WO2010031555A1

WO2010031555A1 - Transmission unit

Info

Publication number: WO2010031555A1
Application number: PCT/EP2009/006720
Authority: WO
Inventors: Jens Bode; Hans-Jürgen Neubauer
Original assignee: Daimler Ag
Priority date: 2008-09-18
Filing date: 2009-09-17
Publication date: 2010-03-25
Also published as: DE102008050774A1; DE102008050773A1

Abstract

The invention is based on a transmission unit, in particular dual-clutch transmission unit, having at least one transmission housing part (10) which at least partially surrounds a transmission interior space (11), and having at least one first actuator (12) which is provided for actuating at least one first transmission shift element (13, 14) and which has an actuator base unit (15) which is formed separately from the transmission housing part (10). It is proposed that the actuator base unit (15) is arranged at least partially in the transmission interior space (11).

Description

gear unit

The invention relates to a transmission unit according to the preamble of claim 1.

There are already gear units, in particular dual-clutch transmission units, with at least one gear housing part which at least partially encloses a transmission interior, and at least a first Betätigungsaktuator which is provided for actuation of at least a first gear shift element and having a Aktua- torgrundeinheit separated from the Gear housing part is formed, known.

The invention is in particular the object of providing a compact transmission unit as possible. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.

The invention relates to a transmission unit, in particular Doppelkupplungsgetrie- unit, with at least one gear housing part, which encloses at least partially a transmission interior, and at least a first Betätigungsaktuator which is provided for actuation of at least a first transmission shift element and having a Aktuatorgrundeinheit, the is formed separately from the gear housing part.

It is proposed that the actuator base unit is arranged at least partially in the transmission interior. As a result, an additional space for the actuator base unit can be saved, since the transmission interior can be advantageously used for the arrangement of the actuator base unit. The term "basic actuator unit" should be understood to mean, in particular, a basic unit of the actuating actuator which is intended to provide an actuating force for the actuating actuator The actuator basic unit is to be understood as meaning a unit comprising an actuator cylinder and an actuator piston of a hydraulic actuating actuator but also other basic actuator units conceivable, such as For example, an actuator base unit with an electromagnet and an interacting with the electromagnet setting means of an electromagnetic Betätigungs- saktuators or an actuator base unit with a cylinder and a piston of a pneumatic Betätigungsaktuators. The term "provided" is to be understood as meaning in particular specially equipped and / or designed, in particular a space which is enclosed in the assembled state by a transmission housing.

In particular, it is advantageous if the actuator base unit is arranged completely in the transmission interior. Thereby, the transmission interior can be used particularly advantageous and the transmission unit can be equipped particularly advantageous. In addition, it can be achieved that can be dispensed with a passage of moving parts through the gear housing, such as a passage of shift rails, whereby a particularly simple embodiment of the transmission housing can be achieved.

It is further proposed that the actuator base unit has an actuator cylinder which is provided to enclose at least two separate working volumes. As a result, a double-acting actuating actuator can be provided, whereby advantageously two switching directions can be switched by means of the actuating actuator.

In a particularly advantageous embodiment, it is proposed that the actuator base unit has an actuator piston, which is intended to be arranged axially between the working volume. Thereby, a particularly compact Betätigungsaktuator be provided.

Advantageously, the actuator piston has at least two Aktuatorkolbenelemente, which are each provided for one of the working volume. As a result, a particularly simple assembly of the actuator base unit can be made possible. In particular, an embodiment of the Betätigungsaktuators can be achieved, which can be mounted independently of the transmission unit, whereby the Betätigungsaktuator can be configured as an Betätigungsaktuator that can be checked independently of the transmission unit.

In a further embodiment of the invention, it is proposed that the actuating actuator has a fastening unit which is provided to at least one Part of the Betätigungsaktuators firmly connected to the transmission housing part. As a result, an advantageous fixation of the Betätigungsaktuators can be achieved.

In addition, a positive positioning of the actuating actuator between gear housing parts is possible. In this case, then only an anti-rotation of the actuator base unit is required.

In particular, it is proposed that the fastening unit is at least partially formed integrally with the Aktuatorgrundeinheit. As a result, a particularly simple fastening unit can be realized.

