Torque transmission device having support means in a housing interior

Abstract

The invention relates to a torque transmission device (10) for a drive train of a vehicle, having: a housing (12) with a first housing wall (14) and an axially opposite second housing wall (16) connected thereto, and with a housing interior (18) formed axially between at least the first and second housing walls (14, 16); within the housing interior (18), at least one gear stage (28) with at least one first gearwheel (32) rotatable about an axis of rotation (30) and a second gearwheel (34) which intermeshes therewith for torque transmission; wherein the first and second gearwheels (32, 34) are mounted on the housing (12); wherein the first housing wall (14) is supported axially with respect to the second housing wall (16) via support means (84) arranged within the housing interior (18).

Description

[0001] P240951 DE

[0002] -1-

[0003] Torque transmission device with support means in a housing interior

[0004] Description introduction

[0005] The invention relates to a torque transmission device according to the preamble of claim 1.

[0006] In DE 102013 215 737 A1 a torque transmission device designed as a hybrid module is described which is connected to an electric motor arranged coaxially between an internal combustion engine and a gearbox.

[0007] The object of the present invention is to increase the stiffness of the torque transmission device. The torque transmission device should be designed to be space-saving and cost-effective.

[0008] At least one of these problems is solved by a torque transmission device with the features according to claim 1. This allows the stiffness of the torque transmission device to be increased without increasing the required installation space. The axial and tangential forces introduced onto the housing by the gear engagement can be better supported.

[0009] The specified directions refer to the axis of rotation of the first gear. The radial direction is therefore perpendicular to the axis of rotation, and the axial direction is parallel to the axis of rotation.

[0010] The torque transmission device can be arranged to transmit drive torque for propelling the vehicle. The torque transmission device can be connected to an internal combustion engine on one side and to at least one electric motor on the other. The torque transmission device can transmit torque from the internal combustion engine and, alternatively or additionally, torque from the electric motor, particularly towards a transmission of the vehicle.

[0011] The torque transmission device can be effectively arranged between the internal combustion engine, the electric motor, and the transmission for torque transmission. P240951 DE

[0012] -2-

[0013] The torque transmission device can be arranged axially between the internal combustion engine and the transmission. The internal combustion engine and the electric motor can be arranged on the same axial side with respect to the torque transmission device.

[0014] The torque transmission device may include a torsional vibration damper and / or a disconnect clutch, in particular a knock-out clutch. The disconnect clutch can selectively decouple the internal combustion engine from a torque connection between the electric motor and an output, for example, a transmission input shaft.

[0015] The torque transmission device can be a hybrid module. The torque transmission device can include the electric motor or be connectable to it.

[0016] The first and second housing walls can be connected by form-fit, force-fit, and / or material-fit connections. The first and second housing walls can be detachably connected. The first and / or second housing wall can be a cast component.

[0017] The housing interior may contain a torsional vibration damper and / or a disconnect coupling, in particular a knock-out coupling. The housing interior may be at least partially filled with a lubricant, for example, lubricating oil or grease.

[0018] The first gear can have more teeth than the second gear. The gear stage can create a gear ratio or a reduction. The gear stage can be effectively positioned between the electric motor and an output, such as a gearbox input shaft, for torque transmission.

[0019] A stiffening structure on an outer surface of the housing facing away from the housing interior to increase the stiffness of the housing can be omitted.

[0020] The first and second gears can mesh with each other via helical teeth. This reduces gear noise during operation of the gear stage.

[0021] The first and / or second gear can be mounted on the first and / or second housing wall via at least one bearing element, in particular a rolling bearing. The first gear can be mounted on the first housing wall via at least one first bearing element, in particular a rolling bearing. The second gear can be mounted on the first housing wall via at least one second bearing element, in particular a rolling bearing. P240951 DE

[0022] The second gear may be mounted on the second or first housing wall via at least one third bearing element, in particular a rolling bearing. The second and / or third bearing element may be arranged radially outside of the first bearing element.

[0023] The support means can comprise at least one support element within the housing interior. The support means can comprise several support elements within the housing interior. The support elements can be arranged circumferentially offset from one another. The support elements can be arranged on the same or different diameters with respect to the axis of rotation.

[0024] The support elements can include stiffening elements, such as ribs, material reinforcements, and / or struts. The support elements can facilitate fluid flow for the lubricant within the housing interior. This fluid flow can involve deflection, conveyance, or drainage of the lubricant.

[0025] In a preferred embodiment of the invention, it is advantageous if the support means are formed integrally from the first and / or second housing wall. The support means can be formed separately from the first and / or second housing wall and / or be connected to the first and / or second housing wall.

