Drive device provided with torque-limiting means
First Claim
1. A drive device for an engine-driven load comprising, in the drive direction:
- an engine;
a torque converter with an input shaft and an output shaft;
a continuously variable transmission unit with a primary shaft and a secondary shaft adapted to transmit torque with the aid of friction forces, the combination of the engine and the torque converter on the primary shaft of the transmission unit being capable of generating a nominal torque (Tp,nom) greater than the maximum slipping torque (Ts,max) of the continuously variable transmission unit; and
a limiting means operatively connected to at least one of the engine and torque converter to limit the torque (Tp) actually generated in operation by the combination of the engine and the torque converter on the primary shaft of the transmission unit to not exceed a defined limit level (Tq),wherein the engine and the torque converter are designed such that the nominal engine torque times the square root of the torque conversion factor (f) is approximately equal to the maximum slipping torque (Ts,max) of the transmission unit.
1 Assignment
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Accused Products
Abstract
A drive device for an engine-driven load, which in the drive direction successively includes an engine, a torque converter with an input shaft and an output shaft, and a continuously variable transmission unit with a primary shaft and a secondary shaft, between which torque can be transmitted with the aid of friction forces. The nominal torque which can be generated by the combination of engine and torque converter on the primary shaft of the transmission unit is greater than the maximum slipping torque of the transmission unit. The device is provided with devices which act on parts of the drive device in such a manner that the torque which can actually be generated in operation by the combination of engine and torque converter on the primary shaft of the transmission unit is limited. The limited level for the torque is controlled in such a manner that the torque generated is at most equal to the maximum slipping torque of the transmission unit.
19 Citations
12 Claims
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1. A drive device for an engine-driven load comprising, in the drive direction:
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an engine; a torque converter with an input shaft and an output shaft; a continuously variable transmission unit with a primary shaft and a secondary shaft adapted to transmit torque with the aid of friction forces, the combination of the engine and the torque converter on the primary shaft of the transmission unit being capable of generating a nominal torque (Tp,nom) greater than the maximum slipping torque (Ts,max) of the continuously variable transmission unit; and a limiting means operatively connected to at least one of the engine and torque converter to limit the torque (Tp) actually generated in operation by the combination of the engine and the torque converter on the primary shaft of the transmission unit to not exceed a defined limit level (Tq), wherein the engine and the torque converter are designed such that the nominal engine torque times the square root of the torque conversion factor (f) is approximately equal to the maximum slipping torque (Ts,max) of the transmission unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A drive device for an engine-driven load comprising, in the drive direction:
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an engine; a torque converter with an input shaft and an output shaft; a continuously variable transmission unit with a Primary shaft and a secondary shaft adapted to transmit torque with the aid of friction forces, the combination of the engine and the torque converter on the primary shaft of the transmission unit being capable of generating a nominal torque (Tp,nom) greater than the maximum slipping torque (Ts,max) of the continuously variable transmission unit; and a limiting means operatively connected to at least one of the engine and torque converter to limit the torque (Tp) actually generated in operation by the combination of the engine and the torque converter on the primary shaft of the transmission unit to not exceed a defined limit level (Tq), wherein the limiting means are activated in a low speed range of the rotational speed of the load.
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12. A drive device for an engine-driven load comprising, in the drive direction:
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an engine; a torque converter with an input shaft and an output shaft; a continuously variable transmission unit with a primary shaft and a secondary shaft adapted to transmit torque with the aid of friction forces, the combination of the engine and the torque converter on the primary shaft of the transmission unit being capable of generating a nominal torque (Tp,nom) greater than the maximum slipping torque (Ts,max) of the continuously variable transmission unit; and a limiting means operatively connected to at least one of the engine and torque converter to limit the torque (Tp) actually generated in operation by the combination of the engine and the torque converter on the primary shaft of the transmission unit to not exceed a defined limit level (Tg), in which the torque converter is designed with an adjustable torque conversion factor (f), and wherein the limiting means limit the torque conversion factor (f) of the torque converter.
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Specification