CN110657195A

CN110657195A - Torsional vibration damper

Info

Publication number: CN110657195A
Application number: CN201810701472.8A
Authority: CN
Inventors: 赵星
Original assignee: Nanjing Valeo Clutch Co Ltd
Current assignee: Nanjing Valeo Clutch Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2020-01-07
Anticipated expiration: 2038-06-29
Also published as: CN110657195B

Abstract

The present invention provides a torsional vibration damper, comprising: a first rotating member; a second rotating member coupled with the first rotating member such that torque is transferred from the first rotating member to the second rotating member; and a hub co-rotating with the second rotating member, wherein the hub comprises an annular disc and a sub-hub of reduced radial dimension detachably connected to the annular disc. The torsional vibration damping system according to the invention enables the crankshaft threads to be accessed during installation, and is simple in structure and convenient to install.

Description

Torsional vibration damper

Technical Field

The present invention relates to a torsional vibration damper, in particular for a motor vehicle driveline.

Background

In the transmission system of a motor vehicle, a torsional vibration damper is provided between a gear box or a clutch and an engine to isolate torsional vibration of a crankshaft of the engine, thereby reducing undesirable noise, vibration, and the like caused by vibration entering the gear box, and further improving the transmission performance of the motor vehicle.

A dual mass flywheel is an example of a torque damping system. In dual mass flywheels, such as dual clutch transmissions, the hub for transmitting torque to the output shaft is typically designed with an opening through which an operator can access a crankshaft bolt for securing the primary mass flywheel and crankshaft from one side of the secondary mass flywheel to complete the installation of the dual mass flywheel. The diameter of the crankshaft bolt relative to the axis of rotation is defined as the Pitch Center Diameter (PCD). In some cases, the PCD is small and the output shaft diameter is large (and thus the central bore of the hub is large), and therefore, openings cannot be provided in the hub to allow access through the crankshaft bolts.

Disclosure of Invention

In order to solve the problems of the prior art, it is an object of the present invention to provide a torsional vibration damper that enables the crankshaft threads to be accessed during installation, and that is simple in construction and easy to install.

One aspect of the present invention provides a torsional vibration damper including: a first rotating member; a second rotating member coupled with the first rotating member such that torque is transferred from the first rotating member to the second rotating member; and a hub co-rotating with the second rotating member, wherein the hub comprises an annular disc and a sub-hub of reduced radial dimension detachably connected to the annular disc.

Preferably, the annular disc is coupled to the sub-hub in the circumferential direction via a toothed connection.

Preferably, the torsional vibration damper further comprises a stop ring which is placed in the axial direction between a stop of the annular disk or of the second rotational member which projects radially inwards and the sub-hub, wherein the sub-hub is positioned in the axial direction on one side of the second rotational member by the stop ring.

Preferably, the torsional vibration damper further includes a drive plate disposed between the first rotational member and the second rotational member in a torque transmission path of the torsional vibration damper and fixed to the second rotational member.

Preferably, said sub-hub has a plurality of projections projecting radially outwardly, said annular disc has a plurality of recesses recessed radially outwardly, said toothed engagement being an engagement between said projections and said recesses inserted into said projections.

Preferably, the torsional vibration damper further comprises a stop ring which is placed in the axial direction between a radially inwardly projecting annular disk stop of the annular disk and the sub-hub, wherein the sub-hub is positioned in the axial direction on the side of the second rotational member by the stop ring.

Further preferably, the sub-hub is positioned in the axial direction by the second rotation member on one side of the first rotation member.

Further preferably, the sub-hub is positioned in the axial direction by the drive disc on one side of the first rotating member.

Further preferably, the annular disc stop projects radially inwardly at a portion of a side of the annular disc between the recesses, which is adjacent to the second rotational member. Preferably, the thickness of the annular disc stop is less than the thickness of the body of the annular disc.

Preferably, the torsional vibration damper further comprises a stop collar which is placed in the axial direction between the radially inwardly projecting rotary member stop of the second rotary member and the sub-hub, wherein the sub-hub is positioned in the axial direction on the side of the second rotary member by the stop collar and on the side of the first rotary member by the annular disc.

Further preferably, the rotary member stopper protrudes radially inward at a portion of the second rotary member on one side of the second rotary member. Preferably, the thickness of the rotation member stop is less than the thickness of the body of the second rotation member.

