, said third drive gear and said fourth drive gear being for directly driving said second driven gear; and a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear, whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second driven gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to be reduced in magnitude.
An apparatus for rotationally driving two closely spaced shafts, comprising:
a first driven gear on a first of said shafts;
B
2b ~2~:7666 a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shafts;
a third drive gear and a fourth drive gear, said drive gear and said fourth drive gear being for directly driving said second driven gear;
a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear;
a synchronizing means for constraining each of said closely spaced shafts to rotate at the same speed; and said drive means each include a terminating gear for driving said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear;
whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second drive gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to minimize stresses.
A preferred solution provides that the drive members B
~ZZ76 are carried out by units completely independent from one another, that is having fully distinct motors.
In this case, preferably the use is contemplated of epicyclical reduction units which are readily commercially available.
In the proposed drive application to a double screw extrude for plastic materials, it is preferably provided that the housing containing the extruding screws is directly connected with 10- the support of the thrust bearings, without over stressing the drive box. Preferably, said connection is obtained by means of tie rods passing through said drive box.
For the rotation of two shafts rotating in a same direction, it is provided that the two gears mounted on such shafts are slightly spaced apart from each other, while the drive members are synchronized by an idle gear meshing therewith.
If the shafts are convergent it is possible to carry out all the drive members with conical gears which mesh with the respective conical gears of each shaft. It is also possible to 20- provide on each shaft two cylindrical gears which do not mesh with one another; they will be moved by at least two drive members terminating with a cylindrical gear meshing with the said respective cylindrical gear.
The invention will now be explained by an exemplary embodiment as shown in the accompanying drawings, in which:
Fig. 1 is a schematic perspective view of a drive means according to the present invention, in which the two shafts rotate in opposite direction;
Fig. 2 is a schematic side view of the same drive _ 4 _ ~Z~7666 means, in which also one of the two extruding screws is shown; and Fig. 3 is a schematic perspective view of another embodiment, in which the two shafts are caused to rotate in a same direction.
Figs. 4 and 5 are views of two further embodiments obtained on the converging shafts.
Referring first to Fig. 1, it will be seen that reference numerals 1 and 2 denote the two synchronized parallel 10. counter-rotating shafts, which are arranged at a very close distance from each other. Meshing gears 3 and 4, are mounted on each of the shafts. According to the present invention, rotation is imparted to each of such gears 3 and 4 at least by means of two drive members.
Two torques act upon gear 3 by means of gears 6 and 7, which are located in suitable zones on the circumference of gear 3, to limit the resulting thrust on said gear 3. Gear 4 is driven by two further drive members terminating with gears 8 and 9, respectively. In the particular em w dominate of Fig. 1, the drive members are gears driven 20- by other gears 10, 11, 12 and 13, respectively, which in turn are driven by independent motors This solution allows a reduced dimensioning of the length of gears 3 and 4 since the latter, serving only for synchronization of the two shafts, do not transmit the full power.
Moreover, a good power division is obtained for the power supplied to each of the gears, as each torque is applied to the respective gear 3 or 4 at spaced apart peripheral zones such as to minimize stresses.
Referring new to Fig. 2, in which an extrude has been schematically shown, it will be seen that the screws 15 have 30 been wormed on the shafts 1 and 2, although only one screw is shown 1~2~6~i in Fig. 2. The four gears 10, 11, 12 and 13 (of which only two are shown in Fig. 2) are connected to~çpicyclical reduction units 23 and 24~ which are driven by motors 25 and 26, respectively.
The shafts 1 and 2 must be supported by a series of axial thrust bearings 16, the strain of which has to be supported by the support 17. The axial strain caused by the extrusion pressure of the plastic material has to be supported by the housing 18 containing the extrude screws 15. According to the invention, it is provided that said housing 18 and support 17 are directly connected 10- to each other, for example by tie rods 19 and 20 which conveniently are caused to pass through hollow shafts 21 carrying the gears 6, 7, 8-and 9. Thus, the drive box 22, containing the gears 3 to 13, is released of any stress due to these considerable strains.
Referring now to Fig. 3, it will be seen that also therein the same reference numerals 1 and 2 are used to indicate two synchronized parallel shafts which rotate in a same direction and are arranged at a very close distance. Each of the shafts has gears 3 and 4 mounted thereon, but not meshing with each other. As for the embodiment of Fig. 1, it is provided that motion is given to each of 20- said gears 3 and 4 at least by means of two drive members. TWO
torques are caused to act upon gear 3 by means of gear 6 and gear 7, which will be arranged in suitable zones on the circumference of gear 3 to limit the resulting thrust on said gear 3. Gear 4 is driven by two further drive members terminating with gears 8 and 9, respectively. Also in this case, the drive members are gears driven by further gears 10, 11, 12 and 13, respectively, which in turn are driven by independent motors.
In this case, synchronism between said shafts 1 and 2 - 6 _ ~2~76~
is provided by gear 30 meshing with gears 6 and 8 forming part of the drive members operating the two gears 3 and 4, respectively.
Also in this case, the dimensioning of gears 3 and 4 is much reduced, since such gears serve only to transmit the power share assigned thereto.
Fig. 4 shows two converging shafts 31 and 32 on which two conical gears 35 and 34 respectively are mounted meshing with each other. On each of these, two drive members act, by means of gears 36, 37, 38, 39, also conical.
10. In Fig. 5 a further embodiment is shown in which the converging shafts 31 and 32 are each provided with a cylindrical gear 43 and 44, not meshing one with the other, and with meshing synchronization gear 35 and 45. The gears 43 and 44 are each driven by two driving members which act by means of their final gear 46, 47, 48, 40. In this case the driving means can be all carried out with cylindrical gears.
