Transmission shift device with variable gate blocking force

Abstract

The present invention relates to a transmission shift device (30) for a transmission (6) having a range group transmission (14) and a selector lever (16) with a superposed H-shaped shift pattern, in which transmission shift device (30) a shift- and selector shaft (32) is operatively connected at one end (34) to the selector lever (16) and at the other end to transmission-side shift means, having a blocking device which can be actuated by means of a pressure medium and which prevents, or at least notifies a driver of a motor vehicle of, an inadvertent selection of transmission gears in the event of a range group shift, in such a way that the shift- and selector shaft (32) can, in the event of a range group shift, be displaced autonomously from one shift gate (G5-G6) to the shift gate (G3-G4) of the two next lowest gears (G3, G4).; Said transmission shift device is also designed, so as to avoid undesired incorrect shifts in the event of a range group shift and to permit downshifts across several gear stages, in such a way that the shift- and selector shaft (32) can be displaced from one shift gate (G5-G6) to the shift gate (G3-G4) of the next lowest gears with a force (F1 to F2) which varies over the displacement travel.

Description

technical field [0001] The invention relates to a transmission shifting device according to the preamble of claim 1 . Background technique [0002] The transmissions of large cargo (operating) vehicles can usually be divided into main transmissions, split-type auxiliary transmissions and sub-regional auxiliary transmissions. This type of transmission has a shifting device supported by a pneumatic device, which can be shifted pneumatically in the splitter and splitter, and manually by the driver in the main transmission. In some cases the applied force can be supported by pneumatics. [0003] Electronic control units are now increasingly being used to control conventional vehicle transmissions. This arrangement also serves, inter alia, to prevent shifting in the transmission, ie, due to other conditions, a particularly high vehicle speed is not permitted in the target gear to be shifted. [0004] Such a pneumatic shifting device with mechanical protection against incorrect...

AI Technical Summary

Problems solved by technology

[0009] Although the known electro-pneumatic shifting unit has some advantages, its structure is rather complex

In addition, this shifting unit has the technical problem that the locking force for holding the shifting and selection shaft in the channel for the third and fourth gears must be considerable, so that due to the increased actuation imposed by this The force reliably signals the driver when the selector lever is actuated, so that the split-group shifting begins, when incorrect gear changes are to be avoided

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