Further preferably, the sub-hub is positioned in the axial direction on one side of the first rotational member by an annular disc stopper of the annular disc, the annular disc stopper protruding radially inward at a portion of the annular disc on the side close to the first rotational member. Preferably, the thickness of the annular disc stop is less than the thickness of the body of the annular disc.

Preferably, the torsional vibration damper further includes a stopper ring including an annular body portion located at a side of the second rotational member with respect to the sub-hub and a plurality of hook portions hooking the annular disc at a side of the first rotational member, wherein the annular body portion is formed in one piece with the plurality of hook portions, and the sub-hub is positioned in an axial direction at a side of the second rotational member by the stopper ring.

Further preferably, the sub-hub is positioned in the axial direction by the drive disc on one side of the first rotation member.

Further preferably, the sub-hub is positioned in the axial direction on one side of the first rotational member by an annular disc stopper of the annular disc, the annular disc stopper protruding radially inward at a portion close to one side of the first rotational member. Preferably, the thickness of the annular disc stop is less than the thickness of the body of the annular disc.

Further preferably, the plurality of hook portions extend radially outward from the annular body portion past radially outer sides of the plurality of projections, respectively, so as to hook the annular disk.

Preferably, the annular disc is separate from both the second rotary member and the drive disc, and the annular disc is fixed to the second rotary member.

Preferably, the annular disc is formed in one piece with the second rotary member.

Preferably, the annular disc is formed in one piece with the drive disc.

Preferably, the torsional vibration damper is for a dual mass flywheel, the first rotational member being a primary mass flywheel and the second rotational member being a secondary mass flywheel.

Another aspect of the invention provides a driveline for a motor vehicle comprising a torsional vibration damper as described above.

A further aspect of the invention provides a motor vehicle comprising a transmission system as described above.

The hub of the present invention comprises two separate parts, namely a sub-hub and an annular disc, and the crankshaft bolts are accessible through openings left where the sub-hub is to be installed before the sub-hub is installed in place, so that the torsional vibration damper is easy to install. In addition, the torsional vibration damper of the invention has at least one of the advantages of simple structure, convenient processing, low cost, high strength and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a cross-sectional view of a torsional vibration damper according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a perspective view of an annular disc in the torsional vibration damper in accordance with the first embodiment of the present invention;

FIG. 4 is a perspective view of a sub-hub in the torsional vibration damper in accordance with the first embodiment of the present invention;

FIG. 5 is a perspective view of a stop ring in the torsional vibration damper according to the first embodiment of the present invention;

FIGS. 6a to 6e are views for explaining an installation process of the torsional vibration damper in accordance with the first embodiment of the present invention;

FIG. 7 is a perspective view of a torsional vibration damper in accordance with a second embodiment of the present invention;

FIG. 8 is a cross-sectional view of a torsional vibration damper in accordance with a second embodiment of the present invention; a

FIG. 9 is a cross-sectional view taken along line A-A of FIG. 8;

FIG. 10 is a perspective view of a second rotational member in the torsional vibration damper in accordance with the second embodiment of the present invention;

FIG. 11 is a perspective view of a torsional vibration damper in accordance with a third embodiment of the present invention;

FIG. 12 is a cross-sectional view of a torsional vibration damper in accordance with a third embodiment of the present invention;

FIG. 13 is a cross-sectional view taken along line A-A of FIG. 12;

14a, 14b are perspective views of a second rotary member in a torsional vibration damper according to a third embodiment of the present invention;

FIG. 15 is a perspective view of an annular disc in a torsional vibration damper in accordance with a third embodiment of the present invention;

FIG. 16 is a perspective view of a sub-hub in a torsional vibration damper according to a third embodiment of the present invention;

FIG. 17 is a cross-sectional view of a torsional vibration damper in accordance with a fourth embodiment of the present invention;

FIG. 18 is a cross-sectional view taken along line A-A of FIG. 17;

FIG. 19a is an exemplary perspective view of a drive plate in a torsional vibration damper according to a fourth embodiment of the present invention;

FIG. 19b is a perspective view of another example of a drive plate in a torsional vibration damper according to a fourth embodiment of the present invention;

FIG. 20 is a perspective view of a torsional vibration damper in accordance with a fifth embodiment of the present invention;

