Slat for a connecting device of a motor vehicle and connecting device for a motor vehicle

Abstract

The invention relates to a lamella (1) for a connecting device (20) of a motor vehicle, comprising: - a friction section (2) for frictionally establishing a connection to at least one further lamella (24) of the connecting device (20), - a connecting section (3) for positive connection to a second plate carrier (23) of the connecting device (20), - wherein the connecting section (3) has a corrugated shape in the circumferential direction (U) compared to the friction section (2). Furthermore, the invention relates to a connecting device (20) for a motor vehicle and for releasing and connecting a power transmission with at least one plate (1).

Description

[0001] The invention relates to a lamella for a connecting device of a motor vehicle and a connecting device for a motor vehicle and for releasing and connecting a power transmission.

[0002] It is well known that low drag torques are required for connecting devices such as multi-disk brakes used as vehicle and / or wheel brakes due to the high efficiency requirements of vehicle drives (e.g. particularly in battery electric vehicles (BEVs).

[0003] In this case, a lamella 1 (cf. Fig. 1) is known, which has a friction section 2 and a connecting section 3 with profile 4.

[0004] For example, there are various design options available for separating the plates of a multi-plate clutch. One of these design options could be, for example, corrugation of the friction section 2 of a plate 1, such as a lining plate.

[0005] In this case, for example, disc 1, which can be arranged on a first disc carrier, can be more easily released from another disc, which can be arranged on a second disc carrier, when a contact force from an actuating element (such as a central release mechanism - not shown) is no longer applied. This means that friction can be reduced to a minimum when a multi-disk brake, for example, is not in use.

[0006] However, due to the high torques in BEVs compared to clutch applications in combustion engine vehicles, it is necessary to use more plates, whose diameter and friction surface are larger than those in combustion engine vehicles. This, however, has a negative impact on the drag torque of, for example, a multi-disk brake.

[0007] Furthermore, the aforementioned corrugation can also increase the gap between two adjacent plates. At this point, the cooling oil flowing radially through the connecting device, such as a clutch pack, can adhere to both one plate, such as a facing plate, and another plate, such as a steel plate, due to adhesion forces. The cohesive forces within the oil then create drag torques due to the rotational movement between the plates (e.g., steel and facing plates).

[0008] Against this background, it is therefore an object of the present invention to provide a plate for a connecting device of a motor vehicle and a connecting device for a motor vehicle and for connecting and disconnecting a power transmission, which ensures a low drag torque compared to known solutions and / or can be produced cost-effectively and / or with material savings.

[0009] This problem is solved by the features of the independent patent claims. Further advantageous developments are the subject of the dependent claims.

[0010] A first aspect of the present invention comprises a plate for a connecting device of a motor vehicle. A connecting device can be, for example, a multi-disk clutch or a multi-disk brake. A motor vehicle in the present context can be, for example, an electrically powered motor vehicle, an electric motor vehicle, and / or a battery-electric vehicle (BEV).

[0011] The connecting device has a friction section for frictionally establishing a connection to at least one further lamella of the connecting device.

[0012] Furthermore, the connecting device has a connecting section for positive connection to a second plate carrier of the connecting device.

[0013] The friction section is arranged further outward in the radial direction than the connecting section. Furthermore, the friction section and the connecting section are connected to each other and arranged around a common axis of rotation that is aligned in the axial direction. The friction section and the connecting section can also be formed from one part, one-piece, or integrally.

[0014] Furthermore, the connecting section has a corrugated shape in the circumferential direction compared to the friction section. Only the connecting section can also have a corrugated shape. This makes it possible to design the connecting device with a lower drag torque compared to known connecting devices. Furthermore, this also enables cost-effective and / or material-saving production compared to the prior art.

[0015] Furthermore, the connecting section can have alternating peaks and valleys in the circumferential direction, e.g., relative to the axial direction, about which the lamella can be rotatably mounted.

[0016] The connecting section can be designed similarly to a corrugated spring washer. The connecting section can also be designed similarly to a corrugated spring washer according to DIN 137 Form B.

