SIVRT geartrain
The SIVRT disclosed includes a unique, ordered geartrain; it allows a large-continuous range of input:output velocity ratios (forward or reverse). This range is controlled by fluid-coupled gearsets which direct the power flow to the output shaft. The SIVRT requires no torque converter or friction clutches and has been designed for fully-loaded work machines which must operate reliably at creep speeds for extended periods with 1-3 stop-reverse-stop-forward operations every minute of the workshift. The “clutchless” Vformer system disclosed herein provides a robust, heavy-duty, continuously-variable mechanical transmission especially designed and scaled for applications in vehicles and working machines which operate at creep speeds with frequently “stop-start-reverse” activity.
1. A geartrain comprising:
a first intermediate shaft (C);
a second intermediate shaft (D);
a sun gear ( 13 ) and a first gear ( 16 ) supported on the first intermediate shaft (C), wherein the first gear ( 16 ) engages a second gear ( 11 ) fixed on a first counter shaft (H), and the second gear ( 11 ) engages a third gear ( 12 ) fixed on a first auxiliary shaft (G);
a fourth gear ( 17 ) and a fifth gear ( 9 ) are supported on the second intermediate shaft (D), wherein the fourth gear ( 17 ) engages a sixth gear ( 10 ) fixed on a second auxiliary shaft (F);
an epicyclic ring gear ( 15 ) is driven by the fifth gear ( 9 ) and is supported by three or more idler gears ( 18 n ) and engages three or more planet gears ( 14 a to 14 c ) borne by a carrier (PC), wherein the three or more planet gears ( 14 a to 14 c ) engage the sun gear ( 13 ); and
an output shaft (E) is fixed and driven by the carrier (PC).
2. The geartrain of claim 1 , wherein a rotational input torque (T 1 ) and input power (P 1 ) is changed to a range of output power (P 2 ) in a same or opposite direction at the output shaft (E).
3. The geartrain of claim 1 , wherein the three or more idler gears ( 18 n ) comprises three to six idler gears.
4. The geartrain of claim 1 , further comprising three or more second counter shafts (Jn) support the three or more idler gears ( 18 n ).
5. The geartrain of claim 1 , further comprising:
a first fluid-coupled-gearset (FCG 1 ) coupled to the first auxiliary shaft (G);
a second fluid-coupled-gearset (FCG 2 ) coupled to the second auxiliary shaft (F); and
wherein the first and second fluid-coupled-gearsets (FCG 1 , FCG 2 ) control an output gear ratio of the output shaft (E) to an input shaft of an input geartrain.
6. The geartrain of claim 1 , further comprising an operator interface coupled to the geartrain that stops, starts or reverses the geartrain.
7. The geartrain of claim 1 , wherein an output torque on the output shaft (E) is between 0 and 100 times an input torque in either rotation direction.
8. The geartrain of claim 1 , wherein the geartrain does not include a band-clutch or a disc-clutch.
9. The geartrain of claim 1 , further comprising an input geartrain comprising:
a seventh gear ( 1 ) supported on an input shaft (AA);
a coupling comprising a first mating half (PA) engageable with a second mating half (PB);
a gyro-frame housing (GFa) supports a first bevel gear ( 3 a ), a second bevel gear ( 4 a ) and the second mating half (PB);
a eighth gear ( 2 ) fixed to the gyro-frame housing (GFa), wherein the eighth gear ( 2 ) is driven by the seventh gear ( 1 ), includes a concentric, tubular shaft extension supported independently on bearings and rotates around a shaft (BB);
the first bevel gear ( 3 a ) and the second bevel gear ( 4 a ) drive a third bevel gear ( 5 a ) and a fourth bevel gear ( 6 a ) within the gyro-frame housing (GFa);
the shaft (BB) connects the third bevel gear ( 5 a ) with a tenth gear ( 7 a ) which in turn drives a gear ( 8 ) fixed to the second intermediate shaft (D); and
the first intermediate shaft (C) is supported by a bearing through the gyro-frame housing (GFa) and is driven by the fourth bevel gear ( 6 a ).