FIG. 21 is another perspective view of a torsional vibration damper in accordance with a fifth embodiment of the present invention;

FIG. 22 is a cross-sectional view of a torsional vibration damper in accordance with a fifth embodiment of the present invention;

FIG. 23 is a cross-sectional view taken along line A-A of FIG. 22;

FIG. 24 is a perspective view of a stop collar in a torsional vibration damper in accordance with a fifth embodiment of the present invention;

FIG. 25 is a perspective view of a torsional vibration damper in accordance with a sixth embodiment of the present invention;

FIG. 26 is another perspective view of a torsional vibration damper in accordance with a sixth embodiment of the present invention;

FIG. 27 is a cross-sectional view of a torsional vibration damper in accordance with a sixth embodiment of the present invention;

FIG. 28 is a cross-sectional view taken along line A-A of FIG. 27;

fig. 29 is a perspective view of a drive plate in a torsional vibration damper according to a fifth embodiment of the present invention.

Detailed Description

Hereinafter, a torsional vibration damper according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in conjunction with the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to their bibliographic meanings, but are used by the inventors to convey a clear and consistent understanding of the invention. Accordingly, it will be appreciated by those skilled in the art that the following descriptions of the various embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

It is to be understood that the terms "radial," "axial," "inward," "outward," and the like are used herein and in the claims to indicate an orientation or positional relationship that is merely convenient for describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be taken as limiting the invention. In general, "axial" refers to a direction parallel to the axis of rotation of the torsional vibration damper, "radial" refers to a direction normal to the axis of rotation, "radially inward" refers to a direction normal to and pointing toward the axis of rotation, and "radially outward" refers to a direction normal to and away from the axis of rotation.

It will be appreciated that in the drawings, some components have been omitted for clarity to avoid confusion.

A torsional vibration damper 100 according to a first embodiment of the present invention will be described in detail with reference to fig. 1 to 6.

Referring to fig. 1, torsional vibration damper 100 includes a first rotational member 110, a second rotational member 120, and a drive disk 130, with second rotational member 120 coupled with first rotational member 110 such that torque is transferred from first rotational member 110 to second rotational member 120. Also, the first and

second rotation members

110 and 120 may be relatively rotatable about a rotation axis. The first rotation member 110 is fixed to the crankshaft on the engine side by a plurality of crankshaft bolts 170. The first rotational member 110 receives the torque of the crankshaft and transmits the torque to the driving disk 130 through, for example, a spring damping system, a friction damping system, or the like. The drive plate 130 is disposed between the first rotational member 110 and the second rotational member 120 in the torque transmission path of the torsional vibration damper. Drive disk 130 then transmits torque to second rotational member 120.

In a conventional torsional vibration damper, an integrally formed hub is fixed to the second rotational member 120 and/or the drive disk 130 by fixing rivets 160 (or other types of fasteners such as fixing bolts) and outputs torque to an output shaft.

In the case shown in fig. 1, the diameter PCD of the crankshaft bolt 170 with respect to the rotation axis is small, while the diameter D of the output shaft is large. Therefore, it is difficult to provide an opening in the hub to allow access to the crankshaft bolt 170 through the opening. Therefore, the first rotational member 110 cannot be fixed to the crankshaft, and the installation of the torsional vibration damper 100 cannot be completed.

As shown in fig. 1, in the torsional vibration damper 100 according to the embodiment of the present invention, the hub includes an annular disk 140 and a sub-hub 150 which is detachable from the annular disk 140 and reduced in radial size. Fig. 2 is a view of a section taken along line a-a of fig. 1. As shown in fig. 2 to 4, the sub hub 150 has a plurality of protrusions 151 protruding radially outward, the annular disk 140 has a plurality of recesses 141 depressed radially outward, the plurality of protrusions 151 are respectively inserted into the plurality of recesses 141 to couple the sub hub 150 and the annular disk 140 in the circumferential direction, so that torque can be transmitted between the annular disk 140 and the sub hub 150. From another perspective, it can also be said that the sub-hub 150 has a plurality of recesses recessed radially outward, the annular disk 140 has a plurality of protrusions protruding radially outward, and the plurality of protrusions are fitted with the plurality of recesses. Further, the annular disc 140 is fixed with the second rotating member 120 and the driving disc 130 by fixing rivets 160. Accordingly, the annular disc 140 transfers the torque received from the driving disc 130 and/or the second rotating member 120 to the sub-hub 150, and further to the output shaft, which may be coupled with the sub-hub 150 via a spline.