It is particularly advantageous if the fastening unit is formed at least partially in one piece with an actuator cylinder of the actuator base unit. As a result, the actuator cylinder can be attached particularly easily.

It is further proposed that the fastening unit is provided to connect the actuator base unit on both sides with a transmission housing. As a result, a particularly stable design can be found. The term "two-sided" is to be understood in particular as meaning that the actuator base unit is arranged at least partially between fastening means of the fastening unit.

In a further embodiment of the invention, it is proposed that the gear unit has a second actuating actuator, which is arranged corresponding to the first actuation actuator and which is provided to actuate at least one second gear shift element. This allows a particularly compact design of the two Betätigungsaktuatoren be achieved. By "corresponding" is to be understood in particular that an embodiment of the two Betätigungsaktuatoren is adapted to each other.

Preferably, the second actuation actuator has an actuator base unit disposed coaxially with the actuator base unit of the first actuation actuator. As a result, a particularly advantageous corresponding embodiment of the actuation actuators can be achieved.

In particular, it is advantageous if the first actuating actuator and the second actuating actuator are at least partially made in one piece. This can particularly simple design can be achieved. In particular, this allows the two Betätigungsaktuatoren form a mounting module that can be easily mounted.

Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Showing:

1 shows a detail of a transmission unit with two Betätigungsaktuatoren,

2 is a perspective view of one of the Betätigungsaktuatoren,

3 is a perspective view of basic actuator units of the actuation actuators,

4 shows a side view of a section of the gear unit with the actuating actuators, and FIG. 5 shows a front view of a section of the gear unit.

Figure 1 shows a section of a transmission unit. The transmission unit is designed as a dual-clutch transmission unit. The transmission unit has a transmission housing 24, which encloses a transmission interior 11. Next, the transmission unit transmission shift elements 13, 14, 26, by means of which for the transmission of gears axially displaceable sliding sleeves 28, 29, 30 are operated. For switching the gears gears formed as idler gears by means of the sliding sleeves 28, 29, 30 connected to waves on which the gear wheels are arranged.

The transmission shifting device has actuating actuators 12, 25, by means of which a switching force is provided for actuating the gear shift elements 13, 14, 26. By means of the first Betätigungsaktuators 12, the transmission shift elements 13, 14 are moved. By means of the second Betätigungsaktuators 25, the transmission switching element 26 can be moved. Each actuation actuator 12, 25 has an actuator base unit 15, 27. The basic actuator units 15, 27 each act in two directions. They are independently switchable.

The transmission housing 24 has a transmission housing part 10 which encloses part of the transmission interior 11. The actuator base units 15, 27 of the actuation actuator Ren 12, 25 are carried out separately from the gear housing part 10. They are completely disposed within the transmission housing 24. The gear shift elements 13, 14, 26 are arranged on a common shift rail 16 within the transmission interior. The shift rail 16 is fixedly arranged in the transmission interior 11. The gear shift elements 13, 14, 26 are axially displaceable on the shift rail 16 along a main extension direction 31 of the gear unit. An axial switching direction of the actuating actuators 12, 25 is also directed along the main extension direction 31. A position of the actuator base units 15, 27 is in each case adapted to a position of the gear shift element 13, 14, 26, which is actuated by means of the corresponding actuating actuator 12, 25. The basic actuator units 15, 27 are each arranged directly adjacent to the corresponding gear shift elements 13, 14, 26.

The first Betätigungsaktuator 12 is provided for actuation of the transmission shift elements 13, 14. The actuator base unit 15 of the actuating actuator 12 is designed as a hydraulic actuating unit and has an actuator piston 20 and an actuator cylinder 17. The actuator cylinder 17 is arranged stationary. The actuator piston 20 is fixedly coupled to the transmission shift elements 13, 14. The actuator piston 20 is arranged along the main extension direction 31 at the same height as the gear shift elements 13, 14. A coupling element 32 which connects the actuator piston 20 with the gear shift elements 13, 14, extends substantially perpendicular to the switching direction along which the actuator piston 20 is slidable ,

The actuator piston 20 of the actuator base unit 15 is designed as a double-acting actuator piston. By means of the actuator piston 20, the space spanned by the actuator cylinder 17 is subdivided into two separate working volumes 18, 19. The working volume 18, 19 can be acted upon by means of a control valve unit, not shown, either with an operating medium pressure or switched without pressure. The control valve unit is arranged independently of the actuator base unit 15 outside of the transmission interior 11. In principle, however, it can also be partially or completely integrated into the gearbox housing 24 or be arranged within the gearbox interior 11.

