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MEKANIKA TRAKTOR (BAB I + II, Macmillan)

MEKANIKA TRAKTOR (BAB I + II, Macmillan). Agus Haryanto. Klasifikasi Traktor Pertanian. Jumlah as * 1 – berjalan (hand tractor) * 2 – riding Jumlah as ( roda ) penggerak : * 1 (2) --- TWD, TWT * 2 (4) --- FWD, FWT Elemen penggerak : * Traktor roda karet

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MEKANIKA TRAKTOR (BAB I + II, Macmillan)

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  1. MEKANIKA TRAKTOR(BAB I + II, Macmillan) AgusHaryanto

  2. Klasifikasi Traktor Pertanian • Jumlah as * 1 – berjalan (hand tractor) * 2 – riding • Jumlah as (roda) penggerak: * 1 (2) --- TWD, TWT * 2 (4) --- FWD, FWT • Elemenpenggerak : * Traktorrodakaret * Crawler tractor • Penggunaanroda: * Traksi – konvensional * Propulsi/cultivasi (power tiller)

  3. Type Useful Power • Transmisi Traction – melaluigerbox (lihatgambar) * Menghasilkangeraklurus – menarikbajak * Power losses : < 10% • Transmisi PTO (power take-off) * menghasilkangrakputar – memutar rotary * Power losses : < 5% • TransmisiHidrolik (oli) * Menghasilkantekananhidrolik – pengaturan lower lingk * Power losses : moderate, acceptable

  4. Sistem Transmisi Daya Traktor

  5. PeralatanTraksi

  6. Roda • Funtion: * support the tractor weight, limit the sinkage and the resultant rolling resistance. * engage with soil, transmit the traction, limit slip * provide ground ability (springing and shock absorption) • Variables: * size (diameter and width): determines tractive capacity and rolling resistance * strength (ply rating): determines pressure and weight that the tyre can carry. * tread pattern (thread): determines the engagement with the surface.

  7. TRACTOR MECHANICS (NO LOSES) • Speed Analysis

  8. TRACTOR MECHANICS (NO LOSES) • Torque Analysis

  9. TRACTOR MECHANICS (NO LOSES) • Power Analysis

  10. TRACTOR MECHANICS (W/ LOSES) • Speed Analysis

  11. TRACTOR MECHANICS (W/ LOSES) • Power Analysis H = P + R P

  12. TRACTOR MECHANICS • Tractive Efficiency

  13. TRACTOR MECHANICS • Tractive Efficiency

  14. TRACTOR MECHANICS • Transmission Efficiency For good quality gears the maximum efficiency is about 98% per pair of gears; 3 pairs of gears in the change transmission and another 2 pairs in the differential / final drive, results in the maximum efficiency of (0.98)^5 = 90%.

  15. TRACTOR MECHANICS • Engine Efficiency The maximum value for engine efficiency is dependent on and strictly limited by the thermodynamics of the engine processes. A maximum value of about 35% for a diesel engine can be expected.

  16. TRACTOR MECHANICS • Overall Efficiency

  17. TRACTOR MECHANICS • Tractive coefficient (pull - weight ratio)

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