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Hydrostatic Transmission Contents • • • • • •
What is hydrostaic transmission Advantages of hydrostatic transmission Limitations of hydrostatic transmission Market trend for HST Layout with HST Tractive effort diagram (calculations from pump/motor performance) • Hydraulic circuit diagram
Advantages of HST • • • • •
Precise speeds for every operation Infinite no. of speeds Creeper speeds at fraction of miles per hour Simplicity of control High work efficiency
Limitations of HST • Low efficiency as compared to mechanical transmission. • Size of the pump and motor required will be huge if range needs to be eliminated. • High noise levels
What is HST • A HYDROSTATIC TRANSMISSION CONSISTS OF 1) HYDRAULIC PUMP 2) HYDRAULIC MOTOR • • •
TO CONTROL THE PUMP AND MOTOR DISPLACEMENT A SWASH PLATE IS USED. SWASH PLATE MOVEMENT IS CONNECTED TO PEDAL MOVEMENT VARYING THE SWASH PLATE ANGLE CHANGES THE TORQUE OUTPUT FROM THE MOTOR
HYDROSTATIC TRANSMISSION For compact tractors Key Benefit to customer: • Infinite number of speed range and hence better utilization of engine power. • Optimum speed for every operation intended. • Dampens drive line vibrations. • Single pedal operation hence comfortable to operate. Description:
Hydraulic pump and motor is coupled to the range gear box.
Infinite speed in each range is achieved by varying swash plate angle through foot pedal.
HYDROSTATIC TRANSMISSION WITH RANGE GEARS.
DATE: 29t h May 02 JD 4300 HST
PUMP MODEL MD 40. 6
MEDI UM RANGE
MOTOR MODEL MD 40. 6
NO. OF MOTORS 1
RELI EF ( PSI ) 6000
AVAI LABLE TRANSMI SSI ON I NPUT POWER:
CHARGE PRESS ( PSI ) 125 32. 2
PUMP PERFORMANCE SWASH ANGLE ( DEG) DI SPLACEMENT ( cc/ r ev) I NPUT SPEED ( RPM) I NPUT TORQUE ( kgm) OUTPUT FLOW ( l pm) I NPUT POWER ( HP) SYSTEM PRESSURE( kg/ cm2)
17. 0 40. 60 2700 8. 5 104. 1 32. 2 116. 3
15. 0 35. 58 2700 8. 5 90. 1 32. 2 132. 7
12. 0 28. 23 2700 8. 5 70. 9 32. 2 171. 1
9. 0 21. 03 2700 8. 5 51. 7 32. 2 222. 5
6. 0 13. 96 2700 8. 5 32. 9 32. 2 326. 1
3. 0 6. 96 2700 8. 5 14. 0 32. 2 413. 0
VOLUMETRI C EFFI CI ENCY TORSI ONAL EFFI CI ENCY OVERALL EFFI CI ENCY
0. 950 0. 880 0. 836
0. 938 0. 880 0. 825
0. 930 0. 900 0. 837
0. 910 0. 872 0. 794
0. 872 0. 848 0. 739
0. 747 0. 760 0. 568
MOTOR PERFORMANCE ( each mot or ) SWASH ANGLE ( DEG) DI SPLACEMENT ( cc/ r ev) OUTPUT SPEED ( RPM) OUTPUT TORQUE ( kgm) OUTPUT FLOW ( l pm) OUTPUT POWER ( HP)
17. 0 40. 60 2385. 5 6. 5 96. 8 21. 53
17. 0 40. 60 1975. 5 7. 4 80. 2 20. 34
17. 0 40. 60 1431. 5 9. 3 58. 1 18. 56
17. 0 40. 60 1018. 3 11. 6 41. 3 16. 56
17. 0 40. 60 501. 8 16. 2 20. 4 11. 37
17. 0 40. 60 34. 6 13. 3 1. 4 0. 64
VOLUMETRI C EFFI CI ENCY TORSI ONAL EFFI CI ENCY OVERALL EFFI CI ENCY
0. 930 0. 860 0. 800
0. 890 0. 860 0. 765
0. 820 0. 840 0. 689
0. 800 0. 810 0. 648
0. 620 0. 770 0. 477
0. 100 0. 500 0. 050
PUMP&MOTOR EFFI CI ENCY
0. 669
0. 632
0. 577
0. 514
0. 353
0. 028
VEHI CLE PERFORMANCE
TRACTI VE EFFORT ( kg) VEHI CLE SPEED ( kmph) DRAWBAR PULL ( kg) DRAWBAR POWER ( HP) GRADEABI LI TY ( %)
517. 6 10. 67 451. 9 17. 86 36. 97
GEAR RATI O OR FDR = LOAD RADI US ( m) = GEAR EFFI CI ENCY =
43. 41 0. 515 0. 95
590. 6 8. 84 524. 8 12. 37 44. 08
743. 7 6. 40 678. 0 11. 58 61. 35
932. 5 4. 55 866. 7 10. 53 90. 77
1299. 0 2. 24 1183. 5 7. 08 460. 98
ROLLI NG RESI ST. COEFF. = VEHI CLE WEI GHT ( kg) = ROLLI NG RESI ST. ( kg) =
1068. 5 0. 15 1002. 7 0. 41 125. 18 0. 050 1315 66
PERFORMANCE CURVE OF HST HST PERFORMANCE CURVE 4500
TRACTIVE
EFFORT(kg)
4000 3500 3000 2500 2000 1500 1000 500 0 0
4
8
12
16
20
24
VEHICLE SPEED (kmph)
Low range
Medium range
28
32
High range
What is hydrostaic transmission Advantages of hydrostatic transmission Limitations of hydrostatic transmission Market trend for HST Layout with HST Tractive effort diagram (calculations from pump/motor performance) • Hydraulic circuit diagram
Advantages of HST • • • • •
Precise speeds for every operation Infinite no. of speeds Creeper speeds at fraction of miles per hour Simplicity of control High work efficiency
Limitations of HST • Low efficiency as compared to mechanical transmission. • Size of the pump and motor required will be huge if range needs to be eliminated. • High noise levels
What is HST • A HYDROSTATIC TRANSMISSION CONSISTS OF 1) HYDRAULIC PUMP 2) HYDRAULIC MOTOR • • •
TO CONTROL THE PUMP AND MOTOR DISPLACEMENT A SWASH PLATE IS USED. SWASH PLATE MOVEMENT IS CONNECTED TO PEDAL MOVEMENT VARYING THE SWASH PLATE ANGLE CHANGES THE TORQUE OUTPUT FROM THE MOTOR
HYDROSTATIC TRANSMISSION For compact tractors Key Benefit to customer: • Infinite number of speed range and hence better utilization of engine power. • Optimum speed for every operation intended. • Dampens drive line vibrations. • Single pedal operation hence comfortable to operate. Description:
Hydraulic pump and motor is coupled to the range gear box.