[0026] In a preferred embodiment of the invention, the support means are arranged radially within the housing interior between an outer circumference of the housing and the axis of rotation. The support means can be arranged radially outside the first gear. The support means can be arranged at least partially radially overlapping with the second gear. The support means can be surrounded circumferentially and / or at least radially inside and radially outside by the free space of the housing interior. The support means can be arranged in a central region with respect to the radial direction between the outer circumference of the housing and the axis of rotation.

[0027] A preferred embodiment of the invention is advantageous in which the support means comprise a first axial projection arranged on the first housing wall and / or a second axial projection arranged on the second housing wall. A transition between the first axial projection and the first housing wall may be rounded. A transition between the second axial projection and the second housing wall may also be rounded.

[0028] The first axial projection can, in particular directly, abut the second axial projection. The first axial projection can be defined by a radial section of P240951 DE.

[0029] -4- The first housing wall may project axially. A transition between the first axial projection and the first housing wall may be rounded. A transition between the first axial projection and the first housing wall may include support means, in particular stiffening means, for example, ribs, material reinforcements, and / or struts. The support means may extend from the first axial projection along the radial section of the first housing wall. A transition between the second axial projection and the second housing wall may be rounded. A transition between the second axial projection and the second housing wall may include support means, in particular stiffening means, for example, ribs, material reinforcements, and / or struts. The support means may extend from the second axial projection along the radial section of the second housing wall.

[0030] In a particular embodiment of the invention, it is advantageous if the first axial projection is integrally formed with the first housing wall and / or the second axial projection is integrally formed with the second housing wall. The first axial projection can extend axially from a radial section of the first housing wall. The second axial projection can extend axially from a radial section of the second housing wall.

[0031] In a preferred embodiment of the invention, the first and / or second axial projection has a circular cross-section when viewed in the axial direction. The first and / or second axial projection can be cylindrical.

[0032] In a particular embodiment of the invention, it is advantageous if the first and / or second axial projection has an opening for receiving a connecting element for axially clamping the first and second housing walls. The support means can accommodate several connecting elements. The connecting element can fasten the first and second housing walls together. The first and second housing walls can be axially connected to each other, particularly primarily, via the connecting elements received in the support means.

[0033] A preferred embodiment of the invention is advantageous in which the connecting element is a screw element. The screw element can be inserted into a through-hole in the second axial projection and bear against the second axial projection with a screw head. The screw element can engage in an internal thread in the opening of the first axial projection.

[0034] A preferred embodiment of the invention is advantageous in which the second gear is arranged coaxially to a rotor shaft that can be connected to a rotor of an electric motor P240951 DE

[0035] -5- is. The second gear can be rotatably connected to the rotor shaft. The second gear can be formed as a single unit with the rotor shaft. The electric motor can be arranged parallel to the axis of the first gear. The second gear can transmit torque from the rotor to the second gear via the gear mesh.

[0036] In a particular embodiment of the invention, it is advantageous if the support means are arranged circumferentially offset and / or radially overlapping with the second gear. The support means can be arranged in the radial direction within the area of ​​the gear mesh.

[0037] Further advantages and advantageous embodiments of the invention will become apparent from the description of the figures and the illustrations.

[0038] Character description

[0039] The invention is described in detail below with reference to the illustrations. These show, in detail:

[0040] Figure 1: A section of a cross-section of a torque transmission device in a special embodiment of the invention.

[0041] Figure 2: A section of another cross-section of the torque transmission device from Figure 1.

[0042] Figure 3: A section of another cross-section of the torque transmission device from Figure 1.

[0043] Figure 4: A side view of the first housing wall of the torque transmission device from Figure 1.

[0044] Figure 1 shows a section of a cross-section of a torque transmission device in a special embodiment of the invention. The torque transmission device 10 for a vehicle drive train comprises a housing 12 with a first housing wall 14 and an axially opposite second housing wall 16, and a housing interior 18 formed axially between at least the first housing wall 14 and the second housing wall 16. The first housing wall 14 has a first axial section 20 radially outward, and the second housing wall 16 has a second axial section 22 radially outward. P240951 DE adjoins the first axial section 20 radially outward.

[0045] -6- again a first radial section 24 and a second radial section 26 adjoins the second axial section 22 radially outside. The first and second radial sections 24, 26 are axially adjacent to each other.

