Transmission device with plurality of transmission ratios

Abstract

A transmission device has a plurality of transmission ratios that can be engaged and disengaged via a plurality of switching levers, which can be adjusted by hydraulically actuatable piston cylinder devices (2 to 6), wherein the freely adjustable operating pressure (p_B) in the region of the valves (16, 17) can be exerted in the region of the piston chamber of the piston cylinder device (2 to 6) via a valve device (15) and a reversing valve, respectively, and the piston chambers (2A to 6B) of the piston cylinder devices (2 to 6) form functional connection with a low pressure region (52) through the reversing valve and a pre-filling valve or through the valve device (15), the valve device (15) and the valves (16, 17). The reversing valves (2C to 6D) are respectively provided with spring means, by which the reversing valves (2C to 6D) are held in an operating state that connects the piston chambers (2A to 6B) to the low-pressure region (52) by the pre-filling valve (32, 33) when the operating pressure (p_B) is below a pressure threshold.

Description

technical field [0001] The invention relates to a transmission arrangement according to the type specified in the preamble of claim 1 , which has a plurality of transmission ratios which can be engaged and disengaged via a plurality of shift levers which can be switched via a plurality of shift levers. It is adjusted by a hydraulically operated piston-cylinder device. Background technique [0002] A transmission device is known from DE 10 2013 222 989 A1 with a plurality of transmission ratios which can be engaged and disengaged via a plurality of shift levers which can be adjusted by means of a plurality of hydraulically actuatable piston-cylinder arrangements. An actuating pressure can be applied in the region of the piston-cylinder arrangement via the valve arrangement. The valve arrangement comprises three pilot-controlled switching valves connected to one another via lines, which each have a first switching position or a second switching position for forming the transm...

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Problems solved by technology

[0003] However, it is disadvantageous here that the further valve unit comprises a plurality of ball switch valves, which connect the piston chamber to the prefill valve or to the valve arrangement depending on the respectively acting pressure and are thus disadvantageously can have an indeterminate operating state during the course of an operating state which in turn leads to an undesirably high leakage volume flow

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