For adjustment in the first switching direction, the first working volume 18 is acted upon by the operating medium pressure, while at the same time the second working volume 19 is depressurized. To adjust in the second switching direction, the second working volume 19 is acted upon by the operating medium pressure, while at the same time the first working Volume 18 is depressurized. Due to the operating medium pressure, the actuator piston 20 is axially displaced in the actuator cylinder 17.

The actuator cylinder 17 is designed in one piece for the two working volumes 18, 19. The working volumes 18, 19 are arranged axially adjacent. They are arranged coaxially with each other along the axial direction. The actuator cylinder 17 is designed tubular. A diameter of the actuator cylinder 17 is the same over an entire extension length of the actuator cylinder 17. To be able to mount the actuator base unit 15, the actuator piston 20 is designed in several parts. The actuator piston 20 has the coupling element 32 and two Aktuatorkolbenelemente 21, 22 for limiting the working volume 18, 19. The Aktuatorkolbenelemente 21, 22 and the coupling element 32 are fixedly connected together in the assembled state.

The first actuator piston element 21 has a first sealing surface 33 which limits the first working volume 18 along the switching direction. The working volume 18 extends essentially starting from the sealing surface 33 in a direction away from the actuator piston 20 direction. An actuation force which can be generated via the first working volume 18 is directed from the sealing surface 33 in the direction of the actuator piston 20.

The second Aktuatorkolbenelement 22 has a second sealing surface 34 which limits the second working volume 19 along the switching direction. The working volume 19 also extends essentially starting from the sealing surface 34 in a direction away from the actuator piston 20 direction. An actuating force that can be generated by the second working volume 19 is opposite to the direction of the actuating force of the first working volume 18. It is also directed in the direction of the actuator piston 20.

It is also possible, in particular in order to enable simple machining and assembly, to choose the diameters of the first and second sealing surfaces 33 and 34 to be of different sizes. The diameter of the sealing surface 33 is always larger than the diameter of the sealing surface 34.

The sealing surfaces 33, 34 of the Aktuatorkolbenelemente 21, 22, which complete the working volume 18, 19, are axially spaced from each other. The actuator piston 20 is in the axial direction between the two working volumes 18, 19 or between the two the sealing surfaces 33, 34 are arranged. The axial extension length of the Aktuatorkolbens is given by an axial distance between the two sealing surfaces 33, 34.

In an area which is provided for an arrangement of the coupling element 32, the actuator cylinder 17 has a recess 35 through which the coupling element 32 is guided in the assembled state. An axial extension length of the recess

35 is smaller than the axial extension length of the actuator piston 20. In a switching movement, the recess 35 in the actuator cylinder 17 is always between the two sealing surfaces 33, 34 of the actuator piston 20th

For fastening the actuator cylinder 17, the actuating actuator 12 has a fastening unit 23, by means of which the actuator cylinder 17 is fixedly connected to the gear housing part 10. A main extension direction of the fastening unit 23 extends substantially parallel to the shift rail 16 on which the transmission shift elements 13, 14, 26 are arranged. The fixing unit 23 and the actuator base unit 15 are partially made in one piece. A part of the fixing unit 23 is formed integrally with the actuator cylinder 17 of the actuator base unit 15.

The actuator cylinder 17 has at one end a fastening means 36, by means of which the actuator cylinder 17 is fixedly connected to the gear housing part 10. The working volume 18 extends in the direction of the fastening means 36. The working volume 18 is limited by the gear housing part 10 on a side opposite the sealing surface 33 of the actuator piston 20. The fastening means 36 has for this purpose a sealing element 37, by means of which the actuator cylinder 17 is tightly connected to the gear housing part 10.