[0017] In addition, the connecting section may have a profile tolerance, such as a profile tolerance of any surface. The toleranced surface may be between two parallel surfaces enclosing spheres with a diameter of 0.1 mm, 0.05 mm, or less than 0.05 mm.

[0018] In addition, the connecting section can have a profile form tolerance, such as a profile form tolerance of any line. In this case, the toleranced profile can lie in any section to the drawing plane between two lines enclosing circles with a diameter of 0.1 mm, 0.05 mm, or less than 0.05 mm.

[0019] The smaller the diameter, the lower the drag torque that can be achieved.

[0020] Furthermore, the connecting section can have a profile for a positive connection with a second plate carrier of the connecting device. The profile serves for a rotationally fixed and axially displaceable connection with, for example, a plate carrier.

[0021] Furthermore, the corrugated shape of the connecting section can have maxima and / or minima in the circumferential direction, which can each have a maximum or minimum distance in the axial direction from an imaginary plane, which can be oriented perpendicular to the axis of rotation and / or to the axial direction.

[0022] The imaginary plane can be positioned centrally in the axial direction between the maxima and / or minima. Thus, with respect to the imaginary plane, maxima and / or minima can be opposite each other and / or equidistant from the imaginary plane.

[0023] Furthermore, it is conceivable for the connecting section to have at least one friction point. The at least one friction point can have a friction lining. A definable friction coefficient can be set using a friction lining.

[0024] Furthermore, the corrugated shape of the connecting portion can form the at least one friction point.

[0025] In addition, the at least one friction point can be arranged and / or attached at the maximum and / or minimum points of the corrugated shape of the connecting section. The at least one friction point can also be arranged and / or attached only at the maximum and / or minimum points of the corrugated shape of the connecting section. This ensures that the friction points are the first to come into contact with other lamellae, for example.

[0026] Furthermore, the friction portion and the connecting portion can be connected to each other at points along the circumferential direction. Thus, the connecting portion can be easily formed into a corrugated shape without deformation of the friction portion.

[0027] Furthermore, the friction section and the connecting section can be connected to each other in the radial direction via webs. The webs can be evenly distributed in the circumferential direction. Furthermore, a cutout or recess can be arranged between two webs. This design allows the connecting section to be easily formed into a corrugated shape without deforming the friction section. The cutout or recess can be arcuate.

[0028] It is also possible for the friction section to have a flatness tolerance and / or a runout tolerance and / or a total runout tolerance. With the runout tolerance, the runout deviation at any measuring point during rotation around the axis or around the axial direction cannot be greater than 0.15, 0.1, or 0.08 mm. Furthermore, with the total runout tolerance or the total radial runout tolerance, all points on the surface of the friction section can be within the total runout tolerance or the total radial runout tolerance of t = 0.1 or 0.08 mm.

[0029] The smaller the tolerance, the lower the drag torque that can be achieved.

[0030] Furthermore, the friction section can have a planar, flat, or flat shape compared to the connecting section. In other words, the friction section can be designed without a corrugated shape. The friction section can be spaced from the imaginary plane or partially form it.

[0031] The friction section can also have a friction lining. A friction lining can be used to set a definable friction coefficient. This can be determined by the composition of the friction lining.

[0032] In addition, the lamella and / or the friction section and / or the connecting section can be designed in the shape of a circular disk. Thus, the lamella and / or the friction section and / or the connecting section can be designed similarly to a washer.

[0033] A second aspect of the present invention includes a connecting device for a motor vehicle and for connecting and disconnecting a power transmission.

[0034] It is expressly pointed out that the features of the slat, as mentioned under the first aspect, can be used individually or in combination with one another in the connecting device.

[0035] In other words, the features relating to the lamella mentioned above under the first aspect of the invention can also be combined with further features here under the second aspect of the invention.