Because the sub-hub 150 is a separate piece from the annular disc 140, the sub-hub 150 can be installed in place after the crankshaft bolts 170 are installed. The diameter of the sub-hub 150 is designed to be less than, equal to, or greater than PCD, so long as the opening left on the side of the second rotational member 120 when the sub-hub 150 is not installed allows access to the crankshaft bolt 170. The sub-hub 150 preferably has a diameter larger than the PCD.

Furthermore, there is play between the sub-hub 150 and the annular disc 140, and therefore the torsional vibration damper 100 may further comprise means for compensating for play, such as spring-loaded means or the like.

The sub-hub 150 is positioned in the axial direction. As shown in fig. 1, in this embodiment, the sub hub 150 is positioned by the stopper ring 180 at one side of the second rotation member 120 and is positioned by the second rotation member 120 at one side of the first rotation member 110. Specifically, the stop ring 180 is prevented from axially between the radially inwardly projecting annular disc stop 142 of the annular disc 140 and the sub-hub 150, and at least a portion of the second rotation member 120 extends radially inwardly beyond the sub-hub 150. The stop ring 180 may be flat. The stop ring 180 may also be inclined, that is to say it is tapered overall, and it may be resilient to avoid axial movement.

As shown in fig. 3, the annular disc stopper 142 protrudes radially inward at a portion between the recesses 141 at a side close to the second rotary member 120 in the axial direction, and the thickness of the annular disc stopper 142 is smaller than that of the main body of the annular disc 140. Accordingly, the portions between the protrusions 151 of the sub-hub 150 are inwardly depressed such that the innermost profile of the annular disc 140 is greater than or equal to the outermost profile of the sub-hub 150, so that the sub-hub 150 can be put in place from the side of the second rotating member 120 without being blocked by the annular disc 140, etc.

As shown in FIG. 5, the stop ring 180 is generally annular, sheet-like in shape with an opening to facilitate installation of the stop ring 180.

The installation process of the torsional vibration damper 100 according to the first embodiment of the present invention will be described in detail with reference to fig. 6a to 6 e.

As shown in fig. 6a, the primary mass flywheel 110 and the drive plate 130 are installed, and the primary cover is welded to the primary mass flywheel 110. As shown in fig. 6b, the secondary mass flywheel 120 is mounted on the drive plate 130. As shown in fig. 6c, 6d, the ring plate 140 is installed, and the riveting of the ring plate 140, the secondary mass flywheel 120 and the drive plate 130 is completed (by fixing rivets 160). The assembled assembly may be delivered to the customer as a mounted assembly in the step shown in fig. 6 d. As shown in fig. 6e, the mounting assembly is secured to the engine side crankshaft by crankshaft bolts 170, that is, the primary mass flywheel 110 is secured to the crankshaft by crankshaft rivets 170; the sub-hub 150 is then put in place such that its protrusion 151 is inserted into the recess 141 of the annular disc 140, wherein the sub-hub 150 is stopped by the second rotation member 120 on the side of the first rotation member 110. Finally, as shown in fig. 1, the stop ring 180 is snapped between the sub-hub 150 and the annular disc stop 142 of the annular disc 140 so that the sub-hub 150 is positioned in the axial direction. It can be seen that the crank bolt 170 can be conveniently installed before the sub-hub 150 is placed since there is no blocking of the sub-hub 150. In addition, the axial positioning of the sub-hub 150 is realized through the stop ring 180, and the structure is simple and the operation is convenient.

A torsional vibration damper 200 according to a second embodiment of the present invention will be described in detail with reference to fig. 7 to 10.

Referring to fig. 7 and 8, torsional vibration damper 200 includes a first rotational member (not shown), a second rotational member 220, a drive disk 230, and a hub. In this embodiment, the hub includes a sub-hub 250 and an annular disc. Unlike the first embodiment, the annular disc is integrally formed with the second rotational member 220, i.e. in one piece. Alternatively stated, the second rotational member 220 includes an annular disk portion 240. The second rotational member 220 and the drive disk 230 are fixed by the fixing rivet 260.

