Transmission device for drive train of motor vehicle, in particular motor vehicle

Abstract

The invention relates to a transmission (10), comprising a disc clutch (14), which has a disc seat (16) and a disc pack (18), which comprises discs (20, 21, 22, 23, 24) arranged one behind the other in the axial direction of the disc clutch (14), two discs (20, 22) of which are designed as end discs (21, 23). The transmission also has a first shift (28), by means of which the disk group (18) can be actuated in a first actuation direction (30) extending in the axial direction of the disk clutch (14) by means of a first one of the end disks (21, 23). According to the invention, a second shifting element (34) is provided opposite the first shifting element (28) in the axial direction of the disc clutch (14), whereby the disc pack (18) can be actuated by means of a second end disc (23) in a second actuation direction (38) extending in the axial direction of the disc clutch (14) and opposite the first actuation direction (30), the second end disc is directly supported on the disc seat (16) in the second operating direction (38) and is directly supported on the component (40) in the first operating direction (30).

Description

Technical Field

[0001] The invention relates to a transmission for a drive train of a motor vehicle, in particular a car, according to the preamble of claim 1 . Background Art

[0002] DE 10 2007 027 120 B4 discloses a clutch device for a dual clutch of an automatic or automated dual clutch transmission of a motor vehicle. Summary of the invention

[0003] The object of the present invention is to provide a transmission for a drive train of a motor vehicle, in particular a motor vehicle, which allows a particularly compact design.

[0004] This object is achieved by a transmission having the features of claim 1. Advantageous embodiments with suitable developments of the invention are described in the dependent claims.

[0005] The invention relates to a transmission for a drive train of a motor vehicle (also referred to as a vehicle for short), which is preferably designed as a car, in particular a sedan. This means that the motor vehicle has the transmission in its fully manufactured state. For example, the motor vehicle can be driven by the transmission, in particular by a drive engine of the motor vehicle. For example, the drive engine can be an internal combustion engine, but it can also be an electric motor, so the motor vehicle is designed as a hybrid vehicle, but it can also be designed as an electric vehicle, in particular a battery electric vehicle (BEV). The transmission has a disc clutch, which is arranged, for example, in a housing (also referred to as a transmission case) of the transmission. The disc clutch has at least one disc seat and a disc pack, which is carried by the disc seat and is thus held on the disc seat. The disc pack has a plurality of discs, which are arranged one after another in the axial direction of the disc clutch. In particular, exactly two of the discs of the disc pack are end discs, which are also referred to as first discs. The other remaining discs of the disc pack, in particular all the remaining discs of the disc pack, are also referred to as second discs and are arranged between the end discs in the axial direction of the disc clutch.

[0006] The transmission device has a first shifting element, by which the disk pack can be operated in a first operating direction extending along the axial direction of the disk clutch through a first end disk thereof. This particularly means that the first shifting element can exert a first force on the disk pack through the first end disk in the first operating direction to operate the disk pack, particularly to press or compress the disk pack.

[0007] In order to achieve a highly advantageous transmission function and thus a particularly compact design in a particularly space-efficient manner, the invention provides that the transmission has a second shifting element, which is particularly provided in addition to the first shifting element and is arranged opposite the first shifting element in the axial direction of the disk clutch. The first disk and the second disk of the disk pack are arranged between the shifting elements, particularly in the axial direction of the disk clutch. The disk pack can be actuated by means of the second shifting element in a second actuation direction extending in the axial direction of the disk clutch and opposite to the first direction via the second end disk, in particular in such a way that a second force can be exerted on the disk pack by the second shifting element in the second actuation direction via the second end disk. For example, a so-called disengagement force can be exerted on the disk pack in order, for example, to separate the disks of the disk clutch from one another and thus to disengage the clutch. In other words, the second force is or generates the disengagement force, so that the second force is a disengagement force for disengaging the disk clutch, in particular to separate the disks of the disk pack from one another. For example, the disk clutch can be engaged by means of the first force, in particular in such a way that the disk pack is pressed together by means of the first force. If the disk clutch is engaged, it is, for example, in an engaged state, in which two components are connected to one another in a rotationally fixed manner, for example, by means of the disk clutch. If the disk clutch is disengaged, it is, for example, in a disengaged state, in which the disk clutch allows, in particular, relative movements between the components about the longitudinal axis of rotation.