[0036] A connecting device for a motor vehicle and for connecting and disconnecting a power transmission can be designed, for example, as a multi-disk brake or a multi-disk clutch. Both configurations allow for the connection and disconnection of a power transmission. In the present context, a motor vehicle can be, for example, an electrically powered motor vehicle, an electric motor vehicle, and / or a battery-electric vehicle (BEV).

[0037] The connecting device comprises a first slat carrier with an axial stop for limiting the movement of slats in the axial direction.

[0038] Furthermore, the connecting device has a second lamella carrier.

[0039] In addition, the connecting device comprises at least one lamella according to the first aspect, which is arranged on the second lamella carrier in a rotationally fixed and axially displaceable manner.

[0040] Furthermore, the connecting device can have at least one further lamella which is arranged on the first lamella carrier in a rotationally fixed and axially displaceable manner.

[0041] In this case, the at least one further plate can be designed as a steel plate, e.g. without a friction lining.

[0042] Furthermore, at least one separating element can be arranged between two additional plates, allowing the additional plates to be spaced apart from one another. This can be the case, for example, if no force is exerted by a central release mechanism in the direction of the axial stop, thus preventing a plate pack consisting of plates and additional plates from being compressed.

[0043] The at least one separating element and the corrugated shape of the connecting section can be coordinated with one another such that the connecting section and the at least one separating element position the at least one slat centrally between two further slats.

[0044] The at least one separating element can, for example, be a return spring on an actuating element (such as a central release mechanism). This allows the actuating element (e.g., configured as a hydraulic or electromechanical actuating system, such as a central release mechanism) to be returned to its initial position. This ensures that the connecting device, e.g., configured as a multi-plate clutch, can be fully opened.

[0045] The at least one separation element can, for example, also be a separation spring between the other slats. This allows the other slats to be actively separated when there is no contact force from, for example, an actuating element. If one or more separation springs are particularly strong, springs for resetting an actuating system can be omitted.

[0046] Furthermore, the at least one lamella and the at least one further lamella can be arranged alternately in the axial direction.

[0047] In the following, the inventive concept presented above is expressed again and additionally in other words.

[0048] This idea concerns—in simplified terms—a plate for a connecting device in a motor vehicle. A friction section of the plate may not have corrugation, but only a connecting section of the plate below it may have corrugation over a smaller diameter area.

[0049] This avoids a reduction in the air gap for the radially flowing cooling oil in the area of the friction section. Nevertheless, the separation of the friction section can be ensured by the remaining area or by the connecting section with corrugation.

[0050] As already mentioned, the slat can be divided into two areas or sections.

[0051] In the outer area, or in the friction section where a friction surface may be located, the plate may not have any corrugation to prevent the distance to a further plate, such as a steel plate, from being locally reduced. This can reduce the adhesion of cooling oil between the plate and the further plate over a large area, thus reducing the drag torque.

[0052] In the inner region or in the connecting section, which can be separated from the outer region by arcuate slots, the lamella can be corrugated or have a corrugated shape in order to ensure detachment from another lamella, e.g. when opening a lamella pack of a connecting device.

[0053] The height of the corrugation can be selected so that the plate can be positioned as centrally as possible between two other plates. To minimize the adhesion of cooling oil, this area can only have a friction lining on the crests of the corrugation, as contact with the other plate can occur here under differential speed.

[0054] Since the average friction radius of the connecting section is smaller and the friction surface is reduced compared to the non-corrugated area or compared to the friction section and therefore less cooling oil can adhere, this measure has a positive effect on the drag torque.

[0055] The invention is explained in more detail below using an exemplary embodiment in conjunction with the accompanying drawings. The drawings schematically show: Fig. 1 a plan view and a side view of a lamella for a connecting device of a motor vehicle from the prior art; Fig. 2 a plan view and a side view of a lamella for a connecting device of a motor vehicle; and Fig. 3 a sectional view of a connecting device for a motor vehicle and for releasing and connecting a power transmission.

[0056] In the following description, the same reference symbols are used for the same items.