As shown in fig. 9, the sub-hub 250 has a plurality of protrusions 251 protruding radially outward, and the annular disk portion 240 has a plurality of recesses 241 depressed radially outward, the plurality of protrusions 251 being inserted into the plurality of recesses 241 to couple the sub-hub 250 and the annular disk portion 240 in the circumferential direction. Because the sub-hub 250 is separate from the annular disk portion 240, the sub-hub 250 may be installed in place after the crankshaft bolts 170 are installed. Therefore, the crank bolt 170 can be conveniently installed.

The sub-hub 250 is positioned in the axial direction. As shown in fig. 8, the sub-hub 250 is positioned by the stopper ring 280 at one side of the second rotating member 220 and by the driving disk 230 at one side of the first rotating member. Specifically, the stop ring 280 is axially positioned between the radially inwardly projecting annular disc stop 242 of the annular disc portion 240 and the sub-hub 250, and at least a portion of the drive disc 230 extends radially inwardly beyond the sub-hub 250.

As shown in fig. 10, the annular disc stopper 242 protrudes radially inward at a portion between the recesses 241 at a side close to the second rotary member 220 in the axial direction, and the thickness of the annular disc stopper 242 is smaller than that of the main body of the annular disc 240. Accordingly, as shown in fig. 9, the portions between the protrusions 251 of the sub-hub 250 are recessed inward such that the innermost profile of the annular disc part 240 is greater than or equal to the outermost profile of the sub-hub 250, so that the sub-hub 250 can be put in place from the side of the second rotation member 220 without being blocked by the annular disc part 240 and the like.

A torsional vibration damper 300 according to a third embodiment of the present invention will be described in detail with reference to fig. 11 to 16.

Referring to fig. 11 and 12, torsional vibration damper 300 includes first rotational member 310, second rotational member 320, drive disk 330, and a hub. The first rotation member 310 is fixed to the crankshaft on the engine side by a plurality of crankshaft bolts 370. In this embodiment, the hub includes a sub-hub 350 and an annular disc 340. In this embodiment, the sub-hub 350 and the annular disc 340 are separate pieces. The annular disc 340, the second rotational member 320, and the drive disc 330 are fixed by fixing rivets 360.

As shown in fig. 13, 15, 16, the sub-hub 350 has a plurality of protrusions 351, 351 'protruding radially outward, and the annular disc 340 has a plurality of recesses 341, 341' recessed radially outward, the plurality of protrusions 351, 351 'being inserted into the plurality of recesses 341, 341' to couple the sub-hub 350 and the annular disc 340 in the circumferential direction.

The sub-hub 350 is positioned in the axial direction. As shown in fig. 12, the sub-hub 350 is positioned by the stopper ring 380 at one side of the second rotating member 320 and the annular disc 340 at one side of the first rotating member 310. Specifically, the stopper ring 380 is placed between the radially inwardly protruding rotary member stopper 321 of the second rotary member 320 and the sub-hub 250 in the axial direction, and the sub-hub 350 is positioned in the axial direction by the radially inwardly protruding annular disc stopper 342 of the annular disc 340 on one side of the first rotary member.

Fig. 14a, 14b show a top perspective view and a bottom perspective view, respectively, of a second rotation member 320 according to a third embodiment of the present invention. The rotating member stopper 321 protrudes radially inward at a portion of the second rotating member 320 on a side close to the second rotating member 320, and a thickness of the rotating member stopper 321 is smaller than a thickness of the body of the second rotating member 320. Further, the second rotation member 320 is designed such that the innermost profile thereof is greater than or equal to the outermost profile of the sub-hub 350, so that the sub-hub 350 can be put in place from the side of the second rotation member 320 without being blocked by the second rotation member 320 and the like.

As shown in fig. 15, 16, the annular disc stopper 342 protrudes radially inward at a portion of the annular disc 340 on a side close to the first rotary member in the axial direction at least one recess 341 'of the plurality of recesses 341, 341', and the thickness of the annular disc stopper 342 is smaller than that of the main body of the annular disc. Accordingly, the protrusion 351 'of the sub-hub 350 corresponding to the recess 341' has a reduced thickness to reduce the thickness of the torsional vibration damper 300 in the axial direction. In other words, at least one recess 341 ' of the plurality of recesses 341, 341 ' of the annular disc 340 overlaps the corresponding protrusion 351 ' of the sub-hub 350 as seen in the axial direction, so that the sub-hub 350 is positioned by the annular disc 340 at one side of the first rotation member 310.