10. The geartrain of claim 9 , wherein:
the first mating half (PA) is disengageable and slideably splined to the first intermediate shaft (C); and
the first mating half (PA) and the second mating-half (PB) are configured to lock the first intermediate shaft (C), the gyro-frame housing (GFa) and the eighth gear ( 2 ) together, which locks the shaft (BB) and the second intermediate shaft (D).
11. The geartrain of claim 9 , wherein the gyro-frame housing (GFa) receives an input torque (T 1 ) and delivers a predetermined torque to the first and second intermediate shafts (C) and (D).
12. The geartrain of claim 9 , further comprising a power source coupled to the input shaft (AA).
13. The geartrain of claim 1 , further comprising an input geartrain comprising:
an input shaft (A);
a coupling comprising a first mating half (PA) engageable with a second mating half (PB);
a gyro-frame housing (GFb) driven by the input shaft (A), wherein the gyro-frame housing (GFb) supports a fifth bevel gear ( 3 b ), a sixth bevel gear ( 4 b ) and the second mating half (PB);
the fifth bevel gear ( 3 b ) and the sixth bevel gear ( 4 b ) drive a seventh bevel gear ( 5 b ) and an eighth bevel gear ( 6 b ) within the gyro-frame housing (GFb);
an eleventh gear ( 7 b ) is fixed to the seventh bevel gear 5 ( b ), supported on a concentric tubular shaft (B) by bearings, and drives a gear ( 8 ) fixed to the second intermediate shaft (D); and
the eighth bevel gear ( 6 b ) drives the first intermediate shaft (C) which supports the first mating half (PA).
14. The geartrain of claim 13 , wherein
the first mating half (PA) is disengageable and slideably splined to the first intermediate shaft (C); and
the first mating half (PA) and the second mating-half (PB) are configured to lock the first intermediate shaft (C), the gyro-frame housing (GFb) and the concentric tubular shaft (B) together, which locks the second intermediate shaft (D).
15. The geartrain of claim 13 , wherein the gyro-frame housing (GFb) receives an input torque (T 1 ) and delivers a predetermined torque to the first and second intermediate shafts (C) and (D).
16. The geartrain of claim 13 , further comprising a power source coupled to the input shaft (A).
17. A method of operating a geartrain comprising:
providing the geartrain of claim 1 , the geartrain further comprising an input shaft coupled to the geartrain, a first fluid-coupled-gearset (FCG 1 ) coupled to the first auxiliary shaft (G), and a second fluid-coupled-gearset (FCG 2 ) coupled to the second auxiliary shaft (F);
turning the output shaft (E) in a same direction of the input shaft by activating the first fluid-coupled-gearset (FCG 1 ) and inactivating the second fluid-coupled-gearset (FCG 2 );
turning the output shaft (E) in an opposite direction of the input shaft by inactivating the first fluid-coupled-gearset (FCG 1 ) and activating the second fluid-coupled-gearset (FCG 2 ); and
neutralizing the output shaft (E) by inactivating the first fluid-coupled-gearset (FCG 1 ) and inactivating the second fluid-coupled-gearset (FCG 2 ).
