A vehicle transmission includes a shaft; speed-changing gears; switching mechanisms; and a shifting mechanism. The shifting mechanism is provided with a double-meshing preventing mechanism configured to switch between a one-way state in which the switching mechanisms are hindered from moving in a downshift direction and allowed to move in an upshift direction and a free state in which the switching mechanisms are allowed to move in both the downshift direction and the upshift direction.

The invention relates to a linear actuator (1) for an automobile transmission comprising an electric motor (6) for moving a transmission control member (5) between a plurality of shift positions, a spring (15) for driving the transmission control member (5) to an end position of the shift range in case of electric power failure, and a worm screw (7) to drive a displaceable worm wheel (10) with a pinion (11) meshing with a displaceable gear rack (12). The transmission control member (5) is displaceably coupled to the worm wheel (10). The gear rack (2) is blocked by an electrically activated lock against linear displacement with the spring (15) in a compressed state such that upon interruption of power supply to the lock the gear rack (12) is released and linearly displaced by the spring (15) thereby shifting the transmission control element (5) to its end position.

A vehicle transmission includes a shaft; speed-changing gears; switching mechanisms; and a shifting mechanism. The shifting mechanism is provided with a double-meshing preventing mechanism configured to switch between a one-way state in which the switching mechanisms are hindered from moving in a downshift direction and allowed to move in an upshift direction and a free state in which the switching mechanisms are allowed to move in both the downshift direction and the upshift direction.

Described herein is a system for operating a gearbox that includes: a first shaft having a first longitudinal axis; a first actuator assembly operatively connected to the first shaft; a second shaft having a second longitudinal axis; a second actuator assembly operatively connected to the second shaft; and a plurality of engagement elements connected in rotation to the second shaft. The first shaft is hollow, is fitted on the second shaft, and is axially movable relative to the second shaft. The plurality of engagement elements are moreover connected in translation to the first shaft and are axially movable therewith along the first longitudinal axis and relative to the second shaft. The first and second shafts can be operated independently of one another for execution of the movements of selection and engagement of the gears of the gearbox.

A parking lock for motor vehicle, including a parking lock wheel that can be connected to a shaft of the motor vehicle in a rotationally fixed manner, at least one blocking element, and an actuator, by which the blocking element is movable between at least one blocking position securing the parking lock wheel against rotation, and at least one release position releasing the parking lock wheel for a rotation, comprising at least one spring element, which by the actuator is to be tensioned during the moving of the blocking element into the blocking position, thus providing a spring force in the blocking position of the blocking element, by which the actuator is to be supported during the movement of the blocking element into the release position.

A shift drive including an actuating mechanism, a rack, and a gear housing. The actuating mechanism is driven by a driving mechanism. The rack is linked with the actuating mechanism. The rack includes a connection portion connected to the actuating mechanism through a connecting member 301 The gear housing is provided with an induction gear that meshes with the rack. The gear housing includes a track slot includes a take-up release section and a straight rail section, and an end portion of the rack is capable of a recoverable deformation that can slide in or out of the take-up release section and the length of projection of the take-up release section on an extension line in the direction of the length of the straight rail section is less than the length of the track thereof.

A vehicle transmission includes a shaft; speed-changing gears; switching mechanisms; and a shifting mechanism. The shifting mechanism is provided with a double-meshing preventing mechanism configured to switch between a one-way state in which the switching mechanisms are hindered from moving in a downshift direction and allowed to move in an upshift direction and a free state in which the switching mechanisms are allowed to move in both the downshift direction and the upshift direction.

The invention relates to a linear actuator (1) for an automobile transmission comprising an electric motor (6) for moving a transmission control member (5) between a plurality of shift positions, a spring (15) for driving the transmission control member (5) to an end position of the shift range in case of electric power failure, and a worm screw (7) to drive a displaceable worm wheel (10) with a pinion (11) meshing with a displaceable gear rack (12). The transmission control member (5) is displaceably coupled to the worm wheel (10). The gear rack (2) is blocked by an electrically activated lock against linear displacement with the spring (15) in a compressed state such that upon interruption of power supply to the lock the gear rack (12) is released and linearly displaced by the spring (15) thereby shifting the transmission control element (5) to its end position.

A gearbox actuator unit (14) is configured to be arranged on a gearbox (10) and includes a housing (22), a control device (24), and an actuator (28, 30). The housing (22) is configured to attach to a gearbox housing (12) and to seal the gearbox housing (12). The control device (24) is electrically connected to the actuator (28, 30) and activates the actuator (28, 30). A pinon of the actuator (28, 30) is configured to actuate a rack of a shift fork (18, 20) of the gearbox (10) and can be connected to the shift fork (18, 20) of the gearbox (10). The control device (24) and the actuator (28, 30) are arranged within the housing (22), with the pinion extending through an opening of the housing. A gearbox (10) with a housing (12) having an opening (44) receives the actuator unit (14), which closes and seals the opening (44).

A gearbox actuator unit (12) is formed so as to be to be arranged on a gearbox (10). The unit (12) has a flange (14), an actuator (16, 18), a rack (20, 22) and a guide (24, 26). The flange (14) is formed to be connectable to a housing of the gearbox. The rack (20, 22) is received in an axially moveable manner within the guide (24, 26). The actuator (16, 18) meshes with the rack (20, 22) via a pinion (44, 46) and is formed so as to move the rack (20, 22) axially.