[0008] The second end disc is supported directly on the disc seat in the second operating direction. In the first operating direction, the second end disc is supported directly on a component of the second shifting element and thus on the second shifting element. This makes it possible to efficiently fix the disc pack in the structural space, wherein the second end disc is subjected to force on both sides, especially in the following way, from the axial point of view of the disc clutch, i.e., the second end disc is supported directly on the disc seat in the second operating direction and therefore on one side, and is supported directly on a component of the second shifting element in the first operating direction and therefore on the other side. The present invention therefore provides a combined solution for the clearance-free axial support of the disc pack, especially when it is necessary to simultaneously support the torque and to absorb the reverse axial force component of the second shifting element.

[0009] The present invention assumes in particular that the disk pack of the disk clutch is usually fixed in the axial direction in the tooth row of the disk seat by a clamping ring or a fixing ring. For example, the disk seat is an inner disk seat or an outer disk seat. For example, the disk seat is a housing. In other words, it is conceivable that the disk seat is formed in one piece with the housing, so that the housing and the disk seat are formed by a single part. It is also conceivable that the disk seat and the housing are formed separately and are connected to each other in a rotationally fixed manner. In the conventional solutions, it is not possible to achieve axial force on both sides of the respective end disk without affecting the disk pack, but this can now be achieved by the present invention. As soon as a force acting in the opposite direction to the axial force acts on the disk pack during the shifting process in the conventional solutions, this can have a significant negative impact on the shifting quality of the transmission in the motor vehicle. In addition, since the conventional clamping ring or fixing ring has a small and non-centered bearing surface, unfavorable surface pressures occur in the disk pack. The above-mentioned problems and disadvantages can now be avoided by the present invention.

[0010] The tooth row of the disk seat is also called seat tooth row, for example. The seat tooth row has, for example, an axial groove, in particular in the form of a tooth gap, which is open, for example, in the axial direction of the disk clutch toward the component of the second shifting element. On the circumference of the disk clutch extending around the axial direction of the disk clutch, for example, between each two adjacent axial grooves, a tooth section, in particular a remaining tooth section, is provided as a respective tooth of the seat tooth row, wherein, for example, a disk can or has been supported on the teeth of the seat tooth row on the circumference extending around the axial direction of the disk package, so that the disk engages with the disk seat in a torque-transmitting and in particular rotationally fixed manner in the circumference of the disk clutch. In particular, the disk meshes with the seat tooth row.

[0011] For example, the second end disk has a friction surface, which, for example, faces the second disk (also called intermediate disk) in the axial direction of the disk clutch. The invention hereby enables a fixed position or positioning of the friction surface of the second inner disk in a space-saving manner, in particular even when axial forces act on both sides, in particular on the second end disk. In particular, compared to conventional solutions, the invention allows a saving of axial construction space, in particular for the installation of a fixing ring (for example for axial fixing or limiting of the second end disk). Compared to conventional solutions, the invention can improve the shifting comfort for a disk clutch (for example designed as a disk brake), because, for example, an axially centered force transmission of axial forces acting on the second end disk can be achieved. Compared to the use of conventional fixing rings, excessive tilting of the second end disk can be avoided.

[0012] In an advantageous embodiment of the invention, it is provided that the component which is supported directly on the second end disk in the second operating direction is supported directly on the stopper in the first operating direction, and the stopper is fixed at least indirectly to the base component of the transmission in the axial direction of the disk clutch. The base component can be a housing. In other words, it is conceivable that the base component and the housing are formed integrally with each other, so that the base component and the housing are formed from a single part. It is also conceivable that the base component is formed separately from the housing and is connected to the housing in a rotationally fixed manner and immovably in the axial direction of the disk clutch. This can show a structurally advantageous fixation of the component and the second disk.