A torsional vibration damper 400 according to a fourth embodiment of the present invention will be described in detail with reference to fig. 17 to 19.

Referring to fig. 17, torsional vibration damper 400 includes a first rotational member (not shown), a second rotational member 420, a drive disk 430, and a hub. In this embodiment, the hub includes a sub-hub 450 and an annular disc. In this embodiment, the annular disc is integrally formed with drive disc 430. Alternatively stated, drive plate 430 includes an annular disc portion 440. Second rotating member 420 and drive disk 430 are fixed by fixing rivet 460.

As shown in fig. 18, the sub-hub 450 has a plurality of protrusions 451 protruding radially outward, and the annular disk portion 440 has a plurality of recesses 441 recessed radially outward, the plurality of protrusions 451 being inserted into the plurality of recesses 441 to couple the sub-hub 450 and the annular disk portion 440 in the circumferential direction.

The sub-hub 450 is positioned in the axial direction. As shown in fig. 17, the sub-hub 450 is positioned by the stopper ring 480 at one side of the second rotating member 420 and by the annular disk portion 440 at one side of the first rotating member. Specifically, the stopper ring 480 is placed between the radially inwardly protruding rotary member stopper 421 of the second rotary member 420 and the sub-hub 450 in the axial direction, and the sub-hub 450 is positioned in the axial direction by the radially inwardly protruding annular disk stopper 442 of the annular disk portion 440 on one side of the first rotary member.

Similar to the third embodiment, the rotation member stopper 421 protrudes radially inward at a portion of the second rotation member 420 at a side close to the second rotation member, and the thickness of the rotation member stopper 421 is smaller than that of the main body of the second rotation member 420. Further, the second rotating member 420 is designed such that the innermost profile thereof is greater than or equal to the outermost profile of the sub-hub 450, so that the sub-hub 450 can be put in place from one side of the second rotating member 420 without being blocked by the second rotating member 420 and the like.

Fig. 19a, 19b show two examples of driving discs 430, 430' according to a fourth embodiment of the invention, respectively. In both examples, the annular disc stops 442, 442' overlap at least a portion of the sub-hub 350 as viewed in the axial direction such that the sub-hub 450 is positioned by the annular disc portion 440 on one side of the first rotational member 410. As shown in fig. 19a, in one example, the annular disc stopper 442 protrudes radially inward at a portion on a side close to the first rotating member in the axial direction between the adjacent two recesses 441, and the thickness of the annular disc stopper 442 is smaller than that of the main body of the annular disc. As shown in fig. 19b, in another example, the annular disc stopper 442 'protrudes radially inward at a portion of at least one recess 441' of the plurality of recesses 441, 441 'that is close to a side of the first rotating member in the axial direction, and the thickness of the annular disc stopper 442' is smaller than that of the main body of the annular disc portion 440.

A torsional vibration damper 500 according to a fifth embodiment of the present invention will be described in detail with reference to fig. 20 to 24.

Referring to fig. 20-22, torsional vibration damper 500 includes a first rotational member (not shown), a second rotational member 520, a drive disk 530, and a hub. In this embodiment, the hub includes a sub-hub 550 and an annular disc. The annular disc is integrally formed with the second rotary member 520. Alternatively stated, the second rotating member 520 includes an annular disk portion 540. The second rotation member 520 and the drive disk 530 are fixed by the fixing rivet 560.

As shown in fig. 23, the sub-hub 550 has a plurality of protrusions 551 protruding radially outward, and the annular disk portion 540 has a plurality of recesses 541 recessed radially outward, the plurality of protrusions 551 being inserted into the plurality of recesses 541 to couple the sub-hub 550 and the annular disk portion 540 in the circumferential direction.

The sub-hub 550 is positioned in the axial direction. As shown in fig. 20-22, the sub-hub 550 is positioned by the stop ring 580 on one side of the second rotational member 520 and by the drive disc 530 on one side of the first rotational member. Specifically, at least a portion of the drive disc 530 extends radially inward beyond the sub-hub 550. And, specifically, as shown in fig. 22 to 24, the stop ring 580 includes a ring-shaped body part 581 located at one side of the second rotating member 520 of the sub-hub 550 and a plurality of hook parts 582 hooked on the ring-shaped plate part 540 at one side of the first rotating member, the ring-shaped body part 581 being integrally formed with the plurality of hook parts 582, but is not limited thereto. The sub-hub 550 is positioned in the axial direction at one side of the second rotation member 520 by the stopper ring 580. Due to such a configuration of the stop ring 580, a stopper having a smaller thickness and thus a lower strength may be avoided at the second rotation member, the annular disc, to enhance the strength of the second rotation member, the annular disc.

