Cover part and torsional vibration damper

Abstract

Cover part (110) for an inlet part (102) of a torsional vibration damper (100), the cover part (110) comprising a weld joint section (116) for a through-weld connection (118) with a flange part (108) of the inlet part (102), the weld joint section (116) comprising a butt side (120) and a back side (122), wherein the weld joint section (116) has a degassing groove (126) on the butt side (120) and wherein the cover part (110) has a centering section (130) for the flange part (108) serving for radial contact of the flange part (108), characterized in that the weld joint section (116) has an electrode groove (128) on the back side (122), wherein the cover part (110) has a reduced material thickness between the degassing groove (126) and the electrode groove and that the degassing groove (126) and the electrode groove (128) are arranged opposite each other in an axial direction.

Description

[0001] The invention relates to a cover part for an inlet part of a torsional vibration damper, the cover part comprising a welded joint section for a through-weld connection with a flange part of the inlet part, the welded joint section comprising a butt side and a rear side. The invention further relates to a torsional vibration damper comprising an inlet part and an outlet part with a common axis of rotation about which the inlet part and the outlet part are rotatable together and can be rotated relative to each other within limits, the inlet part comprising an inlet flange part.

[0002] Document DE 10 2012 217 216 A1 relates to a clutch assembly for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission, comprising a dual-mass flywheel connectable to the drive shaft for torsional vibration damping, and a clutch connectable to at least one transmission input shaft. The dual-mass flywheel has a primary mass that is essentially L-shaped in cross-section. A cover is welded to the primary mass, and the cover is sealed at its radially inner end by a sealing device. This seals a space between the primary mass and the cover, in which a greased arc spring can be installed.

[0003] Document DE 10 2014 220 731 A1 relates to a dual-mass flywheel for damping torsional vibrations in a motor vehicle drivetrain, comprising a primary body forming a receiving channel for introducing or dissipating torque. The primary body, by means of a flywheel and a cover welded to the flywheel, defines a receiving channel in which an energy storage element designed as an arc spring is arranged.

[0004] In the dual-mass flywheels published in document DE 10 2012 217 216 A1, the cover part of the input part is connected to the primary side by a welded connection.

[0005] From DE 10 2015 218 951 A1, degassing channels are known for gear welded joints, which extend to the weld root of the weld or which lead away from the weld root of the weld joint.

[0006] The invention is based on the objective of improving the structure and / or function of a aforementioned cover part. Furthermore, the invention is based on the objective of improving the structure and / or function of a aforementioned torsional vibration damper.

[0007] The problem is solved by a lid part having the features of claim 1. Furthermore, the problem is solved by a torsional vibration damper having the features of claim 5. Advantageous embodiments and further developments are the subject of the dependent claims.

[0008] According to the invention, the weld joint section has an electrode groove on the rear side, the cover part between the degassing groove and the electrode groove has a reduced material thickness, and the degassing groove and the electrode groove are arranged opposite each other in the axial direction.

[0009] The cover section can have a shell-shaped cross-section. The weld joint section can be located radially outside the cover section. The weld joint section can extend at least approximately in the radial direction. The joint face can face an inlet flange section if the cover section is welded to an inlet flange section. The joint face of the weld joint section can serve for the axial bearing of the flange section. The joint face can have an axially directed bearing plane. The bearing plane can have an annular bearing surface. The degassing groove can be located in the bearing surface. The degassing groove can be located at least approximately centrally in the radial direction of the bearing surface. The degassing groove can have an area in the bearing plane that corresponds at least approximately to the bearing surface.The degassing groove can have a groove width that is a multiple of its groove depth, with the groove width extending radially and the groove depth axially. The degassing groove can be radially circumferential. The degassing groove can be radially continuous. The degassing groove can be radially interrupted.

[0010] The degassing groove can serve to absorb gases during welding. The degassing groove can be removed during welding. The degassing groove can be produced by a forming process. The cover part can be produced by a forming process. The cover part with the degassing groove can be produced by die casting in a forming process.

[0011] The rear side can face away from an inlet flange part if the cover part is welded to an inlet flange part. The electrode groove serves to provide electrode access during welding. The electrode groove can be radially circumferential. The electrode groove can be radially continuous. The electrode groove can be radially interrupted. The degassing groove and the electrode groove are arranged opposite each other in the axial direction. The cover part has a reduced material thickness between the degassing groove and the electrode groove.