An operating medium supply of the first working volume 18 via the gear housing part 10. The gear housing part 10 has a not shown operating medium recess, which is passed through the gear housing part 10. The working recess is listed as a hole. The Betriebsmittelausnehmung is disposed in a region in which the actuator base unit 15 is connected by means of the fastening means 36 with the gear housing part 10. The fastener

36 has a recess 39 which is configured corresponding to the Betriebsmittelausnehmung in the gear housing part 10. About the recess 39 in the fastening means 36, the Betriebsmittelausnehmung in the gear housing part 10 is connected to the working volume 18. An operating medium supply of the second working volume 19 via an operating line 40, by means of which a distance between the actuator cylinder 17 and the gear housing part 10 is bridged. The operating medium line 40 is connected to a not shown Betriebsmittelausnehmung in the gear housing part 10, which is also designed as a bore. Furthermore, the operating medium line 40 is connected to a recess 41 in the actuator cylinder 17, via which the operating medium line 40 is connected to the second working volume 19. The recess 41 in the actuator cylinder 17 leads directly into the second working volume 19. The working volume 19, which extends in the direction of the recess 41, is limited on a sealing surface 34 of the Aktuatorkolbens 17 opposite side by a parting plane 42. Further, the Betätigungsaktuator 12 a Schaltwegsensormittel 43, which is coupled to the Aktuatorkolben 20 of the actuator base unit 15. The switching path sensor means 43 has two axially spaced-apart magnets 44, 45, the movement or the position of which can be determined by means of a corresponding, stationarily arranged switching path sensor means. The shift travel sensor reading means is not shown in detail. By means of the switching path sensor means 43 connected to the actuator piston 20 and of the corresponding switching path sensor reading means, a switching path sensor is provided, by means of which an axial displacement of the actuator piston 20 and thus a movement of the gear shift elements 13, 14 is determined.

The switching path sensor means 43 is fixedly connected to the coupling element 32, by means of which the actuator piston 20 is connected to the transmission switching element 26. The coupling element 32, which extends substantially perpendicular to the direction of movement of the actuator piston 20, is formed on a side facing away from the gear shift elements 13, 14 for connecting the switching path sensor means 43. The switching path sensor means 43 is positively connected to the coupling element 32. In principle, however, a cohesive or a positive and cohesive connection is conceivable.

The actuator base unit 15 is mounted before it is inserted into the transmission interior 11 and connected to the transmission housing 24. For mounting the actuator base unit 15, first the second actuator piston element 22, which has the sealing surface 34 for the second working volume 19, is introduced from the side of the fastening means 36 into the actuator cylinder 17. After assembly of the actuator piston member 22, the coupling member 32 is passed through the recess 35 in the actuator cylinder 17 and the switching path sensor means 43 is connected to the coupling element 32. Subsequently, the first Aktuatorkolbenelement 21 in the actuator cylinder 17th brought in. After assembly of the first Aktuatorkolbenelements 21, the two Aktuatorkolbenelemente 21, 22 and the coupling element 32 are firmly connected.

Alternatively, a one-piece piston can also be used. For this purpose, however, an alternative connection geometry of the coupling element 32, which connects the Aktuatorkolben with the transmission shift elements, necessary. The connection form must have a U-shaped groove so that the coupling element can be inserted directly into the piston through a window in the actuator cylinder.

The second Betätigungsaktuator 25, by means of which the gear shift element 26 can be actuated independently of the gear shift elements 13, 14, is executed corresponding to the first Betätigungsaktuator 12. For a description of the actuation actuator 25, reference may be made essentially to the description of the actuation actuator 12.

The first Betätigungsaktuator 12 and the second Betätigungsaktuator 25 are arranged coaxially with each other. In addition, the first Betätigungsaktuator 12 and the second Betätigungsaktuator 25 are partially formed in one piece. The actuator basic unit 27 of the second actuating actuator 25 is configured analogously to the actuator basic unit 15 of the first actuating actuator 12. The actuator base unit 27 has an actuator cylinder 38, which is designed in one piece with the actuator cylinder 17 of the first actuating actuator 12. An actuator piston 46 of the second actuating actuator 25 is configured in the same way as the actuator piston 20 of the first actuating actuator 12.

