Device for latching and locking shift rockers of a shift device of a transmission, and use of a device of said type

A device for latching and locking of shift rockers (1, 1′) of a shift device of a transmission. The device has a lock part (3, 3′), for each shift rocker (1, 1′), which resides in a receptacle (2) of the shift rocker (1, 1′), which interacts with a lock contour (5, 5′), positioned in a non-moving area of the transmission, for the latching purpose, whereby the lock part (3, 3′) also serves, in addition to the latching, as an interlock for the shift rocker (1, 1′).

This application is a National Stage completion of PCT/EP2008/062026 filed Sep. 11, 2008, which claims priority from German patent application serial no. 10 2007 044 519.0 filed Sep. 18, 2007.

FIELD OF THE INVENTION

The present invention relates to a device for latching and locking of shift rockers of a shifting device of a transmission.

BACKGROUND OF THE INVENTION

Shifting devices are known for transmissions for motor vehicles in the automotive technology. They usually comprise of a central shifting shaft, at which several shift rockers are positioned which, when shifting gears, engage with associated sliding sleeves.

In transmissions where the gear is engaged through shifting parts, a locking of the shifting parts, which is not participating in the shifting operation, has to be ensured whereby the locking usually takes place through separate parts, for instance pins. As an example, in traditional manual shift transmissions more than two shifting parts need to be locked; in a double clutch transmission, however, one shifting part for each partial transmission needs to be locked. The latching usually takes place by means of a latching bolt which is supported in the enclosure or otherwise, whereby the latching contour is positioned at the shifting part.

In addition, latching devices are known in the art which are positioned directly on the synchronizer body. Hereby, springs are inserted into at least two boreholes, positioned on the circumference of the synchronizer body, which are in an operating connection with balls and an associated contour in the gear shift sleeve.

Passive interlocking devices are common where the shifting parts lock themselves, and active interlocking devices, in which the required shifting part, which is needed for the shifting procedure, is released through shifting parts. Known in the art are devices, mainly relate to a shifting part, which releases the associated shifting parts through special contours.

Known to the applicant, by DE-A-199 51 683, is a locking device for a motor vehicle manual shift transmission which is designed in such way that the device already locks the non-required shifting parts when selecting a shift path, meaning before the required gear gets engaged in the chosen shift path. This manual transmission has a central shift shaft with fork shaped shifting parts, in the form of shift rockers or selector forks, which engage in a shift sleeve as well as a locking device which has a lever, whose pivoting point is positioned on a rotation axis of the axial, sliding mounted, central shifting shaft, and which is linked with it through a radial drive configuration. In addition, a lock part is provided which is fixedly mounted to the enclosure, in the direction of shifting, and which has a drive mechanism which converts rotation of the lever into linear movement of the locking device, transverse to the shifting direction of the central shifting shaft. Also, lock parts on the shifting parts and on the lock part are provided in such a way that a shifting movement of the shifting parts, in the direction of shifting, is prevented if these lock parts are covered. The lock part is a particular locking plate which is slidingly positioned on several guide bolts and transverse to the shifting shaft, and it has numerous cut-outs which interact with the lock parts positioned on the shifting parts.

A manual shift transmission is known to the applicant by the DE 41 18 931 A1, comprising several synchronizing units which are activated through shift rockers or through gear forks, which are positioned on shifting rods. Hereby, lock parts, comprising lock rockers to lock several shift rockers among each other, are provided as well as lock balls or a lock plate to lock several shifting rods among each other.

SUMMARY OF THE INVENTION

The task of this invention is to present a device for latching and locking of shift rockers of a shifting device of a transmission without the need for a separate part for such locking.

Thus, a device is proposed for latching and locking of the shift rockers of a shifting device of a transmission which has a lock part, positioned in a receptacle of the shift rocker for each shift rocker, which interacts with a lock contour, positioned in a non-moving area of the transmission, whereby the lock part, in addition to latching, also serves for the locking of the shift rocker.

In accordance with the invention, the lock part can comprise of a combined part with a self contained enclosure (combined bolt) or of a sleeve, a spring and a bolt, or a ball.

In a favorable way, the lock part also serves for locking of the shift rockers, not needed for shifting, whereby a pivoting interlock plate is provided for this purpose, in the non-moving area of the transmission, which has slots to accommodate the two shift rockers, adjacent the respective enclosure or the sleeve of the lock parts.

Hereby, due to the movement of the shift rocker, when engaging a gear and thus by movement of the lock part, the interlock plate is rotated by the enclosure or sleeve of the lock bolt, respectively, in such a way that the respective enclosure or sleeve of the lock part, of the adjacent shift rocker remains inserted in the associated slot, free of play, as long as the lock part of the activated shift rocker is not moved back into the neutral position.

In this invention, the concept of the integration of the lock part into a shift rocker and its additional use to lock the shift rocker when it is not needed, and the need of a separate part for the mutual locking of two shift rockers, in the shifting direction, can be omitted.

The inventive device for the latching and the locking of shift rockers is particularly suitable for double clutch transmissions in which two shift rockers are provided in each partial transmission. It is also possible to use the inventive device in a conventional manual shift transmission.

DETAILED DESCRIPTION OF THE PREFERED EMBODIMENTS

InFIG. 1, two shift rockers1,1′ are shown which each have a lock part3,3′ in an associated receptacle2. A lock contour5,5′, corresponding with each of the lock part3,3′, is positioned in a fixed area of the transmission, for instance in the enclosure4. As diagrammatically shown inFIG. 2, the lock parts3,3′ can also be designed as combined parts or comprise of a sleeve, a lock spring and a bolt or a ball.

As shown inFIGS. 1 and 2, a provided interlock plate6is assigned to the shift rockers1,1′, whose pivotal point is positioned between the two lock contours5,5′ of the adjacent shift rockers1,1′ whereby the interlock plate6has a slot7,7′, at each end, for accommodating the enclosure or the bushing of the lock parts3,3′, respectively.

When the shift rockers1,1′ are in a neutral position, a neutral locking takes place through the operational connection between the lock parts3,3′ and the related lock contours5,5′. Hereby, the lock parts3,3′, through the force of a lock spring, are pressed into the related lock contours5,5′ so that, without any application of force, no gear can be selected. Hereby, the interlock plate6is positioned and dimensioned in such a way that the enclosure or bushings, respectively, of the lock parts3,3′ are partially positioned in a related slot7,7′ of the interlock plate6; in addition, the interlock plate6is maintained in this position via a spring part, not shown here.

If the shift rocker1is actuated at that time, the lock part3, connected with the shift rocker, is forced out of the lock contour and performs an axial movement, due to the movement of the shift rocker and due to the geometry of the lock contour, against the force of the lock spring.

The interlock plate6of this invention is formed in such a way that the axial movement of the lock part3results in a rotation movement of the interlock plate6, against the force of the spring element of the interlock plate6, so that the slot7′ of the interlock plate6moves towards the lock part3′ of the non-actuated shift rocker1′ and fully accommodates it, whereby the enclosure or the bushing, respectively, of the lock part3′ of the adjacent shift rocker1′ remains inserted in the related slot7′, free of play, as long as the lock part3is not moved back into the neutral position, whereby the shift rocker1′ becomes interlocked.

Naturally, every constructive embodiment, especially the spatial positioning of the parts of the inventive device, for locking and interlocking of the shift rockers of a shifting device in a transmission, are considered, by each other and if technically logical, as a part of the presented claims, without affecting the function of the device as it is presented in the claims, even if the embodiments are not explicitly presented in the drawings or in the description.