WO2009112345A1

WO2009112345A1 - Arrangement for actuating at least one shifting device of a gear mechanism

Info

Publication number: WO2009112345A1
Application number: PCT/EP2009/052015
Authority: WO
Inventors: Matthias Reisch; Mark Mohr; Ralf Dreibholz
Original assignee: Zf Friedrichshafen Ag
Priority date: 2008-03-13
Filing date: 2009-02-20
Publication date: 2009-09-17
Also published as: DE102008000635A1

Abstract

The invention relate to an arrangement for actuating at least one shifting device of a gear mechanism, comprising an actuation device (1) that is arranged at least partially inside a shaft that is associated with at least one gear toothed wheel that is to be shifted. According to the invention, at least one energy accumulator for the temporary storage of actuation energy is associated with said actuation device (1).

Description

Arrangement for actuating at least one Schalteinrichtunq a transmission

The present invention relates to an arrangement for actuating at least one switching device of a transmission with an actuating device according to the closer defined in the preamble of claim 1. Art.

From the vehicle technology it is known that switching devices or switching elements e.g. be operated in the countershaft gears by means of shift forks or shift rockers from radially outside. For example, from the publications DE 43 25 964 and DE 103 02 502 A1 transmissions are known in which the switching devices or switching elements each comprise an axially displaceable sliding sleeve to switch the respective gearwheel. The sliding sleeve is hydraulically controlled. For this purpose, corresponding Kühlölzuführungskanäle are arranged in the shaft at which the to be switched gear wheels are.

From the document DE 102 06 584 A1, a manual transmission is known, are provided in the to be switched gear wheels with an internal operation and thereto adapted actuators. The internal operation of the sliding sleeve is realized via a connecting pin which can move axially in slots of the hollow shaft. The connecting pin is actuated by a co-rotating hydraulic unit integrated in the hollow shaft. The oil supply unit is disposed outside the hollow shaft.

In addition, from a not yet published application of the applicant DE 10 2006 049 274 a device for actuating a gear designed as a loose gear of a transmission device in countershaft design known. The transmission device comprises two switching devices, which can each switch two idler gears of a countershaft. The switching devices are actuated via two actuating devices from the interior of the countershaft designed as a hollow shaft. An internal actuation of the switching devices or the switching elements requires a smaller radial space for the transmission, due to the radially inwardly arranged actuators. However, the space within the shaft is limited, so that the dimensioning of the actuator must be adapted to these predetermined space conditions.

The present invention is based on the object to provide an arrangement for actuating at least one switching device of a transmission of the type described above, which applies the required actuation energy with the lowest possible power consumption.

This object is achieved by the features of claim 1. Further advantageous embodiments will become apparent from the dependent claims and the drawings.

In the arrangement proposed according to the invention for actuating at least one switching device of a transmission with an actuating device, which is arranged at least partially inside a shaft, which is associated with at least one gear to be switched, it can be provided that the actuating device at least one energy storage or the like for temporarily storing Activation energy is assigned.

In this way, regardless of the respective type of actuation and type of switching sufficient operating energy can be temporarily stored in the energy storage before the switching element is to be actuated. As a result, higher actuation energies can also be set up in advance without major dimensioning of the actuator, so that the actuation device can release the required actuation energy sufficiently quickly at the desired switching time with the aid of the energy accumulator. So- With a particularly compact and lightweight design of the actuator is possible.

As part of a preferred embodiment, it can be provided that the actuating device comprises at least one electromechanical actuator, which is coupled via at least one spring element or the like to the switching device. By using one or more spring elements, the energy applied by the electromechanical actuator can be stored. Since the clamping of the spring element can be started before the switching time, thus more time is available for applying the actuation energy in the arrangement according to the invention. Consequently, the actuator can be made smaller. In addition, therefore, the power and the transmission electronics of the actuator can be dimensioned correspondingly smaller. In addition, the vehicle electrical system load in the vehicle advantageously drops as a result.

In order to enable a storage of the actuation energy, it can be provided that the switching device or the switching element is associated with at least one detent or the like for holding the switching device in a neutral position and / or in a switching position. Thus, the required actuation energy can be applied in the simplest way even before the switching time by the actuator without a circuit. In addition, it is also possible that when the switching device is in the shift position, the required for transferring to the neutral position actuating energy is stored, since the switching device is locked in the shift position.