As shown in fig. 23, there is a clearance in the radial direction between the projection 551 of the sub-hub 550 and the corresponding recess 541 of the annular disk portion 540. The plurality of hook portions 580 extend radially outward from the ring-shaped body portion 581 past the radially outer sides of the plurality of projections 551, respectively, and hook the annular disk portion 540 on one side of the first rotating member through the gap. In other examples, the plurality of hook portions 580 may also extend to one side of the first rotating member at other locations to hook the annular disk portion 540.

A torsional vibration damper 600 according to a sixth embodiment of the present invention will be described in detail with reference to fig. 25 to 29.

Referring to fig. 25-27, torsional vibration damper 600 includes a first rotational member (not shown), a second rotational member 620, a drive plate 630, and a hub. In this embodiment, the hub includes a sub-hub 650 and an annular disc. The annular disc is integrally formed with drive disc 630. Alternatively stated, drive disk 630 includes an annular disk portion 640. The second rotation member 620 and the driving disk 630 are fixed by fixing rivets 660.

As shown in fig. 28, the sub-hub 650 has a plurality of protrusions 651 protruding radially outward, and the annular disk portion 640 has a plurality of recesses 641 recessed radially outward, the plurality of protrusions 651 being inserted into the plurality of recesses 641 to couple the sub-hub 650 and the annular disk portion 640 in the circumferential direction.

The sub-hub 650 is positioned in the axial direction. As shown in fig. 25-27, the sub-hub 650 is positioned by the stop ring 680 on one side of the second rotational member 620 and by the annular disk portion 640 on one side of the first rotational member.

Specifically, similar to the fifth embodiment, the stopper ring 680 includes a ring-shaped body portion 681 positioned at one side of the second rotation member 620 of the sub-hub 650 and a plurality of hook portions 682 hooking the annular disc portion 640 at one side of the first rotation member, the ring-shaped body portion 681 being integrally formed with the plurality of hook portions 682. The sub-hub 650 is positioned in the axial direction at one side of the second rotation member 620 by the stopper ring 680. More specifically, as shown in fig. 28, there is a gap in the radial direction between the projection 651 of the sub-hub 650 and the corresponding recess 541 of the annular disk portion 640. The plurality of hook portions 680 extend radially outward from the annular body portion 681 past the radially outer sides of the plurality of projections 651, respectively, and hook the annular disk portion 640 on one side of the first rotating member through the gap.

In particular, the sub-hub 650 is positioned on one side of the first rotational member by a radially inwardly projecting annular disc stop 642 of the annular disc portion 640. As shown in fig. 29, the ring disc stoppers 642 protrude radially inward at a portion on the side close to the first rotary member in the axial direction between the adjacent at least one pair of recesses 641, and the thickness of the ring disc stoppers 642 is smaller than that of the main body of the ring disc portion 640.

It will be appreciated that the above-described features, structures, or characteristics may be combined in any suitable manner in embodiments other than those illustrated.

It is noted that in the above described embodiments, the first and second rotating members are the primary and secondary mass flywheels, respectively, of a dual mass flywheel. In other embodiments, the first and second rotational members may be included in other types of torsional vibration damping systems.

The scope of the present invention is defined not by the above-described embodiments but by the appended claims and equivalents thereof.

List of reference numerals

Torsional vibration damper

100, 200, 300, 400, 500, 600

First rotation member 110, 310

Second rotating

member

120, 220, 320, 420, 520, 620

Rotating member stopper portions 321 and 421

Driving

discs

130, 230, 330, 430', 530, 630

Annular discs

140, 340

Annular disk portions

240, 440, 540, 640

Recesses

141, 241, 341 ', 441', 541, 641

Annular disc stops 142, 242, 342, 442', 642

Sub-hubs

150, 250, 350, 450, 550, 650

Projections

151, 251, 351', 451, 551, 651

Set rivets 160, 260, 360, 460, 560, 660

Crankshaft bolt 170, 370

Stop rings 180, 280, 380, 480, 580, 680

Annular body portions

581, 681

Hook portions

582, 682.

