DE102021122691A1 - Torsional vibration damper and method for its manufacture - Google Patents

Abstract

The invention relates to a torsional vibration damper (201) and a method for its manufacture, having an input part which is arranged such that it can be rotated about an axis of rotation and an output part which can be rotated counter to this in a limited manner about the axis of rotation against the action of spring units (206) which are distributed over the circumference and are effective in the circumferential direction. wherein the spring units (206) are prestressed at their end faces (214, 215) between first stops (211) on the input side of a disk part (203) of the input part and a cover part (204) which is tightly connected to the disk part (203) and has the first stops (211 ) opposite second stops (212) are added. In order to simplify the assembly of the cover part (204) on the disc part (203), a circumference (U2) between the end faces (215) of the spring units (206) that are adjacent in the circumferential direction on the end faces (215) facing the second stops (212) set larger than a circumference (U1) of the stops (212) of the cover part (204).

Description

The invention relates to a torsional vibration damper and a method for its manufacture, having an input part which is arranged such that it can be rotated about an axis of rotation and an output part which can be rotated counter to this in a limited manner about the axis of rotation against the action of spring units which are distributed over the circumference and are effective in the circumferential direction, with the spring units on their end faces prestressed between the input-side first stops of a disk part of the input part and a cover part tightly connected to the disk part with second stops axially opposite the first stops. Generic torsional vibration dampers are, for example, from the publications DE 10 2020 100 191 A1 and DE 10 2019 131 016 A1 known. Such torsional vibration dampers contain an input part which is arranged such that it can be rotated about an axis of rotation and which contains at least one disc part and a cover part which are connected to one another radially on the outside and form an annular chamber in which a spring device with spring units, for example arc springs, distributed over the circumference are accommodated. Contrary to the action of the spring device, an output part is provided which can be rotated about the axis of rotation to a limited extent relative to the input part, with the spring units being acted upon on their peripheral end faces by stops on the input side arranged on the disk part and on the cover part and flange wings of a flange part on the output side as soon as the input part and the output part are against one another be twisted.

The manufacture and assembly of such a torsional vibration damper is carried out by inserting arc springs into the lying disk part between the stops on the input side of the disk part. The flange part is then inserted with the flange wings positioned between the end faces. If necessary, lubricant is added to lubricate the spring device and if necessary further components such as friction disks and/or the like are inserted. Thereafter, the stops of the cover part are introduced into the gaps between the end faces and the disc part and the cover part are radially connected to one another, for example welded.

In particular in the case of spring units which are introduced in a prestressed manner between the stops, a one-sided prestress can occur on these, which narrows the gaps for the stops, so that the assembly of the cover part is made more difficult.

The object of the invention is the further development of a generic torsional vibration damper. In particular, the object of the invention is to propose a torsional vibration damper that can be produced safely and without assembly that may be difficult.

The object is solved by the subject matter of claims 1 and 10. The claims dependent on claim 1 present advantageous embodiments of the subject-matter of claim 1.

The proposed torsional vibration damper is used for torsional vibration isolation of torsional vibrations in a drive train, in particular a hybrid drive train with an internal combustion engine subject to torsional vibrations. For this purpose, the torsional vibration damper is connected to the crankshaft of the internal combustion engine by means of its input part. The input part can be made of sheet metal, for example a disk part and a cover part connected thereto, for example welded. Depending on the design of the input part, this can form a primary flywheel mass as part of a dual-mass flywheel. One or more additional mass rings, a starter ring gear and/or sensor markings, for example a sensor ring, can be accommodated or worked on the input part, for example on an axial extension of the disk part and/or the cover part.

Opposite the input part, which is rotatable about an axis of rotation, there is a limited output part that is rotatable about the axis of rotation and counteracts the action of spring units that are distributed over the circumference and are effective in the circumferential direction. The output part forms the output of the torsional vibration damper and for this purpose can contain an output hub which can be connected in a rotationally locked manner to a shaft or a counter-pressure plate for forming a friction clutch in connection with a clutch pressure plate. A counter-pressure plate can form the essential part of the secondary flywheel mass. Alternatively, in a torsional vibration damper with an output hub, at least part of the secondary flywheel mass can be provided in a drive train device downstream of the output hub, such as a double clutch, a rotor of an electric machine, a housing of a torque converter or the like.

The output part can also contain a centrifugal pendulum and/or a slipping clutch.

Preferably, the spring units distributed over the circumference are prestressed at their end faces between the first stops on the input side of the disk part of the input part and the cover part with the first Stops received axially opposite second stops. The stops act on the spring units on the input side in the circumferential direction. The pressure on the output side is assumed by flange wings of a flange part of the output part, which are expanded radially between the end faces and are each arranged axially between the first and second stops.