[0013] Another design of the invention is characterized in that the stopper is designed as a wedge ring, which has two wedge surfaces facing away from each other in the axial direction of the disk clutch and extending outwards toward each other in the radial direction of the disk clutch. As a result, a play-free adjustment of the disk pack can be achieved in a very compact manner, especially by means of the component and the second end disk.

[0014] In another particularly advantageous embodiment of the invention, the disks of the disk pack, i.e. the first disk and the second disk, each have a first tooth row, which meshes with a corresponding second tooth row of the disk seat. Thus, for example, the second tooth row is the aforementioned seat tooth row. As a result, the disks of the disk pack are supported on the disk seat in the circumferential direction of the disk clutch extending around the axial direction of the disk clutch and are thus coupled to the disk seat in a torque-transmitting manner, in particular in a rotationally fixed manner, in particular for torques extending in the circumferential direction of the disk clutch.

[0015] In order to achieve a particularly compact structure in the axial direction, it is provided in another embodiment of the invention that the second tooth row has at least two, in particular at least or exactly three, teeth which are set back in the axial direction and thus form respective axial end faces, and the corresponding teeth of the first tooth row of the second end disk are directly supported on the end faces of said teeth in the second actuation direction. This ensures that the second end disk is directly supported on the disk seat in a space-saving manner. It has also been found to be particularly advantageous that the teeth of the first tooth row of the second end disk which are directly supported on the end faces in the second actuation direction each have a first extension extending in the circumferential direction of the disk clutch, which first extension is greater than the second extension of the first tooth row of the second end disk, in particular all the other teeth, each extending in the circumferential direction of the disk clutch. This allows the second end disk to be supported reliably and in accordance with regulations on the disk seat, even against large axial forces.

[0016] In order to avoid excessive local forces or peak forces and thus to achieve a particularly compact construction, a further embodiment of the invention provides that the teeth of the first tooth row of the second end disk which bear against the end face in the second actuating direction are distributed uniformly in the circumferential direction of the disk clutch.

[0017] In order to realize a particularly advantageous transmission function in a particularly space-efficient manner, it is provided in another design of the invention that the third tooth row corresponding to the second tooth row of the component of the second shifting element meshes with the second tooth row, so that the component is supported or can be supported on the disc seat in the circumferential direction of the disc clutch. Therefore, the component is a toothed component, which is supported on the disc seat in the circumferential direction of the disc clutch in a similar manner to the disc set by the corresponding second tooth row. Both the component and the second end disc can be fixed without clearance, especially by a wedge ring. Therefore, both the disc set and the second shifting element can withstand axial forces without affecting each other. In addition, the circumferential load of the second shifting element can be supported on the disc seat and thus, for example, on the housing by the component, and in particular, be introduced into the disc seat and thus, for example, into the housing. Therefore, it is particularly conceivable that both the disc and the component designed as the base of the second shifting element (for example, also called a seat) are connected to the disc seat in a rotationally fixed manner by the second tooth row of the disc seat, and thus, for example, in a rotationally fixed manner to the housing. In particular, the present invention allows an integral torque support of the second shifting element. Furthermore, a particularly advantageous surface pressure distribution within the disk package can be achieved by the invention, in particular by at least substantially centrally supporting the second end disk and thereby supporting the second disk on the component.

[0018] In order to achieve a particularly compact design, it is provided, for example, that the second shifting element is designed as a claw shifting element and that the component is designed as a base element of a claw shifting element half of the claw shifting element.

[0019] It is also conceivable that the two shifting elements are brake shifting elements. In this case, it is conceivable that the components form the housing, that is, are formed in one piece with the housing, or that the components are formed separately from the housing and are connected to the housing in a rotationally fixed manner.

