Shift securing device for a multi-speed manual gearbox

Abstract

The invention relates to a shift securing device for a multi-speed manual gearbox which can be shifted by means of a gearshift shaft (14), which is disposed axially parallel to the transmission shafts (2, 3, 5) and is mounted so as to be axially movable and rotatable about the longitudinal axis (15) thereof and which can be selectively coupled by means of a respective associated shift finger (16, 17, 18, 19) to at least one shift fork (7, 9) guided on gearshift rod (6, 8) and / or to a shift crank (11, 13). Said shift securing device comprises a locking body (26), which is axially latched rigidly to the housing and can be rotated with the gearshift shaft (14) and on which locking elements (42, 43, 44, 45) are disposed for positive latching of the non-coupled shift forks (7, 9) and / or shift cranks (11, 13). In the shift securing device according to the invention, the locking body (26) is designed as a box frame (27) having at least two transverse supports (28, 29) and two longitudinal supports (30, 31), said frame comprising a bearing bore (32, 33) disposed in each of the transverse supports (28, 29), the gearshift shaft (14) being received in an axially movable manner in said bearing bores. Said box frame is connected non-rotatably to the gearshift shaft (14) by means of a driver (18) positively engaging peripherally with one of the longitudinal supports (30) and said box frame is axially latched rigidly to the housing by means of an axial bearing (36) disposed on one of the transverse supports (28).

Description

technical field [0001] The invention relates to a shift lock arrangement for a multi-speed transmission according to the features of the preamble of claim 1 . Background technique [0002] Multi-speed transmissions of motor vehicles are generally designed as countershafts and have at least two axially parallel drive shafts, which can be selectively brought into transmission with one another via a plurality of gears with different transmission ratios. In the case of a transmission provided for longitudinal installation in a motor vehicle, the drive shaft generally refers to the layshaft and the output shaft which are in driving connection with the input shaft via an input constant. In the case of a transmission provided for transverse installation in a motor vehicle, the drive shaft is usually formed by an input shaft and an output shaft. The gears are usually designed as spur gear pairs, which each have a fixed gear wheel that is fixedly arranged on one drive shaft and an i...

AI Technical Summary

Problems solved by technology

[0009] All of the above-mentioned shift locks have a functional-technical disadvantage: the unconnected shift elements (shift forks and / or shift rockers) can only be moved or turned out of their neutral position by the connected shift elements. position is positively fixed

However, this type of construction of a transmission with shift forks guided axially displaceably on a selector shaft is relatively rare and is not suitable for more than three shift elements or selector forks in order to achieve compact dimensions. Gearbox for shaft shifter grooves

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