The Aktuatorkolben 46 is also designed in several parts. It has a first actuator piston element 47 with a sealing surface for limiting a first working volume, a coupling element 48 for connecting the gear shift element 26 and a second actuator piston element 49 with a sealing surface for limiting a second working volume 19.

The actuator base unit 27 of the second actuating actuator 25 is partially arranged in mirror image to the actuator base unit 15 of the first actuating actuator 12. The parting plane 42, which limits the second working volume 19 of the first actuating actuator 12, also limits the second working volume of the second actuating actuator 25. A service line 50 and a recess 51 in the actuator cylinder 38, which are provided for an operating medium supply of the second working volume 19, are arranged analogously to the operating medium line 40 and the recess 41 for the second working volume 19 of the first Betätigungsaktuators 12.

In contrast to the first actuation actuator 12, an operating medium supply of the first working volume 18 of the second Betätigungsaktuators 25 via a recess 52 and a resource line 53. The first working volume is limited by a limiting means 54, by means of the actuator cylinder 38 is completed in one direction. The limiting means 54 is fixedly connected to the actuator cylinder 38.

The fastening unit 23 is at least partially made in one piece by the one-piece design of the two actuator cylinders 17, 38 for the two actuating actuators 12, 25. The two actuating actuators 12, 25 are connected by means of the fastening unit 23 on both sides with the transmission housing 24. A second fastening means 55 for fastening the actuating actuators 12, 25 is shown only schematically. The actuating actuators 12, 25 are arranged with respect to the main extension direction 31 between the fastening means 36, 55.

Claims

claims

A transmission unit, in particular a dual-clutch transmission unit, with at least one transmission housing part (10) which at least partially encloses a transmission interior (11) and with at least one first actuation actuator (12) which is provided for actuation of at least one first transmission shift element (13, 14) and having an actuator base unit (15) which is formed separately from the transmission housing part (10), characterized in that the actuator base unit (15) is at least partially disposed in the transmission interior (11).

2. Transmission unit according to claim 1, characterized in that the actuator base unit (15) is arranged completely in the transmission interior (11).

3. Transmission unit according to claim 1 or 2, characterized in that the Aktuatorgrundeinheit (15) has an actuator cylinder (17) which is intended to enclose at least two separate working volumes (18, 19).

4. Gear unit according to claim 3, characterized in that the Aktuatorgrundeinheit (15) has an Aktuatorkolben (20), which is intended to be arranged axially between the working volume (18, 19).

5. Transmission unit according to claim 4, characterized in that the Aktuatorkolben (20) has at least two Aktuatorkolbenelemente (21, 22) which are each provided for one of the working volume (18, 19).

6. Transmission unit according to one of the preceding claims, characterized in that the Betätigungsaktuator (12) has a fixing unit (23) which is intended to connect at least a part of the Betätigungsaktuators (12) fixed to the transmission housing part (10).

7. Gear unit according to claim 6, characterized in that the fastening unit (23) at least partially in one piece with the Aktuatorgrun- unit (15) is formed.

8. Transmission unit according to claim 7, characterized in that the fastening unit (23) is formed at least partially integral with an actuator cylinder (17) of the actuator base unit (15).

9. Transmission unit at least according to claim 6, characterized in that the fastening unit (23) is provided for an operating supply of at least part of the actuator base unit (15).

10. Transmission unit at least according to claim 6, characterized in that the fastening unit (23) is provided to connect the Aktuatorgrundeinheit (15) on both sides with a transmission housing (24).

11. Transmission unit according to one of the preceding claims, characterized by a second Betätigungsaktuator (25) corresponding to the first actuation actuator (12) is arranged and which is intended to actuate at least one second gear shift element (26).

12. A gear unit according to claim 11, characterized in that the second Betätigungsaktuator (25) has a Aktuatorgrundeinheit (27) which is arranged coaxially with the Aktuatorgrundeinheit (15) of the first Betätigungsaktuators (12).

13. Transmission unit according to claim 11 or 12, characterized in that the first Betätigungsaktuator (12) and the second Betätigungsaktuator (25) are at least partially made in one piece.