18. A geartrain comprising:
a seventh gear ( 1 ) supported on an input shaft (AA);
a coupling comprising a first mating half (PA) engageable with a second mating half (PB);
a gyro-frame housing (GFa) supports a first bevel gear ( 3 a ), a second bevel gear ( 4 a ) and the second mating half (PB);
a eighth gear ( 2 ) fixed to the gyro-frame housing (GFa), wherein the eighth gear ( 2 ) is driven by the seventh gear ( 1 ), includes a concentric, tubular shaft extension supported independently on bearings and rotates around a shaft (BB);
the first bevel gear ( 3 a ) and the second bevel gear ( 4 a ) drive a third bevel gear ( 5 a ) and a fourth bevel gear ( 6 a ) within the gyro-frame housing (GFa);
the shaft (BB) connects the third bevel gear ( 5 a ) with a tenth gear ( 7 a ) which in turn drives a gear ( 8 ) fixed to a second intermediate shaft (D);
a first intermediate shaft (C) is supported by a bearing through the gyro-frame housing (GFa) and is driven by the fourth bevel gear ( 6 a );
a sun gear ( 13 ) and a first gear ( 16 ) supported on the first intermediate shaft (C), wherein the first gear ( 16 ) engages a second gear ( 11 ) fixed on a first counter shaft (H), and the second gear ( 11 ) engages a third gear ( 12 ) fixed on a first auxiliary shaft (G);
a fourth gear ( 17 ) and a fifth gear ( 9 ) are supported on the second intermediate shaft (D), wherein the fourth gear ( 17 ) engages a sixth gear ( 10 ) fixed on a second auxiliary shaft (F);
an epicyclic ring gear ( 15 ) is driven by the fifth gear ( 9 ) and is supported by three or more idler gears ( 18 n ) and engages three or more planet gears ( 14 a to 14 c ) borne by a carrier (PC), wherein the three or more planet gears ( 14 a to 14 c ) engage the sun gear ( 13 );
an output shaft (E) is fixed and driven by the carrier (PC);
a first fluid-coupled-gearset (FCG 1 ) coupled to the first auxiliary shaft (G); and
a second fluid-coupled-gearset (FCG 2 ) coupled to the second auxiliary shaft (F).
19. The geartrain of claim 18 , wherein the geartrain does not include a band-clutch or a disc-clutch.
20. A geartrain comprising:
an input shaft (A);
a coupling comprising a first mating half (PA) engageable with a second mating half (PB);
a gyro-frame housing (GFb) driven by the input shaft (A), wherein the gyro-frame housing (GFb) supports a fifth bevel gear ( 3 b ), a sixth bevel gear ( 4 b ) and the second mating half (PB);
the fifth bevel gear ( 3 b ) and the sixth bevel gear ( 4 b ) drive a seventh bevel gear ( 5 b ) and an eighth bevel gear ( 6 b ) within the gyro-frame housing (GFb);
an eleventh gear ( 7 b ) is fixed to the seventh bevel gear ( 5 b ), supported on a concentric tubular shaft (B) by bearings, and drives a gear ( 8 ) fixed to a second intermediate shaft (D);
the eighth bevel gear ( 6 b ) drives a first intermediate shaft (C) which supports the first mating half (PA);
a sun gear ( 13 ) and a first gear ( 16 ) supported on the first intermediate shaft (C), wherein the first gear ( 16 ) engages a second gear ( 11 ) fixed on a first counter shaft (H), and the second gear ( 11 ) engages a third gear ( 12 ) fixed on a first auxiliary shaft (G);
a fourth gear ( 17 ) and a fifth gear ( 9 ) are supported on the second intermediate shaft (D), wherein the fourth gear ( 17 ) engages a sixth gear ( 10 ) fixed on a second auxiliary shaft (F);
an epicyclic ring gear ( 15 ) is driven by the fifth gear ( 9 ) and is supported by three or more idler gears ( 18 n ) and engages three or more planet gears ( 14 a to 14 c ) borne by a carrier (PC), wherein the three or more planet gears ( 14 a to 14 c ) engage the sun gear ( 13 );
an output shaft (E) is fixed and driven by the carrier (PC);
a first fluid-coupled-gearset (FCG 1 ) coupled to the first auxiliary shaft (G); and
a second fluid-coupled-gearset (FCG 2 ) coupled to the second auxiliary shaft (F).
21. The geartrain of claim 20 , wherein the geartrain does not include a band-clutch or a disc-clutch.