[0057] Fig. 1 shows a plan view and a side view of a lamella 1 for a connecting device of a motor vehicle from the prior art.

[0058] Due to the fact that the figure in question is already explained at the beginning of the description, further details will be omitted at this point.

[0059] Fig. 2 shows a top view and a side view of a slat 1 for a connecting device 20 of a motor vehicle.

[0060] Shown in more detail Fig. 2, that a plate 1 for a connecting device 20 of a motor vehicle comprises a friction section 2 for frictionally establishing a connection to at least one further plate 24 of the connecting device 20 and a connecting section 3 for positively connecting to a second plate carrier 23 of the connecting device 20.

[0061] The friction section 2 is arranged further outwards in the radial direction R compared to the connecting section 3.

[0062] In addition, the friction section 2 and the connecting section 3 are connected to each other and arranged around a common axis of rotation which is aligned in the axial direction A.

[0063] Compared to the friction section 2, the connecting section 3 has a corrugated shape in the circumferential direction U – see the side view (right). The corrugated shape or corrugation is exaggerated for simplicity and clarity.

[0064] How Fig. As can be seen from Figure 2, only the connecting section 3 has a corrugated shape. Furthermore, the connecting section 3 has alternating peaks and valleys, or maxima M and / or minima M, in the circumferential direction U, e.g., relative to the axial direction A, about which the lamella 1 can be rotatably mounted.

[0065] In other words, the connecting section 3 can be designed similarly to a corrugated spring washer, wherein the connecting section 3 can be designed similarly to a corrugated spring washer according to DIN 137 Form B.

[0066] The connecting section 3 has a profile 4 for positive connection with a second slat carrier 23 of the connecting device 20.

[0067] As already indicated, the corrugated shape of the connecting section 3 has maxima M in the circumferential direction U, which each have a maximum distance in the axial direction A from an imaginary plane E which is oriented perpendicular to the axis of rotation or to the axial direction A.

[0068] The imaginary plane E is arranged centrally in the axial direction A between the maxima M.

[0069] In addition, Fig. 2, that the connecting section 3 has friction points 5, 6, each friction point 5, 6 having a friction lining. Thus, the corrugated shape of the connecting section 3 forms the friction points 5, 6, with a friction point 5, 6 being arranged or attached to each of the maxima M of the corrugated shape of the connecting section 3.

[0070] Furthermore, Fig. 2, that the friction section 2 and the connecting section 3 are connected to each other in places along the circumferential direction U.

[0071] In the radial direction R, the friction section 2 and the connecting section 3 are connected to each other via webs 7, wherein the webs 7 are evenly distributed in the circumferential direction U. Between each two webs 7, a recess 8 or a cutout 8 is arranged. The recess 8 or the cutout 8 is arcuate.

[0072] In addition, the friction section 2 has a flatness tolerance and / or a runout tolerance and / or a total runout tolerance. In other words, the friction section 2 has a flat shape compared to the connecting section 3. In other words, the friction section 2 is designed without a corrugated shape. However, the friction section 2 has a friction lining. The friction lining pattern is shown in Fig. 2 shown in simplified form.

[0073] According to Fig. 2, the friction section 2 can be spaced from the imaginary plane E or can partially form it.

[0074] Fig. 3 shows a sectional view of a connecting device 20 for a motor vehicle and for releasing and connecting a power transmission.

[0075] The connecting device 20 has a first disk carrier 21 with an axial stop 22 for limiting the movement of disks in the axial direction A and a second disk carrier 23.

[0076] Furthermore, Fig. 3, that the connecting device 20 comprises several slats 1, as shown in Fig. 2. The slats 1 are arranged on the second slat carrier 23 in a rotationally fixed and axially displaceable manner.

[0077] In addition, the connecting device 20 according to Fig. 3 several additional plates 24, which are arranged on the first plate carrier 21 in a rotationally fixed and axially displaceable manner. The additional plates 24 are designed as steel plates without friction lining.