The proposed torsional vibration damper is assembled by fixing the cover part on the cover part and connecting it, for example by welding, with spring units pretensioned between the first stops and flange wings of the flange part inserted and, if necessary, other components such as friction rings, axial pretensioning springs of the friction rings, lubricants and/or the like. In this case, the second stops must be introduced on the same circumference of the first stops between the end faces of the spring units that are adjacent in the circumferential direction. In order to avoid jamming and blockages of the second stops during insertion between the end faces due to the spring units prestressed on one side between the first stops, a circumference between the end faces of the spring units that are adjacent in the circumferential direction in the area of the second stops is set larger than a circumference of the second stops of the cover part. This means that the smaller available scope caused by the one-sided prestressing of the spring units by means of the first stops is expanded to such an extent that the second stops can be introduced into a gap between the end faces adjacent in the circumferential direction without blocking.

For example, setting angles greater than 3°, preferably greater than 10°, can be set between the end faces and the contact faces of the stops relative to a parallel to the axis of rotation, that is essentially to a perpendicular to the circumferential direction. For example, the stops as embossings, which due to their production already have an embossing angle of up to 3° that forms or contributes to this angle, which is usually not sufficient to compensate for the inclined position of prestressed spring units. Provision can therefore be made for the embossing to be provided with a higher setting angle, for example off-tool during production of the disk part and/or the cover part.

Alternatively or additionally, the angles of attack can be provided on the end faces of the spring units. For example, the contact surfaces of the stops can be designed essentially axially and the angle of attack can be adjusted by means of the end faces. This means that, in deviation from a planar end face, sides of the end faces that slope downwards in the circumferential direction opposite the contact surfaces of the stops are provided on one or both sides, so that the gaps between these sides are widened in the circumferential direction at least compared to the contact surfaces of the second stops, so that the second stops can be introduced in a non-difficult way between the end faces. In addition, due to the profile of the end faces, which increases when the stops are introduced axially, the required prestressing of the second stops relative to the spring units is gradually formed.

The spring units each contain an arc spring or spring assemblies made up of several nested arc springs. The arc springs each contain end faces on both sides which can coincide with the end faces of the spring units containing the angles of attack. For example, the end faces forming or containing the angle of attack can be arranged directly on the end faces of the arc springs. For example, the end faces can be ground in a roof shape on the end faces of the arc springs.

Alternatively, the spring inserts that form the angles of attack relative to the contact surfaces can be accommodated on the end faces of the arc springs. Such spring inserts, so-called spring cups, are provided with axially widened pins which engage in an interior space of the windings and are thus fastened in the arc spring. Due to the stabilization of the coils along their central axis, tilting of at least the end coils of the arc spring under one-sided prestressing at the first stops can be reduced to such an extent that the gaps required for the second stops are retained during assembly of the cover part. In addition, the spring inserts can have roof-shaped end faces to form an angle of attack, each with a contact surface of the disc part and the cover part. The spring inserts are preferably made of metal, for example by cutting, sintering or formed, for example, from rod material. The proposed method is used for the manufacture or assembly of the proposed and described torsional vibration damper, the spring units being preloaded in the circumferential direction and introduced between the first stops in the disc part. The complete or partially riveted output part is then inserted, with radially expanded flange wings of the output-side flange part being inserted between end faces of the spring units spaced apart in the circumferential direction by means of the stops. conn ßend the second stops of the cover part are introduced between these end faces and the cover part is tightly connected to the disk part radially on the outside, for example welded circumferentially.

• 1 eine Teilabwicklung eines Drehschwingungsdämpfers im Bereich zweier Federeinheiten vor der Fertigstellung nach dem Stand der Technik,
• 2 eine Teilabwicklung des vorgeschlagenen Drehschwingungsdämpfers im Bereich zweier Federeinheiten vor der Fertigstellung,
• 3 eine Teilabwicklung des Drehschwingungsdämpfers der 2 nach der Montage des Deckelteils.
• 4 eine Teilabwicklung eines gegenüber dem Drehschwingungsdämpfer der 2 und 3 abgeänderten Drehschwingungsdämpfers im Bereich zweier Federeinheiten vor der Fertigstellung,
• 5 eine Teilabwicklung des Drehschwingungsdämpfers der 4 nach der Montage des Deckelteils und
• 6 eine 3D-Darstellung eines Federeinsatzes der 4 und 5.

