DE10239916A1 - Device to limit gear change movement of gear change unit of motor vehicles has locking device fastened to selector shaft and coupled to gear change unit element - Google Patents

Abstract

The device incorporates a selector shaft in a housing. A locking device (1) is fastened to the selector shaft and coupled directly or indirectly to an element of the gear change unit, so that the change movement (5) is limited in axial direction of the selector shaft. An undercut aperture (4) in the housing (3) corresponding with the locking device forms an element of the change unit, and the length of the aperture defines the possible change travel of the selector shaft. The locking device is a change finger (6) with a free end (7) projecting into the aperture.

Description

The present invention relates to a device for limiting the switching path of a switching device according to the generic term of claim 1.

Switching devices are from automotive engineering for a Gearbox of a vehicle known. Each switching device has one central shift shaft on which several shift rockers are arranged, which engage in corresponding sliding sleeves for shifting a gear.

From the publication DE 199 51 683 A1 a single-rod switching device for a motor vehicle manual transmission is known. The central switching shaft of the single-rod switching device has fork-shaped switching devices which engage in sliding sleeves. Furthermore, the switching device comprises a locking device for limiting the switching path.

With this locking device it is envisaged that over a radial entrainment of the dial rotation the axially displaceable shift shaft is transferred to a lever whose fulcrum lies on the axis of rotation of the selector shaft, whereby the rotary movement of the lever into a linear movement of a locking part transversely to the switching device of the Central shift shaft is implemented. The locking part is in the switching direction fixed to the housing arranged, the relative movement of the central control shaft relative to the locking part when shifting a gear by the corresponding one Degree of freedom in the entrainment itself or within the coupling drive he follows. The locking part and the rocker arms or push forks have locking elements which are arranged such that in the overlap the locking elements in the switching direction a movement of the shift rocker or push forks for shifting the transmission is prevented.

In the known switching devices with corresponding locking devices, there is the disadvantage that a variety of components are required to limit the shift travel are. Furthermore, the individual locations of the boundary are relatively greater Distance from each other so that tolerances or thermal and dynamic loads negatively affect the switching path limitation.

The invention has for its object a Device for limiting the switching path of the aforementioned Propose genus in which the disadvantages of the prior art be avoided.

This object is achieved by the Features of claim 1 solved. Advantages and further configurations result from the subclaims.

Accordingly, a device according to the invention to limit the switching path of a switching device of a transmission proposed in which at least one locking member is provided which is firmly connected to the shift shaft and with an element the switching device is directly or indirectly coupled in such a way that the switching path is limited in the axial direction of the switching shaft is.

In this way, the proposed Device a switching path limitation can be realized, which thereby is achieved that an element of the switching device, such as e.g. the housing or another suitable element of the switching device directly or indirectly via the locking member is coupled to the selector shaft.

Thus, a predetermined shift path the control shaft in the axial direction suitably limited. To this The location of the limitation can be, for example, in the housing Part of the switching device can be freely selected and there can be negative influences Avoid due to thermal loads and tolerances. at the device according to the invention can thus possible Tolerances in the switching paths can be reduced to a minimum.

As part of an advantageous embodiment The present invention can provide that as an element the switching device one corresponding to the locking member Recess on the housing is provided. The length the recess gives the possible in this embodiment Switching path of the selector shaft in the axial direction. For example can be an undercut or the like on the housing or as a recess also provided on any other element of the switching device his.

Is preferred as a locking member a shift finger is provided which has a free end and with this protrudes into the recess. It is also possible that as an indirect coupling of the housing an additional component is provided with the locking member is, which is then connected to the locking member to a To allow limitation of the switching path of the switching shaft.

In the device according to the invention can advantageously to reduce noise in the locking member and the element of the switching device uses a suitable material be, which enables noise reduction. Can also the locking member and the element of the switching device accordingly be designed constructively so that noise in particular when actuating the device is reduced.

The invention is based on the following Figure explained in more detail by way of example.

One possible figure is preferred in the single figure embodiment the device according to the invention schematically shown to limit the switching path.

The bottom holding device comprises a switching shaft 2 which on a housing 3 is arranged. According to the invention, the device has at least one locking member 1 on which with the shift shaft 2 is firmly connected. Furthermore, the locking member 1 be directly or indirectly coupled to an element of the switching device such that the switching path, which in the figure by arrows 5 is indicated in the axial direction of the control shaft 2 is limited.

In the embodiment of the invention shown here, the locking member 1 directly with the housing 3 coupled as an element of the switching device, the housing 3 one with the locking member 1 has corresponding recess, which as an undercut 4 is trained. By the length of the recess or the undercut 4 the possible switching path of the selector shaft is on the housing 2 limited.

This can be achieved in that as a locking member 1 a shift finger 6 is provided which has a free end 7 has that in the undercut 4 protrudes into the housing. It is also possible for several locking elements 1 on the selector shaft 2 are provided.

For indirect coupling of the housing, at least one further component can be provided as an element of the switching device, which then connects to the locking member 1 is coupled to the shift path of the shift shaft 2 to limit.

1

locking member

2

shift shaft

3

casing

4

undercut

5

Contact travel

6

shift finger

7

free The End

Claims (5)

Device for limiting the switching path of a switching device of a transmission of a motor vehicle, comprising a switching shaft which is arranged in a housing, characterized in that at least one locking member ( 1 ) is provided, which with the selector shaft ( 2 ) is firmly connected and is directly or indirectly coupled to an element of the switching device such that the switching path ( 5 ) in the axial direction of the switching point ( 2 ) is limited. Device according to claim 1, characterized in that as an element of the switching device, one with the locking member ( 1 ) corresponding recess on the housing ( 3 ) is provided, the length of the recess indicating the possible switching path ( 5 ) the selector shaft ( 2 ) specifies. Apparatus according to claim 2, characterized in that an undercut ( 4 ) on the housing ( 3 ) is provided. Device according to one of the preceding claims, characterized in that as a locking member ( 1 ) a shift finger ( 6 ) is provided, which has a free end ( 7 ) that protrudes into the recess. Device according to one of the preceding claims, characterized in that on the housing ( 3 ) at least one component is provided which is connected to the locking member ( 1 ) is coupled.