Torsional vibration damping device

Abstract

Torsional vibration damping device (1) with a primary mass (4) and a secondary mass (5) which is rotatable relative to the primary mass (4) against the action of at least one torsional vibration damping element (7) and by means of a bearing device (10) comprising an axial thrust washer (18), an axial friction ring (16) and a radial sliding bearing sleeve (14), wherein the axial thrust washer (18) is non-rotatably connected to the primary mass (4), wherein the axial thrust washer (18) has at least one radial projection (41-43) which is non-rotatably connected to the primary mass (4) and projects radially outwards, wherein the radial projection (41-43) engages with a drive element extending from a retaining element (25) which is attached to the primary mass (4).

Description

[0001] The invention relates to a torsional vibration damping device with a primary mass and a secondary mass, which is rotatable relative to the primary mass against the action of at least one torsional vibration damping element and with the aid of a bearing device comprising an axial thrust washer, an axial friction ring and a radial sliding bearing sleeve.

[0002] Such facilities are known, for example, from DE 100 24 088 A1, DE 33 40 896 C2, DE 197 28 422 A1 or DE 195 42 514 A1.

[0003] The object of the invention is to improve a torsional vibration damping device according to the preamble of claim 1, particularly with regard to the bearing device.

[0004] The problem is solved in a torsional vibration damping device with a primary mass and a secondary mass, which is rotatable relative to the primary mass against the action of at least one torsional vibration damping element and with the aid of a bearing assembly comprising an axial thrust washer, an axial friction ring, and a radial sliding bearing sleeve, by connecting the axial thrust washer to the primary mass in a rotationally fixed manner. This offers the advantage that the available axial friction surface can be increased. Furthermore, the formation of friction rust under the thrust washer is prevented.

[0005] A preferred embodiment of the torsional vibration damping device is characterized in that the axial friction ring is arranged between the axial thrust washer and the secondary mass. The axial friction ring is preferably made of a sliding material with a low coefficient of friction. This keeps the frictional torque low when disengaging a clutch equipped with the torsional vibration damping device.

[0006] According to the invention, the torsional vibration damping device is characterized in that the axial thrust washer has at least one radial projection which is rotationally fixed to the primary mass. The radial projection is preferably integrally connected to the thrust washer.

[0007] According to the invention, the torsional vibration damping device is characterized in that the radial projection engages with a drive element extending from a retaining element attached to the primary mass. Preferably, a friction device is held radially outside the retaining element, which is effective between the primary mass and the secondary mass in certain operating conditions.

[0008] Another preferred embodiment of the torsional vibration damping device is characterized in that the drive element comprises a drive finger which engages in a recess provided in the radial projection. The shape and dimensions of the recess are adapted to the shape and dimensions of the drive finger.

[0009] Another preferred embodiment of the torsional vibration damping device is characterized in that the drive finger extends partially in the axial direction. Preferably, the circumferential clearance of the thrust washer is kept small.

[0010] Another preferred embodiment of the torsional vibration damping device is characterized in that the drive finger extends radially at its end. The axial thrust washer is partially arranged axially between the radially extending end of the drive finger and the primary mass. This holds the thrust washer in the axial direction, particularly during assembly of the torsional vibration damping device.

[0011] Another preferred embodiment of the torsional vibration damping device is characterized in that the retaining element is attached to the primary mass by means of fasteners. The retaining element is preferably attached to the primary mass by means of rivets.

[0012] Another preferred embodiment of the torsional vibration damping device is characterized in that the radial projection has a through-hole for a rivet lug through which the thrust washer is attached to the primary mass. The rivet lugs are integrally connected to the primary mass.

[0013] Another preferred embodiment of the torsional vibration damping device is characterized in that the axial thrust disk has several, in particular two or three, radial projections that are rotationally fixed to the primary mass. The radial projections are preferably integrally connected to the thrust disk and evenly distributed around its circumference.

[0014] Further advantages, features, and details of the invention will become apparent from the following description, in which various exemplary embodiments are described in detail with reference to the drawing. The drawing shows: Fig. 1 a torsional vibration damping device according to the invention in longitudinal section; Fig. 2 an enlarged section from Fig. 1; Fig. 3. A perspective view of a section from Fig. 1 and Fig. 4 the excerpt from Fig. 3 in the top view.

[0015] In Fig. Figure 1 shows a longitudinal section of a torsional vibration damping device 1. The torsional vibration damping device 1, also referred to as a torsional vibration damper, is a dual-mass flywheel with an input part 4, also referred to as the primary mass. The primary mass 4 is rotatable about an axis of rotation 6 relative to an output part 5, also referred to as the secondary mass. Energy storage elements 7 are connected between the primary mass 4 and the secondary mass 5 in a known manner, which counteract any rotation of the two masses 4 and 5 relative to each other. The output part 5 comprises a flange element 8, which is coupled radially to the energy storage element 7 on the outside. Radially, the flange element 8 is rigidly connected to the secondary mass 5 by means of riveted fasteners 9.

[0016] The primary mass 4 can be attached to a crankshaft of an internal combustion engine of a motor vehicle. The secondary mass 5 is, for example, part of a coupling device (not shown) by which the crankshaft of the internal combustion engine can be coupled to a transmission input shaft of a transmission of a motor vehicle.