The invention is based on the 1 until 6 illustrated embodiments explained in more detail. These show:

• 1 a partial development of a torsional vibration damper in the area of two spring units before completion according to the prior art,
• 2 a partial development of the proposed torsional vibration damper in the area of two spring units before completion,
• 3 a partial development of the torsional vibration damper 2 after assembling the cover part.
• 4 a partial development of a compared to the torsional vibration damper 2 and 3 modified torsional vibration damper in the area of two spring units before completion,
• 5 a partial development of the torsional vibration damper 4 after assembling the cover part and
• 6 a 3D representation of a spring insert 4 and 5 .

The 1 shows a sectional partial development of the torsional vibration damper 101 according to the prior art before the assembly of the cover part 104. The input part 102 contains the disk part 103, which can be fastened to a crankshaft of an internal combustion engine by means of fastening screws. The disk part 103 forms with the cover part 104 the annular chamber 105 in which the spring units 106 are distributed over the circumference. The spring units 106 contain the arc springs 107 which, when the torsional vibration damper 101 is fully assembled, are acted upon on the input side at their end faces 108 by the contact surfaces 109, 110 of the stops 111, 112, which are designed here for example as embossings, in the circumferential direction.

The torsional vibration damper 101 is assembled by introducing the spring units 106 under prestress between the first stops 111 of the disc part 103 . As a result, the end coils 113 with the end faces 108 of the spring units 106 are loaded on one side in the area of the contact surfaces 109, so that they incline and in the area of the second stops 112 of the cover part 104 overlap the contact surfaces 109, 110 and strike the second stops 112. This makes it more difficult or even impossible to introduce the second stops 112 between the end faces 108 .

The 2 and 3 show in synopsis partial developments of compared to the torsional vibration damper 100 of 1 torsional vibration damper 201 in an unfinished state ( 2 ) and with the cover part 204 mounted ( 3 ).

The disk part 203 receives the end faces 208 of the spring units 206 embodied as arc springs 207 in a prestressed manner on the stops 211 embodied as embossing. The end faces 214, 215 of the end faces 208 of the arc springs 207 have an angle of incidence α, β to the contact faces 209, 210, i.e. the end faces have bevels radially on the outside in the area of the contact faces 209, 210, so that the angle between the contact faces 210 a stop 212 formed circumference U1 is smaller than the circumference U2 between the end faces 215, or the circumference U2 is larger than the circumference U1. In this way, the stops 212 of the cover part 204 can be introduced between the end faces 208 without any problems, even when the spring units 206 are pretensioned. When the cover part 204 is axially displaced during the assembly of the cover part 204, the edges of the stops 212 slide in the direction of the arrow 216 along the end faces 215 and prestress the spring units 206 in the assembled end position of the cover part 204 in accordance with the prestress on the stops 211.

Before the cover part 204 is installed, the flange part 217 of the output part with its radially expanded flange wings 218 is placed in contact or—as shown—with circumferential play with the end faces 208 of the spring units 206 . The flange wings 218 are positioned axially between the stops 211, 212 in order to act on the spring units 206 on the output side and dip between them when the spring units 206 are compressed.

The 4 and 5 show in synopsis partial developments of compared to the torsional vibration damper 201 of 2 and 3 modified torsional vibration damper 301 with cover part 304 not yet joined ( 4 ) and joined cover part 304 ( 5 ).

In contrast to the torsional vibration damper 201, in the torsional vibration damper 301 the end faces 308 of the disc part 303 are held prestressed at the stops 311 thereof menen arc springs 307 of the spring units 306 and the contact surfaces 309, 310 of the stops 311, 312 coming into contact end faces 314, 315 apart. For this purpose, the spring inserts 319 are attached to the spring units 306 and fastened in the interior of the arc springs 307 by means of the pins 320 . The end faces 314, 315 of the spring inserts 319 are arranged in the shape of a roof relative to one another and each form the angle α, β to the contact surfaces 309, 310 of the stops 311, 312. In the area of the flange wings 318, the spring inserts 319 preferably have the flat contact surface 321.

During assembly of the cover part 304, the stops 312 are pushed between the chamfered end faces 315 of the spring inserts 319, which are spaced apart in the circumferential direction by a greater distance than the circumference of the stops 312, and the edges of the stops 312 slide, forming the same prestressing of the spring units 306 as the prestressing by means of the edges of the stops 311 to their final position.

The 6 shows with reference to the 4 and 5 one of the spring inserts 319 in 3D view. The spring insert 319 is introduced into the interior of the arc spring 307 by means of its pin 320 on the end face 308 of the associated arc spring 307 and rests against the end face 308 of the arc spring 307 at its stop face 322 . The annular bead 323 engages between two coils of the arc spring 307 . The area of the spring insert 319 that is essentially identical in terms of its cross section to the cross section of the arc spring 307 has two end faces 314, 315 arranged in a roof shape with respect to one another, which together with the contact faces 309, 310 form the input-side loading of the spring units 306. Between the end faces 314, 315, the spring insert 319 forms the flattened contact surface 321, on which the associated flange wing 318 of the output part of the torsional vibration damper 301 acts on the spring units 306 on the output side.

