Positively engaging shifting element which can be hydraulically or pneumatically actuated

摘要

The invention relates to a positively engaging shifting element which can be hydraulically or pneumatically actuated, comprising a hydraulically or pneumatically actuatable piston (I) having a piston compartment (2) containing a hydraulic medium or pressure medium, a pressure medium supply (6) for the piston (I), a jaw (3) and a mating jaw (4) with which the jaw (3) meshes when engaged. The engaging speed of the jaw (3) can be increased by decoupling the jaw (3) from the hydraulic or pneumatic volume flow when the jaws (3) and (4) are in a tooth butt position in relation to each other and by pretensioning the jaw (3) by means of a hydraulic or pneumatic pressure reservoir (7) that is actively connected to the piston (I) and that is connected to the pressure medium supply (6). The gap between the jaws, i.e. the window into which the jaw (3) can be engaged is maintained as narrow as possible in order for a tooth butt position of the jaws (3) and (4) in relation to each other being highly probable when the shift element is applied.

主权项

1. A form-fit control element to be activated in hydraulic or pneumatic manner, comprising:
a main piston hydraulically or pneumatically operable, having a piston compartment containing hydraulic medium or pneumatic medium, a pressure medium supply providing a volumetric flow to move the main piston, a first jaw and a second jaw into which the first jaw meshes when the first jaw and the second jaw engage, a hydraulic or pneumatic pressure reservoir that is connected to the main piston and the pressure medium supply, wherein the hydraulic or pneumatic pressure reservoir comprises
an accumulator piston, andan accumulator spring connecting to the accumulator piston, and wherein the piston compartment connects to the piston accumulator and the pressure medium supply in parallel, wherein, when the first jaw and the second jaw are in a tooth butt position with respect to each other so that the main piston is unable to move by the volumetric flow out of the pressure medium supply, the accumulator piston is moved by the volumetric flow so that hydraulic energy from the pressure medium supply is stored in the piston accumulator as spring energy, and wherein, when the first jaw engages with the second jaw from the tooth butt position, the spring energy is transferred to the piston as hydraulic energy in order to accelerate closing of the form-fit control element, guaranteeing that a bearing flank of the first jaw and a bearing flank of the second jaw are adequately overlapping.