20.
Claims (20)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear; and synchronizing means, secured on each respective shaft, for constraining each of said two closely spaced shafts to rotate at the same speed.
a driven gear on each shaft;
two respective drive gears for directly driving each said driven gear;
a separate drive means for driving each respective drive gear; and synchronizing means, secured on each respective shaft, for constraining each of said two closely spaced shafts to rotate at the same speed.
2. The apparatus of claim 1, wherein said synchronizing means includes means for constraining said shafts to rotate in opposite directions.
3. The apparatus of claim 1, wherein said synchronizing means comprises inter engaging teeth of said driven gears.
4. The apparatus of claim 1, wherein said synchronizing means includes means for constraining said shafts to both rotate in one direction.
5. An apparatus rotationally driving two closely spaced shafts, comprising:
a driven gear on each shaft;
two respective drive gears for directly driving each said driven Lear;
a separate drive means for driving each respective drive gear;
synchronizing means for constraining each of said two closely spaced shafts to rotate at the same speed; and said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear.
a driven gear on each shaft;
two respective drive gears for directly driving each said driven Lear;
a separate drive means for driving each respective drive gear;
synchronizing means for constraining each of said two closely spaced shafts to rotate at the same speed; and said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear.
6. The apparatus of claim 1, wherein said shafts are positioned so as to converge towards one another, further comprising a conical gear on each of said shafts, said conical gears meshing with one another.
7. The apparatus of claim 1, wherein said shafts are positioned so as to converge towards one another, and said driven gears are conical, said driven gears being sized and positioned so as to mesh with one another.
8. The apparatus of claim 1, wherein each drive means includes a respective independent motor.
9. The apparatus of claim 1, wherein said shafts are parallel.
10. An apparatus rotationally driving two closely spaced shafts, comprising:
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive Bear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shaft;
a third drive gear and a fourth drive gear, said third drive gear and said fourth drive gear being for directly driving said second driven gear; and a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear, whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second driven gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to be reduced in magnitude.
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive Bear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shaft;
a third drive gear and a fourth drive gear, said third drive gear and said fourth drive gear being for directly driving said second driven gear; and a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear, whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second driven gear by said third drive gear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to be reduced in magnitude.
11. The apparatus of claim 10 further comprising synchronizing means for constraining each of said closely spaced shafts to rotate at the same speed.
12. The apparatus of claim 11, wherein said synchronizing means includes means for constraining said shafts to rotate in opposite directions.
13. The apparatus of claim 11, wherein said synchronizing means comprises inter engaging teeth of said driven gears.
14. The apparatus of claim 11, wherein said synchronizing means includes means for constraining said shafts to both rotate in one direction.
15. The apparatus of claim 11, wherein said drive means each include a terminating gear for driving said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating Lear of one drive means of each driven gear.
16. The apparatus of claim lo wherein said shafts are positioned so as to converge towards one another, further comprising a conical gear on each of said shafts, said conical gears meshing with one another.
17. The apparatus of claim 10, wherein said shafts are positioned so as to converge towards one another, and said driven gears are conical, said driven gears being sized and positioned so as to mesh with one another.
18. The apparatus of claim 10, wherein each drive means includes a respective independent motor.
19. The apparatus of claim 10, wherein said shafts are parallel.
20. An apparatus for rotationally driving two closely spaced shafts, comprising:
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shafts;
a third drive gear and a fourth drive gear, said drive gear and said fourth drive gear being for directly driving said second driven gear;
a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear;
a synchronizing means for constraining each of said closely spaced shafts to rotate at the same speed; and said drive means each include a terminating gear for driving said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear;
whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second drive gear by said third drive Lear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to minimize stresses.
a first driven gear on a first of said shafts;
a first drive gear and a second drive gear, said first drive gear and said second drive gear being for directly driving said first driven gear;
a first independent drive means for driving said first drive gear and a second independent drive means for driving said second drive gear;
a second driven gear on a second of said shafts;
a third drive gear and a fourth drive gear, said drive gear and said fourth drive gear being for directly driving said second driven gear;
a third independent drive means for driving said third drive gear and a fourth independent drive means for driving said fourth drive gear;
a synchronizing means for constraining each of said closely spaced shafts to rotate at the same speed; and said drive means each include a terminating gear for driving said respective drive gears and said synchronizing means comprises an idler gear, said idler gear engaging one terminating gear of one drive means of each driven gear;
whereby torque applied to said first driven gear by said first drive gear and said second drive gear and to said second drive gear by said third drive Lear and by said fourth drive gear at points along the circumference of said first driven gear and said second driven gear, respectively is distributed so as to minimize stresses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000457276A CA1227666A (en) | 1984-06-22 | 1984-06-22 | High torque drive means for two very close shafts which are also subjected to strong axial thrusts and application thereof of a double screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000457276A CA1227666A (en) | 1984-06-22 | 1984-06-22 | High torque drive means for two very close shafts which are also subjected to strong axial thrusts and application thereof of a double screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1227666A true CA1227666A (en) | 1987-10-06 |
Family
ID=4128151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000457276A Expired CA1227666A (en) | 1984-06-22 | 1984-06-22 | High torque drive means for two very close shafts which are also subjected to strong axial thrusts and application thereof of a double screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1227666A (en) |
-
1984
- 1984-06-22 CA CA000457276A patent/CA1227666A/en not_active Expired
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