Reference List

101

torsional vibration damper

102

input part

103

disc part

104

cover part

105

ring chamber

106

spring unit

107

arc spring

108

face

109

contact surface

110

contact surface

111

attack

112

attack

113

end turn

201

torsional vibration damper

203

disc part

204

cover part

206

spring unit

207

arc spring

208

face

209

contact surface

210

contact surface

211

attack

212

attack

214

face

215

face

216

Arrow

217

flange part

218

flange wing

301

torsional vibration damper

303

disk part

304

cover part

306

spring unit

307

arc spring

308

face

309

contact surface

310

contact surface

311

attack

312

attack

314

face

315

face

318

flange wing

319

spring insert

320

cones

321

contact surface

322

stop surface

323

ring bead

U1

Scope

U2

Scope

a

angle of attack

β

angle of attack

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102020100191 A1 [0001]
• DE 102019131016 A1 [0001]

Claims (10)

Torsional vibration damper (201, 301) with an input part which is arranged such that it can be rotated about an axis of rotation and an output part which can be rotated counter to this in a limited manner about the axis of rotation against the action of spring units (206, 306) which are distributed over the circumference and are effective in the circumferential direction, the spring units (206, 306) prestressed at their end faces (214, 215, 314, 315) between the first stops (211, 311) on the inlet side of a disc part (203, 303) of the inlet part and a cover part (204, 304) tightly connected to the disc part (203, 303). ) with second stops (212, 312) axially opposite the first stops (211, 311), characterized in that a circumference (U2) between the end faces (215, 315) of the spring units (206, 306) that are adjacent in the circumferential direction the sides of the end faces (215, 315) facing the second stops (212, 312) is set larger than a circumference (U1) of the second stops (212, 312) of the De cover part (204, 304). Torsional vibration dampers (201, 301). claim 1 , characterized in that between the end faces (214, 215, 314, 315) and the contact faces (209, 210, 309, 310) of the stops (211, 212, 311, 312) the setting angle (α, β) is greater than 3°, are preferably set to be greater than 10°. Torsional vibration dampers (201, 301). claim 1 or 2 , characterized in that the contact surfaces (209, 210, 309, 310) are formed substantially axially and the angle of attack (α, β) by means of the end faces (214, 215, 314, 315) are adjusted. Torsional vibration dampers (201, 301). claim 3 , characterized in that the spring units (206, 306) contain arc springs (207, 307) each with setting angles (α, β) provided on their end faces (208, 308). Torsional vibration damper (201). claim 4 , characterized in that the end faces (214, 215) forming the angle of attack (α, β) are directly accommodated on the end faces (208) of the arc springs (207). Torsional vibration damper (301). claim 4 , characterized in that spring inserts (319) forming the angles of attack (α, β) with the contact surfaces (314, 315) are formed on the end faces (308) of the arcuate springs (307). Torsional vibration damper (301). claim 6 , characterized in that the spring inserts (319) have pins (320) engaging in an interior of the windings of the arc springs (307) and their end faces (314, 315) are roof-shaped to form an angle of attack (α, β) each with a contact surface (309 , 310) of the disk part (303) and the cover part (304) are formed. Torsional vibration damper (201, 301) according to one of Claims 1 until 7 , characterized in that the stops (211, 212, 311, 321) in the disk part (203, 303) and in the cover part (204, 304) are designed as embossings with a maximum embossing angle of 3°. Torsional vibration damper (201, 301) according to one of Claims 1 until 8th , characterized in that the spring units (206, 306) are acted upon on the output side by means of a flange part (217), the radially expanded flange wings (218) of which are positioned axially between the stops (211, 212, 311, 312) and between the end faces (214 , 215, 314, 315) of the spring units (206, 306) engage. Method for producing a torsional vibration damper (201, 301) according to one of Claims 1 until 9 , characterized in that the spring units (206, 306) are introduced, prestressed in the circumferential direction, between the stops (211, 311) in the disk part (203, 303), radially expanded flange wings (218) of an output-side flange part (217) between in the circumferential direction by means end faces (214, 314) of the spring units (206, 306) spaced apart from the stops (211, 311) are inserted, then the stops (212, 312) of the cover part (204, 304) are inserted between the end faces (212, 312) facing the stops (212, 312) 215, 315) are introduced and the cover part (204, 304) is tightly connected to the disc part (203, 303) radially on the outside.

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