[0078] A separating element (not shown) is arranged between each two additional plates 24, allowing the additional plates 24 to be spaced apart from one another. This applies, for example, when no force acts from a central release mechanism in the direction of the axial stop 22, meaning that the plate pack consisting of plates 1 and additional plates 24 is not compressed.

[0079] Here, the separating elements and the corrugated shape of the connecting sections 3 of the slats 1 are coordinated with one another in such a way that each connecting section 3 and each separating element positions the respective slat 1 centrally between two further slats 24.

[0080] In addition, Fig.3 shows that the slats 1 and the further slats 24 are arranged alternately in the axial direction A. List of reference symbols 1 slat 2 friction section 3 connecting section 4 Profile 5 Friction point 6 friction point 7 jetty 8 Recess / cutout 20 connecting device 21 first slat carrier 22 Axial stop 23 second slat carrier 24 additional slats E imaginary plane M Maximum / Minimum R radial direction A axial direction U circumferential direction

Claims

[1] Slat (1) for a connecting device (20) of a motor vehicle, comprising: - a friction section (2) for frictionally establishing a connection to at least one further lamella (24) of the connecting device (20), - a connecting section (3) for positive connection to a second plate carrier (23) of the connecting device (20), - wherein the friction section (2) is arranged further outwards in the radial direction (R) compared to the connecting section (3), and - wherein the friction section (2) and the connecting section (3) are connected to each other and are arranged around a common axis of rotation which is aligned in the axial direction (A), characterized by that the connecting section (3) has a corrugated shape in the circumferential direction (U) compared to the friction section (2). [2] Slat according to claim 1, - wherein the connecting section (3) has alternating peaks and valleys in the circumferential direction (U), and / or - wherein the connecting portion (3) is designed similar to a corrugated spring washer. [3] Slat according to claim 1 or 2, - wherein the corrugated shape of the connecting section (3) in the circumferential direction (U) has maxima (M) and / or minima (M), which each have a maximum or minimum distance in the axial direction (A) from an imaginary plane (E) which is oriented perpendicular to the axis of rotation and / or to the axial direction (A). [4] Slat according to one of the preceding claims, - wherein the connecting section (3) has at least one friction point (5, 6), - wherein the corrugated shape of the connecting section (3) forms the at least one friction point (5, 6), and / or - wherein the at least one friction point (5, 6) is arranged and / or attached to the maxima (M) and / or the minima (M) of the corrugated shape of the connecting section (3). [5] Slat according to one of the preceding claims, - wherein in the radial direction (R) the friction section (2) and the connecting section (3) are connected to one another via webs (7), and - wherein a recess (8) or a cutout (8) is arranged between two webs (7). [6] Slat according to one of the preceding claims, - wherein the connecting section (3) has a profile (4) for positive connection to a second slat carrier (23) of the connecting device (20). [7] Slat according to one of the preceding claims, - wherein the friction section (2) has a planar shape compared to the connecting section (3), and / or - wherein the friction section (2) has a friction lining. [8] Connecting device (20) for a motor vehicle and for disconnecting and connecting a power transmission, comprising: - a first plate carrier (21) with an axial stop (22) for limiting the movement of plates in the axial direction (A), - a second slat carrier (23), and - at least one lamella (1) according to one of the preceding claims, which is arranged on the second lamella carrier (23) in a rotationally fixed and axially displaceable manner. [9] Connecting device according to claim 8, - wherein the connecting device (20) has at least one further lamella (24) which is arranged on the first lamella carrier (21) in a rotationally fixed and axially displaceable manner, and - wherein the at least one lamella (1) and the at least one further lamella (24) are arranged alternately in the axial direction (A). [10] Connecting device according to claim 8 or 9, - wherein at least one separating element is arranged between two further slats (24) so that the further slats (24) can be spaced apart from one another, and / or - wherein the at least one separating element and the corrugated shape of the connecting section (3) are coordinated with one another such that the connecting section (3) and the at least one separating element position the at least one slat (1) centrally between two further slats (24).

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