[0020] Further advantages, features and details of the invention are obtained from the following description of preferred embodiments in conjunction with the accompanying drawings. The features and feature combinations mentioned above in the description and the features and feature combinations mentioned below in the description of the drawings and / or shown individually in the drawings can be used not only in the respectively indicated combination but also in other combinations or alone without exceeding the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings show:

[0022] Figure 1 A schematic longitudinal section diagram of a portion of a transmission device for a motor vehicle drive train is shown,

[0023] Figure 2 Another schematic longitudinal section diagram showing a part of the transmission device,

[0024] Figure 3 A schematic front view of a second end disc of the transmission is shown. DETAILED DESCRIPTION

[0025] In the figures, identical or functionally identical components are provided with the same reference symbols.

[0026] Figure 1 A detail of a transmission 10 for a drive train of a motor vehicle (also referred to as vehicle for short) is shown in a schematic longitudinal section. The transmission 10 has a housing 12, also referred to as a gearbox housing, and a disk clutch 14 arranged in the housing 12. The disk clutch 14 has a first disk seat 16 and a second disk seat 17. The disk seat 16 is an outer disk seat and the disk seat 17 is an inner disk seat. For example, the disk seat 16 is connected to the housing 12 in a rotationally fixed manner. For example, the disk seat 16 is formed integrally with the housing 12. If the disk clutch 14 is disengaged, i.e. removed, for example, the disk seat 17 is rotatable relative to the disk seat 16 and therefore relative to the housing 12 about the component rotation axis. If the disk clutch 14 is engaged, i.e. engaged, for example, the disk seat 17 is connected to the disk seat 17 and therefore to the housing 12 in a rotationally fixed manner.

[0027] The disk clutch 14 has a disk package 18, which has disks 20, 22 and 24. The disk clutch 14 also has disks 26, which can be part of the disk package 18 or of another disk package. The disks 20 and 22 are also referred to as first disks of the disk package 18 and are the end disks of the disk package 18. The disks 24, 26 are also referred to as second disks. Figure 1 In the embodiment shown, the disk 24 is an outer disk, which, as well as the end disks 20, 22, which are also designed as outer disks, are placed on the outer disk seat (disk seat 16). The disks 20, 22 and 24 are supported on the outer disk seat, especially in the circumferential direction around the axial extension of the disk clutch 14, and are therefore connected to the outer disk seat in a torque-transmitting, especially rotationally fixed manner, especially the torque extending in the axial direction of the disk clutch 14. The disk 26 is an inner disk placed on the inner disk seat (disk seat 17). The inner disk is supported on the inner disk seat in the circumferential direction of the disk clutch 14, and is therefore connected to the inner disk seat in a torque-transmitting, especially rotationally fixed manner. The inner disk and the outer disk are arranged alternately in succession in the axial direction of the disk clutch 14. The previously disengaged disk clutch 14 is, for example, engaged in the following manner, that is, the disk set 18 is pressed together, that is, pressed, in particular with the disk 26 (therefore, the disks 20, 22, 24 and 26) in the axial direction of the disk clutch 14. The previously engaged disk clutch 14 is disengaged in such a way that, for example, the disks 20, 22, 24, 26 of the disk package 18 are separated from one another in the axial direction of the disk clutch 14. This is done, for example, by an axial force acting axially on the disk package 18 together with the disk 26, which is caused by, for example, an axial force acting axially on the disk package 18 together with the disk 26, or is such an axial force. The end disk 20 is also referred to as the first end disk 21, and the end disk 22 is also referred to as the second end disk 23. If the disk package 18 is mentioned below, this refers to the disk package 18 including the disks 20, 22, 24 and 26.

[0028] The transmission 10 has a first shifting element 28, by means of which the disk set 18 is shifted in a direction extending in the axial direction of the disk clutch 14. Figure 1 In the first operating direction indicated by the arrow 30, the shifting element 28 can be operated and thus, for example, can be pressed, so that, for example, the disk clutch 14 is engaged. In particular, the shifting element 28 can exert a first force indicated by the arrow 30 on the first end disk 21 and via the disk package 18 in the first operating direction indicated by the arrow 30, so that, for example, the disk package 18 is pressed and thus the disk clutch 14 that was previously disengaged is engaged.