In order to realize a storage of the actuating energy for moving the switching device between the neutral position and the switching position, it can be provided that the spring element z. B. is designed as a compression spring and a tension spring. In this way, the actuation energy in both Directions are saved. It is also possible that two separate spring elements are used. You may also be able to use other types of energy storage.

According to a further development of the invention, the lock may comprise at least one housing-side locking element or the like, which can be brought to hold the neutral position and / or the switching position with at least one switch device side recess or the like in operative connection. The locking element can also be designed as a latching element or the like. Depending on the embodiment, for example, a locking element can be assigned to two recesses on the switching element or on the switching device, which correspond to the neutral position and the switching position of the switching element.

It is according to a next development also possible that only one recess is provided on the switching device, which can be assigned to a first and a second locking element by corresponding movement of the switching device, wherein a locking element of the switching position and the other locking element associated with the neutral position. There are also other structural embodiments of the lock possible. For example, each locking element on the switching device and the recesses can be arranged on the housing side.

The actuation of the locking element can be carried out, for example, as a function of the position of the actuator of the actuating device and / or the force or the torque of the actuator. It is also conceivable that a separate or additional actuator is provided for actuating each locking element.

According to a further embodiment of the invention can be provided that, for example, designed as a switching claw switching device in its switching position or even in its neutral position by a claw undercut or the like is held. There are also other positive and / or frictional switching devices can be used as a single or double switching element.

When using an electromechanical actuator may preferably be provided in the form of an electric motor with a spindle drive a linear actuator. Preferably, a position- and / or force-controlled or -controlled electric motor can be used. The spindle drive can be designed with or without self-locking. There are also other means of transmission conceivable. Possibly also hydraulically or pneumatically actuated actuators can be used in the actuator assembly according to the invention. Furthermore, the actuator can be fixed to the housing or can also be arranged to rotate with the shaft.

Preferably, a so-called modular construction of the arrangement proposed according to the invention for actuating the switching devices can be used. This means that, for example, a plurality of electrical actuators are arranged in a common module. In addition to the actuators and the associated power and / or control electronics can also be accommodated in the module. If the actuator is connected via a rotary transformer, such as a slip ring, an inductive transformer or the like, is connected to the associated control unit, and this rotary transformer can be accommodated in the module.

The invention will be explained in more detail with reference to the drawings. Show it:

Fig. 1 is a schematic view of a first embodiment of an inventive arrangement; and Fig. 2 is a schematic view of a second embodiment of the arrangement.

FIGS. 1 and 2 schematically show two different embodiments of an arrangement for actuating a switching device of a transmission, wherein the individual components are indicated only schematically. The arrangement according to the invention can, irrespective of the respective variant, be applied to any desired gearboxes, e.g. Double clutch transmissions, automated manual transmissions, planetary gears or the like, can be used. The type of switching device and the actuators can be chosen arbitrarily, the exemplary embodiments are described using an electromechanical actuator.

Regardless of the particular embodiment variant, the actuating device 1 provided as a linear positioning unit is preferably at least partly in a shaft, e.g. a countershaft of a dual clutch transmission arranged. The actuating device 1 is connected via a e.g. housing-side mounted control unit 1 1 driven to operate, for example, a switching device 2, such as a shift claw. With the switching device 2, at least one of the shaft associated gear tooth can be switched.

The actuator 1 comprises in the illustrated embodiments as an electromechanical actuator, an electric motor 3 with a spindle drive 4. The spindle drive 4 is coupled according to the invention via at least one energy store with the switching device 2. In this way, the applied by the electric motor 3 actuation energy in the example formed as a spring element 5 energy storage can be cached before the switching device 2 is actuated. This results in a compact, lightweight construction, since the electromechanical actuator is not suitable for the actuation of must be designed, but with the help of one or more spring elements mechanical energy can release very quickly. Consequently, the actuator can be made smaller, as this has more time available for tensioning the spring element, as would be acceptable for direct operation of the switching device.

