Automatic transmission with retarder
AssigneeDaimler-Benz Aktiengesellschaft
InventorsHans-Joachim M. Forster, Ulrich Eltze
Life of this patent
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Abstract
A transmission with a retarder as additional, preferably as third brake, especially an automatic transmission for motor vehicles in which the retarder is arranged on the output side of the transmission and the various transmission ratios of the transmission are engaged by way of free-wheeling devices which continuously remain in their operable position during the actuation of the retarder.
Claims86
A transmission arrangement for vehicles having a driving engine, the arrangement characterized in that a transmission is provided, the transmission includes an input means output means, and shifting means for selectively engaging the speeds of the transmission including free-wheeling means, in that a retarder means is provided and serves as an additional brake, the retarder means being disposed on the output side of the transmission, in that control means are provided for controlling the braking moment of the retarder means in dependence upon the magnitude of the rotational speed at the free-wheeling means of the engaged speed, and in that the free-wheeling means remain operable constantly with actuation of the retarder means.
A transmission with a retarder means as additional brake, characterized in that the transmission includes an input means and output means, in that the retarder means is arranged on the output side of the transmission, and in that shifting means are provided for selectively engaging the speeds of the transmission by way of free-wheeling means remaining operable constantly also with actuation of a retarder means, and in that control means for the retarder means are provided and operatively connected with control means of a driving engine in such a manner that the retarder means is engaged when the engine control means drops below a position corresponding to a driving torque zero, the engine control means including an actuating member having a center zero position, from which an actuation of said member in one direction effects an acceleration while an actuation of said member in the other direction effects a braking by the retarder means, and in that the actuating member is an engine control member, and the braking moment of the retarder means is control led substantially proportional to the travel of the engine control member when the latter moves below a position corresponding to a zero driving torque, and characterized in that the braking moment of the retarder means is controlled in dependence on the magnitude of the rotational speed difference at the free-wheeling means of the engaged speed.
A transmission with a transmission output means and a retarder means arranged at the output means of the transmission, in which at least one speed of the transmission is engaged by way of a free-wheeling means, characterized by control means for the retarder means operatively connected with control means of a driving engine in such a manner that the retarder means is engaged when the engine control means drops below a position corresponding to a driving torque zero.
A transmission with a transmission output means and a retarder means arranged at the output means of the transmission, in which at lest one speed of the transmission is engaged by way of a free-wheel means, characterized by control means for the retarder means operatively connected with control means for a driving engine in such a manner that the retarder means is engaged when the engine control means drops below a position corresponding to a driving torque zero, and characterized in that the braking amount of the retarder means is controlled in dependence on the magnitude of the rotational speed difference at the free-wheeling means of the engaged speed.
A transmission with a transmission output means and a retarder means arranged at the output means of the transmission, in which at least one speed of the transmission is engaged by way of a free-wheeling means, characterized by control means for the retarder means operatively connected with control means of a driving engine in such a manner that the retarder means is engaged when the engine control means drops below a position corresponding to a driving torque zero, and characterized in that with a hydraulic unit combined with the transmission, retarder means is controlled by rotational speed comparison as a function of rotational speed difference pump and turbine wheel of the hydraulic unit.
Dependencies are inferred from the claim text.