Claims

1. A torsional vibration damper comprising:

a first rotating member;

a second rotating member coupled with the first rotating member such that torque is transferred from the first rotating member to the second rotating member; and

a hub rotating together with the second rotating member, wherein

The hub includes an annular disc and a sub-hub having a reduced radial dimension removably connected to the annular disc.

2. The torsional vibration damper of claim 1,

the annular disc is coupled to the sub-hub in a circumferential direction via a toothed connection.

3. The torsional vibration damper of claim 2, further comprising

A stop ring placed in an axial direction between a stopper portion of the annular disc or the second rotary member that protrudes radially inward and the sub-hub, wherein,

the sub-hub is positioned in the axial direction on one side of the second rotation member by the stopper ring.

4. The torsional vibration damper of claim 2, further comprising

A drive plate disposed between the first rotational member and the second rotational member in a torque transmission path of the torsional vibration damper and fixed to the second rotational member.

5. The torsional vibration damper of claim 4,

the sub-hub has a plurality of projections projecting radially outward, the annular disc has a plurality of recesses recessed radially outward, and the toothed engagement is engagement between the projections and the recesses inserted into the projections.

6. The torsional vibration damper of claim 5, further comprising

A stop ring placed in an axial direction between a radially inwardly projecting annular disc stop of the annular disc and the sub-hub, wherein,

7. The torsional vibration damper of claim 6, wherein

The sub-hub is positioned in an axial direction by the second rotation member on one side of the first rotation member.

8. The torsional vibration damper of claim 6, wherein

The sub-hub is positioned in the axial direction by the drive disc on one side of the first rotational member.

9. The torsional vibration damper of claim 6, wherein

The annular disc stop projects radially inwardly at a portion between the recesses of the annular disc near a side of the second rotary member.

10. The torsional vibration damper of claim 5, further comprising

A stop ring placed in an axial direction between a radially inwardly projecting rotary member stop of the second rotary member and the sub-hub, wherein,

the sub-hub is positioned in the axial direction by the stopper ring on the side of the second rotation member, and is positioned in the axial direction by the annular disk on the side of the first rotation member.

11. The torsional vibration damper of claim 10, wherein

The rotating member stopper protrudes radially inward at a portion of the second rotating member on a side of the second rotating member.

12. The torsional vibration damper of claim 10, wherein

The sub-hub is positioned in the axial direction on one side of the first rotational member by an annular disc stopper of the annular disc, which projects radially inward at a portion of the annular disc on the side close to the first rotational member.

13. The torsional vibration damper of claim 5, further comprising

A stopper ring including an annular body portion located at one side of the second rotation member with respect to the sub-hub and a plurality of hook portions hooking the annular disc at one side of the first rotation member, wherein,

the annular body portion is formed in one piece with the plurality of hook portions, and

14. The torsional vibration damper of claim 13, wherein

15. The torsional vibration damper of claim 13, wherein

The sub-hub is positioned in the axial direction on one side of the first rotary member by an annular disc stopper of the annular disc, which projects radially inward at a portion close to one side of the first rotary member.

16. The torsional vibration damper of claim 13, wherein

The plurality of hook portions extend radially outward from the annular body portion past a radially outer side of the plurality of projections, respectively, to hook the annular disc.

17. The torsional vibration damper according to any of claims 4-16,

the annular disc is separate from both the second rotating member and the drive disc, and the annular disc is fixedly connected to the second rotating member.

18. The torsional vibration damper of any of claims 4-6, 9, 13-16,

the annular disc is formed in one piece with the second rotary member.

19. The torsional vibration damper as defined in any of claims 4-7, 9-13, 15-16,

wherein the content of the first and second substances,

the annular disc is formed in one piece with the drive disc.

20. The torsional vibration damper according to any of claims 1-16,

the torsional vibration damper is used for a dual mass flywheel, the first rotating member is a primary mass flywheel, and the second rotating member is a secondary mass flywheel.

21. A transmission system for a motor vehicle comprising

The torsional vibration damper as defined in any of claims 1-20.

22. A motor vehicle comprises

A transmission system according to claim 21.