Infinite speed in each range is achieved by varying swash plate angle through foot pedal.
HYDROSTATIC TRANSMISSION WITH RANGE GEARS.
DATE: 29t h May 02 JD 4300 HST
PUMP MODEL MD 40. 6
MEDI UM RANGE
MOTOR MODEL MD 40. 6
NO. OF MOTORS 1
RELI EF ( PSI ) 6000
AVAI LABLE TRANSMI SSI ON I NPUT POWER:
CHARGE PRESS ( PSI ) 125 32. 2
PUMP PERFORMANCE SWASH ANGLE ( DEG) DI SPLACEMENT ( cc/ r ev) I NPUT SPEED ( RPM) I NPUT TORQUE ( kgm) OUTPUT FLOW ( l pm) I NPUT POWER ( HP) SYSTEM PRESSURE( kg/ cm2)
17. 0 40. 60 2700 8. 5 104. 1 32. 2 116. 3
15. 0 35. 58 2700 8. 5 90. 1 32. 2 132. 7
12. 0 28. 23 2700 8. 5 70. 9 32. 2 171. 1
9. 0 21. 03 2700 8. 5 51. 7 32. 2 222. 5
6. 0 13. 96 2700 8. 5 32. 9 32. 2 326. 1
3. 0 6. 96 2700 8. 5 14. 0 32. 2 413. 0
VOLUMETRI C EFFI CI ENCY TORSI ONAL EFFI CI ENCY OVERALL EFFI CI ENCY
0. 950 0. 880 0. 836
0. 938 0. 880 0. 825
0. 930 0. 900 0. 837
0. 910 0. 872 0. 794
0. 872 0. 848 0. 739
0. 747 0. 760 0. 568
MOTOR PERFORMANCE ( each mot or ) SWASH ANGLE ( DEG) DI SPLACEMENT ( cc/ r ev) OUTPUT SPEED ( RPM) OUTPUT TORQUE ( kgm) OUTPUT FLOW ( l pm) OUTPUT POWER ( HP)
17. 0 40. 60 2385. 5 6. 5 96. 8 21. 53
17. 0 40. 60 1975. 5 7. 4 80. 2 20. 34
17. 0 40. 60 1431. 5 9. 3 58. 1 18. 56
17. 0 40. 60 1018. 3 11. 6 41. 3 16. 56
17. 0 40. 60 501. 8 16. 2 20. 4 11. 37
17. 0 40. 60 34. 6 13. 3 1. 4 0. 64
VOLUMETRI C EFFI CI ENCY TORSI ONAL EFFI CI ENCY OVERALL EFFI CI ENCY
0. 930 0. 860 0. 800
0. 890 0. 860 0. 765
0. 820 0. 840 0. 689
0. 800 0. 810 0. 648
0. 620 0. 770 0. 477
0. 100 0. 500 0. 050
PUMP&MOTOR EFFI CI ENCY
0. 669
0. 632
0. 577
0. 514
0. 353
0. 028
VEHI CLE PERFORMANCE
TRACTI VE EFFORT ( kg) VEHI CLE SPEED ( kmph) DRAWBAR PULL ( kg) DRAWBAR POWER ( HP) GRADEABI LI TY ( %)
517. 6 10. 67 451. 9 17. 86 36. 97
GEAR RATI O OR FDR = LOAD RADI US ( m) = GEAR EFFI CI ENCY =
43. 41 0. 515 0. 95
590. 6 8. 84 524. 8 12. 37 44. 08
743. 7 6. 40 678. 0 11. 58 61. 35
932. 5 4. 55 866. 7 10. 53 90. 77
1299. 0 2. 24 1183. 5 7. 08 460. 98
ROLLI NG RESI ST. COEFF. = VEHI CLE WEI GHT ( kg) = ROLLI NG RESI ST. ( kg) =
1068. 5 0. 15 1002. 7 0. 41 125. 18 0. 050 1315 66
PERFORMANCE CURVE OF HST HST PERFORMANCE CURVE 4500
TRACTIVE
EFFORT(kg)
4000 3500 3000 2500 2000 1500 1000 500 0 0
4
8
12
16
20
24
VEHICLE SPEED (kmph)
Low range
Medium range
28
32
High range
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