[0029] The transmission 10 has a second shifting element 34 which is provided in addition to the first shifting element 28 and which is arranged opposite the first shifting element 28 in the axial direction of the disk clutch 14. By means of the second shifting element 34, the disk pack 18 can be actuated in a second actuation direction which extends in the axial direction of the disk clutch 14 and is opposite to the first direction and is indicated by an arrow 36. Thus, for example, the second shifting element 34 can exert a second force on the second end disk 23 and via the second end disk 23 also on the disk pack 18 in the second actuation direction, which second force can be the aforementioned axial force or the aforementioned axial force, or generate the aforementioned axial force. Thus, for example, the shifting element 34 can disengage the disk clutch 14. It can be seen that the disk pack 18 can be actuated via the second end disk 23 in the second actuation direction by means of the shifting element 32, so that in particular the disk clutch 14 is disengaged.

[0030] The second end disk 23 is supported directly on the outer disk seat in the second operating direction and directly on the component 40 of the second shifting member 34 in the first operating direction. The component 40 supported directly on the second end disk 23 in the second operating direction is supported directly on the stop member 42 in the first operating direction, which is fixed at least indirectly, in particular directly, to the base member 44 of the transmission 10 in the axial direction of the disk clutch 14, in particular in the following manner, i.e., relative movement between the base member 44 and the stop member 42 in the axial direction of the disk clutch 14 is prohibited. Figure 1 In the exemplary embodiment shown, the base element 44 is the housing 12. Alternatively, it is conceivable that the base element 44 is designed separately from the housing 12 and is connected to the housing 12.

[0031] exist Figure 1 In the illustrated embodiment, the stopper 42 is designed as a wedge ring having wedge surfaces 46 , 48 facing away from each other in the axial direction of the disk clutch 14 and gradually approaching each other in the radial direction of the disk clutch 14 .

[0032] Figure 3The second end disk 23 is shown in the front schematic view. Taking the second end disk 23 as an example, it can be seen that the disks 20, 22 and 24 of the disk set 18 each have a first tooth row 50 designed as an outer tooth row. The outer disk seat has a second tooth row designed as an inner tooth row corresponding to the respective first tooth row 50. A part of the second tooth row can be seen from Figure 2 The tooth rows 50 and 52 mesh with each other, so that the disks 20, 22 and 24 of the disk pack 18 mesh with the outer disk seat through the tooth rows 50, 52.

[0033] Can be obtained from Figure 2 It can be clearly seen that the second tooth row 50 has at least or exactly two, in particular at least or exactly three teeth that are set back in the axial direction of the disk clutch 14, one of which is Figure 2 In the figure, the teeth 54 are indicated by 54. Thus, each tooth 54 forms an axial end face 56 as a contact surface, wherein the corresponding tooth 58 of the first tooth row 50 of the second end disk 23 directly bears against the end face 56 in the second operating direction. Figure 3 It can be seen that the teeth 58 of the tooth row 50 directly supported on the end face 56 in the second actuation direction each have a first extension extending in the circumferential direction of the disk clutch 14, which is greater than the corresponding second extension of all other teeth 60 of the tooth row 50 extending in the circumferential direction of the disk clutch 14. Figure 3 , the teeth 58 and the end faces 56 are therefore evenly distributed over the circumference of the disk clutch 14 about the axial extension, so that, for example, the teeth 58 are spaced 120 degrees apart from one another in pairs over the circumference of the disk clutch 14 .

[0034] In addition, you can Figure 2 , it can be seen that the component 40 of the second shifting element 34 has a third tooth row 62, which corresponds to the second tooth row 52 and meshes with the second tooth row 52, ​​so that the component 40 and the second shifting element 34 are therefore supported in the circumferential direction of the disk clutch 14, in particular on the disk seat 16 and thus on the housing 12, that is, the component 40 and the second shifting element 34 are therefore connected to the outer disk seat and thus connected to the housing 12 in a rotationally fixed manner. The component 40 can be a base, in particular a sliding sleeve base. In particular, the wedge ring allows a clearance-free adjustment, in particular via the second end disk 23.