In the embodiment variant shown in FIG. 1, the switching device 2 is assigned a detent for holding the switching device 2 in a neutral position 6 and in a switching position 7. The lock comprises a housing-side locking element 8, which can be brought into positive engagement or latched to hold the neutral position 6 or the switching position 7 with a corresponding recess 9, 10. The recesses 9, 10 are provided on the switching device 2. In Figure 1, the locking element 8 is in positive engagement with the recess 9, which corresponds to the neutral position 6 of the switching device 2. Thus, the actuating energy, which is applied by the electric motor 3, are stored by the spring element 5 by the spring element 5 is tensioned. Since the switching device 2 is initially held in the neutral position by the locking element 8, the actuating energy can be applied to the spring element 5. Only when the switching command occurs, the actuation energy can be released very quickly by the spring element 5 by releasing the lock. In this case, the spring element 5 acts as a compression spring.

In the opposite case, when the switching device 2 is locked in the switching position 7, in which the locking element 8 is positively received in the recess 10 of the switching device 2, the spring element 5 is designed as a tension spring. As a result, complete storage of the required actuation energy can also take place in this case, so that the actuation energy is also released very quickly by the spring element 5 in order to move the switching device 2 from the switching position 7 into the neutral position 6. In the second embodiment shown in Figure 2 second variant is provided in contrast to the first embodiment that two locking elements 8, 8 'are arranged on the housing side, which are engageable with only one recess 9 for locking the switching device 2 in positive engagement. The first locking element 8 is assigned in the second embodiment of the neutral position 6 of the switching device 2. The second locking element 8 'is associated with the switching position 7. The operation is otherwise substantially identical to the first embodiment and will therefore not be further described here.

The actuation of the locking elements 8, 8 'can be carried out independently of the respective embodiment depending on the position of the actuator or in dependence of the force or the torques of the actuator, wherein the actuating direction 1 of the respective locking element 8, 8' by a double arrow in the figures 1 and 2 is indicated. For example, each locking element 8, 8 'may be spring loaded, so that it can engage in the respective recess 9, 10. The actuation dependent on the actuator can for example take place in that upon reaching a certain position, a certain force or a certain torque, for example by positive engagement or the like, a corresponding actuation of the respective locking element 8, 8 'takes place. It is also possible that a separate actuator for example, each locking element 8, 8 'is provided to operate it when needed. REFERENCE CHARACTERS

actuator

switching device

electric motor

spindle drive

spring element

neutral position

Switch position, 8 'locking element

Recess 0 recess 1 control unit

Claims

Patent Attorney

1. Arrangement for actuating at least one switching device (2) of a transmission with an actuating device (1), which is arranged at least partially in the interior of a shaft which is associated with at least one gear to be switched gear, characterized Porsche Style n zei ch et that the actuating device (1) at least one energy store is allocated for temporary storage of actuation energy.

2. Actuator assembly according to claim 1, characterized in that the actuating device (1) comprises at least one electromechanical actuator which is coupled via at least one spring element (5) with the switching device (2).

3. Actuator assembly according to claim 1 or 2, characterized in that the switching device (2) at least one detent for holding the switching device (2) in a neutral position (6) and / or in a switching position (7) is assigned.

4. Actuator assembly according to claim 3, characterized g e ke n ze ze c h n e t, that the spring element (5) is designed as a compression spring and / or as a tension spring.

5. Actuator arrangement according to claim 3 or 4, characterized in that the lock comprises at least one housing-side locking element (8, 8 '), which for holding the neutral position (6) and / or the switching position (7) with at least one switching device side recess (9 , 10) can be brought into operative connection.

6. Actuator assembly according to claim 5, characterized g eke n n zei ch n e t that the actuation of the respective locking element (8, 8 ') in dependence on the position of the actuator and / or the force or the torque of the actuator is feasible.

7. Actuating arrangement according to claim 5 or 6, characterized in that at least one separate actuator is provided for the actuation of the respective locking element (8, 8 ').

8. Actuating arrangement according to one of the preceding claims, characterized in that the switching device (2) designed as a switching claw is held in its neutral position (6) and / or in its switching position (7) by a claw rear intersection.

9. Actuating arrangement according to one of the preceding claims, characterized ge ke n ze ze c h et et, that the actuator as a linear adjusting unit comprises an electric motor (3) with a spindle drive (4).

10. Actuating arrangement according to claim 9, characterized in that it is not shown that the electric motor (3) is coupled to a control device (11) via a rotary transformer.

11. Actuating arrangement according to claim 9 or 10, characterized in that e e n e c e s e s that the electric motor (3) is position- and / or force-controlled or controlled.

12. Actuating arrangement according to one of the preceding claims, characterized in that at least each actuator of the actuating device (1) is arranged in a module in the interior of the shaft.