[0046] Within the interior of the housing 18, a gear stage 28 is arranged with a first gear 32 rotatable about a pivot axis 30 and thus engaging with a second gear 34 via helical teeth. The first gear 32 is integrally formed with a rotor shaft 36. The rotor shaft 36 can be rotatably connected to a rotor of an electric motor. Torque from the rotor can be transmitted via the rotor shaft 36 and the first gear 32 to the second gear 34.

[0047] The first gear 32 is mounted on the housing 12, in particular on the first housing wall 14, via a first bearing element 38, in particular a double-row rolling bearing. The second gear 34 is mounted on the housing 12, in particular on the first housing wall 14, via a second bearing element 40, in particular a rolling bearing, and on the second housing wall 16 via a third bearing element 42, in particular a rolling bearing.

[0048] A first sealing element 44, in particular a radial shaft seal, is arranged between the first gear 32 and the first housing wall 14, and a second sealing element 46, in particular a radial shaft seal, is arranged between the rotor shaft 36 and the second housing wall 16, each for sealing the housing interior 18. This allows the housing interior 18 to be at least partially filled with a lubricant and prevents the lubricant from leaking out at the bearing points.

[0049] A torsional vibration damper 48 is arranged in the housing interior 18, comprising at least one spring element 50, a damper inlet 52, and a damper outlet 54 which is rotatable relative to the damper inlet 52 against the action of the spring element 50 to a limited extent. The damper inlet 52 is connected to a drive hub 56, which can be connected to an internal combustion engine to introduce torque into the torque transmission device 10.

[0050] With regard to torque transmission between the internal combustion engine and the first gear 32, a disconnect clutch 58 is effectively arranged downstream of the torsional vibration damper 48. Depending on the actuation state of an actuating device 60, the disconnect clutch 58 can enable or interrupt torque transmission between the internal combustion engine and the first gear 32. The disconnect clutch 58 comprises a multi-plate assembly 62 with two friction plates 64, which are positively engaged in the damper outlet 54, and a counter plate 66, which is axially positioned between the two friction plates 64 and the damper outlet 54.

[0051] -7-

[0052] Friction plates 64 are arranged and are connected to the first gear 32 for torque transmission.

[0053] The clutch pack 62 can be subjected to an axial force, which closes the disconnect clutch 58 to transmit a torque between the damper outlet 54 and the first gear 32. A disc spring 68 exerts the axial force on the clutch pack 62 via a piston element 70. Depending on actuation by the actuating device 60, the piston element 70 can actuate the disc spring 68 against the spring force, thereby decoupling the clutch pack 62 from the spring force and opening the disconnect clutch 58 to interrupt the torque transmission between the damper outlet 54 and the first gear 32.

[0054] The actuating device 60 comprises an actuating bearing 72, a ramp mechanism 74, and an actuating transmission 76 with a first actuating gear 78 and a second actuating gear 80 rotatable by an actuator and in meshing with the first actuating gear 78. When the first actuating gear 78 is rotated by the second actuating gear 80, the piston element 70 is deflected via the ramp mechanism 74 and the actuating bearing 72 against the spring force of the disc spring 68 to open the disconnecting clutch 58.

[0055] The piston element 70 extends axially through a recess 82 in the first gear 32. The actuating device 60 is arranged on a side of the first gear 32 axially opposite the clutch pack 62. The actuating bearing 72 is arranged radially inside the clutch pack 62.

[0056] Figure 2 shows a section of another cross-section of the torque transmission device from Figure 1. The torque transmission device 10 comprises the housing 12 with the first housing wall 14 and the axially opposite second housing wall 16. Within the housing interior 18 formed axially between the first and second housing walls 14, 16, support means 84 are arranged to axially support the first housing wall 14 relative to the second housing wall 16. The support means 84 provide stiffening against axial and tangential forces that arise from the helical gearing of the meshing between the first and second gears 32, 34.

[0057] The support means 84 are arranged radially within the housing interior 18 between an outer circumference 86 of the housing 12 and the axis of rotation 30 and comprise a first axial projection 88 arranged on the first housing wall 14 and an axial projection 88.

[0058] -8- The second axial projection 90 is located adjacent to the first axial projection 88 and arranged on the second housing wall 16. The first axial projection 88 is integrally formed with the first housing wall 14, and the second axial projection 90 is integrally formed with the second housing wall 16. The first and second axial projections 88, 90 are arranged to overlap radially, at least partially, the second gear 34.