[0012] The cover part can have a centering section for the flange part. The centering section can serve for the radial positioning of the flange part. The centering section can be radially circumferential. The centering section can be radially continuous. The centering section can be radially interrupted. The centering section can be manufactured using a forming process. The centering section can be designed as a through-hole. The cover part with the centering section can be manufactured using a forming process with a tool drop.

[0013] The torsional vibration damper can be installed in a drivetrain. It can be designed as a dual-mass flywheel. The torsional vibration damper can be installed between a vehicle's engine and a friction clutch assembly. The vehicle's engine can be an internal combustion engine. The internal combustion engine can have a crankshaft. The torsional vibration damper can be installed on the crankshaft. The torsional vibration damper can be installed on the friction clutch assembly. The torsional vibration damper can be installed on a hydrodynamic torque converter. The torsional vibration damper can be installed on a transmission. The torsional vibration damper can be installed on an auxiliary drive unit.

[0014] The terms "input section" and "output section" refer specifically to the direction of flow from a vehicle propulsion motor. Unless otherwise specified or evident from the context, the terms "axial," "radial," and "circumferential" refer to the direction of extension of the axis of rotation. "Axial" then corresponds to the direction of extension of the axis of rotation. "Radial" is a direction perpendicular to and intersecting the direction of extension of the axis of rotation. "Circular" then corresponds to a circular arc direction around the axis of rotation.

[0015] The inlet flange part can also be referred to as the flange part of the inlet part. The inlet flange part can have a shell-shaped cross-section. The inlet flange part can have a bottom section and a wall section. The bottom section can extend at least substantially in the radial direction. The wall section can extend at least substantially in the axial direction. The wall section can extend from the bottom section to the top section of the inlet part. The inlet flange part and the top section can define a receiving space. The receiving space can have an arc-channel shape.

[0016] The inlet section may have support sections projecting into the receiving space. The outlet section may be arranged axially between the bottom section of the inlet flange section and the cover section. The outlet section may also have support sections projecting into the receiving space.

[0017] A spring-damper device can be effective between the input part and the output part. The spring-damper device can have at least one mechanical energy storage device. The at least one mechanical energy storage device can be designed as a spring. The spring can be a helical spring. The spring can be a compression spring. The spring can be a bow spring. The at least one mechanical energy storage device can be effective between a support section of the input part and a support section of the output part. The at least one mechanical energy storage device can be supported on one side by a support section of the input part and on the other side by a support section of the output part. The at least one mechanical energy storage device can be arranged in the receiving space. The spring-damper device can have a friction device. The friction device can have at least one friction ring.

[0018] The torsional vibration damper may have a bearing arrangement for the mutual support of the input and output parts. The bearing arrangement may include at least one plain bearing. The bearing arrangement may include at least one rolling bearing. The torsional vibration damper may have a diaphragm part. The diaphragm part may be part of the friction device. The diaphragm part may serve to seal the receiving chamber.

[0019] The through-weld can be a weld extending axially through the cover part. The through-weld can have a weld root. The weld root can penetrate the degassing groove. The degassing groove can absorb gases during welding. The degassing groove can be disintegrated during welding. The electrode groove of the weld joint section can be at least partially filled with weld metal from the through-weld. The through-weld can have a weld surface. The weld surface can be located within the electrode groove. The weld surface can close off the electrode groove.

[0020] In summary, and in other words, the invention provides, among other things, a dual-mass flywheel with a degassing groove on a cover instead of on a primary flywheel. The degassing groove can be relocated from a primary flywheel to a cover.

[0021] The invention improves the welded connection between a cover part and an inlet flange part. This reduces effort, such as manufacturing effort, time, and / or costs. A degassing groove on the inlet flange part can be eliminated. Machining a degassing groove is thus avoided.

[0022] An embodiment of the invention is described in more detail below with reference to the figures. Further features and advantages will become apparent from this description. Specific features of this embodiment may represent general features of the invention. Features of this embodiment combined with other features may also represent individual features of the invention.

[0023] They show schematically and by example: Fig. 1 a dual-mass flywheel with an input flange part and a cover part and Fig. 2 A detailed view of a weld joint section of a lid part.

[0024] Fig. Figure 1 shows a torsional vibration damper 100 designed as a dual-mass flywheel with an input part 102 and an output part 104. The input part 102 and the output part 104 are rotatable together about a common axis of rotation 106 and are rotatable relative to each other within a limited range. A spring-damper assembly is active between the input part 102 and the output part 104. The torsional vibration damper 100 is used for installation in the drivetrain of a vehicle to dampen rotational irregularities in the drivetrain, particularly those caused by an internal combustion engine.