[0035] Reference numerals list

[0036] 10 Transmission

[0037] 12 Shell

[0038] 14-disc clutch

[0039] 16 First Plate Seat

[0040] 17 Second Plate

[0041] 18-plate set

[0042] 20 plates

[0043] 21 First End Plate

[0044] 22 plates

[0045] 23 Second end plate

[0046] 24 plates

[0047] 26 plates

[0048] 28 First shift piece

[0049] 30 arrows

[0050] 32 Arrows

[0051] 34 Second shift piece

[0052] 36 Arrows

[0053] 38 Arrows

[0054] 40 components

[0055] 42 limiter

[0056] 44 base pieces

[0057] 46 wedge surface

[0058] 48 wedge surface

[0059] 50First dentition

[0060] 52 Second dentition

[0061] 54 teeth

[0062] 56 end face

[0063] 58 teeth

[0064] 60 teeth

[0065] 62Third dentition

Claims

1. A transmission device (10) for a motor vehicle drive train, comprising: - a disk clutch (14), comprising at least one disk carrier (16) and a disk package (18), the disk package comprising disks (20, 21, 22, 23, 24) arranged one after the other in the axial direction of the disk clutch (14), two of the disks (20, 22) being designed as end disks (21, 23), the remaining disks (24) of the disk package (18) being arranged between the end disks, a first shifting element (28), by means of which the disk package (18) can be actuated in an actuating direction (30) extending in the axial direction of the disk clutch (14) via a first of the end disks (21, 23), - a second shifting element (34) which is axially opposite to the first shifting element (28) of the disk clutch (14), in, The second end disk (23) is supported directly on the disk seat (16) in a supporting direction extending along the axial direction of the disk clutch (14) and opposite to the operating direction (30), and is supported directly on a component (40) of the second shifting element (34) in the operating direction (30). The disks (20, 21, 22, 23, 24) of the disk set (18) respectively have a first tooth row (50), which meshes with a corresponding second tooth row (52) of the disk seat (16), so that the disks (20, 21, 22, 23, 24) of the disk set (18) are supported on the disk seat (16) in the circumferential direction of the disk clutch (14), and The second tooth row (52) has at least two teeth (54) which are set back in the axial direction and thereby form corresponding axial end faces (56), on which corresponding teeth (58) of the first tooth row (50) of the second end disk (23) are directly supported in the supporting direction (38).

2. The transmission device (10) according to claim 1, characterized in that The component (40) supported directly on the second end disk (23) in the supporting direction (38) is supported directly on a stop member (42) in the operating direction (30), and the stop member is at least indirectly fixed to a base member (44) of the transmission device (10) in the axial direction of the disk clutch (14).

3. The transmission device (10) according to claim 2, characterized in that: The stop member (42) is designed as a wedge ring and has two wedge surfaces (46, 48) facing away from each other in the axial direction of the disk clutch (14) and extending outwardly toward each other in the radial direction of the disk clutch (14).

4. The transmission device (10) according to one of the preceding claims, characterized in that The teeth (58) of the first tooth row (50) of the second end disk (23) supported on the end face (56) each have a first extension extending in the circumferential direction of the disk clutch (14), the first extension being greater than a corresponding second extension of the other teeth (60) of the first tooth row (50) of the second end disk (23) extending in the circumferential direction of the disk clutch (14).

5. The transmission device (10) according to claim 4, characterized in that: The teeth (58) of the first tooth row (50) of the second end disk (23) supported on the end surface (56) are evenly distributed in the circumferential direction of the disk clutch (14).

6. The transmission device (10) according to one of the preceding claims, characterized in that A third tooth row (62) of the component (40) corresponding to the second tooth row (52) meshes with the second tooth row (52), so that the component (40) is supported or can be supported on the disk seat (16) in the circumferential direction of the disk clutch (14).

7. The transmission device (10) according to one of the preceding claims, characterized in that The second shifting element (34) is designed as a claw shifting element, and the component (40) is designed as a base element of a claw shifting element half of the claw shifting element.

8. The transmission device (10) according to one of the preceding claims, characterized in that Both shift elements (28, 34) are brake shift elements.

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