[0059] The first and second axial projections 88, 90 each have an opening 92 for receiving a connecting element 94 for axially clamping the first and second housing walls 14, 16. The opening 92 in the first axial projection 88 is a through-hole 96 through which the connecting element 94 extends axially, and the opening 92 in the second axial projection 90 is an internal bore 98 with an internal thread into which the connecting element 94, designed as a screw element 100, engages.

[0060] Figure 3 shows a section of another cross-section of the torque transmission device from Figure 1. The first and second axial projections 88, 90 have a circular cross-section when viewed axially and are cylindrical. Several such first and second axial projections 88, 90 can be arranged offset from one another in the circumferential direction.

[0061] Figure 4 shows a side view of the first housing wall of the torque transmission device from Figure 1. The first housing wall 14 includes radially outside the first radial section 24 and radially inside it the first axial projection 88 with the opening 92 for receiving the connecting element.

[0062] P240951 DE

[0063] Reference symbol list

[0064] 10 Torque transmission device

[0065] 12 cases

[0066] 14 first case wall

[0067] 16 second case wall

[0068] 18 Case interior

[0069] 20 first axial section

[0070] 22 second axial section

[0071] 24 first radial section

[0072] 26 second radial section

[0073] 28 gear stages

[0074] 30 Rotary axis

[0075] 32 first gear

[0076] 34 second gear

[0077] 36 Rotor shaft

[0078] 38 first bearing element

[0079] 40 second bearing element

[0080] 42 third bearing element

[0081] 44 first sealing element

[0082] 46 second sealing element

[0083] 48 torsional vibration dampers

[0084] 50 spring element

[0085] 52 Damper Inlet

[0086] 54 Damper outlet

[0087] 56 Drive hub

[0088] 58 Disconnect coupling

[0089] 60 Actuating device

[0090] 62 louver package P240951 DE

[0091] -10-

[0092] 64 friction plates

[0093] 66 Counter blade

[0094] 68 Belleville washers

[0095] 70 piston element

[0096] 72 actuating bearings

[0097] 74 Ramp mechanism

[0098] 76 Actuating gears

[0099] 78 first actuating gear

[0100] 80 second actuating gear

[0101] 82 recess

[0102] 84 shoring devices

[0103] 86 external circumference

[0104] 88 first axial projection

[0105] 90 second axial projection

[0106] 92 Opening

[0107] 94 Connecting element

[0108] 96 Passage opening

[0109] 98 mm inner bore

[0110] 100 screw elements

Claims

P240951 DE -11- Patent claims 1. Torque transmission device (10) for a vehicle drive train, comprising a housing (12) with a first housing wall (14) and an axially opposite and connected second housing wall (16) and a housing interior (18) formed axially between at least the first and second housing walls (14, 16), within the housing interior (18) at least one gear stage (28) with at least one first gear (32) rotatable about an axis of rotation (30) and thus in meshing engagement for torque transmission, wherein the first and second gear (32, 34) are mounted on the housing (12), characterized in that the first housing wall (14) is axially supported against the second housing wall (16) by means of support means (84) arranged within the housing interior (18).

2. Torque transmission device (10) according to claim 1, characterized in that the support means (84) are formed in one piece from the first and / or second housing wall (14, 16).

3. Torque transmission device (10) according to claim 1 or 2, characterized in that the support means (84) are arranged radially within the housing interior (18) between an outer circumference (86) of the housing (12) and the axis of rotation (30).

4. Torque transmission device (10) according to one of the preceding claims, characterized in that the support means (84) comprise a first axial projection (88) arranged on the first housing wall (14) and / or a second axial projection (90) arranged on the second housing wall (16).

5. Torque transmission device (10) according to claim 4, characterized in that the first axial projection (88) is integrally formed with the first P240951 DE -12- The housing wall (14) and / or the second axial projection (90) is formed in one piece with the second housing wall (16).

6. Torque transmission device (10) according to claim 4 or 5, characterized in that the first and / or second axial projection (88, 90) has a circular cross-section when viewed in the axial direction.

7. Torque transmission device (10) according to one of claims 4 to 6, characterized in that the first and / or second axial projection (88, 90) has an opening (92) for receiving a connecting element (94) for axially clamping the first and second housing wall (14, 16).

8. Torque transmission device (10) according to claim 7, characterized in that the connecting element (94) is a screw element (100).

9. Torque transmission device (10) according to one of the preceding claims, characterized in that the second gear (34) is arranged coaxially to a rotor shaft (36) that can be connected to a rotor of an electric motor.

10. Torque transmission device (10) according to one of the preceding claims, characterized in that the support means (84) are arranged circumferentially offset and / or radially overlapping with the second gear (34).

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