Driving system for engine auxiliary power
Systems and methods for driving engine auxiliaries are provided. A front drive power take-off system is used to drive an auxiliary unit mounted on the engine. A pulley and belt drive assembly includes a drive sprocket mounted on the engine crankshaft, a toothed belt interconnecting the drive sprocket, and a pulley mounted on a drive shaft of the auxiliary unit to transmits power from crankshaft to the auxiliary unit.
1. A system for driving a hydraulic pump for powering auxiliaries on a vehicle, comprising:
an engine comprising a vehicle drive system end comprising a vehicle drive system and an auxiliary drive system end, wherein the engine comprises an engine block and a crankshaft,
a drive sprocket mounted on a portion of the crankshaft extending from the auxiliary drive system end of the engine;
an auxiliary shaft for driving the hydraulic pump for powering vehicle auxiliaries, wherein the hydraulic pump is mounted on a side of the engine block between the the auxiliary drive system end and the vehicle drive system end of the block, and wherein the auxiliary shaft extends from the hydraulic pump toward the auxiliary drive system end of the engine and is spaced in fixed and parallel relation to the crankshaft;
an auxiliary pulley mounted on the auxiliary shaft that is adapted for driving the hydraulic pump;
a toothed drive belt interconnecting the drive sprocket and the auxiliary pulley to transmit power from the drive sprocket to the pulley; and
a support structure that supports the crankshaft and the auxiliary shaft against a transverse load asserted by the drive belt,
wherein the system is capable of transmitting substantially all of the power from the engine to the hydraulic pump.
2. The system of claim 1 , wherein the toothed belt is a synchronous belt.
3. The system of claim 1 , wherein at least 70% of the engine horsepower and crankshaft torque is transferred to the hydraulic pump.
4. The system of claim 1 , wherein the power requirement of the hydraulic pump is over 50 horsepower.
5. The system of claim 1 , wherein the drive sprocket is press fit on to the crankshaft.
6. The system of claim 1 , wherein the auxiliary shaft operates at greater than 2000 RPM.
7. The system of claim 1 , wherein the lateral load on the crankshaft is at least 200 pounds.
8. The system of claim 1 , wherein the system is capable of delivering at least 80kW at 3000 RPM of the auxiliary shaft.
9. The system of claim 1 , further comprising a second sprocket mounted adjacent the drive sprocket and a belt mounted on the second sprocket interconnecting the second sprocket and at least one second pulley that drives at least one vehicle accessory.