[0017] The torsional vibration damping device 1 comprises a bearing assembly 10, which is effective in the radial and axial directions between a primary hub part 11 and a secondary hub part 12. The primary hub part 11 is integrally connected to the primary mass 4. The secondary hub part 12 is integrally connected to the secondary mass 5. The bearing assembly 10 comprises a sliding bearing sleeve 14, which is arranged radially between the primary hub part 11 and the secondary hub part 12. The bearing assembly 10 further comprises an axial friction ring 16, which is arranged axially between the secondary hub part 12 and an axial thrust washer 18.

[0018] The axial thrust washer 18 has a recess 19 into which a finger 21 engages, extending from a retaining element 25. The retaining element 25 is attached to the primary mass 4. The finger 21 extends partially axially away from the primary mass 4 obliquely inwards. The free end of the finger 21 is angled and extends radially inwards. The angled end of the finger 21 partially engages the thrust washer 18. Radially on its outer side, the retaining element 25 has a recess with a friction element 28, which preferably acts between the primary mass 4 and the secondary mass 5.

[0019] In Fig. 2 is an excerpt from Fig. 1 shown enlarged with finger 21. In Fig. Figure 2 shows that a through-hole 30 is recessed in the inlet part 4, which serves to guide a screw 31 through, with the aid of which the inlet part 4 of the torsional vibration damper 1 can be fastened to the crankshaft of the internal combustion engine. Furthermore, it can be seen in Fig. 2, that the axial friction ring 16 has two radially internal chamfers 34, 35. The axial extension of the sliding bearing sleeve 14 is in Fig. 2 is labelled with a and is, for example, about 12 mm.

[0020] In the Fig. 3 and Fig. Figure 4 shows that three radial projections 41, 42, 43 extend from the axial thrust washer 18, into each of which a finger 21, 22, 23 engages, extending from the retaining element 25. The fingers 21 to 23 and the associated radial projections 41 to 43 are arranged evenly distributed around the circumference of the retaining element 25 and the axial thrust washer 18, respectively. Fig. Figure 3 shows that the sliding bearing sleeve 14 and the axial friction ring 16 can be pre-assembled on the input part 4. The pre-assembled unit can then be placed on a horizontal output part (5 in the Fig. 1 and Fig. 2) be installed without the thrust washer 18 coming loose or falling off. Furthermore, it can be seen in Fig. 3, that the retaining element 25 is attached to the inlet part 4 by means of fastening elements 45 to 47. The fastening elements 45 to 47 are, for example, rivet elements. Reference symbol list 1 Torsional vibration damping device 4 Entrance section 5 Initial part 6 axis of rotation 7 Energy storage element 8 Flange element 9 Rivet connection element 10 Storage equipment 11 Primary hub part 12 Secondary hub part 14 Sliding bearing sleeve 16 axial friction ring 18 axial thrust washer 19 Exclusion 21 fingers 22 fingers 23 fingers 25 retaining element 28 Friction device 30 through hole a axial extension 31 screw 34th phase 41 radial approach 42 radial approach 43 radial approach 45 Fastening element 46 Fastening element 47 Fastening element

Claims

[1] Torsional vibration damping device (1) with a primary mass (4) and a secondary mass (5) which is rotatable relative to the primary mass (4) against the action of at least one torsional vibration damping element (7) and by means of a bearing device (10) comprising an axial thrust washer (18), an axial friction ring (16) and a radial sliding bearing sleeve (14), wherein the axial thrust washer (18) is non-rotatably connected to the primary mass (4), wherein the axial thrust washer (18) has at least one radial projection (41-43) which is non-rotatably connected to the primary mass (4) and projects radially outwards, wherein the radial projection (41-43) engages with a drive element extending from a retaining element (25) which is attached to the primary mass (4). [2] Torsional vibration damping device (1) with a primary mass (4) and a secondary mass (5) which is rotatable relative to the primary mass (4) against the action of at least one torsional vibration damping element (7) and by means of a bearing device (10) comprising an axial thrust washer (18), an axial friction ring (16) and a radial sliding bearing sleeve (14), wherein the axial thrust washer (18) is non-rotatably connected to the primary mass (4), wherein the axial thrust washer (18) bears directly against the axial friction ring (16), the axial friction ring (16) bears directly against the sliding bearing sleeve (14), and the axial thrust washer (18), the axial friction ring (16) and the sliding sleeve (14) are arranged one behind the other in the axial direction. [3] Torsional vibration damping device according to claim 1 or 2, characterized by , that the axial friction ring (16) is arranged between the axial thrust washer (18) and the secondary mass (5). [4] Torsional vibration damping device according to claim 1, 2 or 3, characterized by , that the drive element comprises a drive finger (21-23) which engages in a recess provided in the radial projection (41-43). [5] Torsional vibration damping device according to claim 4, characterized by , that the drive finger (21-23) extends partially in the axial direction. [6] Torsional vibration damping device according to claim 5, characterized by , that the drive finger (21-23) extends radially at the end. [7] Torsional vibration damping device according to any one of claims 1 to 6, characterized by , that the retaining element (25) is attached to the primary mass (4) by means of fastening elements (45-47). [8] Torsional vibration damping device according to claim 1 or 2, characterized by, that the radial projection (41-43) has a through hole for a rivet lug through which the axial thrust washer (18) is attached to the primary mass (4). [9] Torsional vibration damping device according to any one of claims 1 to 8, characterized by , that the axial thrust washer (18) has several, in particular two or three, radial projections (41-43) which are non-rotatably connected to the primary mass (4).

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