[0025] The inlet part 102 comprises an inlet flange part 108 and a cover part 110. The inlet flange part 108 has a shell-shaped cross-section with a bottom section 112 extending in the radial direction and a wall section 114 extending in the axial direction. The wall section 114 extends from the bottom section 112 to the cover part 110. The cover part 110 has a shell-shaped cross-section with a weld joint section 116 arranged radially outside the cover part 110.

[0026] The weld joint section 116 of the cover part 110 and the inlet flange part 108 are connected to each other by means of a through weld connection 118. Fig. Figure 2 shows a detailed view of the weld joint section 116 of the cover part 110 before the welding connection 118 was made.

[0027] The weld joint section 116 has a butt side 120 facing the inlet flange part 108 and a rear side 122 facing away from the inlet flange part 108 and extends in a radial direction.

[0028] The butt face 120 of the weld joint section 116 serves for the axial contact of the inlet flange part 108 and has an axially directed contact plane with an annular contact surface 124 and a degassing groove 126. The degassing groove 126 serves to absorb gases during the formation of the weld joint 118 and is dissolved during the welding process.

[0029] The weld joint section 116 has an electrode groove 128 on its rear side 122, which serves to provide access to the electrode during the welding process 118. The degassing groove 126 and the electrode groove 128 are arranged opposite each other in the axial direction. The cover part 110 has a reduced material thickness between the degassing groove 126 and the electrode groove 128.

[0030] The cover part 110 has a centering section 130 for the inlet flange part 108, which serves for the radial contact of the inlet flange part 108. The cover part with the degassing groove 126, the electrode groove 128 and the centering section 130 is manufactured using a stamping-forming process.

[0031] The inlet flange part 108 and the cover part 110 define an arc-shaped receiving chamber 132. The inlet part 102 and the outlet part 104 each have support sections projecting into the receiving chamber 132. A spring-damper assembly with arc springs 134 is active between the inlet part 108 and the outlet part 110. The arc springs 134 are arranged in the receiving chamber 132 and are supported on one side by the support sections of the inlet part 102 and on the other side by the support sections of the outlet part 104.

[0032] The torsional vibration damper 100 has a bearing arrangement 136 for the mutual support of the inlet part 102 and the outlet part 104. The torsional vibration damper 100 has a diaphragm part 138 which serves to seal the receiving chamber 132. Reference symbol list 100 torsional vibration dampers 102 Entrance section 104 Initial section 106 Rotation axis 108 Inlet flange part 110 lid part 112 Ground section 114 Wall section 116 Weld section 118 Through-weld joint 120 butt side 122 reverse 124 square meters of installation area 126 Degassing groove 128 Electrode slots 130 Centering section 132 Recording Room 134 Bowstring 136 Storage facility 138 Membrane part

Claims

[1] Cover part (110) for an inlet part (102) of a torsional vibration damper (100), the cover part (110) having a weld joint section (116) for a through-weld connection (118) with a flange part (108) of the inlet part (102), the weld joint section (116) having a butt side (120) and a rear side (122), wherein the weld joint section (116) has a degassing groove (126) on the butt side (120) and wherein the cover part (110) has a centering section (130) for the flange part (108) serving for radial contact of the flange part (108), characterized by , that the weld joint section (116) has an electrode groove (128) on the rear side (122), wherein the cover part (110) has a reduced material thickness between the degassing groove (126) and the electrode groove, and that the degassing groove (126) and the electrode groove (128) are arranged opposite each other in the axial direction. [2] Lid part (110) according to claim 1, characterized by, that the degassing groove (126) is produced in a forming process. [3] Lid part (110) according to at least one of the preceding claims, characterized by , that the butt side (120) of the weld joint section (116) serves for the axial support of the flange part (108). [4] Lid part (110) according to at least one of claims 1 to 3, characterized by , that the centering section (130) is designed as a through-pass. [5] Torsional vibration damper (100) comprising an input part (102) and an output part (104) with a common axis of rotation (106) about which the input part (102) and the output part (104) are rotatable together and can be rotated to a limited extent relative to each other, the input part (102) comprising an input flange part (108), characterized bythat the inlet part (102) has a cover part (110) according to at least one of the preceding claims, wherein the weld joint section (116) of the cover part (110) and the inlet flange part (108) are connected to each other by means of a through weld connection (118).

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